o1 "developer" role support and reasoning effort

This reverts commit ffcaa23511.

.env.example

@@ -8,6 +8,9 @@
 # Use production mode unless you are developing locally.
 NODE_ENV=production
 
+# Detail level of diagnostic logging. (trace | debug | info | warn | error)
+# LOG_LEVEL=info
+
 # ------------------------------------------------------------------------------
 # General settings:
 
@@ -24,55 +27,91 @@ NODE_ENV=production
 
 # Max number of context tokens a user can request at once.
 # Increase this if your proxy allow GPT 32k or 128k context
-# MAX_CONTEXT_TOKENS_OPENAI=16384
+# MAX_CONTEXT_TOKENS_OPENAI=32768
+# MAX_CONTEXT_TOKENS_ANTHROPIC=32768
 
 # Max number of output tokens a user can request at once.
-# MAX_OUTPUT_TOKENS_OPENAI=400
-# MAX_OUTPUT_TOKENS_ANTHROPIC=400
+# MAX_OUTPUT_TOKENS_OPENAI=1024
+# MAX_OUTPUT_TOKENS_ANTHROPIC=1024
 
 # Whether to show the estimated cost of consumed tokens on the info page.
 # SHOW_TOKEN_COSTS=false
 
 # Whether to automatically check API keys for validity.
-# Note: CHECK_KEYS is disabled by default in local development mode, but enabled
-# by default in production mode.
+# Disabled by default in local development mode, but enabled in production.
 # CHECK_KEYS=true
 
 # Which model types users are allowed to access.
 # The following model families are recognized:
-# turbo | gpt4 | gpt4-32k | gpt4-turbo | dall-e | claude | claude-opus | gemini-pro | mistral-tiny | mistral-small | mistral-medium | mistral-large | aws-claude | azure-turbo | azure-gpt4 | azure-gpt4-32k | azure-gpt4-turbo | azure-dall-e
-# By default, all models are allowed except for 'dall-e' / 'azure-dall-e'.
+# turbo | gpt4 | gpt4-32k | gpt4-turbo | gpt4o | o1 | dall-e | claude
+# | claude-opus | gemini-flash | gemini-pro | gemini-ultra | mistral-tiny |
+# | mistral-small | mistral-medium | mistral-large | aws-claude |
+# | aws-claude-opus | gcp-claude | gcp-claude-opus | azure-turbo | azure-gpt4
+# | azure-gpt4-32k | azure-gpt4-turbo | azure-gpt4o | azure-o1 | azure-dall-e
+
+# By default, all models are allowed except for dall-e and o1.
 # To allow DALL-E image generation, uncomment the line below and add 'dall-e' or
 # 'azure-dall-e' to the list of allowed model families.
-# ALLOWED_MODEL_FAMILIES=turbo,gpt4,gpt4-32k,gpt4-turbo,claude,claude-opus,gemini-pro,mistral-tiny,mistral-small,mistral-medium,mistral-large,aws-claude,azure-turbo,azure-gpt4,azure-gpt4-32k,azure-gpt4-turbo
+# ALLOWED_MODEL_FAMILIES=turbo,gpt4,gpt4-32k,gpt4-turbo,gpt4o,claude,claude-opus,gemini-flash,gemini-pro,gemini-ultra,mistral-tiny,mistral-small,mistral-medium,mistral-large,aws-claude,aws-claude-opus,gcp-claude,gcp-claude-opus,azure-turbo,azure-gpt4,azure-gpt4-32k,azure-gpt4-turbo,azure-gpt4o
 
+# Which services can be used to process prompts containing images via multimodal
+# models. The following services are recognized:
+# openai | anthropic | aws | gcp | azure | google-ai | mistral-ai
+# Do not enable this feature unless all users are trusted, as you will be liable
+# for any user-submitted images containing illegal content.
+# By default, no image services are allowed and image prompts are rejected.
+# ALLOWED_VISION_SERVICES=
+
+# Whether prompts should be logged to Google Sheets.
+# Requires additional setup. See `docs/google-sheets.md` for more information.
+# PROMPT_LOGGING=false
+
+# Specifies the number of proxies or load balancers in front of the server.
+# For Cloudflare or Hugging Face deployments, the default of 1 is correct.
+# For any other deployments, please see config.ts as the correct configuration
+# depends on your setup. Misconfiguring this value can result in problems
+# accurately tracking IP addresses and enforcing rate limits.
+# TRUSTED_PROXIES=1
+
+# Whether cookies should be set without the Secure flag, for hosts that don't
+# support SSL. True by default in development, false in production.
+# USE_INSECURE_COOKIES=false
+
+# Reorganizes requests in the queue according to their token count, placing
+# larger prompts further back. The penalty is determined by (promptTokens *
+# TOKENS_PUNISHMENT_FACTOR). A value of 1.0 adds one second per 1000 tokens.
+# When there is no queue or it is very short, the effect is negligible (this
+# setting only reorders the queue, it does not artificially delay requests).
+# TOKENS_PUNISHMENT_FACTOR=0.0
+
+# Captcha verification settings. Refer to docs/pow-captcha.md for guidance.
+# CAPTCHA_MODE=none
+# POW_TOKEN_HOURS=24
+# POW_TOKEN_MAX_IPS=2
+# POW_DIFFICULTY_LEVEL=low
+# POW_CHALLENGE_TIMEOUT=30
+
+# -------------------------------------------------------------------------------
+# Blocking settings:
+# Allows blocking requests depending on content, referers, or IP addresses.
+# This is a convenience feature; if you need more robust functionality it is
+# highly recommended to put this application behind nginx or Cloudflare, as they
+# will have better performance.
+
+# IP addresses or CIDR blocks from which requests will be blocked.
+# IP_BLACKLIST=10.0.0.1/24
 # URLs from which requests will be blocked.
 # BLOCKED_ORIGINS=reddit.com,9gag.com
 # Message to show when requests are blocked.
 # BLOCK_MESSAGE="You must be over the age of majority in your country to use this service."
 # Destination to redirect blocked requests to.
 # BLOCK_REDIRECT="https://roblox.com/"
-
-# Comma-separated list of phrases that will be rejected. Only whole words are matched.
-# Surround phrases with quotes if they contain commas.
-# Avoid short or common phrases as this tests the entire prompt.
+# Comma-separated list of phrases that will be rejected. Surround phrases with
+# quotes if they contain commas. You can use regular expression tokens.
+# Avoid overly broad phrases as will trigger on any match in the entire prompt.
 # REJECT_PHRASES="phrase one,phrase two,"phrase three, which has a comma",phrase four"
 # Message to show when requests are rejected.
-# REJECT_MESSAGE="This content violates /aicg/'s acceptable use policy."
-
-# Whether prompts should be logged to Google Sheets.
-# Requires additional setup. See `docs/google-sheets.md` for more information.
-# PROMPT_LOGGING=false
-
-# The port and network interface to listen on.
-# PORT=7860
-# BIND_ADDRESS=0.0.0.0
-
-# Whether cookies should be set without the Secure flag, for hosts that don't support SSL.
-# USE_INSECURE_COOKIES=false
-
-# Detail level of logging. (trace | debug | info | warn | error)
-# LOG_LEVEL=info
+# REJECT_MESSAGE="You can't say that here."
 
 # ------------------------------------------------------------------------------
 # Optional settings for user management, access control, and quota enforcement:
@@ -93,29 +132,34 @@ NODE_ENV=production
 # ALLOW_NICKNAME_CHANGES=true
 
 # Default token quotas for each model family. (0 for unlimited)
-# DALL-E "tokens" are counted at a rate of 100000 tokens per US$1.00 generated,
-# which is similar to the cost of GPT-4 Turbo.
+# Specify as TOKEN_QUOTA_MODEL_FAMILY=value (replacing dashes with underscores).
+# eg. TOKEN_QUOTA_TURBO=0, TOKEN_QUOTA_GPT4=1000000, TOKEN_QUOTA_GPT4_32K=100000
+# "Tokens" for image-generation models are counted at a rate of 100000 tokens
+# per US$1.00 generated, which is similar to the cost of GPT-4 Turbo.
 # DALL-E 3 costs around US$0.10 per image (10000 tokens).
 # See `docs/dall-e-configuration.md` for more information.
-# TOKEN_QUOTA_TURBO=0
-# TOKEN_QUOTA_GPT4=0
-# TOKEN_QUOTA_GPT4_32K=0
-# TOKEN_QUOTA_GPT4_TURBO=0
 # TOKEN_QUOTA_DALL_E=0
-# TOKEN_QUOTA_CLAUDE=0
-# TOKEN_QUOTA_GEMINI_PRO=0
-# TOKEN_QUOTA_AWS_CLAUDE=0
 
 # How often to refresh token quotas. (hourly | daily)
 # Leave unset to never automatically refresh quotas.
 # QUOTA_REFRESH_PERIOD=daily
 
-# Specifies the number of proxies or load balancers in front of the server.
-# For Cloudflare or Hugging Face deployments, the default of 1 is correct.
-# For any other deployments, please see config.ts as the correct configuration
-# depends on your setup. Misconfiguring this value can result in problems
-# accurately tracking IP addresses and enforcing rate limits.
-# TRUSTED_PROXIES=1
+# -------------------------------------------------------------------------------
+# HTTP agent settings:
+# If you need to change how the proxy makes requests to other servers, such
+# as when checking keys or forwarding users' requests to external services,
+# you can configure an alternative HTTP agent. Otherwise the default OS settings
+# will be used.
+
+# The name of the network interface to use. The first external IPv4 address
+# belonging to this interface will be used for outgoing requests.
+# HTTP_AGENT_INTERFACE=enp0s3
+
+# The URL of a proxy server to use. Supports SOCKS4, SOCKS5, HTTP, and HTTPS.
+# Note that if your proxy server issues a self-signed certificate, you may need
+# NODE_EXTRA_CA_CERTS set to the path to your certificate. You will need to set
+# that variable in your environment, not in this file.
+# HTTP_AGENT_PROXY_URL=http://test:test@127.0.0.1:8000
 
 # ------------------------------------------------------------------------------
 # Secrets and keys:
@@ -124,18 +168,24 @@ NODE_ENV=production
 
 # You can add multiple API keys by separating them with a comma.
 # For AWS credentials, separate the access key ID, secret key, and region with a colon.
+# For GCP credentials, separate the project ID, client email, region, and private key with a colon.
 OPENAI_KEY=sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 ANTHROPIC_KEY=sk-ant-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+GOOGLE_AI_KEY=AIzaxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 # See `docs/aws-configuration.md` for more information, there may be additional steps required to set up AWS.
 AWS_CREDENTIALS=myaccesskeyid:mysecretkey:us-east-1,anotheraccesskeyid:anothersecretkey:us-west-2
 # See `docs/azure-configuration.md` for more information, there may be additional steps required to set up Azure.
 AZURE_CREDENTIALS=azure-resource-name:deployment-id:api-key,another-azure-resource-name:another-deployment-id:another-api-key
+GCP_CREDENTIALS=project-id:client-email:region:private-key
 
 # With proxy_key gatekeeper, the password users must provide to access the API.
 # PROXY_KEY=your-secret-key
 
 # With user_token gatekeeper, the admin password used to manage users.
 # ADMIN_KEY=your-very-secret-key
+# Restrict access to the admin interface to specific IP addresses, specified
+# as a comma-separated list of CIDR ranges.
+# ADMIN_WHITELIST=0.0.0.0/0
 
 # With firebase_rtdb gatekeeper storage, the Firebase project credentials.
 # FIREBASE_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

.prettierrc

@@ -1,11 +1,10 @@
 {
+  "plugins": ["prettier-plugin-ejs"],
   "overrides": [
     {
-      "files": [
-        "*.ejs"
-      ],
+      "files": "*.ejs",
       "options": {
-        "printWidth": 160,
+        "printWidth": 120,
         "bracketSameLine": true
       }
     }

README.md

@@ -1,16 +1,20 @@
 # OAI Reverse Proxy
-
 Reverse proxy server for various LLM APIs.
 
 ### Table of Contents
-- [What is this?](#what-is-this)
-- [Features](#features)
-- [Usage Instructions](#usage-instructions)
-  - [Self-hosting](#self-hosting)
-  - [Alternatives](#alternatives)
-    - [Huggingface (outdated, not advised)](#huggingface-outdated-not-advised)
-    - [Render (outdated, not advised)](#render-outdated-not-advised)
-- [Local Development](#local-development)
+<!-- TOC -->
+* [OAI Reverse Proxy](#oai-reverse-proxy)
+    * [Table of Contents](#table-of-contents)
+  * [What is this?](#what-is-this)
+  * [Features](#features)
+  * [Usage Instructions](#usage-instructions)
+    * [Personal Use (single-user)](#personal-use-single-user)
+      * [Updating](#updating)
+      * [Local Development](#local-development)
+    * [Self-hosting](#self-hosting)
+  * [Building](#building)
+  * [Forking](#forking)
+<!-- TOC -->
 
 ## What is this?
 This project allows you to run a reverse proxy server for various LLM APIs.
@@ -20,6 +24,7 @@ This project allows you to run a reverse proxy server for various LLM APIs.
   - [x] [OpenAI](https://openai.com/)
   - [x] [Anthropic](https://www.anthropic.com/)
   - [x] [AWS Bedrock](https://aws.amazon.com/bedrock/)
+  - [x] [Vertex AI (GCP)](https://cloud.google.com/vertex-ai/)
   - [x] [Google MakerSuite/Gemini API](https://ai.google.dev/)
   - [x] [Azure OpenAI](https://azure.microsoft.com/en-us/products/ai-services/openai-service)
 - [x] Translation from OpenAI-formatted prompts to any other API, including streaming responses
@@ -28,43 +33,40 @@ This project allows you to run a reverse proxy server for various LLM APIs.
   - [x] Simple role-based permissions
   - [x] Per-model token quotas
   - [x] Temporary user accounts
-- [x] Prompt and completion logging
+- [x] Event audit logging
+- [x] Optional full logging of prompts and completions
 - [x] Abuse detection and prevention
-
----
+  - [x] IP address and user token model invocation rate limits
+  - [x] IP blacklists
+  - [x] Proof-of-work challenge for access by anonymous users
 
 ## Usage Instructions
 If you'd like to run your own instance of this server, you'll need to deploy it somewhere and configure it with your API keys. A few easy options are provided below, though you can also deploy it to any other service you'd like if you know what you're doing and the service supports Node.js.
 
+### Personal Use (single-user)
+If you just want to run the proxy server to use yourself without hosting it for others:
+1. Install [Node.js](https://nodejs.org/en/download/) >= 18.0.0
+2. Clone this repository
+3. Create a `.env` file in the root of the project and add your API keys. See the [.env.example](./.env.example) file for an example.
+4. Install dependencies with `npm install`
+5. Run `npm run build`
+6. Run `npm start`
+
+#### Updating
+You must re-run `npm install` and `npm run build` whenever you pull new changes from the repository.
+
+#### Local Development
+Use `npm run start:dev` to run the proxy in development mode with watch mode enabled. Use `npm run type-check` to run the type checker across the project.
+
 ### Self-hosting
-[See here for instructions on how to self-host the application on your own VPS or local machine.](./docs/self-hosting.md)
+[See here for instructions on how to self-host the application on your own VPS or local machine and expose it to the internet for others to use.](./docs/self-hosting.md)
 
 **Ensure you set the `TRUSTED_PROXIES` environment variable according to your deployment.** Refer to [.env.example](./.env.example) and [config.ts](./src/config.ts) for more information.
 
-### Alternatives
-Fiz and Sekrit are working on some alternative ways to deploy this conveniently. While I'm not involved in this effort beyond providing technical advice regarding my code, I'll link to their work here for convenience: [Sekrit's rentry](https://rentry.org/sekrit)  
-
-### Huggingface (outdated, not advised)
-[See here for instructions on how to deploy to a Huggingface Space.](./docs/deploy-huggingface.md)
-
-### Render (outdated, not advised)
-[See here for instructions on how to deploy to Render.com.](./docs/deploy-render.md)
-
-## Local Development
-To run the proxy locally for development or testing, install Node.js >= 18.0.0 and follow the steps below.
-
-1. Clone the repo
-2. Install dependencies with `npm install`
-3. Create a `.env` file in the root of the project and add your API keys. See the [.env.example](./.env.example) file for an example.
-4. Start the server in development mode with `npm run start:dev`.
-
-You can also use `npm run start:dev:tsc` to enable project-wide type checking at the cost of slower startup times. `npm run type-check` can be used to run type checking without starting the server.
-
 ## Building
-To build the project, run `npm run build`. This will compile the TypeScript code to JavaScript and output it to the `build` directory.
+To build the project, run `npm run build`. This will compile the TypeScript code to JavaScript and output it to the `build` directory. You should run this whenever you pull new changes from the repository.
 
 Note that if you are trying to build the server on a very memory-constrained (<= 1GB) VPS, you may need to run the build with `NODE_OPTIONS=--max_old_space_size=2048 npm run build` to avoid running out of memory during the build process, assuming you have swap enabled.  The application itself should run fine on a 512MB VPS for most reasonable traffic levels.
 
 ## Forking
-
 If you are forking the repository on GitGud, you may wish to disable GitLab CI/CD or you will be spammed with emails about failed builds due not having any CI runners. You can do this by going to *Settings > General > Visibility, project features, permissions* and then disabling the "CI/CD" feature.

docker/render/Dockerfile

@@ -17,9 +17,8 @@ ARG GREETING_URL
 RUN if [ -n "$GREETING_URL" ]; then \
     curl -sL "$GREETING_URL" > greeting.md; \
     fi
-COPY package*.json greeting.md* ./
-RUN npm install
 COPY . .
+RUN npm install
 RUN npm run build
 RUN --mount=type=secret,id=_env,dst=/etc/secrets/.env cat /etc/secrets/.env >> .env
 EXPOSE 10000

docs/deploy-render.md

@@ -1,6 +1,6 @@
 # Deploy to Render.com
 
-**⚠️ This method is no longer recommended.  Please use the [self-hosting instructions](./self-hosting.md) instead.**
+**⚠️ This method is no longer supported or recommended and may not work.  Please use the [self-hosting instructions](./self-hosting.md) instead.**
 
 Render.com offers a free tier that includes 750 hours of compute time per month.  This is enough to run a single proxy instance 24/7.  Instances shut down after 15 minutes without traffic but start up again automatically when a request is received.  You can use something like https://app.checklyhq.com/ to ping your proxy every 15 minutes to keep it alive.
 

docs/gcp-configuration.md

@@ -0,0 +1,35 @@
+# Configuring the proxy for Vertex AI (GCP)
+
+The proxy supports GCP models via the `/proxy/gcp/claude` endpoint. There are a few extra steps necessary to use GCP compared to the other supported APIs.
+
+- [Setting keys](#setting-keys)
+- [Setup Vertex AI](#setup-vertex-ai)
+- [Supported model IDs](#supported-model-ids)
+
+## Setting keys
+
+Use the `GCP_CREDENTIALS` environment variable to set the GCP API keys.
+
+Like other APIs, you can provide multiple keys separated by commas. Each GCP key, however, is a set of credentials including the project id, client email, region and private key. These are separated by a colon (`:`).
+
+For example:
+
+```
+GCP_CREDENTIALS=my-first-project:xxx@yyy.com:us-east5:-----BEGIN PRIVATE KEY-----xxx-----END PRIVATE KEY-----,my-first-project2:xxx2@yyy.com:us-east5:-----BEGIN PRIVATE KEY-----xxx-----END PRIVATE KEY-----
+```
+
+## Setup Vertex AI
+1. Go to [https://cloud.google.com/vertex-ai](https://cloud.google.com/vertex-ai) and sign up for a GCP account. ($150 free credits without credit card or $300 free credits with credit card, credits expire in 90 days)
+2. Go to [https://console.cloud.google.com/marketplace/product/google/aiplatform.googleapis.com](https://console.cloud.google.com/marketplace/product/google/aiplatform.googleapis.com) to enable Vertex AI API.
+3. Go to [https://console.cloud.google.com/vertex-ai](https://console.cloud.google.com/vertex-ai) and navigate to Model Garden to apply for access to the Claude models.
+4. Create a [Service Account](https://console.cloud.google.com/projectselector/iam-admin/serviceaccounts/create?walkthrough_id=iam--create-service-account#step_index=1) , and make sure to grant the role of "Vertex AI User" or "Vertex AI Administrator".
+5. On the service account page you just created, create a new key and select "JSON". The JSON file will be downloaded automatically.
+6. The required credential is in the JSON file you just downloaded.
+
+## Supported model IDs
+Users can send these model IDs to the proxy to invoke the corresponding models.
+- **Claude**
+  - `claude-3-haiku@20240307`
+  - `claude-3-sonnet@20240229`
+  - `claude-3-opus@20240229`
+  - `claude-3-5-sonnet@20240620`

docs/pow-captcha.md

@@ -0,0 +1,135 @@
+# Proof-of-work Verification
+
+You can require users to complete a proof-of-work before they can access the
+proxy. This can increase the cost of denial of service attacks and slow down
+automated abuse.
+
+When configured, users access the challenge UI and request a token. The server
+sends a challenge to the client, which asks the user's browser to find a 
+solution to the challenge that meets a certain constraint (the difficulty
+level). Once the user has found a solution, they can submit it to the server
+and get a user token valid for a period you specify.
+
+The proof-of-work challenge uses the argon2id hash function.
+
+## Configuration
+
+To enable proof-of-work verification, set the following environment variables:
+
+```
+GATEKEEPER=user_token
+CAPTCHA_MODE=proof_of_work
+# Validity of the token in hours
+POW_TOKEN_HOURS=24
+# Max number of IPs that can use a user_token issued via proof-of-work
+POW_TOKEN_MAX_IPS=2
+# The difficulty level of the proof-of-work challenge. You can use one of the
+# predefined levels specified below, or you can specify a custom number of
+# expected hash iterations.
+POW_DIFFICULTY_LEVEL=low
+# The time limit for solving the challenge, in minutes
+POW_CHALLENGE_TIMEOUT=30
+```
+
+## Difficulty Levels
+
+The difficulty level controls how long, on average, it will take for a user to
+solve the proof-of-work challenge. Due to randomness, the actual time can very
+significantly; lucky users may solve the challenge in a fraction of the average
+time, while unlucky users may take much longer.
+
+The difficulty level doesn't affect the speed of the hash function itself, only
+the number of hashes that will need to be computed. Therefore, the time required
+to complete the challenge scales linearly with the difficulty level's iteration
+count.
+
+You can adjust the difficulty level while the proxy is running from the admin
+interface.
+
+Be aware that there is a time limit for solving the challenge, by default set to
+30 minutes. Above 'high' difficulty, you will probably need to increase the time
+limit or it will be very hard for users with slow devices to find a solution
+within the time limit.
+
+### Low
+
+- Average of 200 iterations required
+- Default setting.
+
+### Medium
+
+- Average of 900 iterations required
+
+### High
+
+- Average of 1900 iterations required
+
+### Extreme
+
+- Average of 4000 iterations required
+- Not recommended unless you are expecting very high levels of abuse
+- May require increasing `POW_CHALLENGE_TIMEOUT`
+
+### Custom
+
+Setting `POW_DIFFICULTY_LEVEL` to an integer will use that number of iterations
+as the difficulty level.
+
+## Other challenge settings
+
+- `POW_CHALLENGE_TIMEOUT`: The time limit for solving the challenge, in minutes.
+  Default is 30.
+- `POW_TOKEN_HOURS`: The period of time for which a user token issued via proof-
+  of-work can be used. Default is 24 hours. Starts when the challenge is solved.
+- `POW_TOKEN_MAX_IPS`: The maximum number of unique IPs that can use a single
+  user token issued via proof-of-work. Default is 2.
+- `POW_TOKEN_PURGE_HOURS`: The period of time after which an expired user token
+  issued via proof-of-work will be removed from the database. Until it is
+  purged, users can refresh expired tokens by completing a half-difficulty
+  challenge. Default is 48 hours.
+- `POW_MAX_TOKENS_PER_IP`: The maximum number of active user tokens that can
+  be associated with a single IP address. After this limit is reached, the
+  oldest token will be forcibly expired when a new token is issued. Set to 0
+  to disable this feature. Default is 0.
+
+## Custom argon2id parameters
+
+You can set custom argon2id parameters for the proof-of-work challenge.
+Generally, you should not need to change these unless you have a specific
+reason to do so.
+
+The listed values are the defaults.
+
+```
+ARGON2_TIME_COST=8
+ARGON2_MEMORY_KB=65536
+ARGON2_PARALLELISM=1
+ARGON2_HASH_LENGTH=32
+```
+
+Increasing parallelism will not do much except increase memory consumption for
+both the client and server, because browser proof-of-work implementations are
+single-threaded. It's better to increase the time cost if you want to increase
+the difficulty.
+
+Increasing memory too much may cause memory exhaustion on some mobile devices,
+particularly on iOS due to the way Safari handles WebAssembly memory allocation.
+
+## Tested hash rates
+
+These were measured with the default argon2id parameters listed above. These
+tests were not at all scientific so take them with a grain of salt.
+
+Safari does not like large WASM memory usage, so concurrency is limited to 4 to
+avoid overallocating memory on mobile WebKit browsers. Thermal throttling can
+also significantly reduce hash rates on mobile devices.
+
+- Intel Core i9-13900K (Chrome): 33-35 H/s
+- Intel Core i9-13900K (Firefox): 29-32 H/s
+- Intel Core i9-13900K (Chrome, in VM limited to 4 cores): 12.2 - 13.0 H/s
+- iPad Pro (M2) (Safari, 6 workers): 8.0 - 10 H/s
+  - Thermal throttles early. 8 cores is normal concurrency, but unstable.
+- iPhone 15 Pro Max (Safari): 4.0 - 4.6 H/s
+- Samsung Galaxy S10e (Chrome): 3.6 - 3.8 H/s
+  - This is a 2019 phone almost matching an iPhone five years newer because of
+    bad Safari performance.

docs/user-management.md

@@ -12,6 +12,7 @@ Several of these features require you to set secrets in your environment. If usi
   - [Memory](#memory)
   - [Firebase Realtime Database](#firebase-realtime-database)
     - [Firebase setup instructions](#firebase-setup-instructions)
+- [Whitelisting admin IP addresses](#whitelisting-admin-ip-addresses)
 
 ## No user management (`GATEKEEPER=none`)
 
@@ -61,3 +62,12 @@ To use Firebase Realtime Database to persist user data, set the following enviro
 8. Set `GATEKEEPER_STORE` to `firebase_rtdb` in your environment if you haven't already.
 
 The proxy server will attempt to connect to your Firebase Realtime Database at startup and will throw an error if it cannot connect. If you see this error, check that your `FIREBASE_RTDB_URL` and `FIREBASE_KEY` secrets are set correctly.
+
+## Whitelisting admin IP addresses
+You can add your own IP ranges to the `ADMIN_WHITELIST` environment variable for additional security.
+
+You can provide a comma-separated list containing individual IPv4 or IPv6 addresses, or CIDR ranges.
+
+To whitelist an entire IP range, use CIDR notation. For example, `192.168.0.1/24` would whitelist all addresses from `192.168.0.0` to `192.168.0.255`.
+
+To disable the whitelist, set `ADMIN_WHITELIST=0.0.0.0/0,::0`, which will allow access from any IPv4 or IPv6 address. This is the default behavior.

package.json

@@ -4,10 +4,12 @@
   "description": "Reverse proxy for the OpenAI API",
   "scripts": {
     "build": "tsc && copyfiles -u 1 src/**/*.ejs build",
+    "database:migrate": "ts-node scripts/migrate.ts",
+    "postinstall": "patch-package",
     "prepare": "husky install",
-    "start": "node build/server.js",
+    "start": "node --trace-deprecation --trace-warnings build/server.js",
     "start:dev": "nodemon --watch src --exec ts-node --transpile-only src/server.ts",
-    "start:replit": "tsc && node build/server.js",
+    "start:debug": "ts-node --inspect --transpile-only src/server.ts",
     "start:watch": "nodemon --require source-map-support/register build/server.js",
     "type-check": "tsc --noEmit"
   },
@@ -19,42 +21,52 @@
   "dependencies": {
     "@anthropic-ai/tokenizer": "^0.0.4",
     "@aws-crypto/sha256-js": "^5.2.0",
+    "@huggingface/jinja": "^0.3.0",
+    "@node-rs/argon2": "^1.8.3",
     "@smithy/eventstream-codec": "^2.1.3",
     "@smithy/eventstream-serde-node": "^2.1.3",
     "@smithy/protocol-http": "^3.2.1",
     "@smithy/signature-v4": "^2.1.3",
-    "@smithy/types": "^2.10.1",
     "@smithy/util-utf8": "^2.1.1",
-    "axios": "^1.3.5",
+    "axios": "^1.7.4",
+    "better-sqlite3": "^10.0.0",
     "check-disk-space": "^3.4.0",
     "cookie-parser": "^1.4.6",
     "copyfiles": "^2.4.1",
     "cors": "^2.8.5",
     "csrf-csrf": "^2.3.0",
     "dotenv": "^16.3.1",
-    "ejs": "^3.1.9",
-    "express": "^4.18.2",
+    "ejs": "^3.1.10",
+    "express": "^4.19.3",
     "express-session": "^1.17.3",
-    "firebase-admin": "^11.10.1",
+    "firebase-admin": "^12.5.0",
+    "glob": "^10.3.12",
     "googleapis": "^122.0.0",
-    "http-proxy-middleware": "^3.0.0-beta.1",
+    "http-proxy": "1.18.1",
+    "http-proxy-middleware": "^3.0.2",
+    "ipaddr.js": "^2.1.0",
     "memorystore": "^1.6.7",
     "multer": "^1.4.5-lts.1",
     "node-schedule": "^2.1.1",
+    "patch-package": "^8.0.0",
     "pino": "^8.11.0",
     "pino-http": "^8.3.3",
-    "sanitize-html": "2.12.1",
+    "proxy-agent": "^6.4.0",
+    "sanitize-html": "^2.13.0",
     "sharp": "^0.32.6",
     "showdown": "^2.1.0",
     "source-map-support": "^0.5.21",
     "stream-json": "^1.8.0",
     "tiktoken": "^1.0.10",
+    "tinyws": "^0.1.0",
     "uuid": "^9.0.0",
     "zlib": "^1.0.5",
     "zod": "^3.22.3",
     "zod-error": "^1.5.0"
   },
   "devDependencies": {
+    "@smithy/types": "^3.3.0",
+    "@types/better-sqlite3": "^7.6.10",
     "@types/cookie-parser": "^1.4.3",
     "@types/cors": "^2.8.13",
     "@types/express": "^4.17.17",
@@ -72,12 +84,13 @@
     "nodemon": "^3.0.1",
     "pino-pretty": "^10.2.3",
     "prettier": "^3.0.3",
+    "prettier-plugin-ejs": "^1.0.3",
     "ts-node": "^10.9.1",
     "typescript": "^5.4.2"
   },
   "overrides": {
-    "google-gax": "^3.6.1",
-    "postcss": "^8.4.31",
-    "follow-redirects": "^1.15.4"
+    "node-fetch@2.x": {
+      "whatwg-url": "14.x"
+    }
   }
 }

patches/README.md

@@ -0,0 +1,23 @@
+# Patches
+Contains monkey patches for certain packages, applied using `patch-package`.
+
+## `http-proxy+1.18.1.patch`
+Modifies the `http-proxy` package to work around an incompatibility with
+body-parser and SOCKS5 proxies due to some esoteric stream handling behavior
+when `socks-proxy-agent` is used instead of a generic http.Agent.
+
+Modification involves adjusting the `buffer` property on ProxyServer's `options`
+object to be a function that returns a stream instead of a stream itself. This
+allows us to give it a function which produces a new Readable from the already-
+parsed request body.
+
+With the old implementation we would need to create an entirely new ProxyServer
+instance for each request, which is not ideal under heavy load.
+
+`http-proxy` hasn't been updated in six years so it's unlikely that this patch
+will be broken by future updates, but it's stil pinned to 1.18.1 for now.
+
+### See also
+https://github.com/chimurai/http-proxy-middleware/issues/40
+https://github.com/chimurai/http-proxy-middleware/issues/299
+https://github.com/http-party/node-http-proxy/pull/1027

patches/http-proxy+1.18.1.patch

@@ -0,0 +1,13 @@
+diff --git a/node_modules/http-proxy/lib/http-proxy/passes/web-incoming.js b/node_modules/http-proxy/lib/http-proxy/passes/web-incoming.js
+index 7ae7355..c825c27 100644
+--- a/node_modules/http-proxy/lib/http-proxy/passes/web-incoming.js
++++ b/node_modules/http-proxy/lib/http-proxy/passes/web-incoming.js
+@@ -167,7 +167,7 @@ module.exports = {
+       }
+     }
+ 
+-    (options.buffer || req).pipe(proxyReq);
++    (options.buffer(req) || req).pipe(proxyReq);
+ 
+     proxyReq.on('response', function(proxyRes) {
+       if(server) { server.emit('proxyRes', proxyRes, req, res); }

public/css/reset.css

@@ -0,0 +1,349 @@
+/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
+
+/* Document
+   ========================================================================== */
+
+/**
+ * 1. Correct the line height in all browsers.
+ * 2. Prevent adjustments of font size after orientation changes in iOS.
+ */
+
+html {
+    line-height: 1.15; /* 1 */
+    -webkit-text-size-adjust: 100%; /* 2 */
+}
+
+/* Sections
+   ========================================================================== */
+
+/**
+ * Remove the margin in all browsers.
+ */
+
+body {
+    margin: 0;
+}
+
+/**
+ * Render the `main` element consistently in IE.
+ */
+
+main {
+    display: block;
+}
+
+/**
+ * Correct the font size and margin on `h1` elements within `section` and
+ * `article` contexts in Chrome, Firefox, and Safari.
+ */
+
+h1 {
+    font-size: 2em;
+    margin: 0.67em 0;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * 1. Add the correct box sizing in Firefox.
+ * 2. Show the overflow in Edge and IE.
+ */
+
+hr {
+    box-sizing: content-box; /* 1 */
+    height: 0; /* 1 */
+    overflow: visible; /* 2 */
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+pre {
+    font-family: monospace, monospace; /* 1 */
+    font-size: 1em; /* 2 */
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * Remove the gray background on active links in IE 10.
+ */
+
+a {
+    background-color: transparent;
+}
+
+/**
+ * 1. Remove the bottom border in Chrome 57-
+ * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+ */
+
+abbr[title] {
+    border-bottom: none; /* 1 */
+    text-decoration: underline; /* 2 */
+    text-decoration: underline dotted; /* 2 */
+}
+
+/**
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+    font-weight: bolder;
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+code,
+kbd,
+samp {
+    font-family: monospace, monospace; /* 1 */
+    font-size: 1em; /* 2 */
+}
+
+/**
+ * Add the correct font size in all browsers.
+ */
+
+small {
+    font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` elements from affecting the line height in
+ * all browsers.
+ */
+
+sub,
+sup {
+    font-size: 75%;
+    line-height: 0;
+    position: relative;
+    vertical-align: baseline;
+}
+
+sub {
+    bottom: -0.25em;
+}
+
+sup {
+    top: -0.5em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Remove the border on images inside links in IE 10.
+ */
+
+img {
+    border-style: none;
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * 1. Change the font styles in all browsers.
+ * 2. Remove the margin in Firefox and Safari.
+ */
+
+button,
+input,
+optgroup,
+select,
+textarea {
+    font-family: inherit; /* 1 */
+    font-size: 100%; /* 1 */
+    line-height: 1.15; /* 1 */
+    margin: 0; /* 2 */
+}
+
+/**
+ * Show the overflow in IE.
+ * 1. Show the overflow in Edge.
+ */
+
+button,
+input { /* 1 */
+    overflow: visible;
+}
+
+/**
+ * Remove the inheritance of text transform in Edge, Firefox, and IE.
+ * 1. Remove the inheritance of text transform in Firefox.
+ */
+
+button,
+select { /* 1 */
+    text-transform: none;
+}
+
+/**
+ * Correct the inability to style clickable types in iOS and Safari.
+ */
+
+button,
+[type="button"],
+[type="reset"],
+[type="submit"] {
+    -webkit-appearance: button;
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
+ */
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+    border-style: none;
+    padding: 0;
+}
+
+/**
+ * Restore the focus styles unset by the previous rule.
+ */
+
+button:-moz-focusring,
+[type="button"]:-moz-focusring,
+[type="reset"]:-moz-focusring,
+[type="submit"]:-moz-focusring {
+    outline: 1px dotted ButtonText;
+}
+
+/**
+ * Correct the padding in Firefox.
+ */
+
+fieldset {
+    padding: 0.35em 0.75em 0.625em;
+}
+
+/**
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Correct the color inheritance from `fieldset` elements in IE.
+ * 3. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
+ */
+
+legend {
+    box-sizing: border-box; /* 1 */
+    color: inherit; /* 2 */
+    display: table; /* 1 */
+    max-width: 100%; /* 1 */
+    padding: 0; /* 3 */
+    white-space: normal; /* 1 */
+}
+
+/**
+ * Add the correct vertical alignment in Chrome, Firefox, and Opera.
+ */
+
+progress {
+    vertical-align: baseline;
+}
+
+/**
+ * Remove the default vertical scrollbar in IE 10+.
+ */
+
+textarea {
+    overflow: auto;
+}
+
+/**
+ * 1. Add the correct box sizing in IE 10.
+ * 2. Remove the padding in IE 10.
+ */
+
+[type="checkbox"],
+[type="radio"] {
+    box-sizing: border-box; /* 1 */
+    padding: 0; /* 2 */
+}
+
+/**
+ * Correct the cursor style of increment and decrement buttons in Chrome.
+ */
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+    height: auto;
+}
+
+/**
+ * 1. Correct the odd appearance in Chrome and Safari.
+ * 2. Correct the outline style in Safari.
+ */
+
+[type="search"] {
+    -webkit-appearance: textfield; /* 1 */
+    outline-offset: -2px; /* 2 */
+}
+
+/**
+ * Remove the inner padding in Chrome and Safari on macOS.
+ */
+
+[type="search"]::-webkit-search-decoration {
+    -webkit-appearance: none;
+}
+
+/**
+ * 1. Correct the inability to style clickable types in iOS and Safari.
+ * 2. Change font properties to `inherit` in Safari.
+ */
+
+::-webkit-file-upload-button {
+    -webkit-appearance: button; /* 1 */
+    font: inherit; /* 2 */
+}
+
+/* Interactive
+   ========================================================================== */
+
+/*
+ * Add the correct display in Edge, IE 10+, and Firefox.
+ */
+
+details {
+    display: block;
+}
+
+/*
+ * Add the correct display in all browsers.
+ */
+
+summary {
+    display: list-item;
+}
+
+/* Misc
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 10+.
+ */
+
+template {
+    display: none;
+}
+
+/**
+ * Add the correct display in IE 10.
+ */
+
+[hidden] {
+    display: none;
+}

public/css/sakura-dark.css

@@ -0,0 +1,231 @@
+/* modified https://github.com/oxalorg/sakura */
+html {
+  font-size: 62.5%;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
+    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
+}
+body {
+  font-size: 1.8rem;
+  line-height: 1.618;
+  max-width: 38em;
+  margin: auto;
+  color: #c9c9c9;
+  background-color: #222222;
+  padding: 13px;
+}
+@media (max-width: 684px) {
+  body {
+    font-size: 1.53rem;
+  }
+}
+@media (max-width: 382px) {
+  body {
+    font-size: 1.35rem;
+  }
+}
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  line-height: 1.1;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
+    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
+  font-weight: 700;
+  margin-top: 3rem;
+  margin-bottom: 1.5rem;
+  overflow-wrap: break-word;
+  word-wrap: break-word;
+  -ms-word-break: break-all;
+  word-break: break-word;
+}
+h1 {
+  font-size: 2.35em;
+}
+h2 {
+  font-size: 2em;
+}
+h3 {
+  font-size: 1.75em;
+}
+h4 {
+  font-size: 1.5em;
+}
+h5 {
+  font-size: 1.25em;
+}
+h6 {
+  font-size: 1em;
+}
+p {
+  margin-top: 0px;
+  margin-bottom: 2.5rem;
+}
+small,
+sub,
+sup {
+  font-size: 75%;
+}
+hr {
+  border-color: #ffffff;
+}
+a {
+  text-decoration: none;
+  color: #ffffff;
+}
+a:visited {
+  color: #e6e6e6;
+}
+a:hover {
+  color: #c9c9c9;
+  text-decoration: underline;
+}
+ul {
+  padding-left: 1.4em;
+  margin-top: 0px;
+  margin-bottom: 2.5rem;
+}
+li {
+  margin-bottom: 0.4em;
+}
+blockquote {
+  margin-left: 0px;
+  margin-right: 0px;
+  padding-left: 1em;
+  padding-top: 0.8em;
+  padding-bottom: 0.8em;
+  padding-right: 0.8em;
+  border-left: 5px solid #ffffff;
+  margin-bottom: 2.5rem;
+  background-color: #4a4a4a;
+}
+blockquote p {
+  margin-bottom: 0;
+}
+img,
+video {
+  height: auto;
+  max-width: 100%;
+  margin-top: 0px;
+  margin-bottom: 2.5rem;
+}
+pre {
+  background-color: #4a4a4a;
+  display: block;
+  padding: 1em;
+  overflow-x: auto;
+  margin-top: 0px;
+  margin-bottom: 2.5rem;
+  font-size: 0.9em;
+}
+code,
+kbd,
+samp {
+  font-size: 0.9em;
+  padding: 0 0.5em;
+  background-color: #4a4a4a;
+  white-space: pre-wrap;
+}
+pre > code {
+  padding: 0;
+  background-color: transparent;
+  white-space: pre;
+  font-size: 1em;
+}
+table {
+  text-align: justify;
+  width: 100%;
+  border-collapse: collapse;
+  margin-bottom: 2rem;
+}
+td,
+th {
+  padding: 0.5em;
+  border-bottom: 1px solid #4a4a4a;
+}
+input,
+textarea {
+  border: 1px solid #c9c9c9;
+}
+input:focus,
+textarea:focus {
+  border: 1px solid #ffffff;
+}
+textarea {
+  width: 100%;
+}
+.button,
+button,
+input[type="submit"],
+input[type="reset"],
+input[type="button"],
+input[type="file"]::file-selector-button {
+  display: inline-block;
+  padding: 5px 10px;
+  text-align: center;
+  text-decoration: none;
+  white-space: nowrap;
+  background-color: #ffffff;
+  color: #222222;
+  border-radius: 1px;
+  border: 1px solid #ffffff;
+  cursor: pointer;
+  box-sizing: border-box;
+}
+.button[disabled],
+button[disabled],
+input[type="submit"][disabled],
+input[type="reset"][disabled],
+input[type="button"][disabled],
+input[type="file"][disabled] {
+  cursor: default;
+  opacity: 0.5;
+}
+.button:hover,
+button:hover,
+input[type="submit"]:hover,
+input[type="reset"]:hover,
+input[type="button"]:hover,
+input[type="file"]::file-selector-button:hover {
+  background-color: #c9c9c9;
+  color: #222222;
+  outline: 0;
+}
+.button:focus-visible,
+button:focus-visible,
+input[type="submit"]:focus-visible,
+input[type="reset"]:focus-visible,
+input[type="button"]:focus-visible,
+input[type="file"]::file-selector-button:focus-visible {
+  outline-style: solid;
+  outline-width: 2px;
+}
+textarea,
+select,
+input {
+  color: #c9c9c9;
+  padding: 6px 10px;
+  margin-bottom: 10px;
+  background-color: #4a4a4a;
+  border: 1px solid #4a4a4a;
+  border-radius: 4px;
+  box-shadow: none;
+  box-sizing: border-box;
+}
+textarea:focus,
+select:focus,
+input:focus {
+  border: 1px solid #ffffff;
+  outline: 0;
+}
+input[type="checkbox"]:focus {
+  outline: 1px dotted #ffffff;
+}
+label,
+legend,
+fieldset {
+  display: block;
+  margin-bottom: 0.5rem;
+  font-weight: 600;
+}

public/css/sakura.css

@@ -0,0 +1,237 @@
+/* modified https://github.com/oxalorg/sakura */
+:root {
+  --accent-color: #4a4a4a;
+  --accent-color-hover: #5a5a5a;
+  --link-color: #58739c;
+  --link-visted-color: #6f5e6f;
+}
+html {
+  font-size: 62.5%;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
+    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
+}
+body {
+  font-size: 1.8rem;
+  line-height: 1.618;
+  max-width: 38em;
+  margin: auto;
+  color: #4a4a4a;
+  background-color: #f9f9f9;
+  padding: 13px;
+}
+@media (max-width: 684px) {
+  body {
+    font-size: 1.53rem;
+  }
+}
+@media (max-width: 382px) {
+  body {
+    font-size: 1.35rem;
+  }
+}
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  line-height: 1.1;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
+    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
+  font-weight: 700;
+  margin-top: 3rem;
+  margin-bottom: 1.5rem;
+  overflow-wrap: break-word;
+  word-wrap: break-word;
+  -ms-word-break: break-all;
+  word-break: break-word;
+}
+h1 {
+  font-size: 2.35em;
+}
+h2 {
+  font-size: 2em;
+}
+h3 {
+  font-size: 1.75em;
+}
+h4 {
+  font-size: 1.5em;
+}
+h5 {
+  font-size: 1.25em;
+}
+h6 {
+  font-size: 1em;
+}
+p {
+  margin-top: 0;
+  margin-bottom: 2.5rem;
+}
+small,
+sub,
+sup {
+  font-size: 75%;
+}
+hr {
+  border-color: var(--accent-color);
+}
+a {
+  text-decoration: none;
+  color: var(--link-color);
+}
+a:visited {
+  color: var(--link-visted-color);
+}
+a:hover {
+  color: var(--accent-color-hover);
+  text-decoration: underline;
+}
+ul {
+  padding-left: 1.4em;
+  margin-top: 0;
+  margin-bottom: 2.5rem;
+}
+li {
+  margin-bottom: 0.4em;
+}
+blockquote {
+  margin-left: 0;
+  margin-right: 0;
+  padding-left: 1em;
+  padding-top: 0.8em;
+  padding-bottom: 0.8em;
+  padding-right: 0.8em;
+  border-left: 5px solid var(--accent-color);
+  margin-bottom: 2.5rem;
+  background-color: #f1f1f1;
+}
+blockquote p {
+  margin-bottom: 0;
+}
+img,
+video {
+  height: auto;
+  max-width: 100%;
+  margin-top: 0;
+  margin-bottom: 2.5rem;
+}
+pre {
+  background-color: #f1f1f1;
+  display: block;
+  padding: 1em;
+  overflow-x: auto;
+  margin-top: 0;
+  margin-bottom: 2.5rem;
+  font-size: 0.9em;
+}
+code,
+kbd,
+samp {
+  font-size: 0.9em;
+  padding: 0 0.5em;
+  background-color: #f1f1f1;
+  white-space: pre-wrap;
+}
+pre > code {
+  padding: 0;
+  background-color: transparent;
+  white-space: pre;
+  font-size: 1em;
+}
+table {
+  text-align: justify;
+  width: 100%;
+  border-collapse: collapse;
+  margin-bottom: 2rem;
+}
+td,
+th {
+  padding: 0.5em;
+  border-bottom: 1px solid #f1f1f1;
+}
+input,
+textarea {
+  border: 1px solid #4a4a4a;
+}
+input:focus,
+textarea:focus {
+  border: 1px solid var(--accent-color);
+}
+textarea {
+  width: 100%;
+}
+.button,
+button,
+input[type="submit"],
+input[type="reset"],
+input[type="button"],
+input[type="file"]::file-selector-button {
+  display: inline-block;
+  padding: 5px 10px;
+  text-align: center;
+  text-decoration: none;
+  white-space: nowrap;
+  background-color: var(--accent-color);
+  color: #f9f9f9;
+  border-radius: 2px;
+  border: 1px solid var(--accent-color);
+  cursor: pointer;
+  box-sizing: border-box;
+}
+.button[disabled],
+button[disabled],
+input[type="submit"][disabled],
+input[type="reset"][disabled],
+input[type="button"][disabled],
+input[type="file"][disabled] {
+  cursor: default;
+  opacity: 0.5;
+}
+.button:hover,
+button:hover,
+input[type="submit"]:hover,
+input[type="reset"]:hover,
+input[type="button"]:hover,
+input[type="file"]::file-selector-button:hover {
+  background-color: var(--accent-color-hover);
+  color: #f9f9f9;
+  outline: 0;
+}
+.button:focus-visible,
+button:focus-visible,
+input[type="submit"]:focus-visible,
+input[type="reset"]:focus-visible,
+input[type="button"]:focus-visible,
+input[type="file"]::file-selector-button:focus-visible {
+  outline-style: solid;
+  outline-width: 2px;
+}
+textarea,
+select,
+input {
+  color: #4a4a4a;
+  padding: 6px 10px;
+  margin-bottom: 10px;
+  background-color: #f1f1f1;
+  border: 1px solid #f1f1f1;
+  border-radius: 4px;
+  box-shadow: none;
+  box-sizing: border-box;
+}
+textarea:focus,
+select:focus,
+input:focus {
+  border: 1px solid var(--accent-color);
+  outline: 0;
+}
+input[type="checkbox"]:focus {
+  outline: 1px dotted var(--accent-color);
+}
+label,
+legend,
+fieldset {
+  display: block;
+  margin-bottom: 0.5rem;
+  font-weight: 600;
+}

public/js/hash-worker.js

@@ -0,0 +1,120 @@
+importScripts(
+  "https://cdn.jsdelivr.net/npm/hash-wasm@4.11.0/dist/argon2.umd.min.js"
+);
+
+let active = false;
+let nonce = 0;
+let signature = "";
+let lastNotify = 0;
+let hashesSinceLastNotify = 0;
+let params = {
+  salt: null,
+  hashLength: 0,
+  iterations: 0,
+  memorySize: 0,
+  parallelism: 0,
+  targetValue: BigInt(0),
+  safariFix: false,
+};
+
+self.onmessage = async (event) => {
+  const { data } = event;
+  switch (data.type) {
+    case "stop":
+      active = false;
+      self.postMessage({ type: "paused", hashes: hashesSinceLastNotify });
+      return;
+    case "start":
+      active = true;
+      signature = data.signature;
+      nonce = data.nonce;
+
+      const c = data.challenge;
+      const salt = new Uint8Array(c.s.length / 2);
+      for (let i = 0; i < c.s.length; i += 2) {
+        salt[i / 2] = parseInt(c.s.slice(i, i + 2), 16);
+      }
+
+      params = {
+        salt: salt,
+        hashLength: c.hl,
+        iterations: c.t,
+        memorySize: c.m,
+        parallelism: c.p,
+        targetValue: BigInt(c.d.slice(0, -1)),
+        safariFix: data.isMobileWebkit,
+      };
+
+      console.log("Started", params);
+      self.postMessage({ type: "started" });
+      setTimeout(solve, 0);
+      break;
+  }
+};
+
+const doHash = async (password) => {
+  const { salt, hashLength, iterations, memorySize, parallelism } = params;
+  return await self.hashwasm.argon2id({
+    password,
+    salt,
+    hashLength,
+    iterations,
+    memorySize,
+    parallelism,
+  });
+};
+
+const checkHash = (hash) => {
+  const { targetValue } = params;
+  const hashValue = BigInt(`0x${hash}`);
+  return hashValue <= targetValue;
+};
+
+const solve = async () => {
+  if (!active) {
+    console.log("Stopped solver", nonce);
+    return;
+  }
+
+  // Safari WASM doesn't like multiple calls in one worker
+  const batchSize = 1;
+  const batch = [];
+  for (let i = 0; i < batchSize; i++) {
+    batch.push(nonce++);
+  }
+
+  try {
+    const results = await Promise.all(
+      batch.map(async (nonce) => {
+        const hash = await doHash(String(nonce));
+        return { hash, nonce };
+      })
+    );
+    hashesSinceLastNotify += batchSize;
+
+    const solution = results.find(({ hash }) => checkHash(hash));
+    if (solution) {
+      console.log("Solution found", solution, params.salt);
+      self.postMessage({ type: "solved", nonce: solution.nonce });
+      active = false;
+    } else {
+      if (Date.now() - lastNotify >= 500) {
+        console.log("Last nonce", nonce, "Hashes", hashesSinceLastNotify);
+        self.postMessage({ type: "progress", hashes: hashesSinceLastNotify });
+        lastNotify = Date.now();
+        hashesSinceLastNotify = 0;
+      }
+      setTimeout(solve, 10);
+    }
+  } catch (error) {
+    console.error("Error", error);
+    const stack = error.stack;
+    const debug = {
+      stack,
+      lastNonce: nonce,
+      targetValue: params.targetValue,
+    };
+    self.postMessage({ type: "error", error: error.message, debug });
+    active = false;
+  }
+};

scripts/migrate.ts

@@ -0,0 +1,39 @@
+import Database from "better-sqlite3";
+import { DATABASE_VERSION, migrateDatabase } from "../src/shared/database";
+import { logger } from "../src/logger";
+import { config } from "../src/config";
+
+const log = logger.child({ module: "scripts/migrate" });
+
+async function runMigration() {
+  let targetVersion = Number(process.argv[2]) || undefined;
+
+  if (!targetVersion) {
+    log.info("Enter target version or leave empty to use the latest version.");
+    process.stdin.resume();
+    process.stdin.setEncoding("utf8");
+    const input = await new Promise<string>((resolve) => {
+      process.stdin.on("data", (text) => {
+        resolve((String(text) || "").trim());
+      });
+    });
+    process.stdin.pause();
+    targetVersion = Number(input);
+    if (!targetVersion) {
+      targetVersion = DATABASE_VERSION;
+    }
+  }
+
+  const db = new Database(config.sqliteDataPath, {
+    verbose: (msg, ...args) => log.debug({ args }, String(msg)),
+  });
+
+  const currentVersion = db.pragma("user_version", { simple: true });
+  log.info({ currentVersion, targetVersion }, "Running migrations.");
+  migrateDatabase(targetVersion, db);
+}
+
+runMigration().catch((error) => {
+  log.error(error, "Migration failed.");
+  process.exit(1);
+});

scripts/oai-reverse-proxy.http

@@ -230,6 +230,39 @@ Content-Type: application/json
   ]
 }
 
+###
+# @name Proxy / GCP Claude -- Native Completion
+POST {{proxy-host}}/proxy/gcp/claude/v1/complete
+Authorization: Bearer {{proxy-key}}
+anthropic-version: 2023-01-01
+Content-Type: application/json
+
+{
+  "model": "claude-v2",
+  "max_tokens_to_sample": 10,
+  "temperature": 0,
+  "stream": true,
+  "prompt": "What is genshin impact\n\n:Assistant:"
+}
+
+###
+# @name Proxy / GCP Claude -- OpenAI-to-Anthropic API Translation
+POST {{proxy-host}}/proxy/gcp/claude/chat/completions
+Authorization: Bearer {{proxy-key}}
+Content-Type: application/json
+
+{
+  "model": "gpt-3.5-turbo",
+  "max_tokens": 50,
+  "stream": true,
+  "messages": [
+    {
+      "role": "user",
+      "content": "What is genshin impact?"
+    }
+  ]
+}
+
 ###
 # @name Proxy / Azure OpenAI -- Native Chat Completions
 POST {{proxy-host}}/proxy/azure/openai/chat/completions

scripts/seed-events.ts

@@ -0,0 +1,102 @@
+import Database from "better-sqlite3";
+import { v4 as uuidv4 } from "uuid";
+import { config } from "../src/config";
+
+function generateRandomIP() {
+  return (
+    Math.floor(Math.random() * 255) +
+    "." +
+    Math.floor(Math.random() * 255) +
+    "." +
+    Math.floor(Math.random() * 255) +
+    "." +
+    Math.floor(Math.random() * 255)
+  );
+}
+
+function generateRandomDate() {
+  const end = new Date();
+  const start = new Date(end);
+  start.setDate(end.getDate() - 90);
+  const randomDate = new Date(
+    start.getTime() + Math.random() * (end.getTime() - start.getTime())
+  );
+  return randomDate.toISOString();
+}
+
+function generateMockSHA256() {
+  const characters = 'abcdef0123456789';
+  let hash = '';
+
+  for (let i = 0; i < 64; i++) {
+    const randomIndex = Math.floor(Math.random() * characters.length);
+    hash += characters[randomIndex];
+  }
+
+  return hash;
+}
+
+function getRandomModelFamily() {
+  const modelFamilies = [
+    "turbo",
+    "gpt4",
+    "gpt4-32k",
+    "gpt4-turbo",
+    "claude",
+    "claude-opus",
+    "gemini-pro",
+    "mistral-tiny",
+    "mistral-small",
+    "mistral-medium",
+    "mistral-large",
+    "aws-claude",
+    "aws-claude-opus",
+    "gcp-claude",
+    "gcp-claude-opus",
+    "azure-turbo",
+    "azure-gpt4",
+    "azure-gpt4-32k",
+    "azure-gpt4-turbo",
+    "dall-e",
+    "azure-dall-e",
+  ];
+  return modelFamilies[Math.floor(Math.random() * modelFamilies.length)];
+}
+
+(async () => {
+  const db = new Database(config.sqliteDataPath);
+  const numRows = 100;
+  const insertStatement = db.prepare(`
+  INSERT INTO events (type, ip, date, model, family, hashes, userToken, inputTokens, outputTokens)
+  VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+`);
+
+  const users = Array.from({ length: 10 }, () => uuidv4());
+  function getRandomUser() {
+    return users[Math.floor(Math.random() * users.length)];
+  }
+
+  const transaction = db.transaction(() => {
+    for (let i = 0; i < numRows; i++) {
+      insertStatement.run(
+        "chat_completion",
+        generateRandomIP(),
+        generateRandomDate(),
+        getRandomModelFamily() + "-" + Math.floor(Math.random() * 100),
+        getRandomModelFamily(),
+        Array.from(
+          { length: Math.floor(Math.random() * 10) },
+          generateMockSHA256
+        ).join(","),
+        getRandomUser(),
+        Math.floor(Math.random() * 500),
+        Math.floor(Math.random() * 6000)
+      );
+    }
+  });
+
+  transaction();
+
+  console.log(`Inserted ${numRows} rows into the events table.`);
+  db.close();
+})();

scripts/test-aws-signing.ts

@@ -0,0 +1,118 @@
+// uses the aws sdk to sign a request, then uses axios to send it to the bedrock REST API manually
+import axios from "axios";
+import { Sha256 } from "@aws-crypto/sha256-js";
+import { SignatureV4 } from "@smithy/signature-v4";
+import { HttpRequest } from "@smithy/protocol-http";
+
+const AWS_ACCESS_KEY_ID = process.env.AWS_ACCESS_KEY_ID!;
+const AWS_SECRET_ACCESS_KEY = process.env.AWS_SECRET_ACCESS_KEY!;
+
+// Copied from amazon bedrock docs
+
+// List models
+// ListFoundationModels
+// Service: Amazon Bedrock
+// List of Bedrock foundation models that you can use. For more information, see Foundation models in the
+// Bedrock User Guide.
+//   Request Syntax
+// GET /foundation-models?
+//   byCustomizationType=byCustomizationType&byInferenceType=byInferenceType&byOutputModality=byOutputModality&byProvider=byProvider
+//   HTTP/1.1
+// URI Request Parameters
+// The request uses the following URI parameters.
+// byCustomizationType (p. 38)
+// List by customization type.
+//   Valid Values: FINE_TUNING
+// byInferenceType (p. 38)
+// List by inference type.
+//   Valid Values: ON_DEMAND | PROVISIONED
+// byOutputModality (p. 38)
+// List by output modality type.
+//   Valid Values: TEXT | IMAGE | EMBEDDING
+// byProvider (p. 38)
+// A Bedrock model provider.
+//   Pattern: ^[a-z0-9-]{1,63}$
+// Request Body
+// The request does not have a request body
+
+// Run inference on a text model
+// Send an invoke request to run inference on a Titan Text G1 - Express model. We set the accept
+// parameter to accept any content type in the response.
+//   POST https://bedrock.us-east-1.amazonaws.com/model/amazon.titan-text-express-v1/invoke
+//   -H accept: */*
+// -H content-type: application/json
+// Payload
+// {"inputText": "Hello world"}
+// Example response
+// Response for the above request.
+// -H content-type: application/json
+// Payload
+// <the model response>
+
+const AMZ_REGION = "us-east-1";
+const AMZ_HOST = "invoke-bedrock.us-east-1.amazonaws.com";
+
+async function listModels() {
+  const httpRequest = new HttpRequest({
+    method: "GET",
+    protocol: "https:",
+    hostname: AMZ_HOST,
+    path: "/foundation-models",
+    headers: { ["Host"]: AMZ_HOST },
+  });
+
+  const signedRequest = await signRequest(httpRequest);
+  const response = await axios.get(
+    `https://${signedRequest.hostname}${signedRequest.path}`,
+    { headers: signedRequest.headers }
+  );
+  console.log(response.data);
+}
+
+async function invokeModel() {
+  const model = "anthropic.claude-v1";
+  const httpRequest = new HttpRequest({
+    method: "POST",
+    protocol: "https:",
+    hostname: AMZ_HOST,
+    path: `/model/${model}/invoke`,
+    headers: {
+      ["Host"]: AMZ_HOST,
+      ["accept"]: "*/*",
+      ["content-type"]: "application/json",
+    },
+    body: JSON.stringify({
+      temperature: 0.5,
+      prompt: "\n\nHuman:Hello world\n\nAssistant:",
+      max_tokens_to_sample: 10,
+    }),
+  });
+  console.log("httpRequest", httpRequest);
+
+  const signedRequest = await signRequest(httpRequest);
+  const response = await axios.post(
+    `https://${signedRequest.hostname}${signedRequest.path}`,
+    signedRequest.body,
+    { headers: signedRequest.headers }
+  );
+  console.log(response.status);
+  console.log(response.headers);
+  console.log(response.data);
+  console.log("full url", response.request.res.responseUrl);
+}
+
+async function signRequest(request: HttpRequest) {
+  const signer = new SignatureV4({
+    sha256: Sha256,
+    credentials: {
+      accessKeyId: AWS_ACCESS_KEY_ID,
+      secretAccessKey: AWS_SECRET_ACCESS_KEY,
+    },
+    region: AMZ_REGION,
+    service: "bedrock",
+  });
+  return await signer.sign(request, { signingDate: new Date() });
+}
+
+// listModels();
+// invokeModel();

scripts/test-queue.js

@@ -0,0 +1,53 @@
+const axios = require("axios");
+
+function randomInteger(max) {
+  return Math.floor(Math.random() * max + 1);
+}
+
+async function testQueue() {
+  const requests = Array(10).fill(undefined).map(async function() {
+    const maxTokens = randomInteger(2000);
+
+    const headers = {
+      "Authorization": "Bearer test",
+      "Content-Type": "application/json",
+      "X-Forwarded-For": `${randomInteger(255)}.${randomInteger(255)}.${randomInteger(255)}.${randomInteger(255)}`,
+    };
+
+    const payload = {
+      model: "gpt-4o-mini-2024-07-18",
+      max_tokens: 20 + maxTokens,
+      stream: false,
+      messages: [{role: "user", content: "You are being benchmarked regarding your reliability at outputting exact, machine-comprehensible data. Output the sentence \"The quick brown fox jumps over the lazy dog.\" Do not precede it with quotemarks or any form of preamble, and do not output anything after the sentence."}],
+      temperature: 0,
+    };
+
+    try {
+      const response = await axios.post(
+        "http://localhost:7860/proxy/openai/v1/chat/completions",
+        payload,
+        { headers }
+      );
+
+            if (response.status !== 200) {
+          console.error(`Request {$maxTokens} finished with status code ${response.status} and response`, response.data);
+          return;
+        }
+
+      const content = response.data.choices[0].message.content;
+
+      console.log(
+        `Request ${maxTokens} `,
+        content === "The quick brown fox jumps over the lazy dog." ? "OK" : `mangled: ${content}`
+      );
+    } catch (error) {
+      const msg = error.response;
+      console.error(`Error in req ${maxTokens}:`, error.message, msg || "");
+    }
+  });
+
+  await Promise.all(requests);
+  console.log("All requests finished");
+}
+
+testQueue();

src/admin/api/events.ts

@@ -0,0 +1,49 @@
+import { Router } from "express";
+import { z } from "zod";
+import { encodeCursor, decodeCursor } from "../../shared/utils";
+import { eventsRepo } from "../../shared/database/repos/event";
+
+const router = Router();
+
+/**
+ * Returns events for the given user token.
+ * GET /admin/events/:token
+ * @query first - The number of events to return.
+ * @query after - The cursor to start returning events from (exclusive).
+ */
+router.get("/:token", (req, res) => {
+  const schema = z.object({
+    token: z.string(),
+    first: z.coerce.number().int().positive().max(200).default(25),
+    after: z
+      .string()
+      .optional()
+      .transform((v) => {
+        try {
+          return decodeCursor(v);
+        } catch {
+          return null;
+        }
+      })
+      .nullable(),
+    sort: z.string().optional(),
+  });
+  const args = schema.safeParse({ ...req.params, ...req.query });
+  if (!args.success) {
+    return res.status(400).json({ error: args.error });
+  }
+
+  const data = eventsRepo
+    .getUserEvents(args.data.token, {
+      limit: args.data.first,
+      cursor: args.data.after,
+    })
+    .map((e) => ({ node: e, cursor: encodeCursor(e.date) }));
+
+  res.json({
+    data,
+    endCursor: data[data.length - 1]?.cursor,
+  });
+});
+
+export { router as eventsApiRouter };

src/admin/routes.ts

@@ -1,17 +1,31 @@
 import express, { Router } from "express";
-import { authorize } from "./auth";
+import { createWhitelistMiddleware } from "../shared/cidr";
 import { HttpError } from "../shared/errors";
+import { injectCsrfToken, checkCsrfToken } from "../shared/inject-csrf";
 import { injectLocals } from "../shared/inject-locals";
 import { withSession } from "../shared/with-session";
-import { injectCsrfToken, checkCsrfToken } from "../shared/inject-csrf";
+import { config } from "../config";
 import { renderPage } from "../info-page";
 import { buildInfo } from "../service-info";
+import { authorize } from "./auth";
 import { loginRouter } from "./login";
-import { usersApiRouter as apiRouter } from "./api/users";
+import { eventsApiRouter } from "./api/events";
+import { usersApiRouter } from "./api/users";
 import { usersWebRouter as webRouter } from "./web/manage";
+import { logger } from "../logger";
 
 const adminRouter = Router();
 
+const whitelist = createWhitelistMiddleware(
+  "ADMIN_WHITELIST",
+  config.adminWhitelist
+);
+
+if (!whitelist.ranges.length && config.adminKey?.length) {
+  logger.error("ADMIN_WHITELIST is empty. No admin requests will be allowed. Set 0.0.0.0/0 to allow all.");
+}
+
+adminRouter.use(whitelist);
 adminRouter.use(
   express.json({ limit: "20mb" }),
   express.urlencoded({ extended: true, limit: "20mb" })
@@ -19,7 +33,8 @@ adminRouter.use(
 adminRouter.use(withSession);
 adminRouter.use(injectCsrfToken);
 
-adminRouter.use("/users", authorize({ via: "header" }), apiRouter);
+adminRouter.use("/users", authorize({ via: "header" }), usersApiRouter);
+adminRouter.use("/events", authorize({ via: "header" }), eventsApiRouter);
 
 adminRouter.use(checkCsrfToken);
 adminRouter.use(injectLocals);

src/admin/web/manage.ts

@@ -1,4 +1,5 @@
 import { Router } from "express";
+import ipaddr from "ipaddr.js";
 import multer from "multer";
 import { z } from "zod";
 import { config } from "../../config";
@@ -15,6 +16,8 @@ import {
   UserTokenCounts,
 } from "../../shared/users/schema";
 import { getLastNImages } from "../../shared/file-storage/image-history";
+import { blacklists, parseCidrs, whitelists } from "../../shared/cidr";
+import { invalidatePowChallenges } from "../../user/web/pow-captcha";
 
 const router = Router();
 
@@ -40,6 +43,74 @@ router.get("/create-user", (req, res) => {
   });
 });
 
+router.get("/anti-abuse", (_req, res) => {
+  const wl = [...whitelists.entries()];
+  const bl = [...blacklists.entries()];
+
+  res.render("admin_anti-abuse", {
+    captchaMode: config.captchaMode,
+    difficulty: config.powDifficultyLevel,
+    whitelists: wl.map((w) => ({
+      name: w[0],
+      mode: "whitelist",
+      ranges: w[1].ranges,
+    })),
+    blacklists: bl.map((b) => ({
+      name: b[0],
+      mode: "blacklist",
+      ranges: b[1].ranges,
+    })),
+  });
+});
+
+router.post("/cidr", (req, res) => {
+  const body = req.body;
+  const valid = z
+    .object({
+      action: z.enum(["add", "remove"]),
+      mode: z.enum(["whitelist", "blacklist"]),
+      name: z.string().min(1),
+      mask: z.string().min(1),
+    })
+    .safeParse(body);
+
+  if (!valid.success) {
+    throw new HttpError(
+      400,
+      valid.error.issues.flatMap((issue) => issue.message).join(", ")
+    );
+  }
+
+  const { mode, name, mask } = valid.data;
+  const list = (mode === "whitelist" ? whitelists : blacklists).get(name);
+  if (!list) {
+    throw new HttpError(404, "List not found");
+  }
+  if (valid.data.action === "remove") {
+    const newRanges = new Set(list.ranges);
+    newRanges.delete(mask);
+    list.updateRanges([...newRanges]);
+    req.session.flash = {
+      type: "success",
+      message: `${mode} ${name} updated`,
+    };
+    return res.redirect("/admin/manage/anti-abuse");
+  } else if (valid.data.action === "add") {
+    const result = parseCidrs(mask);
+    if (result.length === 0) {
+      throw new HttpError(400, "Invalid CIDR mask");
+    }
+
+    const newRanges = new Set([...list.ranges, mask]);
+    list.updateRanges([...newRanges]);
+    req.session.flash = {
+      type: "success",
+      message: `${mode} ${name} updated`,
+    };
+    return res.redirect("/admin/manage/anti-abuse");
+  }
+});
+
 router.post("/create-user", (req, res) => {
   const body = req.body;
 
@@ -197,7 +268,14 @@ router.post("/maintenance", (req, res) => {
   let flash = { type: "", message: "" };
   switch (action) {
     case "recheck": {
-      const checkable: LLMService[] = ["openai", "anthropic", "aws", "azure"];
+      const checkable: LLMService[] = [
+        "openai",
+        "anthropic",
+        "aws",
+        "gcp",
+        "azure",
+        "google-ai"
+      ];
       checkable.forEach((s) => keyPool.recheck(s));
       const keyCount = keyPool
         .list()
@@ -223,10 +301,14 @@ router.post("/maintenance", (req, res) => {
       break;
     }
     case "downloadImageMetadata": {
-      const data = JSON.stringify({
-        exportedAt: new Date().toISOString(),
-        generations: getLastNImages()
-      }, null, 2);
+      const data = JSON.stringify(
+        {
+          exportedAt: new Date().toISOString(),
+          generations: getLastNImages(),
+        },
+        null,
+        2
+      );
       res.setHeader(
         "Content-Disposition",
         `attachment; filename=image-metadata-${new Date().toISOString()}.json`
@@ -234,14 +316,123 @@ router.post("/maintenance", (req, res) => {
       res.setHeader("Content-Type", "application/json");
       return res.send(data);
     }
+    case "expireTempTokens": {
+      const users = userStore.getUsers();
+      const temps = users.filter((u) => u.type === "temporary");
+      temps.forEach((user) => {
+        user.expiresAt = Date.now();
+        user.disabledReason = "Admin forced expiration.";
+        userStore.upsertUser(user);
+      });
+      invalidatePowChallenges();
+      flash.type = "success";
+      flash.message = `${temps.length} temporary users marked for expiration.`;
+      break;
+    }
+    case "cleanTempTokens": {
+      const users = userStore.getUsers();
+      const disabledTempUsers = users.filter(
+        (u) => u.type === "temporary" && u.expiresAt && u.expiresAt < Date.now()
+      );
+      disabledTempUsers.forEach((user) => {
+        user.disabledAt = 1; //will be cleaned up by the next cron job
+        userStore.upsertUser(user);
+      });
+      flash.type = "success";
+      flash.message = `${disabledTempUsers.length} disabled temporary users marked for cleanup.`;
+      break;
+    }
+    case "setDifficulty": {
+      const selected = req.body["pow-difficulty"];
+      const valid = ["low", "medium", "high", "extreme"];
+      const isNumber = Number.isInteger(Number(selected));
+      if (!selected || !valid.includes(selected) && !isNumber) {
+        throw new HttpError(400, "Invalid difficulty " + selected);
+      }
+      config.powDifficultyLevel = isNumber ? Number(selected) : selected;
+      invalidatePowChallenges();
+      break;
+    }
+    case "generateTempIpReport": {
+      const tempUsers = userStore
+        .getUsers()
+        .filter((u) => u.type === "temporary");
+      const ipv4RangeMap = new Map<string, Set<string>>();
+      const ipv6RangeMap = new Map<string, Set<string>>();
+
+      tempUsers.forEach((u) => {
+        u.ip.forEach((ip) => {
+          try {
+            const parsed = ipaddr.parse(ip);
+            if (parsed.kind() === "ipv4") {
+              const subnet =
+                parsed.toNormalizedString().split(".").slice(0, 3).join(".") +
+                ".0/24";
+              const userSet = ipv4RangeMap.get(subnet) || new Set();
+              userSet.add(u.token);
+              ipv4RangeMap.set(subnet, userSet);
+            } else if (parsed.kind() === "ipv6") {
+              const subnet =
+                parsed.toNormalizedString().split(":").slice(0, 4).join(":") +
+                "::/48";
+              const userSet = ipv6RangeMap.get(subnet) || new Set();
+              userSet.add(u.token);
+              ipv6RangeMap.set(subnet, userSet);
+            }
+          } catch (e) {
+            req.log.warn(
+              { ip, error: e.message },
+              "Invalid IP address; skipping"
+            );
+          }
+        });
+      });
+
+      const ipv4Ranges = Array.from(ipv4RangeMap.entries())
+        .map(([subnet, userSet]) => ({
+          subnet,
+          distinctTokens: userSet.size,
+        }))
+        .sort((a, b) => b.distinctTokens - a.distinctTokens);
+
+      const ipv6Ranges = Array.from(ipv6RangeMap.entries())
+        .map(([subnet, userSet]) => ({
+          subnet,
+          distinctTokens: userSet.size,
+        }))
+        .sort((a, b) => {
+          if (a.distinctTokens === b.distinctTokens) {
+            return a.subnet.localeCompare(b.subnet);
+          }
+          return b.distinctTokens - a.distinctTokens;
+        });
+
+      const data = JSON.stringify(
+        {
+          exportedAt: new Date().toISOString(),
+          ipv4Ranges,
+          ipv6Ranges,
+        },
+        null,
+        2
+      );
+
+      res.setHeader(
+        "Content-Disposition",
+        `attachment; filename=temp-ip-report-${new Date().toISOString()}.json`
+      );
+      res.setHeader("Content-Type", "application/json");
+      return res.send(data);
+    }
     default: {
       throw new HttpError(400, "Invalid action");
     }
   }
 
   req.session.flash = flash;
+  const referer = req.get("referer");
 
-  return res.redirect(`/admin/manage`);
+  return res.redirect(referer || "/admin/manage");
 });
 
 router.get("/download-stats", (_req, res) => {

src/admin/web/views/admin_anti-abuse.ejs

@@ -0,0 +1,160 @@
+<%- include("partials/shared_header", { title: "Proof of Work Verification Settings - OAI Reverse Proxy Admin" }) %>
+<style>
+  details {
+    margin-top: 1em;
+  }
+  details summary {
+    font-weight: bold;
+    cursor: pointer;
+  }
+  details p {
+    margin-left: 1em;
+  }
+
+  #token-manage {
+    display: flex;
+    width: 100%;
+  }
+  #token-manage button {
+    flex-grow: 1;
+    margin: 0 0.5em;
+  }
+</style>
+
+<h1>Abuse Mitigation Settings</h1>
+<div>
+  <h2>Proof-of-Work Verification</h2>
+  <p>
+    The Proof-of-Work difficulty level is used to determine how much work a client must perform to earn a temporary user
+    token. Higher difficulty levels require more work, which can help mitigate abuse by making it more expensive for
+    attackers to generate tokens. However, higher difficulty levels can also make it more difficult for legitimate users
+    to generate tokens. Refer to documentation for guidance.
+  </p>
+  <%if (captchaMode === "none") { %>
+  <p>
+    <strong>PoW verification is not enabled. Set <code>CAPTCHA_MODE=proof_of_work</code> to enable.</strong>
+  </p>
+  <% } else { %>
+  <h3>Difficulty Level</h3>
+  <div>
+    <label for="difficulty">Difficulty Level:</label>
+    <select name="difficulty" id="difficulty" onchange="difficultyChanged(event)">
+      <option value="low">Low</option>
+      <option value="medium">Medium</option>
+      <option value="high">High</option>
+      <option value="extreme">Extreme</option>
+      <option value="custom">Custom</option>
+    </select>
+    <div id="custom-difficulty-container" style="display: none">
+      <label for="customDifficulty">Hashes required (average):</label>
+      <input type="number" id="customDifficulty" value="0" min="1" max="1000000000" />
+    </div>
+    <button onclick='doAction("setDifficulty")'>Update Difficulty</button>
+  </div>
+  <div><span id="currentDifficulty">Current Difficulty: <%= difficulty %></span></div>
+  <% } %>
+  <form id="maintenanceForm" action="/admin/manage/maintenance" method="post">
+    <input id="_csrf" type="hidden" name="_csrf" value="<%= csrfToken %>" />
+    <input id="hiddenAction" type="hidden" name="action" value="" />
+    <input id="hiddenDifficulty" type="hidden" name="pow-difficulty" value="" />
+  </form>
+  <h3>Manage Temporary User Tokens</h3>
+  <div id="token-manage">
+    <p><button onclick='doAction("expireTempTokens")'>🕒 Expire All Temp Tokens</button></p>
+    <p><button onclick='doAction("cleanTempTokens")'>🧹 Delete Expired Temp Tokens</button></p>
+    <p><button onclick='doAction("generateTempIpReport")'>📊 Generate Temp Token IP Report</button></p>
+  </div>
+</div>
+<div>
+  <h2>IP Whitelists and Blacklists</h2>
+  <p>
+    You can specify IP ranges to whitelist or blacklist from accessing the proxy. Entries can be specified as single
+    addresses or
+    <a href="https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#CIDR_notation">CIDR notation</a>. IPv6 is
+    supported but not recommended for use with the current version of the proxy.
+  </p>
+  <p>
+    <strong>Note:</strong> Changes here are not persisted across server restarts. If you want to make changes permanent,
+    you can copy the values to your deployment configuration.
+  </p>
+  <% for (let i = 0; i < whitelists.length; i++) { %>
+  <%- include("partials/admin-cidr-widget", { list: whitelists[i] }) %>
+  <% } %>
+  <% for (let i = 0; i < blacklists.length; i++) { %>
+  <%- include("partials/admin-cidr-widget", { list: blacklists[i] }) %>
+  <% } %>
+  <form action="/admin/manage/cidr" method="post" id="cidrForm">
+    <input id="_csrf" type="hidden" name="_csrf" value="<%= csrfToken %>" />
+    <input type="hidden" name="action" value="add" />
+    <input type="hidden" name="name" value="" />
+    <input type="hidden" name="mode" value="" />
+    <input type="hidden" name="mask" value="" />
+  </form>
+  <details>
+    <summary>Copy environment variables</summary>
+    <p>
+      If you have made changes with the UI, you can copy the values below to your deployment configuration to persist
+      them across server restarts.
+    </p>
+    <pre>
+    <% for (let i = 0; i < whitelists.length; i++) { %><%= whitelists[i].name %>=<%= whitelists[i].ranges.join(",") %><% } %>
+    <% for (let i = 0; i < blacklists.length; i++) { %><%= blacklists[i].name %>=<%= blacklists[i].ranges.join(",") %><% } %>
+    </pre>
+  </details>
+</div>
+
+<script>
+  function difficultyChanged(event) {
+    const value = event.target.value;
+    if (value === "custom") {
+      document.getElementById("custom-difficulty-container").style.display = "block";
+    } else {
+      document.getElementById("custom-difficulty-container").style.display = "none";
+    }
+  }
+
+  function doAction(action) {
+    document.getElementById("hiddenAction").value = action;
+    if (action === "setDifficulty") {
+      const selected = document.getElementById("difficulty").value;
+      const hiddenDifficulty = document.getElementById("hiddenDifficulty");
+      if (selected === "custom") {
+        hiddenDifficulty.value = document.getElementById("customDifficulty").value;
+      } else {
+        hiddenDifficulty.value = selected;
+      }
+    }
+    document.getElementById("maintenanceForm").submit();
+  }
+
+  function onAddCidr(event) {
+    const list = event.target.dataset;
+    const newMask = prompt("Enter the IP or CIDR range to add to the list:");
+    if (!newMask) {
+      return;
+    }
+
+    const form = document.getElementById("cidrForm");
+    form["action"].value = "add";
+    form["name"].value = list.name;
+    form["mode"].value = list.mode;
+    form["mask"].value = newMask;
+    form.submit();
+  }
+
+  function onRemoveCidr(event) {
+    const list = event.target.dataset;
+    const removeMask = event.target.dataset.mask;
+    if (!removeMask) {
+      return;
+    }
+
+    const form = document.getElementById("cidrForm");
+    form["action"].value = "remove";
+    form["name"].value = list.name;
+    form["mode"].value = list.mode;
+    form["mask"].value = removeMask;
+    form.submit();
+  }
+</script>
+<%- include("partials/admin-footer") %>

src/admin/web/views/admin_create-user.ejs

@@ -51,9 +51,8 @@
     <legend>Temporary User Options</legend>
     <div class="temporary-user-fieldset">
       <p class="full-width">
-        Temporary users will be disabled after the specified duration, and their records will be deleted 72 hours after that.
-        These options apply only to new
-        temporary users; existing ones use whatever options were in effect when they were created.
+        Temporary users will be disabled after the specified duration, and their records will be permanently deleted after some time.
+        These options apply only to new temporary users; existing ones use whatever options were in effect when they were created.
       </p>
       <label for="temporaryUserDuration" class="full-width">Access duration (in minutes)</label>
       <input type="number" name="temporaryUserDuration" id="temporaryUserDuration" value="60" class="full-width" />

src/admin/web/views/admin_download-stats.ejs

@@ -5,18 +5,6 @@
     flex-direction: column;
   }
 
-  #statsForm div {
-    display: flex;
-    flex-direction: row;
-    margin-bottom: 0.5em;
-  }
-
-  #statsForm div label {
-    width: 6em;
-    text-align: right;
-    margin-right: 1em;
-  }
-
   #statsForm ul {
     margin: 0;
     padding-left: 2em;
@@ -33,17 +21,17 @@
   }
 </style>
 <h1>Download Stats</h1>
-<p>
-  Download usage statistics to a Markdown document. You can paste this into a service like Rentry.org to share it.
-</p>
+<p>Download usage statistics to a Markdown document. You can paste this into a service like Rentry.org to share it.</p>
 <div>
   <h3>Options</h3>
-  <form id="statsForm" action="/admin/manage/generate-stats" method="post"
-    style="display: flex; flex-direction: column;">
+  <form
+    id="statsForm"
+    action="/admin/manage/generate-stats"
+    method="post"
+    style="display: flex; flex-direction: column">
     <input id="_csrf" type="hidden" name="_csrf" value="<%= csrfToken %>" />
     <div>
-      <label for="anon">Anonymize</label>
-      <input id="anon" type="checkbox" name="anon" value="true" />
+      <label for="anon"><input id="anon" type="checkbox" name="anon" value="true" /> <span>Anonymize</span></label>
     </div>
     <div>
       <label for="sort">Sort</label>
@@ -64,11 +52,12 @@
       </select>
     </div>
     <div>
-      <label for="format">Custom Format <ul>
-          <li><code>{{header}}</code></li>
-          <li><code>{{stats}}</code></li>
-          <li><code>{{time}}</code></li>
-        </ul></label>
+      <label for="format">Custom Format</label>
+      <ul>
+        <li><code>{{header}}</code></li>
+        <li><code>{{stats}}</code></li>
+        <li><code>{{time}}</code></li>
+      </ul>
       <textarea id="format" name="format" rows="10" cols="50" placeholder="{{stats}}">
 # Stats
 {{header}}
@@ -115,33 +104,35 @@
   loadDefaults();
 
   async function fetchAndCopy() {
-    const form = document.getElementById('statsForm');
+    const form = document.getElementById("statsForm");
     const formData = new FormData(form);
 
     const response = await fetch(form.action, {
-      method: 'POST',
-      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-      credentials: 'same-origin',
+      method: "POST",
+      headers: { "Content-Type": "application/x-www-form-urlencoded" },
+      credentials: "same-origin",
       body: new URLSearchParams(formData),
     });
 
-
     if (response.ok) {
       const content = await response.text();
       copyToClipboard(content);
     } else {
-      throw new Error('Failed to fetch generated stats. Try reloading the page.');
+      throw new Error("Failed to fetch generated stats. Try reloading the page.");
     }
   }
 
   function copyToClipboard(text) {
-    navigator.clipboard.writeText(text).then(() => {
-      alert('Copied to clipboard');
-    }).catch(err => {
-      alert('Failed to copy to clipboard. Try downloading the file instead.');
-    });
+    navigator.clipboard
+      .writeText(text)
+      .then(() => {
+        alert("Copied to clipboard");
+      })
+      .catch((err) => {
+        alert("Failed to copy to clipboard. Try downloading the file instead.");
+      });
   }
 
-  document.getElementById('copyButton').addEventListener('click', fetchAndCopy);
+  document.getElementById("copyButton").addEventListener("click", fetchAndCopy);
 </script>
 <%- include("partials/admin-footer") %>

src/admin/web/views/admin_index.ejs

@@ -25,13 +25,14 @@
   <li><a href="/admin/manage/import-users">Import Users</a></li>
   <li><a href="/admin/manage/export-users">Export Users</a></li>
   <li><a href="/admin/manage/download-stats">Download Rentry Stats</a>
+  <li><a href="/admin/manage/anti-abuse">Abuse Mitigation Settings</a></li>
   <li><a href="/admin/service-info">Service Info</a></li>
 </ul>
 <h3>Maintenance</h3>
 <form id="maintenanceForm" action="/admin/manage/maintenance" method="post">
   <input id="_csrf" type="hidden" name="_csrf" value="<%= csrfToken %>" />
   <input id="hiddenAction" type="hidden" name="action" value="" />
-  <div display="flex" flex-direction="column">
+  <div>
     <fieldset>
       <legend>Key Recheck</legend>
       <button id="recheck-keys" type="button" onclick="submitForm('recheck')">Force Key Recheck</button>
@@ -42,7 +43,7 @@
       <legend>Bulk Quota Management</legend>
       <p>
         <button id="refresh-quotas" type="button" onclick="submitForm('resetQuotas')">Refresh All Quotas</button>
-        Resets all users' quotas to the values set in the <code>TOKEN_QUOTA_*</code> environment variables.
+        Immediately refreshes all users' quotas by the configured amounts.
       </p>
       <p>
         <button id="clear-token-counts" type="button" onclick="submitForm('resetCounts')">Clear All Token Counts</button>

src/admin/web/views/admin_list-users.ejs

@@ -4,9 +4,8 @@
     <% if (users.length === 0) { %>
     <p>No users found.</p>
     <% } else { %>
-    <input type="checkbox" id="toggle-nicknames" onchange="toggleNicknames()" />
-    <label for="toggle-nicknames">Show Nicknames</label>
-    <table class="striped">
+    <label for="toggle-nicknames"><input type="checkbox" id="toggle-nicknames" onchange="toggleNicknames()" /> Show Nicknames</label>
+    <table class="striped full-width">
       <thead>
         <tr>
           <th>User</th>

src/admin/web/views/admin_view-user.ejs

@@ -55,8 +55,9 @@
       <td><%- user.disabledReason %></td>
       <% if (user.disabledAt) { %>
       <td class="actions">
-        <a title="Edit" id="edit-disabledReason" href="#" data-field="disabledReason"
-          data-token="<%= user.token %>">✏️</a>
+        <a title="Edit" id="edit-disabledReason" href="#" data-field="disabledReason" data-token="<%= user.token %>"
+          >✏️</a
+        >
       </td>
       <% } %>
     </tr>
@@ -72,7 +73,8 @@
       <td colspan="2"><%- include("partials/shared_user_ip_list", { user, shouldRedact: false }) %></td>
     </tr>
     <tr>
-      <th scope="row">Admin Note <span title="Unlike nickname, this is not visible to or editable by the user">🔒</span>
+      <th scope="row">
+        Admin Note <span title="Unlike nickname, this is not visible to or editable by the user">🔒</span>
       </th>
       <td><%- user.adminNote ?? "none" %></td>
       <td class="actions">
@@ -85,14 +87,24 @@
       <td colspan="2"><%- user.expiresAt %></td>
     </tr>
     <% } %>
+    <% if (user.meta) { %>
+    <tr>
+      <th scope="row">Meta</th>
+      <td colspan="2"><%- JSON.stringify(user.meta) %></td>
+    </tr>
+    <% } %>
   </tbody>
 </table>
 
-<form style="display:none" id="current-values">
+<form style="display: none" id="current-values">
   <input type="hidden" name="token" value="<%- user.token %>" />
   <% ["nickname", "type", "disabledAt", "disabledReason", "maxIps", "adminNote"].forEach(function (key) { %>
   <input type="hidden" name="<%- key %>" value="<%- user[key] %>" />
   <% }); %>
+  <!-- tokenRefresh_ keys are dynamically generated -->
+  <% Object.entries(quota).forEach(([family]) => { %>
+  <input type="hidden" name="tokenRefresh_<%- family %>" value="<%- user.tokenRefresh[family] || quota[family] %>" />
+  <% }); %>
 </form>
 
 <h3>Quota Information</h3>
@@ -102,7 +114,8 @@
   <input type="hidden" name="_csrf" value="<%- csrfToken %>" />
   <button type="submit" class="btn btn-primary">Refresh Quotas for User</button>
 </form>
-<% } %> <%- include("partials/shared_quota-info", { quota, user }) %>
+<% } %>
+<%- include("partials/shared_quota-info", { quota, user, showRefreshEdit: true }) %>
 
 <p><a href="/admin/manage/list-users">Back to User List</a></p>
 
@@ -113,18 +126,25 @@
       const token = a.dataset.token;
       const field = a.dataset.field;
       const existingValue = document.querySelector(`#current-values input[name=${field}]`).value;
-      let value = prompt(`Enter new value for '${field}'':`, existingValue);
+
+      let value = prompt(`Enter new value for '${field}':`, existingValue);
       if (value !== null) {
         if (value === "") {
           value = null;
         }
+
+        const payload = { _csrf: document.querySelector("meta[name=csrf-token]").getAttribute("content") };
+        if (field.startsWith("tokenRefresh_")) {
+          const family = field.slice("tokenRefresh_".length);
+          payload.tokenRefresh = { [family]: Number(value) };
+        } else {
+          payload[field] = value;
+        }
+
         fetch(`/admin/manage/edit-user/${token}`, {
           method: "POST",
           credentials: "same-origin",
-          body: JSON.stringify({
-            [field]: value,
-            _csrf: document.querySelector("meta[name=csrf-token]").getAttribute("content"),
-          }),
+          body: JSON.stringify(payload),
           headers: { "Content-Type": "application/json", Accept: "application/json" },
         })
           .then((res) => Promise.all([res.ok, res.json()]))
@@ -132,9 +152,7 @@
             const url = new URL(window.location.href);
             const params = new URLSearchParams();
             if (!ok) {
-              params.set("flash", `error: ${json.error.message}`);
-            } else {
-              params.set("flash", `success: User's ${field} updated.`);
+              alert(`Failed to edit user: ${json.message}`);
             }
             url.search = params.toString();
             window.location.assign(url);
@@ -144,4 +162,5 @@
   });
 </script>
 
-<%- include("partials/admin-ban-xhr-script") %> <%- include("partials/admin-footer") %>
+<%- include("partials/admin-ban-xhr-script") %>
+<%- include("partials/admin-footer") %>

src/admin/web/views/partials/admin-cidr-widget.ejs

@@ -0,0 +1,13 @@
+<h3>
+  <%= list.name %>
+  (<%= list.mode %>)
+</h3>
+<ul>
+  <% list.ranges.forEach(function(mask) { %>
+  <li>
+    <%= mask %>
+    <button class="remove" data-mode="<%= list.mode %>" data-name="<%= list.name %>" data-mask="<%= mask %>" onclick="onRemoveCidr(event)">Remove</button>
+  </li>
+  <% }); %>
+</ul>
+<button class="add" data-mode="<%= list.mode %>" data-name="<%= list.name %>" onclick="onAddCidr(event)">Add</button>

src/config.ts

@@ -1,8 +1,9 @@
+import crypto from "crypto";
 import dotenv from "dotenv";
 import type firebase from "firebase-admin";
 import path from "path";
 import pino from "pino";
-import type { ModelFamily } from "./shared/models";
+import type { LLMService, ModelFamily } from "./shared/models";
 import { MODEL_FAMILIES } from "./shared/models";
 
 dotenv.config();
@@ -44,6 +45,13 @@ type Config = {
    * @example `AWS_CREDENTIALS=access_key_1:secret_key_1:us-east-1,access_key_2:secret_key_2:us-west-2`
    */
   awsCredentials?: string;
+  /**
+   * Comma-delimited list of GCP credentials. Each credential item should be a
+   * colon-delimited list of access key, secret key, and GCP region.
+   *
+   * @example `GCP_CREDENTIALS=project1:1@1.com:us-east5:-----BEGIN PRIVATE KEY-----xxx-----END PRIVATE KEY-----,project2:2@2.com:us-east5:-----BEGIN PRIVATE KEY-----xxx-----END PRIVATE KEY-----`
+   */
+  gcpCredentials?: string;
   /**
    * Comma-delimited list of Azure OpenAI credentials. Each credential item
    * should be a colon-delimited list of Azure resource name, deployment ID, and
@@ -107,9 +115,70 @@ type Config = {
    * `maxIpsPerUser` limit, or if only connections from new IPs are be rejected.
    */
   maxIpsAutoBan: boolean;
-  /** Per-IP limit for requests per minute to text and chat models. */
+  /**
+   * Which captcha verification mode to use. Requires `user_token` gatekeeper.
+   * Allows users to automatically obtain a token by solving a captcha.
+   * - `none`: No captcha verification; tokens are issued manually.
+   * - `proof_of_work`: Users must solve an Argon2 proof of work to obtain a
+   *    temporary usertoken valid for a limited period.
+   */
+  captchaMode: "none" | "proof_of_work";
+  /**
+   * Duration (in hours) for which a PoW-issued temporary user token is valid.
+   */
+  powTokenHours: number;
+  /**
+   * The maximum number of IPs from which a single temporary user token can be
+   * used. Upon reaching the limit, the `maxIpsAutoBan` behavior is triggered.
+   */
+  powTokenMaxIps: number;
+  /**
+   * Difficulty level for the proof-of-work challenge.
+   * - `low`: 200 iterations
+   * - `medium`: 900 iterations
+   * - `high`: 1900 iterations
+   * - `extreme`: 4000 iterations
+   * - `number`: A custom number of iterations to use.
+   *
+   * Difficulty level only affects the number of iterations used in the PoW,
+   * not the complexity of the hash itself. Therefore, the average time-to-solve
+   * will scale linearly with the number of iterations.
+   *
+   * Refer to docs/proof-of-work.md for guidance and hashrate benchmarks.
+   */
+  powDifficultyLevel: "low" | "medium" | "high" | "extreme" | number;
+  /**
+   * Duration (in minutes) before a PoW challenge expires. Users' browsers must
+   * solve the challenge within this time frame or it will be rejected. Should
+   * be kept somewhat low to prevent abusive clients from working on many
+   * challenges in parallel, but you may need to increase this value for higher
+   * difficulty levels or older devices will not be able to solve the challenge
+   * in time.
+   *
+   * Defaults to 30 minutes.
+   */
+  powChallengeTimeout: number;
+  /**
+   * Duration (in hours) before expired temporary user tokens are purged from
+   * the user database. Users can refresh expired tokens by solving a faster PoW
+   * challenge as long as the original token has not been purged. Once purged,
+   * the user must solve a full PoW challenge to obtain a new token.
+   *
+   * Defaults to 48 hours. At 0, tokens are purged immediately upon expiry.
+   */
+  powTokenPurgeHours: number;
+  /**
+   * Maximum number of active temporary user tokens that can be associated with
+   * a single IP address. Note that this may impact users sending requests from
+   * hosted AI chat clients such as Agnaistic or RisuAI, as they may share IPs.
+   *
+   * When the limit is reached, the oldest token with the same IP will be
+   * expired. At 0, no limit is enforced. Defaults to 0.
+   */
+  // powMaxTokensPerIp: number;
+  /** Per-user limit for requests per minute to text and chat models. */
   textModelRateLimit: number;
-  /** Per-IP limit for requests per minute to image generation models. */
+  /** Per-user limit for requests per minute to image generation models. */
   imageModelRateLimit: number;
   /**
    * For OpenAI, the maximum number of context tokens (prompt + max output) a
@@ -146,10 +215,38 @@ type Config = {
    * key and can't attach the policy, you can set this to true.
    */
   allowAwsLogging?: boolean;
+  /**
+   * Path to the SQLite database file for storing data such as event logs. By
+   * default, the database will be stored at `data/database.sqlite`.
+   *
+   * Ensure target is writable by the server process, and be careful not to
+   * select a path that is served publicly. The default path is safe.
+   */
+  sqliteDataPath?: string;
+  /**
+   * Whether to log events, such as generated completions, to the database.
+   * Events are associated with IP+user token pairs. If user_token mode is
+   * disabled, no events will be logged.
+   *
+   * Currently there is no pruning mechanism for the events table, so it will
+   * grow indefinitely. You may want to periodically prune the table manually.
+   */
+  eventLogging?: boolean;
+  /**
+   * When hashing prompt histories, how many messages to trim from the end.
+   * If zero, only the full prompt hash will be stored.
+   * If greater than zero, for each number N, a hash of the prompt with the
+   * last N messages removed will be stored.
+   *
+   * Experimental function, config may change in future versions.
+   */
+  eventLoggingTrim?: number;
   /** Whether prompts and responses should be logged to persistent storage. */
   promptLogging?: boolean;
   /** Which prompt logging backend to use. */
-  promptLoggingBackend?: "google_sheets";
+  promptLoggingBackend?: "google_sheets" | "file";
+  /** Prefix for prompt logging files when using the file backend. */
+  promptLoggingFilePrefix?: string;
   /** Base64-encoded Google Sheets API key. */
   googleSheetsKey?: string;
   /** Google Sheets spreadsheet ID. */
@@ -249,11 +346,75 @@ type Config = {
    * risk.
    */
   allowOpenAIToolUsage?: boolean;
+  /**
+   * Which services will accept prompts containing images, for use with
+   * multimodal models. Users with `special` role are exempt from this
+   * restriction.
+   *
+   * Do not enable this feature for untrusted users, as malicious users could
+   * send images which violate your provider's terms of service or local laws.
+   *
+   * Defaults to no services, meaning image prompts are disabled. Use a comma-
+   * separated list. Available services are:
+   * openai,anthropic,google-ai,mistral-ai,aws,gcp,azure
+   */
+  allowedVisionServices: LLMService[];
   /**
    * Allows overriding the default proxy endpoint route. Defaults to /proxy.
    * A leading slash is required.
    */
   proxyEndpointRoute: string;
+  /**
+   * If set, only requests from these IP addresses will be permitted to use the
+   * admin API and UI. Provide a comma-separated list of IP addresses or CIDR
+   * ranges. If not set, the admin API and UI will be open to all requests.
+   */
+  adminWhitelist: string[];
+  /**
+   * If set, requests from these IP addresses will be blocked from using the
+   * application. Provide a comma-separated list of IP addresses or CIDR ranges.
+   * If not set, no IP addresses will be blocked.
+   *
+   * Takes precedence over the adminWhitelist.
+   */
+  ipBlacklist: string[];
+  /**
+   * If set, pushes requests further back into the queue according to their
+   * token costs by factor*tokens*milliseconds (or more intuitively
+   * factor*thousands_of_tokens*seconds).
+   * Accepts floats.
+   */
+  tokensPunishmentFactor: number;
+  /**
+   * Configuration for HTTP requests made by the proxy to other servers, such
+   * as when checking keys or forwarding users' requests to external services.
+   * If not set, all requests will be made using the default agent.
+   *
+   * If set, the proxy may make requests to other servers using the specified
+   * settings. This is useful if you wish to route users' requests through
+   * another proxy or VPN, or if you have multiple network interfaces and want
+   * to use a specific one for outgoing requests.
+   */
+  httpAgent?: {
+    /**
+     * The name of the network interface to use. The first external IPv4 address
+     * belonging to this interface will be used for outgoing requests.
+     */
+    interface?: string;
+    /**
+     * The URL of a proxy server to use. Supports SOCKS4, SOCKS5, HTTP, and
+     * HTTPS. If not set, the proxy will be made using the default agent.
+     * - SOCKS4: `socks4://some-socks-proxy.com:9050`
+     * - SOCKS5: `socks5://username:password@some-socks-proxy.com:9050`
+     * - HTTP: `http://proxy-server-over-tcp.com:3128`
+     * - HTTPS: `https://proxy-server-over-tls.com:3129`
+     *
+     * **Note:** If your proxy server issues a certificate, you may need to set
+     * `NODE_EXTRA_CA_CERTS` to the path to your certificate, otherwise this
+     * application will reject TLS connections.
+     */
+    proxyUrl?: string;
+  };
 };
 
 // To change configs, create a file called .env in the root directory.
@@ -266,49 +427,48 @@ export const config: Config = {
   googleAIKey: getEnvWithDefault("GOOGLE_AI_KEY", ""),
   mistralAIKey: getEnvWithDefault("MISTRAL_AI_KEY", ""),
   awsCredentials: getEnvWithDefault("AWS_CREDENTIALS", ""),
+  gcpCredentials: getEnvWithDefault("GCP_CREDENTIALS", ""),
   azureCredentials: getEnvWithDefault("AZURE_CREDENTIALS", ""),
   proxyKey: getEnvWithDefault("PROXY_KEY", ""),
   adminKey: getEnvWithDefault("ADMIN_KEY", ""),
   serviceInfoPassword: getEnvWithDefault("SERVICE_INFO_PASSWORD", ""),
+  sqliteDataPath: getEnvWithDefault(
+    "SQLITE_DATA_PATH",
+    path.join(DATA_DIR, "database.sqlite")
+  ),
+  eventLogging: getEnvWithDefault("EVENT_LOGGING", false),
+  eventLoggingTrim: getEnvWithDefault("EVENT_LOGGING_TRIM", 5),
   gatekeeper: getEnvWithDefault("GATEKEEPER", "none"),
   gatekeeperStore: getEnvWithDefault("GATEKEEPER_STORE", "memory"),
   maxIpsPerUser: getEnvWithDefault("MAX_IPS_PER_USER", 0),
-  maxIpsAutoBan: getEnvWithDefault("MAX_IPS_AUTO_BAN", true),
+  maxIpsAutoBan: getEnvWithDefault("MAX_IPS_AUTO_BAN", false),
+  captchaMode: getEnvWithDefault("CAPTCHA_MODE", "none"),
+  powTokenHours: getEnvWithDefault("POW_TOKEN_HOURS", 24),
+  powTokenMaxIps: getEnvWithDefault("POW_TOKEN_MAX_IPS", 2),
+  powDifficultyLevel: getEnvWithDefault("POW_DIFFICULTY_LEVEL", "low"),
+  powChallengeTimeout: getEnvWithDefault("POW_CHALLENGE_TIMEOUT", 30),
+  powTokenPurgeHours: getEnvWithDefault("POW_TOKEN_PURGE_HOURS", 48),
   firebaseRtdbUrl: getEnvWithDefault("FIREBASE_RTDB_URL", undefined),
   firebaseKey: getEnvWithDefault("FIREBASE_KEY", undefined),
   textModelRateLimit: getEnvWithDefault("TEXT_MODEL_RATE_LIMIT", 4),
   imageModelRateLimit: getEnvWithDefault("IMAGE_MODEL_RATE_LIMIT", 4),
-  maxContextTokensOpenAI: getEnvWithDefault("MAX_CONTEXT_TOKENS_OPENAI", 16384),
+  maxContextTokensOpenAI: getEnvWithDefault("MAX_CONTEXT_TOKENS_OPENAI", 32768),
   maxContextTokensAnthropic: getEnvWithDefault(
     "MAX_CONTEXT_TOKENS_ANTHROPIC",
-    0
+    32768
   ),
   maxOutputTokensOpenAI: getEnvWithDefault(
     ["MAX_OUTPUT_TOKENS_OPENAI", "MAX_OUTPUT_TOKENS"],
-    400
+    1024
   ),
   maxOutputTokensAnthropic: getEnvWithDefault(
     ["MAX_OUTPUT_TOKENS_ANTHROPIC", "MAX_OUTPUT_TOKENS"],
-    400
+    1024
+  ),
+  allowedModelFamilies: getEnvWithDefault(
+    "ALLOWED_MODEL_FAMILIES",
+    getDefaultModelFamilies()
   ),
-  allowedModelFamilies: getEnvWithDefault("ALLOWED_MODEL_FAMILIES", [
-    "turbo",
-    "gpt4",
-    "gpt4-32k",
-    "gpt4-turbo",
-    "claude",
-    "claude-opus",
-    "gemini-pro",
-    "mistral-tiny",
-    "mistral-small",
-    "mistral-medium",
-    "mistral-large",
-    "aws-claude",
-    "azure-turbo",
-    "azure-gpt4",
-    "azure-gpt4-turbo",
-    "azure-gpt4-32k",
-  ]),
   rejectPhrases: parseCsv(getEnvWithDefault("REJECT_PHRASES", "")),
   rejectMessage: getEnvWithDefault(
     "REJECT_MESSAGE",
@@ -320,6 +480,10 @@ export const config: Config = {
   allowAwsLogging: getEnvWithDefault("ALLOW_AWS_LOGGING", false),
   promptLogging: getEnvWithDefault("PROMPT_LOGGING", false),
   promptLoggingBackend: getEnvWithDefault("PROMPT_LOGGING_BACKEND", undefined),
+  promptLoggingFilePrefix: getEnvWithDefault(
+    "PROMPT_LOGGING_FILE_PREFIX",
+    "prompt-logs"
+  ),
   googleSheetsKey: getEnvWithDefault("GOOGLE_SHEETS_KEY", undefined),
   googleSheetsSpreadsheetId: getEnvWithDefault(
     "GOOGLE_SHEETS_SPREADSHEET_ID",
@@ -348,20 +512,56 @@ export const config: Config = {
   staticServiceInfo: getEnvWithDefault("STATIC_SERVICE_INFO", false),
   trustedProxies: getEnvWithDefault("TRUSTED_PROXIES", 1),
   allowOpenAIToolUsage: getEnvWithDefault("ALLOW_OPENAI_TOOL_USAGE", false),
+  allowedVisionServices: parseCsv(
+    getEnvWithDefault("ALLOWED_VISION_SERVICES", "")
+  ) as LLMService[],
   proxyEndpointRoute: getEnvWithDefault("PROXY_ENDPOINT_ROUTE", "/proxy"),
+  adminWhitelist: parseCsv(
+    getEnvWithDefault("ADMIN_WHITELIST", "0.0.0.0/0,::/0")
+  ),
+  ipBlacklist: parseCsv(getEnvWithDefault("IP_BLACKLIST", "")),
+  tokensPunishmentFactor: getEnvWithDefault("TOKENS_PUNISHMENT_FACTOR", 0.0),
+  httpAgent: {
+    interface: getEnvWithDefault("HTTP_AGENT_INTERFACE", undefined),
+    proxyUrl: getEnvWithDefault("HTTP_AGENT_PROXY_URL", undefined),
+  },
 } as const;
 
-function generateCookieSecret() {
+function generateSigningKey() {
   if (process.env.COOKIE_SECRET !== undefined) {
+    // legacy, replaced by SIGNING_KEY
     return process.env.COOKIE_SECRET;
+  } else if (process.env.SIGNING_KEY !== undefined) {
+    return process.env.SIGNING_KEY;
   }
 
-  const seed = "" + config.adminKey + config.openaiKey + config.anthropicKey;
-  const crypto = require("crypto");
+  const secrets = [
+    config.adminKey,
+    config.openaiKey,
+    config.anthropicKey,
+    config.googleAIKey,
+    config.mistralAIKey,
+    config.awsCredentials,
+    config.gcpCredentials,
+    config.azureCredentials,
+  ];
+  if (secrets.filter((s) => s).length === 0) {
+    startupLogger.warn(
+      "No SIGNING_KEY or secrets are set. All sessions, cookies, and proofs of work will be invalidated on restart."
+    );
+    return crypto.randomBytes(32).toString("hex");
+  }
+
+  startupLogger.info("No SIGNING_KEY set; one will be generated from secrets.");
+  startupLogger.info(
+    "It's recommended to set SIGNING_KEY explicitly to ensure users' sessions and cookies always persist across restarts."
+  );
+  const seed = secrets.map((s) => s || "n/a").join("");
   return crypto.createHash("sha256").update(seed).digest("hex");
 }
 
-export const COOKIE_SECRET = generateCookieSecret();
+const signingKey = generateSigningKey();
+export const SECRET_SIGNING_KEY = signingKey;
 
 export async function assertConfigIsValid() {
   if (process.env.MODEL_RATE_LIMIT !== undefined) {
@@ -377,6 +577,23 @@ export async function assertConfigIsValid() {
     );
   }
 
+  if (process.env.ALLOW_IMAGE_PROMPTS === "true") {
+    const hasAllowedServices = config.allowedVisionServices.length > 0;
+    if (!hasAllowedServices) {
+      config.allowedVisionServices = ["openai", "anthropic"];
+      startupLogger.warn(
+        { allowedVisionServices: config.allowedVisionServices },
+        "ALLOW_IMAGE_PROMPTS is deprecated. Use ALLOWED_VISION_SERVICES instead."
+      );
+    }
+  }
+
+  if (config.promptLogging && !config.promptLoggingBackend) {
+    throw new Error(
+      "Prompt logging is enabled but no backend is configured. Set PROMPT_LOGGING_BACKEND to 'google_sheets' or 'file'."
+    );
+  }
+
   if (!["none", "proxy_key", "user_token"].includes(config.gatekeeper)) {
     throw new Error(
       `Invalid gatekeeper mode: ${config.gatekeeper}. Must be one of: none, proxy_key, user_token.`
@@ -389,15 +606,32 @@ export async function assertConfigIsValid() {
     );
   }
 
-  if (config.gatekeeper === "proxy_key" && !config.proxyKey) {
+  if (
+    config.captchaMode === "proof_of_work" &&
+    config.gatekeeper !== "user_token"
+  ) {
     throw new Error(
-      "`proxy_key` gatekeeper mode requires a `PROXY_KEY` to be set."
+      "Captcha mode 'proof_of_work' requires gatekeeper mode 'user_token'."
     );
   }
 
-  if (config.gatekeeper !== "proxy_key" && config.proxyKey) {
+  if (config.captchaMode === "proof_of_work") {
+    const val = config.powDifficultyLevel;
+    const isDifficulty =
+      typeof val === "string" &&
+      ["low", "medium", "high", "extreme"].includes(val);
+    const isIterations =
+      typeof val === "number" && Number.isInteger(val) && val > 0;
+    if (!isDifficulty && !isIterations) {
+      throw new Error(
+        "Invalid POW_DIFFICULTY_LEVEL. Must be one of: low, medium, high, extreme, or a positive integer."
+      );
+    }
+  }
+
+  if (config.gatekeeper === "proxy_key" && !config.proxyKey) {
     throw new Error(
-      "`PROXY_KEY` is set, but gatekeeper mode is not `proxy_key`. Make sure to set `GATEKEEPER=proxy_key`."
+      "`proxy_key` gatekeeper mode requires a `PROXY_KEY` to be set."
     );
   }
 
@@ -410,6 +644,16 @@ export async function assertConfigIsValid() {
     );
   }
 
+  if (Object.values(config.httpAgent || {}).filter(Boolean).length === 0) {
+    delete config.httpAgent;
+  } else if (config.httpAgent) {
+    if (config.httpAgent.interface && config.httpAgent.proxyUrl) {
+      throw new Error(
+        "Cannot set both `HTTP_AGENT_INTERFACE` and `HTTP_AGENT_PROXY_URL`."
+      );
+    }
+  }
+
   // Ensure forks which add new secret-like config keys don't unwittingly expose
   // them to users.
   for (const key of getKeys(config)) {
@@ -423,15 +667,16 @@ export async function assertConfigIsValid() {
         `Config key "${key}" may be sensitive but is exposed. Add it to SENSITIVE_KEYS or OMITTED_KEYS.`
       );
   }
-
-  await maybeInitializeFirebase();
 }
 
 /**
  * Config keys that are masked on the info page, but not hidden as their
  * presence may be relevant to the user due to privacy implications.
  */
-export const SENSITIVE_KEYS: (keyof Config)[] = ["googleSheetsSpreadsheetId"];
+export const SENSITIVE_KEYS: (keyof Config)[] = [
+  "googleSheetsSpreadsheetId",
+  "httpAgent",
+];
 
 /**
  * Config keys that are not displayed on the info page at all, generally because
@@ -446,6 +691,7 @@ export const OMITTED_KEYS = [
   "googleAIKey",
   "mistralAIKey",
   "awsCredentials",
+  "gcpCredentials",
   "azureCredentials",
   "proxyKey",
   "adminKey",
@@ -453,9 +699,13 @@ export const OMITTED_KEYS = [
   "rejectPhrases",
   "rejectMessage",
   "showTokenCosts",
+  "promptLoggingFilePrefix",
   "googleSheetsKey",
   "firebaseKey",
   "firebaseRtdbUrl",
+  "sqliteDataPath",
+  "eventLogging",
+  "eventLoggingTrim",
   "gatekeeperStore",
   "maxIpsPerUser",
   "blockedOrigins",
@@ -469,6 +719,9 @@ export const OMITTED_KEYS = [
   "allowedModelFamilies",
   "trustedProxies",
   "proxyEndpointRoute",
+  "adminWhitelist",
+  "ipBlacklist",
+  "powTokenPurgeHours",
 ] satisfies (keyof Config)[];
 type OmitKeys = (typeof OMITTED_KEYS)[number];
 
@@ -529,6 +782,7 @@ function getEnvWithDefault<T>(env: string | string[], defaultValue: T): T {
         "ANTHROPIC_KEY",
         "GOOGLE_AI_KEY",
         "AWS_CREDENTIALS",
+        "GCP_CREDENTIALS",
         "AZURE_CREDENTIALS",
       ].includes(String(env))
     ) {
@@ -546,32 +800,6 @@ function getEnvWithDefault<T>(env: string | string[], defaultValue: T): T {
   }
 }
 
-let firebaseApp: firebase.app.App | undefined;
-
-async function maybeInitializeFirebase() {
-  if (!config.gatekeeperStore.startsWith("firebase")) {
-    return;
-  }
-
-  const firebase = await import("firebase-admin");
-  const firebaseKey = Buffer.from(config.firebaseKey!, "base64").toString();
-  const app = firebase.initializeApp({
-    credential: firebase.credential.cert(JSON.parse(firebaseKey)),
-    databaseURL: config.firebaseRtdbUrl,
-  });
-
-  await app.database().ref("connection-test").set(Date.now());
-
-  firebaseApp = app;
-}
-
-export function getFirebaseApp(): firebase.app.App {
-  if (!firebaseApp) {
-    throw new Error("Firebase app not initialized.");
-  }
-  return firebaseApp;
-}
-
 function parseCsv(val: string): string[] {
   if (!val) return [];
 
@@ -579,3 +807,9 @@ function parseCsv(val: string): string[] {
   const matches = val.match(regex) || [];
   return matches.map((item) => item.replace(/^"|"$/g, "").trim());
 }
+
+function getDefaultModelFamilies(): ModelFamily[] {
+  return MODEL_FAMILIES.filter(
+    (f) => !f.includes("dall-e") && !f.includes("o1")
+  ) as ModelFamily[];
+}

src/info-page.ts

@@ -12,29 +12,44 @@ import { checkCsrfToken, injectCsrfToken } from "./shared/inject-csrf";
 
 const INFO_PAGE_TTL = 2000;
 const MODEL_FAMILY_FRIENDLY_NAME: { [f in ModelFamily]: string } = {
-  turbo: "GPT-3.5 Turbo",
+  turbo: "GPT-4o Mini / 3.5 Turbo",
   gpt4: "GPT-4",
   "gpt4-32k": "GPT-4 32k",
   "gpt4-turbo": "GPT-4 Turbo",
+  gpt4o: "GPT-4o",
+  o1: "OpenAI o1",
+  "o1-mini": "OpenAI o1 mini",
   "dall-e": "DALL-E",
   claude: "Claude (Sonnet)",
   "claude-opus": "Claude (Opus)",
+  "gemini-flash": "Gemini Flash",
   "gemini-pro": "Gemini Pro",
+  "gemini-ultra": "Gemini Ultra",
   "mistral-tiny": "Mistral 7B",
-  "mistral-small": "Mixtral Small", // Originally 8x7B, but that now refers to the older open-weight version. Mixtral Small is a newer closed-weight update to the 8x7B model.
+  "mistral-small": "Mistral Nemo",
   "mistral-medium": "Mistral Medium",
   "mistral-large": "Mistral Large",
   "aws-claude": "AWS Claude (Sonnet)",
+  "aws-claude-opus": "AWS Claude (Opus)",
+  "aws-mistral-tiny": "AWS Mistral 7B",
+  "aws-mistral-small": "AWS Mistral Nemo",
+  "aws-mistral-medium": "AWS Mistral Medium",
+  "aws-mistral-large": "AWS Mistral Large",
+  "gcp-claude": "GCP Claude (Sonnet)",
+  "gcp-claude-opus": "GCP Claude (Opus)",
   "azure-turbo": "Azure GPT-3.5 Turbo",
   "azure-gpt4": "Azure GPT-4",
   "azure-gpt4-32k": "Azure GPT-4 32k",
   "azure-gpt4-turbo": "Azure GPT-4 Turbo",
+  "azure-gpt4o": "Azure GPT-4o",
+  "azure-o1": "Azure o1",
+  "azure-o1-mini": "Azure o1 mini",
   "azure-dall-e": "Azure DALL-E",
 };
 
 const converter = new showdown.Converter();
 const customGreeting = fs.existsSync("greeting.md")
-  ? `\n## Server Greeting\n${fs.readFileSync("greeting.md", "utf8")}`
+  ? `<div id="servergreeting">${fs.readFileSync("greeting.md", "utf8")}</div>`
   : "";
 let infoPageHtml: string | undefined;
 let infoPageLastUpdated = 0;
@@ -60,36 +75,42 @@ export function renderPage(info: ServiceInfo) {
   const title = getServerTitle();
   const headerHtml = buildInfoPageHeader(info);
 
-  return `<!DOCTYPE html>
+  return `<!doctype html>
 <html lang="en">
   <head>
     <meta charset="utf-8" />
     <meta name="robots" content="noindex" />
     <title>${title}</title>
+    <link rel="stylesheet" href="/res/css/reset.css" media="screen" />
+    <link rel="stylesheet" href="/res/css/sakura.css" media="screen" />
+    <link rel="stylesheet" href="/res/css/sakura-dark.css" media="screen and (prefers-color-scheme: dark)" />
     <style>
       body {
         font-family: sans-serif;
-        background-color: #f0f0f0;
         padding: 1em;
+        max-width: 900px;
+        margin: 0;
       }
-      @media (prefers-color-scheme: dark) {
-        body {
-          background-color: #222;
-          color: #eee;
-        }
-        
-        a:link, a:visited {
-          color: #bbe;
-        }
+      
+      .self-service-links {
+        display: flex;
+        justify-content: center;
+        margin-bottom: 1em;
+        padding: 0.5em;
+        font-size: 0.8em;
+      }
+      
+      .self-service-links a {
+        margin: 0 0.5em;
       }
     </style>
   </head>
   <body>
     ${headerHtml}
     <hr />
+    ${getSelfServiceLinks()}
     <h2>Service Info</h2>
     <pre>${JSON.stringify(info, null, 2)}</pre>
-    ${getSelfServiceLinks()}
   </body>
 </html>`;
 }
@@ -143,7 +164,15 @@ This proxy keeps full logs of all prompts and AI responses. Prompt logs are anon
 
 function getSelfServiceLinks() {
   if (config.gatekeeper !== "user_token") return "";
-  return `<footer style="font-size: 0.8em;"><hr /><a target="_blank" href="/user/lookup">Check your user token info</a></footer>`;
+
+  const links = [["Check your user token", "/user/lookup"]];
+  if (config.captchaMode !== "none") {
+    links.unshift(["Request a user token", "/user/captcha"]);
+  }
+
+  return `<div class="self-service-links">${links
+    .map(([text, link]) => `<a href="${link}">${text}</a>`)
+    .join(" | ")}</div>`;
 }
 
 function getServerTitle() {
@@ -190,7 +219,7 @@ function buildRecentImageSection() {
 </div>`;
   }
   html += `</div>`;
-  html += `<p style="clear: both; text-align: center;"><a href="/user/image-history">View all recent images</a></p>`
+  html += `<p style="clear: both; text-align: center;"><a href="/user/image-history">View all recent images</a></p>`;
 
   return html;
 }
@@ -201,7 +230,9 @@ function escapeHtml(unsafe: string) {
     .replace(/</g, "&lt;")
     .replace(/>/g, "&gt;")
     .replace(/"/g, "&quot;")
-    .replace(/'/g, "&#39;");
+    .replace(/'/g, "&#39;")
+    .replace(/\[/g, "&#91;")
+    .replace(/]/g, "&#93;");
 }
 
 function getExternalUrlForHuggingfaceSpaceId(spaceId: string) {

src/proxy/add-v1.ts

@@ -0,0 +1,9 @@
+import { NextFunction, Request, Response } from "express";
+
+export function addV1(req: Request, res: Response, next: NextFunction) {
+  // Clients don't consistently use the /v1 prefix so we'll add it for them.
+  if (!req.path.startsWith("/v1/") && !req.path.startsWith("/v1beta/")) {
+    req.url = `/v1${req.url}`;
+  }
+  next();
+}

src/proxy/anthropic.ts

@@ -1,22 +1,14 @@
-import { Request, Response, RequestHandler, Router } from "express";
-import { createProxyMiddleware } from "http-proxy-middleware";
+import { Request, RequestHandler, Router } from "express";
 import { config } from "../config";
-import { logger } from "../logger";
-import { createQueueMiddleware } from "./queue";
 import { ipLimiter } from "./rate-limit";
-import { handleProxyError } from "./middleware/common";
 import {
   addKey,
-  addAnthropicPreamble,
   createPreprocessorMiddleware,
   finalizeBody,
-  createOnProxyReqHandler,
 } from "./middleware/request";
-import {
-  ProxyResHandlerWithBody,
-  createOnProxyResHandler,
-} from "./middleware/response";
-import { sendErrorToClient } from "./middleware/response/error-generator";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
+import { ProxyReqManager } from "./middleware/request/proxy-req-manager";
 
 let modelsCache: any = null;
 let modelsCacheTime = 0;
@@ -44,8 +36,13 @@ const getModelsResponse = () => {
     "claude-2.0",
     "claude-2.1",
     "claude-3-haiku-20240307",
+    "claude-3-5-haiku-20241022",
     "claude-3-opus-20240229",
+    "claude-3-opus-latest",
     "claude-3-sonnet-20240229",
+    "claude-3-5-sonnet-20240620",
+    "claude-3-5-sonnet-20241022",
+    "claude-3-5-sonnet-latest",
   ];
 
   const models = claudeVariants.map((id) => ({
@@ -68,8 +65,7 @@ const handleModelRequest: RequestHandler = (_req, res) => {
   res.status(200).json(getModelsResponse());
 };
 
-/** Only used for non-streaming requests. */
-const anthropicResponseHandler: ProxyResHandlerWithBody = async (
+const anthropicBlockingResponseHandler: ProxyResHandlerWithBody = async (
   _proxyRes,
   req,
   res,
@@ -122,12 +118,6 @@ export function transformAnthropicChatResponseToAnthropicText(
   };
 }
 
-/**
- * Transforms a model response from the Anthropic API to match those from the
- * OpenAI API, for users using Claude via the OpenAI-compatible endpoint. This
- * is only used for non-streaming requests as streaming requests are handled
- * on-the-fly.
- */
 function transformAnthropicTextResponseToOpenAI(
   anthropicBody: Record<string, any>,
   req: Request
@@ -156,7 +146,7 @@ function transformAnthropicTextResponseToOpenAI(
   };
 }
 
-function transformAnthropicChatResponseToOpenAI(
+export function transformAnthropicChatResponseToOpenAI(
   anthropicBody: Record<string, any>
 ): Record<string, any> {
   return {
@@ -178,40 +168,59 @@ function transformAnthropicChatResponseToOpenAI(
   };
 }
 
-const anthropicProxy = createQueueMiddleware({
-  proxyMiddleware: createProxyMiddleware({
-    target: "https://api.anthropic.com",
-    changeOrigin: true,
-    selfHandleResponse: true,
-    logger,
-    on: {
-      proxyReq: createOnProxyReqHandler({
-        pipeline: [addKey, addAnthropicPreamble, finalizeBody],
-      }),
-      proxyRes: createOnProxyResHandler([anthropicResponseHandler]),
-      error: handleProxyError,
-    },
-    // Abusing pathFilter to rewrite the paths dynamically.
-    pathFilter: (pathname, req) => {
-      const isText = req.outboundApi === "anthropic-text";
-      const isChat = req.outboundApi === "anthropic-chat";
-      if (isChat && pathname === "/v1/complete") {
-        req.url = "/v1/messages";
-      }
-      if (isText && pathname === "/v1/chat/completions") {
-        req.url = "/v1/complete";
-      }
-      if (isChat && pathname === "/v1/chat/completions") {
-        req.url = "/v1/messages";
-      }
-      if (isChat && ["sonnet", "opus"].includes(req.params.type)) {
-        req.url = "/v1/messages";
-      }
-      return true;
-    },
-  }),
+/**
+ * If a client using the OpenAI compatibility endpoint requests an actual OpenAI
+ * model, reassigns it to Sonnet.
+ */
+function maybeReassignModel(req: Request) {
+  const model = req.body.model;
+  if (model.includes("claude")) return; // use whatever model the user requested
+  req.body.model = "claude-3-5-sonnet-latest";
+}
+
+/**
+ * If client requests more than 4096 output tokens the request must have a
+ * particular version header.
+ * https://docs.anthropic.com/en/release-notes/api#july-15th-2024
+ */
+function setAnthropicBetaHeader(req: Request) {
+  const { max_tokens_to_sample } = req.body;
+  if (max_tokens_to_sample > 4096) {
+    req.headers["anthropic-beta"] = "max-tokens-3-5-sonnet-2024-07-15";
+  }
+}
+
+function selectUpstreamPath(manager: ProxyReqManager) {
+  const req = manager.request;
+  const pathname = req.url.split("?")[0];
+  req.log.debug({ pathname }, "Anthropic path filter");
+  const isText = req.outboundApi === "anthropic-text";
+  const isChat = req.outboundApi === "anthropic-chat";
+  if (isChat && pathname === "/v1/complete") {
+    manager.setPath("/v1/messages");
+  }
+  if (isText && pathname === "/v1/chat/completions") {
+    manager.setPath("/v1/complete");
+  }
+  if (isChat && pathname === "/v1/chat/completions") {
+    manager.setPath("/v1/messages");
+  }
+  if (isChat && ["sonnet", "opus"].includes(req.params.type)) {
+    manager.setPath("/v1/messages");
+  }
+}
+
+const anthropicProxy = createQueuedProxyMiddleware({
+  target: "https://api.anthropic.com",
+  mutations: [selectUpstreamPath, addKey, finalizeBody],
+  blockingResponseHandler: anthropicBlockingResponseHandler,
 });
 
+const nativeAnthropicChatPreprocessor = createPreprocessorMiddleware(
+  { inApi: "anthropic-chat", outApi: "anthropic-chat", service: "anthropic" },
+  { afterTransform: [setAnthropicBetaHeader] }
+);
+
 const nativeTextPreprocessor = createPreprocessorMiddleware({
   inApi: "anthropic-text",
   outApi: "anthropic-text",
@@ -267,11 +276,7 @@ anthropicRouter.get("/v1/models", handleModelRequest);
 anthropicRouter.post(
   "/v1/messages",
   ipLimiter,
-  createPreprocessorMiddleware({
-    inApi: "anthropic-chat",
-    outApi: "anthropic-chat",
-    service: "anthropic",
-  }),
+  nativeAnthropicChatPreprocessor,
   anthropicProxy
 );
 // Anthropic text completion endpoint. Translates to Anthropic chat completion
@@ -291,65 +296,5 @@ anthropicRouter.post(
   preprocessOpenAICompatRequest,
   anthropicProxy
 );
-// Temporarily force Anthropic Text to Anthropic Chat for frontends which do not
-// yet support the new model. Forces claude-3. Will be removed once common
-// frontends have been updated.
-anthropicRouter.post(
-  "/v1/:type(sonnet|opus)/:action(complete|messages)",
-  ipLimiter,
-  handleAnthropicTextCompatRequest,
-  createPreprocessorMiddleware({
-    inApi: "anthropic-text",
-    outApi: "anthropic-chat",
-    service: "anthropic",
-  }),
-  anthropicProxy
-);
-
-function handleAnthropicTextCompatRequest(
-  req: Request,
-  res: Response,
-  next: any
-) {
-  const type = req.params.type;
-  const action = req.params.action;
-  const alreadyInChatFormat = Boolean(req.body.messages);
-  const compatModel = `claude-3-${type}-20240229`;
-  req.log.info(
-    { type, inputModel: req.body.model, compatModel, alreadyInChatFormat },
-    "Handling Anthropic compatibility request"
-  );
-
-  if (action === "messages" || alreadyInChatFormat) {
-    return sendErrorToClient({
-      req,
-      res,
-      options: {
-        title: "Unnecessary usage of compatibility endpoint",
-        message: `Your client seems to already support the new Claude API format. This endpoint is intended for clients that do not yet support the new format.\nUse the normal \`/anthropic\` proxy endpoint instead.`,
-        format: "unknown",
-        statusCode: 400,
-        reqId: req.id,
-        obj: {
-          requested_endpoint: "/anthropic/" + type,
-          correct_endpoint: "/anthropic",
-        },
-      },
-    });
-  }
-
-  req.body.model = compatModel;
-  next();
-}
-
-/**
- * If a client using the OpenAI compatibility endpoint requests an actual OpenAI
- * model, reassigns it to Claude 3 Sonnet.
- */
-function maybeReassignModel(req: Request) {
-  const model = req.body.model;
-  if (!model.startsWith("gpt-")) return;
-  req.body.model = "claude-3-sonnet-20240229";
-}
 
 export const anthropic = anthropicRouter;

src/proxy/aws-claude.ts

@@ -0,0 +1,257 @@
+import { Request, RequestHandler, Router } from "express";
+import { v4 } from "uuid";
+import {
+  transformAnthropicChatResponseToAnthropicText,
+  transformAnthropicChatResponseToOpenAI,
+} from "./anthropic";
+import { ipLimiter } from "./rate-limit";
+import {
+  createPreprocessorMiddleware,
+  finalizeSignedRequest,
+  signAwsRequest,
+} from "./middleware/request";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
+
+const awsBlockingResponseHandler: ProxyResHandlerWithBody = async (
+  _proxyRes,
+  req,
+  res,
+  body
+) => {
+  if (typeof body !== "object") {
+    throw new Error("Expected body to be an object");
+  }
+
+  let newBody = body;
+  switch (`${req.inboundApi}<-${req.outboundApi}`) {
+    case "openai<-anthropic-text":
+      req.log.info("Transforming Anthropic Text back to OpenAI format");
+      newBody = transformAwsTextResponseToOpenAI(body, req);
+      break;
+    case "openai<-anthropic-chat":
+      req.log.info("Transforming AWS Anthropic Chat back to OpenAI format");
+      newBody = transformAnthropicChatResponseToOpenAI(body);
+      break;
+    case "anthropic-text<-anthropic-chat":
+      req.log.info("Transforming AWS Anthropic Chat back to Text format");
+      newBody = transformAnthropicChatResponseToAnthropicText(body);
+      break;
+  }
+
+  // AWS does not always confirm the model in the response, so we have to add it
+  if (!newBody.model && req.body.model) {
+    newBody.model = req.body.model;
+  }
+
+  res.status(200).json({ ...newBody, proxy: body.proxy });
+};
+
+function transformAwsTextResponseToOpenAI(
+  awsBody: Record<string, any>,
+  req: Request
+): Record<string, any> {
+  const totalTokens = (req.promptTokens ?? 0) + (req.outputTokens ?? 0);
+  return {
+    id: "aws-" + v4(),
+    object: "chat.completion",
+    created: Date.now(),
+    model: req.body.model,
+    usage: {
+      prompt_tokens: req.promptTokens,
+      completion_tokens: req.outputTokens,
+      total_tokens: totalTokens,
+    },
+    choices: [
+      {
+        message: {
+          role: "assistant",
+          content: awsBody.completion?.trim(),
+        },
+        finish_reason: awsBody.stop_reason,
+        index: 0,
+      },
+    ],
+  };
+}
+
+const awsClaudeProxy = createQueuedProxyMiddleware({
+  target: ({ signedRequest }) => {
+    if (!signedRequest) throw new Error("Must sign request before proxying");
+    return `${signedRequest.protocol}//${signedRequest.hostname}`;
+  },
+  mutations: [signAwsRequest, finalizeSignedRequest],
+  blockingResponseHandler: awsBlockingResponseHandler,
+});
+
+const nativeTextPreprocessor = createPreprocessorMiddleware(
+  { inApi: "anthropic-text", outApi: "anthropic-text", service: "aws" },
+  { afterTransform: [maybeReassignModel] }
+);
+
+const textToChatPreprocessor = createPreprocessorMiddleware(
+  { inApi: "anthropic-text", outApi: "anthropic-chat", service: "aws" },
+  { afterTransform: [maybeReassignModel] }
+);
+
+/**
+ * Routes text completion prompts to aws anthropic-chat if they need translation
+ * (claude-3 based models do not support the old text completion endpoint).
+ */
+const preprocessAwsTextRequest: RequestHandler = (req, res, next) => {
+  if (req.body.model?.includes("claude-3")) {
+    textToChatPreprocessor(req, res, next);
+  } else {
+    nativeTextPreprocessor(req, res, next);
+  }
+};
+
+const oaiToAwsTextPreprocessor = createPreprocessorMiddleware(
+  { inApi: "openai", outApi: "anthropic-text", service: "aws" },
+  { afterTransform: [maybeReassignModel] }
+);
+
+const oaiToAwsChatPreprocessor = createPreprocessorMiddleware(
+  { inApi: "openai", outApi: "anthropic-chat", service: "aws" },
+  { afterTransform: [maybeReassignModel] }
+);
+
+/**
+ * Routes an OpenAI prompt to either the legacy Claude text completion endpoint
+ * or the new Claude chat completion endpoint, based on the requested model.
+ */
+const preprocessOpenAICompatRequest: RequestHandler = (req, res, next) => {
+  if (req.body.model?.includes("claude-3")) {
+    oaiToAwsChatPreprocessor(req, res, next);
+  } else {
+    oaiToAwsTextPreprocessor(req, res, next);
+  }
+};
+
+const awsClaudeRouter = Router();
+// Native(ish) Anthropic text completion endpoint.
+awsClaudeRouter.post(
+  "/v1/complete",
+  ipLimiter,
+  preprocessAwsTextRequest,
+  awsClaudeProxy
+);
+// Native Anthropic chat completion endpoint.
+awsClaudeRouter.post(
+  "/v1/messages",
+  ipLimiter,
+  createPreprocessorMiddleware(
+    { inApi: "anthropic-chat", outApi: "anthropic-chat", service: "aws" },
+    { afterTransform: [maybeReassignModel] }
+  ),
+  awsClaudeProxy
+);
+
+// OpenAI-to-AWS Anthropic compatibility endpoint.
+awsClaudeRouter.post(
+  "/v1/chat/completions",
+  ipLimiter,
+  preprocessOpenAICompatRequest,
+  awsClaudeProxy
+);
+
+/**
+ * Tries to deal with:
+ * - frontends sending AWS model names even when they want to use the OpenAI-
+ *   compatible endpoint
+ * - frontends sending Anthropic model names that AWS doesn't recognize
+ * - frontends sending OpenAI model names because they expect the proxy to
+ *   translate them
+ *
+ * If client sends AWS model ID it will be used verbatim. Otherwise, various
+ * strategies are used to try to map a non-AWS model name to AWS model ID.
+ */
+function maybeReassignModel(req: Request) {
+  const model = req.body.model;
+
+  // If it looks like an AWS model, use it as-is
+  if (model.includes("anthropic.claude")) {
+    return;
+  }
+
+  // Anthropic model names can look like:
+  // - claude-v1
+  // - claude-2.1
+  // - claude-3-5-sonnet-20240620
+  // - claude-3-opus-latest
+  const pattern =
+    /^(claude-)?(instant-)?(v)?(\d+)([.-](\d))?(-\d+k)?(-sonnet-|-opus-|-haiku-)?(latest|\d*)/i;
+  const match = model.match(pattern);
+
+  if (!match) {
+    throw new Error(`Provided model name (${model}) doesn't resemble a Claude model ID.`);
+  }
+
+  const [_, _cl, instant, _v, major, _sep, minor, _ctx, rawName, rev] = match;
+
+  if (instant) {
+    req.body.model = "anthropic.claude-instant-v1";
+    return;
+  }
+
+  const ver = minor ? `${major}.${minor}` : major;
+  const name = rawName?.match(/([a-z]+)/)?.[1] || "";
+
+  switch (ver) {
+    case "1":
+    case "1.0":
+      req.body.model = "anthropic.claude-v1";
+      return;
+    case "2":
+    case "2.0":
+      req.body.model = "anthropic.claude-v2";
+      return;
+    case "2.1":
+      req.body.model = "anthropic.claude-v2:1";
+      return;
+    case "3":
+    case "3.0":
+      // there is only one snapshot for all Claude 3 models so there is no need
+      // to check the revision
+      switch (name) {
+        case "sonnet":
+          req.body.model = "anthropic.claude-3-sonnet-20240229-v1:0";
+          return;
+        case "haiku":
+          req.body.model = "anthropic.claude-3-haiku-20240307-v1:0";
+          return;
+        case "opus":
+          req.body.model = "anthropic.claude-3-opus-20240229-v1:0";
+          return;
+      }
+      break;
+    case "3.5":
+      switch (name) {
+        case "sonnet":
+          switch (rev) {
+            case "20241022":
+            case "latest":
+              req.body.model = "anthropic.claude-3-5-sonnet-20241022-v2:0";
+              return;
+            case "20240620":
+              req.body.model = "anthropic.claude-3-5-sonnet-20240620-v1:0";
+              return;
+          }
+          break;
+        case "haiku":
+          switch (rev) {
+            case "20241022":
+            case "latest":
+              req.body.model = "anthropic.claude-3-5-haiku-20241022-v1:0";
+              return;
+          }
+        case "opus":
+          // Add after model id is announced never
+          break;
+      }
+  }
+
+  throw new Error(`Provided model name (${model}) could not be mapped to a known AWS Claude model ID.`);
+}
+
+export const awsClaude = awsClaudeRouter;

src/proxy/aws-mistral.ts

@@ -0,0 +1,95 @@
+import { Request, Router } from "express";
+import {
+  detectMistralInputApi,
+  transformMistralTextToMistralChat,
+} from "./mistral-ai";
+import { ipLimiter } from "./rate-limit";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import {
+  createPreprocessorMiddleware,
+  finalizeSignedRequest,
+  signAwsRequest,
+} from "./middleware/request";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
+
+const awsMistralBlockingResponseHandler: ProxyResHandlerWithBody = async (
+  _proxyRes,
+  req,
+  res,
+  body
+) => {
+  if (typeof body !== "object") {
+    throw new Error("Expected body to be an object");
+  }
+
+  let newBody = body;
+  if (req.inboundApi === "mistral-ai" && req.outboundApi === "mistral-text") {
+    newBody = transformMistralTextToMistralChat(body);
+  }
+  // AWS does not always confirm the model in the response, so we have to add it
+  if (!newBody.model && req.body.model) {
+    newBody.model = req.body.model;
+  }
+
+  res.status(200).json({ ...newBody, proxy: body.proxy });
+};
+
+const awsMistralProxy = createQueuedProxyMiddleware({
+  target: ({ signedRequest }) => {
+    if (!signedRequest) throw new Error("Must sign request before proxying");
+    return `${signedRequest.protocol}//${signedRequest.hostname}`;
+  },
+  mutations: [signAwsRequest,finalizeSignedRequest],
+  blockingResponseHandler: awsMistralBlockingResponseHandler,
+});
+
+function maybeReassignModel(req: Request) {
+  const model = req.body.model;
+
+  // If it looks like an AWS model, use it as-is
+  if (model.startsWith("mistral.")) {
+    return;
+  }
+  // Mistral 7B Instruct
+  else if (model.includes("7b")) {
+    req.body.model = "mistral.mistral-7b-instruct-v0:2";
+  }
+  // Mistral 8x7B Instruct
+  else if (model.includes("8x7b")) {
+    req.body.model = "mistral.mixtral-8x7b-instruct-v0:1";
+  }
+  // Mistral Large (Feb 2024)
+  else if (model.includes("large-2402")) {
+    req.body.model = "mistral.mistral-large-2402-v1:0";
+  }
+  // Mistral Large 2 (July 2024)
+  else if (model.includes("large")) {
+    req.body.model = "mistral.mistral-large-2407-v1:0";
+  }
+  // Mistral Small (Feb 2024)
+  else if (model.includes("small")) {
+    req.body.model = "mistral.mistral-small-2402-v1:0";
+  } else {
+    throw new Error(
+      `Can't map '${model}' to a supported AWS model ID; make sure you are requesting a Mistral model supported by Amazon Bedrock`
+    );
+  }
+}
+
+const nativeMistralChatPreprocessor = createPreprocessorMiddleware(
+  { inApi: "mistral-ai", outApi: "mistral-ai", service: "aws" },
+  {
+    beforeTransform: [detectMistralInputApi],
+    afterTransform: [maybeReassignModel],
+  }
+);
+
+const awsMistralRouter = Router();
+awsMistralRouter.post(
+  "/v1/chat/completions",
+  ipLimiter,
+  nativeMistralChatPreprocessor,
+  awsMistralProxy
+);
+
+export const awsMistral = awsMistralRouter;

src/proxy/aws.ts

@@ -1,307 +1,77 @@
-import { Request, RequestHandler, Response, Router } from "express";
-import { createProxyMiddleware } from "http-proxy-middleware";
-import { v4 } from "uuid";
+/* Shared code between AWS Claude and AWS Mistral endpoints. */
+
+import { Request, Response, Router } from "express";
 import { config } from "../config";
-import { logger } from "../logger";
-import { createQueueMiddleware } from "./queue";
-import { ipLimiter } from "./rate-limit";
-import { handleProxyError } from "./middleware/common";
-import {
-  createPreprocessorMiddleware,
-  signAwsRequest,
-  finalizeSignedRequest,
-  createOnProxyReqHandler,
-} from "./middleware/request";
-import {
-  ProxyResHandlerWithBody,
-  createOnProxyResHandler,
-} from "./middleware/response";
-import { transformAnthropicChatResponseToAnthropicText } from "./anthropic";
-import { sendErrorToClient } from "./middleware/response/error-generator";
+import { addV1 } from "./add-v1";
+import { awsClaude } from "./aws-claude";
+import { awsMistral } from "./aws-mistral";
+import { AwsBedrockKey, keyPool } from "../shared/key-management";
 
-const LATEST_AWS_V2_MINOR_VERSION = "1";
-
-let modelsCache: any = null;
-let modelsCacheTime = 0;
-
-const getModelsResponse = () => {
-  if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
-    return modelsCache;
-  }
+const awsRouter = Router();
+awsRouter.get(["/:vendor?/v1/models", "/:vendor?/models"], handleModelsRequest);
+awsRouter.use("/claude", addV1, awsClaude);
+awsRouter.use("/mistral", addV1, awsMistral);
 
+const MODELS_CACHE_TTL = 10000;
+let modelsCache: Record<string, any> = {};
+let modelsCacheTime: Record<string, number> = {};
+function handleModelsRequest(req: Request, res: Response) {
   if (!config.awsCredentials) return { object: "list", data: [] };
 
+  const vendor = req.params.vendor?.length
+    ? req.params.vendor === "claude"
+      ? "anthropic"
+      : req.params.vendor
+    : "all";
+
+  const cacheTime = modelsCacheTime[vendor] || 0;
+  if (new Date().getTime() - cacheTime < MODELS_CACHE_TTL) {
+    return res.json(modelsCache[vendor]);
+  }
+
+  const availableModelIds = new Set<string>();
+  for (const key of keyPool.list()) {
+    if (key.isDisabled || key.service !== "aws") continue;
+    (key as AwsBedrockKey).modelIds.forEach((id) => availableModelIds.add(id));
+  }
+
   // https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids.html
-  const variants = [
+  const models = [
     "anthropic.claude-v2",
     "anthropic.claude-v2:1",
     "anthropic.claude-3-haiku-20240307-v1:0",
+    "anthropic.claude-3-5-haiku-20241022-v1:0",
     "anthropic.claude-3-sonnet-20240229-v1:0",
-  ];
-
-  const models = variants.map((id) => ({
-    id,
-    object: "model",
-    created: new Date().getTime(),
-    owned_by: "anthropic",
-    permission: [],
-    root: "claude",
-    parent: null,
-  }));
-
-  modelsCache = { object: "list", data: models };
-  modelsCacheTime = new Date().getTime();
-
-  return modelsCache;
-};
-
-const handleModelRequest: RequestHandler = (_req, res) => {
-  res.status(200).json(getModelsResponse());
-};
-
-/** Only used for non-streaming requests. */
-const awsResponseHandler: ProxyResHandlerWithBody = async (
-  _proxyRes,
-  req,
-  res,
-  body
-) => {
-  if (typeof body !== "object") {
-    throw new Error("Expected body to be an object");
-  }
-
-  let newBody = body;
-  switch (`${req.inboundApi}<-${req.outboundApi}`) {
-    case "openai<-anthropic-text":
-      req.log.info("Transforming Anthropic Text back to OpenAI format");
-      newBody = transformAwsTextResponseToOpenAI(body, req);
-      break;
-    // case "openai<-anthropic-chat":
-    // todo: implement this
-    case "anthropic-text<-anthropic-chat":
-      req.log.info("Transforming AWS Anthropic Chat back to Text format");
-      newBody = transformAnthropicChatResponseToAnthropicText(body);
-      break;
-  }
-
-  // AWS does not always confirm the model in the response, so we have to add it
-  if (!newBody.model && req.body.model) {
-    newBody.model = req.body.model;
-  }
-
-  res.status(200).json({ ...newBody, proxy: body.proxy });
-};
-
-/**
- * Transforms a model response from the Anthropic API to match those from the
- * OpenAI API, for users using Claude via the OpenAI-compatible endpoint. This
- * is only used for non-streaming requests as streaming requests are handled
- * on-the-fly.
- */
-function transformAwsTextResponseToOpenAI(
-  awsBody: Record<string, any>,
-  req: Request
-): Record<string, any> {
-  const totalTokens = (req.promptTokens ?? 0) + (req.outputTokens ?? 0);
-  return {
-    id: "aws-" + v4(),
-    object: "chat.completion",
-    created: Date.now(),
-    model: req.body.model,
-    usage: {
-      prompt_tokens: req.promptTokens,
-      completion_tokens: req.outputTokens,
-      total_tokens: totalTokens,
-    },
-    choices: [
-      {
-        message: {
-          role: "assistant",
-          content: awsBody.completion?.trim(),
-        },
-        finish_reason: awsBody.stop_reason,
-        index: 0,
-      },
-    ],
-  };
-}
-
-const awsProxy = createQueueMiddleware({
-  beforeProxy: signAwsRequest,
-  proxyMiddleware: createProxyMiddleware({
-    target: "bad-target-will-be-rewritten",
-    router: ({ signedRequest }) => {
-      if (!signedRequest) throw new Error("Must sign request before proxying");
-      return `${signedRequest.protocol}//${signedRequest.hostname}`;
-    },
-    changeOrigin: true,
-    selfHandleResponse: true,
-    logger,
-    on: {
-      proxyReq: createOnProxyReqHandler({ pipeline: [finalizeSignedRequest] }),
-      proxyRes: createOnProxyResHandler([awsResponseHandler]),
-      error: handleProxyError,
-    },
-  }),
-});
-
-const nativeTextPreprocessor = createPreprocessorMiddleware(
-  { inApi: "anthropic-text", outApi: "anthropic-text", service: "aws" },
-  { afterTransform: [maybeReassignModel] }
-);
-
-const textToChatPreprocessor = createPreprocessorMiddleware(
-  { inApi: "anthropic-text", outApi: "anthropic-chat", service: "aws" },
-  { afterTransform: [maybeReassignModel] }
-);
-
-/**
- * Routes text completion prompts to aws anthropic-chat if they need translation
- * (claude-3 based models do not support the old text completion endpoint).
- */
-const awsTextCompletionRouter: RequestHandler = (req, res, next) => {
-  if (req.body.model?.includes("claude-3")) {
-    textToChatPreprocessor(req, res, next);
-  } else {
-    nativeTextPreprocessor(req, res, next);
-  }
-};
-
-const awsRouter = Router();
-awsRouter.get("/v1/models", handleModelRequest);
-// Native(ish) Anthropic text completion endpoint.
-awsRouter.post("/v1/complete", ipLimiter, awsTextCompletionRouter, awsProxy);
-// Native Anthropic chat completion endpoint.
-awsRouter.post(
-  "/v1/messages",
-  ipLimiter,
-  createPreprocessorMiddleware(
-    { inApi: "anthropic-chat", outApi: "anthropic-chat", service: "aws" },
-    { afterTransform: [maybeReassignModel] }
-  ),
-  awsProxy
-);
-// Temporary force-Claude3 endpoint
-awsRouter.post(
-  "/v1/sonnet/:action(complete|messages)",
-  ipLimiter,
-  handleCompatibilityRequest,
-  createPreprocessorMiddleware({
-    inApi: "anthropic-text",
-    outApi: "anthropic-chat",
-    service: "aws",
-  }),
-  awsProxy
-);
-
-// OpenAI-to-AWS Anthropic compatibility endpoint.
-awsRouter.post(
-  "/v1/chat/completions",
-  ipLimiter,
-  createPreprocessorMiddleware(
-    { inApi: "openai", outApi: "anthropic-text", service: "aws" },
-    { afterTransform: [maybeReassignModel] }
-  ),
-  awsProxy
-);
-
-/**
- * Tries to deal with:
- * - frontends sending AWS model names even when they want to use the OpenAI-
- *   compatible endpoint
- * - frontends sending Anthropic model names that AWS doesn't recognize
- * - frontends sending OpenAI model names because they expect the proxy to
- *   translate them
- */
-function maybeReassignModel(req: Request) {
-  const model = req.body.model;
-
-  // If client already specified an AWS Claude model ID, use it
-  if (model.includes("anthropic.claude")) {
-    return;
-  }
-
-  const pattern =
-    /^(claude-)?(instant-)?(v)?(\d+)(\.(\d+))?(-\d+k)?(-sonnet-?|-opus-?)(\d*)/i;
-  const match = model.match(pattern);
-
-  // If there's no match, return the latest v2 model
-  if (!match) {
-    req.body.model = `anthropic.claude-v2:${LATEST_AWS_V2_MINOR_VERSION}`;
-    return;
-  }
-
-  const instant = match[2];
-  const major = match[4];
-  const minor = match[6];
-
-  if (instant) {
-    req.body.model = "anthropic.claude-instant-v1";
-    return;
-  }
-
-  // There's only one v1 model
-  if (major === "1") {
-    req.body.model = "anthropic.claude-v1";
-    return;
-  }
-
-  // Try to map Anthropic API v2 models to AWS v2 models
-  if (major === "2") {
-    if (minor === "0") {
-      req.body.model = "anthropic.claude-v2";
-      return;
-    }
-    req.body.model = `anthropic.claude-v2:${LATEST_AWS_V2_MINOR_VERSION}`;
-    return;
-  }
-
-  // AWS currently only supports one v3 model.
-  const variant = match[8]; // sonnet or opus
-  const variantVersion = match[9];
-  if (major === "3") {
-    req.body.model = "anthropic.claude-3-sonnet-20240229-v1:0";
-    return;
-  }
-
-  // Fallback to latest v2 model
-  req.body.model = `anthropic.claude-v2:${LATEST_AWS_V2_MINOR_VERSION}`;
-  return;
-}
-
-export function handleCompatibilityRequest(
-  req: Request,
-  res: Response,
-  next: any
-) {
-  const action = req.params.action;
-  const alreadyInChatFormat = Boolean(req.body.messages);
-  const compatModel = "anthropic.claude-3-sonnet-20240229-v1:0";
-  req.log.info(
-    { inputModel: req.body.model, compatModel, alreadyInChatFormat },
-    "Handling AWS compatibility request"
-  );
-
-  if (action === "messages" || alreadyInChatFormat) {
-    return sendErrorToClient({
-      req,
-      res,
-      options: {
-        title: "Unnecessary usage of compatibility endpoint",
-        message: `Your client seems to already support the new Claude API format. This endpoint is intended for clients that do not yet support the new format.\nUse the normal \`/aws/claude\` proxy endpoint instead.`,
-        format: "unknown",
-        statusCode: 400,
-        reqId: req.id,
-        obj: {
-          requested_endpoint: "/aws/claude/sonnet",
-          correct_endpoint: "/aws/claude",
-        },
-      },
+    "anthropic.claude-3-5-sonnet-20240620-v1:0",
+    "anthropic.claude-3-5-sonnet-20241022-v2:0",
+    "anthropic.claude-3-opus-20240229-v1:0",
+    "mistral.mistral-7b-instruct-v0:2",
+    "mistral.mixtral-8x7b-instruct-v0:1",
+    "mistral.mistral-large-2402-v1:0",
+    "mistral.mistral-large-2407-v1:0",
+    "mistral.mistral-small-2402-v1:0",
+  ]
+    .filter((id) => availableModelIds.has(id))
+    .map((id) => {
+      const vendor = id.match(/^(.*)\./)?.[1];
+      return {
+        id,
+        object: "model",
+        created: new Date().getTime(),
+        owned_by: vendor,
+        permission: [],
+        root: vendor,
+        parent: null,
+      };
     });
-  }
 
-  req.body.model = compatModel;
-  next();
+  modelsCache[vendor] = {
+    object: "list",
+    data: models.filter((m) => vendor === "all" || m.root === vendor),
+  };
+  modelsCacheTime[vendor] = new Date().getTime();
+
+  return res.json(modelsCache[vendor]);
 }
 
 export const aws = awsRouter;

src/proxy/azure.ts

@@ -1,73 +1,30 @@
 import { RequestHandler, Router } from "express";
-import { createProxyMiddleware } from "http-proxy-middleware";
 import { config } from "../config";
-import { keyPool } from "../shared/key-management";
-import {
-  AzureOpenAIModelFamily,
-  getAzureOpenAIModelFamily,
-  ModelFamily,
-} from "../shared/models";
-import { logger } from "../logger";
-import { KNOWN_OPENAI_MODELS } from "./openai";
-import { createQueueMiddleware } from "./queue";
+import { generateModelList } from "./openai";
 import { ipLimiter } from "./rate-limit";
-import { handleProxyError } from "./middleware/common";
 import {
   addAzureKey,
-  createOnProxyReqHandler,
   createPreprocessorMiddleware,
   finalizeSignedRequest,
 } from "./middleware/request";
-import {
-  createOnProxyResHandler,
-  ProxyResHandlerWithBody,
-} from "./middleware/response";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
 
 let modelsCache: any = null;
 let modelsCacheTime = 0;
 
-function getModelsResponse() {
-  if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
-    return modelsCache;
-  }
-
-  let available = new Set<AzureOpenAIModelFamily>();
-  for (const key of keyPool.list()) {
-    if (key.isDisabled || key.service !== "azure") continue;
-    key.modelFamilies.forEach((family) =>
-      available.add(family as AzureOpenAIModelFamily)
-    );
-  }
-  const allowed = new Set<ModelFamily>(config.allowedModelFamilies);
-  available = new Set([...available].filter((x) => allowed.has(x)));
-
-  const models = KNOWN_OPENAI_MODELS.map((id) => ({
-    id,
-    object: "model",
-    created: new Date().getTime(),
-    owned_by: "azure",
-    permission: [
-      {
-        id: "modelperm-" + id,
-        object: "model_permission",
-        created: new Date().getTime(),
-        organization: "*",
-        group: null,
-        is_blocking: false,
-      },
-    ],
-    root: id,
-    parent: null,
-  })).filter((model) => available.has(getAzureOpenAIModelFamily(model.id)));
-
-  modelsCache = { object: "list", data: models };
-  modelsCacheTime = new Date().getTime();
-
-  return modelsCache;
-}
-
 const handleModelRequest: RequestHandler = (_req, res) => {
-  res.status(200).json(getModelsResponse());
+  if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
+    return res.status(200).json(modelsCache);
+  }
+
+  if (!config.azureCredentials) return { object: "list", data: [] };
+
+  const result = generateModelList("azure");
+
+  modelsCache = { object: "list", data: result };
+  modelsCacheTime = new Date().getTime();
+  res.status(200).json(modelsCache);
 };
 
 const azureOpenaiResponseHandler: ProxyResHandlerWithBody = async (
@@ -83,26 +40,17 @@ const azureOpenaiResponseHandler: ProxyResHandlerWithBody = async (
   res.status(200).json({ ...body, proxy: body.proxy });
 };
 
-const azureOpenAIProxy = createQueueMiddleware({
-  beforeProxy: addAzureKey,
-  proxyMiddleware: createProxyMiddleware({
-    target: "will be set by router",
-    router: (req) => {
-      if (!req.signedRequest) throw new Error("signedRequest not set");
-      const { hostname, path } = req.signedRequest;
-      return `https://${hostname}${path}`;
-    },
-    changeOrigin: true,
-    selfHandleResponse: true,
-    logger,
-    on: {
-      proxyReq: createOnProxyReqHandler({ pipeline: [finalizeSignedRequest] }),
-      proxyRes: createOnProxyResHandler([azureOpenaiResponseHandler]),
-      error: handleProxyError,
-    },
-  }),
+const azureOpenAIProxy = createQueuedProxyMiddleware({
+  target: ({ signedRequest }) => {
+    if (!signedRequest) throw new Error("Must sign request before proxying");
+    const { hostname, protocol } = signedRequest;
+    return `${protocol}//${hostname}`;
+  },
+  mutations: [addAzureKey, finalizeSignedRequest],
+  blockingResponseHandler: azureOpenaiResponseHandler,
 });
 
+
 const azureOpenAIRouter = Router();
 azureOpenAIRouter.get("/v1/models", handleModelRequest);
 azureOpenAIRouter.post(

src/proxy/gatekeeper.ts

@@ -1,6 +1,7 @@
-import type { Request, RequestHandler } from "express";
+import type { Request, Response, RequestHandler } from "express";
 import { config } from "../config";
 import { authenticate, getUser } from "../shared/users/user-store";
+import { sendErrorToClient } from "./middleware/response/error-generator";
 
 const GATEKEEPER = config.gatekeeper;
 const PROXY_KEY = config.proxyKey;
@@ -11,6 +12,7 @@ function getProxyAuthorizationFromRequest(req: Request): string | undefined {
   // pass the _proxy_ key in this header too, instead of providing it as a
   // Bearer token in the Authorization header.  So we need to check both.
   // Prefer the Authorization header if both are present.
+  // Google AI uses a key querystring parameter.
 
   if (req.headers.authorization) {
     const token = req.headers.authorization?.slice("Bearer ".length);
@@ -23,6 +25,12 @@ function getProxyAuthorizationFromRequest(req: Request): string | undefined {
     delete req.headers["x-api-key"];
     return token;
   }
+  
+  if (req.query.key) {
+    const token = req.query.key?.toString();
+    delete req.query.key;
+    return token;
+  }
 
   return undefined;
 }
@@ -50,9 +58,9 @@ export const gatekeeper: RequestHandler = (req, res, next) => {
     // IP alone to distinguish between them and prevent usertoken sharing.
     // Risu sends a signed token in the request headers with an anonymous user
     // ID that we can instead use to associate requests with an individual.
-    const ip = req.risuToken?.length ?
-      `risu${req.risuToken}-${req.ip}` :
-      req.ip;
+    const ip = req.risuToken?.length
+      ? `risu${req.risuToken}-${req.ip}`
+      : req.ip;
 
     const { user, result } = authenticate(token, ip);
 
@@ -61,17 +69,50 @@ export const gatekeeper: RequestHandler = (req, res, next) => {
         req.user = user;
         return next();
       case "limited":
-        return res.status(403).json({
-          error: `Forbidden: no more IPs can authenticate with this token`,
-        });
+        return sendError(
+          req,
+          res,
+          403,
+          `Forbidden: no more IP addresses allowed for this user token`,
+          { currentIp: ip, maxIps: user?.maxIps }
+        );
       case "disabled":
         const bannedUser = getUser(token);
         if (bannedUser?.disabledAt) {
-          const reason = bannedUser.disabledReason || "Token disabled";
-          return res.status(403).json({ error: `Forbidden: ${reason}` });
+          const reason = bannedUser.disabledReason || "User token disabled";
+          return sendError(req, res, 403, `Forbidden: ${reason}`);
         }
     }
   }
 
-  res.status(401).json({ error: "Unauthorized" });
+  sendError(req, res, 401, "Unauthorized");
 };
+
+function sendError(
+  req: Request,
+  res: Response,
+  status: number,
+  message: string,
+  data: any = {}
+) {
+  const isPost = req.method === "POST";
+  const hasBody = isPost && req.body;
+  const hasModel = hasBody && req.body.model;
+
+  if (!hasModel) {
+    return res.status(status).json({ error: message });
+  }
+
+  sendErrorToClient({
+    req,
+    res,
+    options: {
+      title: `Proxy gatekeeper error (HTTP ${status})`,
+      message,
+      format: "unknown",
+      statusCode: status,
+      reqId: req.id,
+      obj: data,
+    },
+  });
+}

src/proxy/gcp.ts

@@ -0,0 +1,196 @@
+import { Request, RequestHandler, Router } from "express";
+import { config } from "../config";
+import { transformAnthropicChatResponseToOpenAI } from "./anthropic";
+import { ipLimiter } from "./rate-limit";
+import {
+  createPreprocessorMiddleware,
+  finalizeSignedRequest,
+  signGcpRequest,
+} from "./middleware/request";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
+
+const LATEST_GCP_SONNET_MINOR_VERSION = "20240229";
+
+let modelsCache: any = null;
+let modelsCacheTime = 0;
+
+const getModelsResponse = () => {
+  if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
+    return modelsCache;
+  }
+
+  if (!config.gcpCredentials) return { object: "list", data: [] };
+
+  // https://docs.anthropic.com/en/docs/about-claude/models
+  const variants = [
+    "claude-3-haiku@20240307",
+    "claude-3-5-haiku@20241022",
+    "claude-3-sonnet@20240229",
+    "claude-3-5-sonnet@20240620",
+    "claude-3-5-sonnet-v2@20241022",
+    "claude-3-opus@20240229",
+  ];
+
+  const models = variants.map((id) => ({
+    id,
+    object: "model",
+    created: new Date().getTime(),
+    owned_by: "anthropic",
+    permission: [],
+    root: "claude",
+    parent: null,
+  }));
+
+  modelsCache = { object: "list", data: models };
+  modelsCacheTime = new Date().getTime();
+
+  return modelsCache;
+};
+
+const handleModelRequest: RequestHandler = (_req, res) => {
+  res.status(200).json(getModelsResponse());
+};
+
+const gcpBlockingResponseHandler: ProxyResHandlerWithBody = async (
+  _proxyRes,
+  req,
+  res,
+  body
+) => {
+  if (typeof body !== "object") {
+    throw new Error("Expected body to be an object");
+  }
+
+  let newBody = body;
+  switch (`${req.inboundApi}<-${req.outboundApi}`) {
+    case "openai<-anthropic-chat":
+      req.log.info("Transforming Anthropic Chat back to OpenAI format");
+      newBody = transformAnthropicChatResponseToOpenAI(body);
+      break;
+  }
+
+  res.status(200).json({ ...newBody, proxy: body.proxy });
+};
+
+const gcpProxy = createQueuedProxyMiddleware({
+  target: ({ signedRequest }) => {
+    if (!signedRequest) throw new Error("Must sign request before proxying");
+    return `${signedRequest.protocol}//${signedRequest.hostname}`;
+  },
+  mutations: [signGcpRequest, finalizeSignedRequest],
+  blockingResponseHandler: gcpBlockingResponseHandler,
+});
+
+const oaiToChatPreprocessor = createPreprocessorMiddleware(
+  { inApi: "openai", outApi: "anthropic-chat", service: "gcp" },
+  { afterTransform: [maybeReassignModel] }
+);
+
+/**
+ * Routes an OpenAI prompt to either the legacy Claude text completion endpoint
+ * or the new Claude chat completion endpoint, based on the requested model.
+ */
+const preprocessOpenAICompatRequest: RequestHandler = (req, res, next) => {
+  oaiToChatPreprocessor(req, res, next);
+};
+
+const gcpRouter = Router();
+gcpRouter.get("/v1/models", handleModelRequest);
+// Native Anthropic chat completion endpoint.
+gcpRouter.post(
+  "/v1/messages",
+  ipLimiter,
+  createPreprocessorMiddleware(
+    { inApi: "anthropic-chat", outApi: "anthropic-chat", service: "gcp" },
+    { afterTransform: [maybeReassignModel] }
+  ),
+  gcpProxy
+);
+
+// OpenAI-to-GCP Anthropic compatibility endpoint.
+gcpRouter.post(
+  "/v1/chat/completions",
+  ipLimiter,
+  preprocessOpenAICompatRequest,
+  gcpProxy
+);
+
+/**
+ * Tries to deal with:
+ * - frontends sending GCP model names even when they want to use the OpenAI-
+ *   compatible endpoint
+ * - frontends sending Anthropic model names that GCP doesn't recognize
+ * - frontends sending OpenAI model names because they expect the proxy to
+ *   translate them
+ *
+ * If client sends GCP model ID it will be used verbatim. Otherwise, various
+ * strategies are used to try to map a non-GCP model name to GCP model ID.
+ */
+function maybeReassignModel(req: Request) {
+  const model = req.body.model;
+
+  // If it looks like an GCP model, use it as-is
+  // if (model.includes("anthropic.claude")) {
+  if (model.startsWith("claude-") && model.includes("@")) {
+    return;
+  }
+
+  // Anthropic model names can look like:
+  // - claude-v1
+  // - claude-2.1
+  // - claude-3-5-sonnet-20240620-v1:0
+  const pattern =
+    /^(claude-)?(instant-)?(v)?(\d+)([.-](\d{1}))?(-\d+k)?(-sonnet-|-opus-|-haiku-)?(\d*)/i;
+  const match = model.match(pattern);
+
+  // If there's no match, fallback to Claude3 Sonnet as it is most likely to be
+  // available on GCP.
+  if (!match) {
+    req.body.model = `claude-3-sonnet@${LATEST_GCP_SONNET_MINOR_VERSION}`;
+    return;
+  }
+
+  const [_, _cl, instant, _v, major, _sep, minor, _ctx, name, rev] = match;
+
+  // TODO: rework this to function similarly to aws-claude.ts maybeReassignModel
+  const ver = minor ? `${major}.${minor}` : major;
+  switch (ver) {
+    case "3":
+    case "3.0":
+      if (name.includes("opus")) {
+        req.body.model = "claude-3-opus@20240229";
+      } else if (name.includes("haiku")) {
+        req.body.model = "claude-3-haiku@20240307";
+      } else {
+        req.body.model = "claude-3-sonnet@20240229";
+      }
+      return;
+    case "3.5":
+      switch (name) {
+        case "sonnet":
+          switch (rev) {
+            case "20241022":
+            case "latest":
+              req.body.model = "claude-3-5-sonnet-v2@20241022";
+              return;
+            case "20240620":
+              req.body.model = "claude-3-5-sonnet@20240620";
+              return;
+          }
+          break;
+        case "haiku":
+          req.body.model = "claude-3-5-haiku@20241022";
+          return;
+        case "opus":
+          // Add after model ids are announced late 2024
+          break;
+      }
+  }
+
+  // Fallback to Claude3 Sonnet
+  req.body.model = `claude-3-sonnet@${LATEST_GCP_SONNET_MINOR_VERSION}`;
+  return;
+}
+
+export const gcp = gcpRouter;

src/proxy/google-ai.ts

@@ -1,21 +1,15 @@
 import { Request, RequestHandler, Router } from "express";
-import { createProxyMiddleware } from "http-proxy-middleware";
 import { v4 } from "uuid";
+import { GoogleAIKey, keyPool } from "../shared/key-management";
 import { config } from "../config";
-import { logger } from "../logger";
-import { createQueueMiddleware } from "./queue";
 import { ipLimiter } from "./rate-limit";
-import { handleProxyError } from "./middleware/common";
 import {
-  createOnProxyReqHandler,
   createPreprocessorMiddleware,
   finalizeSignedRequest,
 } from "./middleware/request";
-import {
-  createOnProxyResHandler,
-  ProxyResHandlerWithBody,
-} from "./middleware/response";
-import { addGoogleAIKey } from "./middleware/request/preprocessors/add-google-ai-key";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import { addGoogleAIKey } from "./middleware/request/mutators/add-google-ai-key";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
 
 let modelsCache: any = null;
 let modelsCacheTime = 0;
@@ -30,9 +24,19 @@ const getModelsResponse = () => {
 
   if (!config.googleAIKey) return { object: "list", data: [] };
 
-  const googleAIVariants = ["gemini-pro", "gemini-1.0-pro", "gemini-1.5-pro"];
+  const keys = keyPool
+    .list()
+    .filter((k) => k.service === "google-ai") as GoogleAIKey[];
+  if (keys.length === 0) {
+    modelsCache = { object: "list", data: [] };
+    modelsCacheTime = new Date().getTime();
+    return modelsCache;
+  }
 
-  const models = googleAIVariants.map((id) => ({
+  const modelIds = Array.from(
+    new Set(keys.map((k) => k.modelIds).flat())
+  ).filter((id) => id.startsWith("models/gemini"));
+  const models = modelIds.map((id) => ({
     id,
     object: "model",
     created: new Date().getTime(),
@@ -52,8 +56,7 @@ const handleModelRequest: RequestHandler = (_req, res) => {
   res.status(200).json(getModelsResponse());
 };
 
-/** Only used for non-streaming requests. */
-const googleAIResponseHandler: ProxyResHandlerWithBody = async (
+const googleAIBlockingResponseHandler: ProxyResHandlerWithBody = async (
   _proxyRes,
   req,
   res,
@@ -99,37 +102,75 @@ function transformGoogleAIResponse(
   };
 }
 
-const googleAIProxy = createQueueMiddleware({
-  beforeProxy: addGoogleAIKey,
-  proxyMiddleware: createProxyMiddleware({
-    target: "bad-target-will-be-rewritten",
-    router: ({ signedRequest }) => {
-      const { protocol, hostname, path } = signedRequest;
-      return `${protocol}//${hostname}${path}`;
-    },
-    changeOrigin: true,
-    selfHandleResponse: true,
-    logger,
-    on: {
-      proxyReq: createOnProxyReqHandler({ pipeline: [finalizeSignedRequest] }),
-      proxyRes: createOnProxyResHandler([googleAIResponseHandler]),
-      error: handleProxyError,
-    },
-  }),
+const googleAIProxy = createQueuedProxyMiddleware({
+  target: ({ signedRequest }) => {
+    if (!signedRequest) throw new Error("Must sign request before proxying");
+    const { protocol, hostname} = signedRequest;
+    return `${protocol}//${hostname}`;
+  },
+  mutations: [addGoogleAIKey, finalizeSignedRequest],
+  blockingResponseHandler: googleAIBlockingResponseHandler,
 });
 
 const googleAIRouter = Router();
 googleAIRouter.get("/v1/models", handleModelRequest);
+
+// Native Google AI chat completion endpoint
+googleAIRouter.post(
+  "/v1beta/models/:modelId:(generateContent|streamGenerateContent)",
+  ipLimiter,
+  createPreprocessorMiddleware(
+    { inApi: "google-ai", outApi: "google-ai", service: "google-ai" },
+    { beforeTransform: [maybeReassignModel], afterTransform: [setStreamFlag] }
+  ),
+  googleAIProxy
+);
+
 // OpenAI-to-Google AI compatibility endpoint.
 googleAIRouter.post(
   "/v1/chat/completions",
   ipLimiter,
-  createPreprocessorMiddleware({
-    inApi: "openai",
-    outApi: "google-ai",
-    service: "google-ai",
-  }),
+  createPreprocessorMiddleware(
+    { inApi: "openai", outApi: "google-ai", service: "google-ai" },
+    { afterTransform: [maybeReassignModel] }
+  ),
   googleAIProxy
 );
 
+function setStreamFlag(req: Request) {
+  const isStreaming = req.url.includes("streamGenerateContent");
+  if (isStreaming) {
+    req.body.stream = true;
+    req.isStreaming = true;
+  } else {
+    req.body.stream = false;
+    req.isStreaming = false;
+  }
+}
+
+/**
+ * Replaces requests for non-Google AI models with gemini-1.5-pro-latest.
+ * Also strips models/ from the beginning of the model IDs.
+ **/
+function maybeReassignModel(req: Request) {
+  // Ensure model is on body as a lot of middleware will expect it.
+  const model = req.body.model || req.url.split("/").pop()?.split(":").shift();
+  if (!model) {
+    throw new Error("You must specify a model with your request.");
+  }
+  req.body.model = model;
+
+  const requested = model;
+  if (requested.startsWith("models/")) {
+    req.body.model = requested.slice("models/".length);
+  }
+
+  if (requested.includes("gemini")) {
+    return;
+  }
+
+  req.log.info({ requested }, "Reassigning model to gemini-1.5-pro-latest");
+  req.body.model = "gemini-1.5-pro-latest";
+}
+
 export const googleAI = googleAIRouter;

src/proxy/middleware/common.ts

@@ -1,12 +1,12 @@
 import { Request, Response } from "express";
 import http from "http";
-import httpProxy from "http-proxy";
+import { Socket } from "net";
 import { ZodError } from "zod";
 import { generateErrorMessage } from "zod-error";
+import { HttpError } from "../../shared/errors";
 import { assertNever } from "../../shared/utils";
 import { QuotaExceededError } from "./request/preprocessors/apply-quota-limits";
 import { sendErrorToClient } from "./response/error-generator";
-import { HttpError } from "../../shared/errors";
 
 const OPENAI_CHAT_COMPLETION_ENDPOINT = "/v1/chat/completions";
 const OPENAI_TEXT_COMPLETION_ENDPOINT = "/v1/completions";
@@ -16,6 +16,7 @@ const ANTHROPIC_COMPLETION_ENDPOINT = "/v1/complete";
 const ANTHROPIC_MESSAGES_ENDPOINT = "/v1/messages";
 const ANTHROPIC_SONNET_COMPAT_ENDPOINT = "/v1/sonnet";
 const ANTHROPIC_OPUS_COMPAT_ENDPOINT = "/v1/opus";
+const GOOGLE_AI_COMPLETION_ENDPOINT = "/v1beta/models";
 
 export function isTextGenerationRequest(req: Request) {
   return (
@@ -27,6 +28,7 @@ export function isTextGenerationRequest(req: Request) {
       ANTHROPIC_MESSAGES_ENDPOINT,
       ANTHROPIC_SONNET_COMPAT_ENDPOINT,
       ANTHROPIC_OPUS_COMPAT_ENDPOINT,
+      GOOGLE_AI_COMPLETION_ENDPOINT,
     ].some((endpoint) => req.path.startsWith(endpoint))
   );
 }
@@ -54,13 +56,13 @@ export function sendProxyError(
   const msg =
     statusCode === 500
       ? `The proxy encountered an error while trying to process your prompt.`
-      : `The proxy encountered an error while trying to send your prompt to the upstream service.`;
+      : `The proxy encountered an error while trying to send your prompt to the API.`;
 
   sendErrorToClient({
     options: {
       format: req.inboundApi,
       title: `Proxy error (HTTP ${statusCode} ${statusMessage})`,
-      message: `${msg} Further technical details are provided below.`,
+      message: `${msg} Further details are provided below.`,
       obj: errorPayload,
       reqId: req.id,
       model: req.body?.model,
@@ -70,16 +72,23 @@ export function sendProxyError(
   });
 }
 
-export const handleProxyError: httpProxy.ErrorCallback = (err, req, res) => {
-  req.log.error(err, `Error during http-proxy-middleware request`);
-  classifyErrorAndSend(err, req as Request, res as Response);
-};
-
+/**
+ * Handles errors thrown during preparation of a proxy request (before it is
+ * sent to the upstream API), typically due to validation, quota, or other
+ * pre-flight checks. Depending on the error class, this function will send an
+ * appropriate error response to the client, streaming it if necessary.
+ */
 export const classifyErrorAndSend = (
   err: Error,
   req: Request,
-  res: Response
+  res: Response | Socket
 ) => {
+  if (res instanceof Socket) {
+    // We should always have an Express response object here, but http-proxy's
+    // ErrorCallback type says it could be just a Socket.
+    req.log.error(err, "Caught error while proxying request to target but cannot send error response to client.");
+    return res.destroy();
+  }
   try {
     const { statusCode, statusMessage, userMessage, ...errorDetails } =
       classifyError(err);
@@ -221,9 +230,12 @@ export function getCompletionFromBody(req: Request, body: Record<string, any>) {
   switch (format) {
     case "openai":
     case "mistral-ai":
-      // Can be null if the model wants to invoke tools rather than return a
-      // completion.
-      return body.choices[0].message.content || "";
+      // Few possible values:
+      // - choices[0].message.content
+      // - choices[0].message with no content if model is invoking a tool
+      return body.choices?.[0]?.message?.content || "";
+    case "mistral-text":
+      return body.outputs?.[0]?.text || "";
     case "openai-text":
       return body.choices[0].text;
     case "anthropic-chat":
@@ -252,7 +264,15 @@ export function getCompletionFromBody(req: Request, body: Record<string, any>) {
       if ("choices" in body) {
         return body.choices[0].message.content;
       }
-      return body.candidates[0].content.parts[0].text;
+      const text = body.candidates[0].content?.parts?.[0]?.text;
+      if (!text) {
+        req.log.warn(
+          { body: JSON.stringify(body) },
+          "Received empty Google AI text completion"
+        );
+        return "";
+      }
+      return text;
     case "openai-image":
       return body.data?.map((item: any) => item.url).join("\n");
     default:
@@ -260,22 +280,22 @@ export function getCompletionFromBody(req: Request, body: Record<string, any>) {
   }
 }
 
-export function getModelFromBody(req: Request, body: Record<string, any>) {
+export function getModelFromBody(req: Request, resBody: Record<string, any>) {
   const format = req.outboundApi;
   switch (format) {
     case "openai":
     case "openai-text":
+      return resBody.model;
     case "mistral-ai":
-      return body.model;
+    case "mistral-text":
     case "openai-image":
+    case "google-ai":
+      // These formats don't have a model in the response body.
       return req.body.model;
     case "anthropic-chat":
     case "anthropic-text":
       // Anthropic confirms the model in the response, but AWS Claude doesn't.
-      return body.model || req.body.model;
-    case "google-ai":
-      // Google doesn't confirm the model in the response.
-      return req.body.model;
+      return resBody.model || req.body.model;
     default:
       assertNever(format);
   }

src/proxy/middleware/request/index.ts

@@ -1,42 +1,38 @@
 import type { Request } from "express";
-import type { ClientRequest } from "http";
-import type { ProxyReqCallback } from "http-proxy";
 
-export { createOnProxyReqHandler } from "./onproxyreq-factory";
+import { ProxyReqManager } from "./proxy-req-manager";
 export {
   createPreprocessorMiddleware,
   createEmbeddingsPreprocessorMiddleware,
 } from "./preprocessor-factory";
 
-// Express middleware (runs before http-proxy-middleware, can be async)
-export { addAzureKey } from "./preprocessors/add-azure-key";
+// Preprocessors (runs before request is queued, usually body transformation/validation)
 export { applyQuotaLimits } from "./preprocessors/apply-quota-limits";
-export { validateContextSize } from "./preprocessors/validate-context-size";
+export { blockZoomerOrigins } from "./preprocessors/block-zoomer-origins";
 export { countPromptTokens } from "./preprocessors/count-prompt-tokens";
 export { languageFilter } from "./preprocessors/language-filter";
 export { setApiFormat } from "./preprocessors/set-api-format";
-export { signAwsRequest } from "./preprocessors/sign-aws-request";
 export { transformOutboundPayload } from "./preprocessors/transform-outbound-payload";
+export { validateContextSize } from "./preprocessors/validate-context-size";
+export { validateModelFamily } from "./preprocessors/validate-model-family";
+export { validateVision } from "./preprocessors/validate-vision";
 
-// http-proxy-middleware callbacks (runs on onProxyReq, cannot be async)
-export { addKey, addKeyForEmbeddingsRequest } from "./onproxyreq/add-key";
-export { addAnthropicPreamble } from "./onproxyreq/add-anthropic-preamble";
-export { blockZoomerOrigins } from "./onproxyreq/block-zoomer-origins";
-export { checkModelFamily } from "./onproxyreq/check-model-family";
-export { finalizeBody } from "./onproxyreq/finalize-body";
-export { finalizeSignedRequest } from "./onproxyreq/finalize-signed-request";
-export { stripHeaders } from "./onproxyreq/strip-headers";
+// Proxy request mutators (runs every time request is dequeued, before proxying, usually for auth/signing)
+export { addKey, addKeyForEmbeddingsRequest } from "./mutators/add-key";
+export { addAzureKey } from "./mutators/add-azure-key";
+export { finalizeBody } from "./mutators/finalize-body";
+export { finalizeSignedRequest } from "./mutators/finalize-signed-request";
+export { signAwsRequest } from "./mutators/sign-aws-request";
+export { signGcpRequest } from "./mutators/sign-vertex-ai-request";
+export { stripHeaders } from "./mutators/strip-headers";
 
 /**
- * Middleware that runs prior to the request being handled by http-proxy-
- * middleware.
+ * Middleware that runs prior to the request being queued or handled by
+ * http-proxy-middleware. You will not have access to the proxied
+ * request/response objects since they have not yet been sent to the API.
  *
- * Async functions can be used here, but you will not have access to the proxied
- * request/response objects, nor the data set by ProxyRequestMiddleware
- * functions as they have not yet been run.
- *
- * User will have been authenticated by the time this middleware runs, but your
- * request won't have been assigned an API key yet.
+ * User will have been authenticated by the proxy's gatekeeper, but the request
+ * won't have been assigned an upstream API key yet.
  *
  * Note that these functions only run once ever per request, even if the request
  * is automatically retried by the request queue middleware.
@@ -44,17 +40,14 @@ export { stripHeaders } from "./onproxyreq/strip-headers";
 export type RequestPreprocessor = (req: Request) => void | Promise<void>;
 
 /**
- * Callbacks that run immediately before the request is sent to the API in
- * response to http-proxy-middleware's `proxyReq` event.
+ * Middleware that runs immediately before the request is proxied to the
+ * upstream API, after dequeueing the request from the request queue.
  *
- * Async functions cannot be used here as HPM's event emitter is not async and
- * will not wait for the promise to resolve before sending the request.
- *
- * Note that these functions may be run multiple times per request if the
- * first attempt is rate limited and the request is automatically retried by the
- * request queue middleware.
+ * Because these middleware may be run multiple times per request if a retryable
+ * error occurs and the request put back in the queue, they must be idempotent.
+ * A change manager is provided to allow the middleware to make changes to the
+ * request which can be automatically reverted.
  */
-export type HPMRequestCallback = ProxyReqCallback<ClientRequest, Request>;
-
-export const forceModel = (model: string) => (req: Request) =>
-  void (req.body.model = model);
+export type ProxyReqMutator = (
+  changeManager: ProxyReqManager
+) => void | Promise<void>;

src/proxy/middleware/request/mutators/add-azure-key.ts

@@ -3,14 +3,16 @@ import {
   AzureOpenAIKey,
   keyPool,
 } from "../../../../shared/key-management";
-import { RequestPreprocessor } from "../index";
+import { ProxyReqMutator } from "../index";
 
-export const addAzureKey: RequestPreprocessor = (req) => {
+export const addAzureKey: ProxyReqMutator = async (manager) => {
+  const req = manager.request;
   const validAPIs: APIFormat[] = ["openai", "openai-image"];
   const apisValid = [req.outboundApi, req.inboundApi].every((api) =>
     validAPIs.includes(api)
   );
   const serviceValid = req.service === "azure";
+
   if (!apisValid || !serviceValid) {
     throw new Error("addAzureKey called on invalid request");
   }
@@ -22,11 +24,15 @@ export const addAzureKey: RequestPreprocessor = (req) => {
   const model = req.body.model.startsWith("azure-")
     ? req.body.model
     : `azure-${req.body.model}`;
-
-  req.key = keyPool.get(model, "azure");
+  // TODO: untracked mutation to body, I think this should just be a
+  // RequestPreprocessor because we don't need to do it every dequeue.
   req.body.model = model;
 
+  const key = keyPool.get(model, "azure");
+  manager.setKey(key);
+
   // Handles the sole Azure API deviation from the OpenAI spec (that I know of)
+  // TODO: this should also probably be a RequestPreprocessor
   const notNullOrUndefined = (x: any) => x !== null && x !== undefined;
   if ([req.body.logprobs, req.body.top_logprobs].some(notNullOrUndefined)) {
     // OpenAI wants logprobs: true/false and top_logprobs: number
@@ -43,7 +49,7 @@ export const addAzureKey: RequestPreprocessor = (req) => {
   }
 
   req.log.info(
-    { key: req.key.hash, model },
+    { key: key.hash, model },
     "Assigned Azure OpenAI key to request"
   );
 
@@ -55,7 +61,7 @@ export const addAzureKey: RequestPreprocessor = (req) => {
   const apiVersion =
     req.outboundApi === "openai" ? "2023-09-01-preview" : "2024-02-15-preview";
 
-  req.signedRequest = {
+  manager.setSignedRequest({
     method: "POST",
     protocol: "https:",
     hostname: `${resourceName}.openai.azure.com`,
@@ -66,7 +72,7 @@ export const addAzureKey: RequestPreprocessor = (req) => {
       ["api-key"]: apiKey,
     },
     body: JSON.stringify(req.body),
-  };
+  });
 };
 
 function getCredentialsFromKey(key: AzureOpenAIKey) {

src/proxy/middleware/request/mutators/add-google-ai-key.ts

@@ -0,0 +1,44 @@
+import { keyPool } from "../../../../shared/key-management";
+import { ProxyReqMutator } from "../index";
+
+export const addGoogleAIKey: ProxyReqMutator = (manager) => {
+  const req = manager.request;
+  const inboundValid =
+    req.inboundApi === "openai" || req.inboundApi === "google-ai";
+  const outboundValid = req.outboundApi === "google-ai";
+
+  const serviceValid = req.service === "google-ai";
+  if (!inboundValid || !outboundValid || !serviceValid) {
+    throw new Error("addGoogleAIKey called on invalid request");
+  }
+
+  const model = req.body.model;
+  const key = keyPool.get(model, "google-ai");
+  manager.setKey(key);
+
+  req.log.info(
+    { key: key.hash, model, stream: req.isStreaming },
+    "Assigned Google AI API key to request"
+  );
+
+  // https://generativelanguage.googleapis.com/v1beta/models/$MODEL_ID:generateContent?key=$API_KEY
+  // https://generativelanguage.googleapis.com/v1beta/models/$MODEL_ID:streamGenerateContent?key=${API_KEY}
+  const payload = { ...req.body, stream: undefined, model: undefined };
+
+  // TODO: this isn't actually signed, so the manager api is a little unclear
+  // with the ProxyReqManager refactor, it's probably no longer necesasry to
+  // do this because we can modify the path using Manager.setPath.
+  manager.setSignedRequest({
+    method: "POST",
+    protocol: "https:",
+    hostname: "generativelanguage.googleapis.com",
+    path: `/v1beta/models/${model}:${
+      req.isStreaming ? "streamGenerateContent?alt=sse&" : "generateContent?"
+    }key=${key.key}`,
+    headers: {
+      ["host"]: `generativelanguage.googleapis.com`,
+      ["content-type"]: "application/json",
+    },
+    body: JSON.stringify(payload),
+  });
+};

src/proxy/middleware/request/mutators/add-key.ts

@@ -1,9 +1,13 @@
+import { AnthropicChatMessage } from "../../../../shared/api-schemas";
+import { containsImageContent } from "../../../../shared/api-schemas/anthropic";
 import { Key, OpenAIKey, keyPool } from "../../../../shared/key-management";
 import { isEmbeddingsRequest } from "../../common";
-import { HPMRequestCallback } from "../index";
 import { assertNever } from "../../../../shared/utils";
+import { ProxyReqMutator } from "../index";
+
+export const addKey: ProxyReqMutator = (manager) => {
+  const req = manager.request;
 
-export const addKey: HPMRequestCallback = (proxyReq, req) => {
   let assignedKey: Key;
   const { service, inboundApi, outboundApi, body } = req;
 
@@ -19,17 +23,27 @@ export const addKey: HPMRequestCallback = (proxyReq, req) => {
     throw new Error("You must specify a model with your request.");
   }
 
+  let needsMultimodal = false;
+  if (outboundApi === "anthropic-chat") {
+    needsMultimodal = containsImageContent(
+      body.messages as AnthropicChatMessage[]
+    );
+  }
+
   if (inboundApi === outboundApi) {
-    assignedKey = keyPool.get(body.model, service);
+    assignedKey = keyPool.get(body.model, service, needsMultimodal);
   } else {
     switch (outboundApi) {
       // If we are translating between API formats we may need to select a model
       // for the user, because the provided model is for the inbound API.
       // TODO: This whole else condition is probably no longer needed since API
       // translation now reassigns the model earlier in the request pipeline.
-      case "anthropic-chat":
       case "anthropic-text":
-        assignedKey = keyPool.get("claude-v1", service);
+      case "anthropic-chat":
+      case "mistral-ai":
+      case "mistral-text":
+      case "google-ai":
+        assignedKey = keyPool.get(body.model, service);
         break;
       case "openai-text":
         assignedKey = keyPool.get("gpt-3.5-turbo-instruct", service);
@@ -38,17 +52,15 @@ export const addKey: HPMRequestCallback = (proxyReq, req) => {
         assignedKey = keyPool.get("dall-e-3", service);
         break;
       case "openai":
-      case "google-ai":
-      case "mistral-ai":
         throw new Error(
-          `add-key should not be called for outbound API ${outboundApi}`
+          `Outbound API ${outboundApi} is not supported for ${inboundApi}`
         );
       default:
         assertNever(outboundApi);
     }
   }
 
-  req.key = assignedKey;
+  manager.setKey(assignedKey);
   req.log.info(
     { key: assignedKey.hash, model: body.model, inboundApi, outboundApi },
     "Assigned key to request"
@@ -57,23 +69,27 @@ export const addKey: HPMRequestCallback = (proxyReq, req) => {
   // TODO: KeyProvider should assemble all necessary headers
   switch (assignedKey.service) {
     case "anthropic":
-      proxyReq.setHeader("X-API-Key", assignedKey.key);
+      manager.setHeader("X-API-Key", assignedKey.key);
+      if (!manager.request.headers["anthropic-version"]) {
+        manager.setHeader("anthropic-version", "2023-06-01");
+      }
       break;
     case "openai":
       const key: OpenAIKey = assignedKey as OpenAIKey;
-      if (key.organizationId) {
-        proxyReq.setHeader("OpenAI-Organization", key.organizationId);
+      if (key.organizationId && !key.key.includes("svcacct")) {
+        manager.setHeader("OpenAI-Organization", key.organizationId);
       }
-      proxyReq.setHeader("Authorization", `Bearer ${assignedKey.key}`);
+      manager.setHeader("Authorization", `Bearer ${assignedKey.key}`);
       break;
     case "mistral-ai":
-      proxyReq.setHeader("Authorization", `Bearer ${assignedKey.key}`);
+      manager.setHeader("Authorization", `Bearer ${assignedKey.key}`);
       break;
     case "azure":
       const azureKey = assignedKey.key;
-      proxyReq.setHeader("api-key", azureKey);
+      manager.setHeader("api-key", azureKey);
       break;
     case "aws":
+    case "gcp":
     case "google-ai":
       throw new Error("add-key should not be used for this service.");
     default:
@@ -85,10 +101,8 @@ export const addKey: HPMRequestCallback = (proxyReq, req) => {
  * Special case for embeddings requests which don't go through the normal
  * request pipeline.
  */
-export const addKeyForEmbeddingsRequest: HPMRequestCallback = (
-  proxyReq,
-  req
-) => {
+export const addKeyForEmbeddingsRequest: ProxyReqMutator = (manager) => {
+  const req = manager.request;
   if (!isEmbeddingsRequest(req)) {
     throw new Error(
       "addKeyForEmbeddingsRequest called on non-embeddings request"
@@ -99,18 +113,18 @@ export const addKeyForEmbeddingsRequest: HPMRequestCallback = (
     throw new Error("Embeddings requests must be from OpenAI");
   }
 
-  req.body = { input: req.body.input, model: "text-embedding-ada-002" };
+  manager.setBody({ input: req.body.input, model: "text-embedding-ada-002" });
 
   const key = keyPool.get("text-embedding-ada-002", "openai") as OpenAIKey;
 
-  req.key = key;
+  manager.setKey(key);
   req.log.info(
     { key: key.hash, toApi: req.outboundApi },
     "Assigned Turbo key to embeddings request"
   );
 
-  proxyReq.setHeader("Authorization", `Bearer ${key.key}`);
+  manager.setHeader("Authorization", `Bearer ${key.key}`);
   if (key.organizationId) {
-    proxyReq.setHeader("OpenAI-Organization", key.organizationId);
+    manager.setHeader("OpenAI-Organization", key.organizationId);
   }
 };

src/proxy/middleware/request/mutators/finalize-body.ts

@@ -0,0 +1,22 @@
+import type { ProxyReqMutator } from "../index";
+
+/** Finalize the rewritten request body. Must be the last mutator. */
+export const finalizeBody: ProxyReqMutator = (manager) => {
+  const req = manager.request;
+
+  if (["POST", "PUT", "PATCH"].includes(req.method ?? "") && req.body) {
+    // For image generation requests, remove stream flag.
+    if (req.outboundApi === "openai-image") {
+      delete req.body.stream;
+    }
+    // For anthropic text to chat requests, remove undefined prompt.
+    if (req.outboundApi === "anthropic-chat") {
+      delete req.body.prompt;
+    }
+
+    const serialized =
+      typeof req.body === "string" ? req.body : JSON.stringify(req.body);
+    manager.setHeader("Content-Length", String(Buffer.byteLength(serialized)));
+    manager.setBody(serialized);
+  }
+};

src/proxy/middleware/request/mutators/finalize-signed-request.ts

@@ -0,0 +1,32 @@
+import { ProxyReqMutator } from "../index";
+
+/**
+ * For AWS/GCP/Azure/Google requests, the body is signed earlier in the request
+ * pipeline, before the proxy middleware. This function just assigns the path
+ * and headers to the proxy request.
+ */
+export const finalizeSignedRequest: ProxyReqMutator = (manager) => {
+  const req = manager.request;
+  if (!req.signedRequest) {
+    throw new Error("Expected req.signedRequest to be set");
+  }
+
+  // The path depends on the selected model and the assigned key's region.
+  manager.setPath(req.signedRequest.path);
+
+  // Amazon doesn't want extra headers, so we need to remove all of them and
+  // reassign only the ones specified in the signed request.
+  const headers = req.signedRequest.headers;
+  Object.keys(headers).forEach((key) => {
+    manager.removeHeader(key);
+  });
+  Object.entries(req.signedRequest.headers).forEach(([key, value]) => {
+    manager.setHeader(key, value);
+  });
+  const serialized =
+    typeof req.signedRequest.body === "string"
+      ? req.signedRequest.body
+      : JSON.stringify(req.signedRequest.body);
+  manager.setHeader("Content-Length", String(Buffer.byteLength(serialized)));
+  manager.setBody(serialized);
+};

src/proxy/middleware/request/mutators/sign-aws-request.ts

@@ -0,0 +1,148 @@
+import express, { Request } from "express";
+import { Sha256 } from "@aws-crypto/sha256-js";
+import { SignatureV4 } from "@smithy/signature-v4";
+import { HttpRequest } from "@smithy/protocol-http";
+import {
+  AnthropicV1TextSchema,
+  AnthropicV1MessagesSchema,
+} from "../../../../shared/api-schemas";
+import { AwsBedrockKey, keyPool } from "../../../../shared/key-management";
+import {
+  AWSMistralV1ChatCompletionsSchema,
+  AWSMistralV1TextCompletionsSchema,
+} from "../../../../shared/api-schemas/mistral-ai";
+import { ProxyReqMutator } from "../index";
+
+const AMZ_HOST =
+  process.env.AMZ_HOST || "bedrock-runtime.%REGION%.amazonaws.com";
+
+/**
+ * Signs an outgoing AWS request with the appropriate headers modifies the
+ * request object in place to fix the path.
+ * This happens AFTER request transformation.
+ */
+export const signAwsRequest: ProxyReqMutator = async (manager) => {
+  const req = manager.request;
+  const { model, stream } = req.body;
+  const key = keyPool.get(model, "aws") as AwsBedrockKey;
+  manager.setKey(key);
+
+  const credential = getCredentialParts(req);
+  const host = AMZ_HOST.replace("%REGION%", credential.region);
+
+  // AWS only uses 2023-06-01 and does not actually check this header, but we
+  // set it so that the stream adapter always selects the correct transformer.
+  manager.setHeader("anthropic-version", "2023-06-01");
+
+  // If our key has an inference profile compatible with the requested model,
+  // we want to use the inference profile instead of the model ID when calling
+  // InvokeModel as that will give us higher rate limits.
+  const profile =
+    key.inferenceProfileIds.find((p) => p.includes(model)) || model;
+
+  // Uses the AWS SDK to sign a request, then modifies our HPM proxy request
+  // with the headers generated by the SDK.
+  const newRequest = new HttpRequest({
+    method: "POST",
+    protocol: "https:",
+    hostname: host,
+    path: `/model/${profile}/invoke${stream ? "-with-response-stream" : ""}`,
+    headers: {
+      ["Host"]: host,
+      ["content-type"]: "application/json",
+    },
+    body: JSON.stringify(getStrictlyValidatedBodyForAws(req)),
+  });
+
+  if (stream) {
+    newRequest.headers["x-amzn-bedrock-accept"] = "application/json";
+  } else {
+    newRequest.headers["accept"] = "*/*";
+  }
+
+  const { body, inboundApi, outboundApi } = req;
+  req.log.info(
+    { key: key.hash, model: body.model, profile, inboundApi, outboundApi },
+    "Assigned AWS credentials to request"
+  );
+
+  manager.setSignedRequest(await sign(newRequest, getCredentialParts(req)));
+};
+
+type Credential = {
+  accessKeyId: string;
+  secretAccessKey: string;
+  region: string;
+};
+
+function getCredentialParts(req: express.Request): Credential {
+  const [accessKeyId, secretAccessKey, region] = req.key!.key.split(":");
+
+  if (!accessKeyId || !secretAccessKey || !region) {
+    req.log.error(
+      { key: req.key!.hash },
+      "AWS_CREDENTIALS isn't correctly formatted; refer to the docs"
+    );
+    throw new Error("The key assigned to this request is invalid.");
+  }
+
+  return { accessKeyId, secretAccessKey, region };
+}
+
+async function sign(request: HttpRequest, credential: Credential) {
+  const { accessKeyId, secretAccessKey, region } = credential;
+
+  const signer = new SignatureV4({
+    sha256: Sha256,
+    credentials: { accessKeyId, secretAccessKey },
+    region,
+    service: "bedrock",
+  });
+
+  return signer.sign(request);
+}
+
+function getStrictlyValidatedBodyForAws(req: Readonly<Request>): unknown {
+  // AWS uses vendor API formats but imposes additional (more strict) validation
+  // rules, namely that extraneous parameters are not allowed. We will validate
+  // using the vendor's zod schema but apply `.strip` to ensure that any
+  // extraneous parameters are removed.
+  let strippedParams: Record<string, unknown> = {};
+  switch (req.outboundApi) {
+    case "anthropic-text":
+      strippedParams = AnthropicV1TextSchema.pick({
+        prompt: true,
+        max_tokens_to_sample: true,
+        stop_sequences: true,
+        temperature: true,
+        top_k: true,
+        top_p: true,
+      })
+        .strip()
+        .parse(req.body);
+      break;
+    case "anthropic-chat":
+      strippedParams = AnthropicV1MessagesSchema.pick({
+        messages: true,
+        system: true,
+        max_tokens: true,
+        stop_sequences: true,
+        temperature: true,
+        top_k: true,
+        top_p: true,
+      })
+        .strip()
+        .parse(req.body);
+      strippedParams.anthropic_version = "bedrock-2023-05-31";
+      break;
+    case "mistral-ai":
+      strippedParams = AWSMistralV1ChatCompletionsSchema.parse(req.body);
+      break;
+    case "mistral-text":
+      strippedParams = AWSMistralV1TextCompletionsSchema.parse(req.body);
+      break;
+    default:
+      throw new Error("Unexpected outbound API for AWS.");
+  }
+  return strippedParams;
+}

src/proxy/middleware/request/mutators/sign-vertex-ai-request.ts

@@ -0,0 +1,75 @@
+import { AnthropicV1MessagesSchema } from "../../../../shared/api-schemas";
+import { GcpKey, keyPool } from "../../../../shared/key-management";
+import { ProxyReqMutator } from "../index";
+import {
+  getCredentialsFromGcpKey,
+  refreshGcpAccessToken,
+} from "../../../../shared/key-management/gcp/oauth";
+
+const GCP_HOST = process.env.GCP_HOST || "%REGION%-aiplatform.googleapis.com";
+
+export const signGcpRequest: ProxyReqMutator = async (manager) => {
+  const req = manager.request;
+  const serviceValid = req.service === "gcp";
+  if (!serviceValid) {
+    throw new Error("addVertexAIKey called on invalid request");
+  }
+
+  if (!req.body?.model) {
+    throw new Error("You must specify a model with your request.");
+  }
+
+  const { model } = req.body;
+  const key: GcpKey = keyPool.get(model, "gcp") as GcpKey;
+
+  if (!key.accessToken || Date.now() > key.accessTokenExpiresAt) {
+    const [token, durationSec] = await refreshGcpAccessToken(key);
+    keyPool.update(key, {
+      accessToken: token,
+      accessTokenExpiresAt: Date.now() + durationSec * 1000 * 0.95,
+    } as GcpKey);
+    // nb: key received by `get` is a clone and will not have the new access
+    // token we just set, so it must be manually updated.
+    key.accessToken = token;
+  }
+
+  manager.setKey(key);
+  req.log.info({ key: key.hash, model }, "Assigned GCP key to request");
+
+  // TODO: This should happen in transform-outbound-payload.ts
+  // TODO: Support tools
+  let strippedParams: Record<string, unknown>;
+  strippedParams = AnthropicV1MessagesSchema.pick({
+    messages: true,
+    system: true,
+    max_tokens: true,
+    stop_sequences: true,
+    temperature: true,
+    top_k: true,
+    top_p: true,
+    stream: true,
+  })
+    .strip()
+    .parse(req.body);
+  strippedParams.anthropic_version = "vertex-2023-10-16";
+
+  const credential = await getCredentialsFromGcpKey(key);
+
+  const host = GCP_HOST.replace("%REGION%", credential.region);
+  // GCP doesn't use the anthropic-version header, but we set it to ensure the
+  // stream adapter selects the correct transformer.
+  manager.setHeader("anthropic-version", "2023-06-01");
+
+  manager.setSignedRequest({
+    method: "POST",
+    protocol: "https:",
+    hostname: host,
+    path: `/v1/projects/${credential.projectId}/locations/${credential.region}/publishers/anthropic/models/${model}:streamRawPredict`,
+    headers: {
+      ["host"]: host,
+      ["content-type"]: "application/json",
+      ["authorization"]: `Bearer ${key.accessToken}`,
+    },
+    body: JSON.stringify(strippedParams),
+  });
+};

src/proxy/middleware/request/mutators/strip-headers.ts

@@ -0,0 +1,33 @@
+import { ProxyReqMutator } from "../index";
+
+/**
+ * Removes origin and referer headers before sending the request to the API for
+ * privacy reasons.
+ */
+export const stripHeaders: ProxyReqMutator = (manager) => {
+  manager.removeHeader("origin");
+  manager.removeHeader("referer");
+
+  // Some APIs refuse requests coming from browsers to discourage embedding
+  // API keys in client-side code, so we must remove all CORS/fetch headers.
+  Object.keys(manager.request.headers).forEach((key) => {
+    if (key.startsWith("sec-")) {
+      manager.removeHeader(key);
+    }
+  });
+
+  manager.removeHeader("tailscale-user-login");
+  manager.removeHeader("tailscale-user-name");
+  manager.removeHeader("tailscale-headers-info");
+  manager.removeHeader("tailscale-user-profile-pic");
+  manager.removeHeader("cf-connecting-ip");
+  manager.removeHeader("cf-ray");
+  manager.removeHeader("cf-visitor");
+  manager.removeHeader("cf-warp-tag-id");
+  manager.removeHeader("forwarded");
+  manager.removeHeader("true-client-ip");
+  manager.removeHeader("x-forwarded-for");
+  manager.removeHeader("x-forwarded-host");
+  manager.removeHeader("x-forwarded-proto");
+  manager.removeHeader("x-real-ip");
+};

src/proxy/middleware/request/onproxyreq-factory.ts

@@ -1,45 +0,0 @@
-import {
-  applyQuotaLimits,
-  blockZoomerOrigins,
-  checkModelFamily,
-  HPMRequestCallback,
-  stripHeaders,
-} from "./index";
-
-type ProxyReqHandlerFactoryOptions = { pipeline: HPMRequestCallback[] };
-
-/**
- * Returns an http-proxy-middleware request handler that runs the given set of
- * onProxyReq callback functions in sequence.
- *
- * These will run each time a request is proxied, including on automatic retries
- * by the queue after encountering a rate limit.
- */
-export const createOnProxyReqHandler = ({
-  pipeline,
-}: ProxyReqHandlerFactoryOptions): HPMRequestCallback => {
-  const callbackPipeline = [
-    checkModelFamily,
-    applyQuotaLimits,
-    blockZoomerOrigins,
-    stripHeaders,
-    ...pipeline,
-  ];
-  return (proxyReq, req, res, options) => {
-    // The streaming flag must be set before any other onProxyReq handler runs,
-    // as it may influence the behavior of subsequent handlers.
-    // Image generation requests can't be streamed.
-    // TODO: this flag is set in too many places
-    req.isStreaming =
-      req.isStreaming || req.body.stream === true || req.body.stream === "true";
-    req.body.stream = req.isStreaming;
-
-    try {
-      for (const fn of callbackPipeline) {
-        fn(proxyReq, req, res, options);
-      }
-    } catch (error) {
-      proxyReq.destroy(error);
-    }
-  };
-};

src/proxy/middleware/request/onproxyreq/add-anthropic-preamble.ts

@@ -1,33 +0,0 @@
-import { AnthropicKey, Key } from "../../../../shared/key-management";
-import { isTextGenerationRequest } from "../../common";
-import { HPMRequestCallback } from "../index";
-
-/**
- * Some keys require the prompt to start with `\n\nHuman:`. There is no way to
- * know this without trying to send the request and seeing if it fails. If a
- * key is marked as requiring a preamble, it will be added here.
- */
-export const addAnthropicPreamble: HPMRequestCallback = (_proxyReq, req) => {
-  if (
-    !isTextGenerationRequest(req) ||
-    req.key?.service !== "anthropic" ||
-    req.outboundApi !== "anthropic-text"
-  ) {
-    return;
-  }
-
-  let preamble = "";
-  let prompt = req.body.prompt;
-  assertAnthropicKey(req.key);
-  if (req.key.requiresPreamble && prompt) {
-    preamble = prompt.startsWith("\n\nHuman:") ? "" : "\n\nHuman:";
-    req.log.debug({ key: req.key.hash, preamble }, "Adding preamble to prompt");
-  }
-  req.body.prompt = preamble + prompt;
-};
-
-function assertAnthropicKey(key: Key): asserts key is AnthropicKey {
-  if (key.service !== "anthropic") {
-    throw new Error(`Expected an Anthropic key, got '${key.service}'`);
-  }
-}

src/proxy/middleware/request/onproxyreq/finalize-body.ts

@@ -1,23 +0,0 @@
-import { fixRequestBody } from "http-proxy-middleware";
-import type { HPMRequestCallback } from "../index";
-
-/** Finalize the rewritten request body. Must be the last rewriter. */
-export const finalizeBody: HPMRequestCallback = (proxyReq, req) => {
-  if (["POST", "PUT", "PATCH"].includes(req.method ?? "") && req.body) {
-    // For image generation requests, remove stream flag.
-    if (req.outboundApi === "openai-image") {
-      delete req.body.stream;
-    }
-    // For anthropic text to chat requests, remove undefined prompt.
-    if (req.outboundApi === "anthropic-chat") {
-      delete req.body.prompt;
-    }
-
-    const updatedBody = JSON.stringify(req.body);
-    proxyReq.setHeader("Content-Length", Buffer.byteLength(updatedBody));
-    (req as any).rawBody = Buffer.from(updatedBody);
-
-    // body-parser and http-proxy-middleware don't play nice together
-    fixRequestBody(proxyReq, req);
-  }
-};

src/proxy/middleware/request/onproxyreq/finalize-signed-request.ts

@@ -1,26 +0,0 @@
-import type { HPMRequestCallback } from "../index";
-
-/**
- * For AWS/Azure/Google requests, the body is signed earlier in the request
- * pipeline, before the proxy middleware. This function just assigns the path
- * and headers to the proxy request.
- */
-export const finalizeSignedRequest: HPMRequestCallback = (proxyReq, req) => {
-  if (!req.signedRequest) {
-    throw new Error("Expected req.signedRequest to be set");
-  }
-
-  // The path depends on the selected model and the assigned key's region.
-  proxyReq.path = req.signedRequest.path;
-
-  // Amazon doesn't want extra headers, so we need to remove all of them and
-  // reassign only the ones specified in the signed request.
-  proxyReq.getRawHeaderNames().forEach(proxyReq.removeHeader.bind(proxyReq));
-  Object.entries(req.signedRequest.headers).forEach(([key, value]) => {
-    proxyReq.setHeader(key, value);
-  });
-
-  // Don't use fixRequestBody here because it adds a content-length header.
-  // Amazon doesn't want that and it breaks the signature.
-  proxyReq.write(req.signedRequest.body);
-};

src/proxy/middleware/request/onproxyreq/strip-headers.ts

@@ -1,16 +0,0 @@
-import { HPMRequestCallback } from "../index";
-
-/**
- * Removes origin and referer headers before sending the request to the API for
- * privacy reasons.
- **/
-export const stripHeaders: HPMRequestCallback = (proxyReq) => {
-  proxyReq.setHeader("origin", "");
-  proxyReq.setHeader("referer", "");
-
-  proxyReq.removeHeader("cf-connecting-ip");
-  proxyReq.removeHeader("forwarded");
-  proxyReq.removeHeader("true-client-ip");
-  proxyReq.removeHeader("x-forwarded-for");
-  proxyReq.removeHeader("x-real-ip");
-};

src/proxy/middleware/request/preprocessor-factory.ts

@@ -4,11 +4,15 @@ import { initializeSseStream } from "../../../shared/streaming";
 import { classifyErrorAndSend } from "../common";
 import {
   RequestPreprocessor,
-  validateContextSize,
+  blockZoomerOrigins,
   countPromptTokens,
+  languageFilter,
   setApiFormat,
   transformOutboundPayload,
-  languageFilter,
+  validateContextSize,
+  validateModelFamily,
+  validateVision,
+  applyQuotaLimits,
 } from ".";
 
 type RequestPreprocessorOptions = {
@@ -29,14 +33,15 @@ type RequestPreprocessorOptions = {
 /**
  * Returns a middleware function that processes the request body into the given
  * API format, and then sequentially runs the given additional preprocessors.
+ * These should be used for validation and transformations that only need to
+ * happen once per request.
  *
  * These run first in the request lifecycle, a single time per request before it
  * is added to the request queue. They aren't run again if the request is
  * re-attempted after a rate limit.
  *
- * To run a preprocessor on every re-attempt, pass it to createQueueMiddleware.
- * It will run after these preprocessors, but before the request is sent to
- * http-proxy-middleware.
+ * To run functions against requests every time they are re-attempted, write a
+ * ProxyReqMutator and pass it to createQueuedProxyMiddleware instead.
  */
 export const createPreprocessorMiddleware = (
   apiFormat: Parameters<typeof setApiFormat>[0],
@@ -44,12 +49,16 @@ export const createPreprocessorMiddleware = (
 ): RequestHandler => {
   const preprocessors: RequestPreprocessor[] = [
     setApiFormat(apiFormat),
+    blockZoomerOrigins,
     ...(beforeTransform ?? []),
     transformOutboundPayload,
     countPromptTokens,
     languageFilter,
     ...(afterTransform ?? []),
     validateContextSize,
+    validateVision,
+    validateModelFamily,
+    applyQuotaLimits,
   ];
   return async (...args) => executePreprocessors(preprocessors, args);
 };
@@ -81,10 +90,10 @@ async function executePreprocessors(
     next();
   } catch (error) {
     if (error.constructor.name === "ZodError") {
-      const msg = error?.issues
-        ?.map((issue: ZodIssue) => issue.message)
+      const issues = error?.issues
+        ?.map((issue: ZodIssue) => `${issue.path.join(".")}: ${issue.message}`)
         .join("; ");
-      req.log.info(msg, "Prompt validation failed.");
+      req.log.warn({ issues }, "Prompt failed preprocessor validation.");
     } else {
       req.log.error(error, "Error while executing request preprocessor");
     }
@@ -134,14 +143,21 @@ const handleTestMessage: RequestHandler = (req, res) => {
       completion: "Hello!",
       // anthropic chat
       content: [{ type: "text", text: "Hello!" }],
+      // gemini
+      candidates: [
+        {
+          content: { parts: [{ text: "Hello!" }] },
+          finishReason: "stop",
+        },
+      ],
       proxy_note:
-        "This response was generated by the proxy's test message handler and did not go to the API.",
+        "SillyTavern connection test detected. Your prompt was not sent to the actual model and this response was generated by the proxy.",
     });
   }
 };
 
 function isTestMessage(body: any) {
-  const { messages, prompt } = body;
+  const { messages, prompt, contents } = body;
 
   if (messages) {
     return (
@@ -149,6 +165,8 @@ function isTestMessage(body: any) {
       messages[0].role === "user" &&
       messages[0].content === "Hi"
     );
+  } else if (contents) {
+    return contents.length === 1 && contents[0].parts[0]?.text === "Hi";
   } else {
     return (
       prompt?.trim() === "Human: Hi\n\nAssistant:" ||

src/proxy/middleware/request/preprocessors/add-google-ai-key.ts

@@ -1,40 +0,0 @@
-import { keyPool } from "../../../../shared/key-management";
-import { RequestPreprocessor } from "../index";
-
-export const addGoogleAIKey: RequestPreprocessor = (req) => {
-  const apisValid = req.inboundApi === "openai" && req.outboundApi === "google-ai";
-  const serviceValid = req.service === "google-ai";
-  if (!apisValid || !serviceValid) {
-    throw new Error("addGoogleAIKey called on invalid request");
-  }
-
-  if (!req.body?.model) {
-    throw new Error("You must specify a model with your request.");
-  }
-
-  const model = req.body.model;
-  req.key = keyPool.get(model, "google-ai");
-
-  req.log.info(
-    { key: req.key.hash, model },
-    "Assigned Google AI API key to request"
-  );
-
-  // https://generativelanguage.googleapis.com/v1beta/models/$MODEL_ID:generateContent?key=$API_KEY
-  // https://generativelanguage.googleapis.com/v1beta/models/$MODEL_ID:streamGenerateContent?key=${API_KEY}
-
-  req.isStreaming = req.isStreaming || req.body.stream;
-  delete req.body.stream;
-
-  req.signedRequest = {
-    method: "POST",
-    protocol: "https:",
-    hostname: "generativelanguage.googleapis.com",
-    path: `/v1beta/models/${model}:${req.isStreaming ? "streamGenerateContent" : "generateContent"}?key=${req.key.key}`,
-    headers: {
-      ["host"]: `generativelanguage.googleapis.com`,
-      ["content-type"]: "application/json",
-    },
-    body: JSON.stringify(req.body),
-  };
-};

src/proxy/middleware/request/preprocessors/apply-quota-limits.ts

@@ -1,6 +1,6 @@
 import { hasAvailableQuota } from "../../../../shared/users/user-store";
 import { isImageGenerationRequest, isTextGenerationRequest } from "../../common";
-import { HPMRequestCallback } from "../index";
+import { RequestPreprocessor } from "../index";
 
 export class QuotaExceededError extends Error {
   public quotaInfo: any;
@@ -11,7 +11,7 @@ export class QuotaExceededError extends Error {
   }
 }
 
-export const applyQuotaLimits: HPMRequestCallback = (_proxyReq, req) => {
+export const applyQuotaLimits: RequestPreprocessor = (req) => {
   const subjectToQuota =
     isTextGenerationRequest(req) || isImageGenerationRequest(req);
   if (!subjectToQuota || !req.user) return;

src/proxy/middleware/request/preprocessors/block-zoomer-origins.ts

@@ -1,4 +1,4 @@
-import { HPMRequestCallback } from "../index";
+import { RequestPreprocessor } from "../index";
 
 const DISALLOWED_ORIGIN_SUBSTRINGS = "janitorai.com,janitor.ai".split(",");
 
@@ -13,7 +13,7 @@ class ZoomerForbiddenError extends Error {
  * Blocks requests from Janitor AI users with a fake, scary error message so I
  * stop getting emails asking for tech support.
  */
-export const blockZoomerOrigins: HPMRequestCallback = (_proxyReq, req) => {
+export const blockZoomerOrigins: RequestPreprocessor = (req) => {
   const origin = req.headers.origin || req.headers.referer;
   if (origin && DISALLOWED_ORIGIN_SUBSTRINGS.some((s) => origin.includes(s))) {
     // Venus-derivatives send a test prompt to check if the proxy is working.

src/proxy/middleware/request/preprocessors/count-prompt-tokens.ts

@@ -2,7 +2,6 @@ import { RequestPreprocessor } from "../index";
 import { countTokens } from "../../../../shared/tokenization";
 import { assertNever } from "../../../../shared/utils";
 import {
-  AnthropicChatMessage,
   GoogleAIChatMessage,
   MistralAIChatMessage,
   OpenAIChatMessage,
@@ -18,7 +17,7 @@ export const countPromptTokens: RequestPreprocessor = async (req) => {
 
   switch (service) {
     case "openai": {
-      req.outputTokens = req.body.max_tokens;
+      req.outputTokens = req.body.max_completion_tokens || req.body.max_tokens;
       const prompt: OpenAIChatMessage[] = req.body.messages;
       result = await countTokens({ req, prompt, service });
       break;
@@ -31,7 +30,13 @@ export const countPromptTokens: RequestPreprocessor = async (req) => {
     }
     case "anthropic-chat": {
       req.outputTokens = req.body.max_tokens;
-      const prompt: AnthropicChatMessage[] = req.body.messages;
+      let system = req.body.system ?? "";
+      if (Array.isArray(system)) {
+        system = system
+          .map((m: { type: string; text: string }) => m.text)
+          .join("\n");
+      }
+      const prompt = { system, messages: req.body.messages };
       result = await countTokens({ req, prompt, service });
       break;
     }
@@ -47,9 +52,11 @@ export const countPromptTokens: RequestPreprocessor = async (req) => {
       result = await countTokens({ req, prompt, service });
       break;
     }
-    case "mistral-ai": {
+    case "mistral-ai":
+    case "mistral-text": {
       req.outputTokens = req.body.max_tokens;
-      const prompt: MistralAIChatMessage[] = req.body.messages;
+      const prompt: string | MistralAIChatMessage[] =
+        req.body.messages ?? req.body.prompt;
       result = await countTokens({ req, prompt, service });
       break;
     }

src/proxy/middleware/request/preprocessors/language-filter.ts

@@ -1,4 +1,5 @@
 import { Request } from "express";
+import { z } from "zod";
 import { config } from "../../../../config";
 import { assertNever } from "../../../../shared/utils";
 import { RequestPreprocessor } from "../index";
@@ -8,6 +9,7 @@ import {
   OpenAIChatMessage,
   flattenAnthropicMessages,
 } from "../../../../shared/api-schemas";
+import { GoogleAIV1GenerateContentSchema } from "../../../../shared/api-schemas/google-ai";
 
 const rejectedClients = new Map<string, number>();
 
@@ -50,14 +52,16 @@ export const languageFilter: RequestPreprocessor = async (req) => {
   }
 };
 
+/* 
+TODO: this is not type safe and does not raise errors if request body zod schema
+is changed.
+*/
 function getPromptFromRequest(req: Request) {
   const service = req.outboundApi;
   const body = req.body;
   switch (service) {
     case "anthropic-chat":
       return flattenAnthropicMessages(body.messages);
-    case "anthropic-text":
-      return body.prompt;
     case "openai":
     case "mistral-ai":
       return body.messages
@@ -72,11 +76,18 @@ function getPromptFromRequest(req: Request) {
           return `${msg.role}: ${text}`;
         })
         .join("\n\n");
+    case "anthropic-text":
     case "openai-text":
     case "openai-image":
+    case "mistral-text":
       return body.prompt;
-    case "google-ai":
-      return body.prompt.text;
+    case "google-ai": {
+      const b = body as z.infer<typeof GoogleAIV1GenerateContentSchema>;
+      return [
+        b.systemInstruction?.parts.map((p) => p.text),
+        ...b.contents.flatMap((c) => c.parts.map((p) => p.text)),
+      ].join("\n");
+    }
     default:
       assertNever(service);
   }

src/proxy/middleware/request/preprocessors/set-api-format.ts

@@ -4,8 +4,22 @@ import { LLMService } from "../../../../shared/models";
 import { RequestPreprocessor } from "../index";
 
 export const setApiFormat = (api: {
+  /**
+   * The API format the user made the request in and expects the response to be
+   * in.
+   */
   inApi: Request["inboundApi"];
+  /**
+   * The API format the proxy will make the request in and expects the response
+   * to be in. If different from `inApi`, the proxy will transform the user's
+   * request body to this format, and will transform the response body or stream
+   * events from this format.
+   */
   outApi: APIFormat;
+  /**
+   * The service the request will be sent to, which determines authentication
+   * and possibly the streaming transport.
+   */
   service: LLMService;
 }): RequestPreprocessor => {
   return function configureRequestApiFormat(req) {

src/proxy/middleware/request/preprocessors/sign-aws-request.ts

@@ -1,129 +0,0 @@
-import express from "express";
-import { Sha256 } from "@aws-crypto/sha256-js";
-import { SignatureV4 } from "@smithy/signature-v4";
-import { HttpRequest } from "@smithy/protocol-http";
-import {
-  AnthropicV1TextSchema,
-  AnthropicV1MessagesSchema,
-} from "../../../../shared/api-schemas";
-import { keyPool } from "../../../../shared/key-management";
-import { RequestPreprocessor } from "../index";
-
-const AMZ_HOST =
-  process.env.AMZ_HOST || "bedrock-runtime.%REGION%.amazonaws.com";
-
-/**
- * Signs an outgoing AWS request with the appropriate headers modifies the
- * request object in place to fix the path.
- * This happens AFTER request transformation.
- */
-export const signAwsRequest: RequestPreprocessor = async (req) => {
-  const { model, stream } = req.body;
-  req.key = keyPool.get(model, "aws");
-
-  req.isStreaming = stream === true || stream === "true";
-
-  // same as addAnthropicPreamble for non-AWS requests, but has to happen here
-  if (req.outboundApi === "anthropic-text") {
-    let preamble = req.body.prompt.startsWith("\n\nHuman:") ? "" : "\n\nHuman:";
-    req.body.prompt = preamble + req.body.prompt;
-  }
-
-  // AWS uses mostly the same parameters as Anthropic, with a few removed params
-  // and much stricter validation on unused parameters. Rather than treating it
-  // as a separate schema we will use the anthropic ones and strip the unused
-  // parameters.
-  // TODO: This should happen in transform-outbound-payload.ts
-  let strippedParams: Record<string, unknown>;
-  if (req.outboundApi === "anthropic-chat") {
-    strippedParams = AnthropicV1MessagesSchema.pick({
-      messages: true,
-      max_tokens: true,
-      stop_sequences: true,
-      temperature: true,
-      top_k: true,
-      top_p: true,
-    })
-      .strip()
-      .parse(req.body);
-    strippedParams.anthropic_version = "bedrock-2023-05-31";
-  } else {
-    strippedParams = AnthropicV1TextSchema.pick({
-      prompt: true,
-      max_tokens_to_sample: true,
-      stop_sequences: true,
-      temperature: true,
-      top_k: true,
-      top_p: true,
-    })
-      .strip()
-      .parse(req.body);
-  }
-
-  const credential = getCredentialParts(req);
-  const host = AMZ_HOST.replace("%REGION%", credential.region);
-  // AWS only uses 2023-06-01 and does not actually check this header, but we
-  // set it so that the stream adapter always selects the correct transformer.
-  req.headers["anthropic-version"] = "2023-06-01";
-
-  // Uses the AWS SDK to sign a request, then modifies our HPM proxy request
-  // with the headers generated by the SDK.
-  const newRequest = new HttpRequest({
-    method: "POST",
-    protocol: "https:",
-    hostname: host,
-    path: `/model/${model}/invoke${stream ? "-with-response-stream" : ""}`,
-    headers: {
-      ["Host"]: host,
-      ["content-type"]: "application/json",
-    },
-    body: JSON.stringify(strippedParams),
-  });
-
-  if (stream) {
-    newRequest.headers["x-amzn-bedrock-accept"] = "application/json";
-  } else {
-    newRequest.headers["accept"] = "*/*";
-  }
-
-  const { key, body, inboundApi, outboundApi } = req;
-  req.log.info(
-    { key: key.hash, model: body.model, inboundApi, outboundApi },
-    "Assigned AWS credentials to request"
-  );
-
-  req.signedRequest = await sign(newRequest, getCredentialParts(req));
-};
-
-type Credential = {
-  accessKeyId: string;
-  secretAccessKey: string;
-  region: string;
-};
-
-function getCredentialParts(req: express.Request): Credential {
-  const [accessKeyId, secretAccessKey, region] = req.key!.key.split(":");
-
-  if (!accessKeyId || !secretAccessKey || !region) {
-    req.log.error(
-      { key: req.key!.hash },
-      "AWS_CREDENTIALS isn't correctly formatted; refer to the docs"
-    );
-    throw new Error("The key assigned to this request is invalid.");
-  }
-
-  return { accessKeyId, secretAccessKey, region };
-}
-
-async function sign(request: HttpRequest, credential: Credential) {
-  const { accessKeyId, secretAccessKey, region } = credential;
-
-  const signer = new SignatureV4({
-    sha256: Sha256,
-    credentials: { accessKeyId, secretAccessKey },
-    region,
-    service: "bedrock",
-  });
-
-  return signer.sign(request);
-}

src/proxy/middleware/request/preprocessors/transform-outbound-payload.ts

@@ -1,3 +1,4 @@
+import { Request } from "express";
 import {
   API_REQUEST_VALIDATORS,
   API_REQUEST_TRANSFORMERS,
@@ -12,41 +13,39 @@ import { RequestPreprocessor } from "../index";
 
 /** Transforms an incoming request body to one that matches the target API. */
 export const transformOutboundPayload: RequestPreprocessor = async (req) => {
-  const sameService = req.inboundApi === req.outboundApi;
   const alreadyTransformed = req.retryCount > 0;
   const notTransformable =
     !isTextGenerationRequest(req) && !isImageGenerationRequest(req);
 
-  if (alreadyTransformed || notTransformable) return;
-
-  // TODO: this should be an APIFormatTransformer
-  if (req.inboundApi === "mistral-ai") {
-    const messages = req.body.messages;
-    req.body.messages = fixMistralPrompt(messages);
-    req.log.info(
-      { old: messages.length, new: req.body.messages.length },
-      "Fixed Mistral prompt"
+  if (alreadyTransformed) {
+    return;
+  } else if (notTransformable) {
+    // This is probably an indication of a bug in the proxy.
+    const { inboundApi, outboundApi, method, path } = req;
+    req.log.warn(
+      { inboundApi, outboundApi, method, path },
+      "`transformOutboundPayload` called on a non-transformable request."
     );
-  }
-
-  if (sameService) {
-    const result = API_REQUEST_VALIDATORS[req.inboundApi].safeParse(req.body);
-    if (!result.success) {
-      req.log.warn(
-        { issues: result.error.issues, body: req.body },
-        "Request validation failed"
-      );
-      throw result.error;
-    }
-    req.body = result.data;
     return;
   }
 
+  applyMistralPromptFixes(req);
+
+  // Native prompts are those which were already provided by the client in the
+  // target API format. We don't need to transform them.
+  const isNativePrompt = req.inboundApi === req.outboundApi;
+  if (isNativePrompt) {
+    const result = API_REQUEST_VALIDATORS[req.inboundApi].parse(req.body);
+    req.body = result;
+    return;
+  }
+
+  // Prompt requires translation from one API format to another.
   const transformation = `${req.inboundApi}->${req.outboundApi}` as const;
   const transFn = API_REQUEST_TRANSFORMERS[transformation];
 
   if (transFn) {
-    req.log.info({ transformation }, "Transforming request");
+    req.log.info({ transformation }, "Transforming request...");
     req.body = await transFn(req);
     return;
   }
@@ -55,3 +54,36 @@ export const transformOutboundPayload: RequestPreprocessor = async (req) => {
     `${transformation} proxying is not supported. Make sure your client is configured to send requests in the correct format and to the correct endpoint.`
   );
 };
+
+// handles weird cases that don't fit into our abstractions
+function applyMistralPromptFixes(req: Request): void {
+  if (req.inboundApi === "mistral-ai") {
+    // Mistral Chat is very similar to OpenAI but not identical and many clients
+    // don't properly handle the differences. We will try to validate the
+    // mistral prompt and try to fix it if it fails. It will be re-validated
+    // after this function returns.
+    const result = API_REQUEST_VALIDATORS["mistral-ai"].parse(req.body);
+    req.body.messages = fixMistralPrompt(result.messages);
+    req.log.info(
+      { n: req.body.messages.length, prev: result.messages.length },
+      "Applied Mistral chat prompt fixes."
+    );
+
+    // If the prompt relies on `prefix: true` for the last message, we need to
+    // convert it to a text completions request because AWS Mistral support for
+    // this feature is broken.
+    // On Mistral La Plateforme, we can't do this because they don't expose
+    // a text completions endpoint.
+    const { messages } = req.body;
+    const lastMessage = messages && messages[messages.length - 1];
+    if (lastMessage?.role === "assistant" && req.service === "aws") {
+      // enable prefix if client forgot, otherwise the template will insert an
+      // eos token which is very unlikely to be what the client wants.
+      lastMessage.prefix = true;
+      req.outboundApi = "mistral-text";
+      req.log.info(
+        "Native Mistral chat prompt relies on assistant message prefix. Converting to text completions request."
+      );
+    }
+  }
+}

src/proxy/middleware/request/preprocessors/validate-context-size.ts

@@ -6,8 +6,9 @@ import { RequestPreprocessor } from "../index";
 
 const CLAUDE_MAX_CONTEXT = config.maxContextTokensAnthropic;
 const OPENAI_MAX_CONTEXT = config.maxContextTokensOpenAI;
-const GOOGLE_AI_MAX_CONTEXT = 32000;
-const MISTRAL_AI_MAX_CONTENT = 32768;
+// todo: make configurable
+const GOOGLE_AI_MAX_CONTEXT = 2048000;
+const MISTRAL_AI_MAX_CONTENT = 131072;
 
 /**
  * Assigns `req.promptTokens` and `req.outputTokens` based on the request body
@@ -37,6 +38,7 @@ export const validateContextSize: RequestPreprocessor = async (req) => {
       proxyMax = GOOGLE_AI_MAX_CONTEXT;
       break;
     case "mistral-ai":
+    case "mistral-text":
       proxyMax = MISTRAL_AI_MAX_CONTENT;
       break;
     case "openai-image":
@@ -46,17 +48,32 @@ export const validateContextSize: RequestPreprocessor = async (req) => {
   }
   proxyMax ||= Number.MAX_SAFE_INTEGER;
 
+  if (req.user?.type === "special") {
+    req.log.debug("Special user, not enforcing proxy context limit.");
+    proxyMax = Number.MAX_SAFE_INTEGER;
+  }
+
   let modelMax: number;
   if (model.match(/gpt-3.5-turbo-16k/)) {
     modelMax = 16384;
+  } else if (model.match(/^gpt-4o/)) {
+    modelMax = 128000;
+  } else if (model.match(/^chatgpt-4o/)) {
+    modelMax = 128000;
+  } else if (model.match(/gpt-4-turbo(-\d{4}-\d{2}-\d{2})?$/)) {
+    modelMax = 131072;
   } else if (model.match(/gpt-4-turbo(-preview)?$/)) {
     modelMax = 131072;
   } else if (model.match(/gpt-4-(0125|1106)(-preview)?$/)) {
     modelMax = 131072;
   } else if (model.match(/^gpt-4(-\d{4})?-vision(-preview)?$/)) {
     modelMax = 131072;
+  } else if (model.match(/^o1-mini(-\d{4}-\d{2}-\d{2})?$/)) {
+    modelMax = 128000;
+  } else if (model.match(/^o1(-preview)?(-\d{4}-\d{2}-\d{2})?$/)) {
+    modelMax = 128000;
   } else if (model.match(/gpt-3.5-turbo/)) {
-    modelMax = 4096;
+    modelMax = 16384;
   } else if (model.match(/gpt-4-32k/)) {
     modelMax = 32768;
   } else if (model.match(/gpt-4/)) {
@@ -71,17 +88,19 @@ export const validateContextSize: RequestPreprocessor = async (req) => {
     modelMax = 200000;
   } else if (model.match(/^claude-3/)) {
     modelMax = 200000;
-  } else if (model.match(/^gemini-\d{3}$/)) {
-    modelMax = GOOGLE_AI_MAX_CONTEXT;
-  } else if (model.match(/^mistral-(tiny|small|medium)$/)) {
-    modelMax = MISTRAL_AI_MAX_CONTENT;
-  } else if (model.match(/^anthropic\.claude-3-sonnet/)) {
+  } else if (model.match(/^gemini-/)) {
+    modelMax = 1024000;
+  } else if (model.match(/^anthropic\.claude-3/)) {
     modelMax = 200000;
   } else if (model.match(/^anthropic\.claude-v2:\d/)) {
     modelMax = 200000;
   } else if (model.match(/^anthropic\.claude/)) {
-    // Not sure if AWS Claude has the same context limit as Anthropic Claude.
     modelMax = 100000;
+  } else if (model.match(/tral/)) {
+    // catches mistral, mixtral, codestral, mathstral, etc. mistral models have
+    // no name convention and wildly different context windows so this is a
+    // catch-all
+    modelMax = MISTRAL_AI_MAX_CONTENT;
   } else {
     req.log.warn({ model }, "Unknown model, using 200k token limit.");
     modelMax = 200000;

src/proxy/middleware/request/preprocessors/validate-model-family.ts

@@ -1,14 +1,16 @@
-import { HPMRequestCallback } from "../index";
 import { config } from "../../../../config";
 import { ForbiddenError } from "../../../../shared/errors";
 import { getModelFamilyForRequest } from "../../../../shared/models";
+import { RequestPreprocessor } from "../index";
 
 /**
  * Ensures the selected model family is enabled by the proxy configuration.
- **/
-export const checkModelFamily: HPMRequestCallback = (_proxyReq, req, res) => {
+ */
+export const validateModelFamily: RequestPreprocessor = (req) => {
   const family = getModelFamilyForRequest(req);
   if (!config.allowedModelFamilies.includes(family)) {
-    throw new ForbiddenError(`Model family '${family}' is not enabled on this proxy`);
+    throw new ForbiddenError(
+      `Model family '${family}' is not enabled on this proxy`
+    );
   }
 };

src/proxy/middleware/request/preprocessors/validate-vision.ts

@@ -0,0 +1,44 @@
+import { config } from "../../../../config";
+import { assertNever } from "../../../../shared/utils";
+import { RequestPreprocessor } from "../index";
+import { containsImageContent as containsImageContentOpenAI } from "../../../../shared/api-schemas/openai";
+import { containsImageContent as containsImageContentAnthropic } from "../../../../shared/api-schemas/anthropic";
+import { ForbiddenError } from "../../../../shared/errors";
+
+/**
+ * Rejects prompts containing images if multimodal prompts are disabled.
+ */
+export const validateVision: RequestPreprocessor = async (req) => {
+  if (req.service === undefined) {
+    throw new Error("Request service must be set before validateVision");
+  }
+
+  if (req.user?.type === "special") return;
+  if (config.allowedVisionServices.includes(req.service)) return;
+
+  // vision not allowed for req's service, block prompts with images
+  let hasImage = false;
+  switch (req.outboundApi) {
+    case "openai":
+      hasImage = containsImageContentOpenAI(req.body.messages);
+      break;
+    case "anthropic-chat":
+      hasImage = containsImageContentAnthropic(req.body.messages);
+      break;
+    case "anthropic-text":
+    case "google-ai":
+    case "mistral-ai":
+    case "mistral-text":
+    case "openai-image":
+    case "openai-text":
+      return;
+    default:
+      assertNever(req.outboundApi);
+  }
+
+  if (hasImage) {
+    throw new ForbiddenError(
+      "Prompts containing images are not permitted. Disable 'Send Inline Images' in your client and try again."
+    );
+  }
+};

src/proxy/middleware/request/proxy-middleware-factory.ts

@@ -0,0 +1,135 @@
+import { Request, Response } from "express";
+import http from "http";
+import ProxyServer from "http-proxy";
+import { Readable } from "stream";
+import {
+  createProxyMiddleware,
+  Options,
+  debugProxyErrorsPlugin,
+  proxyEventsPlugin,
+} from "http-proxy-middleware";
+import { ProxyReqMutator, stripHeaders } from "./index";
+import { createOnProxyResHandler, ProxyResHandlerWithBody } from "../response";
+import { createQueueMiddleware } from "../../queue";
+import { getHttpAgents } from "../../../shared/network";
+import { classifyErrorAndSend } from "../common";
+
+/**
+ * Options for the `createQueuedProxyMiddleware` factory function.
+ */
+type ProxyMiddlewareFactoryOptions = {
+  /**
+   * Functions which receive a ProxyReqManager and can modify the request before
+   * it is proxied. The modifications will be automatically reverted if the
+   * request needs to be returned to the queue.
+   */
+  mutations?: ProxyReqMutator[];
+  /**
+   * The target URL to proxy requests to. This can be a string or a function
+   * which accepts the request and returns a string.
+   */
+  target: string | Options<Request>["router"];
+  /**
+   * A function which receives the proxy response and the JSON-decoded request
+   * body. Only fired for non-streaming responses; streaming responses are
+   * handled in `handle-streaming-response.ts`.
+   */
+  blockingResponseHandler?: ProxyResHandlerWithBody;
+};
+
+/**
+ * Returns a middleware function that accepts incoming requests and places them
+ * into the request queue. When the request is dequeued, it is proxied to the
+ * target URL using the given options and middleware. Non-streaming responses
+ * are handled by the given `blockingResponseHandler`.
+ */
+export function createQueuedProxyMiddleware({
+  target,
+  mutations,
+  blockingResponseHandler,
+}: ProxyMiddlewareFactoryOptions) {
+  const hpmTarget = typeof target === "string" ? target : "https://setbyrouter";
+  const hpmRouter = typeof target === "function" ? target : undefined;
+
+  const [httpAgent, httpsAgent] = getHttpAgents();
+  const agent = hpmTarget.startsWith("http:") ? httpAgent : httpsAgent;
+
+  const proxyMiddleware = createProxyMiddleware<Request, Response>({
+    target: hpmTarget,
+    router: hpmRouter,
+    agent,
+    changeOrigin: true,
+    toProxy: true,
+    selfHandleResponse: typeof blockingResponseHandler === "function",
+    // Disable HPM logger plugin (requires re-adding the other default plugins).
+    // Contrary to name, debugProxyErrorsPlugin is not just for debugging and
+    // fixes several error handling/connection close issues in http-proxy core.
+    ejectPlugins: true,
+    // Inferred (via Options<express.Request>) as Plugin<express.Request>, but
+    // the default plugins only allow http.IncomingMessage for TReq. They are
+    // compatible with express.Request, so we can use them. `Plugin` type is not
+    // exported for some reason.
+    plugins: [
+      debugProxyErrorsPlugin,
+      pinoLoggerPlugin,
+      proxyEventsPlugin,
+    ] as any,
+    on: {
+      proxyRes: createOnProxyResHandler(
+        blockingResponseHandler ? [blockingResponseHandler] : []
+      ),
+      error: classifyErrorAndSend,
+    },
+    buffer: ((req: Request) => {
+      // This is a hack/monkey patch and is not part of the official
+      // http-proxy-middleware package. See patches/http-proxy+1.18.1.patch.
+      let payload = req.body;
+      if (typeof payload === "string") {
+        payload = Buffer.from(payload);
+      }
+      const stream = new Readable();
+      stream.push(payload);
+      stream.push(null);
+      return stream;
+    }) as any,
+  });
+
+  return createQueueMiddleware({
+    mutations: [stripHeaders, ...(mutations ?? [])],
+    proxyMiddleware,
+  });
+}
+
+type ProxiedResponse = http.IncomingMessage & Response & any;
+function pinoLoggerPlugin(proxyServer: ProxyServer<Request>) {
+  proxyServer.on("error", (err, req, res, target) => {
+    req.log.error(
+      { originalUrl: req.originalUrl, targetUrl: String(target), err },
+      "Error occurred while proxying request to target"
+    );
+  });
+  proxyServer.on("proxyReq", (proxyReq, req) => {
+    const { protocol, host, path } = proxyReq;
+    req.log.info(
+      {
+        from: req.originalUrl,
+        to: `${protocol}//${host}${path}`,
+      },
+      "Sending request to upstream API..."
+    );
+  });
+  proxyServer.on("proxyRes", (proxyRes: ProxiedResponse, req, _res) => {
+    const { protocol, host, path } = proxyRes.req;
+    req.log.info(
+      {
+        target: `${protocol}//${host}${path}`,
+        status: proxyRes.statusCode,
+        contentType: proxyRes.headers["content-type"],
+        contentEncoding: proxyRes.headers["content-encoding"],
+        contentLength: proxyRes.headers["content-length"],
+        transferEncoding: proxyRes.headers["transfer-encoding"],
+      },
+      "Got response from upstream API."
+    );
+  });
+}

src/proxy/middleware/request/proxy-req-manager.ts

@@ -0,0 +1,112 @@
+import { Request } from "express";
+import { Key } from "../../../shared/key-management";
+import { assertNever } from "../../../shared/utils";
+
+/**
+ * Represents a change to the request that will be reverted if the request
+ * fails.
+ */
+interface ProxyReqMutation {
+  target: "header" | "path" | "body" | "api-key" | "signed-request";
+  key?: string;
+  originalValue: any | undefined;
+}
+
+/**
+ * Manages a request's headers, body, and path, allowing them to be modified
+ * before the request is proxied and automatically reverted if the request
+ * needs to be retried.
+ */
+export class ProxyReqManager {
+  private req: Request;
+  private mutations: ProxyReqMutation[] = [];
+
+  /**
+   * A read-only proxy of the request object. Avoid changing any properties
+   * here as they will persist across retries.
+   */
+  public readonly request: Readonly<Request>;
+
+  constructor(req: Request) {
+    this.req = req;
+
+    this.request = new Proxy(req, {
+      get: (target, prop) => {
+        if (typeof prop === "string") return target[prop as keyof Request];
+        return undefined;
+      },
+    });
+  }
+
+  setHeader(name: string, newValue: string): void {
+    const originalValue = this.req.get(name);
+    this.mutations.push({ target: "header", key: name, originalValue });
+    this.req.headers[name.toLowerCase()] = newValue;
+  }
+
+  removeHeader(name: string): void {
+    const originalValue = this.req.get(name);
+    this.mutations.push({ target: "header", key: name, originalValue });
+    delete this.req.headers[name.toLowerCase()];
+  }
+
+  setBody(newBody: any): void {
+    const originalValue = this.req.body;
+    this.mutations.push({ target: "body", key: "body", originalValue });
+    this.req.body = newBody;
+  }
+
+  setKey(newKey: Key): void {
+    const originalValue = this.req.key;
+    this.mutations.push({ target: "api-key", key: "key", originalValue });
+    this.req.key = newKey;
+  }
+
+  setPath(newPath: string): void {
+    const originalValue = this.req.path;
+    this.mutations.push({ target: "path", key: "path", originalValue });
+    this.req.url = newPath;
+  }
+
+  setSignedRequest(newSignedRequest: typeof this.req.signedRequest): void {
+    const originalValue = this.req.signedRequest;
+    this.mutations.push({ target: "signed-request", key: "signedRequest", originalValue });
+    this.req.signedRequest = newSignedRequest;
+  }
+
+  hasChanged(): boolean {
+    return this.mutations.length > 0;
+  }
+
+  revert(): void {
+    for (const mutation of this.mutations.reverse()) {
+      switch (mutation.target) {
+        case "header":
+          if (mutation.originalValue === undefined) {
+            delete this.req.headers[mutation.key!.toLowerCase()];
+            continue;
+          } else {
+            this.req.headers[mutation.key!.toLowerCase()] =
+              mutation.originalValue;
+          }
+          break;
+        case "path":
+          this.req.url = mutation.originalValue;
+          break;
+        case "body":
+          this.req.body = mutation.originalValue;
+          break;
+        case "api-key":
+          // We don't reset the key here because it's not a property of the
+          // inbound request, so we'd only ever be reverting it to null.
+          break;
+        case "signed-request":
+          this.req.signedRequest = mutation.originalValue;
+          break;
+        default:
+          assertNever(mutation.target);
+      }
+    }
+    this.mutations = [];
+  }
+}

src/proxy/middleware/response/compression.ts

@@ -0,0 +1,36 @@
+import util from "util";
+import zlib from "zlib";
+import { PassThrough } from "stream";
+
+const BUFFER_DECODER_MAP = {
+  gzip: util.promisify(zlib.gunzip),
+  deflate: util.promisify(zlib.inflate),
+  br: util.promisify(zlib.brotliDecompress),
+  text: (data: Buffer) => data,
+};
+
+const STREAM_DECODER_MAP = {
+  gzip: zlib.createGunzip,
+  deflate: zlib.createInflate,
+  br: zlib.createBrotliDecompress,
+  text: () => new PassThrough(),
+};
+
+type SupportedContentEncoding = keyof typeof BUFFER_DECODER_MAP;
+const isSupportedContentEncoding = (
+  encoding: string
+): encoding is SupportedContentEncoding => encoding in BUFFER_DECODER_MAP;
+
+export async function decompressBuffer(buf: Buffer, encoding: string = "text") {
+  if (isSupportedContentEncoding(encoding)) {
+    return (await BUFFER_DECODER_MAP[encoding](buf)).toString();
+  }
+  throw new Error(`Unsupported content-encoding: ${encoding}`);
+}
+
+export function getStreamDecompressor(encoding: string = "text") {
+  if (isSupportedContentEncoding(encoding)) {
+    return STREAM_DECODER_MAP[encoding]();
+  }
+  throw new Error(`Unsupported content-encoding: ${encoding}`);
+}

src/proxy/middleware/response/error-generator.ts

@@ -2,59 +2,77 @@ import express from "express";
 import { APIFormat } from "../../../shared/key-management";
 import { assertNever } from "../../../shared/utils";
 import { initializeSseStream } from "../../../shared/streaming";
+import http from "http";
 
-function getMessageContent({
-  title,
-  message,
-  obj,
-}: {
+/**
+ * Returns a Markdown-formatted message that renders semi-nicely in most chat
+ * frontends. For example:
+ *
+ * **Proxy error (HTTP 404 Not Found)**
+ * The proxy encountered an error while trying to send your prompt to the upstream service. Further technical details are provided below.
+ * ***
+ * *The requested Claude model might not exist, or the key might not be provisioned for it.*
+ * ```
+ * {
+ *  "type": "error",
+ *  "error": {
+ *    "type": "not_found_error",
+ *    "message": "model: some-invalid-model-id",
+ *   },
+ *  "proxy_note": "The requested Claude model might not exist, or the key might not be provisioned for it."
+ * }
+ * ```
+ */
+function getMessageContent(params: {
   title: string;
   message: string;
   obj?: Record<string, any>;
 }) {
-  /*
-  Constructs a Markdown-formatted message that renders semi-nicely in most chat
-  frontends. For example:
-  
-  **Proxy error (HTTP 404 Not Found)**
-  The proxy encountered an error while trying to send your prompt to the upstream service. Further technical details are provided below.
-  ***
-  *The requested Claude model might not exist, or the key might not be provisioned for it.*
-  ```
-  {
-   "type": "error",
-   "error": {
-     "type": "not_found_error",
-     "message": "model: some-invalid-model-id",
-    },
-   "proxy_note": "The requested Claude model might not exist, or the key might not be provisioned for it."
-  }
-  ```
-   */
+  const { title, message, obj } = params;
   const note = obj?.proxy_note || obj?.error?.message || "";
-  const friendlyMessage = note ? `${message}\n\n***\n\n*${note}*` : message;
-  const details = JSON.parse(JSON.stringify(obj ?? {}));
-  let stack = "";
-  if (details.stack) {
-    stack = `\n\nInclude this trace when reporting an issue.\n\`\`\`\n${details.stack}\n\`\`\``;
-    delete details.stack;
+  const header = `### **${title}**`;
+  const friendlyMessage = note ? `${message}\n\n----\n\n*${note}*` : message;
+
+  const serializedObj = obj
+    ? ["```", JSON.stringify(obj, null, 2), "```"].join("\n")
+    : "";
+
+  const { stack } = JSON.parse(JSON.stringify(obj ?? {}));
+  let prettyTrace = "";
+  if (stack && obj) {
+    prettyTrace = [
+      "Include this trace when reporting an issue.",
+      "```",
+      stack,
+      "```",
+    ].join("\n");
+    delete obj.stack;
   }
-  return `\n\n**${title}**\n${friendlyMessage}${
-    obj ? `\n\`\`\`\n${JSON.stringify(obj, null, 2)}\n\`\`\`\n${stack}` : ""
-  }`;
+
+  return [
+    header,
+    friendlyMessage,
+    serializedObj,
+    prettyTrace,
+    "<!-- oai-proxy-error -->",
+  ].join("\n\n");
 }
 
 type ErrorGeneratorOptions = {
   format: APIFormat | "unknown";
   title: string;
   message: string;
-  obj?: object;
+  obj?: Record<string, any>;
   reqId: string | number | object;
   model?: string;
   statusCode?: number;
 };
 
-export function tryInferFormat(body: any): APIFormat | "unknown" {
+/**
+ * Very crude inference of the request format based on the request body. Don't
+ * rely on this to be very accurate.
+ */
+function tryInferFormat(body: any): APIFormat | "unknown" {
   if (typeof body !== "object" || !body.model) {
     return "unknown";
   }
@@ -78,42 +96,82 @@ export function tryInferFormat(body: any): APIFormat | "unknown" {
   return "unknown";
 }
 
-export function sendErrorToClient({
-  options,
-  req,
-  res,
-}: {
+/**
+ * Redacts the hostname from the error message if it contains a DNS resolution
+ * error. This is to avoid leaking upstream hostnames on DNS resolution errors,
+ * as those may contain sensitive information about the proxy's configuration.
+ */
+function redactHostname(options: ErrorGeneratorOptions): ErrorGeneratorOptions {
+  if (!options.message.includes("getaddrinfo")) return options;
+
+  const redacted = { ...options };
+  redacted.message = "Could not resolve hostname";
+
+  if (typeof redacted.obj?.error === "object") {
+    redacted.obj = {
+      ...redacted.obj,
+      error: { message: "Could not resolve hostname" },
+    };
+  }
+
+  return redacted;
+}
+
+/**
+ * Generates an appropriately-formatted error response and sends it to the
+ * client over their requested transport (blocking or SSE stream).
+ */
+export function sendErrorToClient(params: {
   options: ErrorGeneratorOptions;
   req: express.Request;
   res: express.Response;
 }) {
-  const { format: inputFormat } = options;
+  const { req, res } = params;
+  const options = redactHostname(params.options);
+  const { statusCode, message, title, obj: details } = options;
 
-  // This is an error thrown before we know the format of the request, so we
-  // can't send a response in the format the client expects.
+  // Since we want to send the error in a format the client understands, we
+  // need to know the request format. `setApiFormat` might not have been called
+  // yet, so we'll try to infer it from the request body.
   const format =
-    inputFormat === "unknown" ? tryInferFormat(req.body) : inputFormat;
+    options.format === "unknown" ? tryInferFormat(req.body) : options.format;
   if (format === "unknown") {
-    return res.status(options.statusCode || 400).json({
-      error: options.message,
-      details: options.obj,
+    // Early middleware error (auth, rate limit) so we can only send something
+    // generic.
+    const code = statusCode || 400;
+    const hasDetails = details && Object.keys(details).length > 0;
+    return res.status(code).json({
+      error: {
+        message,
+        type: http.STATUS_CODES[code]!.replace(/\s+/g, "_").toLowerCase(),
+      },
+      ...(hasDetails ? { details } : {}),
     });
   }
 
-  const completion = buildSpoofedCompletion({ ...options, format });
-  const event = buildSpoofedSSE({ ...options, format });
-  const isStreaming =
-    req.isStreaming || req.body.stream === true || req.body.stream === "true";
+  // Cannot modify headers if client opted into streaming and made it into the
+  // proxy request queue, because that immediately starts an SSE stream.
+  if (!res.headersSent) {
+    res.setHeader("x-oai-proxy-error", title);
+    res.setHeader("x-oai-proxy-error-status", statusCode || 500);
+  }
 
+  // By this point, we know the request format. To get the error to display in
+  // chat clients' UIs, we'll send it as a 200 response as a spoofed completion
+  // from the language model. Depending on whether the client is streaming, we
+  // will either send an SSE event or a JSON response.
+  const isStreaming = req.isStreaming || String(req.body.stream) === "true";
   if (isStreaming) {
+    // User can have opted into streaming but not made it into the queue yet,
+    // in which case the stream must be started first.
     if (!res.headersSent) {
       initializeSseStream(res);
     }
-    res.write(event);
+    res.write(buildSpoofedSSE({ ...options, format }));
     res.write(`data: [DONE]\n\n`);
     res.end();
   } else {
-    res.status(200).json(completion);
+    res.status(200).json(buildSpoofedCompletion({ ...options, format }));
   }
 }
 
@@ -151,6 +209,11 @@ export function buildSpoofedCompletion({
           },
         ],
       };
+    case "mistral-text":
+      return {
+        outputs: [{ text: content, stop_reason: title }],
+        model,
+      };
     case "openai-text":
       return {
         id: "error-" + id,
@@ -182,13 +245,7 @@ export function buildSpoofedCompletion({
         stop_sequence: null,
       };
     case "google-ai":
-      // TODO: Native Google AI non-streaming responses are not supported, this
-      // is an untested guess at what the response should look like.
       return {
-        id: "error-" + id,
-        object: "chat.completion",
-        created: Date.now(),
-        model,
         candidates: [
           {
             content: { parts: [{ text: content }], role: "model" },
@@ -235,6 +292,11 @@ export function buildSpoofedSSE({
         choices: [{ delta: { content }, index: 0, finish_reason: title }],
       };
       break;
+    case "mistral-text":
+      event = {
+        outputs: [{ text: content, stop_reason: title }],
+      };
+      break;
     case "openai-text":
       event = {
         id: "cmpl-" + id,
@@ -264,7 +326,10 @@ export function buildSpoofedSSE({
       };
       break;
     case "google-ai":
-      return JSON.stringify({
+      // TODO: google ai supports two streaming transports, SSE and JSON.
+      // we currently only support SSE.
+      // return JSON.stringify({
+      event = {
         candidates: [
           {
             content: { parts: [{ text: content }], role: "model" },
@@ -274,7 +339,8 @@ export function buildSpoofedSSE({
             safetyRatings: [],
           },
         ],
-      });
+      };
+      break;
     case "openai-image":
       return JSON.stringify(obj);
     default:

src/proxy/middleware/response/handle-blocking-response.ts

@@ -0,0 +1,70 @@
+import { sendProxyError } from "../common";
+import type { RawResponseBodyHandler } from "./index";
+import { decompressBuffer } from "./compression";
+
+/**
+ * Handles the response from the upstream service and decodes the body if
+ * necessary. If the response is JSON, it will be parsed and returned as an
+ * object. Otherwise, it will be returned as a string. Does not handle streaming
+ * responses.
+ * @throws {Error} Unsupported content-encoding or invalid application/json body
+ */
+export const handleBlockingResponse: RawResponseBodyHandler = async (
+  proxyRes,
+  req,
+  res
+) => {
+  if (req.isStreaming) {
+    const err = new Error(
+      "handleBlockingResponse called for a streaming request."
+    );
+    req.log.error({ stack: err.stack, api: req.inboundApi }, err.message);
+    throw err;
+  }
+
+  return new Promise((resolve, reject) => {
+    let chunks: Buffer[] = [];
+    proxyRes.on("data", (chunk) => chunks.push(chunk));
+    proxyRes.on("end", async () => {
+      const contentEncoding = proxyRes.headers["content-encoding"];
+      const contentType = proxyRes.headers["content-type"];
+      let body: string | Buffer = Buffer.concat(chunks);
+      const rejectWithMessage = function (msg: string, err: Error) {
+        const error = `${msg} (${err.message})`;
+        req.log.warn(
+          { msg: error, stack: err.stack },
+          "Error in blocking response handler"
+        );
+        sendProxyError(req, res, 500, "Internal Server Error", { error });
+        return reject(error);
+      };
+
+      try {
+        body = await decompressBuffer(body, contentEncoding);
+      } catch (e) {
+        return rejectWithMessage(`Could not decode response body`, e);
+      }
+
+      try {
+        return resolve(tryParseAsJson(body, contentType));
+      } catch (e) {
+        return rejectWithMessage("API responded with invalid JSON", e);
+      }
+    });
+  });
+};
+
+function tryParseAsJson(body: string, contentType?: string) {
+  // If the response is declared as JSON, it must parse or we will throw
+  if (contentType?.includes("application/json")) {
+    return JSON.parse(body);
+  }
+  // If it's not declared as JSON, some APIs we'll try to parse it as JSON
+  // anyway since some APIs return the wrong content-type header in some cases.
+  // If it fails to parse, we'll just return the raw body without throwing.
+  try {
+    return JSON.parse(body);
+  } catch (e) {
+    return body;
+  }
+}

src/proxy/middleware/response/handle-streamed-response.ts

@@ -1,59 +1,61 @@
 import express from "express";
 import { pipeline, Readable, Transform } from "stream";
-import StreamArray from "stream-json/streamers/StreamArray";
 import { StringDecoder } from "string_decoder";
 import { promisify } from "util";
+import type { logger } from "../../../logger";
+import { BadRequestError, RetryableError } from "../../../shared/errors";
 import { APIFormat, keyPool } from "../../../shared/key-management";
 import {
   copySseResponseHeaders,
   initializeSseStream,
 } from "../../../shared/streaming";
-import type { logger } from "../../../logger";
-import { enqueue } from "../../queue";
-import { decodeResponseBody, RawResponseBodyHandler, RetryableError } from ".";
+import { reenqueueRequest } from "../../queue";
+import type { RawResponseBodyHandler } from ".";
+import { handleBlockingResponse } from "./handle-blocking-response";
+import { buildSpoofedSSE, sendErrorToClient } from "./error-generator";
 import { getAwsEventStreamDecoder } from "./streaming/aws-event-stream-decoder";
 import { EventAggregator } from "./streaming/event-aggregator";
 import { SSEMessageTransformer } from "./streaming/sse-message-transformer";
 import { SSEStreamAdapter } from "./streaming/sse-stream-adapter";
-import { buildSpoofedSSE, sendErrorToClient } from "./error-generator";
-import { BadRequestError } from "../../../shared/errors";
+import { getStreamDecompressor } from "./compression";
 
 const pipelineAsync = promisify(pipeline);
 
 /**
- * `handleStreamedResponse` consumes and transforms a streamed response from the
- * upstream service, forwarding events to the client in their requested format.
+ * `handleStreamedResponse` consumes a streamed response from the upstream API,
+ * decodes chunk-by-chunk into a stream of events, transforms those events into
+ * the client's requested format, and forwards the result to the client.
+ *
  * After the entire stream has been consumed, it resolves with the full response
  * body so that subsequent middleware in the chain can process it as if it were
- * a non-streaming response.
+ * a non-streaming response (to count output tokens, track usage, etc).
  *
- * In the event of an error, the request's streaming flag is unset and the non-
- * streaming response handler is called instead.
- *
- * If the error is retryable, that handler will re-enqueue the request and also
- * reset the streaming flag. Unfortunately the streaming flag is set and unset
- * in multiple places, so it's hard to keep track of.
+ * In the event of an error, the request's streaming flag is unset and the
+ * request is bounced back to the non-streaming response handler. If the error
+ * is retryable, that handler will re-enqueue the request and also reset the
+ * streaming flag. Unfortunately the streaming flag is set and unset in multiple
+ * places, so it's hard to keep track of.
  */
 export const handleStreamedResponse: RawResponseBodyHandler = async (
   proxyRes,
   req,
   res
 ) => {
-  const { hash } = req.key!;
+  const { headers, statusCode } = proxyRes;
   if (!req.isStreaming) {
     throw new Error("handleStreamedResponse called for non-streaming request.");
   }
 
-  if (proxyRes.statusCode! > 201) {
+  if (statusCode! > 201) {
     req.isStreaming = false;
     req.log.warn(
-      { statusCode: proxyRes.statusCode, key: hash },
+      { statusCode },
       `Streaming request returned error status code. Falling back to non-streaming response handler.`
     );
-    return decodeResponseBody(proxyRes, req, res);
+    return handleBlockingResponse(proxyRes, req, res);
   }
 
-  req.log.debug({ headers: proxyRes.headers }, `Starting to proxy SSE stream.`);
+  req.log.debug({ headers }, `Starting to proxy SSE stream.`);
 
   // Typically, streaming will have already been initialized by the request
   // queue to send heartbeat pings.
@@ -64,18 +66,25 @@ export const handleStreamedResponse: RawResponseBodyHandler = async (
 
   const prefersNativeEvents = req.inboundApi === req.outboundApi;
   const streamOptions = {
-    contentType: proxyRes.headers["content-type"],
+    contentType: headers["content-type"],
     api: req.outboundApi,
     logger: req.log,
   };
 
-  // Decoder turns the raw response stream into a stream of events in some
-  // format (text/event-stream, vnd.amazon.event-stream, streaming JSON, etc).
+  // While the request is streaming, aggregator collects all events so that we
+  // can compile them into a single response object and publish that to the
+  // remaining middleware. Because we have an OpenAI transformer for every
+  // supported format, EventAggregator always consumes OpenAI events so that we
+  // only have to write one aggregator (OpenAI input) for each output format.
+  const aggregator = new EventAggregator(req);
+
+  const decompressor = getStreamDecompressor(headers["content-encoding"]);
+  // Decoder reads from the response bytes to produce a stream of plaintext.
   const decoder = getDecoder({ ...streamOptions, input: proxyRes });
-  // Adapter transforms the decoded events into server-sent events.
+  // Adapter consumes the decoded text and produces server-sent events so we
+  // have a standard event format for the client and to translate between API
+  // message formats.
   const adapter = new SSEStreamAdapter(streamOptions);
-  // Aggregator compiles all events into a single response object.
-  const aggregator = new EventAggregator({ format: req.outboundApi });
   // Transformer converts server-sent events from one vendor's API message
   // format to another.
   const transformer = new SSEMessageTransformer({
@@ -97,7 +106,7 @@ export const handleStreamedResponse: RawResponseBodyHandler = async (
   try {
     await Promise.race([
       handleAbortedStream(req, res),
-      pipelineAsync(proxyRes, decoder, adapter, transformer),
+      pipelineAsync(proxyRes, decompressor, decoder, adapter, transformer),
     ]);
     req.log.debug(`Finished proxying SSE stream.`);
     res.end();
@@ -105,12 +114,7 @@ export const handleStreamedResponse: RawResponseBodyHandler = async (
   } catch (err) {
     if (err instanceof RetryableError) {
       keyPool.markRateLimited(req.key!);
-      req.log.warn(
-        { key: req.key!.hash, retryCount: req.retryCount },
-        `Re-enqueueing request due to retryable error during streaming response.`
-      );
-      req.retryCount++;
-      await enqueue(req);
+      await reenqueueRequest(req);
     } else if (err instanceof BadRequestError) {
       sendErrorToClient({
         req,
@@ -138,7 +142,17 @@ export const handleStreamedResponse: RawResponseBodyHandler = async (
       res.write(`data: [DONE]\n\n`);
       res.end();
     }
-    throw err;
+
+    // At this point the response is closed. If the request resulted in any
+    // tokens being consumed (suggesting a mid-stream error), we will resolve
+    // and continue the middleware chain so tokens can be counted.
+    if (aggregator.hasEvents()) {
+      return aggregator.getFinalResponse();
+    } else {
+      // If there is nothing, then this was a completely failed prompt that
+      // will not have billed any tokens. Throw to stop the middleware chain.
+      throw err;
+    }
   }
 };
 
@@ -159,14 +173,13 @@ function getDecoder(options: {
   logger: typeof logger;
   contentType?: string;
 }) {
-  const { api, contentType, input, logger } = options;
+  const { contentType, input, logger } = options;
   if (contentType?.includes("application/vnd.amazon.eventstream")) {
     return getAwsEventStreamDecoder({ input, logger });
-  } else if (api === "google-ai") {
-    return StreamArray.withParser();
+  } else if (contentType?.includes("application/json")) {
+    throw new Error("JSON streaming not supported, request SSE instead");
   } else {
-    // Passthrough stream, but ensures split chunks across multi-byte characters
-    // are handled correctly.
+    // Ensures split chunks across multi-byte characters are handled correctly.
     const stringDecoder = new StringDecoder("utf8");
     return new Transform({
       readableObjectMode: true,

src/proxy/middleware/response/index.ts

@@ -1,10 +1,9 @@
 /* This file is fucking horrendous, sorry */
+// TODO: extract all per-service error response handling into its own modules
 import { Request, Response } from "express";
 import * as http from "http";
-import util from "util";
-import zlib from "zlib";
-import { enqueue, trackWaitTime } from "../../queue";
-import { HttpError } from "../../../shared/errors";
+import { config } from "../../../config";
+import { HttpError, RetryableError } from "../../../shared/errors";
 import { keyPool } from "../../../shared/key-management";
 import { getOpenAIModelFamily } from "../../../shared/models";
 import { countTokens } from "../../../shared/tokenization";
@@ -13,6 +12,7 @@ import {
   incrementTokenCount,
 } from "../../../shared/users/user-store";
 import { assertNever } from "../../../shared/utils";
+import { reenqueueRequest, trackWaitTime } from "../../queue";
 import { refundLastAttempt } from "../../rate-limit";
 import {
   getCompletionFromBody,
@@ -20,39 +20,23 @@ import {
   isTextGenerationRequest,
   sendProxyError,
 } from "../common";
+import { handleBlockingResponse } from "./handle-blocking-response";
 import { handleStreamedResponse } from "./handle-streamed-response";
 import { logPrompt } from "./log-prompt";
+import { logEvent } from "./log-event";
 import { saveImage } from "./save-image";
-import { config } from "../../../config";
-
-const DECODER_MAP = {
-  gzip: util.promisify(zlib.gunzip),
-  deflate: util.promisify(zlib.inflate),
-  br: util.promisify(zlib.brotliDecompress),
-};
-
-const isSupportedContentEncoding = (
-  contentEncoding: string
-): contentEncoding is keyof typeof DECODER_MAP => {
-  return contentEncoding in DECODER_MAP;
-};
-
-export class RetryableError extends Error {
-  constructor(message: string) {
-    super(message);
-    this.name = "RetryableError";
-  }
-}
 
 /**
- * Either decodes or streams the entire response body and then passes it as the
- * last argument to the rest of the middleware stack.
+ * Either decodes or streams the entire response body and then resolves with it.
+ * @returns The response body as a string or parsed JSON object depending on the
+ * response's content-type.
  */
 export type RawResponseBodyHandler = (
   proxyRes: http.IncomingMessage,
   req: Request,
   res: Response
 ) => Promise<string | Record<string, any>>;
+
 export type ProxyResHandlerWithBody = (
   proxyRes: http.IncomingMessage,
   req: Request,
@@ -63,7 +47,7 @@ export type ProxyResHandlerWithBody = (
    */
   body: string | Record<string, any>
 ) => Promise<void>;
-export type ProxyResMiddleware = ProxyResHandlerWithBody[];
+export type ProxyResMiddleware = ProxyResHandlerWithBody[] | undefined;
 
 /**
  * Returns a on.proxyRes handler that executes the given middleware stack after
@@ -76,6 +60,10 @@ export type ProxyResMiddleware = ProxyResHandlerWithBody[];
  * middleware from executing as it consumes the stream and forwards events to
  * the client. Once the stream is closed, the finalized body will be attached
  * to res.body and the remaining middleware will execute.
+ *
+ * @param apiMiddleware - Custom middleware to execute after the common response
+ * handlers. These *only* execute for non-streaming responses, so should be used
+ * to transform non-streaming responses into the desired format.
  */
 export const createOnProxyResHandler = (apiMiddleware: ProxyResMiddleware) => {
   return async (
@@ -83,37 +71,47 @@ export const createOnProxyResHandler = (apiMiddleware: ProxyResMiddleware) => {
     req: Request,
     res: Response
   ) => {
+    // Proxied request has by now been sent to the upstream API, so we revert
+    // tracked mutations that were only needed to send the request.
+    // This generally means path adjustment, headers, and body serialization.
+    if (req.changeManager) {
+      req.changeManager.revert();
+    }
+
     const initialHandler = req.isStreaming
       ? handleStreamedResponse
-      : decodeResponseBody;
-
+      : handleBlockingResponse;
     let lastMiddleware = initialHandler.name;
 
+    if (Buffer.isBuffer(req.body)) {
+      req.body = JSON.parse(req.body.toString());
+    }
+
     try {
       const body = await initialHandler(proxyRes, req, res);
-
       const middlewareStack: ProxyResMiddleware = [];
 
       if (req.isStreaming) {
-        // `handleStreamedResponse` writes to the response and ends it, so
-        // we can only execute middleware that doesn't write to the response.
+        // Handlers for streaming requests must never write to the response.
         middlewareStack.push(
-          trackRateLimit,
+          trackKeyRateLimit,
           countResponseTokens,
           incrementUsage,
-          logPrompt
+          logPrompt,
+          logEvent
         );
       } else {
         middlewareStack.push(
-          trackRateLimit,
-          addProxyInfo,
+          trackKeyRateLimit,
+          injectProxyInfo,
           handleUpstreamErrors,
           countResponseTokens,
           incrementUsage,
           copyHttpHeaders,
           saveImage,
           logPrompt,
-          ...apiMiddleware
+          logEvent,
+          ...(apiMiddleware ?? [])
         );
       }
 
@@ -137,15 +135,15 @@ export const createOnProxyResHandler = (apiMiddleware: ProxyResMiddleware) => {
       }
 
       const { stack, message } = error;
-      const info = { stack, lastMiddleware, key: req.key?.hash };
+      const details = { stack, message, lastMiddleware, key: req.key?.hash };
       const description = `Error while executing proxy response middleware: ${lastMiddleware} (${message})`;
 
       if (res.headersSent) {
-        req.log.error(info, description);
+        req.log.error(details, description);
         if (!res.writableEnded) res.end();
         return;
       } else {
-        req.log.error(info, description);
+        req.log.error(details, description);
         res
           .status(500)
           .json({ error: "Internal server error", proxy_note: description });
@@ -154,72 +152,6 @@ export const createOnProxyResHandler = (apiMiddleware: ProxyResMiddleware) => {
   };
 };
 
-async function reenqueueRequest(req: Request) {
-  req.log.info(
-    { key: req.key?.hash, retryCount: req.retryCount },
-    `Re-enqueueing request due to retryable error`
-  );
-  req.retryCount++;
-  await enqueue(req);
-}
-
-/**
- * Handles the response from the upstream service and decodes the body if
- * necessary.  If the response is JSON, it will be parsed and returned as an
- * object.  Otherwise, it will be returned as a string.
- * @throws {Error} Unsupported content-encoding or invalid application/json body
- */
-export const decodeResponseBody: RawResponseBodyHandler = async (
-  proxyRes,
-  req,
-  res
-) => {
-  if (req.isStreaming) {
-    const err = new Error("decodeResponseBody called for a streaming request.");
-    req.log.error({ stack: err.stack, api: req.inboundApi }, err.message);
-    throw err;
-  }
-
-  return new Promise<string>((resolve, reject) => {
-    let chunks: Buffer[] = [];
-    proxyRes.on("data", (chunk) => chunks.push(chunk));
-    proxyRes.on("end", async () => {
-      let body = Buffer.concat(chunks);
-
-      const contentEncoding = proxyRes.headers["content-encoding"];
-      if (contentEncoding) {
-        if (isSupportedContentEncoding(contentEncoding)) {
-          const decoder = DECODER_MAP[contentEncoding];
-          // @ts-ignore - started failing after upgrading TypeScript, don't care
-          // as it was never a problem.
-          body = await decoder(body);
-        } else {
-          const error = `Proxy received response with unsupported content-encoding: ${contentEncoding}`;
-          req.log.warn({ contentEncoding, key: req.key?.hash }, error);
-          sendProxyError(req, res, 500, "Internal Server Error", {
-            error,
-            contentEncoding,
-          });
-          return reject(error);
-        }
-      }
-
-      try {
-        if (proxyRes.headers["content-type"]?.includes("application/json")) {
-          const json = JSON.parse(body.toString());
-          return resolve(json);
-        }
-        return resolve(body.toString());
-      } catch (e) {
-        const msg = `Proxy received response with invalid JSON: ${e.message}`;
-        req.log.warn({ error: e.stack, key: req.key?.hash }, msg);
-        sendProxyError(req, res, 500, "Internal Server Error", { error: msg });
-        return reject(msg);
-      }
-    });
-  });
-};
-
 type ProxiedErrorPayload = {
   error?: Record<string, any>;
   message?: string;
@@ -242,58 +174,64 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
 ) => {
   const statusCode = proxyRes.statusCode || 500;
   const statusMessage = proxyRes.statusMessage || "Internal Server Error";
+  const service = req.key!.service;
+  // Not an error, continue to next response handler
+  if (statusCode < 400) return;
 
-  if (statusCode < 400) {
-    return;
-  }
-
+  // Parse the error response body
   let errorPayload: ProxiedErrorPayload;
-  const tryAgainMessage = keyPool.available(req.body?.model)
-    ? `There may be more keys available for this model; try again in a few seconds.`
-    : "There are no more keys available for this model.";
-
   try {
     assertJsonResponse(body);
     errorPayload = body;
   } catch (parseError) {
-    // Likely Bad Gateway or Gateway Timeout from upstream's reverse proxy
-    const hash = req.key?.hash;
-    req.log.warn({ statusCode, statusMessage, key: hash }, parseError.message);
+    const strBody = String(body).slice(0, 128);
+    req.log.error({ statusCode, strBody }, "Error body is not JSON");
 
-    const errorObject = {
+    const details = {
       error: parseError.message,
       status: statusCode,
       statusMessage,
-      proxy_note: `Proxy got back an error, but it was not in JSON format. This is likely a temporary problem with the upstream service.`,
+      proxy_note: `Proxy got back an error, but it was not in JSON format. This is likely a temporary problem with the upstream service. Response body: ${strBody}`,
     };
 
-    sendProxyError(req, res, statusCode, statusMessage, errorObject);
+    sendProxyError(req, res, statusCode, statusMessage, details);
     throw new HttpError(statusCode, parseError.message);
   }
 
+  // Extract the error type from the response body depending on the service
+  if (service === "gcp") {
+    if (Array.isArray(errorPayload)) {
+      errorPayload = errorPayload[0];
+    }
+  }
   const errorType =
     errorPayload.error?.code ||
     errorPayload.error?.type ||
     getAwsErrorType(proxyRes.headers["x-amzn-errortype"]);
 
   req.log.warn(
-    { statusCode, type: errorType, errorPayload, key: req.key?.hash },
-    `Received error response from upstream. (${proxyRes.statusMessage})`
+    { statusCode, statusMessage, errorType, errorPayload, key: req.key?.hash },
+    `API returned an error.`
   );
 
-  const service = req.key!.service;
+  // Try to convert response body to a ProxiedErrorPayload with message/type
   if (service === "aws") {
-    // Try to standardize the error format for AWS
     errorPayload.error = { message: errorPayload.message, type: errorType };
     delete errorPayload.message;
+  } else if (service === "gcp") {
+    if (errorPayload.error?.code) {
+      errorPayload.error = {
+        message: errorPayload.error.message,
+        type: errorPayload.error.status || errorPayload.error.code,
+      };
+    }
   }
 
+  // Figure out what to do with the error
+  // TODO: separate error handling for each service
   if (statusCode === 400) {
-    // Bad request. For OpenAI, this is usually due to prompt length.
-    // For Anthropic, this is usually due to missing preamble.
     switch (service) {
       case "openai":
-      case "google-ai":
       case "mistral-ai":
       case "azure":
         const filteredCodes = ["content_policy_violation", "content_filter"];
@@ -303,14 +241,18 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
         } else if (errorPayload.error?.code === "billing_hard_limit_reached") {
           // For some reason, some models return this 400 error instead of the
           // same 429 billing error that other models return.
-          await handleOpenAIRateLimitError(req, tryAgainMessage, errorPayload);
+          await handleOpenAIRateLimitError(req, errorPayload);
         } else {
-          errorPayload.proxy_note = `The upstream API rejected the request. Your prompt may be too long for ${req.body?.model}.`;
+          errorPayload.proxy_note = `The upstream API rejected the request. Check the error message for details.`;
         }
         break;
       case "anthropic":
       case "aws":
-        await handleAnthropicBadRequestError(req, errorPayload);
+      case "gcp":
+        await handleAnthropicAwsBadRequestError(req, errorPayload);
+        break;
+      case "google-ai":
+        await handleGoogleAIBadRequestError(req, errorPayload);
         break;
       default:
         assertNever(service);
@@ -318,38 +260,57 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
   } else if (statusCode === 401) {
     // Key is invalid or was revoked
     keyPool.disable(req.key!, "revoked");
-    errorPayload.proxy_note = `API key is invalid or revoked. ${tryAgainMessage}`;
+    errorPayload.proxy_note = `Assigned API key is invalid or revoked, please try again.`;
   } else if (statusCode === 403) {
-    if (service === "anthropic") {
-      keyPool.disable(req.key!, "revoked");
-      errorPayload.proxy_note = `API key is invalid or revoked. ${tryAgainMessage}`;
-      return;
-    }
-    switch (errorType) {
-      case "UnrecognizedClientException":
-        // Key is invalid.
-        keyPool.disable(req.key!, "revoked");
-        errorPayload.proxy_note = `API key is invalid or revoked. ${tryAgainMessage}`;
-        break;
-      case "AccessDeniedException":
-        const isModelAccessError =
-          errorPayload.error?.message?.includes(`specified model ID`);
-        if (!isModelAccessError) {
-          req.log.error(
-            { key: req.key?.hash, model: req.body?.model },
-            "Disabling key due to AccessDeniedException when invoking model. If credentials are valid, check IAM permissions."
+    switch (service) {
+      case "anthropic":
+        if (
+          errorType === "permission_error" &&
+          errorPayload.error?.message?.toLowerCase().includes("multimodal")
+        ) {
+          keyPool.update(req.key!, { allowsMultimodality: false });
+          await reenqueueRequest(req);
+          throw new RetryableError(
+            "Claude request re-enqueued because key does not support multimodality."
           );
+        } else {
           keyPool.disable(req.key!, "revoked");
+          errorPayload.proxy_note = `Assigned API key is invalid or revoked, please try again.`;
         }
-        errorPayload.proxy_note = `API key doesn't have access to the requested resource. Model ID: ${req.body?.model}`;
-        break;
-      default:
-        errorPayload.proxy_note = `Received 403 error. Key may be invalid.`;
+        return;
+      case "aws":
+        switch (errorType) {
+          case "UnrecognizedClientException":
+            // Key is invalid.
+            keyPool.disable(req.key!, "revoked");
+            errorPayload.proxy_note = `Assigned API key is invalid or revoked, please try again.`;
+            break;
+          case "AccessDeniedException":
+            const isModelAccessError =
+              errorPayload.error?.message?.includes(`specified model ID`);
+            if (!isModelAccessError) {
+              req.log.error(
+                { key: req.key?.hash, model: req.body?.model },
+                "Disabling key due to AccessDeniedException when invoking model. If credentials are valid, check IAM permissions."
+              );
+              keyPool.disable(req.key!, "revoked");
+            }
+            errorPayload.proxy_note = `API key doesn't have access to the requested resource. Model ID: ${req.body?.model}`;
+            break;
+          default:
+            errorPayload.proxy_note = `Received 403 error. Key may be invalid.`;
+        }
+        return;
+      case "mistral-ai":
+      case "gcp":
+        keyPool.disable(req.key!, "revoked");
+        errorPayload.proxy_note = `Assigned API key is invalid or revoked, please try again.`;
+        return;
     }
   } else if (statusCode === 429) {
     switch (service) {
       case "openai":
-        await handleOpenAIRateLimitError(req, tryAgainMessage, errorPayload);
+        await handleOpenAIRateLimitError(req, errorPayload);
         break;
       case "anthropic":
         await handleAnthropicRateLimitError(req, errorPayload);
@@ -357,6 +318,9 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
       case "aws":
         await handleAwsRateLimitError(req, errorPayload);
         break;
+      case "gcp":
+        await handleGcpRateLimitError(req, errorPayload);
+        break;
       case "azure":
       case "mistral-ai":
         await handleAzureRateLimitError(req, errorPayload);
@@ -371,7 +335,7 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
     // Most likely model not found
     switch (service) {
       case "openai":
-        if (errorPayload.error?.code === "model_not_found") {
+        if (errorType === "model_not_found") {
           const requestedModel = req.body.model;
           const modelFamily = getOpenAIModelFamily(requestedModel);
           errorPayload.proxy_note = `The key assigned to your prompt does not support the requested model (${requestedModel}, family: ${modelFamily}).`;
@@ -382,28 +346,35 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
         }
         break;
       case "anthropic":
-        errorPayload.proxy_note = `The requested Claude model might not exist, or the key might not be provisioned for it.`;
-        break;
       case "google-ai":
-        errorPayload.proxy_note = `The requested Google AI model might not exist, or the key might not be provisioned for it.`;
-        break;
       case "mistral-ai":
-        errorPayload.proxy_note = `The requested Mistral AI model might not exist, or the key might not be provisioned for it.`;
-        break;
       case "aws":
-        errorPayload.proxy_note = `The requested AWS resource might not exist, or the key might not have access to it.`;
-        break;
+      case "gcp":
       case "azure":
-        errorPayload.proxy_note = `The assigned Azure deployment does not support the requested model.`;
+        errorPayload.proxy_note = `The key assigned to your prompt does not support the requested model.`;
         break;
       default:
         assertNever(service);
     }
+  } else if (statusCode === 503) {
+    switch (service) {
+      case "aws":
+        if (
+          errorType === "ServiceUnavailableException" &&
+          errorPayload.error?.message?.match(/too many connections/i)
+        ) {
+          errorPayload.proxy_note = `The requested AWS Bedrock model is overloaded. Try again in a few minutes, or try another model.`;
+        }
+        break;
+      default:
+        errorPayload.proxy_note = `Upstream service unavailable. Try again later.`;
+        break;
+    }
   } else {
     errorPayload.proxy_note = `Unrecognized error from upstream service.`;
   }
 
-  // Some OAI errors contain the organization ID, which we don't want to reveal.
+  // Redact the OpenAI org id from the error message
   if (errorPayload.error?.message) {
     errorPayload.error.message = errorPayload.error.message.replace(
       /org-.{24}/gm,
@@ -411,13 +382,14 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
     );
   }
 
+  // Send the error to the client
   sendProxyError(req, res, statusCode, statusMessage, errorPayload);
-  // This is bubbled up to onProxyRes's handler for logging but will not trigger
-  // a write to the response as `sendProxyError` has just done that.
+
+  // Re-throw the error to bubble up to onProxyRes's handler for logging
   throw new HttpError(statusCode, errorPayload.error?.message);
 };
 
-async function handleAnthropicBadRequestError(
+async function handleAnthropicAwsBadRequestError(
   req: Request,
   errorPayload: ProxiedErrorPayload
 ) {
@@ -452,14 +424,16 @@ async function handleAnthropicBadRequestError(
     return;
   }
 
-  const isDisabled = error?.message?.match(/organization has been disabled/i);
+  const isDisabled =
+    error?.message?.match(/organization has been disabled/i) ||
+    error?.message?.match(/^operation not allowed/i);
   if (isDisabled) {
     req.log.warn(
       { key: req.key?.hash, message: error?.message },
-      "Anthropic key has been disabled."
+      "Anthropic/AWS key has been disabled."
     );
     keyPool.disable(req.key!, "revoked");
-    errorPayload.proxy_note = `Assigned key has been disabled. ${error?.message}`;
+    errorPayload.proxy_note = `Assigned key has been disabled. (${error?.message})`;
     return;
   }
 
@@ -497,9 +471,21 @@ async function handleAwsRateLimitError(
   }
 }
 
+async function handleGcpRateLimitError(
+  req: Request,
+  errorPayload: ProxiedErrorPayload
+) {
+  if (errorPayload.error?.type === "RESOURCE_EXHAUSTED") {
+    keyPool.markRateLimited(req.key!);
+    await reenqueueRequest(req);
+    throw new RetryableError("GCP rate-limited request re-enqueued.");
+  } else {
+    errorPayload.proxy_note = `Unrecognized 429 Too Many Requests error from GCP.`;
+  }
+}
+
 async function handleOpenAIRateLimitError(
   req: Request,
-  tryAgainMessage: string,
   errorPayload: ProxiedErrorPayload
 ): Promise<Record<string, any>> {
   const type = errorPayload.error?.type;
@@ -508,17 +494,17 @@ async function handleOpenAIRateLimitError(
     case "invalid_request_error": // this is the billing_hard_limit_reached error seen in some cases
       // Billing quota exceeded (key is dead, disable it)
       keyPool.disable(req.key!, "quota");
-      errorPayload.proxy_note = `Assigned key's quota has been exceeded. ${tryAgainMessage}`;
+      errorPayload.proxy_note = `Assigned key's quota has been exceeded. Please try again.`;
       break;
     case "access_terminated":
       // Account banned (key is dead, disable it)
       keyPool.disable(req.key!, "revoked");
-      errorPayload.proxy_note = `Assigned key has been banned by OpenAI for policy violations. ${tryAgainMessage}`;
+      errorPayload.proxy_note = `Assigned key has been banned by OpenAI for policy violations. Please try again.`;
       break;
     case "billing_not_active":
       // Key valid but account billing is delinquent
       keyPool.disable(req.key!, "quota");
-      errorPayload.proxy_note = `Assigned key has been disabled due to delinquent billing. ${tryAgainMessage}`;
+      errorPayload.proxy_note = `Assigned key has been disabled due to delinquent billing. Please try again.`;
       break;
     case "requests":
     case "tokens":
@@ -532,58 +518,8 @@ async function handleOpenAIRateLimitError(
       // Per-minute request or token rate limit is exceeded, which we can retry
       await reenqueueRequest(req);
       throw new RetryableError("Rate-limited request re-enqueued.");
-    // WIP/nonfunctional
-    // case "tokens_usage_based":
-    //   // Weird new rate limit type that seems limited to preview models.
-    //   // Distinct from `tokens` type. Can be per-minute or per-day.
-    //
-    //   // I've seen reports of this error for 500k tokens/day and 10k tokens/min.
-    //   // 10k tokens per minute is problematic, because this is much less than
-    //   // GPT4-Turbo's max context size for a single prompt and is effectively a
-    //   // cap on the max context size for just that key+model, which the app is
-    //   // not able to deal with.
-    //
-    //   // Similarly if there is a 500k tokens per day limit and 450k tokens have
-    //   // been used today, the max context for that key becomes 50k tokens until
-    //   // the next day and becomes progressively smaller as more tokens are used.
-    //
-    //   // To work around these keys we will first retry the request a few times.
-    //   // After that we will reject the request, and if it's a per-day limit we
-    //   // will also disable the key.
-    //
-    //   // "Rate limit reached for gpt-4-1106-preview in organization org-xxxxxxxxxxxxxxxxxxx on tokens_usage_based per day: Limit 500000, Used 460000, Requested 50000"
-    //   // "Rate limit reached for gpt-4-1106-preview in organization org-xxxxxxxxxxxxxxxxxxx on tokens_usage_based per min: Limit 10000, Requested 40000"
-    //
-    //   const regex =
-    //     /Rate limit reached for .+ in organization .+ on \w+ per (day|min): Limit (\d+)(?:, Used (\d+))?, Requested (\d+)/;
-    //   const [, period, limit, used, requested] =
-    //     errorPayload.error?.message?.match(regex) || [];
-    //
-    //   req.log.warn(
-    //     { key: req.key?.hash, period, limit, used, requested },
-    //     "Received `tokens_usage_based` rate limit error from OpenAI."
-    //   );
-    //
-    //   if (!period || !limit || !requested) {
-    //     errorPayload.proxy_note = `Unrecognized rate limit error from OpenAI. (${errorPayload.error?.message})`;
-    //     break;
-    //   }
-    //
-    //   if (req.retryCount < 2) {
-    //     await reenqueueRequest(req);
-    //     throw new RetryableError("Rate-limited request re-enqueued.");
-    //   }
-    //
-    //   if (period === "min") {
-    //     errorPayload.proxy_note = `Assigned key can't be used for prompts longer than ${limit} tokens, and no other keys are available right now. Reduce the length of your prompt or try again in a few minutes.`;
-    //   } else {
-    //     errorPayload.proxy_note = `Assigned key  has reached its per-day request limit for this model. Try another model.`;
-    //   }
-    //
-    //   keyPool.markRateLimited(req.key!);
-    //   break;
     default:
-      errorPayload.proxy_note = `This is likely a temporary error with OpenAI. Try again in a few seconds.`;
+      errorPayload.proxy_note = `This is likely a temporary error with the API. Try again in a few seconds.`;
       break;
   }
   return errorPayload;
@@ -605,17 +541,98 @@ async function handleAzureRateLimitError(
   }
 }
 
+//{"error":{"code":400,"message":"API Key not found. Please pass a valid API key.","status":"INVALID_ARGUMENT","details":[{"@type":"type.googleapis.com/google.rpc.ErrorInfo","reason":"API_KEY_INVALID","domain":"googleapis.com","metadata":{"service":"generativelanguage.googleapis.com"}}]}}
+//{"error":{"code":400,"message":"Gemini API free tier is not available in your country. Please enable billing on your project in Google AI Studio.","status":"FAILED_PRECONDITION"}}
+async function handleGoogleAIBadRequestError(
+  req: Request,
+  errorPayload: ProxiedErrorPayload
+) {
+  const error = errorPayload.error || {};
+  // google changes this shit every few months
+  // i don't want to deal with it
+  const keyDeadMsgs = [
+    /please enable billing/i,
+    /API key not valid/i,
+    /API key expired/i,
+    /pass a valid API/i,
+  ];
+  const text = JSON.stringify(error);
+  if (keyDeadMsgs.some((msg) => text.match(msg))) {
+    req.log.warn(
+      { key: req.key?.hash, error: text },
+      "Google API key appears to be inoperative."
+    );
+    keyPool.disable(req.key!, "revoked");
+    errorPayload.proxy_note = `Assigned API key cannot be used.`;
+  } else {
+    req.log.warn(
+      { key: req.key?.hash, error: text },
+      "Unknown Google API error."
+    );
+    errorPayload.proxy_note = `Unrecognized error from Google AI.`;
+  }
+
+  // const { message, status, details } = error;
+  //
+  // if (status === "INVALID_ARGUMENT") {
+  //   const reason = details?.[0]?.reason;
+  //   if (reason === "API_KEY_INVALID") {
+  //     req.log.warn(
+  //       { key: req.key?.hash, status, reason, msg: error.message },
+  //       "Received `API_KEY_INVALID` error from Google AI. Check the configured API key."
+  //     );
+  //     keyPool.disable(req.key!, "revoked");
+  //     errorPayload.proxy_note = `Assigned API key is invalid.`;
+  //   }
+  // } else if (status === "FAILED_PRECONDITION") {
+  //   if (message.match(/please enable billing/i)) {
+  //     req.log.warn(
+  //       { key: req.key?.hash, status, msg: error.message },
+  //       "Cannot use key due to billing restrictions."
+  //     );
+  //     keyPool.disable(req.key!, "revoked");
+  //     errorPayload.proxy_note = `Assigned API key cannot be used.`;
+  //   }
+  // } else {
+  //   req.log.warn(
+  //     { key: req.key?.hash, status, msg: error.message },
+  //     "Received unexpected 400 error from Google AI."
+  //   );
+  // }
+}
+
 //{"error":{"code":429,"message":"Resource has been exhausted (e.g. check quota).","status":"RESOURCE_EXHAUSTED"}
+//
 async function handleGoogleAIRateLimitError(
   req: Request,
   errorPayload: ProxiedErrorPayload
 ) {
   const status = errorPayload.error?.status;
+  const text = JSON.stringify(errorPayload.error);
+
+  // sometimes they block keys by rate limiting them to 0 requests per minute
+  // for some indefinite period of time
+  const keyDeadMsgs = [
+    /GenerateContentRequestsPerMinutePerProjectPerRegion/i,
+    /"quota_limit_value":"0"/i,
+  ];
+
   switch (status) {
-    case "RESOURCE_EXHAUSTED":
+    case "RESOURCE_EXHAUSTED": {
+      if (keyDeadMsgs.every((msg) => text.match(msg))) {
+        req.log.warn(
+          { key: req.key?.hash, error: text },
+          "Google API key appears to be temporarily inoperative and will be disabled."
+        );
+        keyPool.disable(req.key!, "revoked");
+        errorPayload.proxy_note = `Assigned API key cannot be used.`;
+        return;
+      }
+
       keyPool.markRateLimited(req.key!);
       await reenqueueRequest(req);
       throw new RetryableError("Rate-limited request re-enqueued.");
+    }
     default:
       errorPayload.proxy_note = `Unrecognized rate limit error from Google AI (${status}). Please report this.`;
       break;
@@ -665,15 +682,23 @@ const countResponseTokens: ProxyResHandlerWithBody = async (
     const completion = getCompletionFromBody(req, body);
     const tokens = await countTokens({ req, completion, service });
 
+    if (req.service === "openai" || req.service === "azure") {
+      // O1 consumes (a significant amount of) invisible tokens for the chain-
+      // of-thought reasoning. We have no way to count these other than to check
+      // the response body.
+      tokens.reasoning_tokens =
+        body.usage?.completion_tokens_details?.reasoning_tokens;
+    }
+
     req.log.debug(
-      { service, tokens, prevOutputTokens: req.outputTokens },
+      { service, prevOutputTokens: req.outputTokens, tokens },
       `Counted tokens for completion`
     );
     if (req.tokenizerInfo) {
       req.tokenizerInfo.completion_tokens = tokens;
     }
 
-    req.outputTokens = tokens.token_count;
+    req.outputTokens = tokens.token_count + (tokens.reasoning_tokens ?? 0);
   } catch (error) {
     req.log.warn(
       error,
@@ -684,26 +709,29 @@ const countResponseTokens: ProxyResHandlerWithBody = async (
   }
 };
 
-const trackRateLimit: ProxyResHandlerWithBody = async (proxyRes, req) => {
+const trackKeyRateLimit: ProxyResHandlerWithBody = async (proxyRes, req) => {
   keyPool.updateRateLimits(req.key!, proxyRes.headers);
 };
 
+const omittedHeaders = new Set<string>([
+  // Omit content-encoding because we will always decode the response body
+  "content-encoding",
+  // Omit transfer-encoding because we are using response.json which will
+  // set a content-length header, which is not valid for chunked responses.
+  "transfer-encoding",
+  // Don't set cookies from upstream APIs because proxied requests are stateless
+  "set-cookie",
+  "openai-organization",
+  "x-request-id",
+  "cf-ray",
+]);
 const copyHttpHeaders: ProxyResHandlerWithBody = async (
   proxyRes,
   _req,
   res
 ) => {
   Object.keys(proxyRes.headers).forEach((key) => {
-    // Omit content-encoding because we will always decode the response body
-    if (key === "content-encoding") {
-      return;
-    }
-    // We're usually using res.json() to send the response, which causes express
-    // to set content-length. That's not valid for chunked responses and some
-    // clients will reject it so we need to omit it.
-    if (key === "transfer-encoding") {
-      return;
-    }
+    if (omittedHeaders.has(key)) return;
     res.setHeader(key, proxyRes.headers[key] as string);
   });
 };
@@ -714,7 +742,7 @@ const copyHttpHeaders: ProxyResHandlerWithBody = async (
  * or transformed.
  * Only used for non-streaming requests.
  */
-const addProxyInfo: ProxyResHandlerWithBody = async (
+const injectProxyInfo: ProxyResHandlerWithBody = async (
   _proxyRes,
   req,
   res,
@@ -747,6 +775,6 @@ function getAwsErrorType(header: string | string[] | undefined) {
 
 function assertJsonResponse(body: any): asserts body is Record<string, any> {
   if (typeof body !== "object") {
-    throw new Error("Expected response to be an object");
+    throw new Error(`Expected response to be an object, got ${typeof body}`);
   }
 }

src/proxy/middleware/response/log-event.ts

@@ -0,0 +1,81 @@
+import { createHash } from "crypto";
+import { config } from "../../../config";
+import { eventLogger } from "../../../shared/prompt-logging";
+import { getModelFromBody, isTextGenerationRequest } from "../common";
+import { ProxyResHandlerWithBody } from ".";
+import {
+  OpenAIChatMessage,
+  AnthropicChatMessage,
+} from "../../../shared/api-schemas";
+
+/** If event logging is enabled, logs a chat completion event. */
+export const logEvent: ProxyResHandlerWithBody = async (
+  _proxyRes,
+  req,
+  _res,
+  responseBody
+) => {
+  if (!config.eventLogging) {
+    return;
+  }
+  if (typeof responseBody !== "object") {
+    throw new Error("Expected body to be an object");
+  }
+  if (!["openai", "anthropic-chat"].includes(req.outboundApi)) {
+    // only chat apis are supported
+    return;
+  }
+  if (!req.user) {
+    return;
+  }
+
+  const loggable = isTextGenerationRequest(req);
+  if (!loggable) return;
+
+  const messages = req.body.messages as
+    | OpenAIChatMessage[]
+    | AnthropicChatMessage[];
+
+  let hashes = [];
+  hashes.push(hashMessages(messages));
+  for (
+    let i = 1;
+    i <= Math.min(config.eventLoggingTrim!, messages.length);
+    i++
+  ) {
+    hashes.push(hashMessages(messages.slice(0, -i)));
+  }
+
+  const model = getModelFromBody(req, responseBody);
+  const userToken = req.user!.token;
+  const family = req.modelFamily!;
+  eventLogger.logEvent({
+    ip: req.ip,
+    type: "chat_completion",
+    model,
+    family,
+    hashes,
+    userToken,
+    inputTokens: req.promptTokens ?? 0,
+    outputTokens: req.outputTokens ?? 0,
+  });
+};
+
+const hashMessages = (
+  messages: OpenAIChatMessage[] | AnthropicChatMessage[]
+): string => {
+  let hasher = createHash("sha256");
+  let messageTexts = [];
+  for (const msg of messages) {
+    if (!["system", "user", "assistant"].includes(msg.role)) continue;
+    if (typeof msg.content === "string") {
+      messageTexts.push(msg.content);
+    } else if (Array.isArray(msg.content)) {
+      if (msg.content[0].type === "text") {
+        messageTexts.push(msg.content[0].text);
+      }
+    }
+  }
+  hasher.update(messageTexts.join("<|im_sep|>"));
+  return hasher.digest("hex");
+};

src/proxy/middleware/response/log-prompt.ts

@@ -12,10 +12,10 @@ import { assertNever } from "../../../shared/utils";
 import {
   AnthropicChatMessage,
   flattenAnthropicMessages,
+  GoogleAIChatMessage,
   MistralAIChatMessage,
   OpenAIChatMessage,
 } from "../../../shared/api-schemas";
-import { APIFormat } from "../../../shared/key-management";
 
 /** If prompt logging is enabled, enqueues the prompt for logging. */
 export const logPrompt: ProxyResHandlerWithBody = async (
@@ -36,7 +36,7 @@ export const logPrompt: ProxyResHandlerWithBody = async (
   if (!loggable) return;
 
   const promptPayload = getPromptForRequest(req, responseBody);
-  const promptFlattened = flattenMessages(promptPayload, req.outboundApi);
+  const promptFlattened = flattenMessages(promptPayload);
   const response = getCompletionFromBody(req, responseBody);
   const model = getModelFromBody(req, responseBody);
 
@@ -63,7 +63,8 @@ const getPromptForRequest = (
 ):
   | string
   | OpenAIChatMessage[]
-  | AnthropicChatMessage[]
+  | { contents: GoogleAIChatMessage[] }
+  | { system: string; messages: AnthropicChatMessage[] }
   | MistralAIChatMessage[]
   | OaiImageResult => {
   // Since the prompt logger only runs after the request has been proxied, we
@@ -72,9 +73,18 @@ const getPromptForRequest = (
   switch (req.outboundApi) {
     case "openai":
     case "mistral-ai":
-    case "anthropic-chat":
       return req.body.messages;
+    case "anthropic-chat":
+      let system = req.body.system;
+      if (Array.isArray(system)) {
+        system = system
+          .map((m: { type: string; text: string }) => m.text)
+          .join("\n");
+      }
+      return { system, messages: req.body.messages };
     case "openai-text":
+    case "anthropic-text":
+    case "mistral-text":
       return req.body.prompt;
     case "openai-image":
       return {
@@ -84,10 +94,8 @@ const getPromptForRequest = (
         quality: req.body.quality,
         revisedPrompt: responseBody.data[0].revised_prompt,
       };
-    case "anthropic-text":
-      return req.body.prompt;
     case "google-ai":
-      return req.body.prompt.text;
+      return { contents: req.body.contents };
     default:
       assertNever(req.outboundApi);
   }
@@ -98,15 +106,24 @@ const flattenMessages = (
     | string
     | OaiImageResult
     | OpenAIChatMessage[]
-    | AnthropicChatMessage[]
-    | MistralAIChatMessage[],
-  format: APIFormat
+    | { contents: GoogleAIChatMessage[] }
+    | { system: string; messages: AnthropicChatMessage[] }
+    | MistralAIChatMessage[]
 ): string => {
   if (typeof val === "string") {
     return val.trim();
   }
-  if (format === "anthropic-chat") {
-    return flattenAnthropicMessages(val as AnthropicChatMessage[]);
+  if (isAnthropicChatPrompt(val)) {
+    const { system, messages } = val;
+    return `System: ${system}\n\n${flattenAnthropicMessages(messages)}`;
+  }
+  if (isGoogleAIChatPrompt(val)) {
+    return val.contents
+      .map(({ parts, role }) => {
+        const text = parts.map((p) => p.text).join("\n");
+        return `${role}: ${text}`;
+      })
+      .join("\n");
   }
   if (Array.isArray(val)) {
     return val
@@ -127,3 +144,20 @@ const flattenMessages = (
   }
   return val.prompt.trim();
 };
+
+function isGoogleAIChatPrompt(
+  val: unknown
+): val is { contents: GoogleAIChatMessage[] } {
+  return typeof val === "object" && val !== null && "contents" in val;
+}
+
+function isAnthropicChatPrompt(
+  val: unknown
+): val is { system: string; messages: AnthropicChatMessage[] } {
+  return (
+    typeof val === "object" &&
+    val !== null &&
+    "system" in val &&
+    "messages" in val
+  );
+}

src/proxy/middleware/response/streaming/aggregators/mistral-chat.ts

@@ -0,0 +1,39 @@
+import { OpenAIChatCompletionStreamEvent } from "../index";
+
+export type MistralChatCompletionResponse = {
+  choices: {
+    index: number;
+    message: { role: string; content: string };
+    finish_reason: string | null;
+  }[];
+};
+
+/**
+ * Given a list of OpenAI chat completion events, compiles them into a single
+ * finalized Mistral chat completion response so that non-streaming middleware
+ * can operate on it as if it were a blocking response.
+ */
+export function mergeEventsForMistralChat(
+  events: OpenAIChatCompletionStreamEvent[]
+): MistralChatCompletionResponse {
+  let merged: MistralChatCompletionResponse = {
+    choices: [
+      { index: 0, message: { role: "", content: "" }, finish_reason: "" },
+    ],
+  };
+  merged = events.reduce((acc, event, i) => {
+    // The first event will only contain role assignment and response metadata
+    if (i === 0) {
+      acc.choices[0].message.role = event.choices[0].delta.role ?? "assistant";
+      return acc;
+    }
+
+    acc.choices[0].finish_reason = event.choices[0].finish_reason ?? "";
+    if (event.choices[0].delta.content) {
+      acc.choices[0].message.content += event.choices[0].delta.content;
+    }
+
+    return acc;
+  }, merged);
+  return merged;
+}

src/proxy/middleware/response/streaming/aggregators/mistral-text.ts

@@ -0,0 +1,33 @@
+import { OpenAIChatCompletionStreamEvent } from "../index";
+
+export type MistralTextCompletionResponse = {
+  outputs: {
+    text: string;
+    stop_reason: string | null;
+  }[];
+};
+
+/**
+ * Given a list of OpenAI chat completion events, compiles them into a single
+ * finalized Mistral text completion response so that non-streaming middleware
+ * can operate on it as if it were a blocking response.
+ */
+export function mergeEventsForMistralText(
+  events: OpenAIChatCompletionStreamEvent[]
+): MistralTextCompletionResponse {
+  let merged: MistralTextCompletionResponse = {
+    outputs: [{ text: "", stop_reason: "" }],
+  };
+  merged = events.reduce((acc, event, i) => {
+    // The first event will only contain role assignment and response metadata
+    if (i === 0) {
+      return acc;
+    }
+
+    acc.outputs[0].text += event.choices[0].delta.content ?? "";
+    acc.outputs[0].stop_reason = event.choices[0].finish_reason ?? "";
+
+    return acc;
+  }, merged);
+  return merged;
+}

src/proxy/middleware/response/streaming/aws-event-stream-decoder.ts

@@ -24,7 +24,7 @@ export function getAwsEventStreamDecoder(params: {
       if (eventType === "chunk") {
         result = input[eventType];
       } else {
-        // AWS unmarshaller treats non-chunk (errors and exceptions) oddly.
+        // AWS unmarshaller treats non-chunk events (errors and exceptions) oddly.
         result = { [eventType]: input[eventType] } as any;
       }
       return result;

src/proxy/middleware/response/streaming/event-aggregator.ts

@@ -1,3 +1,4 @@
+import express from "express";
 import { APIFormat } from "../../../../shared/key-management";
 import { assertNever } from "../../../../shared/utils";
 import {
@@ -6,8 +7,13 @@ import {
   mergeEventsForAnthropicText,
   mergeEventsForOpenAIChat,
   mergeEventsForOpenAIText,
+  mergeEventsForMistralChat,
+  mergeEventsForMistralText,
   AnthropicV2StreamEvent,
   OpenAIChatCompletionStreamEvent,
+  mistralAIToOpenAI,
+  MistralAIStreamEvent,
+  MistralChatCompletionEvent,
 } from "./index";
 
 /**
@@ -15,45 +21,70 @@ import {
  * compiles them into a single finalized response for downstream middleware.
  */
 export class EventAggregator {
-  private readonly format: APIFormat;
+  private readonly model: string;
+  private readonly requestFormat: APIFormat;
+  private readonly responseFormat: APIFormat;
   private readonly events: OpenAIChatCompletionStreamEvent[];
 
-  constructor({ format }: { format: APIFormat }) {
+  constructor({ body, inboundApi, outboundApi }: express.Request) {
     this.events = [];
-    this.format = format;
+    this.requestFormat = inboundApi;
+    this.responseFormat = outboundApi;
+    this.model = body.model;
   }
 
-  addEvent(event: OpenAIChatCompletionStreamEvent | AnthropicV2StreamEvent) {
+  addEvent(
+    event:
+      | OpenAIChatCompletionStreamEvent
+      | AnthropicV2StreamEvent
+      | MistralAIStreamEvent
+  ) {
     if (eventIsOpenAIEvent(event)) {
       this.events.push(event);
     } else {
       // horrible special case. previously all transformers' target format was
       // openai, so the event aggregator could conveniently assume all incoming
       // events were in openai format.
-      // now we have added anthropic-chat-to-text, so aggregator needs to know
-      // how to collapse events from two formats.
-      // because that is annoying, we will simply transform anthropic events to
-      // openai (even if the client didn't ask for openai) so we don't have to
-      // write aggregation logic for anthropic chat (which is also a troublesome
-      // stateful format).
-      const openAIEvent = anthropicV2ToOpenAI({
-        data: `event: completion\ndata: ${JSON.stringify(event)}\n\n`,
-        lastPosition: -1,
-        index: 0,
-        fallbackId: event.log_id || "event-aggregator-fallback",
-        fallbackModel: event.model || "claude-3-fallback",
-      });
-      if (openAIEvent.event) {
-        this.events.push(openAIEvent.event);
+      // now we have added some transformers that convert between non-openai
+      // formats, so aggregator needs to know how to collapse for more than
+      // just openai.
+      // because writing aggregation logic for every possible output format is
+      // annoying, we will just transform any non-openai output events to openai
+      // format (even if the client did not request openai at all) so that we
+      // still only need to write aggregators for openai SSEs.
+      let openAIEvent: OpenAIChatCompletionStreamEvent | undefined;
+      switch (this.requestFormat) {
+        case "anthropic-text":
+          assertIsAnthropicV2Event(event);
+          openAIEvent = anthropicV2ToOpenAI({
+            data: `event: completion\ndata: ${JSON.stringify(event)}\n\n`,
+            lastPosition: -1,
+            index: 0,
+            fallbackId: event.log_id || "fallback-" + Date.now(),
+            fallbackModel: event.model || this.model || "fallback-claude-3",
+          })?.event;
+          break;
+        case "mistral-ai":
+          assertIsMistralChatEvent(event);
+          openAIEvent = mistralAIToOpenAI({
+            data: `data: ${JSON.stringify(event)}\n\n`,
+            lastPosition: -1,
+            index: 0,
+            fallbackId: "fallback-" + Date.now(),
+            fallbackModel: this.model || "fallback-mistral",
+          })?.event;
+          break;
+      }
+      if (openAIEvent) {
+        this.events.push(openAIEvent);
       }
     }
   }
 
   getFinalResponse() {
-    switch (this.format) {
+    switch (this.responseFormat) {
       case "openai":
-      case "google-ai":
-      case "mistral-ai":
+      case "google-ai": // TODO: this is probably wrong now that we support native Google Makersuite prompts
         return mergeEventsForOpenAIChat(this.events);
       case "openai-text":
         return mergeEventsForOpenAIText(this.events);
@@ -61,12 +92,22 @@ export class EventAggregator {
         return mergeEventsForAnthropicText(this.events);
       case "anthropic-chat":
         return mergeEventsForAnthropicChat(this.events);
+      case "mistral-ai":
+        return mergeEventsForMistralChat(this.events);
+      case "mistral-text":
+        return mergeEventsForMistralText(this.events);
       case "openai-image":
-        throw new Error(`SSE aggregation not supported for ${this.format}`);
+        throw new Error(
+          `SSE aggregation not supported for ${this.responseFormat}`
+        );
       default:
-        assertNever(this.format);
+        assertNever(this.responseFormat);
     }
   }
+
+  hasEvents() {
+    return this.events.length > 0;
+  }
 }
 
 function eventIsOpenAIEvent(
@@ -74,3 +115,17 @@ function eventIsOpenAIEvent(
 ): event is OpenAIChatCompletionStreamEvent {
   return event?.object === "chat.completion.chunk";
 }
+
+function assertIsAnthropicV2Event(event: any): asserts event is AnthropicV2StreamEvent {
+  if (!event?.completion) {
+    throw new Error(`Bad event for Anthropic V2 SSE aggregation`);
+  }
+}
+
+function assertIsMistralChatEvent(
+  event: any
+): asserts event is MistralChatCompletionEvent {
+  if (!event?.choices) {
+    throw new Error(`Bad event for Mistral SSE aggregation`);
+  }
+}

src/proxy/middleware/response/streaming/index.ts

@@ -7,6 +7,25 @@ export type SSEResponseTransformArgs<S = Record<string, any>> = {
   state?: S;
 };
 
+export type MistralChatCompletionEvent = {
+  choices: {
+    index: number;
+    message: { role: string; content: string };
+    stop_reason: string | null;
+  }[];
+};
+export type MistralTextCompletionEvent = {
+  outputs: { text: string; stop_reason: string | null }[];
+};
+export type MistralAIStreamEvent = {
+  "amazon-bedrock-invocationMetrics"?: {
+    inputTokenCount: number;
+    outputTokenCount: number;
+    invocationLatency: number;
+    firstByteLatency: number;
+  };
+} & (MistralChatCompletionEvent | MistralTextCompletionEvent);
+
 export type AnthropicV2StreamEvent = {
   log_id?: string;
   model?: string;
@@ -41,8 +60,12 @@ export { anthropicV2ToOpenAI } from "./transformers/anthropic-v2-to-openai";
 export { anthropicChatToAnthropicV2 } from "./transformers/anthropic-chat-to-anthropic-v2";
 export { anthropicChatToOpenAI } from "./transformers/anthropic-chat-to-openai";
 export { googleAIToOpenAI } from "./transformers/google-ai-to-openai";
+export { mistralAIToOpenAI } from "./transformers/mistral-ai-to-openai";
+export { mistralTextToMistralChat } from "./transformers/mistral-text-to-mistral-chat";
 export { passthroughToOpenAI } from "./transformers/passthrough-to-openai";
 export { mergeEventsForOpenAIChat } from "./aggregators/openai-chat";
 export { mergeEventsForOpenAIText } from "./aggregators/openai-text";
 export { mergeEventsForAnthropicText } from "./aggregators/anthropic-text";
 export { mergeEventsForAnthropicChat } from "./aggregators/anthropic-chat";
+export { mergeEventsForMistralChat } from "./aggregators/mistral-chat";
+export { mergeEventsForMistralText } from "./aggregators/mistral-text";

src/proxy/middleware/response/streaming/sse-message-transformer.ts

@@ -11,8 +11,11 @@ import {
   googleAIToOpenAI,
   OpenAIChatCompletionStreamEvent,
   openAITextToOpenAIChat,
+  mistralAIToOpenAI,
+  mistralTextToMistralChat,
   passthroughToOpenAI,
   StreamingCompletionTransformer,
+  MistralChatCompletionEvent,
 } from "./index";
 
 type SSEMessageTransformerOptions = TransformOptions & {
@@ -35,7 +38,9 @@ export class SSEMessageTransformer extends Transform {
   private readonly inputFormat: APIFormat;
   private readonly transformFn: StreamingCompletionTransformer<
     // TODO: Refactor transformers to not assume only OpenAI events as output
-    OpenAIChatCompletionStreamEvent | AnthropicV2StreamEvent
+    | OpenAIChatCompletionStreamEvent
+    | AnthropicV2StreamEvent
+    | MistralChatCompletionEvent
   >;
   private readonly log;
   private readonly fallbackId: string;
@@ -121,16 +126,17 @@ function eventIsOpenAIEvent(
 function getTransformer(
   responseApi: APIFormat,
   version?: string,
-  // There's only one case where we're not transforming back to OpenAI, which is
-  // Anthropic Chat response -> Anthropic Text request. This parameter is only
-  // used for that case.
+  // In most cases, we are transforming back to OpenAI. Some responses can be
+  // translated between two non-OpenAI formats, eg Anthropic Chat -> Anthropic
+  // Text, or Mistral Text -> Mistral Chat.
   requestApi: APIFormat = "openai"
 ): StreamingCompletionTransformer<
-  OpenAIChatCompletionStreamEvent | AnthropicV2StreamEvent
+  | OpenAIChatCompletionStreamEvent
+  | AnthropicV2StreamEvent
+  | MistralChatCompletionEvent
 > {
   switch (responseApi) {
     case "openai":
-    case "mistral-ai":
       return passthroughToOpenAI;
     case "openai-text":
       return openAITextToOpenAIChat;
@@ -140,10 +146,16 @@ function getTransformer(
         : anthropicV2ToOpenAI;
     case "anthropic-chat":
       return requestApi === "anthropic-text"
-        ? anthropicChatToAnthropicV2
+        ? anthropicChatToAnthropicV2 // User's legacy text prompt was converted to chat, and response must be converted back to text
         : anthropicChatToOpenAI;
     case "google-ai":
       return googleAIToOpenAI;
+    case "mistral-ai":
+      return mistralAIToOpenAI;
+    case "mistral-text":
+      return requestApi === "mistral-ai"
+        ? mistralTextToMistralChat // User's chat request was converted to text, and response must be converted back to chat
+        : mistralAIToOpenAI;
     case "openai-image":
       throw new Error(`SSE transformation not supported for ${responseApi}`);
     default:

src/proxy/middleware/response/streaming/sse-stream-adapter.ts

@@ -2,9 +2,7 @@ import pino from "pino";
 import { Transform, TransformOptions } from "stream";
 import { Message } from "@smithy/eventstream-codec";
 import { APIFormat } from "../../../../shared/key-management";
-import { RetryableError } from "../index";
-import { buildSpoofedSSE } from "../error-generator";
-import { BadRequestError } from "../../../../shared/errors";
+import { BadRequestError, RetryableError } from "../../../../shared/errors";
 
 type SSEStreamAdapterOptions = TransformOptions & {
   contentType?: string;
@@ -21,7 +19,6 @@ type SSEStreamAdapterOptions = TransformOptions & {
  */
 export class SSEStreamAdapter extends Transform {
   private readonly isAwsStream;
-  private readonly isGoogleStream;
   private api: APIFormat;
   private partialMessage = "";
   private textDecoder = new TextDecoder("utf8");
@@ -31,7 +28,6 @@ export class SSEStreamAdapter extends Transform {
     super({ ...options, objectMode: true });
     this.isAwsStream =
       options?.contentType === "application/vnd.amazon.eventstream";
-    this.isGoogleStream = options?.api === "google-ai";
     this.api = options.api;
     this.log = options.logger.child({ module: "sse-stream-adapter" });
   }
@@ -56,8 +52,10 @@ export class SSEStreamAdapter extends Transform {
 
           if ("completion" in eventObj) {
             return ["event: completion", `data: ${event}`].join(`\n`);
-          } else {
+          } else if (eventObj.type) {
             return [`event: ${eventObj.type}`, `data: ${event}`].join(`\n`);
+          } else {
+            return `data: ${event}`;
           }
         }
       // noinspection FallThroughInSwitchStatementJS -- non-JSON data is unexpected
@@ -109,44 +107,12 @@ export class SSEStreamAdapter extends Transform {
     }
   }
 
-  /** Processes an incoming array element from the Google AI JSON stream. */
-  protected processGoogleObject(data: any): string | null {
-    // Sometimes data has fields key and value, sometimes it's just the
-    // candidates array.
-    const candidates = data.value?.candidates ?? data.candidates ?? [{}];
-    try {
-      const hasParts = candidates[0].content?.parts?.length > 0;
-      if (hasParts) {
-        return `data: ${JSON.stringify(data)}`;
-      } else {
-        this.log.error({ event: data }, "Received bad Google AI event");
-        return `data: ${buildSpoofedSSE({
-          format: "google-ai",
-          title: "Proxy stream error",
-          message:
-            "The proxy received malformed or unexpected data from Google AI while streaming.",
-          obj: data,
-          reqId: "proxy-sse-adapter-message",
-          model: "",
-        })}`;
-      }
-    } catch (error) {
-      error.lastEvent = data;
-      this.emit("error", error);
-    }
-    return null;
-  }
-
   _transform(data: any, _enc: string, callback: (err?: Error | null) => void) {
     try {
       if (this.isAwsStream) {
         // `data` is a Message object
         const message = this.processAwsMessage(data);
         if (message) this.push(message + "\n\n");
-      } else if (this.isGoogleStream) {
-        // `data` is an element from the Google AI JSON stream
-        const message = this.processGoogleObject(data);
-        if (message) this.push(message + "\n\n");
       } else {
         // `data` is a string, but possibly only a partial message
         const fullMessages = (this.partialMessage + data).split(

src/proxy/middleware/response/streaming/transformers/anthropic-chat-to-openai.ts

@@ -34,7 +34,7 @@ export const anthropicChatToOpenAI: StreamingCompletionTransformer = (
     model: params.fallbackModel,
     choices: [
       {
-        index: params.index,
+        index: 0,
         delta: { content: deltaEvent.delta.text },
         finish_reason: null,
       },

src/proxy/middleware/response/streaming/transformers/google-ai-to-openai.ts

@@ -9,7 +9,7 @@ const log = logger.child({
 
 type GoogleAIStreamEvent = {
   candidates: {
-    content: { parts: { text: string }[]; role: string };
+    content?: { parts?: { text: string }[]; role: string };
     finishReason?: "STOP" | "MAX_TOKENS" | "SAFETY" | "RECITATION" | "OTHER";
     index: number;
     tokenCount?: number;
@@ -34,9 +34,15 @@ export const googleAIToOpenAI: StreamingCompletionTransformer = (params) => {
     return { position: -1 };
   }
 
-  const parts = completionEvent.candidates[0].content.parts;
+  const parts = completionEvent.candidates[0].content?.parts || [];
   let content = parts[0]?.text ?? "";
 
+  if (isSafetyStop(completionEvent)) {
+    content = `[Proxy Warning] Gemini safety filter triggered: ${JSON.stringify(
+      completionEvent.candidates[0].safetyRatings
+    )}`;
+  }
+
   // If this is the first chunk, try stripping speaker names from the response
   // e.g. "John: Hello" -> "Hello"
   if (index === 0) {
@@ -60,6 +66,14 @@ export const googleAIToOpenAI: StreamingCompletionTransformer = (params) => {
   return { position: -1, event: newEvent };
 };
 
+function isSafetyStop(completion: GoogleAIStreamEvent) {
+  const isSafetyStop = ["SAFETY", "OTHER"].includes(
+    completion.candidates[0].finishReason ?? ""
+  );
+  const hasNoContent = completion.candidates[0].content?.parts?.length === 0;
+  return isSafetyStop && hasNoContent;
+}
+
 function asCompletion(event: ServerSentEvent): GoogleAIStreamEvent | null {
   try {
     const parsed = JSON.parse(event.data) as GoogleAIStreamEvent;

src/proxy/middleware/response/streaming/transformers/mistral-ai-to-openai.ts

@@ -0,0 +1,76 @@
+import { logger } from "../../../../../logger";
+import { MistralAIStreamEvent, SSEResponseTransformArgs } from "../index";
+import { parseEvent, ServerSentEvent } from "../parse-sse";
+
+const log = logger.child({
+  module: "sse-transformer",
+  transformer: "mistral-ai-to-openai",
+});
+
+export const mistralAIToOpenAI = (params: SSEResponseTransformArgs) => {
+  const { data } = params;
+
+  const rawEvent = parseEvent(data);
+  if (!rawEvent.data || rawEvent.data === "[DONE]") {
+    return { position: -1 };
+  }
+
+  const completionEvent = asCompletion(rawEvent);
+  if (!completionEvent) {
+    return { position: -1 };
+  }
+
+  if ("choices" in completionEvent) {
+    const newChatEvent = {
+      id: params.fallbackId,
+      object: "chat.completion.chunk" as const,
+      created: Date.now(),
+      model: params.fallbackModel,
+      choices: [
+        {
+          index: completionEvent.choices[0].index,
+          delta: { content: completionEvent.choices[0].message.content },
+          finish_reason: completionEvent.choices[0].stop_reason,
+        },
+      ],
+    };
+    return { position: -1, event: newChatEvent };
+  } else if ("outputs" in completionEvent) {
+    const newTextEvent = {
+      id: params.fallbackId,
+      object: "chat.completion.chunk" as const,
+      created: Date.now(),
+      model: params.fallbackModel,
+      choices: [
+        {
+          index: 0,
+          delta: { content: completionEvent.outputs[0].text },
+          finish_reason: completionEvent.outputs[0].stop_reason,
+        },
+      ],
+    };
+    return { position: -1, event: newTextEvent };
+  }
+
+  // should never happen
+  return { position: -1 };
+};
+
+function asCompletion(event: ServerSentEvent): MistralAIStreamEvent | null {
+  try {
+    const parsed = JSON.parse(event.data);
+    if (
+      (Array.isArray(parsed.choices) &&
+        parsed.choices[0].message !== undefined) ||
+      (Array.isArray(parsed.outputs) && parsed.outputs[0].text !== undefined)
+    ) {
+      return parsed;
+    } else {
+      // noinspection ExceptionCaughtLocallyJS
+      throw new Error("Missing required fields");
+    }
+  } catch (error) {
+    log.warn({ error: error.stack, event }, "Received invalid data event");
+  }
+  return null;
+}

src/proxy/middleware/response/streaming/transformers/mistral-text-to-mistral-chat.ts

@@ -0,0 +1,63 @@
+import {
+  MistralChatCompletionEvent,
+  MistralTextCompletionEvent,
+  StreamingCompletionTransformer,
+} from "../index";
+import { parseEvent, ServerSentEvent } from "../parse-sse";
+import { logger } from "../../../../../logger";
+
+const log = logger.child({
+  module: "sse-transformer",
+  transformer: "mistral-text-to-mistral-chat",
+});
+
+/**
+ * Transforms an incoming Mistral Text SSE to an equivalent Mistral Chat SSE.
+ * This is generally used when a client sends a Mistral Chat prompt, but we
+ * convert it to Mistral Text before sending it to the API to work around
+ * some bugs in Mistral/AWS prompt templating. In these cases we need to convert
+ * the response back to Mistral Chat.
+ */
+export const mistralTextToMistralChat: StreamingCompletionTransformer<
+  MistralChatCompletionEvent
+> = (params) => {
+  const { data } = params;
+
+  const rawEvent = parseEvent(data);
+  if (!rawEvent.data) {
+    return { position: -1 };
+  }
+
+  const textCompletion = asTextCompletion(rawEvent);
+  if (!textCompletion) {
+    return { position: -1 };
+  }
+
+  const chatEvent: MistralChatCompletionEvent = {
+    choices: [
+      {
+        index: 0,
+        message: { role: "assistant", content: textCompletion.outputs[0].text },
+        stop_reason: textCompletion.outputs[0].stop_reason,
+      },
+    ],
+  };
+  return { position: -1, event: chatEvent };
+};
+
+function asTextCompletion(
+  event: ServerSentEvent
+): MistralTextCompletionEvent | null {
+  try {
+    const parsed = JSON.parse(event.data);
+    if (Array.isArray(parsed.outputs) && parsed.outputs[0].text !== undefined) {
+      return parsed;
+    } else {
+      // noinspection ExceptionCaughtLocallyJS
+      throw new Error("Missing required fields");
+    }
+  } catch (error: any) {
+    log.warn({ error: error.stack, event }, "Received invalid data event");
+  }
+  return null;
+}

src/proxy/mistral-ai.ts

@@ -1,48 +1,61 @@
-import { RequestHandler, Router } from "express";
-import { createProxyMiddleware } from "http-proxy-middleware";
-import { config } from "../config";
+import { Request, RequestHandler, Router } from "express";
+import { BadRequestError } from "../shared/errors";
 import { keyPool } from "../shared/key-management";
 import {
   getMistralAIModelFamily,
   MistralAIModelFamily,
   ModelFamily,
 } from "../shared/models";
-import { logger } from "../logger";
-import { createQueueMiddleware } from "./queue";
+import { config } from "../config";
 import { ipLimiter } from "./rate-limit";
-import { handleProxyError } from "./middleware/common";
 import {
   addKey,
-  createOnProxyReqHandler,
   createPreprocessorMiddleware,
   finalizeBody,
 } from "./middleware/request";
-import {
-  createOnProxyResHandler,
-  ProxyResHandlerWithBody,
-} from "./middleware/response";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
 
+// Mistral can't settle on a single naming scheme and deprecates models within
+// months of releasing them so this list is hard to keep up to date. 2024-07-28
 // https://docs.mistral.ai/platform/endpoints
 export const KNOWN_MISTRAL_AI_MODELS = [
-  // Mistral 7b (open weight, legacy)
+  /*
+  Mistral Nemo
+  "A 12B model built with the partnership with Nvidia.  It is easy to use and a
+  drop-in replacement in any system using Mistral 7B that it supersedes."
+  */
+  "open-mistral-nemo",
+  "open-mistral-nemo-2407",
+  /*
+  Mistral Large
+  "Our flagship model with state-of-the-art reasoning, knowledge, and coding
+  capabilities."
+  */
+  "mistral-large-latest",
+  "mistral-large-2407",
+  "mistral-large-2402", // deprecated
+  /*
+  Codestral
+  "A cutting-edge generative model that has been specifically designed and
+  optimized for code generation tasks, including fill-in-the-middle and code
+  completion."
+  note: this uses a separate bidi completion endpoint that is not implemented
+  */
+  "codestral-latest",
+  "codestral-2405",
+  /* So-called "Research Models" */
   "open-mistral-7b",
-  "mistral-tiny-2312",
-  // Mixtral 8x7b (open weight, legacy)
   "open-mixtral-8x7b",
-  "mistral-small-2312",
-  // Mixtral Small (newer 8x7b, closed weight)
+  "open-mistral-8x22b",
+  "open-codestral-mamba",
+  /* Deprecated production models */
   "mistral-small-latest",
   "mistral-small-2402",
-  // Mistral Medium
   "mistral-medium-latest",
   "mistral-medium-2312",
-  // Mistral Large
-  "mistral-large-latest",
-  "mistral-large-2402",
-  // Deprecated identifiers (2024-05-01)
   "mistral-tiny",
-  "mistral-small",
-  "mistral-medium",
+  "mistral-tiny-2312",
 ];
 
 let modelsCache: any = null;
@@ -70,7 +83,7 @@ export function generateModelList(models = KNOWN_MISTRAL_AI_MODELS) {
 }
 
 const handleModelRequest: RequestHandler = (_req, res) => {
-  if (new Date().getTime() - modelsCacheTime < 1000 * 60){
+  if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
     return res.status(200).json(modelsCache);
   }
   const result = generateModelList();
@@ -89,23 +102,28 @@ const mistralAIResponseHandler: ProxyResHandlerWithBody = async (
     throw new Error("Expected body to be an object");
   }
 
-  res.status(200).json({ ...body, proxy: body.proxy });
+  let newBody = body;
+  if (req.inboundApi === "mistral-text" && req.outboundApi === "mistral-ai") {
+    newBody = transformMistralTextToMistralChat(body);
+  }
+
+  res.status(200).json({ ...newBody, proxy: body.proxy });
 };
 
-const mistralAIProxy = createQueueMiddleware({
-  proxyMiddleware: createProxyMiddleware({
-    target: "https://api.mistral.ai",
-    changeOrigin: true,
-    selfHandleResponse: true,
-    logger,
-    on: {
-      proxyReq: createOnProxyReqHandler({
-        pipeline: [addKey, finalizeBody],
-      }),
-      proxyRes: createOnProxyResHandler([mistralAIResponseHandler]),
-      error: handleProxyError,
-    },
-  }),
+export function transformMistralTextToMistralChat(textBody: any) {
+  return {
+    ...textBody,
+    choices: [
+      { message: { content: textBody.outputs[0].text, role: "assistant" } },
+    ],
+    outputs: undefined,
+  };
+}
+
+const mistralAIProxy = createQueuedProxyMiddleware({
+  target: "https://api.mistral.ai",
+  mutations: [addKey, finalizeBody],
+  blockingResponseHandler: mistralAIResponseHandler,
 });
 
 const mistralAIRouter = Router();
@@ -114,12 +132,37 @@ mistralAIRouter.get("/v1/models", handleModelRequest);
 mistralAIRouter.post(
   "/v1/chat/completions",
   ipLimiter,
-  createPreprocessorMiddleware({
-    inApi: "mistral-ai",
-    outApi: "mistral-ai",
-    service: "mistral-ai",
-  }),
+  createPreprocessorMiddleware(
+    {
+      inApi: "mistral-ai",
+      outApi: "mistral-ai",
+      service: "mistral-ai",
+    },
+    { beforeTransform: [detectMistralInputApi] }
+  ),
   mistralAIProxy
 );
 
+/**
+ * We can't determine if a request is Mistral text or chat just from the path
+ * because they both use the same endpoint. We need to check the request body
+ * for either `messages` or `prompt`.
+ * @param req
+ */
+export function detectMistralInputApi(req: Request) {
+  const { messages, prompt } = req.body;
+  if (messages) {
+    req.inboundApi = "mistral-ai";
+    req.outboundApi = "mistral-ai";
+  } else if (prompt && req.service === "mistral-ai") {
+    // Mistral La Plateforme doesn't expose a text completions endpoint.
+    throw new BadRequestError(
+      "Mistral (via La Plateforme API) does not support text completions. This format is only supported on Mistral via the AWS API."
+    );
+  } else if (prompt && req.service === "aws") {
+    req.inboundApi = "mistral-text";
+    req.outboundApi = "mistral-text";
+  }
+}
+
 export const mistralAI = mistralAIRouter;

src/proxy/openai-image.ts

@@ -1,22 +1,15 @@
-import { RequestHandler, Router, Request } from "express";
-import { createProxyMiddleware } from "http-proxy-middleware";
-import { config } from "../config";
-import { logger } from "../logger";
-import { createQueueMiddleware } from "./queue";
+import { Request, RequestHandler, Router } from "express";
+import { OpenAIImageGenerationResult } from "../shared/file-storage/mirror-generated-image";
+import { generateModelList } from "./openai";
 import { ipLimiter } from "./rate-limit";
-import { handleProxyError } from "./middleware/common";
 import {
   addKey,
   createPreprocessorMiddleware,
   finalizeBody,
-  createOnProxyReqHandler,
 } from "./middleware/request";
-import {
-  createOnProxyResHandler,
-  ProxyResHandlerWithBody,
-} from "./middleware/response";
-import { generateModelList } from "./openai";
-import { OpenAIImageGenerationResult } from "../shared/file-storage/mirror-generated-image";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import { ProxyReqManager } from "./middleware/request/proxy-req-manager";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
 
 const KNOWN_MODELS = ["dall-e-2", "dall-e-3"];
 
@@ -26,7 +19,9 @@ const handleModelRequest: RequestHandler = (_req, res) => {
   if (new Date().getTime() - modelListValid < 1000 * 60) {
     return res.status(200).json(modelListCache);
   }
-  const result = generateModelList(KNOWN_MODELS);
+  const result = generateModelList("openai").filter((m: { id: string }) =>
+    KNOWN_MODELS.includes(m.id)
+  );
   modelListCache = { object: "list", data: result };
   modelListValid = new Date().getTime();
   res.status(200).json(modelListCache);
@@ -94,21 +89,19 @@ function transformResponseForChat(
   };
 }
 
-const openaiImagesProxy = createQueueMiddleware({
-  proxyMiddleware: createProxyMiddleware({
-    target: "https://api.openai.com",
-    changeOrigin: true,
-    selfHandleResponse: true,
-    logger,
-    pathRewrite: {
-      "^/v1/chat/completions": "/v1/images/generations",
-    },
-    on: {
-      proxyReq: createOnProxyReqHandler({ pipeline: [addKey, finalizeBody] }),
-      proxyRes: createOnProxyResHandler([openaiImagesResponseHandler]),
-      error: handleProxyError,
-    },
-  }),
+function replacePath(manager: ProxyReqManager) {
+  const req = manager.request;
+  const pathname = req.url.split("?")[0];
+  req.log.debug({ pathname }, "OpenAI image path filter");
+  if (req.path.startsWith("/v1/chat/completions")) {
+    manager.setPath("/v1/images/generations");
+  }
+}
+
+const openaiImagesProxy = createQueuedProxyMiddleware({
+  target: "https://api.openai.com",
+  mutations: [replacePath, addKey, finalizeBody],
+  blockingResponseHandler: openaiImagesResponseHandler,
 });
 
 const openaiImagesRouter = Router();

src/proxy/openai.ts

@@ -1,109 +1,80 @@
-import { RequestHandler, Router } from "express";
-import { createProxyMiddleware } from "http-proxy-middleware";
+import { Request, RequestHandler, Router } from "express";
 import { config } from "../config";
-import { keyPool, OpenAIKey } from "../shared/key-management";
-import {
-  getOpenAIModelFamily,
-  ModelFamily,
-  OpenAIModelFamily,
-} from "../shared/models";
-import { logger } from "../logger";
-import { createQueueMiddleware } from "./queue";
+import { AzureOpenAIKey, keyPool, OpenAIKey } from "../shared/key-management";
+import { getOpenAIModelFamily } from "../shared/models";
 import { ipLimiter } from "./rate-limit";
-import { handleProxyError } from "./middleware/common";
 import {
   addKey,
   addKeyForEmbeddingsRequest,
   createEmbeddingsPreprocessorMiddleware,
-  createOnProxyReqHandler,
   createPreprocessorMiddleware,
   finalizeBody,
-  forceModel,
   RequestPreprocessor,
 } from "./middleware/request";
-import {
-  createOnProxyResHandler,
-  ProxyResHandlerWithBody,
-} from "./middleware/response";
+import { ProxyResHandlerWithBody } from "./middleware/response";
+import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
 
 // https://platform.openai.com/docs/models/overview
-export const KNOWN_OPENAI_MODELS = [
-  "gpt-4-turbo-preview",
-  "gpt-4-0125-preview",
-  "gpt-4-1106-preview",
-  "gpt-4-vision-preview",
-  "gpt-4",
-  "gpt-4-0613",
-  "gpt-4-0314", // EOL 2024-06-13
-  "gpt-4-32k",
-  "gpt-4-32k-0314", // EOL 2024-06-13
-  "gpt-4-32k-0613",
-  "gpt-3.5-turbo",
-  "gpt-3.5-turbo-0301", // EOL 2024-06-13
-  "gpt-3.5-turbo-0613",
-  "gpt-3.5-turbo-16k",
-  "gpt-3.5-turbo-16k-0613",
-  "gpt-3.5-turbo-instruct",
-  "gpt-3.5-turbo-instruct-0914",
-  "text-embedding-ada-002",
-];
-
 let modelsCache: any = null;
 let modelsCacheTime = 0;
 
-export function generateModelList(models = KNOWN_OPENAI_MODELS) {
-  // Get available families and snapshots
-  let availableFamilies = new Set<OpenAIModelFamily>();
-  const availableSnapshots = new Set<string>();
-  for (const key of keyPool.list()) {
-    if (key.isDisabled || key.service !== "openai") continue;
-    const asOpenAIKey = key as OpenAIKey;
-    asOpenAIKey.modelFamilies.forEach((f) => availableFamilies.add(f));
-    asOpenAIKey.modelSnapshots.forEach((s) => availableSnapshots.add(s));
-  }
+export function generateModelList(service: "openai" | "azure") {
+  const keys = keyPool
+    .list()
+    .filter((k) => k.service === service && !k.isDisabled) as
+    | OpenAIKey[]
+    | AzureOpenAIKey[];
+  if (keys.length === 0) return [];
 
-  // Remove disabled families
-  const allowed = new Set<ModelFamily>(config.allowedModelFamilies);
-  availableFamilies = new Set(
-    [...availableFamilies].filter((x) => allowed.has(x))
+  const allowedModelFamilies = new Set(config.allowedModelFamilies);
+  const modelFamilies = new Set(
+    keys
+      .flatMap((k) => k.modelFamilies)
+      .filter((f) => allowedModelFamilies.has(f))
   );
 
-  return models
-    .map((id) => ({
-      id,
-      object: "model",
-      created: new Date().getTime(),
-      owned_by: "openai",
-      permission: [
-        {
-          id: "modelperm-" + id,
-          object: "model_permission",
-          created: new Date().getTime(),
-          organization: "*",
-          group: null,
-          is_blocking: false,
-        },
-      ],
-      root: id,
-      parent: null,
-    }))
-    .filter((model) => {
-      // First check if the family is available
-      const hasFamily = availableFamilies.has(getOpenAIModelFamily(model.id));
-      if (!hasFamily) return false;
+  const modelIds = new Set(
+    keys
+      .flatMap((k) => k.modelIds)
+      .filter((id) => {
+        const allowed = modelFamilies.has(getOpenAIModelFamily(id));
+        const known = ["gpt", "o1", "dall-e", "chatgpt", "text-embedding"].some(
+          (prefix) => id.startsWith(prefix)
+        );
+        const isFinetune = id.includes("ft");
+        return allowed && known && !isFinetune;
+      })
+  );
 
-      // Then for snapshots, ensure the specific snapshot is available
-      const isSnapshot = model.id.match(/-\d{4}(-preview)?$/);
-      if (!isSnapshot) return true;
-      return availableSnapshots.has(model.id);
-    });
+  return Array.from(modelIds).map((id) => ({
+    id,
+    object: "model",
+    created: new Date().getTime(),
+    owned_by: service,
+    permission: [
+      {
+        id: "modelperm-" + id,
+        object: "model_permission",
+        created: new Date().getTime(),
+        organization: "*",
+        group: null,
+        is_blocking: false,
+      },
+    ],
+    root: id,
+    parent: null,
+  }));
 }
 
 const handleModelRequest: RequestHandler = (_req, res) => {
   if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
     return res.status(200).json(modelsCache);
   }
-  const result = generateModelList();
+
+  if (!config.openaiKey) return { object: "list", data: [] };
+
+  const result = generateModelList("openai");
+
   modelsCache = { object: "list", data: result };
   modelsCacheTime = new Date().getTime();
   res.status(200).json(modelsCache);
@@ -147,7 +118,6 @@ const openaiResponseHandler: ProxyResHandlerWithBody = async (
   res.status(200).json({ ...newBody, proxy: body.proxy });
 };
 
-/** Only used for non-streaming responses. */
 function transformTurboInstructResponse(
   turboInstructBody: Record<string, any>
 ): Record<string, any> {
@@ -165,31 +135,15 @@ function transformTurboInstructResponse(
   return transformed;
 }
 
-const openaiProxy = createQueueMiddleware({
-  proxyMiddleware: createProxyMiddleware({
-    target: "https://api.openai.com",
-    changeOrigin: true,
-    selfHandleResponse: true,
-    logger,
-    on: {
-      proxyReq: createOnProxyReqHandler({ pipeline: [addKey, finalizeBody] }),
-      proxyRes: createOnProxyResHandler([openaiResponseHandler]),
-      error: handleProxyError,
-    },
-  }),
+const openaiProxy = createQueuedProxyMiddleware({
+  mutations: [addKey, finalizeBody],
+  target: "https://api.openai.com",
+  blockingResponseHandler: openaiResponseHandler,
 });
 
-const openaiEmbeddingsProxy = createProxyMiddleware({
+const openaiEmbeddingsProxy = createQueuedProxyMiddleware({
+  mutations: [addKeyForEmbeddingsRequest, finalizeBody],
   target: "https://api.openai.com",
-  changeOrigin: true,
-  selfHandleResponse: false,
-  logger,
-  on: {
-    proxyReq: createOnProxyReqHandler({
-      pipeline: [addKeyForEmbeddingsRequest, finalizeBody],
-    }),
-    error: handleProxyError,
-  },
 });
 
 const openaiRouter = Router();
@@ -222,11 +176,10 @@ openaiRouter.post(
 openaiRouter.post(
   "/v1/chat/completions",
   ipLimiter,
-  createPreprocessorMiddleware({
-    inApi: "openai",
-    outApi: "openai",
-    service: "openai",
-  }),
+  createPreprocessorMiddleware(
+    { inApi: "openai", outApi: "openai", service: "openai" },
+    { afterTransform: [fixupMaxTokens] }
+  ),
   openaiProxy
 );
 // Embeddings endpoint.
@@ -237,4 +190,15 @@ openaiRouter.post(
   openaiEmbeddingsProxy
 );
 
+function forceModel(model: string): RequestPreprocessor {
+  return (req: Request) => void (req.body.model = model);
+}
+
+function fixupMaxTokens(req: Request) {
+  if (!req.body.max_completion_tokens) {
+    req.body.max_completion_tokens = req.body.max_tokens;
+  }
+  delete req.body.max_tokens;
+}
+
 export const openai = openaiRouter;

src/proxy/queue.ts

@@ -12,7 +12,8 @@
  */
 
 import crypto from "crypto";
-import type { Handler, Request } from "express";
+import { Handler, Request } from "express";
+import { config } from "../config";
 import { BadRequestError, TooManyRequestsError } from "../shared/errors";
 import { keyPool } from "../shared/key-management";
 import {
@@ -22,24 +23,25 @@ import {
 } from "../shared/models";
 import { initializeSseStream } from "../shared/streaming";
 import { logger } from "../logger";
-import { getUniqueIps, SHARED_IP_ADDRESSES } from "./rate-limit";
-import { RequestPreprocessor } from "./middleware/request";
-import { handleProxyError } from "./middleware/common";
+import { getUniqueIps } from "./rate-limit";
+import { ProxyReqMutator, RequestPreprocessor } from "./middleware/request";
 import { sendErrorToClient } from "./middleware/response/error-generator";
+import { ProxyReqManager } from "./middleware/request/proxy-req-manager";
+import { classifyErrorAndSend } from "./middleware/common";
 
 const queue: Request[] = [];
 const log = logger.child({ module: "request-queue" });
 
-/** Maximum number of queue slots for Agnai.chat requests. */
-const AGNAI_CONCURRENCY_LIMIT = 5;
 /** Maximum number of queue slots for individual users. */
-const USER_CONCURRENCY_LIMIT = 1;
+const USER_CONCURRENCY_LIMIT = parseInt(
+  process.env.USER_CONCURRENCY_LIMIT ?? "1"
+);
 const MIN_HEARTBEAT_SIZE = parseInt(process.env.MIN_HEARTBEAT_SIZE_B ?? "512");
 const MAX_HEARTBEAT_SIZE =
   1024 * parseInt(process.env.MAX_HEARTBEAT_SIZE_KB ?? "1024");
 const HEARTBEAT_INTERVAL =
   1000 * parseInt(process.env.HEARTBEAT_INTERVAL_SEC ?? "5");
-const LOAD_THRESHOLD = parseFloat(process.env.LOAD_THRESHOLD ?? "50");
+const LOAD_THRESHOLD = parseFloat(process.env.LOAD_THRESHOLD ?? "150");
 const PAYLOAD_SCALE_FACTOR = parseFloat(
   process.env.PAYLOAD_SCALE_FACTOR ?? "6"
 );
@@ -58,39 +60,28 @@ const QUEUE_JOIN_TIMEOUT = 5000;
 function getIdentifier(req: Request) {
   if (req.user) return req.user.token;
   if (req.risuToken) return req.risuToken;
-  if (isFromSharedIp(req)) return "shared-ip";
+  // if (isFromSharedIp(req)) return "shared-ip";
   return req.ip;
 }
 
 const sharesIdentifierWith = (incoming: Request) => (queued: Request) =>
   getIdentifier(queued) === getIdentifier(incoming);
 
-const isFromSharedIp = (req: Request) => SHARED_IP_ADDRESSES.has(req.ip);
+async function enqueue(req: Request) {
+  if (req.socket.destroyed || req.res?.writableEnded) {
+    // In rare cases, a request can be disconnected after it is dequeued for a
+    // retry, but before it is re-enqueued. In this case we may miss the abort
+    // and the request will loop in the queue forever.
+    req.log.warn("Attempt to enqueue aborted request.");
+    throw new Error("Attempt to enqueue aborted request.");
+  }
 
-export async function enqueue(req: Request) {
   const enqueuedRequestCount = queue.filter(sharesIdentifierWith(req)).length;
-  let isGuest = req.user?.token === undefined;
 
-  // Requests from shared IP addresses such as Agnai.chat are exempt from IP-
-  // based rate limiting but can only occupy a certain number of slots in the
-  // queue. Authenticated users always get a single spot in the queue.
-  const isSharedIp = isFromSharedIp(req);
-  const maxConcurrentQueuedRequests =
-    isGuest && isSharedIp ? AGNAI_CONCURRENCY_LIMIT : USER_CONCURRENCY_LIMIT;
-  if (enqueuedRequestCount >= maxConcurrentQueuedRequests) {
-    if (isSharedIp) {
-      // Re-enqueued requests are not counted towards the limit since they
-      // already made it through the queue once.
-      if (req.retryCount === 0) {
-        throw new TooManyRequestsError(
-          "Too many agnai.chat requests are already queued"
-        );
-      }
-    } else {
-      throw new TooManyRequestsError(
-        "Your IP or user token already has another request in the queue."
-      );
-    }
+  if (enqueuedRequestCount >= USER_CONCURRENCY_LIMIT) {
+    throw new TooManyRequestsError(
+      "Your IP or user token already has another request in the queue."
+    );
   }
 
   // shitty hack to remove hpm's event listeners on retried requests
@@ -136,20 +127,17 @@ export async function enqueue(req: Request) {
   }
 }
 
+export async function reenqueueRequest(req: Request) {
+  req.log.info(
+    { key: req.key?.hash, retryCount: req.retryCount },
+    `Re-enqueueing request due to retryable error`
+  );
+  req.retryCount++;
+  await enqueue(req);
+}
+
 function getQueueForPartition(partition: ModelFamily): Request[] {
-  return queue
-    .filter((req) => getModelFamilyForRequest(req) === partition)
-    .sort((a, b) => {
-      // Certain requests are exempted from IP-based rate limiting because they
-      // come from a shared IP address. To prevent these requests from starving
-      // out other requests during periods of high traffic, we sort them to the
-      // end of the queue.
-      const aIsExempted = isFromSharedIp(a);
-      const bIsExempted = isFromSharedIp(b);
-      if (aIsExempted && !bIsExempted) return 1;
-      if (!aIsExempted && bIsExempted) return -1;
-      return 0;
-    });
+  return queue.filter((req) => getModelFamilyForRequest(req) === partition);
 }
 
 export function dequeue(partition: ModelFamily): Request | undefined {
@@ -160,7 +148,14 @@ export function dequeue(partition: ModelFamily): Request | undefined {
   }
 
   const req = modelQueue.reduce((prev, curr) =>
-    prev.startTime < curr.startTime ? prev : curr
+    prev.startTime +
+      config.tokensPunishmentFactor *
+        ((prev.promptTokens ?? 0) + (prev.outputTokens ?? 0)) <
+    curr.startTime +
+      config.tokensPunishmentFactor *
+        ((curr.promptTokens ?? 0) + (curr.outputTokens ?? 0))
+      ? prev
+      : curr
   );
   queue.splice(queue.indexOf(req), 1);
 
@@ -252,7 +247,6 @@ let waitTimes: {
   partition: ModelFamily;
   start: number;
   end: number;
-  isDeprioritized: boolean;
 }[] = [];
 
 /** Adds a successful request to the list of wait times. */
@@ -261,7 +255,6 @@ export function trackWaitTime(req: Request) {
     partition: getModelFamilyForRequest(req),
     start: req.startTime!,
     end: req.queueOutTime ?? Date.now(),
-    isDeprioritized: isFromSharedIp(req),
   });
 }
 
@@ -287,8 +280,7 @@ function calculateWaitTime(partition: ModelFamily) {
     .filter((wait) => {
       const isSamePartition = wait.partition === partition;
       const isRecent = now - wait.end < 300 * 1000;
-      const isNormalPriority = !wait.isDeprioritized;
-      return isSamePartition && isRecent && isNormalPriority;
+      return isSamePartition && isRecent;
     })
     .map((wait) => wait.end - wait.start);
   const recentAverage = recentWaits.length
@@ -302,11 +294,7 @@ function calculateWaitTime(partition: ModelFamily) {
   );
 
   const currentWaits = queue
-    .filter((req) => {
-      const isSamePartition = getModelFamilyForRequest(req) === partition;
-      const isNormalPriority = !isFromSharedIp(req);
-      return isSamePartition && isNormalPriority;
-    })
+    .filter((req) => getModelFamilyForRequest(req) === partition)
     .map((req) => now - req.startTime!);
   const longestCurrentWait = Math.max(...currentWaits, 0);
 
@@ -334,26 +322,35 @@ export function getQueueLength(partition: ModelFamily | "all" = "all") {
 }
 
 export function createQueueMiddleware({
-  beforeProxy,
+  mutations = [],
   proxyMiddleware,
 }: {
-  beforeProxy?: RequestPreprocessor;
+  mutations?: ProxyReqMutator[];
   proxyMiddleware: Handler;
 }): Handler {
   return async (req, res, next) => {
     req.proceed = async () => {
-      if (beforeProxy) {
-        try {
-          // Hack to let us run asynchronous middleware before the
-          // http-proxy-middleware handler. This is used to sign AWS requests
-          // before they are proxied, as the signing is asynchronous.
-          // Unlike RequestPreprocessors, this runs every time the request is
-          // dequeued, not just the first time.
-          await beforeProxy(req);
-        } catch (err) {
-          return handleProxyError(err, req, res);
+      // canonicalize the stream field which is set in a few places not always
+      // consistently
+      req.isStreaming = req.isStreaming || String(req.body.stream) === "true";
+      req.body.stream = req.isStreaming;
+
+      try {
+        // Just before executing the proxyMiddleware, we will create a
+        // ProxyReqManager to track modifications to the request. This allows
+        // us to revert those changes if the proxied request fails with a
+        // retryable error. That happens in proxyMiddleware's onProxyRes
+        // handler.
+        const changeManager = new ProxyReqManager(req);
+        req.changeManager = changeManager;
+        for (const mutator of mutations) {
+          await mutator(changeManager);
         }
+      } catch (err) {
+        // Failure during request preparation is a fatal error.
+        return classifyErrorAndSend(err, req, res);
       }
+
       proxyMiddleware(req, res, next);
     };
 

src/proxy/rate-limit.ts

@@ -1,14 +1,6 @@
 import { Request, Response, NextFunction } from "express";
 import { config } from "../config";
 
-export const SHARED_IP_ADDRESSES = new Set([
-  // Agnai.chat
-  "157.230.249.32", // old
-  "157.245.148.56",
-  "174.138.29.50",
-  "209.97.162.44",
-]);
-
 const ONE_MINUTE_MS = 60 * 1000;
 
 type Timestamp = number;
@@ -20,7 +12,10 @@ const exemptedRequests: Timestamp[] = [];
 const isRecentAttempt = (now: Timestamp) => (attempt: Timestamp) =>
   attempt > now - ONE_MINUTE_MS;
 
-const getTryAgainInMs = (ip: string, type: "text" | "image") => {
+/**
+ * Returns duration in seconds to wait before retrying for Retry-After header.
+ */
+const getRetryAfter = (ip: string, type: "text" | "image") => {
   const now = Date.now();
   const attempts = lastAttempts.get(ip) || [];
   const validAttempts = attempts.filter(isRecentAttempt(now));
@@ -29,7 +24,7 @@ const getTryAgainInMs = (ip: string, type: "text" | "image") => {
     type === "text" ? config.textModelRateLimit : config.imageModelRateLimit;
 
   if (validAttempts.length >= limit) {
-    return validAttempts[0] - now + ONE_MINUTE_MS;
+    return (validAttempts[0] - now + ONE_MINUTE_MS) / 1000;
   } else {
     lastAttempts.set(ip, [...validAttempts, now]);
     return 0;
@@ -96,22 +91,11 @@ export const ipLimiter = async (
   if (!textLimit && !imageLimit) return next();
   if (req.user?.type === "special") return next();
 
-  // Exempts Agnai.chat from IP-based rate limiting because its IPs are shared
-  // by many users. Instead, the request queue will limit the number of such
-  // requests that may wait in the queue at a time, and sorts them to the end to
-  // let individual users go first.
-  if (SHARED_IP_ADDRESSES.has(req.ip)) {
-    exemptedRequests.push(Date.now());
-    req.log.info(
-      { ip: req.ip, recentExemptions: exemptedRequests.length },
-      "Exempting Agnai request from rate limiting."
-    );
-    return next();
-  }
-
-  const type = (req.baseUrl + req.path).includes("openai-image")
-    ? "image"
-    : "text";
+  const path = req.baseUrl + req.path;
+  const type =
+    path.includes("openai-image") || path.includes("images/generations")
+      ? "image"
+      : "text";
   const limit = type === "image" ? imageLimit : textLimit;
 
   // If user is authenticated, key rate limiting by their token. Otherwise, key
@@ -123,15 +107,14 @@ export const ipLimiter = async (
   res.set("X-RateLimit-Remaining", remaining.toString());
   res.set("X-RateLimit-Reset", reset.toString());
 
-  const tryAgainInMs = getTryAgainInMs(rateLimitKey, type);
-  if (tryAgainInMs > 0) {
-    res.set("Retry-After", tryAgainInMs.toString());
+  const retryAfterTime = getRetryAfter(rateLimitKey, type);
+  if (retryAfterTime > 0) {
+    const waitSec = Math.ceil(retryAfterTime).toString();
+    res.set("Retry-After", waitSec);
     res.status(429).json({
       error: {
         type: "proxy_rate_limited",
-        message: `This model type is rate limited to ${limit} prompts per minute. Please try again in ${Math.ceil(
-          tryAgainInMs / 1000
-        )} seconds.`,
+        message: `This model type is rate limited to ${limit} prompts per minute. Please try again in ${waitSec} seconds.`,
       },
     });
   } else {

src/proxy/routes.ts

@@ -1,42 +1,55 @@
-import express, { Request, Response, NextFunction } from "express";
-import { gatekeeper } from "./gatekeeper";
-import { checkRisuToken } from "./check-risu-token";
-import { openai } from "./openai";
-import { openaiImage } from "./openai-image";
+import express from "express";
+import { addV1 } from "./add-v1";
 import { anthropic } from "./anthropic";
-import { googleAI } from "./google-ai";
-import { mistralAI } from "./mistral-ai";
 import { aws } from "./aws";
 import { azure } from "./azure";
+import { checkRisuToken } from "./check-risu-token";
+import { gatekeeper } from "./gatekeeper";
+import { gcp } from "./gcp";
+import { googleAI } from "./google-ai";
+import { mistralAI } from "./mistral-ai";
+import { openai } from "./openai";
+import { openaiImage } from "./openai-image";
 import { sendErrorToClient } from "./middleware/response/error-generator";
 
 const proxyRouter = express.Router();
+
+// Remove `expect: 100-continue` header from requests due to incompatibility
+// with node-http-proxy.
 proxyRouter.use((req, _res, next) => {
   if (req.headers.expect) {
-    // node-http-proxy does not like it when clients send `expect: 100-continue`
-    // and will stall. none of the upstream APIs use this header anyway.
     delete req.headers.expect;
   }
   next();
 });
+
+// Apply body parsers.
 proxyRouter.use(
   express.json({ limit: "100mb" }),
   express.urlencoded({ extended: true, limit: "100mb" })
 );
+
+// Apply auth/rate limits.
 proxyRouter.use(gatekeeper);
 proxyRouter.use(checkRisuToken);
+
+// Initialize request queue metadata.
 proxyRouter.use((req, _res, next) => {
   req.startTime = Date.now();
   req.retryCount = 0;
   next();
 });
+
+// Proxy endpoints.
 proxyRouter.use("/openai", addV1, openai);
 proxyRouter.use("/openai-image", addV1, openaiImage);
 proxyRouter.use("/anthropic", addV1, anthropic);
 proxyRouter.use("/google-ai", addV1, googleAI);
 proxyRouter.use("/mistral-ai", addV1, mistralAI);
-proxyRouter.use("/aws/claude", addV1, aws);
+proxyRouter.use("/aws", aws);
+proxyRouter.use("/gcp/claude", addV1, gcp);
 proxyRouter.use("/azure/openai", addV1, azure);
+
 // Redirect browser requests to the homepage.
 proxyRouter.get("*", (req, res, next) => {
   const isBrowser = req.headers["user-agent"]?.includes("Mozilla");
@@ -46,7 +59,8 @@ proxyRouter.get("*", (req, res, next) => {
     next();
   }
 });
-// Handle 404s.
+
+// Send a fake client error if user specifies an invalid proxy endpoint.
 proxyRouter.use((req, res) => {
   sendErrorToClient({
     req,
@@ -67,11 +81,3 @@ proxyRouter.use((req, res) => {
 });
 
 export { proxyRouter as proxyRouter };
-
-function addV1(req: Request, res: Response, next: NextFunction) {
-  // Clients don't consistently use the /v1 prefix so we'll add it for them.
-  if (!req.path.startsWith("/v1/")) {
-    req.url = `/v1${req.url}`;
-  }
-  next();
-}

src/server.ts

@@ -8,6 +8,7 @@ import pinoHttp from "pino-http";
 import os from "os";
 import childProcess from "child_process";
 import { logger } from "./logger";
+import { createBlacklistMiddleware } from "./shared/cidr";
 import { setupAssetsDir } from "./shared/file-storage/setup-assets-dir";
 import { keyPool } from "./shared/key-management";
 import { adminRouter } from "./admin/routes";
@@ -21,6 +22,8 @@ import { init as initUserStore } from "./shared/users/user-store";
 import { init as initTokenizers } from "./shared/tokenization";
 import { checkOrigin } from "./proxy/check-origin";
 import { sendErrorToClient } from "./proxy/middleware/response/error-generator";
+import { initializeDatabase, getDatabase } from "./shared/database";
+import { initializeFirebase } from "./shared/firebase";
 
 const PORT = config.port;
 const BIND_ADDRESS = config.bindAddress;
@@ -31,16 +34,23 @@ app.use(
   pinoHttp({
     quietReqLogger: true,
     logger,
-    autoLogging: { ignore: ({ url }) => ["/health"].includes(url as string) },
+    autoLogging: {
+      ignore: ({ url }) => {
+        const ignoreList = ["/health", "/res", "/user_content"];
+        return ignoreList.some((path) => (url as string).startsWith(path));
+      },
+    },
     redact: {
       paths: [
         "req.headers.cookie",
         'res.headers["set-cookie"]',
         "req.headers.authorization",
         'req.headers["x-api-key"]',
+        'req.headers["api-key"]',
         // Don't log the prompt text on transform errors
         "body.messages",
         "body.prompt",
+        "body.contents",
       ],
       censor: "********",
     },
@@ -62,12 +72,32 @@ app.set("views", [
 ]);
 
 app.use("/user_content", express.static(USER_ASSETS_DIR, { maxAge: "2h" }));
+app.use(
+  "/res",
+  express.static(path.join(__dirname, "..", "public"), {
+    maxAge: "2h",
+    etag: false,
+  })
+);
 
 app.get("/health", (_req, res) => res.sendStatus(200));
 app.use(cors());
+
+const blacklist = createBlacklistMiddleware("IP_BLACKLIST", config.ipBlacklist);
+app.use(blacklist);
+
 app.use(checkOrigin);
 
 app.use("/admin", adminRouter);
+app.use((req, _, next) => {
+  // For whatever reason SillyTavern just ignores the path a user provides
+  // when using Google AI with reverse proxy.  We'll fix it here.
+  if (req.path.startsWith("/v1beta/models/")) {
+    req.url = `${config.proxyEndpointRoute}/google-ai${req.url}`;
+    return next();
+  }
+  next();
+});
 app.use(config.proxyEndpointRoute, proxyRouter);
 app.use("/user", userRouter);
 if (config.staticServiceInfo) {
@@ -108,6 +138,12 @@ async function start() {
   logger.info("Checking configs and external dependencies...");
   await assertConfigIsValid();
 
+  if (config.gatekeeperStore.startsWith("firebase")) {
+    logger.info("Testing Firebase connection...");
+    await initializeFirebase();
+    logger.info("Firebase connection successful.");
+  }
+
   keyPool.init();
 
   await initTokenizers();
@@ -125,6 +161,8 @@ async function start() {
     await logQueue.start();
   }
 
+  await initializeDatabase();
+
   logger.info("Starting request queue...");
   startRequestQueue();
 
@@ -135,7 +173,7 @@ async function start() {
   app.listen(PORT, BIND_ADDRESS, () => {
     logger.info(
       { port: PORT, interface: BIND_ADDRESS },
-      "Now listening for connections."
+      "Server ready to accept connections."
     );
     registerUncaughtExceptionHandler();
   });
@@ -146,6 +184,20 @@ async function start() {
   );
 }
 
+function cleanup() {
+  console.log("Shutting down...");
+  if (config.eventLogging) {
+    try {
+      const db = getDatabase();
+      db.close();
+      console.log("Closed sqlite database.");
+    } catch (error) {}
+  }
+  process.exit(0);
+}
+
+process.on("SIGINT", cleanup);
+
 function registerUncaughtExceptionHandler() {
   process.on("uncaughtException", (err: any) => {
     logger.error(

src/service-info.ts

@@ -2,8 +2,7 @@ import { config, listConfig } from "./config";
 import {
   AnthropicKey,
   AwsBedrockKey,
-  AzureOpenAIKey,
-  GoogleAIKey,
+  GcpKey,
   keyPool,
   OpenAIKey,
 } from "./shared/key-management";
@@ -11,6 +10,7 @@ import {
   AnthropicModelFamily,
   assertIsKnownModelFamily,
   AwsBedrockModelFamily,
+  GcpModelFamily,
   AzureOpenAIModelFamily,
   GoogleAIModelFamily,
   LLM_SERVICES,
@@ -24,22 +24,16 @@ import { getCostSuffix, getTokenCostUsd, prettyTokens } from "./shared/stats";
 import { getUniqueIps } from "./proxy/rate-limit";
 import { assertNever } from "./shared/utils";
 import { getEstimatedWaitTime, getQueueLength } from "./proxy/queue";
-import { MistralAIKey } from "./shared/key-management/mistral-ai/provider";
 
 const CACHE_TTL = 2000;
 
 type KeyPoolKey = ReturnType<typeof keyPool.list>[0];
 const keyIsOpenAIKey = (k: KeyPoolKey): k is OpenAIKey =>
   k.service === "openai";
-const keyIsAzureKey = (k: KeyPoolKey): k is AzureOpenAIKey =>
-  k.service === "azure";
 const keyIsAnthropicKey = (k: KeyPoolKey): k is AnthropicKey =>
   k.service === "anthropic";
-const keyIsGoogleAIKey = (k: KeyPoolKey): k is GoogleAIKey =>
-  k.service === "google-ai";
-const keyIsMistralAIKey = (k: KeyPoolKey): k is MistralAIKey =>
-  k.service === "mistral-ai";
 const keyIsAwsKey = (k: KeyPoolKey): k is AwsBedrockKey => k.service === "aws";
+const keyIsGcpKey = (k: KeyPoolKey): k is GcpKey => k.service === "gcp";
 
 /** Stats aggregated across all keys for a given service. */
 type ServiceAggregate = "keys" | "uncheckedKeys" | "orgs";
@@ -51,10 +45,15 @@ type ModelAggregates = {
   overQuota?: number;
   pozzed?: number;
   awsLogged?: number;
-  awsSonnet?: number;
-  awsHaiku?: number;
+  // needed to disambugiate aws-claude family's variants
+  awsClaude2?: number;
+  awsSonnet3?: number;
+  awsSonnet3_5?: number;
+  awsHaiku: number;
+  gcpSonnet?: number;
+  gcpSonnet35?: number;
+  gcpHaiku?: number;
   queued: number;
-  queueTime: string;
   tokens: number;
 };
 /** All possible combinations of model family and aggregate type. */
@@ -80,13 +79,16 @@ type OpenAIInfo = BaseFamilyInfo & {
   overQuotaKeys?: number;
 };
 type AnthropicInfo = BaseFamilyInfo & {
+  trialKeys?: number;
   prefilledKeys?: number;
   overQuotaKeys?: number;
 };
 type AwsInfo = BaseFamilyInfo & {
   privacy?: string;
-  sonnetKeys?: number;
-  haikuKeys?: number;
+  enabledVariants?: string;
+};
+type GcpInfo = BaseFamilyInfo & {
+  enabledVariants?: string;
 };
 
 // prettier-ignore
@@ -94,12 +96,11 @@ export type ServiceInfo = {
   uptime: number;
   endpoints: {
     openai?: string;
-    openai2?: string;
     anthropic?: string;
-    "anthropic-claude-3"?: string;
     "google-ai"?: string;
     "mistral-ai"?: string;
-    aws?: string;
+    "aws"?: string;
+    gcp?: string;
     azure?: string;
     "openai-image"?: string;
     "azure-image"?: string;
@@ -113,6 +114,7 @@ export type ServiceInfo = {
 } & { [f in OpenAIModelFamily]?: OpenAIInfo }
   & { [f in AnthropicModelFamily]?: AnthropicInfo; }
   & { [f in AwsBedrockModelFamily]?: AwsInfo }
+  & { [f in GcpModelFamily]?: GcpInfo }
   & { [f in AzureOpenAIModelFamily]?: BaseFamilyInfo; }
   & { [f in GoogleAIModelFamily]?: BaseFamilyInfo }
   & { [f in MistralAIModelFamily]?: BaseFamilyInfo };
@@ -135,13 +137,10 @@ export type ServiceInfo = {
 const SERVICE_ENDPOINTS: { [s in LLMService]: Record<string, string> } = {
   openai: {
     openai: `%BASE%/openai`,
-    openai2: `%BASE%/openai/turbo-instruct`,
     "openai-image": `%BASE%/openai-image`,
   },
   anthropic: {
     anthropic: `%BASE%/anthropic`,
-    "anthropic-sonnet (⚠️Temporary: for Claude 3 Sonnet)": `%BASE%/anthropic/sonnet`,
-    "anthropic-opus (⚠️Temporary: for Claude 3 Opus)": `%BASE%/anthropic/opus`,
   },
   "google-ai": {
     "google-ai": `%BASE%/google-ai`,
@@ -150,8 +149,11 @@ const SERVICE_ENDPOINTS: { [s in LLMService]: Record<string, string> } = {
     "mistral-ai": `%BASE%/mistral-ai`,
   },
   aws: {
-    aws: `%BASE%/aws/claude`,
-    "aws-sonnet (⚠️Temporary: for AWS Claude 3 Sonnet)": `%BASE%/aws/claude/sonnet`,
+    "aws-claude": `%BASE%/aws/claude`,
+    "aws-mistral": `%BASE%/aws/mistral`,
+  },
+  gcp: {
+    gcp: `%BASE%/gcp/claude`,
   },
   azure: {
     azure: `%BASE%/azure/openai`,
@@ -159,7 +161,7 @@ const SERVICE_ENDPOINTS: { [s in LLMService]: Record<string, string> } = {
   },
 };
 
-const modelStats = new Map<ModelAggregateKey, number>();
+const familyStats = new Map<ModelAggregateKey, number>();
 const serviceStats = new Map<keyof AllStats, number>();
 
 let cachedInfo: ServiceInfo | undefined;
@@ -176,7 +178,7 @@ export function buildInfo(baseUrl: string, forAdmin = false): ServiceInfo {
       .concat("turbo")
   );
 
-  modelStats.clear();
+  familyStats.clear();
   serviceStats.clear();
   keys.forEach(addKeyToAggregates);
 
@@ -211,7 +213,8 @@ export function buildInfo(baseUrl: string, forAdmin = false): ServiceInfo {
 }
 
 function getStatus() {
-  if (!config.checkKeys) return "Key checking is disabled.";
+  if (!config.checkKeys)
+    return "Key checking is disabled. The data displayed are not reliable.";
 
   let unchecked = 0;
   for (const service of LLM_SERVICES) {
@@ -294,129 +297,102 @@ function increment<T extends keyof AllStats | ModelAggregateKey>(
 ) {
   map.set(key, (map.get(key) || 0) + delta);
 }
+const addToService = increment.bind(null, serviceStats);
+const addToFamily = increment.bind(null, familyStats);
 
 function addKeyToAggregates(k: KeyPoolKey) {
-  increment(serviceStats, "proompts", k.promptCount);
-  increment(serviceStats, "openai__keys", k.service === "openai" ? 1 : 0);
-  increment(serviceStats, "anthropic__keys", k.service === "anthropic" ? 1 : 0);
-  increment(serviceStats, "google-ai__keys", k.service === "google-ai" ? 1 : 0);
-  increment(
-    serviceStats,
-    "mistral-ai__keys",
-    k.service === "mistral-ai" ? 1 : 0
-  );
-  increment(serviceStats, "aws__keys", k.service === "aws" ? 1 : 0);
-  increment(serviceStats, "azure__keys", k.service === "azure" ? 1 : 0);
+  addToService("proompts", k.promptCount);
+  addToService("openai__keys", k.service === "openai" ? 1 : 0);
+  addToService("anthropic__keys", k.service === "anthropic" ? 1 : 0);
+  addToService("google-ai__keys", k.service === "google-ai" ? 1 : 0);
+  addToService("mistral-ai__keys", k.service === "mistral-ai" ? 1 : 0);
+  addToService("aws__keys", k.service === "aws" ? 1 : 0);
+  addToService("gcp__keys", k.service === "gcp" ? 1 : 0);
+  addToService("azure__keys", k.service === "azure" ? 1 : 0);
 
   let sumTokens = 0;
   let sumCost = 0;
 
+  const incrementGenericFamilyStats = (f: ModelFamily) => {
+    const tokens = (k as any)[`${f}Tokens`];
+    sumTokens += tokens;
+    sumCost += getTokenCostUsd(f, tokens);
+    addToFamily(`${f}__tokens`, tokens);
+    addToFamily(`${f}__revoked`, k.isRevoked ? 1 : 0);
+    addToFamily(`${f}__active`, k.isDisabled ? 0 : 1);
+  };
+
   switch (k.service) {
     case "openai":
       if (!keyIsOpenAIKey(k)) throw new Error("Invalid key type");
-      increment(
-        serviceStats,
-        "openai__uncheckedKeys",
-        Boolean(k.lastChecked) ? 0 : 1
-      );
-
+      addToService("openai__uncheckedKeys", Boolean(k.lastChecked) ? 0 : 1);
       k.modelFamilies.forEach((f) => {
-        const tokens = k[`${f}Tokens`];
-        sumTokens += tokens;
-        sumCost += getTokenCostUsd(f, tokens);
-        increment(modelStats, `${f}__tokens`, tokens);
-        increment(modelStats, `${f}__revoked`, k.isRevoked ? 1 : 0);
-        increment(modelStats, `${f}__active`, k.isDisabled ? 0 : 1);
-        increment(modelStats, `${f}__trial`, k.isTrial ? 1 : 0);
-        increment(modelStats, `${f}__overQuota`, k.isOverQuota ? 1 : 0);
+        incrementGenericFamilyStats(f);
+        addToFamily(`${f}__trial`, k.isTrial ? 1 : 0);
+        addToFamily(`${f}__overQuota`, k.isOverQuota ? 1 : 0);
       });
       break;
-    case "azure":
-      if (!keyIsAzureKey(k)) throw new Error("Invalid key type");
-      k.modelFamilies.forEach((f) => {
-        const tokens = k[`${f}Tokens`];
-        sumTokens += tokens;
-        sumCost += getTokenCostUsd(f, tokens);
-        increment(modelStats, `${f}__tokens`, tokens);
-        increment(modelStats, `${f}__active`, k.isDisabled ? 0 : 1);
-        increment(modelStats, `${f}__revoked`, k.isRevoked ? 1 : 0);
-      });
-      break;
-    case "anthropic": {
+    case "anthropic":
       if (!keyIsAnthropicKey(k)) throw new Error("Invalid key type");
+      addToService("anthropic__uncheckedKeys", Boolean(k.lastChecked) ? 0 : 1);
       k.modelFamilies.forEach((f) => {
-        const tokens = k[`${f}Tokens`];
-        sumTokens += tokens;
-        sumCost += getTokenCostUsd(f, tokens);
-        increment(modelStats, `${f}__tokens`, tokens);
-        increment(modelStats, `${f}__revoked`, k.isRevoked ? 1 : 0);
-        increment(modelStats, `${f}__active`, k.isDisabled ? 0 : 1);
-        increment(modelStats, `${f}__overQuota`, k.isOverQuota ? 1 : 0);
-        increment(modelStats, `${f}__pozzed`, k.isPozzed ? 1 : 0);
-      });
-      increment(
-        serviceStats,
-        "anthropic__uncheckedKeys",
-        Boolean(k.lastChecked) ? 0 : 1
-      );
-      break;
-    }
-    case "google-ai": {
-      if (!keyIsGoogleAIKey(k)) throw new Error("Invalid key type");
-      const family = "gemini-pro";
-      sumTokens += k["gemini-proTokens"];
-      sumCost += getTokenCostUsd(family, k["gemini-proTokens"]);
-      increment(modelStats, `${family}__active`, k.isDisabled ? 0 : 1);
-      increment(modelStats, `${family}__revoked`, k.isRevoked ? 1 : 0);
-      increment(modelStats, `${family}__tokens`, k["gemini-proTokens"]);
-      break;
-    }
-    case "mistral-ai": {
-      if (!keyIsMistralAIKey(k)) throw new Error("Invalid key type");
-      k.modelFamilies.forEach((f) => {
-        const tokens = k[`${f}Tokens`];
-        sumTokens += tokens;
-        sumCost += getTokenCostUsd(f, tokens);
-        increment(modelStats, `${f}__tokens`, tokens);
-        increment(modelStats, `${f}__revoked`, k.isRevoked ? 1 : 0);
-        increment(modelStats, `${f}__active`, k.isDisabled ? 0 : 1);
+        incrementGenericFamilyStats(f);
+        addToFamily(`${f}__trial`, k.tier === "free" ? 1 : 0);
+        addToFamily(`${f}__overQuota`, k.isOverQuota ? 1 : 0);
+        addToFamily(`${f}__pozzed`, k.isPozzed ? 1 : 0);
       });
       break;
-    }
+
     case "aws": {
       if (!keyIsAwsKey(k)) throw new Error("Invalid key type");
-      const family = "aws-claude";
-      sumTokens += k["aws-claudeTokens"];
-      sumCost += getTokenCostUsd(family, k["aws-claudeTokens"]);
-      increment(modelStats, `${family}__active`, k.isDisabled ? 0 : 1);
-      increment(modelStats, `${family}__revoked`, k.isRevoked ? 1 : 0);
-      increment(modelStats, `${family}__tokens`, k["aws-claudeTokens"]);
-      increment(modelStats, `${family}__awsSonnet`, k.sonnetEnabled ? 1 : 0);
-      increment(modelStats, `${family}__awsHaiku`, k.haikuEnabled ? 1 : 0);
-
+      k.modelFamilies.forEach(incrementGenericFamilyStats);
+      if (!k.isDisabled) {
+        // Don't add revoked keys to available AWS variants
+        k.modelIds.forEach((id) => {
+          if (id.includes("claude-3-sonnet")) {
+            addToFamily(`aws-claude__awsSonnet3`, 1);
+          } else if (id.includes("claude-3-5-sonnet")) {
+            addToFamily(`aws-claude__awsSonnet3_5`, 1);
+          } else if (id.includes("claude-3-haiku")) {
+            addToFamily(`aws-claude__awsHaiku`, 1);
+          } else if (id.includes("claude-v2")) {
+            addToFamily(`aws-claude__awsClaude2`, 1);
+          }
+        });
+      }
       // Ignore revoked keys for aws logging stats, but include keys where the
       // logging status is unknown.
       const countAsLogged =
-        k.lastChecked && !k.isDisabled && k.awsLoggingStatus !== "disabled";
-      increment(modelStats, `${family}__awsLogged`, countAsLogged ? 1 : 0);
-
+        k.lastChecked && !k.isDisabled && k.awsLoggingStatus === "enabled";
+      addToFamily(`aws-claude__awsLogged`, countAsLogged ? 1 : 0);
       break;
     }
+    case "gcp":
+      if (!keyIsGcpKey(k)) throw new Error("Invalid key type");
+      k.modelFamilies.forEach(incrementGenericFamilyStats);
+      // TODO: add modelIds to GcpKey
+      break;
+    // These services don't have any additional stats to track.
+    case "azure":
+    case "google-ai":
+    case "mistral-ai":
+      k.modelFamilies.forEach(incrementGenericFamilyStats);
+      break;
     default:
       assertNever(k.service);
   }
 
-  increment(serviceStats, "tokens", sumTokens);
-  increment(serviceStats, "tokenCost", sumCost);
+  addToService("tokens", sumTokens);
+  addToService("tokenCost", sumCost);
 }
 
 function getInfoForFamily(family: ModelFamily): BaseFamilyInfo {
-  const tokens = modelStats.get(`${family}__tokens`) || 0;
+  const tokens = familyStats.get(`${family}__tokens`) || 0;
   const cost = getTokenCostUsd(family, tokens);
-  let info: BaseFamilyInfo & OpenAIInfo & AnthropicInfo & AwsInfo = {
+  let info: BaseFamilyInfo & OpenAIInfo & AnthropicInfo & AwsInfo & GcpInfo = {
     usage: `${prettyTokens(tokens)} tokens${getCostSuffix(cost)}`,
-    activeKeys: modelStats.get(`${family}__active`) || 0,
-    revokedKeys: modelStats.get(`${family}__revoked`) || 0,
+    activeKeys: familyStats.get(`${family}__active`) || 0,
+    revokedKeys: familyStats.get(`${family}__revoked`) || 0,
   };
 
   // Add service-specific stats to the info object.
@@ -424,8 +400,8 @@ function getInfoForFamily(family: ModelFamily): BaseFamilyInfo {
     const service = MODEL_FAMILY_SERVICE[family];
     switch (service) {
       case "openai":
-        info.overQuotaKeys = modelStats.get(`${family}__overQuota`) || 0;
-        info.trialKeys = modelStats.get(`${family}__trial`) || 0;
+        info.overQuotaKeys = familyStats.get(`${family}__overQuota`) || 0;
+        info.trialKeys = familyStats.get(`${family}__trial`) || 0;
 
         // Delete trial/revoked keys for non-turbo families.
         // Trials are turbo 99% of the time, and if a key is invalid we don't
@@ -436,17 +412,36 @@ function getInfoForFamily(family: ModelFamily): BaseFamilyInfo {
         }
         break;
       case "anthropic":
-        info.overQuotaKeys = modelStats.get(`${family}__overQuota`) || 0;
-        info.prefilledKeys = modelStats.get(`${family}__pozzed`) || 0;
+        info.overQuotaKeys = familyStats.get(`${family}__overQuota`) || 0;
+        info.trialKeys = familyStats.get(`${family}__trial`) || 0;
+        info.prefilledKeys = familyStats.get(`${family}__pozzed`) || 0;
         break;
       case "aws":
-        info.sonnetKeys = modelStats.get(`${family}__awsSonnet`) || 0;
-        info.haikuKeys = modelStats.get(`${family}__awsHaiku`) || 0;
-        const logged = modelStats.get(`${family}__awsLogged`) || 0;
-        if (logged > 0) {
-          info.privacy = config.allowAwsLogging
-            ? `${logged} active keys are potentially logged.`
-            : `${logged} active keys are potentially logged and can't be used. Set ALLOW_AWS_LOGGING=true to override.`;
+        if (family === "aws-claude") {
+          const logged = familyStats.get(`${family}__awsLogged`) || 0;
+          const variants = new Set<string>();
+          if (familyStats.get(`${family}__awsClaude2`) || 0)
+            variants.add("claude2");
+          if (familyStats.get(`${family}__awsSonnet3`) || 0)
+            variants.add("sonnet3");
+          if (familyStats.get(`${family}__awsSonnet3_5`) || 0)
+            variants.add("sonnet3.5");
+          if (familyStats.get(`${family}__awsHaiku`) || 0)
+            variants.add("haiku");
+          info.enabledVariants = variants.size
+            ? `${Array.from(variants).join(",")}`
+            : undefined;
+          if (logged > 0) {
+            info.privacy = config.allowAwsLogging
+              ? `AWS logging verification inactive. Prompts could be logged.`
+              : `${logged} active keys are potentially logged and can't be used. Set ALLOW_AWS_LOGGING=true to override.`;
+          }
+        }
+        break;
+      case "gcp":
+        if (family === "gcp-claude") {
+          // TODO: implement
+          info.enabledVariants = "not implemented";
         }
         break;
     }

src/shared/api-schemas/anthropic.ts

@@ -63,7 +63,12 @@ export const AnthropicV1MessagesSchema = AnthropicV1BaseSchema.merge(
       .number()
       .int()
       .transform((v) => Math.min(v, CLAUDE_OUTPUT_MAX)),
-    system: z.string().optional(),
+    system: z
+      .union([
+        z.string(),
+        z.array(z.object({ type: z.literal("text"), text: z.string() })),
+      ])
+      .optional(),
   })
 );
 export type AnthropicChatMessage = z.infer<
@@ -77,7 +82,7 @@ function openAIMessagesToClaudeTextPrompt(messages: OpenAIChatMessage[]) {
         let role: string = m.role;
         if (role === "assistant") {
           role = "Assistant";
-        } else if (role === "system") {
+        } else if (["system", "developer"].includes(role)) {
           role = "System";
         } else if (role === "user") {
           role = "Human";
@@ -105,8 +110,6 @@ export const transformOpenAIToAnthropicChat: APIFormatTransformer<
     throw result.error;
   }
 
-  req.headers["anthropic-version"] = "2023-06-01";
-
   const { messages, ...rest } = result.data;
   const { messages: newMessages, system } =
     openAIMessagesToClaudeChatPrompt(messages);
@@ -119,7 +122,8 @@ export const transformOpenAIToAnthropicChat: APIFormatTransformer<
     stream: rest.stream,
     temperature: rest.temperature,
     top_p: rest.top_p,
-    stop_sequences: typeof rest.stop === "string" ? [rest.stop] : rest.stop,
+    stop_sequences:
+      typeof rest.stop === "string" ? [rest.stop] : rest.stop || undefined,
     ...(rest.user ? { metadata: { user_id: rest.user } } : {}),
     // Anthropic supports top_k, but OpenAI does not
     // OpenAI supports frequency_penalty, presence_penalty, logit_bias, n, seed,
@@ -140,8 +144,6 @@ export const transformOpenAIToAnthropicText: APIFormatTransformer<
     throw result.error;
   }
 
-  req.headers["anthropic-version"] = "2023-06-01";
-
   const { messages, ...rest } = result.data;
   const prompt = openAIMessagesToClaudeTextPrompt(messages);
 
@@ -186,8 +188,6 @@ export const transformAnthropicTextToAnthropicChat: APIFormatTransformer<
     throw result.error;
   }
 
-  req.headers["anthropic-version"] = "2023-06-01";
-
   const { model, max_tokens_to_sample, prompt, ...rest } = result.data;
   validateAnthropicTextPrompt(prompt);
 
@@ -260,7 +260,7 @@ export function flattenAnthropicMessages(
 ): string {
   return messages
     .map((msg) => {
-      const name = msg.role === "user" ? "\n\nHuman: " : "\n\nAssistant: ";
+      const name = msg.role === "user" ? "Human" : "Assistant";
       const parts = Array.isArray(msg.content)
         ? msg.content
         : [{ type: "text", text: msg.content }];
@@ -365,7 +365,7 @@ function openAIMessagesToClaudeChatPrompt(messages: OpenAIChatMessage[]): {
     // Here we will lose the original name if it was a system message, but that
     // is generally okay because the system message is usually a prompt and not
     // a character in the chat.
-    const name = msg.role === "system" ? "System" : msg.name?.trim();
+    const name = ["system", "developer"].includes(msg.role) ? "System" : msg.name?.trim();
     const content = convertOpenAIContent(msg.content);
 
     // Prepend the display name to the first text content in the current message
@@ -395,8 +395,8 @@ function openAIMessagesToClaudeChatPrompt(messages: OpenAIChatMessage[]): {
 
 function isSystemOpenAIRole(
   role: OpenAIChatMessage["role"]
-): role is "system" | "function" | "tool" {
-  return ["system", "function", "tool"].includes(role);
+): role is "developer" | "system" | "function" | "tool" {
+  return ["developer","system", "function", "tool"].includes(role);
 }
 
 function getFirstTextContent(content: OpenAIChatMessage["content"]) {
@@ -438,3 +438,10 @@ function convertOpenAIContent(
     }
   });
 }
+
+export function containsImageContent(messages: AnthropicChatMessage[]) {
+  return messages.some(
+    ({ content }) =>
+      typeof content !== "string" && content.some((c) => c.type === "image")
+  );
+}

src/shared/api-schemas/google-ai.ts

@@ -5,32 +5,69 @@ import {
 } from "./openai";
 import { APIFormatTransformer } from "./index";
 
+const GoogleAIV1ContentSchema = z.object({
+  parts: z
+    .union([
+      z.array(z.object({ text: z.string() })),
+      z.object({ text: z.string() }),
+    ])
+    // Google allows parts to be an array or a single object, which is really
+    // annoying for downstream code. We will coerce it to an array here.
+    .transform((val) => (Array.isArray(val) ? val : [val])),
+  // TODO: add other media types
+  role: z.enum(["user", "model"]).optional(),
+});
+
+const SafetySettingsSchema = z
+  .array(
+    z.object({
+      category: z.enum([
+        "HARM_CATEGORY_HARASSMENT",
+        "HARM_CATEGORY_HATE_SPEECH",
+        "HARM_CATEGORY_SEXUALLY_EXPLICIT",
+        "HARM_CATEGORY_DANGEROUS_CONTENT",
+        "HARM_CATEGORY_CIVIC_INTEGRITY",
+      ]),
+      threshold: z.enum([
+        "OFF",
+        "BLOCK_NONE",
+        "BLOCK_ONLY_HIGH",
+        "BLOCK_MEDIUM_AND_ABOVE",
+        "BLOCK_LOW_AND_ABOVE",
+        "HARM_BLOCK_THRESHOLD_UNSPECIFIED",
+      ]),
+    })
+  )
+  .optional();
+
 // https://developers.generativeai.google/api/rest/generativelanguage/models/generateContent
 export const GoogleAIV1GenerateContentSchema = z
   .object({
     model: z.string().max(100), //actually specified in path but we need it for the router
     stream: z.boolean().optional().default(false), // also used for router
-    contents: z.array(
-      z.object({
-        parts: z.array(z.object({ text: z.string() })),
-        role: z.enum(["user", "model"]),
-      })
-    ),
+    contents: z.array(GoogleAIV1ContentSchema),
     tools: z.array(z.object({})).max(0).optional(),
-    safetySettings: z.array(z.object({})).max(0).optional(),
-    generationConfig: z.object({
-      temperature: z.number().optional(),
-      maxOutputTokens: z.coerce
-        .number()
-        .int()
-        .optional()
-        .default(16)
-        .transform((v) => Math.min(v, 1024)), // TODO: Add config
-      candidateCount: z.literal(1).optional(),
-      topP: z.number().optional(),
-      topK: z.number().optional(),
-      stopSequences: z.array(z.string().max(500)).max(5).optional(),
-    }),
+    safetySettings: SafetySettingsSchema,
+    systemInstruction: GoogleAIV1ContentSchema.optional(),
+    // quick fix for SillyTavern, which uses camel case field names for everything
+    // except for system_instruction where it randomly uses snake case.
+    // google api evidently accepts either case.
+    system_instruction: GoogleAIV1ContentSchema.optional(),
+    generationConfig: z
+      .object({
+        temperature: z.number().min(0).max(2).optional(),
+        maxOutputTokens: z.coerce
+          .number()
+          .int()
+          .optional()
+          .default(16)
+          .transform((v) => Math.min(v, 4096)), // TODO: Add config
+        candidateCount: z.literal(1).optional(),
+        topP: z.number().min(0).max(1).optional(),
+        topK: z.number().min(1).max(40).optional(),
+        stopSequences: z.array(z.string().max(500)).max(5).optional(),
+      })
+      .default({}),
   })
   .strip();
 export type GoogleAIChatMessage = z.infer<
@@ -103,7 +140,7 @@ export const transformOpenAIToGoogleAI: APIFormatTransformer<
   stops = [...new Set(stops)].slice(0, 5);
 
   return {
-    model: "gemini-pro",
+    model: req.body.model,
     stream: rest.stream,
     contents,
     tools: [],
@@ -119,6 +156,7 @@ export const transformOpenAIToGoogleAI: APIFormatTransformer<
       { category: "HARM_CATEGORY_HATE_SPEECH", threshold: "BLOCK_NONE" },
       { category: "HARM_CATEGORY_SEXUALLY_EXPLICIT", threshold: "BLOCK_NONE" },
       { category: "HARM_CATEGORY_DANGEROUS_CONTENT", threshold: "BLOCK_NONE" },
+      { category: "HARM_CATEGORY_CIVIC_INTEGRITY", threshold: "BLOCK_NONE" },
     ],
   };
 };

src/shared/api-schemas/index.ts

@@ -21,7 +21,11 @@ import {
   GoogleAIV1GenerateContentSchema,
   transformOpenAIToGoogleAI,
 } from "./google-ai";
-import { MistralAIV1ChatCompletionsSchema } from "./mistral-ai";
+import {
+  MistralAIV1ChatCompletionsSchema,
+  MistralAIV1TextCompletionsSchema,
+  transformMistralChatToText,
+} from "./mistral-ai";
 
 export { OpenAIChatMessage } from "./openai";
 export {
@@ -49,6 +53,7 @@ export const API_REQUEST_TRANSFORMERS: TransformerMap = {
   "openai->openai-text": transformOpenAIToOpenAIText,
   "openai->openai-image": transformOpenAIToOpenAIImage,
   "openai->google-ai": transformOpenAIToGoogleAI,
+  "mistral-ai->mistral-text": transformMistralChatToText,
 };
 
 export const API_REQUEST_VALIDATORS: Record<APIFormat, z.ZodSchema<any>> = {
@@ -59,4 +64,5 @@ export const API_REQUEST_VALIDATORS: Record<APIFormat, z.ZodSchema<any>> = {
   "openai-image": OpenAIV1ImagesGenerationSchema,
   "google-ai": GoogleAIV1GenerateContentSchema,
   "mistral-ai": MistralAIV1ChatCompletionsSchema,
+  "mistral-text": MistralAIV1TextCompletionsSchema,
 };