wip

This reverts commit 4ffa7fb12b.

.env.example

@@ -5,12 +5,18 @@
 # All values have reasonable defaults, so you only need to change the ones you
 # want to override.
 
+# Use production mode unless you are developing locally.
+NODE_ENV=production
+
 # ------------------------------------------------------------------------------
 # General settings:
 
 # The title displayed on the info page.
 # SERVER_TITLE=Coom Tunnel
 
+# The route name used to proxy requests to APIs, relative to the Web site root.
+# PROXY_ENDPOINT_ROUTE=/proxy
+
 # Text model requests allowed per minute per user.
 # TEXT_MODEL_RATE_LIMIT=4
 # Image model requests allowed per minute per user.
@@ -34,10 +40,11 @@
 
 # Which model types users are allowed to access.
 # The following model families are recognized:
-# turbo | gpt4 | gpt4-32k | gpt4-turbo | dall-e | claude | bison | aws-claude | azure-turbo | azure-gpt4 | azure-gpt4-32k | azure-gpt4-turbo
+# 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'. To allow DALL-E image
+# By default, all models are allowed except for 'dall-e' / 'azure-dall-e'.
-# generation, uncomment the line below and add 'dall-e' to the list.
+# To allow DALL-E image generation, uncomment the line below and add 'dall-e' or
-# ALLOWED_MODEL_FAMILIES=turbo,gpt4,gpt4-32k,gpt4-turbo,claude,bison,aws-claude,azure-turbo,azure-gpt4,azure-gpt4-32k,azure-gpt4-turbo
+# '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
 
 # URLs from which requests will be blocked.
 # BLOCKED_ORIGINS=reddit.com,9gag.com
@@ -57,8 +64,9 @@
 # Requires additional setup. See `docs/google-sheets.md` for more information.
 # PROMPT_LOGGING=false
 
-# The port to listen on.
+# 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
@@ -95,17 +103,23 @@
 # TOKEN_QUOTA_GPT4_TURBO=0
 # TOKEN_QUOTA_DALL_E=0
 # TOKEN_QUOTA_CLAUDE=0
-# TOKEN_QUOTA_BISON=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
+
 # ------------------------------------------------------------------------------
 # Secrets and keys:
-# Do not put any passwords or API keys directly in this file.
+# For Huggingface, set them via the Secrets section in your Space's config UI. Dp not set them in .env.
-# For Huggingface, set them via the Secrets section in your Space's config UI.
 # For Render, create a "secret file" called .env using the Environment tab.
 
 # You can add multiple API keys by separating them with a comma.

.gitignore

@@ -1,8 +1,11 @@
-.env
+.aider*
+.env*
+!.env.vault
 .venv
 .vscode
 .idea
 build
 greeting.md
 node_modules
+
 http-client.private.env.json

README.md

@@ -1,34 +1,53 @@
 # OAI Reverse Proxy
 
-Reverse proxy server for the OpenAI and Anthropic APIs. Forwards text generation requests while rejecting administrative/billing requests. Includes optional rate limiting and prompt filtering to prevent abuse.
+Reverse proxy server for various LLM APIs.
 
 ### Table of Contents
 - [What is this?](#what-is-this)
-- [Why?](#why)
+- [Features](#features)
-- [Usage Instructions](#setup-instructions)
+- [Usage Instructions](#usage-instructions)
-  - [Deploy to Huggingface (Recommended)](#deploy-to-huggingface-recommended)
+  - [Self-hosting](#self-hosting)
-  - [Deploy to Repl.it (WIP)](#deploy-to-replit-wip)
+  - [Alternatives](#alternatives)
+    - [Huggingface (outdated, not advised)](#huggingface-outdated-not-advised)
+    - [Render (outdated, not advised)](#render-outdated-not-advised)
 - [Local Development](#local-development)
 
 ## What is this?
-If you would like to provide a friend access to an API via keys you own, you can use this to keep your keys safe while still allowing them to generate text with the API. You can also use this if you'd like to build a client-side application which uses the OpenAI or Anthropic APIs, but don't want to build your own backend. You should never embed your real API keys in a client-side application. Instead, you can have your frontend connect to this reverse proxy and forward requests to the downstream service.
+This project allows you to run a reverse proxy server for various LLM APIs.
 
-This keeps your keys safe and allows you to use the rate limiting and prompt filtering features of the proxy to prevent abuse.
+## Features
-
+- [x] Support for multiple APIs
-## Why?
+  - [x] [OpenAI](https://openai.com/)
-OpenAI keys have full account permissions. They can revoke themselves, generate new keys, modify spend quotas, etc. **You absolutely should not share them, post them publicly, nor embed them in client-side applications as they can be easily stolen.**
+  - [x] [Anthropic](https://www.anthropic.com/)
-
+  - [x] [AWS Bedrock](https://aws.amazon.com/bedrock/)
-This proxy only forwards text generation requests to the downstream service and rejects requests which would otherwise modify your account. 
+  - [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
+- [x] Multiple API keys with rotation and rate limit handling
+- [x] Basic user management
+  - [x] Simple role-based permissions
+  - [x] Per-model token quotas
+  - [x] Temporary user accounts
+- [x] Prompt and completion logging
+- [x] Abuse detection and prevention
 
 ---
 
 ## Usage Instructions
-If you'd like to run your own instance of this proxy, 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'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.
 
-### Deploy to Huggingface (Recommended)
+### Self-hosting
+[See here for instructions on how to self-host the application on your own VPS or local machine.](./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)
 
-### Deploy to Render
+### Render (outdated, not advised)
 [See here for instructions on how to deploy to Render.com.](./docs/deploy-render.md)
 
 ## Local Development
@@ -40,3 +59,12 @@ To run the proxy locally for development or testing, install Node.js >= 18.0.0 a
 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.
+
+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/ci/.gitlab-ci.yml

@@ -0,0 +1,21 @@
+stages:
+  - build
+
+build_image:
+  stage: build
+  image:
+    name: gcr.io/kaniko-project/executor:debug
+    entrypoint: [""]
+  script:
+    - |
+      if [ "$CI_COMMIT_REF_NAME" = "main" ]; then
+        TAG="latest"
+      else
+        TAG=$CI_COMMIT_REF_NAME
+      fi
+    - echo "Building image with tag $TAG"
+    - BASE64_AUTH=$(echo -n "$DOCKER_HUB_USERNAME:$DOCKER_HUB_ACCESS_TOKEN" | base64)
+    - echo "{\"auths\":{\"https://index.docker.io/v1/\":{\"auth\":\"$BASE64_AUTH\"}}}" > /kaniko/.docker/config.json
+    - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/docker/ci/Dockerfile --destination docker.io/khanonci/oai-reverse-proxy:$TAG --build-arg CI_COMMIT_REF_NAME=$CI_COMMIT_REF_NAME --build-arg CI_COMMIT_SHA=$CI_COMMIT_SHA --build-arg CI_PROJECT_PATH=$CI_PROJECT_PATH
+  only:
+    - main

docker/ci/Dockerfile

@@ -0,0 +1,22 @@
+FROM node:18-bullseye-slim
+
+WORKDIR /app
+COPY . .
+
+RUN npm ci
+RUN npm run build
+RUN npm prune --production
+
+EXPOSE 7860
+ENV PORT=7860
+ENV NODE_ENV=production
+
+ARG CI_COMMIT_REF_NAME
+ARG CI_COMMIT_SHA
+ARG CI_PROJECT_PATH
+
+ENV GITGUD_BRANCH=$CI_COMMIT_REF_NAME
+ENV GITGUD_COMMIT=$CI_COMMIT_SHA
+ENV GITGUD_PROJECT=$CI_PROJECT_PATH
+
+CMD [ "npm", "start" ]

docker/docker-compose-selfhost.yml

@@ -0,0 +1,17 @@
+# Before running this, create a .env and greeting.md file.
+# Refer to .env.example for the required environment variables.
+# User-generated content is stored in the data directory.
+# When self-hosting, it's recommended to run this behind a reverse proxy like
+# nginx or Caddy to handle SSL/TLS and rate limiting. Refer to
+# docs/self-hosting.md for more information and an example nginx config.
+version: '3.8'
+services:
+  oai-reverse-proxy:
+    image: khanonci/oai-reverse-proxy:latest
+    ports:
+      - "127.0.0.1:7860:7860"
+    env_file:
+      - ./.env
+    volumes:
+      - ./greeting.md:/app/greeting.md
+      - ./data:/app/data

docker/huggingface/Dockerfile

@@ -10,4 +10,6 @@ COPY Dockerfile greeting.md* .env* ./
 RUN npm run build
 EXPOSE 7860
 ENV NODE_ENV=production
+# Huggigface free VMs have 16GB of RAM so we can be greedy
+ENV NODE_OPTIONS="--max-old-space-size=12882"
 CMD [ "npm", "start" ]

docs/aws-configuration.md

@@ -45,7 +45,7 @@ You can also request Claude Instant, but support for this isn't fully implemente
 ### Supported model IDs
 Users can send these model IDs to the proxy to invoke the corresponding models.
 - **Claude**
-  - `anthropic.claude-v1` (~18k context, claude 1.3)
+  - `anthropic.claude-v1` (~18k context, claude 1.3 -- EOL 2024-02-28)
   - `anthropic.claude-v2` (~100k context, claude 2.0)
   - `anthropic.claude-v2:1` (~200k context, claude 2.1)
 - **Claude Instant**

docs/dall-e-configuration.md

@@ -35,7 +35,7 @@ Add `dall-e` to the `ALLOWED_MODEL_FAMILIES` environment variable to enable DALL
 ALLOWED_MODEL_FAMILIES=turbo,gpt-4,gpt-4turbo,dall-e
 
 # All models as of this writing
-ALLOWED_MODEL_FAMILIES=turbo,gpt4,gpt4-32k,gpt4-turbo,claude,bison,aws-claude,dall-e
+ALLOWED_MODEL_FAMILIES=turbo,gpt4,gpt4-32k,gpt4-turbo,claude,gemini-pro,aws-claude,dall-e
 ```
 
 Refer to [.env.example](../.env.example) for a full list of supported model families. You can add `dall-e` to that list to enable all models.

docs/deploy-huggingface.md

@@ -1,5 +1,7 @@
 # Deploy to Huggingface Space
 
+**⚠️ This method is no longer recommended.  Please use the [self-hosting instructions](./self-hosting.md) instead.**
+
 This repository can be deployed to a [Huggingface Space](https://huggingface.co/spaces).  This is a free service that allows you to run a simple server in the cloud.  You can use it to safely share your OpenAI API key with a friend.
 
 ### 1. Get an API key
@@ -32,6 +34,7 @@ COPY Dockerfile greeting.md* .env* ./
 RUN npm run build
 EXPOSE 7860
 ENV NODE_ENV=production
+ENV NODE_OPTIONS="--max-old-space-size=12882"
 CMD [ "npm", "start" ]
 ```
 - Click "Commit new file to `main`" to save the Dockerfile.

docs/deploy-render.md

@@ -1,4 +1,7 @@
 # Deploy to Render.com
+
+**⚠️ This method is no longer recommended.  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.
 
 ### 1. Create account
@@ -28,6 +31,8 @@ The service will be created according to the instructions in the `render.yaml` f
   - For example, `OPENAI_KEY=sk-abc123`.
 - Click **Save Changes**.
 
+**IMPORTANT:** Set `TRUSTED_PROXIES=3`, otherwise users' IP addresses will not be recorded correctly (the server will see the IP address of Render's load balancer instead of the user's real IP address).
+
 The service will automatically rebuild and deploy with the new environment variables.  This will take a few minutes.  The link to your deployed proxy will appear at the top of the page.
 
 If you want to change the URL, go to the **Settings** tab of your Web Service and click the **Edit** button next to **Name**.  You can also set a custom domain, though I haven't tried this yet.

docs/self-hosting.md

@@ -0,0 +1,150 @@
+# Quick self-hosting guide
+
+Temporary guide for self-hosting. This will be improved in the future to provide more robust instructions and options. Provided commands are for Ubuntu.
+
+This uses prebuilt Docker images for convenience. If you want to make adjustments to the code you can instead clone the repo and follow the Local Development guide in the [README](../README.md).
+
+## Table of Contents
+- [Requirements](#requirements)
+- [Running the application](#running-the-application)
+- [Setting up a reverse proxy](#setting-up-a-reverse-proxy)
+  - [trycloudflare](#trycloudflare)
+  - [nginx](#nginx)
+    - [Example basic nginx configuration (no SSL)](#example-basic-nginx-configuration-no-ssl)
+    - [Example with Cloudflare SSL](#example-with-cloudflare-ssl)
+- [Updating/Restarting the application](#updatingrestarting-the-application)
+
+## Requirements
+
+- Docker
+- Docker Compose
+- A VPS with at least 512MB of RAM (1GB recommended)
+- A domain name
+
+If you don't have a VPS and domain name you can use TryCloudflare to set up a temporary URL that you can share with others. See [trycloudflare](#trycloudflare) for more information.
+
+## Running the application
+
+- Install Docker and Docker Compose
+- Create a new directory for the application
+  - This will contain your .env file, greeting file, and any user-generated files
+- Execute the following commands:
+  - ```
+    touch .env
+    touch greeting.md
+    echo "OPENAI_KEY=your-openai-key" >> .env
+    curl https://gitgud.io/khanon/oai-reverse-proxy/-/raw/main/docker/docker-compose-selfhost.yml -o docker-compose.yml
+    ```
+  - You can set further environment variables and keys in the `.env` file. See [.env.example](../.env.example) for a list of available options.
+  - You can set a custom greeting in `greeting.md`. This will be displayed on the homepage.
+- Run `docker compose up -d`
+
+You can check logs with `docker compose logs -n 100 -f`.
+
+The provided docker-compose file listens on port 7860 but binds to localhost only. You should use a reverse proxy to expose the application to the internet as described in the next section.
+
+## Setting up a reverse proxy
+
+Rather than exposing the application directly to the internet, it is recommended to set up a reverse proxy. This will allow you to use HTTPS and add additional security measures.
+
+### trycloudflare
+
+This will give you a temporary (72 hours) URL that you can use to let others connect to your instance securely, without having to set up a reverse proxy. If you are running the server on your home network, this is probably the best option.
+- Install `cloudflared` following the instructions at [try.cloudflare.com](https://try.cloudflare.com/).
+- Run `cloudflared tunnel --url http://localhost:7860`
+- You will be given a temporary URL that you can share with others.
+
+If you have a VPS, you should use a proper reverse proxy like nginx instead for a more permanent solution which will allow you to use your own domain name, handle SSL, and add additional security/anti-abuse measures.
+
+### nginx
+
+First, install nginx.
+- `sudo apt update && sudo apt install nginx`
+
+#### Example basic nginx configuration (no SSL)
+
+- `sudo nano /etc/nginx/sites-available/oai.conf`
+  - ```
+    server {
+        listen 80;
+        server_name example.com;
+    
+        location / {
+            proxy_pass http://localhost:7860;
+        }
+    }
+    ```
+  - Replace `example.com` with your domain name.
+  - Ctrl+X to exit, Y to save, Enter to confirm.
+- `sudo ln -s /etc/nginx/sites-available/oai.conf /etc/nginx/sites-enabled`
+- `sudo nginx -t`
+  - This will check the configuration file for errors.
+- `sudo systemctl restart nginx`
+  - This will restart nginx and apply the new configuration.
+
+#### Example with Cloudflare SSL
+
+This allows you to use a self-signed certificate on the server, and have Cloudflare handle client SSL. You need to have a Cloudflare account and have your domain set up with Cloudflare already, pointing to your server's IP address.
+
+- Set Cloudflare to use Full SSL mode. Since we are using a self-signed certificate, don't use Full (strict) mode.
+- Create a self-signed certificate:
+  - `openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/ssl/private/nginx-selfsigned.key -out /etc/ssl/certs/nginx-selfsigned.crt`
+- `sudo nano /etc/nginx/sites-available/oai.conf`
+  - ```
+    server {
+        listen 443 ssl;
+        server_name yourdomain.com www.yourdomain.com;
+    
+        ssl_certificate /etc/ssl/certs/nginx-selfsigned.crt;
+        ssl_certificate_key /etc/ssl/private/nginx-selfsigned.key;
+    
+        # Only allow inbound traffic from Cloudflare
+        allow 173.245.48.0/20;
+        allow 103.21.244.0/22;
+        allow 103.22.200.0/22;
+        allow 103.31.4.0/22;
+        allow 141.101.64.0/18;
+        allow 108.162.192.0/18;
+        allow 190.93.240.0/20;
+        allow 188.114.96.0/20;
+        allow 197.234.240.0/22;
+        allow 198.41.128.0/17;
+        allow 162.158.0.0/15;
+        allow 104.16.0.0/13;
+        allow 104.24.0.0/14;
+        allow 172.64.0.0/13;
+        allow 131.0.72.0/22;
+        deny all;
+    
+        location / {
+            proxy_pass http://localhost:7860;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection 'upgrade';
+            proxy_set_header Host $host;
+            proxy_cache_bypass $http_upgrade;
+        }
+    
+        ssl_protocols TLSv1.2 TLSv1.3;
+        ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256';
+        ssl_prefer_server_ciphers on;
+        ssl_session_cache shared:SSL:10m;
+    }
+    ```
+  - Replace `yourdomain.com` with your domain name.
+  - Ctrl+X to exit, Y to save, Enter to confirm.
+- `sudo ln -s /etc/nginx/sites-available/oai.conf /etc/nginx/sites-enabled`
+
+## Updating/Restarting the application
+
+After making an .env change, you need to restart the application for it to take effect.
+
+- `docker compose down`
+- `docker compose up -d`
+
+To update the application to the latest version:
+
+- `docker compose pull`
+- `docker compose down`
+- `docker compose up -d`
+- `docker image prune -f`

package-lock.json

@@ -10,32 +10,36 @@
       "license": "MIT",
       "dependencies": {
         "@anthropic-ai/tokenizer": "^0.0.4",
-        "@aws-crypto/sha256-js": "^5.1.0",
+        "@aws-crypto/sha256-js": "^5.2.0",
-        "@smithy/protocol-http": "^3.0.6",
+        "@smithy/eventstream-codec": "^2.1.3",
-        "@smithy/signature-v4": "^2.0.10",
+        "@smithy/eventstream-serde-node": "^2.1.3",
-        "@smithy/types": "^2.3.4",
+        "@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",
         "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": "^16.0.3",
+        "dotenv": "^16.3.1",
         "ejs": "^3.1.9",
         "express": "^4.18.2",
         "express-session": "^1.17.3",
         "firebase-admin": "^11.10.1",
         "googleapis": "^122.0.0",
         "http-proxy-middleware": "^3.0.0-beta.1",
-        "lifion-aws-event-stream": "^1.0.7",
         "memorystore": "^1.6.7",
         "multer": "^1.4.5-lts.1",
         "node-schedule": "^2.1.1",
         "pino": "^8.11.0",
         "pino-http": "^8.3.3",
-        "sanitize-html": "^2.11.0",
+        "sanitize-html": "2.12.1",
         "sharp": "^0.32.6",
         "showdown": "^2.1.0",
+        "source-map-support": "^0.5.21",
+        "stream-json": "^1.8.0",
         "tiktoken": "^1.0.10",
         "uuid": "^9.0.0",
         "zlib": "^1.0.5",
@@ -51,6 +55,7 @@
         "@types/node-schedule": "^2.1.0",
         "@types/sanitize-html": "^2.9.0",
         "@types/showdown": "^2.0.0",
+        "@types/stream-json": "^1.7.7",
         "@types/uuid": "^9.0.1",
         "concurrently": "^8.0.1",
         "esbuild": "^0.17.16",
@@ -59,9 +64,8 @@
         "nodemon": "^3.0.1",
         "pino-pretty": "^10.2.3",
         "prettier": "^3.0.3",
-        "source-map-support": "^0.5.21",
         "ts-node": "^10.9.1",
-        "typescript": "^5.1.3"
+        "typescript": "^5.4.2"
       },
       "engines": {
         "node": ">=18.0.0"
@@ -92,11 +96,11 @@
       "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg=="
     },
     "node_modules/@aws-crypto/sha256-js": {
-      "version": "5.1.0",
+      "version": "5.2.0",
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+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+      "integrity": "sha512-ZCmOJdvOWDBYJlzAoFkC+Q0+bUyEOS1ltgp1MGU03fqHG+dbi9tBFU2Rd9QKiDZFAYrhPh2JUf7rZRIuHRKtOg==",
+      "optional": true,
+      "dependencies": {
+        "prelude-ls": "~1.1.2"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -5453,9 +5453,9 @@
       "integrity": "sha512-/aCDEGatGvZ2BIk+HmLf4ifCJFwvKFNb9/JeZPMulfgFracn9QFcAf5GO8B/mweUjSoblS5In0cWhqpfs/5PQA=="
     },
     "node_modules/typescript": {
-      "version": "5.1.3",
+      "version": "5.4.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.1.3.tgz",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.2.tgz",
-      "integrity": "sha512-XH627E9vkeqhlZFQuL+UsyAXEnibT0kWR2FWONlr4sTjvxyJYnyefgrkyECLzM5NenmKzRAy2rR/OlYLA1HkZw==",
+      "integrity": "sha512-+2/g0Fds1ERlP6JsakQQDXjZdZMM+rqpamFZJEKh4kwTIn3iDkgKtby0CeNd5ATNZ4Ry1ax15TMx0W2V+miizQ==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
@@ -5598,9 +5598,9 @@
       }
     },
     "node_modules/word-wrap": {
-      "version": "1.2.4",
+      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.4.tgz",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
-      "integrity": "sha512-2V81OA4ugVo5pRo46hAoD2ivUJx8jXmWXfUkY4KFNw0hEptvN0QfH3K4nHiwzGeKl5rFKedV48QVoqYavy4YpA==",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
       "optional": true,
       "engines": {
         "node": ">=0.10.0"

package.json

@@ -18,32 +18,36 @@
   "license": "MIT",
   "dependencies": {
     "@anthropic-ai/tokenizer": "^0.0.4",
-    "@aws-crypto/sha256-js": "^5.1.0",
+    "@aws-crypto/sha256-js": "^5.2.0",
-    "@smithy/protocol-http": "^3.0.6",
+    "@smithy/eventstream-codec": "^2.1.3",
-    "@smithy/signature-v4": "^2.0.10",
+    "@smithy/eventstream-serde-node": "^2.1.3",
-    "@smithy/types": "^2.3.4",
+    "@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",
     "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": "^16.0.3",
+    "dotenv": "^16.3.1",
     "ejs": "^3.1.9",
     "express": "^4.18.2",
     "express-session": "^1.17.3",
     "firebase-admin": "^11.10.1",
     "googleapis": "^122.0.0",
     "http-proxy-middleware": "^3.0.0-beta.1",
-    "lifion-aws-event-stream": "^1.0.7",
     "memorystore": "^1.6.7",
     "multer": "^1.4.5-lts.1",
     "node-schedule": "^2.1.1",
     "pino": "^8.11.0",
     "pino-http": "^8.3.3",
-    "sanitize-html": "^2.11.0",
+    "sanitize-html": "2.12.1",
     "sharp": "^0.32.6",
     "showdown": "^2.1.0",
+    "source-map-support": "^0.5.21",
+    "stream-json": "^1.8.0",
     "tiktoken": "^1.0.10",
     "uuid": "^9.0.0",
     "zlib": "^1.0.5",
@@ -59,6 +63,7 @@
     "@types/node-schedule": "^2.1.0",
     "@types/sanitize-html": "^2.9.0",
     "@types/showdown": "^2.0.0",
+    "@types/stream-json": "^1.7.7",
     "@types/uuid": "^9.0.1",
     "concurrently": "^8.0.1",
     "esbuild": "^0.17.16",
@@ -67,12 +72,12 @@
     "nodemon": "^3.0.1",
     "pino-pretty": "^10.2.3",
     "prettier": "^3.0.3",
-    "source-map-support": "^0.5.21",
     "ts-node": "^10.9.1",
-    "typescript": "^5.1.3"
+    "typescript": "^5.4.2"
   },
   "overrides": {
     "google-gax": "^3.6.1",
-    "postcss": "^8.4.31"
+    "postcss": "^8.4.31",
+    "follow-redirects": "^1.15.4"
   }
 }

scripts/oai-reverse-proxy.http

@@ -81,7 +81,7 @@ Authorization: Bearer {{proxy-key}}
 Content-Type: application/json
 
 {
-  "model": "gpt-3.5-turbo",
+  "model": "gpt-4-1106-preview",
   "max_tokens": 20,
   "stream": true,
   "temperature": 1,
@@ -231,8 +231,36 @@ Content-Type: application/json
 }
 
 ###
-# @name Proxy / Google PaLM -- OpenAI-to-PaLM API Translation
+# @name Proxy / Azure OpenAI -- Native Chat Completions
-POST {{proxy-host}}/proxy/google-palm/v1/chat/completions
+POST {{proxy-host}}/proxy/azure/openai/chat/completions
+Authorization: Bearer {{proxy-key}}
+Content-Type: application/json
+
+{
+  "model": "gpt-4",
+  "max_tokens": 20,
+  "stream": true,
+  "temperature": 1,
+  "seed": 2,
+  "messages": [
+    {
+      "role": "user",
+      "content": "Hi what is the name of the fourth president of the united states?"
+    },
+    {
+      "role": "assistant",
+      "content": "That would be George Washington."
+    },
+    {
+      "role": "user",
+      "content": "That's not right."
+    }
+  ]
+}
+
+###
+# @name Proxy / Google AI -- OpenAI-to-Google AI API Translation
+POST {{proxy-host}}/proxy/google-ai/v1/chat/completions
 Authorization: Bearer {{proxy-key}}
 Content-Type: application/json
 

scripts/test-concurrency.js

@@ -1,6 +1,6 @@
 const axios = require("axios");
 
-const concurrentRequests = 5;
+const concurrentRequests = 75;
 const headers = {
   Authorization: "Bearer test",
   "Content-Type": "application/json",
@@ -16,7 +16,7 @@ const payload = {
 const makeRequest = async (i) => {
   try {
     const response = await axios.post(
-      "http://localhost:7860/proxy/azure/openai/v1/chat/completions",
+      "http://localhost:7860/proxy/google-ai/v1/chat/completions",
       payload,
       { headers }
     );
@@ -25,7 +25,8 @@ const makeRequest = async (i) => {
       response.data
     );
   } catch (error) {
-    console.error(`Error in req ${i}:`, error.message);
+    const msg = error.response
+    console.error(`Error in req ${i}:`, error.message, msg || "");
   }
 };
 

src/admin/routes.ts

@@ -4,7 +4,8 @@ import { HttpError } from "../shared/errors";
 import { injectLocals } from "../shared/inject-locals";
 import { withSession } from "../shared/with-session";
 import { injectCsrfToken, checkCsrfToken } from "../shared/inject-csrf";
-import { buildInfoPageHtml } from "../info-page";
+import { renderPage } from "../info-page";
+import { buildInfo } from "../service-info";
 import { loginRouter } from "./login";
 import { usersApiRouter as apiRouter } from "./api/users";
 import { usersWebRouter as webRouter } from "./web/manage";
@@ -26,7 +27,7 @@ adminRouter.use("/", loginRouter);
 adminRouter.use("/manage", authorize({ via: "cookie" }), webRouter);
 adminRouter.use("/service-info", authorize({ via: "cookie" }), (req, res) => {
   return res.send(
-    buildInfoPageHtml(req.protocol + "://" + req.get("host"), true)
+    renderPage(buildInfo(req.protocol + "://" + req.get("host"), true))
   );
 });
 

src/admin/web/manage.ts

@@ -6,7 +6,7 @@ import { HttpError } from "../../shared/errors";
 import * as userStore from "../../shared/users/user-store";
 import { parseSort, sortBy, paginate } from "../../shared/utils";
 import { keyPool } from "../../shared/key-management";
-import { MODEL_FAMILIES } from "../../shared/models";
+import { LLMService, MODEL_FAMILIES } from "../../shared/models";
 import { getTokenCostUsd, prettyTokens } from "../../shared/stats";
 import {
   User,
@@ -14,6 +14,7 @@ import {
   UserSchema,
   UserTokenCounts,
 } from "../../shared/users/schema";
+import { getLastNImages } from "../../shared/file-storage/image-history";
 
 const router = Router();
 
@@ -196,13 +197,14 @@ router.post("/maintenance", (req, res) => {
   let flash = { type: "", message: "" };
   switch (action) {
     case "recheck": {
-      keyPool.recheck("openai");
+      const checkable: LLMService[] = ["openai", "anthropic", "aws", "azure"];
-      keyPool.recheck("anthropic");
+      checkable.forEach((s) => keyPool.recheck(s));
-      const size = keyPool
+      const keyCount = keyPool
         .list()
-        .filter((k) => k.service !== "google-palm").length;
+        .filter((k) => checkable.includes(k.service)).length;
+
       flash.type = "success";
-      flash.message = `Scheduled recheck of ${size} keys for OpenAI and Anthropic.`;
+      flash.message = `Scheduled recheck of ${keyCount} keys.`;
       break;
     }
     case "resetQuotas": {
@@ -220,6 +222,18 @@ router.post("/maintenance", (req, res) => {
       flash.message = `All users' token usage records reset.`;
       break;
     }
+    case "downloadImageMetadata": {
+      const data = JSON.stringify({
+        exportedAt: new Date().toISOString(),
+        generations: getLastNImages()
+      }, null, 2);
+      res.setHeader(
+        "Content-Disposition",
+        `attachment; filename=image-metadata-${new Date().toISOString()}.json`
+      );
+      res.setHeader("Content-Type", "application/json");
+      return res.send(data);
+    }
     default: {
       throw new HttpError(400, "Invalid action");
     }

src/admin/web/views/admin_index.ejs

@@ -50,6 +50,13 @@
       </p>
     </fieldset>
     <% } %>
+    <% if (imageGenerationEnabled) { %>
+    <fieldset>
+      <legend>Image Generation</legend>
+      <button id="download-image-metadata" type="button" onclick="submitForm('downloadImageMetadata')">Download Image Metadata</button>
+      <label for="download-image-metadata">Downloads a metadata file containing URL, prompt, and truncated user token for all cached images.</label>
+    </fieldset>
+    <% } %>
   </div>
 </form>
 

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

@@ -6,7 +6,7 @@
     <% } else { %>
     <input type="checkbox" id="toggle-nicknames" onchange="toggleNicknames()" />
     <label for="toggle-nicknames">Show Nicknames</label>
-    <table>
+    <table class="striped">
       <thead>
         <tr>
           <th>User</th>

src/config.ts

@@ -4,6 +4,7 @@ import path from "path";
 import pino from "pino";
 import type { ModelFamily } from "./shared/models";
 import { MODEL_FAMILIES } from "./shared/models";
+
 dotenv.config();
 
 const startupLogger = pino({ level: "debug" }).child({ module: "startup" });
@@ -15,12 +16,22 @@ export const USER_ASSETS_DIR = path.join(DATA_DIR, "user-files");
 type Config = {
   /** The port the proxy server will listen on. */
   port: number;
+  /** The network interface the proxy server will listen on. */
+  bindAddress: string;
   /** Comma-delimited list of OpenAI API keys. */
   openaiKey?: string;
   /** Comma-delimited list of Anthropic API keys. */
   anthropicKey?: string;
-  /** Comma-delimited list of Google PaLM API keys. */
+  /**
-  googlePalmKey?: string;
+   * Comma-delimited list of Google AI API keys. Note that these are not the
+   * same as the GCP keys/credentials used for Vertex AI; the models are the
+   * same but the APIs are different. Vertex is the GCP product for enterprise.
+   **/
+  googleAIKey?: string;
+  /**
+   * Comma-delimited list of Mistral AI API keys.
+   */
+  mistralAIKey?: string;
   /**
    * Comma-delimited list of AWS credentials. Each credential item should be a
    * colon-delimited list of access key, secret key, and AWS region.
@@ -54,6 +65,11 @@ type Config = {
    * management mode is set to 'user_token'.
    */
   adminKey?: string;
+  /**
+   * The password required to view the service info/status page. If not set, the
+   * info page will be publicly accessible.
+   */
+  serviceInfoPassword?: string;
   /**
    * Which user management mode to use.
    * - `none`: No user management. Proxy is open to all requests with basic
@@ -189,19 +205,71 @@ type Config = {
    * configured ADMIN_KEY and go to /admin/service-info.
    **/
   staticServiceInfo?: boolean;
+  /**
+   * Trusted proxy hops. If you are deploying the server behind a reverse proxy
+   * (Nginx, Cloudflare Tunnel, AWS WAF, etc.) the IP address of incoming
+   * requests will be the IP address of the proxy, not the actual user.
+   *
+   * Depending on your hosting configuration, there may be multiple proxies/load
+   * balancers between your server and the user. Each one will append the
+   * incoming IP address to the `X-Forwarded-For` header. The user's real IP
+   * address will be the first one in the list, assuming the header has not been
+   * tampered with. Setting this value correctly ensures that the server doesn't
+   * trust values in `X-Forwarded-For` not added by trusted proxies.
+   *
+   * In order for the server to determine the user's real IP address, you need
+   * to tell it how many proxies are between the user and the server so it can
+   * select the correct IP address from the `X-Forwarded-For` header.
+   *
+   * *WARNING:* If you set it incorrectly, the proxy will either record the
+   * wrong IP address, or it will be possible for users to spoof their IP
+   * addresses and bypass rate limiting. Check the request logs to see what
+   * incoming X-Forwarded-For values look like.
+   *
+   * Examples:
+   *  - X-Forwarded-For: "34.1.1.1, 172.1.1.1, 10.1.1.1" => trustedProxies: 3
+   *  - X-Forwarded-For: "34.1.1.1" => trustedProxies: 1
+   *  - no X-Forwarded-For header => trustedProxies: 0 (the actual IP of the incoming request will be used)
+   *
+   * As of 2024/01/08:
+   * For HuggingFace or Cloudflare Tunnel, use 1.
+   * For Render, use 3.
+   * For deployments not behind a load balancer, use 0.
+   *
+   * You should double check against your actual request logs to be sure.
+   *
+   * Defaults to 1, as most deployments are on HuggingFace or Cloudflare Tunnel.
+   */
+  trustedProxies?: number;
+  /**
+   * Whether to allow OpenAI tool usage.  The proxy doesn't impelment any
+   * support for tools/function calling but can pass requests and responses as
+   * is. Note that the proxy also cannot accurately track quota usage for
+   * requests involving tools, so you must opt in to this feature at your own
+   * risk.
+   */
+  allowOpenAIToolUsage?: boolean;
+  /**
+   * Allows overriding the default proxy endpoint route. Defaults to /proxy.
+   * A leading slash is required.
+   */
+  proxyEndpointRoute: string;
 };
 
 // To change configs, create a file called .env in the root directory.
 // See .env.example for an example.
 export const config: Config = {
   port: getEnvWithDefault("PORT", 7860),
+  bindAddress: getEnvWithDefault("BIND_ADDRESS", "0.0.0.0"),
   openaiKey: getEnvWithDefault("OPENAI_KEY", ""),
   anthropicKey: getEnvWithDefault("ANTHROPIC_KEY", ""),
-  googlePalmKey: getEnvWithDefault("GOOGLE_PALM_KEY", ""),
+  googleAIKey: getEnvWithDefault("GOOGLE_AI_KEY", ""),
+  mistralAIKey: getEnvWithDefault("MISTRAL_AI_KEY", ""),
   awsCredentials: getEnvWithDefault("AWS_CREDENTIALS", ""),
   azureCredentials: getEnvWithDefault("AZURE_CREDENTIALS", ""),
   proxyKey: getEnvWithDefault("PROXY_KEY", ""),
   adminKey: getEnvWithDefault("ADMIN_KEY", ""),
+  serviceInfoPassword: getEnvWithDefault("SERVICE_INFO_PASSWORD", ""),
   gatekeeper: getEnvWithDefault("GATEKEEPER", "none"),
   gatekeeperStore: getEnvWithDefault("GATEKEEPER_STORE", "memory"),
   maxIpsPerUser: getEnvWithDefault("MAX_IPS_PER_USER", 0),
@@ -229,7 +297,12 @@ export const config: Config = {
     "gpt4-32k",
     "gpt4-turbo",
     "claude",
-    "bison",
+    "claude-opus",
+    "gemini-pro",
+    "mistral-tiny",
+    "mistral-small",
+    "mistral-medium",
+    "mistral-large",
     "aws-claude",
     "azure-turbo",
     "azure-gpt4",
@@ -273,6 +346,9 @@ export const config: Config = {
   showRecentImages: getEnvWithDefault("SHOW_RECENT_IMAGES", true),
   useInsecureCookies: getEnvWithDefault("USE_INSECURE_COOKIES", isDev),
   staticServiceInfo: getEnvWithDefault("STATIC_SERVICE_INFO", false),
+  trustedProxies: getEnvWithDefault("TRUSTED_PROXIES", 1),
+  allowOpenAIToolUsage: getEnvWithDefault("ALLOW_OPENAI_TOOL_USAGE", false),
+  proxyEndpointRoute: getEnvWithDefault("PROXY_ENDPOINT_ROUTE", "/proxy"),
 } as const;
 
 function generateCookieSecret() {
@@ -361,17 +437,21 @@ export const SENSITIVE_KEYS: (keyof Config)[] = ["googleSheetsSpreadsheetId"];
  * Config keys that are not displayed on the info page at all, generally because
  * they are not relevant to the user or can be inferred from other config.
  */
-export const OMITTED_KEYS: (keyof Config)[] = [
+export const OMITTED_KEYS = [
   "port",
+  "bindAddress",
   "logLevel",
   "openaiKey",
   "anthropicKey",
-  "googlePalmKey",
+  "googleAIKey",
+  "mistralAIKey",
   "awsCredentials",
   "azureCredentials",
   "proxyKey",
   "adminKey",
+  "serviceInfoPassword",
   "rejectPhrases",
+  "rejectMessage",
   "showTokenCosts",
   "googleSheetsKey",
   "firebaseKey",
@@ -387,34 +467,48 @@ export const OMITTED_KEYS: (keyof Config)[] = [
   "staticServiceInfo",
   "checkKeys",
   "allowedModelFamilies",
-];
+  "trustedProxies",
+  "proxyEndpointRoute",
+] satisfies (keyof Config)[];
+type OmitKeys = (typeof OMITTED_KEYS)[number];
+
+type Printable<T> = {
+  [P in keyof T as Exclude<P, OmitKeys>]: T[P] extends object
+    ? Printable<T[P]>
+    : string;
+};
+type PublicConfig = Printable<Config>;
 
 const getKeys = Object.keys as <T extends object>(obj: T) => Array<keyof T>;
 
-export function listConfig(obj: Config = config): Record<string, any> {
+export function listConfig(obj: Config = config) {
-  const result: Record<string, any> = {};
+  const result: Record<string, unknown> = {};
   for (const key of getKeys(obj)) {
     const value = obj[key]?.toString() || "";
 
-    const shouldOmit =
-      OMITTED_KEYS.includes(key) || value === "" || value === "undefined";
     const shouldMask = SENSITIVE_KEYS.includes(key);
+    const shouldOmit =
+      OMITTED_KEYS.includes(key as OmitKeys) ||
+      value === "" ||
+      value === "undefined";
 
     if (shouldOmit) {
       continue;
     }
 
+    const validKey = key as keyof Printable<Config>;
+
     if (value && shouldMask) {
-      result[key] = "********";
+      result[validKey] = "********";
     } else {
-      result[key] = value;
+      result[validKey] = value;
     }
 
     if (typeof obj[key] === "object" && !Array.isArray(obj[key])) {
       result[key] = listConfig(obj[key] as unknown as Config);
     }
   }
-  return result;
+  return result as PublicConfig;
 }
 
 /**
@@ -433,7 +527,7 @@ function getEnvWithDefault<T>(env: string | string[], defaultValue: T): T {
       [
         "OPENAI_KEY",
         "ANTHROPIC_KEY",
-        "GOOGLE_PALM_KEY",
+        "GOOGLE_AI_KEY",
         "AWS_CREDENTIALS",
         "AZURE_CREDENTIALS",
       ].includes(String(env))

src/info-page.ts

@@ -1,74 +1,44 @@
-/** This whole module really sucks */
+/** This whole module kinda sucks */
 import fs from "fs";
-import { Request, Response } from "express";
+import express, { Router, Request, Response } from "express";
 import showdown from "showdown";
-import { config, listConfig } from "./config";
+import { config } from "./config";
-import {
+import { buildInfo, ServiceInfo } from "./service-info";
-  AnthropicKey,
-  AwsBedrockKey,
-  AzureOpenAIKey,
-  GooglePalmKey,
-  keyPool,
-  OpenAIKey,
-} from "./shared/key-management";
-import {
-  AzureOpenAIModelFamily,
-  ModelFamily,
-  OpenAIModelFamily,
-} from "./shared/models";
-import { getUniqueIps } from "./proxy/rate-limit";
-import { getEstimatedWaitTime, getQueueLength } from "./proxy/queue";
-import { getTokenCostUsd, prettyTokens } from "./shared/stats";
-import { assertNever } from "./shared/utils";
 import { getLastNImages } from "./shared/file-storage/image-history";
+import { keyPool } from "./shared/key-management";
+import { MODEL_FAMILY_SERVICE, ModelFamily } from "./shared/models";
+import { withSession } from "./shared/with-session";
+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",
+  gpt4: "GPT-4",
+  "gpt4-32k": "GPT-4 32k",
+  "gpt4-turbo": "GPT-4 Turbo",
+  "dall-e": "DALL-E",
+  claude: "Claude (Sonnet)",
+  "claude-opus": "Claude (Opus)",
+  "gemini-pro": "Gemini Pro",
+  "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-medium": "Mistral Medium",
+  "mistral-large": "Mistral Large",
+  "aws-claude": "AWS Claude (Sonnet)",
+  "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-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")}`
+  : "";
 let infoPageHtml: string | undefined;
 let infoPageLastUpdated = 0;
 
-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 keyIsGooglePalmKey = (k: KeyPoolKey): k is GooglePalmKey =>
-  k.service === "google-palm";
-const keyIsAwsKey = (k: KeyPoolKey): k is AwsBedrockKey => k.service === "aws";
-
-type ModelAggregates = {
-  active: number;
-  trial?: number;
-  revoked?: number;
-  overQuota?: number;
-  pozzed?: number;
-  awsLogged?: number;
-  queued: number;
-  queueTime: string;
-  tokens: number;
-};
-type ModelAggregateKey = `${ModelFamily}__${keyof ModelAggregates}`;
-type ServiceAggregates = {
-  status?: string;
-  openaiKeys?: number;
-  openaiOrgs?: number;
-  anthropicKeys?: number;
-  palmKeys?: number;
-  awsKeys?: number;
-  azureKeys?: number;
-  proompts: number;
-  tokens: number;
-  tokenCost: number;
-  openAiUncheckedKeys?: number;
-  anthropicUncheckedKeys?: number;
-} & {
-  [modelFamily in ModelFamily]?: ModelAggregates;
-};
-
-const modelStats = new Map<ModelAggregateKey, number>();
-const serviceStats = new Map<keyof ServiceAggregates, number>();
-
 export const handleInfoPage = (req: Request, res: Response) => {
   if (infoPageLastUpdated + INFO_PAGE_TTL > Date.now()) {
     return res.send(infoPageHtml);
@@ -79,87 +49,16 @@ export const handleInfoPage = (req: Request, res: Response) => {
       ? getExternalUrlForHuggingfaceSpaceId(process.env.SPACE_ID)
       : req.protocol + "://" + req.get("host");
 
-  infoPageHtml = buildInfoPageHtml(baseUrl + "/proxy");
+  const info = buildInfo(baseUrl + config.proxyEndpointRoute);
+  infoPageHtml = renderPage(info);
   infoPageLastUpdated = Date.now();
 
   res.send(infoPageHtml);
 };
 
-function getCostString(cost: number) {
+export function renderPage(info: ServiceInfo) {
-  if (!config.showTokenCosts) return "";
-  return ` ($${cost.toFixed(2)})`;
-}
-
-export function buildInfoPageHtml(baseUrl: string, asAdmin = false) {
-  const keys = keyPool.list();
-  const hideFullInfo = config.staticServiceInfo && !asAdmin;
-
-  modelStats.clear();
-  serviceStats.clear();
-  keys.forEach(addKeyToAggregates);
-
-  const openaiKeys = serviceStats.get("openaiKeys") || 0;
-  const anthropicKeys = serviceStats.get("anthropicKeys") || 0;
-  const palmKeys = serviceStats.get("palmKeys") || 0;
-  const awsKeys = serviceStats.get("awsKeys") || 0;
-  const azureKeys = serviceStats.get("azureKeys") || 0;
-  const proompts = serviceStats.get("proompts") || 0;
-  const tokens = serviceStats.get("tokens") || 0;
-  const tokenCost = serviceStats.get("tokenCost") || 0;
-
-  const allowDalle = config.allowedModelFamilies.includes("dall-e");
-
-  const endpoints = {
-    ...(openaiKeys ? { openai: baseUrl + "/openai" } : {}),
-    ...(openaiKeys ? { openai2: baseUrl + "/openai/turbo-instruct" } : {}),
-    ...(openaiKeys && allowDalle
-      ? { ["openai-image"]: baseUrl + "/openai-image" }
-      : {}),
-    ...(anthropicKeys ? { anthropic: baseUrl + "/anthropic" } : {}),
-    ...(palmKeys ? { "google-palm": baseUrl + "/google-palm" } : {}),
-    ...(awsKeys ? { aws: baseUrl + "/aws/claude" } : {}),
-    ...(azureKeys ? { azure: baseUrl + "/azure/openai" } : {}),
-  };
-
-  const stats = {
-    proompts,
-    tookens: `${prettyTokens(tokens)}${getCostString(tokenCost)}`,
-    ...(config.textModelRateLimit ? { proomptersNow: getUniqueIps() } : {}),
-  };
-
-  const keyInfo = { openaiKeys, anthropicKeys, palmKeys, awsKeys, azureKeys };
-  for (const key of Object.keys(keyInfo)) {
-    if (!(keyInfo as any)[key]) delete (keyInfo as any)[key];
-  }
-
-  const providerInfo = {
-    ...(openaiKeys ? getOpenAIInfo() : {}),
-    ...(anthropicKeys ? getAnthropicInfo() : {}),
-    ...(palmKeys ? getPalmInfo() : {}),
-    ...(awsKeys ? getAwsInfo() : {}),
-    ...(azureKeys ? getAzureInfo() : {}),
-  };
-
-  if (hideFullInfo) {
-    for (const provider of Object.keys(providerInfo)) {
-      delete (providerInfo as any)[provider].proomptersInQueue;
-      delete (providerInfo as any)[provider].estimatedQueueTime;
-      delete (providerInfo as any)[provider].usage;
-    }
-  }
-
-  const info = {
-    uptime: Math.floor(process.uptime()),
-    endpoints,
-    ...(hideFullInfo ? {} : stats),
-    ...keyInfo,
-    ...providerInfo,
-    config: listConfig(),
-    build: process.env.BUILD_INFO || "dev",
-  };
-
   const title = getServerTitle();
-  const headerHtml = buildInfoPageHeader(new showdown.Converter(), title);
+  const headerHtml = buildInfoPageHeader(info);
 
   return `<!DOCTYPE html>
 <html lang="en">
@@ -167,8 +66,25 @@ export function buildInfoPageHtml(baseUrl: string, asAdmin = false) {
     <meta charset="utf-8" />
     <meta name="robots" content="noindex" />
     <title>${title}</title>
+    <style>
+      body {
+        font-family: sans-serif;
+        background-color: #f0f0f0;
+        padding: 1em;
+      }
+      @media (prefers-color-scheme: dark) {
+        body {
+          background-color: #222;
+          color: #eee;
+        }
+        
+        a:link, a:visited {
+          color: #bbe;
+        }
+      }
+    </style>
   </head>
-  <body style="font-family: sans-serif; background-color: #f0f0f0; padding: 1em;">
+  <body>
     ${headerHtml}
     <hr />
     <h2>Service Info</h2>
@@ -178,324 +94,14 @@ export function buildInfoPageHtml(baseUrl: string, asAdmin = false) {
 </html>`;
 }
 
-function getUniqueOpenAIOrgs(keys: KeyPoolKey[]) {
-  const orgIds = new Set(
-    keys.filter((k) => k.service === "openai").map((k: any) => k.organizationId)
-  );
-  return orgIds.size;
-}
-
-function increment<T extends keyof ServiceAggregates | ModelAggregateKey>(
-  map: Map<T, number>,
-  key: T,
-  delta = 1
-) {
-  map.set(key, (map.get(key) || 0) + delta);
-}
-
-function addKeyToAggregates(k: KeyPoolKey) {
-  increment(serviceStats, "proompts", k.promptCount);
-  increment(serviceStats, "openaiKeys", k.service === "openai" ? 1 : 0);
-  increment(serviceStats, "anthropicKeys", k.service === "anthropic" ? 1 : 0);
-  increment(serviceStats, "palmKeys", k.service === "google-palm" ? 1 : 0);
-  increment(serviceStats, "awsKeys", k.service === "aws" ? 1 : 0);
-  increment(serviceStats, "azureKeys", k.service === "azure" ? 1 : 0);
-
-  let sumTokens = 0;
-  let sumCost = 0;
-
-  switch (k.service) {
-    case "openai":
-      if (!keyIsOpenAIKey(k)) throw new Error("Invalid key type");
-      increment(
-        serviceStats,
-        "openAiUncheckedKeys",
-        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);
-      });
-      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": {
-      if (!keyIsAnthropicKey(k)) throw new Error("Invalid key type");
-      const family = "claude";
-      sumTokens += k.claudeTokens;
-      sumCost += getTokenCostUsd(family, k.claudeTokens);
-      increment(modelStats, `${family}__active`, k.isDisabled ? 0 : 1);
-      increment(modelStats, `${family}__revoked`, k.isRevoked ? 1 : 0);
-      increment(modelStats, `${family}__tokens`, k.claudeTokens);
-      increment(modelStats, `${family}__pozzed`, k.isPozzed ? 1 : 0);
-      increment(
-        serviceStats,
-        "anthropicUncheckedKeys",
-        Boolean(k.lastChecked) ? 0 : 1
-      );
-      break;
-    }
-    case "google-palm": {
-      if (!keyIsGooglePalmKey(k)) throw new Error("Invalid key type");
-      const family = "bison";
-      sumTokens += k.bisonTokens;
-      sumCost += getTokenCostUsd(family, k.bisonTokens);
-      increment(modelStats, `${family}__active`, k.isDisabled ? 0 : 1);
-      increment(modelStats, `${family}__revoked`, k.isRevoked ? 1 : 0);
-      increment(modelStats, `${family}__tokens`, k.bisonTokens);
-      break;
-    }
-    case "aws": {
-      if (!keyIsAwsKey(k)) throw new Error("Invalid key type");
-      const family = "aws-claude";
-      sumTokens += k["aws-claudeTokens"];
-      sumCost += getTokenCostUsd(family, k["aws-claudeTokens"]);
-      increment(modelStats, `${family}__active`, k.isDisabled ? 0 : 1);
-      increment(modelStats, `${family}__revoked`, k.isRevoked ? 1 : 0);
-      increment(modelStats, `${family}__tokens`, k["aws-claudeTokens"]);
-
-      // 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);
-
-      break;
-    }
-    default:
-      assertNever(k.service);
-  }
-
-  increment(serviceStats, "tokens", sumTokens);
-  increment(serviceStats, "tokenCost", sumCost);
-}
-
-function getOpenAIInfo() {
-  const info: { status?: string; openaiKeys?: number; openaiOrgs?: number } & {
-    [modelFamily in OpenAIModelFamily]?: {
-      usage?: string;
-      activeKeys: number;
-      trialKeys?: number;
-      revokedKeys?: number;
-      overQuotaKeys?: number;
-      proomptersInQueue?: number;
-      estimatedQueueTime?: string;
-    };
-  } = {};
-
-  const keys = keyPool.list().filter(keyIsOpenAIKey);
-  const enabledFamilies = new Set(config.allowedModelFamilies);
-  const accessibleFamilies = keys
-    .flatMap((k) => k.modelFamilies)
-    .filter((f) => enabledFamilies.has(f))
-    .concat("turbo");
-  const familySet = new Set(accessibleFamilies);
-
-  if (config.checkKeys) {
-    const unchecked = serviceStats.get("openAiUncheckedKeys") || 0;
-    if (unchecked > 0) {
-      info.status = `Checking ${unchecked} keys...`;
-    }
-    info.openaiKeys = keys.length;
-    info.openaiOrgs = getUniqueOpenAIOrgs(keys);
-
-    familySet.forEach((f) => {
-      const tokens = modelStats.get(`${f}__tokens`) || 0;
-      const cost = getTokenCostUsd(f, tokens);
-
-      info[f] = {
-        usage: `${prettyTokens(tokens)} tokens${getCostString(cost)}`,
-        activeKeys: modelStats.get(`${f}__active`) || 0,
-        trialKeys: modelStats.get(`${f}__trial`) || 0,
-        revokedKeys: modelStats.get(`${f}__revoked`) || 0,
-        overQuotaKeys: modelStats.get(`${f}__overQuota`) || 0,
-      };
-
-      // Don't show trial/revoked keys for non-turbo families.
-      // Generally those stats only make sense for the lowest-tier model.
-      if (f !== "turbo") {
-        delete info[f]!.trialKeys;
-        delete info[f]!.revokedKeys;
-      }
-    });
-  } else {
-    info.status = "Key checking is disabled.";
-    info.turbo = { activeKeys: keys.filter((k) => !k.isDisabled).length };
-    info.gpt4 = {
-      activeKeys: keys.filter(
-        (k) => !k.isDisabled && k.modelFamilies.includes("gpt4")
-      ).length,
-    };
-  }
-
-  familySet.forEach((f) => {
-    if (enabledFamilies.has(f)) {
-      if (!info[f]) info[f] = { activeKeys: 0 }; // may occur if checkKeys is disabled
-      const { estimatedQueueTime, proomptersInQueue } = getQueueInformation(f);
-      info[f]!.proomptersInQueue = proomptersInQueue;
-      info[f]!.estimatedQueueTime = estimatedQueueTime;
-    } else {
-      (info[f]! as any).status = "GPT-3.5-Turbo is disabled on this proxy.";
-    }
-  });
-
-  return info;
-}
-
-function getAnthropicInfo() {
-  const claudeInfo: Partial<ModelAggregates> = {
-    active: modelStats.get("claude__active") || 0,
-    pozzed: modelStats.get("claude__pozzed") || 0,
-    revoked: modelStats.get("claude__revoked") || 0,
-  };
-
-  const queue = getQueueInformation("claude");
-  claudeInfo.queued = queue.proomptersInQueue;
-  claudeInfo.queueTime = queue.estimatedQueueTime;
-
-  const tokens = modelStats.get("claude__tokens") || 0;
-  const cost = getTokenCostUsd("claude", tokens);
-
-  const unchecked =
-    (config.checkKeys && serviceStats.get("anthropicUncheckedKeys")) || 0;
-
-  return {
-    claude: {
-      usage: `${prettyTokens(tokens)} tokens${getCostString(cost)}`,
-      ...(unchecked > 0 ? { status: `Checking ${unchecked} keys...` } : {}),
-      activeKeys: claudeInfo.active,
-      revokedKeys: claudeInfo.revoked,
-      ...(config.checkKeys ? { pozzedKeys: claudeInfo.pozzed } : {}),
-      proomptersInQueue: claudeInfo.queued,
-      estimatedQueueTime: claudeInfo.queueTime,
-    },
-  };
-}
-
-function getPalmInfo() {
-  const bisonInfo: Partial<ModelAggregates> = {
-    active: modelStats.get("bison__active") || 0,
-    revoked: modelStats.get("bison__revoked") || 0,
-  };
-
-  const queue = getQueueInformation("bison");
-  bisonInfo.queued = queue.proomptersInQueue;
-  bisonInfo.queueTime = queue.estimatedQueueTime;
-
-  const tokens = modelStats.get("bison__tokens") || 0;
-  const cost = getTokenCostUsd("bison", tokens);
-
-  return {
-    bison: {
-      usage: `${prettyTokens(tokens)} tokens${getCostString(cost)}`,
-      activeKeys: bisonInfo.active,
-      revokedKeys: bisonInfo.revoked,
-      proomptersInQueue: bisonInfo.queued,
-      estimatedQueueTime: bisonInfo.queueTime,
-    },
-  };
-}
-
-function getAwsInfo() {
-  const awsInfo: Partial<ModelAggregates> = {
-    active: modelStats.get("aws-claude__active") || 0,
-    revoked: modelStats.get("aws-claude__revoked") || 0,
-  };
-
-  const queue = getQueueInformation("aws-claude");
-  awsInfo.queued = queue.proomptersInQueue;
-  awsInfo.queueTime = queue.estimatedQueueTime;
-
-  const tokens = modelStats.get("aws-claude__tokens") || 0;
-  const cost = getTokenCostUsd("aws-claude", tokens);
-
-  const logged = modelStats.get("aws-claude__awsLogged") || 0;
-  const logMsg = config.allowAwsLogging
-    ? `${logged} active keys are potentially logged.`
-    : `${logged} active keys are potentially logged and can't be used. Set ALLOW_AWS_LOGGING=true to override.`;
-
-  return {
-    "aws-claude": {
-      usage: `${prettyTokens(tokens)} tokens${getCostString(cost)}`,
-      activeKeys: awsInfo.active,
-      revokedKeys: awsInfo.revoked,
-      proomptersInQueue: awsInfo.queued,
-      estimatedQueueTime: awsInfo.queueTime,
-      ...(logged > 0 ? { privacy: logMsg } : {}),
-    },
-  };
-}
-
-function getAzureInfo() {
-  const azureFamilies = [
-    "azure-turbo",
-    "azure-gpt4",
-    "azure-gpt4-turbo",
-    "azure-gpt4-32k",
-  ] as const;
-
-  const azureInfo: {
-    [modelFamily in AzureOpenAIModelFamily]?: {
-      usage?: string;
-      activeKeys: number;
-      revokedKeys?: number;
-      proomptersInQueue?: number;
-      estimatedQueueTime?: string;
-    };
-  } = {};
-  for (const family of azureFamilies) {
-    const familyAllowed = config.allowedModelFamilies.includes(family);
-    const activeKeys = modelStats.get(`${family}__active`) || 0;
-
-    if (!familyAllowed || activeKeys === 0) continue;
-
-    azureInfo[family] = {
-      activeKeys,
-      revokedKeys: modelStats.get(`${family}__revoked`) || 0,
-    };
-
-    const queue = getQueueInformation(family);
-    azureInfo[family]!.proomptersInQueue = queue.proomptersInQueue;
-    azureInfo[family]!.estimatedQueueTime = queue.estimatedQueueTime;
-
-    const tokens = modelStats.get(`${family}__tokens`) || 0;
-    const cost = getTokenCostUsd(family, tokens);
-    azureInfo[family]!.usage = `${prettyTokens(tokens)} tokens${getCostString(
-      cost
-    )}`;
-  }
-
-  return azureInfo;
-}
-
-const customGreeting = fs.existsSync("greeting.md")
-  ? `\n## Server Greeting\n${fs.readFileSync("greeting.md", "utf8")}`
-  : "";
-
 /**
  * If the server operator provides a `greeting.md` file, it will be included in
  * the rendered info page.
  **/
-function buildInfoPageHeader(converter: showdown.Converter, title: string) {
+function buildInfoPageHeader(info: ServiceInfo) {
+  const title = getServerTitle();
   // TODO: use some templating engine instead of this mess
-  let infoBody = `<!-- Header for Showdown's parser, don't remove this line -->
+  let infoBody = `# ${title}`;
-# ${title}`;
   if (config.promptLogging) {
     infoBody += `\n## Prompt Logging Enabled
 This proxy keeps full logs of all prompts and AI responses. Prompt logs are anonymous and do not contain IP addresses or timestamps.
@@ -510,45 +116,20 @@ This proxy keeps full logs of all prompts and AI responses. Prompt logs are anon
   }
 
   const waits: string[] = [];
-  infoBody += `\n## Estimated Wait Times`;
 
-  if (config.openaiKey) {
+  for (const modelFamily of config.allowedModelFamilies) {
-    // TODO: un-fuck this
+    const service = MODEL_FAMILY_SERVICE[modelFamily];
-    const keys = keyPool.list().filter((k) => k.service === "openai");
 
-    const turboWait = getQueueInformation("turbo").estimatedQueueTime;
+    const hasKeys = keyPool.list().some((k) => {
-    waits.push(`**Turbo:** ${turboWait}`);
+      return k.service === service && k.modelFamilies.includes(modelFamily);
+    });
 
-    const gpt4Wait = getQueueInformation("gpt4").estimatedQueueTime;
+    const wait = info[modelFamily]?.estimatedQueueTime;
-    const hasGpt4 = keys.some((k) => k.modelFamilies.includes("gpt4"));
+    if (hasKeys && wait) {
-    const allowedGpt4 = config.allowedModelFamilies.includes("gpt4");
+      waits.push(
-    if (hasGpt4 && allowedGpt4) {
+        `**${MODEL_FAMILY_FRIENDLY_NAME[modelFamily] || modelFamily}**: ${wait}`
-      waits.push(`**GPT-4:** ${gpt4Wait}`);
+      );
     }
-
-    const gpt432kWait = getQueueInformation("gpt4-32k").estimatedQueueTime;
-    const hasGpt432k = keys.some((k) => k.modelFamilies.includes("gpt4-32k"));
-    const allowedGpt432k = config.allowedModelFamilies.includes("gpt4-32k");
-    if (hasGpt432k && allowedGpt432k) {
-      waits.push(`**GPT-4-32k:** ${gpt432kWait}`);
-    }
-
-    const dalleWait = getQueueInformation("dall-e").estimatedQueueTime;
-    const hasDalle = keys.some((k) => k.modelFamilies.includes("dall-e"));
-    const allowedDalle = config.allowedModelFamilies.includes("dall-e");
-    if (hasDalle && allowedDalle) {
-      waits.push(`**DALL-E:** ${dalleWait}`);
-    }
-  }
-
-  if (config.anthropicKey) {
-    const claudeWait = getQueueInformation("claude").estimatedQueueTime;
-    waits.push(`**Claude:** ${claudeWait}`);
-  }
-
-  if (config.awsCredentials) {
-    const awsClaudeWait = getQueueInformation("aws-claude").estimatedQueueTime;
-    waits.push(`**Claude (AWS):** ${awsClaudeWait}`);
   }
 
   infoBody += "\n\n" + waits.join(" / ");
@@ -565,21 +146,6 @@ function getSelfServiceLinks() {
   return `<footer style="font-size: 0.8em;"><hr /><a target="_blank" href="/user/lookup">Check your user token info</a></footer>`;
 }
 
-/** Returns queue time in seconds, or minutes + seconds if over 60 seconds. */
-function getQueueInformation(partition: ModelFamily) {
-  const waitMs = getEstimatedWaitTime(partition);
-  const waitTime =
-    waitMs < 60000
-      ? `${Math.round(waitMs / 1000)}sec`
-      : `${Math.round(waitMs / 60000)}min, ${Math.round(
-          (waitMs % 60000) / 1000
-        )}sec`;
-  return {
-    proomptersInQueue: getQueueLength(partition),
-    estimatedQueueTime: waitMs > 2000 ? waitTime : "no wait",
-  };
-}
-
 function getServerTitle() {
   // Use manually set title if available
   if (process.env.SERVER_TITLE) {
@@ -600,9 +166,10 @@ function getServerTitle() {
 }
 
 function buildRecentImageSection() {
+  const dalleModels: ModelFamily[] = ["azure-dall-e", "dall-e"];
   if (
-    !config.allowedModelFamilies.includes("dall-e") ||
+    !config.showRecentImages ||
-    !config.showRecentImages
+    dalleModels.every((f) => !config.allowedModelFamilies.includes(f))
   ) {
     return "";
   }
@@ -623,6 +190,7 @@ function buildRecentImageSection() {
 </div>`;
   }
   html += `</div>`;
+  html += `<p style="clear: both; text-align: center;"><a href="/user/image-history">View all recent images</a></p>`
 
   return html;
 }
@@ -644,3 +212,49 @@ function getExternalUrlForHuggingfaceSpaceId(spaceId: string) {
     return "";
   }
 }
+
+function checkIfUnlocked(
+  req: Request,
+  res: Response,
+  next: express.NextFunction
+) {
+  if (config.serviceInfoPassword?.length && !req.session?.unlocked) {
+    return res.redirect("/unlock-info");
+  }
+  next();
+}
+
+const infoPageRouter = Router();
+if (config.serviceInfoPassword?.length) {
+  infoPageRouter.use(
+    express.json({ limit: "1mb" }),
+    express.urlencoded({ extended: true, limit: "1mb" })
+  );
+  infoPageRouter.use(withSession);
+  infoPageRouter.use(injectCsrfToken, checkCsrfToken);
+  infoPageRouter.post("/unlock-info", (req, res) => {
+    if (req.body.password !== config.serviceInfoPassword) {
+      return res.status(403).send("Incorrect password");
+    }
+    req.session!.unlocked = true;
+    res.redirect("/");
+  });
+  infoPageRouter.get("/unlock-info", (_req, res) => {
+    if (_req.session?.unlocked) return res.redirect("/");
+
+    res.send(`
+      <form method="post" action="/unlock-info">
+        <h1>Unlock Service Info</h1>
+        <input type="hidden" name="_csrf" value="${res.locals.csrfToken}" />
+        <input type="password" name="password" placeholder="Password" />
+        <button type="submit">Unlock</button>
+      </form>
+    `);
+  });
+  infoPageRouter.use(checkIfUnlocked);
+}
+infoPageRouter.get("/", handleInfoPage);
+infoPageRouter.get("/status", (req, res) => {
+  res.json(buildInfo(req.protocol + "://" + req.get("host"), false));
+});
+export { infoPageRouter };

src/proxy/anthropic.ts

@@ -1,4 +1,4 @@
-import { Request, RequestHandler, Router } from "express";
+import { Request, Response, RequestHandler, Router } from "express";
 import { createProxyMiddleware } from "http-proxy-middleware";
 import { config } from "../config";
 import { logger } from "../logger";
@@ -16,6 +16,7 @@ import {
   ProxyResHandlerWithBody,
   createOnProxyResHandler,
 } from "./middleware/response";
+import { sendErrorToClient } from "./middleware/response/error-generator";
 
 let modelsCache: any = null;
 let modelsCacheTime = 0;
@@ -42,6 +43,9 @@ const getModelsResponse = () => {
     "claude-2",
     "claude-2.0",
     "claude-2.1",
+    "claude-3-haiku-20240307",
+    "claude-3-opus-20240229",
+    "claude-3-sonnet-20240229",
   ];
 
   const models = claudeVariants.map((id) => ({
@@ -75,30 +79,56 @@ const anthropicResponseHandler: ProxyResHandlerWithBody = async (
     throw new Error("Expected body to be an object");
   }
 
-  if (config.promptLogging) {
+  let newBody = body;
-    const host = req.get("host");
+  switch (`${req.inboundApi}<-${req.outboundApi}`) {
-    body.proxy_note = `Prompts are logged on this proxy instance. See ${host} for more information.`;
+    case "openai<-anthropic-text":
+      req.log.info("Transforming Anthropic Text back to OpenAI format");
+      newBody = transformAnthropicTextResponseToOpenAI(body, req);
+      break;
+    case "openai<-anthropic-chat":
+      req.log.info("Transforming Anthropic Chat back to OpenAI format");
+      newBody = transformAnthropicChatResponseToOpenAI(body);
+      break;
+    case "anthropic-text<-anthropic-chat":
+      req.log.info("Transforming Anthropic Chat back to Anthropic chat format");
+      newBody = transformAnthropicChatResponseToAnthropicText(body);
+      break;
   }
 
-  if (req.inboundApi === "openai") {
+  res.status(200).json({ ...newBody, proxy: body.proxy });
-    req.log.info("Transforming Anthropic response to OpenAI format");
-    body = transformAnthropicResponse(body, req);
-  }
-
-  if (req.tokenizerInfo) {
-    body.proxy_tokenizer = req.tokenizerInfo;
-  }
-
-  res.status(200).json(body);
 };
 
+function flattenChatResponse(
+  content: { type: string; text: string }[]
+): string {
+  return content
+    .map((part: { type: string; text: string }) =>
+      part.type === "text" ? part.text : ""
+    )
+    .join("\n");
+}
+
+export function transformAnthropicChatResponseToAnthropicText(
+  anthropicBody: Record<string, any>
+): Record<string, any> {
+  return {
+    type: "completion",
+    id: "ant-" + anthropicBody.id,
+    completion: flattenChatResponse(anthropicBody.content),
+    stop_reason: anthropicBody.stop_reason,
+    stop: anthropicBody.stop_sequence,
+    model: anthropicBody.model,
+    usage: anthropicBody.usage,
+  };
+}
+
 /**
  * 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 transformAnthropicResponse(
+function transformAnthropicTextResponseToOpenAI(
   anthropicBody: Record<string, any>,
   req: Request
 ): Record<string, any> {
@@ -126,6 +156,28 @@ function transformAnthropicResponse(
   };
 }
 
+function transformAnthropicChatResponseToOpenAI(
+  anthropicBody: Record<string, any>
+): Record<string, any> {
+  return {
+    id: "ant-" + anthropicBody.id,
+    object: "chat.completion",
+    created: Date.now(),
+    model: anthropicBody.model,
+    usage: anthropicBody.usage,
+    choices: [
+      {
+        message: {
+          role: "assistant",
+          content: flattenChatResponse(anthropicBody.content),
+        },
+        finish_reason: anthropicBody.stop_reason,
+        index: 0,
+      },
+    ],
+  };
+}
+
 const anthropicProxy = createQueueMiddleware({
   proxyMiddleware: createProxyMiddleware({
     target: "https://api.anthropic.com",
@@ -139,50 +191,165 @@ const anthropicProxy = createQueueMiddleware({
       proxyRes: createOnProxyResHandler([anthropicResponseHandler]),
       error: handleProxyError,
     },
-    pathRewrite: {
+    // Abusing pathFilter to rewrite the paths dynamically.
-      // Send OpenAI-compat requests to the real Anthropic endpoint.
+    pathFilter: (pathname, req) => {
-      "^/v1/chat/completions": "/v1/complete",
+      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;
     },
   }),
 });
 
+const nativeTextPreprocessor = createPreprocessorMiddleware({
+  inApi: "anthropic-text",
+  outApi: "anthropic-text",
+  service: "anthropic",
+});
+
+const textToChatPreprocessor = createPreprocessorMiddleware({
+  inApi: "anthropic-text",
+  outApi: "anthropic-chat",
+  service: "anthropic",
+});
+
+/**
+ * Routes text completion prompts to anthropic-chat if they need translation
+ * (claude-3 based models do not support the old text completion endpoint).
+ */
+const preprocessAnthropicTextRequest: RequestHandler = (req, res, next) => {
+  if (req.body.model?.startsWith("claude-3")) {
+    textToChatPreprocessor(req, res, next);
+  } else {
+    nativeTextPreprocessor(req, res, next);
+  }
+};
+
+const oaiToTextPreprocessor = createPreprocessorMiddleware({
+  inApi: "openai",
+  outApi: "anthropic-text",
+  service: "anthropic",
+});
+
+const oaiToChatPreprocessor = createPreprocessorMiddleware({
+  inApi: "openai",
+  outApi: "anthropic-chat",
+  service: "anthropic",
+});
+
+/**
+ * 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) => {
+  maybeReassignModel(req);
+  if (req.body.model?.includes("claude-3")) {
+    oaiToChatPreprocessor(req, res, next);
+  } else {
+    oaiToTextPreprocessor(req, res, next);
+  }
+};
+
 const anthropicRouter = Router();
 anthropicRouter.get("/v1/models", handleModelRequest);
 // Native Anthropic chat completion endpoint.
 anthropicRouter.post(
-  "/v1/complete",
+  "/v1/messages",
   ipLimiter,
   createPreprocessorMiddleware({
-    inApi: "anthropic",
+    inApi: "anthropic-chat",
-    outApi: "anthropic",
+    outApi: "anthropic-chat",
     service: "anthropic",
   }),
   anthropicProxy
 );
-// OpenAI-to-Anthropic compatibility endpoint.
+// Anthropic text completion endpoint. Translates to Anthropic chat completion
+// if the requested model is a Claude 3 model.
+anthropicRouter.post(
+  "/v1/complete",
+  ipLimiter,
+  preprocessAnthropicTextRequest,
+  anthropicProxy
+);
+// OpenAI-to-Anthropic compatibility endpoint. Accepts an OpenAI chat completion
+// request and transforms/routes it to the appropriate Anthropic format and
+// endpoint based on the requested model.
 anthropicRouter.post(
   "/v1/chat/completions",
   ipLimiter,
-  createPreprocessorMiddleware(
+  preprocessOpenAICompatRequest,
-    { inApi: "openai", outApi: "anthropic", service: "anthropic" },
+  anthropicProxy
-    { afterTransform: [maybeReassignModel] }
+);
-  ),
+// 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";
-  const bigModel = process.env.CLAUDE_BIG_MODEL || "claude-v1-100k";
-  const contextSize = req.promptTokens! + req.outputTokens!;
-  if (contextSize > 8500) {
-    req.log.debug(
-      { model: bigModel, contextSize },
-      "Using Claude 100k model for OpenAI-to-Anthropic request"
-    );
-    req.body.model = bigModel;
-  }
 }
 
 export const anthropic = anthropicRouter;

src/proxy/aws.ts

@@ -1,4 +1,4 @@
-import { Request, RequestHandler, Router } from "express";
+import { Request, RequestHandler, Response, Router } from "express";
 import { createProxyMiddleware } from "http-proxy-middleware";
 import { v4 } from "uuid";
 import { config } from "../config";
@@ -16,6 +16,8 @@ import {
   ProxyResHandlerWithBody,
   createOnProxyResHandler,
 } from "./middleware/response";
+import { transformAnthropicChatResponseToAnthropicText } from "./anthropic";
+import { sendErrorToClient } from "./middleware/response/error-generator";
 
 const LATEST_AWS_V2_MINOR_VERSION = "1";
 
@@ -29,10 +31,12 @@ const getModelsResponse = () => {
 
   if (!config.awsCredentials) return { object: "list", data: [] };
 
+  // https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids.html
   const variants = [
-    "anthropic.claude-v1",
     "anthropic.claude-v2",
     "anthropic.claude-v2:1",
+    "anthropic.claude-3-haiku-20240307-v1:0",
+    "anthropic.claude-3-sonnet-20240229-v1:0",
   ];
 
   const models = variants.map((id) => ({
@@ -66,24 +70,26 @@ const awsResponseHandler: ProxyResHandlerWithBody = async (
     throw new Error("Expected body to be an object");
   }
 
-  if (config.promptLogging) {
+  let newBody = body;
-    const host = req.get("host");
+  switch (`${req.inboundApi}<-${req.outboundApi}`) {
-    body.proxy_note = `Prompts are logged on this proxy instance. See ${host} for more information.`;
+    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;
   }
 
-  if (req.inboundApi === "openai") {
+  // AWS does not always confirm the model in the response, so we have to add it
-    req.log.info("Transforming AWS Claude response to OpenAI format");
+  if (!newBody.model && req.body.model) {
-    body = transformAwsResponse(body, req);
+    newBody.model = req.body.model;
   }
 
-  if (req.tokenizerInfo) {
+  res.status(200).json({ ...newBody, proxy: body.proxy });
-    body.proxy_tokenizer = req.tokenizerInfo;
-  }
-
-  // AWS does not confirm the model in the response, so we have to add it
-  body.model = req.body.model;
-
-  res.status(200).json(body);
 };
 
 /**
@@ -92,7 +98,7 @@ const awsResponseHandler: ProxyResHandlerWithBody = async (
  * is only used for non-streaming requests as streaming requests are handled
  * on-the-fly.
  */
-function transformAwsResponse(
+function transformAwsTextResponseToOpenAI(
   awsBody: Record<string, any>,
   req: Request
 ): Record<string, any> {
@@ -139,24 +145,61 @@ const awsProxy = createQueueMiddleware({
   }),
 });
 
+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 chat completion endpoint.
+// Native(ish) Anthropic text completion endpoint.
+awsRouter.post("/v1/complete", ipLimiter, awsTextCompletionRouter, awsProxy);
+// Native Anthropic chat completion endpoint.
 awsRouter.post(
-  "/v1/complete",
+  "/v1/messages",
   ipLimiter,
   createPreprocessorMiddleware(
-    { inApi: "anthropic", outApi: "anthropic", service: "aws" },
+    { 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", service: "aws" },
+    { inApi: "openai", outApi: "anthropic-text", service: "aws" },
     { afterTransform: [maybeReassignModel] }
   ),
   awsProxy
@@ -178,7 +221,8 @@ function maybeReassignModel(req: Request) {
     return;
   }
 
-  const pattern = /^(claude-)?(instant-)?(v)?(\d+)(\.(\d+))?(-\d+k)?$/i;
+  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
@@ -187,7 +231,9 @@ function maybeReassignModel(req: Request) {
     return;
   }
 
-  const [, , instant, , major, , minor] = match;
+  const instant = match[2];
+  const major = match[4];
+  const minor = match[6];
 
   if (instant) {
     req.body.model = "anthropic.claude-instant-v1";
@@ -210,9 +256,52 @@ function maybeReassignModel(req: Request) {
     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",
+        },
+      },
+    });
+  }
+
+  req.body.model = compatModel;
+  next();
+}
+
 export const aws = awsRouter;

src/proxy/azure.ts

@@ -3,9 +3,9 @@ import { createProxyMiddleware } from "http-proxy-middleware";
 import { config } from "../config";
 import { keyPool } from "../shared/key-management";
 import {
-  ModelFamily,
   AzureOpenAIModelFamily,
   getAzureOpenAIModelFamily,
+  ModelFamily,
 } from "../shared/models";
 import { logger } from "../logger";
 import { KNOWN_OPENAI_MODELS } from "./openai";
@@ -80,16 +80,7 @@ const azureOpenaiResponseHandler: ProxyResHandlerWithBody = async (
     throw new Error("Expected body to be an object");
   }
 
-  if (config.promptLogging) {
+  res.status(200).json({ ...body, proxy: body.proxy });
-    const host = req.get("host");
-    body.proxy_note = `Prompts are logged on this proxy instance. See ${host} for more information.`;
-  }
-
-  if (req.tokenizerInfo) {
-    body.proxy_tokenizer = req.tokenizerInfo;
-  }
-
-  res.status(200).json(body);
 };
 
 const azureOpenAIProxy = createQueueMiddleware({
@@ -124,5 +115,15 @@ azureOpenAIRouter.post(
   }),
   azureOpenAIProxy
 );
+azureOpenAIRouter.post(
+  "/v1/images/generations",
+  ipLimiter,
+  createPreprocessorMiddleware({
+    inApi: "openai-image",
+    outApi: "openai-image",
+    service: "azure",
+  }),
+  azureOpenAIProxy
+);
 
 export const azure = azureOpenAIRouter;

src/proxy/gatekeeper.ts

@@ -46,7 +46,15 @@ export const gatekeeper: RequestHandler = (req, res, next) => {
   }
 
   if (GATEKEEPER === "user_token" && token) {
-    const { user, result } = authenticate(token, req.ip);
+    // RisuAI users all come from a handful of aws lambda IPs so we cannot use
+    // 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 { user, result } = authenticate(token, ip);
 
     switch (result) {
       case "success":

src/proxy/google-ai.ts

@@ -0,0 +1,135 @@
+import { Request, RequestHandler, Router } from "express";
+import { createProxyMiddleware } from "http-proxy-middleware";
+import { v4 } from "uuid";
+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";
+
+let modelsCache: any = null;
+let modelsCacheTime = 0;
+
+// https://ai.google.dev/models/gemini
+// TODO: list models https://ai.google.dev/tutorials/rest_quickstart#list_models
+
+const getModelsResponse = () => {
+  if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
+    return modelsCache;
+  }
+
+  if (!config.googleAIKey) return { object: "list", data: [] };
+
+  const googleAIVariants = ["gemini-pro", "gemini-1.0-pro", "gemini-1.5-pro"];
+
+  const models = googleAIVariants.map((id) => ({
+    id,
+    object: "model",
+    created: new Date().getTime(),
+    owned_by: "google",
+    permission: [],
+    root: "google",
+    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 googleAIResponseHandler: 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 === "openai") {
+    req.log.info("Transforming Google AI response to OpenAI format");
+    newBody = transformGoogleAIResponse(body, req);
+  }
+
+  res.status(200).json({ ...newBody, proxy: body.proxy });
+};
+
+function transformGoogleAIResponse(
+  resBody: Record<string, any>,
+  req: Request
+): Record<string, any> {
+  const totalTokens = (req.promptTokens ?? 0) + (req.outputTokens ?? 0);
+  const parts = resBody.candidates[0].content?.parts ?? [{ text: "" }];
+  const content = parts[0].text.replace(/^(.{0,50}?): /, () => "");
+  return {
+    id: "goo-" + 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 },
+        finish_reason: resBody.candidates[0].finishReason,
+        index: 0,
+      },
+    ],
+  };
+}
+
+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 googleAIRouter = Router();
+googleAIRouter.get("/v1/models", handleModelRequest);
+// OpenAI-to-Google AI compatibility endpoint.
+googleAIRouter.post(
+  "/v1/chat/completions",
+  ipLimiter,
+  createPreprocessorMiddleware({
+    inApi: "openai",
+    outApi: "google-ai",
+    service: "google-ai",
+  }),
+  googleAIProxy
+);
+
+export const googleAI = googleAIRouter;

src/proxy/middleware/common.ts

@@ -1,16 +1,21 @@
 import { Request, Response } from "express";
+import http from "http";
 import httpProxy from "http-proxy";
 import { ZodError } from "zod";
 import { generateErrorMessage } from "zod-error";
-import { buildFakeSse } from "../../shared/streaming";
 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";
 const OPENAI_EMBEDDINGS_ENDPOINT = "/v1/embeddings";
 const OPENAI_IMAGE_COMPLETION_ENDPOINT = "/v1/images/generations";
 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";
 
 export function isTextGenerationRequest(req: Request) {
   return (
@@ -19,6 +24,9 @@ export function isTextGenerationRequest(req: Request) {
       OPENAI_CHAT_COMPLETION_ENDPOINT,
       OPENAI_TEXT_COMPLETION_ENDPOINT,
       ANTHROPIC_COMPLETION_ENDPOINT,
+      ANTHROPIC_MESSAGES_ENDPOINT,
+      ANTHROPIC_SONNET_COMPAT_ENDPOINT,
+      ANTHROPIC_OPUS_COMPAT_ENDPOINT,
     ].some((endpoint) => req.path.startsWith(endpoint))
   );
 }
@@ -36,34 +44,30 @@ export function isEmbeddingsRequest(req: Request) {
   );
 }
 
-export function writeErrorResponse(
+export function sendProxyError(
   req: Request,
   res: Response,
   statusCode: number,
+  statusMessage: string,
   errorPayload: Record<string, any>
 ) {
-  const errorSource = errorPayload.error?.type?.startsWith("proxy")
+  const msg =
-    ? "proxy"
+    statusCode === 500
-    : "upstream";
+      ? `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.`;
 
-  // If we're mid-SSE stream, send a data event with the error payload and end
+  sendErrorToClient({
-  // the stream. Otherwise just send a normal error response.
+    options: {
-  if (
+      format: req.inboundApi,
-    res.headersSent ||
+      title: `Proxy error (HTTP ${statusCode} ${statusMessage})`,
-    String(res.getHeader("content-type")).startsWith("text/event-stream")
+      message: `${msg} Further technical details are provided below.`,
-  ) {
+      obj: errorPayload,
-    const errorTitle = `${errorSource} error (${statusCode})`;
+      reqId: req.id,
-    const errorContent = JSON.stringify(errorPayload, null, 2);
+      model: req.body?.model,
-    const msg = buildFakeSse(errorTitle, errorContent, req);
+    },
-    res.write(msg);
+    req,
-    res.write(`data: [DONE]\n\n`);
+    res,
-    res.end();
+  });
-  } else {
-    if (req.tokenizerInfo && typeof errorPayload.error === "object") {
-      errorPayload.error.proxy_tokenizer = req.tokenizerInfo;
-    }
-    res.status(statusCode).json(errorPayload);
-  }
 }
 
 export const handleProxyError: httpProxy.ErrorCallback = (err, req, res) => {
@@ -77,31 +81,65 @@ export const classifyErrorAndSend = (
   res: Response
 ) => {
   try {
-    const { status, userMessage, ...errorDetails } = classifyError(err);
+    const { statusCode, statusMessage, userMessage, ...errorDetails } =
-    writeErrorResponse(req, res, status, {
+      classifyError(err);
+    sendProxyError(req, res, statusCode, statusMessage, {
       error: { message: userMessage, ...errorDetails },
     });
   } catch (error) {
     req.log.error(error, `Error writing error response headers, giving up.`);
+    res.end();
   }
 };
 
 function classifyError(err: Error): {
   /** HTTP status code returned to the client. */
-  status: number;
+  statusCode: number;
+  /** HTTP status message returned to the client. */
+  statusMessage: string;
   /** Message displayed to the user. */
   userMessage: string;
   /** Short error type, e.g. "proxy_validation_error". */
   type: string;
 } & Record<string, any> {
   const defaultError = {
-    status: 500,
+    statusCode: 500,
+    statusMessage: "Internal Server Error",
     userMessage: `Reverse proxy error: ${err.message}`,
     type: "proxy_internal_error",
     stack: err.stack,
   };
 
   switch (err.constructor.name) {
+    case "HttpError":
+      const statusCode = (err as HttpError).status;
+      return {
+        statusCode,
+        statusMessage: `HTTP ${statusCode} ${http.STATUS_CODES[statusCode]}`,
+        userMessage: `Reverse proxy error: ${err.message}`,
+        type: "proxy_http_error",
+      };
+    case "BadRequestError":
+      return {
+        statusCode: 400,
+        statusMessage: "Bad Request",
+        userMessage: `Request is not valid. (${err.message})`,
+        type: "proxy_bad_request",
+      };
+    case "NotFoundError":
+      return {
+        statusCode: 404,
+        statusMessage: "Not Found",
+        userMessage: `Requested resource not found. (${err.message})`,
+        type: "proxy_not_found",
+      };
+    case "PaymentRequiredError":
+      return {
+        statusCode: 402,
+        statusMessage: "No Keys Available",
+        userMessage: err.message,
+        type: "proxy_no_keys_available",
+      };
     case "ZodError":
       const userMessage = generateErrorMessage((err as ZodError).issues, {
         prefix: "Request validation failed. ",
@@ -112,19 +150,33 @@ function classifyError(err: Error): {
           return `At '${rest.pathComponent}': ${issue.message}`;
         },
       });
-      return { status: 400, userMessage, type: "proxy_validation_error" };
+      return {
-    case "ForbiddenError":
+        statusCode: 400,
+        statusMessage: "Bad Request",
+        userMessage,
+        type: "proxy_validation_error",
+      };
+    case "ZoomerForbiddenError":
       // Mimics a ban notice from OpenAI, thrown when blockZoomerOrigins blocks
       // a request.
       return {
-        status: 403,
+        statusCode: 403,
+        statusMessage: "Forbidden",
         userMessage: `Your account has been disabled for violating our terms of service.`,
         type: "organization_account_disabled",
         code: "policy_violation",
       };
+    case "ForbiddenError":
+      return {
+        statusCode: 403,
+        statusMessage: "Forbidden",
+        userMessage: `Request is not allowed. (${err.message})`,
+        type: "proxy_forbidden",
+      };
     case "QuotaExceededError":
       return {
-        status: 429,
+        statusCode: 429,
+        statusMessage: "Too Many Requests",
         userMessage: `You've exceeded your token quota for this model type.`,
         type: "proxy_quota_exceeded",
         info: (err as QuotaExceededError).quotaInfo,
@@ -134,21 +186,24 @@ function classifyError(err: Error): {
         switch (err.code) {
           case "ENOTFOUND":
             return {
-              status: 502,
+              statusCode: 502,
+              statusMessage: "Bad Gateway",
               userMessage: `Reverse proxy encountered a DNS error while trying to connect to the upstream service.`,
               type: "proxy_network_error",
               code: err.code,
             };
           case "ECONNREFUSED":
             return {
-              status: 502,
+              statusCode: 502,
+              statusMessage: "Bad Gateway",
               userMessage: `Reverse proxy couldn't connect to the upstream service.`,
               type: "proxy_network_error",
               code: err.code,
             };
           case "ECONNRESET":
             return {
-              status: 504,
+              statusCode: 504,
+              statusMessage: "Gateway Timeout",
               userMessage: `Reverse proxy timed out while waiting for the upstream service to respond.`,
               type: "proxy_network_error",
               code: err.code,
@@ -165,20 +220,39 @@ export function getCompletionFromBody(req: Request, body: Record<string, any>) {
   const format = req.outboundApi;
   switch (format) {
     case "openai":
-      return body.choices[0].message.content;
+    case "mistral-ai":
+      // Can be null if the model wants to invoke tools rather than return a
+      // completion.
+      return body.choices[0].message.content || "";
     case "openai-text":
       return body.choices[0].text;
-    case "anthropic":
+    case "anthropic-chat":
+      if (!body.content) {
+        req.log.error(
+          { body: JSON.stringify(body) },
+          "Received empty Anthropic chat completion"
+        );
+        return "";
+      }
+      return body.content
+        .map(({ text, type }: { type: string; text: string }) =>
+          type === "text" ? text : `[Unsupported content type: ${type}]`
+        )
+        .join("\n");
+    case "anthropic-text":
       if (!body.completion) {
         req.log.error(
           { body: JSON.stringify(body) },
-          "Received empty Anthropic completion"
+          "Received empty Anthropic text completion"
         );
         return "";
       }
       return body.completion.trim();
-    case "google-palm":
+    case "google-ai":
-      return body.candidates[0].output;
+      if ("choices" in body) {
+        return body.choices[0].message.content;
+      }
+      return body.candidates[0].content.parts[0].text;
     case "openai-image":
       return body.data?.map((item: any) => item.url).join("\n");
     default:
@@ -191,13 +265,15 @@ export function getModelFromBody(req: Request, body: Record<string, any>) {
   switch (format) {
     case "openai":
     case "openai-text":
+    case "mistral-ai":
       return body.model;
     case "openai-image":
       return req.body.model;
-    case "anthropic":
+    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-palm":
+    case "google-ai":
       // Google doesn't confirm the model in the response.
       return req.body.model;
     default:

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

@@ -29,7 +29,9 @@ export const createOnProxyReqHandler = ({
     // 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.
-    req.isStreaming = req.body.stream === true || req.body.stream === "true";
+    // 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 {

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

@@ -7,18 +7,19 @@ import { HPMRequestCallback } from "../index";
  * 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 = (
+export const addAnthropicPreamble: HPMRequestCallback = (_proxyReq, req) => {
-  _proxyReq,
+  if (
-  req
+    !isTextGenerationRequest(req) ||
-) => {
+    req.key?.service !== "anthropic" ||
-  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) {
+  if (req.key.requiresPreamble && prompt) {
     preamble = prompt.startsWith("\n\nHuman:") ? "" : "\n\nHuman:";
     req.log.debug({ key: req.key.hash, preamble }, "Adding preamble to prompt");
   }

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

@@ -3,61 +3,54 @@ import { isEmbeddingsRequest } from "../../common";
 import { HPMRequestCallback } from "../index";
 import { assertNever } from "../../../../shared/utils";
 
-/** Add a key that can service this request to the request object. */
 export const addKey: HPMRequestCallback = (proxyReq, req) => {
   let assignedKey: Key;
+  const { service, inboundApi, outboundApi, body } = req;
 
-  if (!req.inboundApi || !req.outboundApi) {
+  if (!inboundApi || !outboundApi) {
     const err = new Error(
       "Request API format missing. Did you forget to add the request preprocessor to your router?"
     );
-    req.log.error(
+    req.log.error({ inboundApi, outboundApi, path: req.path }, err.message);
-      { in: req.inboundApi, out: req.outboundApi, path: req.path },
-      err.message
-    );
     throw err;
   }
 
-  if (!req.body?.model) {
+  if (!body?.model) {
     throw new Error("You must specify a model with your request.");
   }
 
-  if (req.inboundApi === req.outboundApi) {
+  if (inboundApi === outboundApi) {
-    assignedKey = keyPool.get(req.body.model);
+    assignedKey = keyPool.get(body.model, service);
   } else {
-    switch (req.outboundApi) {
+    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.
-      case "anthropic":
+      // TODO: This whole else condition is probably no longer needed since API
-        assignedKey = keyPool.get("claude-v1");
+      // translation now reassigns the model earlier in the request pipeline.
-        break;
+      case "anthropic-chat":
-      case "google-palm":
+      case "anthropic-text":
-        assignedKey = keyPool.get("text-bison-001");
+        assignedKey = keyPool.get("claude-v1", service);
-        delete req.body.stream;
         break;
       case "openai-text":
-        assignedKey = keyPool.get("gpt-3.5-turbo-instruct");
+        assignedKey = keyPool.get("gpt-3.5-turbo-instruct", service);
+        break;
+      case "openai-image":
+        assignedKey = keyPool.get("dall-e-3", service);
         break;
       case "openai":
+      case "google-ai":
+      case "mistral-ai":
         throw new Error(
-          "OpenAI Chat as an API translation target is not supported"
+          `add-key should not be called for outbound API ${outboundApi}`
         );
-      case "openai-image":
-        assignedKey = keyPool.get("dall-e-3");
-        break;
       default:
-        assertNever(req.outboundApi);
+        assertNever(outboundApi);
     }
   }
 
   req.key = assignedKey;
   req.log.info(
-    {
+    { key: assignedKey.hash, model: body.model, inboundApi, outboundApi },
-      key: assignedKey.hash,
-      model: req.body?.model,
-      fromApi: req.inboundApi,
-      toApi: req.outboundApi,
-    },
     "Assigned key to request"
   );
 
@@ -73,21 +66,16 @@ export const addKey: HPMRequestCallback = (proxyReq, req) => {
       }
       proxyReq.setHeader("Authorization", `Bearer ${assignedKey.key}`);
       break;
-    case "google-palm":
+    case "mistral-ai":
-      const originalPath = proxyReq.path;
+      proxyReq.setHeader("Authorization", `Bearer ${assignedKey.key}`);
-      proxyReq.path = originalPath.replace(
-        /(\?.*)?$/,
-        `?key=${assignedKey.key}`
-      );
       break;
     case "azure":
       const azureKey = assignedKey.key;
       proxyReq.setHeader("api-key", azureKey);
       break;
     case "aws":
-      throw new Error(
+    case "google-ai":
-        "add-key should not be used for AWS security credentials. Use sign-aws-request instead."
+      throw new Error("add-key should not be used for this service.");
-      );
     default:
       assertNever(assignedKey.service);
   }
@@ -113,7 +101,7 @@ export const addKeyForEmbeddingsRequest: HPMRequestCallback = (
 
   req.body = { input: req.body.input, model: "text-embedding-ada-002" };
 
-  const key = keyPool.get("text-embedding-ada-002") as OpenAIKey;
+  const key = keyPool.get("text-embedding-ada-002", "openai") as OpenAIKey;
 
   req.key = key;
   req.log.info(

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

@@ -2,10 +2,10 @@ import { HPMRequestCallback } from "../index";
 
 const DISALLOWED_ORIGIN_SUBSTRINGS = "janitorai.com,janitor.ai".split(",");
 
-class ForbiddenError extends Error {
+class ZoomerForbiddenError extends Error {
   constructor(message: string) {
     super(message);
-    this.name = "ForbiddenError";
+    this.name = "ZoomerForbiddenError";
   }
 }
 
@@ -22,7 +22,7 @@ export const blockZoomerOrigins: HPMRequestCallback = (_proxyReq, req) => {
       return;
     }
 
-    throw new ForbiddenError(
+    throw new ZoomerForbiddenError(
       `Your access was terminated due to violation of our policies, please check your email for more information. If you believe this is in error and would like to appeal, please contact us through our help center at help.openai.com.`
     );
   }

src/proxy/middleware/request/onproxyreq/check-model-family.ts

@@ -1,13 +1,14 @@
 import { HPMRequestCallback } from "../index";
 import { config } from "../../../../config";
+import { ForbiddenError } from "../../../../shared/errors";
 import { getModelFamilyForRequest } from "../../../../shared/models";
 
 /**
  * Ensures the selected model family is enabled by the proxy configuration.
  **/
-export const checkModelFamily: HPMRequestCallback = (proxyReq, req) => {
+export const checkModelFamily: HPMRequestCallback = (_proxyReq, req, res) => {
   const family = getModelFamilyForRequest(req);
   if (!config.allowedModelFamilies.includes(family)) {
-    throw new Error(`Model family ${family} is not permitted on this proxy`);
+    throw new ForbiddenError(`Model family '${family}' is not enabled on this proxy`);
   }
 };

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

@@ -8,6 +8,10 @@ export const finalizeBody: HPMRequestCallback = (proxyReq, req) => {
     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));

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

@@ -1,9 +1,9 @@
 import type { HPMRequestCallback } from "../index";
 
 /**
- * For AWS/Azure requests, the body is signed earlier in the request pipeline,
+ * For AWS/Azure/Google requests, the body is signed earlier in the request
- * before the proxy middleware. This function just assigns the path and headers
+ * pipeline, before the proxy middleware. This function just assigns the path
- * to the proxy request.
+ * and headers to the proxy request.
  */
 export const finalizeSignedRequest: HPMRequestCallback = (proxyReq, req) => {
   if (!req.signedRequest) {

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

@@ -1,4 +1,5 @@
 import { RequestHandler } from "express";
+import { ZodIssue } from "zod";
 import { initializeSseStream } from "../../../shared/streaming";
 import { classifyErrorAndSend } from "../common";
 import {
@@ -9,7 +10,6 @@ import {
   transformOutboundPayload,
   languageFilter,
 } from ".";
-import { ZodIssue } from "zod";
 
 type RequestPreprocessorOptions = {
   /**
@@ -71,6 +71,9 @@ async function executePreprocessors(
   preprocessors: RequestPreprocessor[],
   [req, res, next]: Parameters<RequestHandler>
 ) {
+  handleTestMessage(req, res, next);
+  if (res.headersSent) return;
+
   try {
     for (const preprocessor of preprocessors) {
       await preprocessor(req);
@@ -99,3 +102,57 @@ async function executePreprocessors(
     classifyErrorAndSend(error as Error, req, res);
   }
 }
+
+/**
+ * Bypasses the API call and returns a test message response if the request body
+ * is a known test message from SillyTavern. Otherwise these messages just waste
+ * API request quota and confuse users when the proxy is busy, because ST always
+ * makes them with `stream: false` (which is not allowed when the proxy is busy)
+ */
+const handleTestMessage: RequestHandler = (req, res) => {
+  const { method, body } = req;
+  if (method !== "POST") {
+    return;
+  }
+
+  if (isTestMessage(body)) {
+    req.log.info({ body }, "Received test message. Skipping API call.");
+    res.json({
+      id: "test-message",
+      object: "chat.completion",
+      created: Date.now(),
+      model: body.model,
+      // openai chat
+      choices: [
+        {
+          message: { role: "assistant", content: "Hello!" },
+          finish_reason: "stop",
+          index: 0,
+        },
+      ],
+      // anthropic text
+      completion: "Hello!",
+      // anthropic chat
+      content: [{ type: "text", text: "Hello!" }],
+      proxy_note:
+        "This response was generated by the proxy's test message handler and did not go to the API.",
+    });
+  }
+};
+
+function isTestMessage(body: any) {
+  const { messages, prompt } = body;
+
+  if (messages) {
+    return (
+      messages.length === 1 &&
+      messages[0].role === "user" &&
+      messages[0].content === "Hi"
+    );
+  } else {
+    return (
+      prompt?.trim() === "Human: Hi\n\nAssistant:" ||
+      prompt?.startsWith("Hi\n\n")
+    );
+  }
+}

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

@@ -1,8 +1,15 @@
-import { AzureOpenAIKey, keyPool } from "../../../../shared/key-management";
+import {
+  APIFormat,
+  AzureOpenAIKey,
+  keyPool,
+} from "../../../../shared/key-management";
 import { RequestPreprocessor } from "../index";
 
 export const addAzureKey: RequestPreprocessor = (req) => {
-  const apisValid = req.inboundApi === "openai" && req.outboundApi === "openai";
+  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");
@@ -16,9 +23,25 @@ export const addAzureKey: RequestPreprocessor = (req) => {
     ? req.body.model
     : `azure-${req.body.model}`;
 
-  req.key = keyPool.get(model);
+  req.key = keyPool.get(model, "azure");
   req.body.model = model;
 
+  // Handles the sole Azure API deviation from the OpenAI spec (that I know of)
+  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
+    // Azure seems to just want to combine them into logprobs: number
+    // if (typeof req.body.logprobs === "boolean") {
+    //   req.body.logprobs = req.body.top_logprobs || undefined;
+    //   delete req.body.top_logprobs
+    // }
+
+    // Temporarily just disabling logprobs for Azure because their model support
+    // is random: `This model does not support the 'logprobs' parameter.`
+    delete req.body.logprobs;
+    delete req.body.top_logprobs;
+  }
+
   req.log.info(
     { key: req.key.hash, model },
     "Assigned Azure OpenAI key to request"
@@ -27,11 +50,16 @@ export const addAzureKey: RequestPreprocessor = (req) => {
   const cred = req.key as AzureOpenAIKey;
   const { resourceName, deploymentId, apiKey } = getCredentialsFromKey(cred);
 
+  const operation =
+    req.outboundApi === "openai" ? "/chat/completions" : "/images/generations";
+  const apiVersion =
+    req.outboundApi === "openai" ? "2023-09-01-preview" : "2024-02-15-preview";
+
   req.signedRequest = {
     method: "POST",
     protocol: "https:",
     hostname: `${resourceName}.openai.azure.com`,
-    path: `/openai/deployments/${deploymentId}/chat/completions?api-version=2023-09-01-preview`,
+    path: `/openai/deployments/${deploymentId}${operation}?api-version=${apiVersion}`,
     headers: {
       ["host"]: `${resourceName}.openai.azure.com`,
       ["content-type"]: "application/json",

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

@@ -0,0 +1,40 @@
+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/count-prompt-tokens.ts

@@ -1,7 +1,12 @@
 import { RequestPreprocessor } from "../index";
 import { countTokens } from "../../../../shared/tokenization";
 import { assertNever } from "../../../../shared/utils";
-import type { OpenAIChatMessage } from "./transform-outbound-payload";
+import {
+  AnthropicChatMessage,
+  GoogleAIChatMessage,
+  MistralAIChatMessage,
+  OpenAIChatMessage,
+} from "../../../../shared/api-support";
 
 /**
  * Given a request with an already-transformed body, counts the number of
@@ -24,15 +29,27 @@ export const countPromptTokens: RequestPreprocessor = async (req) => {
       result = await countTokens({ req, prompt, service });
       break;
     }
-    case "anthropic": {
+    case "anthropic-chat": {
+      req.outputTokens = req.body.max_tokens;
+      const prompt: AnthropicChatMessage[] = req.body.messages;
+      result = await countTokens({ req, prompt, service });
+      break;
+    }
+    case "anthropic-text": {
       req.outputTokens = req.body.max_tokens_to_sample;
       const prompt: string = req.body.prompt;
       result = await countTokens({ req, prompt, service });
       break;
     }
-    case "google-palm": {
+    case "google-ai": {
-      req.outputTokens = req.body.maxOutputTokens;
+      req.outputTokens = req.body.generationConfig.maxOutputTokens;
-      const prompt: string = req.body.prompt.text;
+      const prompt: GoogleAIChatMessage[] = req.body.contents;
+      result = await countTokens({ req, prompt, service });
+      break;
+    }
+    case "mistral-ai": {
+      req.outputTokens = req.body.max_tokens;
+      const prompt: MistralAIChatMessage[] = req.body.messages;
       result = await countTokens({ req, prompt, service });
       break;
     }

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

@@ -2,8 +2,12 @@ import { Request } from "express";
 import { config } from "../../../../config";
 import { assertNever } from "../../../../shared/utils";
 import { RequestPreprocessor } from "../index";
-import { UserInputError } from "../../../../shared/errors";
+import { BadRequestError } from "../../../../shared/errors";
-import { OpenAIChatMessage } from "./transform-outbound-payload";
+import {
+  MistralAIChatMessage,
+  OpenAIChatMessage,
+  flattenAnthropicMessages,
+} from "../../../../shared/api-support";
 
 const rejectedClients = new Map<string, number>();
 
@@ -42,7 +46,7 @@ export const languageFilter: RequestPreprocessor = async (req) => {
       req.res!.once("close", resolve);
       setTimeout(resolve, delay);
     });
-    throw new UserInputError(config.rejectMessage);
+    throw new BadRequestError(config.rejectMessage);
   }
 };
 
@@ -50,11 +54,14 @@ function getPromptFromRequest(req: Request) {
   const service = req.outboundApi;
   const body = req.body;
   switch (service) {
-    case "anthropic":
+    case "anthropic-chat":
+      return flattenAnthropicMessages(body.messages);
+    case "anthropic-text":
       return body.prompt;
     case "openai":
+    case "mistral-ai":
       return body.messages
-        .map((msg: OpenAIChatMessage) => {
+        .map((msg: OpenAIChatMessage | MistralAIChatMessage) => {
           const text = Array.isArray(msg.content)
             ? msg.content
                 .map((c) => {
@@ -68,7 +75,7 @@ function getPromptFromRequest(req: Request) {
     case "openai-text":
     case "openai-image":
       return body.prompt;
-    case "google-palm":
+    case "google-ai":
       return body.prompt.text;
     default:
       assertNever(service);

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

@@ -1,13 +1,14 @@
 import { Request } from "express";
-import { APIFormat, LLMService } from "../../../../shared/key-management";
+import { APIFormat } from "../../../../shared/key-management";
+import { LLMService } from "../../../../shared/models";
 import { RequestPreprocessor } from "../index";
 
 export const setApiFormat = (api: {
   inApi: Request["inboundApi"];
   outApi: APIFormat;
-  service: LLMService,
+  service: LLMService;
 }): RequestPreprocessor => {
-  return function configureRequestApiFormat (req) {
+  return function configureRequestApiFormat(req) {
     req.inboundApi = api.inApi;
     req.outboundApi = api.outApi;
     req.service = api.service;

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

@@ -2,9 +2,12 @@ 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-support";
 import { keyPool } from "../../../../shared/key-management";
 import { RequestPreprocessor } from "../index";
-import { AnthropicV1CompleteSchema } from "./transform-outbound-payload";
 
 const AMZ_HOST =
   process.env.AMZ_HOST || "bedrock-runtime.%REGION%.amazonaws.com";
@@ -12,27 +15,50 @@ const AMZ_HOST =
 /**
  * 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) => {
-  req.key = keyPool.get("anthropic.claude-v2");
-
   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 supports only a subset of Anthropic's parameters and is more strict
+  // AWS uses mostly the same parameters as Anthropic, with a few removed params
-  // about unknown parameters.
+  // 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
-  const strippedParams = AnthropicV1CompleteSchema.pick({
+  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,
-  }).parse(req.body);
+    })
+      .strip()
+      .parse(req.body);
+  }
 
   const credential = getCredentialParts(req);
   const host = AMZ_HOST.replace("%REGION%", credential.region);
@@ -60,6 +86,12 @@ export const signAwsRequest: RequestPreprocessor = async (req) => {
     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));
 };
 
@@ -68,6 +100,7 @@ type Credential = {
   secretAccessKey: string;
   region: string;
 };
+
 function getCredentialParts(req: express.Request): Credential {
   const [accessKeyId, secretAccessKey, region] = req.key!.key.split(":");
 

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

@@ -1,151 +1,14 @@
-import { Request } from "express";
+import {
-import { z } from "zod";
+  API_REQUEST_VALIDATORS,
-import { config } from "../../../../config";
+  API_REQUEST_TRANSFORMERS,
-import { isTextGenerationRequest, isImageGenerationRequest } from "../../common";
+} from "../../../../shared/api-support";
+import { BadRequestError } from "../../../../shared/errors";
+import {
+  isImageGenerationRequest,
+  isTextGenerationRequest,
+} from "../../common";
 import { RequestPreprocessor } from "../index";
-import { APIFormat } from "../../../../shared/key-management";
+import { fixMistralPrompt } from "../../../../shared/api-support/kits/mistral-ai/request-transformers";
-
-const CLAUDE_OUTPUT_MAX = config.maxOutputTokensAnthropic;
-const OPENAI_OUTPUT_MAX = config.maxOutputTokensOpenAI;
-
-// TODO: move schemas to shared
-
-// https://console.anthropic.com/docs/api/reference#-v1-complete
-export const AnthropicV1CompleteSchema = z.object({
-  model: z.string(),
-  prompt: z.string({
-    required_error:
-      "No prompt found. Are you sending an OpenAI-formatted request to the Claude endpoint?",
-  }),
-  max_tokens_to_sample: z.coerce
-    .number()
-    .int()
-    .transform((v) => Math.min(v, CLAUDE_OUTPUT_MAX)),
-  stop_sequences: z.array(z.string()).optional(),
-  stream: z.boolean().optional().default(false),
-  temperature: z.coerce.number().optional().default(1),
-  top_k: z.coerce.number().optional(),
-  top_p: z.coerce.number().optional(),
-  metadata: z.any().optional(),
-});
-
-// https://platform.openai.com/docs/api-reference/chat/create
-const OpenAIV1ChatContentArraySchema = z.array(
-  z.union([
-    z.object({ type: z.literal("text"), text: z.string() }),
-    z.object({
-      type: z.literal("image_url"),
-      image_url: z.object({
-        url: z.string().url(),
-        detail: z.enum(["low", "auto", "high"]).optional().default("auto"),
-      }),
-    }),
-  ])
-);
-
-export const OpenAIV1ChatCompletionSchema = z.object({
-  model: z.string(),
-  messages: z.array(
-    z.object({
-      role: z.enum(["system", "user", "assistant"]),
-      content: z.union([z.string(), OpenAIV1ChatContentArraySchema]),
-      name: z.string().optional(),
-    }),
-    {
-      required_error:
-        "No `messages` found. Ensure you've set the correct completion endpoint.",
-      invalid_type_error:
-        "Messages were not formatted correctly. Refer to the OpenAI Chat API documentation for more information.",
-    }
-  ),
-  temperature: z.number().optional().default(1),
-  top_p: z.number().optional().default(1),
-  n: z
-    .literal(1, {
-      errorMap: () => ({
-        message: "You may only request a single completion at a time.",
-      }),
-    })
-    .optional(),
-  stream: z.boolean().optional().default(false),
-  stop: z.union([z.string(), z.array(z.string())]).optional(),
-  max_tokens: z.coerce
-    .number()
-    .int()
-    .nullish()
-    .default(16)
-    .transform((v) => Math.min(v ?? OPENAI_OUTPUT_MAX, OPENAI_OUTPUT_MAX)),
-  frequency_penalty: z.number().optional().default(0),
-  presence_penalty: z.number().optional().default(0),
-  logit_bias: z.any().optional(),
-  user: z.string().optional(),
-  seed: z.number().int().optional(),
-});
-
-export type OpenAIChatMessage = z.infer<
-  typeof OpenAIV1ChatCompletionSchema
->["messages"][0];
-
-const OpenAIV1TextCompletionSchema = z
-  .object({
-    model: z
-      .string()
-      .regex(
-        /^gpt-3.5-turbo-instruct/,
-        "Model must start with 'gpt-3.5-turbo-instruct'"
-      ),
-    prompt: z.string({
-      required_error:
-        "No `prompt` found. Ensure you've set the correct completion endpoint.",
-    }),
-    logprobs: z.number().int().nullish().default(null),
-    echo: z.boolean().optional().default(false),
-    best_of: z.literal(1).optional(),
-    stop: z.union([z.string(), z.array(z.string()).max(4)]).optional(),
-    suffix: z.string().optional(),
-  })
-  .merge(OpenAIV1ChatCompletionSchema.omit({ messages: true }));
-
-// https://platform.openai.com/docs/api-reference/images/create
-const OpenAIV1ImagesGenerationSchema = z.object({
-  prompt: z.string().max(4000),
-  model: z.string().optional(),
-  quality: z.enum(["standard", "hd"]).optional().default("standard"),
-  n: z.number().int().min(1).max(4).optional().default(1),
-  response_format: z.enum(["url", "b64_json"]).optional(),
-  size: z
-    .enum(["256x256", "512x512", "1024x1024", "1792x1024", "1024x1792"])
-    .optional()
-    .default("1024x1024"),
-  style: z.enum(["vivid", "natural"]).optional().default("vivid"),
-  user: z.string().optional(),
-});
-
-// https://developers.generativeai.google/api/rest/generativelanguage/models/generateText
-const PalmV1GenerateTextSchema = z.object({
-  model: z.string(),
-  prompt: z.object({ text: z.string() }),
-  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(),
-  safetySettings: z.array(z.object({})).max(0).optional(),
-  stopSequences: z.array(z.string()).max(5).optional(),
-});
-
-const VALIDATORS: Record<APIFormat, z.ZodSchema<any>> = {
-  anthropic: AnthropicV1CompleteSchema,
-  openai: OpenAIV1ChatCompletionSchema,
-  "openai-text": OpenAIV1TextCompletionSchema,
-  "openai-image": OpenAIV1ImagesGenerationSchema,
-  "google-palm": PalmV1GenerateTextSchema,
-};
 
 /** Transforms an incoming request body to one that matches the target API. */
 export const transformOutboundPayload: RequestPreprocessor = async (req) => {
@@ -156,10 +19,20 @@ export const transformOutboundPayload: RequestPreprocessor = async (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 (sameService) {
-    const result = VALIDATORS[req.inboundApi].safeParse(req.body);
+    const result = API_REQUEST_VALIDATORS[req.inboundApi].safeParse(req.body);
     if (!result.success) {
-      req.log.error(
+      req.log.warn(
         { issues: result.error.issues, body: req.body },
         "Request validation failed"
       );
@@ -169,262 +42,16 @@ export const transformOutboundPayload: RequestPreprocessor = async (req) => {
     return;
   }
 
-  if (req.inboundApi === "openai" && req.outboundApi === "anthropic") {
+  const transformation = `${req.inboundApi}->${req.outboundApi}` as const;
-    req.body = openaiToAnthropic(req);
+  const transFn = API_REQUEST_TRANSFORMERS[transformation];
+
+  if (transFn) {
+    req.log.info({ transformation }, "Transforming request");
+    req.body = await transFn(req);
     return;
   }
 
-  if (req.inboundApi === "openai" && req.outboundApi === "google-palm") {
+  throw new BadRequestError(
-    req.body = openaiToPalm(req);
+    `${transformation} proxying is not supported. Make sure your client is configured to send requests in the correct format and to the correct endpoint.`
-    return;
-  }
-
-  if (req.inboundApi === "openai" && req.outboundApi === "openai-text") {
-    req.body = openaiToOpenaiText(req);
-    return;
-  }
-
-  if (req.inboundApi === "openai" && req.outboundApi === "openai-image") {
-    req.body = openaiToOpenaiImage(req);
-    return;
-  }
-
-  throw new Error(
-    `'${req.inboundApi}' -> '${req.outboundApi}' request proxying is not supported. Make sure your client is configured to use the correct API.`
   );
 };
-
-function openaiToAnthropic(req: Request) {
-  const { body } = req;
-  const result = OpenAIV1ChatCompletionSchema.safeParse(body);
-  if (!result.success) {
-    req.log.warn(
-      { issues: result.error.issues, body },
-      "Invalid OpenAI-to-Anthropic request"
-    );
-    throw result.error;
-  }
-
-  req.headers["anthropic-version"] = "2023-06-01";
-
-  const { messages, ...rest } = result.data;
-  const prompt = openAIMessagesToClaudePrompt(messages);
-
-  let stops = rest.stop
-    ? Array.isArray(rest.stop)
-      ? rest.stop
-      : [rest.stop]
-    : [];
-  // Recommended by Anthropic
-  stops.push("\n\nHuman:");
-  // Helps with jailbreak prompts that send fake system messages and multi-bot
-  // chats that prefix bot messages with "System: Respond as <bot name>".
-  stops.push("\n\nSystem:");
-  // Remove duplicates
-  stops = [...new Set(stops)];
-
-  return {
-    // Model may be overridden in `calculate-context-size.ts` to avoid having
-    // a circular dependency (`calculate-context-size.ts` needs an already-
-    // transformed request body to count tokens, but this function would like
-    // to know the count to select a model).
-    model: process.env.CLAUDE_SMALL_MODEL || "claude-v1",
-    prompt: prompt,
-    max_tokens_to_sample: rest.max_tokens,
-    stop_sequences: stops,
-    stream: rest.stream,
-    temperature: rest.temperature,
-    top_p: rest.top_p,
-  };
-}
-
-function openaiToOpenaiText(req: Request) {
-  const { body } = req;
-  const result = OpenAIV1ChatCompletionSchema.safeParse(body);
-  if (!result.success) {
-    req.log.warn(
-      { issues: result.error.issues, body },
-      "Invalid OpenAI-to-OpenAI-text request"
-    );
-    throw result.error;
-  }
-
-  const { messages, ...rest } = result.data;
-  const prompt = flattenOpenAIChatMessages(messages);
-
-  let stops = rest.stop
-    ? Array.isArray(rest.stop)
-      ? rest.stop
-      : [rest.stop]
-    : [];
-  stops.push("\n\nUser:");
-  stops = [...new Set(stops)];
-
-  const transformed = { ...rest, prompt: prompt, stop: stops };
-  return OpenAIV1TextCompletionSchema.parse(transformed);
-}
-
-// Takes the last chat message and uses it verbatim as the image prompt.
-function openaiToOpenaiImage(req: Request) {
-  const { body } = req;
-  const result = OpenAIV1ChatCompletionSchema.safeParse(body);
-  if (!result.success) {
-    req.log.warn(
-      { issues: result.error.issues, body },
-      "Invalid OpenAI-to-OpenAI-image request"
-    );
-    throw result.error;
-  }
-
-  const { messages } = result.data;
-  const prompt = messages.filter((m) => m.role === "user").pop()?.content;
-  if (Array.isArray(prompt)) {
-    throw new Error("Image generation prompt must be a text message.");
-  }
-
-  if (body.stream) {
-    throw new Error(
-      "Streaming is not supported for image generation requests."
-    );
-  }
-
-  // Some frontends do weird things with the prompt, like prefixing it with a
-  // character name or wrapping the entire thing in quotes. We will look for
-  // the index of "Image:" and use everything after that as the prompt.
-
-  const index = prompt?.toLowerCase().indexOf("image:");
-  if (index === -1 || !prompt) {
-    throw new Error(
-      `Start your prompt with 'Image:' followed by a description of the image you want to generate (received: ${prompt}).`
-    );
-  }
-
-  // TODO: Add some way to specify parameters via chat message
-  const transformed = {
-    model: body.model.includes("dall-e") ? body.model : "dall-e-3",
-    quality: "standard",
-    size: "1024x1024",
-    response_format: "url",
-    prompt: prompt.slice(index! + 6).trim(),
-  };
-  return OpenAIV1ImagesGenerationSchema.parse(transformed);
-}
-
-function openaiToPalm(req: Request): z.infer<typeof PalmV1GenerateTextSchema> {
-  const { body } = req;
-  const result = OpenAIV1ChatCompletionSchema.safeParse({
-    ...body,
-    model: "gpt-3.5-turbo",
-  });
-  if (!result.success) {
-    req.log.warn(
-      { issues: result.error.issues, body },
-      "Invalid OpenAI-to-Palm request"
-    );
-    throw result.error;
-  }
-
-  const { messages, ...rest } = result.data;
-  const prompt = flattenOpenAIChatMessages(messages);
-
-  let stops = rest.stop
-    ? Array.isArray(rest.stop)
-      ? rest.stop
-      : [rest.stop]
-    : [];
-
-  stops.push("\n\nUser:");
-  stops = [...new Set(stops)];
-
-  z.array(z.string()).max(5).parse(stops);
-
-  return {
-    prompt: { text: prompt },
-    maxOutputTokens: rest.max_tokens,
-    stopSequences: stops,
-    model: "text-bison-001",
-    topP: rest.top_p,
-    temperature: rest.temperature,
-    safetySettings: [
-      { category: "HARM_CATEGORY_UNSPECIFIED", threshold: "BLOCK_NONE" },
-      { category: "HARM_CATEGORY_DEROGATORY", threshold: "BLOCK_NONE" },
-      { category: "HARM_CATEGORY_TOXICITY", threshold: "BLOCK_NONE" },
-      { category: "HARM_CATEGORY_VIOLENCE", threshold: "BLOCK_NONE" },
-      { category: "HARM_CATEGORY_SEXUAL", threshold: "BLOCK_NONE" },
-      { category: "HARM_CATEGORY_MEDICAL", threshold: "BLOCK_NONE" },
-      { category: "HARM_CATEGORY_DANGEROUS", threshold: "BLOCK_NONE" },
-    ],
-  };
-}
-
-export function openAIMessagesToClaudePrompt(messages: OpenAIChatMessage[]) {
-  return (
-    messages
-      .map((m) => {
-        let role: string = m.role;
-        if (role === "assistant") {
-          role = "Assistant";
-        } else if (role === "system") {
-          role = "System";
-        } else if (role === "user") {
-          role = "Human";
-        }
-        const name = m.name?.trim();
-        const content = flattenOpenAIMessageContent(m.content);
-        // https://console.anthropic.com/docs/prompt-design
-        // `name` isn't supported by Anthropic but we can still try to use it.
-        return `\n\n${role}: ${name ? `(as ${name}) ` : ""}${content}`;
-      })
-      .join("") + "\n\nAssistant:"
-  );
-}
-
-function flattenOpenAIChatMessages(messages: OpenAIChatMessage[]) {
-  // Temporary to allow experimenting with prompt strategies
-  const PROMPT_VERSION: number = 1;
-  switch (PROMPT_VERSION) {
-    case 1:
-      return (
-        messages
-          .map((m) => {
-            // Claude-style human/assistant turns
-            let role: string = m.role;
-            if (role === "assistant") {
-              role = "Assistant";
-            } else if (role === "system") {
-              role = "System";
-            } else if (role === "user") {
-              role = "User";
-            }
-            return `\n\n${role}: ${flattenOpenAIMessageContent(m.content)}`;
-          })
-          .join("") + "\n\nAssistant:"
-      );
-    case 2:
-      return messages
-        .map((m) => {
-          // Claude without prefixes (except system) and no Assistant priming
-          let role: string = "";
-          if (role === "system") {
-            role = "System: ";
-          }
-          return `\n\n${role}${flattenOpenAIMessageContent(m.content)}`;
-        })
-        .join("");
-    default:
-      throw new Error(`Unknown prompt version: ${PROMPT_VERSION}`);
-  }
-}
-
-function flattenOpenAIMessageContent(
-  content: OpenAIChatMessage["content"]
-): string {
-  return Array.isArray(content)
-    ? content
-        .map((contentItem) => {
-          if ("text" in contentItem) return contentItem.text;
-          if ("image_url" in contentItem) return "[ Uploaded Image Omitted ]";
-        })
-        .join("\n")
-    : content;
-}

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

@@ -6,7 +6,8 @@ import { RequestPreprocessor } from "../index";
 
 const CLAUDE_MAX_CONTEXT = config.maxContextTokensAnthropic;
 const OPENAI_MAX_CONTEXT = config.maxContextTokensOpenAI;
-const BISON_MAX_CONTEXT = 8100;
+const GOOGLE_AI_MAX_CONTEXT = 32000;
+const MISTRAL_AI_MAX_CONTENT = 32768;
 
 /**
  * Assigns `req.promptTokens` and `req.outputTokens` based on the request body
@@ -28,11 +29,15 @@ export const validateContextSize: RequestPreprocessor = async (req) => {
     case "openai-text":
       proxyMax = OPENAI_MAX_CONTEXT;
       break;
-    case "anthropic":
+    case "anthropic-chat":
+    case "anthropic-text":
       proxyMax = CLAUDE_MAX_CONTEXT;
       break;
-    case "google-palm":
+    case "google-ai":
-      proxyMax = BISON_MAX_CONTEXT;
+      proxyMax = GOOGLE_AI_MAX_CONTEXT;
+      break;
+    case "mistral-ai":
+      proxyMax = MISTRAL_AI_MAX_CONTENT;
       break;
     case "openai-image":
       return;
@@ -44,7 +49,9 @@ export const validateContextSize: RequestPreprocessor = async (req) => {
   let modelMax: number;
   if (model.match(/gpt-3.5-turbo-16k/)) {
     modelMax = 16384;
-  } else if (model.match(/gpt-4-1106(-preview)?/)) {
+  } 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)?$/)) {
     modelMax = 131072;
@@ -62,8 +69,16 @@ export const validateContextSize: RequestPreprocessor = async (req) => {
     modelMax = 100000;
   } else if (model.match(/^claude-2/)) {
     modelMax = 200000;
-  } else if (model.match(/^text-bison-\d{3}$/)) {
+  } else if (model.match(/^claude-3/)) {
-    modelMax = BISON_MAX_CONTEXT;
+    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/)) {
+    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;

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

@@ -0,0 +1,339 @@
+import express from "express";
+import { APIFormat } from "../../../shared/key-management";
+import { assertNever } from "../../../shared/utils";
+import { initializeSseStream } from "../../../shared/streaming";
+
+function getMessageContent({
+  title,
+  message,
+  obj,
+}: {
+  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 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${details.stack}\n\`\`\``;
+    delete details.stack;
+  }
+  return `\n\n**${title}**\n${friendlyMessage}${
+    obj ? `\n\`\`\`\n${JSON.stringify(obj, null, 2)}\n\`\`\`\n${stack}` : ""
+  }`;
+}
+
+type ErrorGeneratorOptions = {
+  format: APIFormat | "unknown";
+  title: string;
+  message: string;
+  obj?: object;
+  reqId: string | number | object;
+  model?: string;
+  statusCode?: number;
+};
+
+export function tryInferFormat(body: any): APIFormat | "unknown" {
+  if (typeof body !== "object" || !body.model) {
+    return "unknown";
+  }
+
+  if (body.model.includes("gpt")) {
+    return "openai";
+  }
+
+  if (body.model.includes("mistral")) {
+    return "mistral-ai";
+  }
+
+  if (body.model.includes("claude")) {
+    return body.messages?.length ? "anthropic-chat" : "anthropic-text";
+  }
+
+  if (body.model.includes("gemini")) {
+    return "google-ai";
+  }
+
+  return "unknown";
+}
+
+export function sendErrorToClient({
+  options,
+  req,
+  res,
+}: {
+  options: ErrorGeneratorOptions;
+  req: express.Request;
+  res: express.Response;
+}) {
+  const { format: inputFormat } = 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.
+  const format =
+    inputFormat === "unknown" ? tryInferFormat(req.body) : inputFormat;
+  if (format === "unknown") {
+    return res.status(options.statusCode || 400).json({
+      error: options.message,
+      details: options.obj,
+    });
+  }
+
+  const completion = buildSpoofedCompletion({ ...options, format });
+  const event = buildSpoofedSSE({ ...options, format });
+  const isStreaming =
+    req.isStreaming || req.body.stream === true || req.body.stream === "true";
+
+  if (isStreaming) {
+    if (!res.headersSent) {
+      initializeSseStream(res);
+    }
+    res.write(event);
+    res.write(`data: [DONE]\n\n`);
+    res.end();
+  } else {
+    res.status(200).json(completion);
+  }
+}
+
+/**
+ * Returns a non-streaming completion object that looks like it came from the
+ * service that the request is being proxied to. Used to send error messages to
+ * the client and have them look like normal responses, for clients with poor
+ * error handling.
+ */
+export function buildSpoofedCompletion({
+  format,
+  title,
+  message,
+  obj,
+  reqId,
+  model = "unknown",
+}: ErrorGeneratorOptions & { format: Exclude<APIFormat, "unknown"> }) {
+  const id = String(reqId);
+  const content = getMessageContent({ title, message, obj });
+
+  switch (format) {
+    case "openai":
+    case "mistral-ai":
+      return {
+        id: "error-" + id,
+        object: "chat.completion",
+        created: Date.now(),
+        model,
+        usage: { prompt_tokens: 0, completion_tokens: 0, total_tokens: 0 },
+        choices: [
+          {
+            message: { role: "assistant", content },
+            finish_reason: title,
+            index: 0,
+          },
+        ],
+      };
+    case "openai-text":
+      return {
+        id: "error-" + id,
+        object: "text_completion",
+        created: Date.now(),
+        model,
+        usage: { prompt_tokens: 0, completion_tokens: 0, total_tokens: 0 },
+        choices: [
+          { text: content, index: 0, logprobs: null, finish_reason: title },
+        ],
+      };
+    case "anthropic-text":
+      return {
+        id: "error-" + id,
+        type: "completion",
+        completion: content,
+        stop_reason: title,
+        stop: null,
+        model,
+      };
+    case "anthropic-chat":
+      return {
+        id: "error-" + id,
+        type: "message",
+        role: "assistant",
+        content: [{ type: "text", text: content }],
+        model,
+        stop_reason: title,
+        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" },
+            finishReason: title,
+            index: 0,
+            tokenCount: null,
+            safetyRatings: [],
+          },
+        ],
+      };
+    case "openai-image":
+      return obj;
+    default:
+      assertNever(format);
+  }
+}
+
+/**
+ * Returns an SSE message that looks like a completion event for the service
+ * that the request is being proxied to. Used to send error messages to the
+ * client in the middle of a streaming request.
+ */
+export function buildSpoofedSSE({
+  format,
+  title,
+  message,
+  obj,
+  reqId,
+  model = "unknown",
+}: ErrorGeneratorOptions & { format: Exclude<APIFormat, "unknown"> }) {
+  const id = String(reqId);
+  const content = getMessageContent({ title, message, obj });
+
+  let event;
+
+  switch (format) {
+    case "openai":
+    case "mistral-ai":
+      event = {
+        id: "chatcmpl-" + id,
+        object: "chat.completion.chunk",
+        created: Date.now(),
+        model,
+        choices: [{ delta: { content }, index: 0, finish_reason: title }],
+      };
+      break;
+    case "openai-text":
+      event = {
+        id: "cmpl-" + id,
+        object: "text_completion",
+        created: Date.now(),
+        choices: [
+          { text: content, index: 0, logprobs: null, finish_reason: title },
+        ],
+        model,
+      };
+      break;
+    case "anthropic-text":
+      event = {
+        completion: content,
+        stop_reason: title,
+        truncated: false,
+        stop: null,
+        model,
+        log_id: "proxy-req-" + id,
+      };
+      break;
+    case "anthropic-chat":
+      event = {
+        type: "content_block_delta",
+        index: 0,
+        delta: { type: "text_delta", text: content },
+      };
+      break;
+    case "google-ai":
+      return JSON.stringify({
+        candidates: [
+          {
+            content: { parts: [{ text: content }], role: "model" },
+            finishReason: title,
+            index: 0,
+            tokenCount: null,
+            safetyRatings: [],
+          },
+        ],
+      });
+    case "openai-image":
+      return JSON.stringify(obj);
+    default:
+      assertNever(format);
+  }
+
+  if (format === "anthropic-text") {
+    return (
+      ["event: completion", `data: ${JSON.stringify(event)}`].join("\n") +
+      "\n\n"
+    );
+  }
+
+  // ugh.
+  if (format === "anthropic-chat") {
+    return (
+      [
+        [
+          "event: message_start",
+          `data: ${JSON.stringify({
+            type: "message_start",
+            message: {
+              id: "error-" + id,
+              type: "message",
+              role: "assistant",
+              content: [],
+              model,
+            },
+          })}`,
+        ].join("\n"),
+        [
+          "event: content_block_start",
+          `data: ${JSON.stringify({
+            type: "content_block_start",
+            index: 0,
+            content_block: { type: "text", text: "" },
+          })}`,
+        ].join("\n"),
+        ["event: content_block_delta", `data: ${JSON.stringify(event)}`].join(
+          "\n"
+        ),
+        [
+          "event: content_block_stop",
+          `data: ${JSON.stringify({ type: "content_block_stop", index: 0 })}`,
+        ].join("\n"),
+        [
+          "event: message_delta",
+          `data: ${JSON.stringify({
+            type: "message_delta",
+            delta: { stop_reason: title, stop_sequence: null, usage: null },
+          })}`,
+        ],
+        [
+          "event: message_stop",
+          `data: ${JSON.stringify({ type: "message_stop" })}`,
+        ].join("\n"),
+      ].join("\n\n") + "\n\n"
+    );
+  }
+
+  return `data: ${JSON.stringify(event)}\n\n`;
+}

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

@@ -1,29 +1,38 @@
 import express from "express";
-import { pipeline } from "stream";
+import { pipeline, Readable, Transform } from "stream";
+import StreamArray from "stream-json/streamers/StreamArray";
+import { StringDecoder } from "string_decoder";
 import { promisify } from "util";
+import { APIFormat, keyPool } from "../../../shared/key-management";
 import {
-  buildFakeSse,
   copySseResponseHeaders,
   initializeSseStream,
 } from "../../../shared/streaming";
+import type { logger } from "../../../logger";
 import { enqueue } from "../../queue";
 import { decodeResponseBody, RawResponseBodyHandler, RetryableError } from ".";
-import { SSEStreamAdapter } from "./streaming/sse-stream-adapter";
+import { getAwsEventStreamDecoder } from "./streaming/aws-event-stream-decoder";
-import { SSEMessageTransformer } from "./streaming/sse-message-transformer";
 import { EventAggregator } from "./streaming/event-aggregator";
-import { keyPool } from "../../../shared/key-management";
+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";
 
 const pipelineAsync = promisify(pipeline);
 
 /**
- * Consume the SSE stream and forward events to the client. Once the stream is
+ * `handleStreamedResponse` consumes and transforms a streamed response from the
- * stream is closed, resolve with the full response body so that subsequent
+ * upstream service, forwarding events to the client in their requested format.
- * middleware can work with it.
+ * 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.
  *
- * Typically we would only need of the raw response handlers to execute, but
+ * In the event of an error, the request's streaming flag is unset and the non-
- * in the event a streamed request results in a non-200 response, we need to
+ * streaming response handler is called instead.
- * fall back to the non-streaming response handler so that the error handler
+ *
- * can inspect the error response.
+ * 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,
@@ -44,25 +53,34 @@ export const handleStreamedResponse: RawResponseBodyHandler = async (
     return decodeResponseBody(proxyRes, req, res);
   }
 
-  req.log.debug(
+  req.log.debug({ headers: proxyRes.headers }, `Starting to proxy SSE stream.`);
-    { headers: proxyRes.headers, key: hash },
-    `Starting to proxy SSE stream.`
-  );
 
-  // Users waiting in the queue already have a SSE connection open for the
+  // Typically, streaming will have already been initialized by the request
-  // heartbeat, so we can't always send the stream headers.
+  // queue to send heartbeat pings.
   if (!res.headersSent) {
     copySseResponseHeaders(proxyRes, res);
     initializeSseStream(res);
   }
 
   const prefersNativeEvents = req.inboundApi === req.outboundApi;
-  const contentType = proxyRes.headers["content-type"];
+  const streamOptions = {
+    contentType: proxyRes.headers["content-type"],
+    api: req.outboundApi,
+    logger: req.log,
+  };
 
-  const adapter = new SSEStreamAdapter({ contentType });
+  // Decoder turns the raw response stream into a stream of events in some
+  // format (text/event-stream, vnd.amazon.event-stream, streaming JSON, etc).
+  const decoder = getDecoder({ ...streamOptions, input: proxyRes });
+  // Adapter transforms the decoded events into server-sent events.
+  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({
-    inputFormat: req.outboundApi,
+    inputFormat: req.outboundApi, // The format of the upstream service's events
+    outputFormat: req.inboundApi, // The format the client requested
     inputApiVersion: String(req.headers["anthropic-version"]),
     logger: req.log,
     requestId: String(req.id),
@@ -77,8 +95,11 @@ export const handleStreamedResponse: RawResponseBodyHandler = async (
     });
 
   try {
-    await pipelineAsync(proxyRes, adapter, transformer);
+    await Promise.race([
-    req.log.debug({ key: hash }, `Finished proxying SSE stream.`);
+      handleAbortedStream(req, res),
+      pipelineAsync(proxyRes, decoder, adapter, transformer),
+    ]);
+    req.log.debug(`Finished proxying SSE stream.`);
     res.end();
     return aggregator.getFinalResponse();
   } catch (err) {
@@ -89,12 +110,72 @@ export const handleStreamedResponse: RawResponseBodyHandler = async (
         `Re-enqueueing request due to retryable error during streaming response.`
       );
       req.retryCount++;
-      enqueue(req);
+      await enqueue(req);
+    } else if (err instanceof BadRequestError) {
+      sendErrorToClient({
+        req,
+        res,
+        options: {
+          format: req.inboundApi,
+          title: "Proxy streaming error (Bad Request)",
+          message: `The API returned an error while streaming your request. Your prompt might not be formatted correctly.\n\n*${err.message}*`,
+          reqId: req.id,
+          model: req.body?.model,
+        },
+      });
     } else {
-      const errorEvent = buildFakeSse("stream-error", err.message, req);
+      const { message, stack, lastEvent } = err;
-      res.write(`${errorEvent}data: [DONE]\n\n`);
+      const eventText = JSON.stringify(lastEvent, null, 2) ?? "undefined";
+      const errorEvent = buildSpoofedSSE({
+        format: req.inboundApi,
+        title: "Proxy stream error",
+        message: "An unexpected error occurred while streaming the response.",
+        obj: { message, stack, lastEvent: eventText },
+        reqId: req.id,
+        model: req.body?.model,
+      });
+      res.write(errorEvent);
+      res.write(`data: [DONE]\n\n`);
       res.end();
     }
     throw err;
   }
 };
+
+function handleAbortedStream(req: express.Request, res: express.Response) {
+  return new Promise<void>((resolve) =>
+    res.on("close", () => {
+      if (!res.writableEnded) {
+        req.log.info("Client prematurely closed connection during stream.");
+      }
+      resolve();
+    })
+  );
+}
+
+function getDecoder(options: {
+  input: Readable;
+  api: APIFormat;
+  logger: typeof logger;
+  contentType?: string;
+}) {
+  const { api, contentType, input, logger } = options;
+  if (contentType?.includes("application/vnd.amazon.eventstream")) {
+    return getAwsEventStreamDecoder({ input, logger });
+  } else if (api === "google-ai") {
+    return StreamArray.withParser();
+  } else {
+    // Passthrough stream, but ensures split chunks across multi-byte characters
+    // are handled correctly.
+    const stringDecoder = new StringDecoder("utf8");
+    return new Transform({
+      readableObjectMode: true,
+      writableObjectMode: false,
+      transform(chunk, _encoding, callback) {
+        const text = stringDecoder.write(chunk);
+        if (text) this.push(text);
+        callback();
+      },
+    });
+  }
+}

src/proxy/middleware/response/index.ts

@@ -18,11 +18,12 @@ import {
   getCompletionFromBody,
   isImageGenerationRequest,
   isTextGenerationRequest,
-  writeErrorResponse,
+  sendProxyError,
 } from "../common";
 import { handleStreamedResponse } from "./handle-streamed-response";
 import { logPrompt } from "./log-prompt";
 import { saveImage } from "./save-image";
+import { config } from "../../../config";
 
 const DECODER_MAP = {
   gzip: util.promisify(zlib.gunzip),
@@ -105,6 +106,7 @@ export const createOnProxyResHandler = (apiMiddleware: ProxyResMiddleware) => {
       } else {
         middlewareStack.push(
           trackRateLimit,
+          addProxyInfo,
           handleUpstreamErrors,
           countResponseTokens,
           incrementUsage,
@@ -152,13 +154,13 @@ export const createOnProxyResHandler = (apiMiddleware: ProxyResMiddleware) => {
   };
 };
 
-function reenqueueRequest(req: Request) {
+async function reenqueueRequest(req: Request) {
   req.log.info(
     { key: req.key?.hash, retryCount: req.retryCount },
     `Re-enqueueing request due to retryable error`
   );
   req.retryCount++;
-  enqueue(req);
+  await enqueue(req);
 }
 
 /**
@@ -188,15 +190,17 @@ export const decodeResponseBody: RawResponseBodyHandler = async (
       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 errorMessage = `Proxy received response with unsupported content-encoding: ${contentEncoding}`;
+          const error = `Proxy received response with unsupported content-encoding: ${contentEncoding}`;
-          req.log.warn({ contentEncoding, key: req.key?.hash }, errorMessage);
+          req.log.warn({ contentEncoding, key: req.key?.hash }, error);
-          writeErrorResponse(req, res, 500, {
+          sendProxyError(req, res, 500, "Internal Server Error", {
-            error: errorMessage,
+            error,
             contentEncoding,
           });
-          return reject(errorMessage);
+          return reject(error);
         }
       }
 
@@ -206,11 +210,11 @@ export const decodeResponseBody: RawResponseBodyHandler = async (
           return resolve(json);
         }
         return resolve(body.toString());
-      } catch (error: any) {
+      } catch (e) {
-        const errorMessage = `Proxy received response with invalid JSON: ${error.message}`;
+        const msg = `Proxy received response with invalid JSON: ${e.message}`;
-        req.log.warn({ error: error.stack, key: req.key?.hash }, errorMessage);
+        req.log.warn({ error: e.stack, key: req.key?.hash }, msg);
-        writeErrorResponse(req, res, 500, { error: errorMessage });
+        sendProxyError(req, res, 500, "Internal Server Error", { error: msg });
-        return reject(errorMessage);
+        return reject(msg);
       }
     });
   });
@@ -237,6 +241,7 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
   body
 ) => {
   const statusCode = proxyRes.statusCode || 500;
+  const statusMessage = proxyRes.statusMessage || "Internal Server Error";
 
   if (statusCode < 400) {
     return;
@@ -253,16 +258,16 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
   } catch (parseError) {
     // Likely Bad Gateway or Gateway Timeout from upstream's reverse proxy
     const hash = req.key?.hash;
-    const statusMessage = proxyRes.statusMessage || "Unknown error";
     req.log.warn({ statusCode, statusMessage, key: hash }, parseError.message);
 
     const errorObject = {
-      statusCode,
-      statusMessage: proxyRes.statusMessage,
       error: parseError.message,
-      proxy_note: `This is likely a temporary error with the upstream service.`,
+      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.`,
     };
-    writeErrorResponse(req, res, statusCode, errorObject);
+
+    sendProxyError(req, res, statusCode, statusMessage, errorObject);
     throw new HttpError(statusCode, parseError.message);
   }
 
@@ -288,7 +293,8 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
     // For Anthropic, this is usually due to missing preamble.
     switch (service) {
       case "openai":
-      case "google-palm":
+      case "google-ai":
+      case "mistral-ai":
       case "azure":
         const filteredCodes = ["content_policy_violation", "content_filter"];
         if (filteredCodes.includes(errorPayload.error?.code)) {
@@ -297,14 +303,14 @@ 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.
-          handleOpenAIRateLimitError(req, tryAgainMessage, errorPayload);
+          await handleOpenAIRateLimitError(req, tryAgainMessage, errorPayload);
         } else {
           errorPayload.proxy_note = `The upstream API rejected the request. Your prompt may be too long for ${req.body?.model}.`;
         }
         break;
       case "anthropic":
       case "aws":
-        maybeHandleMissingPreambleError(req, errorPayload);
+        await handleAnthropicBadRequestError(req, errorPayload);
         break;
       default:
         assertNever(service);
@@ -314,7 +320,11 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
     keyPool.disable(req.key!, "revoked");
     errorPayload.proxy_note = `API key is invalid or revoked. ${tryAgainMessage}`;
   } else if (statusCode === 403) {
-    // Amazon is the only service that returns 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.
@@ -322,12 +332,16 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
         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."
           );
           keyPool.disable(req.key!, "revoked");
-        errorPayload.proxy_note = `API key doesn't have access to the requested resource.`;
+        }
+        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.`;
@@ -335,19 +349,20 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
   } else if (statusCode === 429) {
     switch (service) {
       case "openai":
-        handleOpenAIRateLimitError(req, tryAgainMessage, errorPayload);
+        await handleOpenAIRateLimitError(req, tryAgainMessage, errorPayload);
         break;
       case "anthropic":
-        handleAnthropicRateLimitError(req, errorPayload);
+        await handleAnthropicRateLimitError(req, errorPayload);
         break;
       case "aws":
-        handleAwsRateLimitError(req, errorPayload);
+        await handleAwsRateLimitError(req, errorPayload);
         break;
       case "azure":
-        handleAzureRateLimitError(req, errorPayload);
+      case "mistral-ai":
+        await handleAzureRateLimitError(req, errorPayload);
         break;
-      case "google-palm":
+      case "google-ai":
-        errorPayload.proxy_note = `Automatic rate limit retries are not supported for this service. Try again in a few seconds.`;
+        await handleGoogleAIRateLimitError(req, errorPayload);
         break;
       default:
         assertNever(service);
@@ -369,8 +384,11 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
       case "anthropic":
         errorPayload.proxy_note = `The requested Claude model might not exist, or the key might not be provisioned for it.`;
         break;
-      case "google-palm":
+      case "google-ai":
-        errorPayload.proxy_note = `The requested Google PaLM model might not exist, or the key might not be provisioned for it.`;
+        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.`;
@@ -393,63 +411,75 @@ const handleUpstreamErrors: ProxyResHandlerWithBody = async (
     );
   }
 
-  writeErrorResponse(req, res, statusCode, errorPayload);
+  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.
   throw new HttpError(statusCode, errorPayload.error?.message);
 };
 
-/**
+async function handleAnthropicBadRequestError(
- * This is a workaround for a very strange issue where certain API keys seem to
- * enforce more strict input validation than others -- specifically, they will
- * require a `\n\nHuman:` prefix on the prompt, perhaps to prevent the key from
- * being used as a generic text completion service and to enforce the use of
- * the chat RLHF.  This is not documented anywhere, and it's not clear why some
- * keys enforce this and others don't.
- * This middleware checks for that specific error and marks the key as being
- * one that requires the prefix, and then re-enqueues the request.
- * The exact error is:
- * ```
- * {
- *   "error": {
- *     "type": "invalid_request_error",
- *     "message": "prompt must start with \"\n\nHuman:\" turn"
- *   }
- * }
- * ```
- */
-function maybeHandleMissingPreambleError(
   req: Request,
   errorPayload: ProxiedErrorPayload
 ) {
-  if (
+  const { error } = errorPayload;
-    errorPayload.error?.type === "invalid_request_error" &&
+  const isMissingPreamble = error?.message.startsWith(
-    errorPayload.error?.message === 'prompt must start with "\n\nHuman:" turn'
+    `prompt must start with "\n\nHuman:" turn`
-  ) {
+  );
+
+  // Some keys mandate a \n\nHuman: preamble, which we can add and retry
+  if (isMissingPreamble) {
     req.log.warn(
       { key: req.key?.hash },
       "Request failed due to missing preamble. Key will be marked as such for subsequent requests."
     );
     keyPool.update(req.key!, { requiresPreamble: true });
-    reenqueueRequest(req);
+    await reenqueueRequest(req);
     throw new RetryableError("Claude request re-enqueued to add preamble.");
-  } else {
-    errorPayload.proxy_note = `Proxy received unrecognized error from Anthropic. Check the specific error for more information.`;
   }
+
+  // {"type":"error","error":{"type":"invalid_request_error","message":"Usage blocked until 2024-03-01T00:00:00+00:00 due to user specified spend limits."}}
+  // {"type":"error","error":{"type":"invalid_request_error","message":"Your credit balance is too low to access the Claude API. Please go to Plans & Billing to upgrade or purchase credits."}}
+  const isOverQuota =
+    error?.message?.match(/usage blocked until/i) ||
+    error?.message?.match(/credit balance is too low/i);
+  if (isOverQuota) {
+    req.log.warn(
+      { key: req.key?.hash, message: error?.message },
+      "Anthropic key has hit spending limit and will be disabled."
+    );
+    keyPool.disable(req.key!, "quota");
+    errorPayload.proxy_note = `Assigned key has hit its spending limit. ${error?.message}`;
+    return;
+  }
+
+  const isDisabled = error?.message?.match(/organization has been disabled/i);
+  if (isDisabled) {
+    req.log.warn(
+      { key: req.key?.hash, message: error?.message },
+      "Anthropic key has been disabled."
+    );
+    keyPool.disable(req.key!, "revoked");
+    errorPayload.proxy_note = `Assigned key has been disabled. ${error?.message}`;
+    return;
+  }
+
+  errorPayload.proxy_note = `Unrecognized error from the API. (${error?.message})`;
 }
 
-function handleAnthropicRateLimitError(
+async function handleAnthropicRateLimitError(
   req: Request,
   errorPayload: ProxiedErrorPayload
 ) {
   if (errorPayload.error?.type === "rate_limit_error") {
     keyPool.markRateLimited(req.key!);
-    reenqueueRequest(req);
+    await reenqueueRequest(req);
     throw new RetryableError("Claude rate-limited request re-enqueued.");
   } else {
-    errorPayload.proxy_note = `Unrecognized rate limit error from Anthropic. Key may be over quota.`;
+    errorPayload.proxy_note = `Unrecognized 429 Too Many Requests error from the API.`;
   }
 }
 
-function handleAwsRateLimitError(
+async function handleAwsRateLimitError(
   req: Request,
   errorPayload: ProxiedErrorPayload
 ) {
@@ -457,7 +487,7 @@ function handleAwsRateLimitError(
   switch (errorType) {
     case "ThrottlingException":
       keyPool.markRateLimited(req.key!);
-      reenqueueRequest(req);
+      await reenqueueRequest(req);
       throw new RetryableError("AWS rate-limited request re-enqueued.");
     case "ModelNotReadyException":
       errorPayload.proxy_note = `The requested model is overloaded. Try again in a few seconds.`;
@@ -467,11 +497,11 @@ function handleAwsRateLimitError(
   }
 }
 
-function handleOpenAIRateLimitError(
+async function handleOpenAIRateLimitError(
   req: Request,
   tryAgainMessage: string,
   errorPayload: ProxiedErrorPayload
-): Record<string, any> {
+): Promise<Record<string, any>> {
   const type = errorPayload.error?.type;
   switch (type) {
     case "insufficient_quota":
@@ -500,8 +530,58 @@ function handleOpenAIRateLimitError(
       }
 
       // Per-minute request or token rate limit is exceeded, which we can retry
-      reenqueueRequest(req);
+      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.`;
       break;
@@ -509,7 +589,7 @@ function handleOpenAIRateLimitError(
   return errorPayload;
 }
 
-function handleAzureRateLimitError(
+async function handleAzureRateLimitError(
   req: Request,
   errorPayload: ProxiedErrorPayload
 ) {
@@ -517,7 +597,7 @@ function handleAzureRateLimitError(
   switch (code) {
     case "429":
       keyPool.markRateLimited(req.key!);
-      reenqueueRequest(req);
+      await reenqueueRequest(req);
       throw new RetryableError("Rate-limited request re-enqueued.");
     default:
       errorPayload.proxy_note = `Unrecognized rate limit error from Azure (${code}). Please report this.`;
@@ -525,6 +605,23 @@ function handleAzureRateLimitError(
   }
 }
 
+//{"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;
+  switch (status) {
+    case "RESOURCE_EXHAUSTED":
+      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;
+  }
+}
+
 const incrementUsage: ProxyResHandlerWithBody = async (_proxyRes, req) => {
   if (isTextGenerationRequest(req) || isImageGenerationRequest(req)) {
     const model = req.body.model;
@@ -611,6 +708,38 @@ const copyHttpHeaders: ProxyResHandlerWithBody = async (
   });
 };
 
+/**
+ * Injects metadata into the response, such as the tokenizer used, logging
+ * status, upstream API endpoint used, and whether the input prompt was modified
+ * or transformed.
+ * Only used for non-streaming requests.
+ */
+const addProxyInfo: ProxyResHandlerWithBody = async (
+  _proxyRes,
+  req,
+  res,
+  body
+) => {
+  const { service, inboundApi, outboundApi, tokenizerInfo } = req;
+  const native = inboundApi === outboundApi;
+  const info: any = {
+    logged: config.promptLogging,
+    tokens: tokenizerInfo,
+    service,
+    in_api: inboundApi,
+    out_api: outboundApi,
+    prompt_transformed: !native,
+  };
+
+  if (req.query?.debug?.length) {
+    info.final_request_body = req.signedRequest?.body || req.body;
+  }
+
+  if (typeof body === "object") {
+    body.proxy = info;
+  }
+};
+
 function getAwsErrorType(header: string | string[] | undefined) {
   const val = String(header).match(/^(\w+):?/)?.[1];
   return val || String(header);

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

@@ -9,7 +9,13 @@ import {
 } from "../common";
 import { ProxyResHandlerWithBody } from ".";
 import { assertNever } from "../../../shared/utils";
-import { OpenAIChatMessage } from "../request/preprocessors/transform-outbound-payload";
+import {
+  AnthropicChatMessage,
+  flattenAnthropicMessages,
+  MistralAIChatMessage,
+  OpenAIChatMessage,
+} from "../../../shared/api-support";
+import { APIFormat } from "../../../shared/key-management";
 
 /** If prompt logging is enabled, enqueues the prompt for logging. */
 export const logPrompt: ProxyResHandlerWithBody = async (
@@ -30,7 +36,7 @@ export const logPrompt: ProxyResHandlerWithBody = async (
   if (!loggable) return;
 
   const promptPayload = getPromptForRequest(req, responseBody);
-  const promptFlattened = flattenMessages(promptPayload);
+  const promptFlattened = flattenMessages(promptPayload, req.outboundApi);
   const response = getCompletionFromBody(req, responseBody);
   const model = getModelFromBody(req, responseBody);
 
@@ -54,12 +60,19 @@ type OaiImageResult = {
 const getPromptForRequest = (
   req: Request,
   responseBody: Record<string, any>
-): string | OpenAIChatMessage[] | OaiImageResult => {
+):
+  | string
+  | OpenAIChatMessage[]
+  | AnthropicChatMessage[]
+  | MistralAIChatMessage[]
+  | OaiImageResult => {
   // Since the prompt logger only runs after the request has been proxied, we
   // can assume the body has already been transformed to the target API's
   // format.
   switch (req.outboundApi) {
     case "openai":
+    case "mistral-ai":
+    case "anthropic-chat":
       return req.body.messages;
     case "openai-text":
       return req.body.prompt;
@@ -71,9 +84,9 @@ const getPromptForRequest = (
         quality: req.body.quality,
         revisedPrompt: responseBody.data[0].revised_prompt,
       };
-    case "anthropic":
+    case "anthropic-text":
       return req.body.prompt;
-    case "google-palm":
+    case "google-ai":
       return req.body.prompt.text;
     default:
       assertNever(req.outboundApi);
@@ -81,11 +94,20 @@ const getPromptForRequest = (
 };
 
 const flattenMessages = (
-  val: string | OpenAIChatMessage[] | OaiImageResult
+  val:
+    | string
+    | OaiImageResult
+    | OpenAIChatMessage[]
+    | AnthropicChatMessage[]
+    | MistralAIChatMessage[],
+  format: APIFormat
 ): string => {
   if (typeof val === "string") {
     return val.trim();
   }
+  if (format === "anthropic-chat") {
+    return flattenAnthropicMessages(val as AnthropicChatMessage[]);
+  }
   if (Array.isArray(val)) {
     return val
       .map(({ content, role }) => {
@@ -94,6 +116,8 @@ const flattenMessages = (
               .map((c) => {
                 if ("text" in c) return c.text;
                 if ("image_url" in c) return "(( Attached Image ))";
+                if ("source" in c) return "(( Attached Image ))";
+                return "(( Unsupported Content ))";
               })
               .join("\n")
           : content;

src/proxy/middleware/response/save-image.ts

@@ -1,11 +1,14 @@
 import { ProxyResHandlerWithBody } from "./index";
-import { mirrorGeneratedImage, OpenAIImageGenerationResult } from "../../../shared/file-storage/mirror-generated-image";
+import {
+  mirrorGeneratedImage,
+  OpenAIImageGenerationResult,
+} from "../../../shared/file-storage/mirror-generated-image";
 
 export const saveImage: ProxyResHandlerWithBody = async (
   _proxyRes,
   req,
   _res,
-  body,
+  body
 ) => {
   if (req.outboundApi !== "openai-image") {
     return;
@@ -16,12 +19,15 @@ export const saveImage: ProxyResHandlerWithBody = async (
   }
 
   if (body.data) {
-    const baseUrl = req.protocol + "://" + req.get("host");
     const prompt = body.data[0].revised_prompt ?? req.body.prompt;
-    await mirrorGeneratedImage(
+    const res = await mirrorGeneratedImage(
-      baseUrl,
+      req,
       prompt,
       body as OpenAIImageGenerationResult
     );
+    req.log.info(
+      { urls: res.data.map((item) => item.url) },
+      "Saved generated image to user_content"
+    );
   }
 };

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

@@ -0,0 +1,49 @@
+import { OpenAIChatCompletionStreamEvent } from "../index";
+
+export type AnthropicChatCompletionResponse = {
+  id: string;
+  type: "message";
+  role: "assistant";
+  content: { type: "text"; text: string }[];
+  model: string;
+  stop_reason: string | null;
+  stop_sequence: string | null;
+  usage: { input_tokens: number; output_tokens: number };
+};
+
+/**
+ * Given a list of OpenAI chat completion events, compiles them into a single
+ * finalized Anthropic chat completion response so that non-streaming middleware
+ * can operate on it as if it were a blocking response.
+ */
+export function mergeEventsForAnthropicChat(
+  events: OpenAIChatCompletionStreamEvent[]
+): AnthropicChatCompletionResponse {
+  let merged: AnthropicChatCompletionResponse = {
+    id: "",
+    type: "message",
+    role: "assistant",
+    content: [],
+    model: "",
+    stop_reason: null,
+    stop_sequence: null,
+    usage: { input_tokens: 0, output_tokens: 0 },
+  };
+  merged = events.reduce((acc, event, i) => {
+    // The first event will only contain role assignment and response metadata
+    if (i === 0) {
+      acc.id = event.id;
+      acc.model = event.model;
+      acc.content = [{ type: "text", text: "" }];
+      return acc;
+    }
+
+    acc.stop_reason = event.choices[0].finish_reason ?? "";
+    if (event.choices[0].delta.content) {
+      acc.content[0].text += event.choices[0].delta.content;
+    }
+
+    return acc;
+  }, merged);
+  return merged;
+}

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

@@ -1,6 +1,6 @@
 import { OpenAIChatCompletionStreamEvent } from "../index";
 
-export type AnthropicCompletionResponse = {
+export type AnthropicTextCompletionResponse = {
   completion: string;
   stop_reason: string;
   truncated: boolean;
@@ -15,10 +15,10 @@ export type AnthropicCompletionResponse = {
  * finalized Anthropic completion response so that non-streaming middleware
  * can operate on it as if it were a blocking response.
  */
-export function mergeEventsForAnthropic(
+export function mergeEventsForAnthropicText(
   events: OpenAIChatCompletionStreamEvent[]
-): AnthropicCompletionResponse {
+): AnthropicTextCompletionResponse {
-  let merged: AnthropicCompletionResponse = {
+  let merged: AnthropicTextCompletionResponse = {
     log_id: "",
     exception: null,
     model: "",

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

@@ -0,0 +1,93 @@
+import pino from "pino";
+import { Duplex, Readable } from "stream";
+import { EventStreamMarshaller } from "@smithy/eventstream-serde-node";
+import { fromUtf8, toUtf8 } from "@smithy/util-utf8";
+import { Message } from "@smithy/eventstream-codec";
+
+/**
+ * Decodes a Readable stream, such as a proxied HTTP response, into a stream of
+ * Message objects using the AWS SDK's EventStreamMarshaller. Error events in
+ * the amazon eventstream protocol are decoded as Message objects and will not
+ * emit an error event on the decoder stream.
+ */
+export function getAwsEventStreamDecoder(params: {
+  input: Readable;
+  logger: pino.Logger;
+}): Duplex {
+  const { input, logger } = params;
+  const config = { utf8Encoder: toUtf8, utf8Decoder: fromUtf8 };
+  const eventStream = new EventStreamMarshaller(config).deserialize(
+    input,
+    async (input: Record<string, Message>) => {
+      const eventType = Object.keys(input)[0];
+      let result;
+      if (eventType === "chunk") {
+        result = input[eventType];
+      } else {
+        // AWS unmarshaller treats non-chunk (errors and exceptions) oddly.
+        result = { [eventType]: input[eventType] } as any;
+      }
+      return result;
+    }
+  );
+  return new AWSEventStreamDecoder(eventStream, { logger });
+}
+
+class AWSEventStreamDecoder extends Duplex {
+  private readonly asyncIterable: AsyncIterable<Message>;
+  private iterator: AsyncIterator<Message>;
+  private reading: boolean;
+  private logger: pino.Logger;
+
+  constructor(
+    asyncIterable: AsyncIterable<Message>,
+    options: { logger: pino.Logger }
+  ) {
+    super({ ...options, objectMode: true });
+    this.asyncIterable = asyncIterable;
+    this.iterator = this.asyncIterable[Symbol.asyncIterator]();
+    this.reading = false;
+    this.logger = options.logger.child({ module: "aws-eventstream-decoder" });
+  }
+
+  async _read(_size: number) {
+    if (this.reading) return;
+    this.reading = true;
+
+    try {
+      while (true) {
+        const { value, done } = await this.iterator.next();
+        if (done) {
+          this.push(null);
+          break;
+        }
+        if (!this.push(value)) break;
+      }
+    } catch (err) {
+      // AWS SDK's EventStreamMarshaller emits errors in the stream itself as
+      // whatever our deserializer returns, which will not be Error objects
+      // because we want to pass the Message to the next stream for processing.
+      // Any actual Error thrown here is some failure during deserialization.
+      const isAwsError = !(err instanceof Error);
+
+      if (isAwsError) {
+        this.logger.warn({ err: err.headers }, "Received AWS error event");
+        this.push(err);
+        this.push(null);
+      } else {
+        this.logger.error(err, "Error during AWS stream deserialization");
+        this.destroy(err);
+      }
+    } finally {
+      this.reading = false;
+    }
+  }
+
+  _write(_chunk: any, _encoding: string, callback: () => void) {
+    callback();
+  }
+
+  _final(callback: () => void) {
+    callback();
+  }
+}

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

@@ -1,10 +1,13 @@
 import { APIFormat } from "../../../../shared/key-management";
 import { assertNever } from "../../../../shared/utils";
 import {
-  mergeEventsForAnthropic,
+  anthropicV2ToOpenAI,
+  mergeEventsForAnthropicChat,
+  mergeEventsForAnthropicText,
   mergeEventsForOpenAIChat,
   mergeEventsForOpenAIText,
-  OpenAIChatCompletionStreamEvent
+  AnthropicV2StreamEvent,
+  OpenAIChatCompletionStreamEvent,
 } from "./index";
 
 /**
@@ -20,19 +23,44 @@ export class EventAggregator {
     this.format = format;
   }
 
-  addEvent(event: OpenAIChatCompletionStreamEvent) {
+  addEvent(event: OpenAIChatCompletionStreamEvent | AnthropicV2StreamEvent) {
+    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);
+      }
+    }
   }
 
   getFinalResponse() {
     switch (this.format) {
       case "openai":
+      case "google-ai":
+      case "mistral-ai":
         return mergeEventsForOpenAIChat(this.events);
       case "openai-text":
         return mergeEventsForOpenAIText(this.events);
-      case "anthropic":
+      case "anthropic-text":
-        return mergeEventsForAnthropic(this.events);
+        return mergeEventsForAnthropicText(this.events);
-      case "google-palm":
+      case "anthropic-chat":
+        return mergeEventsForAnthropicChat(this.events);
       case "openai-image":
         throw new Error(`SSE aggregation not supported for ${this.format}`);
       default:
@@ -40,3 +68,9 @@ export class EventAggregator {
     }
   }
 }
+
+function eventIsOpenAIEvent(
+  event: any
+): event is OpenAIChatCompletionStreamEvent {
+  return event?.object === "chat.completion.chunk";
+}

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

@@ -1,9 +1,17 @@
-export type SSEResponseTransformArgs = {
+export type SSEResponseTransformArgs<S = Record<string, any>> = {
   data: string;
   lastPosition: number;
   index: number;
   fallbackId: string;
   fallbackModel: string;
+  state?: S;
+};
+
+export type AnthropicV2StreamEvent = {
+  log_id?: string;
+  model?: string;
+  completion: string;
+  stop_reason: string | null;
 };
 
 export type OpenAIChatCompletionStreamEvent = {
@@ -16,15 +24,25 @@ export type OpenAIChatCompletionStreamEvent = {
     delta: { role?: string; content?: string };
     finish_reason: string | null;
   }[];
-}
+};
 
-export type StreamingCompletionTransformer = (
+export type StreamingCompletionTransformer<
-  params: SSEResponseTransformArgs
+  T = OpenAIChatCompletionStreamEvent,
-) => { position: number; event?: OpenAIChatCompletionStreamEvent };
+  S = any,
+> = (params: SSEResponseTransformArgs<S>) => {
+  position: number;
+  event?: T;
+  state?: S;
+};
 
 export { openAITextToOpenAIChat } from "./transformers/openai-text-to-openai";
 export { anthropicV1ToOpenAI } from "./transformers/anthropic-v1-to-openai";
 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 { passthroughToOpenAI } from "./transformers/passthrough-to-openai";
 export { mergeEventsForOpenAIChat } from "./aggregators/openai-chat";
 export { mergeEventsForOpenAIText } from "./aggregators/openai-text";
-export { mergeEventsForAnthropic } from "./aggregators/anthropic";
+export { mergeEventsForAnthropicText } from "./aggregators/anthropic-text";
+export { mergeEventsForAnthropicChat } from "./aggregators/anthropic-chat";

src/proxy/middleware/response/streaming/parse-sse.ts

@@ -3,27 +3,27 @@ export type ServerSentEvent = { id?: string; type?: string; data: string };
 /** Given a string of SSE data, parse it into a `ServerSentEvent` object. */
 export function parseEvent(event: string) {
   const buffer: ServerSentEvent = { data: "" };
-  return event.split(/\r?\n/).reduce(parseLine, buffer)
+  return event.split(/\r?\n/).reduce(parseLine, buffer);
 }
 
 function parseLine(event: ServerSentEvent, line: string) {
   const separator = line.indexOf(":");
-  const field = separator === -1 ? line : line.slice(0,separator);
+  const field = separator === -1 ? line : line.slice(0, separator);
   const value = separator === -1 ? "" : line.slice(separator + 1);
 
   switch (field) {
-    case 'id':
+    case "id":
-      event.id = value.trim()
+      event.id = value.trim();
-      break
+      break;
-    case 'event':
+    case "event":
-      event.type = value.trim()
+      event.type = value.trim();
-      break
+      break;
-    case 'data':
+    case "data":
-      event.data += value.trimStart()
+      event.data += value.trimStart();
-      break
+      break;
     default:
-      break
+      break;
   }
 
-  return event
+  return event;
 }

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

@@ -3,22 +3,25 @@ import { logger } from "../../../../logger";
 import { APIFormat } from "../../../../shared/key-management";
 import { assertNever } from "../../../../shared/utils";
 import {
+  anthropicChatToOpenAI,
+  anthropicChatToAnthropicV2,
   anthropicV1ToOpenAI,
+  AnthropicV2StreamEvent,
   anthropicV2ToOpenAI,
+  googleAIToOpenAI,
   OpenAIChatCompletionStreamEvent,
   openAITextToOpenAIChat,
+  passthroughToOpenAI,
   StreamingCompletionTransformer,
 } from "./index";
-import { passthroughToOpenAI } from "./transformers/passthrough-to-openai";
-
-const genlog = logger.child({ module: "sse-transformer" });
 
 type SSEMessageTransformerOptions = TransformOptions & {
   requestedModel: string;
   requestId: string;
   inputFormat: APIFormat;
   inputApiVersion?: string;
-  logger?: typeof logger;
+  outputFormat?: APIFormat;
+  logger: typeof logger;
 };
 
 /**
@@ -27,21 +30,26 @@ type SSEMessageTransformerOptions = TransformOptions & {
  */
 export class SSEMessageTransformer extends Transform {
   private lastPosition: number;
+  private transformState: any;
   private msgCount: number;
   private readonly inputFormat: APIFormat;
-  private readonly transformFn: StreamingCompletionTransformer;
+  private readonly transformFn: StreamingCompletionTransformer<
+    // TODO: Refactor transformers to not assume only OpenAI events as output
+    OpenAIChatCompletionStreamEvent | AnthropicV2StreamEvent
+  >;
   private readonly log;
   private readonly fallbackId: string;
   private readonly fallbackModel: string;
 
   constructor(options: SSEMessageTransformerOptions) {
     super({ ...options, readableObjectMode: true });
-    this.log = options.logger?.child({ module: "sse-transformer" }) ?? genlog;
+    this.log = options.logger?.child({ module: "sse-transformer" });
     this.lastPosition = 0;
     this.msgCount = 0;
     this.transformFn = getTransformer(
       options.inputFormat,
-      options.inputApiVersion
+      options.inputApiVersion,
+      options.outputFormat
     );
     this.inputFormat = options.inputFormat;
     this.fallbackId = options.requestId;
@@ -59,15 +67,20 @@ export class SSEMessageTransformer extends Transform {
   _transform(chunk: Buffer, _encoding: BufferEncoding, callback: Function) {
     try {
       const originalMessage = chunk.toString();
-      const { event: transformedMessage, position: newPosition } =
+      const {
-        this.transformFn({
+        event: transformedMessage,
+        position: newPosition,
+        state,
+      } = this.transformFn({
         data: originalMessage,
         lastPosition: this.lastPosition,
         index: this.msgCount++,
         fallbackId: this.fallbackId,
         fallbackModel: this.fallbackModel,
+        state: this.transformState,
       });
       this.lastPosition = newPosition;
+      this.transformState = state;
 
       // Special case for Azure OpenAI, which is 99% the same as OpenAI but
       // sometimes emits an extra event at the beginning of the stream with the
@@ -85,33 +98,52 @@ export class SSEMessageTransformer extends Transform {
       // Some events may not be transformed, e.g. ping events
       if (!transformedMessage) return callback();
 
-      if (this.msgCount === 1) {
+      if (this.msgCount === 1 && eventIsOpenAIEvent(transformedMessage)) {
         // TODO: does this need to be skipped for passthroughToOpenAI?
         this.push(createInitialMessage(transformedMessage));
       }
       this.push(transformedMessage);
       callback();
     } catch (err) {
+      err.lastEvent = chunk?.toString();
       this.log.error(err, "Error transforming SSE message");
       callback(err);
     }
   }
 }
 
+function eventIsOpenAIEvent(
+  event: any
+): event is OpenAIChatCompletionStreamEvent {
+  return event?.object === "chat.completion.chunk";
+}
+
 function getTransformer(
   responseApi: APIFormat,
-  version?: string
+  version?: string,
-): StreamingCompletionTransformer {
+  // 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.
+  requestApi: APIFormat = "openai"
+): StreamingCompletionTransformer<
+  OpenAIChatCompletionStreamEvent | AnthropicV2StreamEvent
+> {
   switch (responseApi) {
     case "openai":
+    case "mistral-ai":
       return passthroughToOpenAI;
     case "openai-text":
       return openAITextToOpenAIChat;
-    case "anthropic":
+    case "anthropic-text":
       return version === "2023-01-01"
         ? anthropicV1ToOpenAI
         : anthropicV2ToOpenAI;
-    case "google-palm":
+    case "anthropic-chat":
+      return requestApi === "anthropic-text"
+        ? anthropicChatToAnthropicV2
+        : anthropicChatToOpenAI;
+    case "google-ai":
+      return googleAIToOpenAI;
     case "openai-image":
       throw new Error(`SSE transformation not supported for ${responseApi}`);
     default:

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

@@ -1,114 +1,174 @@
+import pino from "pino";
 import { Transform, TransformOptions } from "stream";
-// @ts-ignore
+import { Message } from "@smithy/eventstream-codec";
-import { Parser } from "lifion-aws-event-stream";
+import { APIFormat } from "../../../../shared/key-management";
-import { logger } from "../../../../logger";
 import { RetryableError } from "../index";
+import { buildSpoofedSSE } from "../error-generator";
+import { BadRequestError } from "../../../../shared/errors";
 
-const log = logger.child({ module: "sse-stream-adapter" });
+type SSEStreamAdapterOptions = TransformOptions & {
-
+  contentType?: string;
-type SSEStreamAdapterOptions = TransformOptions & { contentType?: string };
+  api: APIFormat;
-type AwsEventStreamMessage = {
+  logger: pino.Logger;
-  headers: {
-    ":message-type": "event" | "exception";
-    ":exception-type"?: string;
-  };
-  payload: { message?: string /** base64 encoded */; bytes?: string };
 };
 
 /**
- * Receives either text chunks or AWS binary event stream chunks and emits
+ * Receives a stream of events in a variety of formats and transforms them into
- * full SSE events.
+ * Server-Sent Events.
+ *
+ * This is an object-mode stream, so it expects to receive objects and will emit
+ * strings.
  */
 export class SSEStreamAdapter extends Transform {
   private readonly isAwsStream;
-  private parser = new Parser();
+  private readonly isGoogleStream;
+  private api: APIFormat;
   private partialMessage = "";
+  private textDecoder = new TextDecoder("utf8");
+  private log: pino.Logger;
 
-  constructor(options?: SSEStreamAdapterOptions) {
+  constructor(options: SSEStreamAdapterOptions) {
-    super(options);
+    super({ ...options, objectMode: true });
     this.isAwsStream =
       options?.contentType === "application/vnd.amazon.eventstream";
-
+    this.isGoogleStream = options?.api === "google-ai";
-    this.parser.on("data", (data: AwsEventStreamMessage) => {
+    this.api = options.api;
-      const message = this.processAwsEvent(data);
+    this.log = options.logger.child({ module: "sse-stream-adapter" });
-      if (message) {
-        this.push(Buffer.from(message + "\n\n"), "utf8");
-      }
-    });
   }
 
-  protected processAwsEvent(event: AwsEventStreamMessage): string | null {
+  protected processAwsMessage(message: Message): string | null {
-    const { payload, headers } = event;
+    // Per amazon, headers and body are always present. headers is an object,
-    if (headers[":message-type"] === "exception" || !payload.bytes) {
+    // body is a Uint8Array, potentially zero-length.
-      const eventStr = JSON.stringify(event);
+    const { headers, body } = message;
-      // Under high load, AWS can rugpull us by returning a 200 and starting the
+    const eventType = headers[":event-type"]?.value;
-      // stream but then immediately sending a rate limit error as the first
+    const messageType = headers[":message-type"]?.value;
-      // event. My guess is some race condition in their rate limiting check
+    const contentType = headers[":content-type"]?.value;
-      // that occurs if two requests arrive at the same time when only one
+    const exceptionType = headers[":exception-type"]?.value;
-      // concurrency slot is available.
+    const errorCode = headers[":error-code"]?.value;
-      if (headers[":exception-type"] === "throttlingException") {
+    const bodyStr = this.textDecoder.decode(body);
-        log.warn(
+
-          { event: eventStr },
+    switch (messageType) {
+      case "event":
+        if (contentType === "application/json" && eventType === "chunk") {
+          const { bytes } = JSON.parse(bodyStr);
+          const event = Buffer.from(bytes, "base64").toString("utf8");
+          const eventObj = JSON.parse(event);
+
+          if ("completion" in eventObj) {
+            return ["event: completion", `data: ${event}`].join(`\n`);
+          } else {
+            return [`event: ${eventObj.type}`, `data: ${event}`].join(`\n`);
+          }
+        }
+      // noinspection FallThroughInSwitchStatementJS -- non-JSON data is unexpected
+      case "exception":
+      case "error":
+        const type = String(
+          exceptionType || errorCode || "UnknownError"
+        ).toLowerCase();
+        switch (type) {
+          case "throttlingexception":
+            this.log.warn(
               "AWS request throttled after streaming has already started; retrying"
             );
             throw new RetryableError("AWS request throttled mid-stream");
-      } else {
+          case "validationexception":
-        log.error(
+            try {
-          { event: eventStr },
+              const { message } = JSON.parse(bodyStr);
-          "Received unexpected AWS event stream message"
+              this.log.error({ message }, "Received AWS validation error");
+              this.emit(
+                "error",
+                new BadRequestError(`AWS validation error: ${message}`)
+              );
+              return null;
+            } catch (error) {
+              this.log.error(
+                { body: bodyStr, error },
+                "Could not parse AWS validation error"
               );
-        return getFakeErrorCompletion("proxy AWS error", eventStr);
             }
-    } else {
+          // noinspection FallThroughInSwitchStatementJS -- who knows what this is
-      const { bytes } = payload;
+          default:
-      // technically this is a transformation but we don't really distinguish
+            let text;
-      // between aws claude and anthropic claude at the APIFormat level, so
+            try {
-      // these will short circuit the message transformer
+              text = JSON.parse(bodyStr).message;
-      return [
+            } catch (error) {
-        "event: completion",
+              text = bodyStr;
-        `data: ${Buffer.from(bytes, "base64").toString("utf8")}`,
+            }
-      ].join("\n");
+            const error: any = new Error(
+              `Got mysterious error chunk: [${type}] ${text}`
+            );
+            error.lastEvent = text;
+            this.emit("error", error);
+            return null;
+        }
+      default:
+        // Amazon says this can't ever happen...
+        this.log.error({ message }, "Received very bad AWS stream event");
+        return null;
     }
   }
 
-  _transform(chunk: Buffer, _encoding: BufferEncoding, callback: Function) {
+  /** 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) {
-        this.parser.write(chunk);
+        // `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 {
-        // We may receive multiple (or partial) SSE messages in a single chunk,
+        // `data` is a string, but possibly only a partial message
-        // so we need to buffer and emit separate stream events for full
+        const fullMessages = (this.partialMessage + data).split(
-        // messages so we can parse/transform them properly.
+          /\r\r|\n\n|\r\n\r\n/
-        const str = chunk.toString("utf8");
+        );
-
-        const fullMessages = (this.partialMessage + str).split(/\r?\n\r?\n/);
         this.partialMessage = fullMessages.pop() || "";
 
         for (const message of fullMessages) {
           // Mixing line endings will break some clients and our request queue
           // will have already sent \n for heartbeats, so we need to normalize
           // to \n.
-          this.push(message.replace(/\r\n/g, "\n") + "\n\n");
+          this.push(message.replace(/\r\n?/g, "\n") + "\n\n");
         }
       }
       callback();
     } catch (error) {
-      this.emit("error", error);
+      error.lastEvent = data?.toString() ?? "[SSEStreamAdapter] no data";
       callback(error);
     }
   }
-}
 
-function getFakeErrorCompletion(type: string, message: string) {
+  _flush(callback: (err?: Error | null) => void) {
-  const content = `\`\`\`\n[${type}: ${message}]\n\`\`\`\n`;
+    callback();
-  const fakeEvent = JSON.stringify({
+  }
-    log_id: "aws-proxy-sse-message",
-    stop_reason: type,
-    completion:
-      "\nProxy encountered an error during streaming response.\n" + content,
-    truncated: false,
-    stop: null,
-    model: "",
-  });
-  return ["event: completion", `data: ${fakeEvent}\n\n`].join("\n");
 }

src/proxy/middleware/response/streaming/transformers/anthropic-chat-to-anthropic-v2.ts

@@ -0,0 +1,129 @@
+import {
+  AnthropicV2StreamEvent,
+  StreamingCompletionTransformer,
+} from "../index";
+import { parseEvent, ServerSentEvent } from "../parse-sse";
+import { logger } from "../../../../../logger";
+
+const log = logger.child({
+  module: "sse-transformer",
+  transformer: "anthropic-chat-to-anthropic-v2",
+});
+
+export type AnthropicChatEventType =
+  | "message_start"
+  | "content_block_start"
+  | "content_block_delta"
+  | "content_block_stop"
+  | "message_delta"
+  | "message_stop";
+
+type AnthropicChatStartEvent = {
+  type: "message_start";
+  message: {
+    id: string;
+    type: "message";
+    role: "assistant";
+    content: [];
+    model: string;
+    stop_reason: null;
+    stop_sequence: null;
+    usage: { input_tokens: number; output_tokens: number };
+  };
+};
+
+type AnthropicChatContentBlockStartEvent = {
+  type: "content_block_start";
+  index: number;
+  content_block: { type: "text"; text: string };
+};
+
+export type AnthropicChatContentBlockDeltaEvent = {
+  type: "content_block_delta";
+  index: number;
+  delta: { type: "text_delta"; text: string };
+};
+
+type AnthropicChatContentBlockStopEvent = {
+  type: "content_block_stop";
+  index: number;
+};
+
+type AnthropicChatMessageDeltaEvent = {
+  type: "message_delta";
+  delta: {
+    stop_reason: string;
+    stop_sequence: null;
+    usage: { output_tokens: number };
+  };
+};
+
+type AnthropicChatMessageStopEvent = {
+  type: "message_stop";
+};
+
+type AnthropicChatTransformerState = { content: string };
+
+/**
+ * Transforms an incoming Anthropic Chat SSE to an equivalent Anthropic V2
+ * Text SSE.
+ * For now we assume there is only one content block and message delta. In the
+ * future Anthropic may add multi-turn responses or multiple content blocks
+ * (probably for multimodal responses, image generation, etc) but as far as I
+ * can tell this is not yet implemented.
+ */
+export const anthropicChatToAnthropicV2: StreamingCompletionTransformer<
+  AnthropicV2StreamEvent,
+  AnthropicChatTransformerState
+> = (params) => {
+  const { data } = params;
+
+  const rawEvent = parseEvent(data);
+  if (!rawEvent.data || !rawEvent.type) {
+    return { position: -1 };
+  }
+
+  const deltaEvent = asAnthropicChatDelta(rawEvent);
+  if (!deltaEvent) {
+    return { position: -1 };
+  }
+
+  const newEvent = {
+    log_id: params.fallbackId,
+    model: params.fallbackModel,
+    completion: deltaEvent.delta.text,
+    stop_reason: null,
+  };
+
+  return { position: -1, event: newEvent };
+};
+
+export function asAnthropicChatDelta(
+  event: ServerSentEvent
+): AnthropicChatContentBlockDeltaEvent | null {
+  if (
+    !event.type ||
+    !["content_block_start", "content_block_delta"].includes(event.type)
+  ) {
+    return null;
+  }
+
+  try {
+    const parsed = JSON.parse(event.data);
+    if (parsed.type === "content_block_delta") {
+      return parsed;
+    } else if (parsed.type === "content_block_start") {
+      return {
+        type: "content_block_delta",
+        index: parsed.index,
+        delta: { type: "text_delta", text: parsed.content_block?.text ?? "" },
+      };
+    } else {
+      // noinspection ExceptionCaughtLocallyJS
+      throw new Error("Invalid event type");
+    }
+  } catch (error) {
+    log.warn({ error: error.stack, event }, "Received invalid event");
+  }
+  return null;
+}

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

@@ -0,0 +1,45 @@
+import { StreamingCompletionTransformer } from "../index";
+import { parseEvent } from "../parse-sse";
+import { logger } from "../../../../../logger";
+import { asAnthropicChatDelta } from "./anthropic-chat-to-anthropic-v2";
+
+const log = logger.child({
+  module: "sse-transformer",
+  transformer: "anthropic-chat-to-openai",
+});
+
+/**
+ * Transforms an incoming Anthropic Chat SSE to an equivalent OpenAI
+ * chat.completion.chunks SSE.
+ */
+export const anthropicChatToOpenAI: StreamingCompletionTransformer = (
+  params
+) => {
+  const { data } = params;
+
+  const rawEvent = parseEvent(data);
+  if (!rawEvent.data || !rawEvent.type) {
+    return { position: -1 };
+  }
+
+  const deltaEvent = asAnthropicChatDelta(rawEvent);
+  if (!deltaEvent) {
+    return { position: -1 };
+  }
+
+  const newEvent = {
+    id: params.fallbackId,
+    object: "chat.completion.chunk" as const,
+    created: Date.now(),
+    model: params.fallbackModel,
+    choices: [
+      {
+        index: params.index,
+        delta: { content: deltaEvent.delta.text },
+        finish_reason: null,
+      },
+    ],
+  };
+
+  return { position: -1, event: newEvent };
+};

src/proxy/middleware/response/streaming/transformers/anthropic-v2-to-openai.ts

@@ -1,4 +1,7 @@
-import { StreamingCompletionTransformer } from "../index";
+import {
+  AnthropicV2StreamEvent,
+  StreamingCompletionTransformer,
+} from "../index";
 import { parseEvent, ServerSentEvent } from "../parse-sse";
 import { logger } from "../../../../../logger";
 
@@ -7,13 +10,6 @@ const log = logger.child({
   transformer: "anthropic-v2-to-openai",
 });
 
-type AnthropicV2StreamEvent = {
-  log_id?: string;
-  model?: string;
-  completion: string;
-  stop_reason: string;
-};
-
 /**
  * Transforms an incoming Anthropic SSE (2023-06-01 API) to an equivalent
  * OpenAI chat.completion.chunk SSE.

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

@@ -0,0 +1,76 @@
+import { StreamingCompletionTransformer } from "../index";
+import { parseEvent, ServerSentEvent } from "../parse-sse";
+import { logger } from "../../../../../logger";
+
+const log = logger.child({
+  module: "sse-transformer",
+  transformer: "google-ai-to-openai",
+});
+
+type GoogleAIStreamEvent = {
+  candidates: {
+    content: { parts: { text: string }[]; role: string };
+    finishReason?: "STOP" | "MAX_TOKENS" | "SAFETY" | "RECITATION" | "OTHER";
+    index: number;
+    tokenCount?: number;
+    safetyRatings: { category: string; probability: string }[];
+  }[];
+};
+
+/**
+ * Transforms an incoming Google AI SSE to an equivalent OpenAI
+ * chat.completion.chunk SSE.
+ */
+export const googleAIToOpenAI: StreamingCompletionTransformer = (params) => {
+  const { data, index } = params;
+
+  const rawEvent = parseEvent(data);
+  if (!rawEvent.data || rawEvent.data === "[DONE]") {
+    return { position: -1 };
+  }
+
+  const completionEvent = asCompletion(rawEvent);
+  if (!completionEvent) {
+    return { position: -1 };
+  }
+
+  const parts = completionEvent.candidates[0].content.parts;
+  let content = parts[0]?.text ?? "";
+
+  // If this is the first chunk, try stripping speaker names from the response
+  // e.g. "John: Hello" -> "Hello"
+  if (index === 0) {
+    content = content.replace(/^(.*?): /, "").trim();
+  }
+
+  const newEvent = {
+    id: "goo-" + params.fallbackId,
+    object: "chat.completion.chunk" as const,
+    created: Date.now(),
+    model: params.fallbackModel,
+    choices: [
+      {
+        index: 0,
+        delta: { content },
+        finish_reason: completionEvent.candidates[0].finishReason ?? null,
+      },
+    ],
+  };
+
+  return { position: -1, event: newEvent };
+};
+
+function asCompletion(event: ServerSentEvent): GoogleAIStreamEvent | null {
+  try {
+    const parsed = JSON.parse(event.data) as GoogleAIStreamEvent;
+    if (parsed.candidates?.length > 0) {
+      return parsed;
+    } else {
+      // noinspection ExceptionCaughtLocallyJS
+      throw new Error("Missing required fields");
+    }
+  } catch (error) {
+    log.warn({ error: error.stack, event }, "Received invalid event");
+  }
+  return null;
+}

src/proxy/mistral-ai.ts

@@ -0,0 +1,125 @@
+import { RequestHandler, Router } from "express";
+import { createProxyMiddleware } from "http-proxy-middleware";
+import { config } from "../config";
+import { keyPool } from "../shared/key-management";
+import {
+  getMistralAIModelFamily,
+  MistralAIModelFamily,
+  ModelFamily,
+} from "../shared/models";
+import { logger } from "../logger";
+import { createQueueMiddleware } from "./queue";
+import { ipLimiter } from "./rate-limit";
+import { handleProxyError } from "./middleware/common";
+import {
+  addKey,
+  createOnProxyReqHandler,
+  createPreprocessorMiddleware,
+  finalizeBody,
+} from "./middleware/request";
+import {
+  createOnProxyResHandler,
+  ProxyResHandlerWithBody,
+} from "./middleware/response";
+
+// https://docs.mistral.ai/platform/endpoints
+export const KNOWN_MISTRAL_AI_MODELS = [
+  // Mistral 7b (open weight, legacy)
+  "open-mistral-7b",
+  "mistral-tiny-2312",
+  // Mixtral 8x7b (open weight, legacy)
+  "open-mixtral-8x7b",
+  "mistral-small-2312",
+  // Mixtral Small (newer 8x7b, closed weight)
+  "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",
+];
+
+let modelsCache: any = null;
+let modelsCacheTime = 0;
+
+export function generateModelList(models = KNOWN_MISTRAL_AI_MODELS) {
+  let available = new Set<MistralAIModelFamily>();
+  for (const key of keyPool.list()) {
+    if (key.isDisabled || key.service !== "mistral-ai") continue;
+    key.modelFamilies.forEach((family) =>
+      available.add(family as MistralAIModelFamily)
+    );
+  }
+  const allowed = new Set<ModelFamily>(config.allowedModelFamilies);
+  available = new Set([...available].filter((x) => allowed.has(x)));
+
+  return models
+    .map((id) => ({
+      id,
+      object: "model",
+      created: new Date().getTime(),
+      owned_by: "mistral-ai",
+    }))
+    .filter((model) => available.has(getMistralAIModelFamily(model.id)));
+}
+
+const handleModelRequest: RequestHandler = (_req, res) => {
+  if (new Date().getTime() - modelsCacheTime < 1000 * 60){
+    return res.status(200).json(modelsCache);
+  }
+  const result = generateModelList();
+  modelsCache = { object: "list", data: result };
+  modelsCacheTime = new Date().getTime();
+  res.status(200).json(modelsCache);
+};
+
+const mistralAIResponseHandler: ProxyResHandlerWithBody = async (
+  _proxyRes,
+  req,
+  res,
+  body
+) => {
+  if (typeof body !== "object") {
+    throw new Error("Expected body to be an object");
+  }
+
+  res.status(200).json({ ...body, 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,
+    },
+  }),
+});
+
+const mistralAIRouter = Router();
+mistralAIRouter.get("/v1/models", handleModelRequest);
+// General chat completion endpoint.
+mistralAIRouter.post(
+  "/v1/chat/completions",
+  ipLimiter,
+  createPreprocessorMiddleware({
+    inApi: "mistral-ai",
+    outApi: "mistral-ai",
+    service: "mistral-ai",
+  }),
+  mistralAIProxy
+);
+
+export const mistralAI = mistralAIRouter;

src/proxy/openai-image.ts

@@ -16,17 +16,16 @@ import {
   ProxyResHandlerWithBody,
 } from "./middleware/response";
 import { generateModelList } from "./openai";
-import {
+import { OpenAIImageGenerationResult } from "../shared/file-storage/mirror-generated-image";
-  mirrorGeneratedImage,
-  OpenAIImageGenerationResult,
-} from "../shared/file-storage/mirror-generated-image";
 
 const KNOWN_MODELS = ["dall-e-2", "dall-e-3"];
 
 let modelListCache: any = null;
 let modelListValid = 0;
 const handleModelRequest: RequestHandler = (_req, res) => {
-  if (new Date().getTime() - modelListValid < 1000 * 60) return modelListCache;
+  if (new Date().getTime() - modelListValid < 1000 * 60) {
+    return res.status(200).json(modelListCache);
+  }
   const result = generateModelList(KNOWN_MODELS);
   modelListCache = { object: "list", data: result };
   modelListValid = new Date().getTime();
@@ -43,21 +42,16 @@ const openaiImagesResponseHandler: ProxyResHandlerWithBody = async (
     throw new Error("Expected body to be an object");
   }
 
-  if (config.promptLogging) {
+  let newBody = body;
-    const host = req.get("host");
-    body.proxy_note = `Prompts are logged on this proxy instance. See ${host} for more information.`;
-  }
-
   if (req.inboundApi === "openai") {
     req.log.info("Transforming OpenAI image response to OpenAI chat format");
-    body = transformResponseForChat(body as OpenAIImageGenerationResult, req);
+    newBody = transformResponseForChat(
+      body as OpenAIImageGenerationResult,
+      req
+    );
   }
 
-  if (req.tokenizerInfo) {
+  res.status(200).json({ ...newBody, proxy: body.proxy });
-    body.proxy_tokenizer = req.tokenizerInfo;
-  }
-
-  res.status(200).json(body);
 };
 
 /**

src/proxy/openai.ts

@@ -1,7 +1,7 @@
 import { RequestHandler, Router } from "express";
 import { createProxyMiddleware } from "http-proxy-middleware";
 import { config } from "../config";
-import { keyPool } from "../shared/key-management";
+import { keyPool, OpenAIKey } from "../shared/key-management";
 import {
   getOpenAIModelFamily,
   ModelFamily,
@@ -28,14 +28,16 @@ import {
 
 // 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-0613",
   "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",
@@ -50,15 +52,21 @@ let modelsCache: any = null;
 let modelsCacheTime = 0;
 
 export function generateModelList(models = KNOWN_OPENAI_MODELS) {
-  let available = new Set<OpenAIModelFamily>();
+  // 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;
-    key.modelFamilies.forEach((family) =>
+    const asOpenAIKey = key as OpenAIKey;
-      available.add(family as OpenAIModelFamily)
+    asOpenAIKey.modelFamilies.forEach((f) => availableFamilies.add(f));
-    );
+    asOpenAIKey.modelSnapshots.forEach((s) => availableSnapshots.add(s));
   }
+
+  // Remove disabled families
   const allowed = new Set<ModelFamily>(config.allowedModelFamilies);
-  available = new Set([...available].filter((x) => allowed.has(x)));
+  availableFamilies = new Set(
+    [...availableFamilies].filter((x) => allowed.has(x))
+  );
 
   return models
     .map((id) => ({
@@ -79,11 +87,22 @@ export function generateModelList(models = KNOWN_OPENAI_MODELS) {
       root: id,
       parent: null,
     }))
-    .filter((model) => available.has(getOpenAIModelFamily(model.id)));
+    .filter((model) => {
+      // First check if the family is available
+      const hasFamily = availableFamilies.has(getOpenAIModelFamily(model.id));
+      if (!hasFamily) return false;
+
+      // 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);
+    });
 }
 
 const handleModelRequest: RequestHandler = (_req, res) => {
-  if (new Date().getTime() - modelsCacheTime < 1000 * 60) return modelsCache;
+  if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
+    return res.status(200).json(modelsCache);
+  }
   const result = generateModelList();
   modelsCache = { object: "list", data: result };
   modelsCacheTime = new Date().getTime();
@@ -119,21 +138,13 @@ const openaiResponseHandler: ProxyResHandlerWithBody = async (
     throw new Error("Expected body to be an object");
   }
 
-  if (config.promptLogging) {
+  let newBody = body;
-    const host = req.get("host");
-    body.proxy_note = `Prompts are logged on this proxy instance. See ${host} for more information.`;
-  }
-
   if (req.outboundApi === "openai-text" && req.inboundApi === "openai") {
     req.log.info("Transforming Turbo-Instruct response to Chat format");
-    body = transformTurboInstructResponse(body);
+    newBody = transformTurboInstructResponse(body);
   }
 
-  if (req.tokenizerInfo) {
+  res.status(200).json({ ...newBody, proxy: body.proxy });
-    body.proxy_tokenizer = req.tokenizerInfo;
-  }
-
-  res.status(200).json(body);
 };
 
 /** Only used for non-streaming responses. */
@@ -161,9 +172,7 @@ const openaiProxy = createQueueMiddleware({
     selfHandleResponse: true,
     logger,
     on: {
-      proxyReq: createOnProxyReqHandler({
+      proxyReq: createOnProxyReqHandler({ pipeline: [addKey, finalizeBody] }),
-        pipeline: [addKey, finalizeBody],
-      }),
       proxyRes: createOnProxyResHandler([openaiResponseHandler]),
       error: handleProxyError,
     },

src/proxy/palm.ts

@@ -1,170 +0,0 @@
-import { Request, RequestHandler, Router } from "express";
-import * as http from "http";
-import { createProxyMiddleware } from "http-proxy-middleware";
-import { v4 } from "uuid";
-import { config } from "../config";
-import { logger } from "../logger";
-import { createQueueMiddleware } from "./queue";
-import { ipLimiter } from "./rate-limit";
-import { handleProxyError } from "./middleware/common";
-import {
-  addKey,
-  createOnProxyReqHandler,
-  createPreprocessorMiddleware,
-  finalizeBody,
-  forceModel,
-} from "./middleware/request";
-import {
-  createOnProxyResHandler,
-  ProxyResHandlerWithBody,
-} from "./middleware/response";
-
-let modelsCache: any = null;
-let modelsCacheTime = 0;
-
-const getModelsResponse = () => {
-  if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
-    return modelsCache;
-  }
-
-  if (!config.googlePalmKey) return { object: "list", data: [] };
-
-  const bisonVariants = ["text-bison-001"];
-
-  const models = bisonVariants.map((id) => ({
-    id,
-    object: "model",
-    created: new Date().getTime(),
-    owned_by: "google",
-    permission: [],
-    root: "palm",
-    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 palmResponseHandler: ProxyResHandlerWithBody = async (
-  _proxyRes,
-  req,
-  res,
-  body
-) => {
-  if (typeof body !== "object") {
-    throw new Error("Expected body to be an object");
-  }
-
-  if (config.promptLogging) {
-    const host = req.get("host");
-    body.proxy_note = `Prompts are logged on this proxy instance. See ${host} for more information.`;
-  }
-
-  if (req.inboundApi === "openai") {
-    req.log.info("Transforming Google PaLM response to OpenAI format");
-    body = transformPalmResponse(body, req);
-  }
-
-  if (req.tokenizerInfo) {
-    body.proxy_tokenizer = req.tokenizerInfo;
-  }
-
-  // TODO: PaLM has no streaming capability which will pose a problem here if
-  // requests wait in the queue for too long.  Probably need to fake streaming
-  // and return the entire completion in one stream event using the other
-  // response handler.
-  res.status(200).json(body);
-};
-
-/**
- * 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 transformPalmResponse(
-  palmRespBody: Record<string, any>,
-  req: Request
-): Record<string, any> {
-  const totalTokens = (req.promptTokens ?? 0) + (req.outputTokens ?? 0);
-  return {
-    id: "plm-" + 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: palmRespBody.candidates[0].output,
-        },
-        finish_reason: null, // palm doesn't return this
-        index: 0,
-      },
-    ],
-  };
-}
-
-function reassignPathForPalmModel(proxyReq: http.ClientRequest, req: Request) {
-  if (req.body.stream) {
-    throw new Error("Google PaLM API doesn't support streaming requests");
-  }
-
-  // PaLM API specifies the model in the URL path, not the request body. This
-  // doesn't work well with our rewriter architecture, so we need to manually
-  // fix it here.
-
-  // POST https://generativelanguage.googleapis.com/v1beta2/{model=models/*}:generateText
-  // POST https://generativelanguage.googleapis.com/v1beta2/{model=models/*}:generateMessage
-
-  // The chat api (generateMessage) is not very useful at this time as it has
-  // few params and no adjustable safety settings.
-
-  proxyReq.path = proxyReq.path.replace(
-    /^\/v1\/chat\/completions/,
-    `/v1beta2/models/${req.body.model}:generateText`
-  );
-}
-
-const googlePalmProxy = createQueueMiddleware({
-  proxyMiddleware: createProxyMiddleware({
-    target: "https://generativelanguage.googleapis.com",
-    changeOrigin: true,
-    selfHandleResponse: true,
-    logger,
-    on: {
-      proxyReq: createOnProxyReqHandler({
-        pipeline: [reassignPathForPalmModel, addKey, finalizeBody],
-      }),
-      proxyRes: createOnProxyResHandler([palmResponseHandler]),
-      error: handleProxyError,
-    },
-  }),
-});
-
-const palmRouter = Router();
-palmRouter.get("/v1/models", handleModelRequest);
-// OpenAI-to-Google PaLM compatibility endpoint.
-palmRouter.post(
-  "/v1/chat/completions",
-  ipLimiter,
-  createPreprocessorMiddleware(
-    { inApi: "openai", outApi: "google-palm", service: "google-palm" },
-    { afterTransform: [forceModel("text-bison-001")] }
-  ),
-  googlePalmProxy
-);
-
-export const googlePalm = palmRouter;

src/proxy/queue.ts

@@ -13,13 +13,19 @@
 
 import crypto from "crypto";
 import type { Handler, Request } from "express";
+import { BadRequestError, TooManyRequestsError } from "../shared/errors";
 import { keyPool } from "../shared/key-management";
-import { getModelFamilyForRequest, MODEL_FAMILIES, ModelFamily } from "../shared/models";
+import {
-import { buildFakeSse, initializeSseStream } from "../shared/streaming";
+  getModelFamilyForRequest,
+  MODEL_FAMILIES,
+  ModelFamily,
+} 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 { sendErrorToClient } from "./middleware/response/error-generator";
 
 const queue: Request[] = [];
 const log = logger.child({ module: "request-queue" });
@@ -37,6 +43,7 @@ const LOAD_THRESHOLD = parseFloat(process.env.LOAD_THRESHOLD ?? "50");
 const PAYLOAD_SCALE_FACTOR = parseFloat(
   process.env.PAYLOAD_SCALE_FACTOR ?? "6"
 );
+const QUEUE_JOIN_TIMEOUT = 5000;
 
 /**
  * Returns an identifier for a request. This is used to determine if a
@@ -60,7 +67,7 @@ const sharesIdentifierWith = (incoming: Request) => (queued: Request) =>
 
 const isFromSharedIp = (req: Request) => SHARED_IP_ADDRESSES.has(req.ip);
 
-export function enqueue(req: Request) {
+export async function enqueue(req: Request) {
   const enqueuedRequestCount = queue.filter(sharesIdentifierWith(req)).length;
   let isGuest = req.user?.token === undefined;
 
@@ -75,10 +82,14 @@ export function enqueue(req: Request) {
       // Re-enqueued requests are not counted towards the limit since they
       // already made it through the queue once.
       if (req.retryCount === 0) {
-        throw new Error("Too many agnai.chat requests are already queued");
+        throw new TooManyRequestsError(
+          "Too many agnai.chat requests are already queued"
+        );
       }
     } else {
-      throw new Error("Your IP or token already has a request in the queue");
+      throw new TooManyRequestsError(
+        "Your IP or user token already has another request in the queue."
+      );
     }
   }
 
@@ -92,12 +103,12 @@ export function enqueue(req: Request) {
   if (stream === "true" || stream === true || req.isStreaming) {
     const res = req.res!;
     if (!res.headersSent) {
-      initStreaming(req);
+      await initStreaming(req);
     }
     registerHeartbeat(req);
   } else if (getProxyLoad() > LOAD_THRESHOLD) {
-    throw new Error(
+    throw new BadRequestError(
-      "Due to heavy traffic on this proxy, you must enable streaming for your request."
+      "Due to heavy traffic on this proxy, you must enable streaming in your chat client to use this endpoint."
     );
   }
 
@@ -119,7 +130,9 @@ export function enqueue(req: Request) {
   if (req.retryCount ?? 0 > 0) {
     req.log.info({ retries: req.retryCount }, `Enqueued request for retry.`);
   } else {
-    req.log.info(`Enqueued new request.`);
+    const size = req.socket.bytesRead;
+    const endpoint = req.url?.split("?")[0];
+    req.log.info({ size, endpoint }, `Enqueued new request.`);
   }
 }
 
@@ -189,10 +202,10 @@ function processQueue() {
   reqs.filter(Boolean).forEach((req) => {
     if (req?.proceed) {
       const modelFamily = getModelFamilyForRequest(req!);
-      req.log.info({
+      req.log.info(
-        retries: req.retryCount,
+        { retries: req.retryCount, partition: modelFamily },
-        partition: modelFamily,
+        `Dequeuing request.`
-      }, `Dequeuing request.`);
+      );
       req.proceed();
     }
   });
@@ -327,7 +340,7 @@ export function createQueueMiddleware({
   beforeProxy?: RequestPreprocessor;
   proxyMiddleware: Handler;
 }): Handler {
-  return (req, res, next) => {
+  return async (req, res, next) => {
     req.proceed = async () => {
       if (beforeProxy) {
         try {
@@ -345,13 +358,22 @@ export function createQueueMiddleware({
     };
 
     try {
-      enqueue(req);
+      await enqueue(req);
     } catch (err: any) {
-      req.res!.status(429).json({
+      const title =
-        type: "proxy_error",
+        err.status === 429
+          ? "Proxy queue error (too many concurrent requests)"
+          : "Proxy queue error (streaming required)";
+      sendErrorToClient({
+        options: {
+          title,
           message: err.message,
-        stack: err.stack,
+          format: req.inboundApi,
-        proxy_note: `Only one request can be queued at a time. If you don't have another request queued, your IP or user token might be in use by another request.`,
+          reqId: req.id,
+          model: req.body?.model,
+        },
+        req,
+        res,
       });
     }
   };
@@ -366,32 +388,55 @@ function killQueuedRequest(req: Request) {
   const res = req.res;
   try {
     const message = `Your request has been terminated by the proxy because it has been in the queue for more than 5 minutes.`;
-    if (res.headersSent) {
+    sendErrorToClient({
-      const fakeErrorEvent = buildFakeSse("proxy queue error", message, req);
+      options: {
-      res.write(fakeErrorEvent);
+        title: "Proxy queue error (request killed)",
-      res.end();
+        message,
-    } else {
+        format: req.inboundApi,
-      res.status(500).json({ error: message });
+        reqId: req.id,
-    }
+        model: req.body?.model,
+      },
+      req,
+      res,
+    });
   } catch (e) {
     req.log.error(e, `Error killing stalled request.`);
   }
 }
 
-function initStreaming(req: Request) {
+async function initStreaming(req: Request) {
   const res = req.res!;
   initializeSseStream(res);
 
-  if (req.query.badSseParser) {
+  const joinMsg = `: joining queue at position ${
-    // Some clients have a broken SSE parser that doesn't handle comments
+    queue.length
-    // correctly. These clients can pass ?badSseParser=true to
+  }\n\n${getHeartbeatPayload()}`;
-    // disable comments in the SSE stream.
-    res.write(getHeartbeatPayload());
-    return;
-  }
 
-  res.write(`: joining queue at position ${queue.length}\n\n`);
+  let drainTimeout: NodeJS.Timeout;
-  res.write(getHeartbeatPayload());
+  const welcome = new Promise<void>((resolve, reject) => {
+    const onDrain = () => {
+      clearTimeout(drainTimeout);
+      req.log.debug(`Client finished consuming join message.`);
+      res.off("drain", onDrain);
+      resolve();
+    };
+
+    drainTimeout = setTimeout(() => {
+      res.off("drain", onDrain);
+      res.destroy();
+      reject(new Error("Unreponsive streaming client; killing connection"));
+    }, QUEUE_JOIN_TIMEOUT);
+
+    if (!res.write(joinMsg)) {
+      req.log.warn("Kernel buffer is full; holding client request.");
+      res.once("drain", onDrain);
+    } else {
+      clearTimeout(drainTimeout);
+      resolve();
+    }
+  });
+
+  await welcome;
 }
 
 /**
@@ -451,14 +496,6 @@ function removeProxyMiddlewareEventListeners(req: Request) {
 export function registerHeartbeat(req: Request) {
   const res = req.res!;
 
-  const currentSize = getHeartbeatSize();
-  req.log.debug({
-    currentSize,
-    HEARTBEAT_INTERVAL,
-    PAYLOAD_SCALE_FACTOR,
-    MAX_HEARTBEAT_SIZE,
-  }, "Joining queue with heartbeat.");
-
   let isBufferFull = false;
   let bufferFullCount = 0;
   req.heartbeatInterval = setInterval(() => {
@@ -502,7 +539,7 @@ function monitorHeartbeat(req: Request) {
     if (bytesSinceLast < minBytes) {
       req.log.warn(
         { minBytes, bytesSinceLast },
-        "Queued request is processing heartbeats enough data or server is overloaded; killing connection."
+        "Queued request is not processing heartbeats enough data or server is overloaded; killing connection."
       );
       res.destroy();
     }

src/proxy/routes.ts

@@ -4,9 +4,11 @@ import { checkRisuToken } from "./check-risu-token";
 import { openai } from "./openai";
 import { openaiImage } from "./openai-image";
 import { anthropic } from "./anthropic";
-import { googlePalm } from "./palm";
+import { googleAI } from "./google-ai";
+import { mistralAI } from "./mistral-ai";
 import { aws } from "./aws";
 import { azure } from "./azure";
+import { sendErrorToClient } from "./middleware/response/error-generator";
 
 const proxyRouter = express.Router();
 proxyRouter.use((req, _res, next) => {
@@ -18,8 +20,8 @@ proxyRouter.use((req, _res, next) => {
   next();
 });
 proxyRouter.use(
-  express.json({ limit: "10mb" }),
+  express.json({ limit: "100mb" }),
-  express.urlencoded({ extended: true, limit: "10mb" })
+  express.urlencoded({ extended: true, limit: "100mb" })
 );
 proxyRouter.use(gatekeeper);
 proxyRouter.use(checkRisuToken);
@@ -31,7 +33,8 @@ proxyRouter.use((req, _res, next) => {
 proxyRouter.use("/openai", addV1, openai);
 proxyRouter.use("/openai-image", addV1, openaiImage);
 proxyRouter.use("/anthropic", addV1, anthropic);
-proxyRouter.use("/google-palm", addV1, googlePalm);
+proxyRouter.use("/google-ai", addV1, googleAI);
+proxyRouter.use("/mistral-ai", addV1, mistralAI);
 proxyRouter.use("/aws/claude", addV1, aws);
 proxyRouter.use("/azure/openai", addV1, azure);
 // Redirect browser requests to the homepage.
@@ -43,6 +46,26 @@ proxyRouter.get("*", (req, res, next) => {
     next();
   }
 });
+// Handle 404s.
+proxyRouter.use((req, res) => {
+  sendErrorToClient({
+    req,
+    res,
+    options: {
+      title: "Proxy error (HTTP 404 Not Found)",
+      message: "The requested proxy endpoint does not exist.",
+      model: req.body?.model,
+      reqId: req.id,
+      format: "unknown",
+      obj: {
+        proxy_note:
+          "Your chat client is using the wrong endpoint. Check the Service Info page for the list of available endpoints.",
+        requested_url: req.originalUrl,
+      },
+    },
+  });
+});
+
 export { proxyRouter as proxyRouter };
 
 function addV1(req: Request, res: Response, next: NextFunction) {

src/server.ts

@@ -12,15 +12,18 @@ import { setupAssetsDir } from "./shared/file-storage/setup-assets-dir";
 import { keyPool } from "./shared/key-management";
 import { adminRouter } from "./admin/routes";
 import { proxyRouter } from "./proxy/routes";
-import { handleInfoPage } from "./info-page";
+import { infoPageRouter } from "./info-page";
+import { IMAGE_GEN_MODELS } from "./shared/models";
+import { userRouter } from "./user/routes";
 import { logQueue } from "./shared/prompt-logging";
 import { start as startRequestQueue } from "./proxy/queue";
 import { init as initUserStore } from "./shared/users/user-store";
 import { init as initTokenizers } from "./shared/tokenization";
 import { checkOrigin } from "./proxy/check-origin";
-import { userRouter } from "./user/routes";
+import { sendErrorToClient } from "./proxy/middleware/response/error-generator";
 
 const PORT = config.port;
+const BIND_ADDRESS = config.bindAddress;
 
 const app = express();
 // middleware
@@ -49,10 +52,7 @@ app.use(
   })
 );
 
-// TODO: Detect (or support manual configuration of) whether the app is behind
+app.set("trust proxy", Number(config.trustedProxies));
-// a load balancer/reverse proxy, which is necessary to determine request IP
-// addresses correctly.
-app.set("trust proxy", true);
 
 app.set("view engine", "ejs");
 app.set("views", [
@@ -61,34 +61,42 @@ app.set("views", [
   path.join(__dirname, "shared/views"),
 ]);
 
-app.use("/user_content", express.static(USER_ASSETS_DIR));
+app.use("/user_content", express.static(USER_ASSETS_DIR, { maxAge: "2h" }));
 
 app.get("/health", (_req, res) => res.sendStatus(200));
 app.use(cors());
 app.use(checkOrigin);
 
-// routes
-app.get("/", handleInfoPage);
 app.use("/admin", adminRouter);
-app.use("/proxy", proxyRouter);
+app.use(config.proxyEndpointRoute, proxyRouter);
 app.use("/user", userRouter);
+if (config.staticServiceInfo) {
+  app.get("/", (_req, res) => res.sendStatus(200));
+} else {
+  app.use("/", infoPageRouter);
+}
 
-// 500 and 404
+app.use(
-app.use((err: any, _req: unknown, res: express.Response, _next: unknown) => {
+  (err: any, req: express.Request, res: express.Response, _next: unknown) => {
-  if (err.status) {
+    if (!err.status) {
-    res.status(err.status).json({ error: err.message });
+      logger.error(err, "Unhandled error in request");
-  } else {
+    }
-    logger.error(err);
+
-    res.status(500).json({
+    sendErrorToClient({
-      error: {
+      req,
-        type: "proxy_error",
+      res,
-        message: err.message,
+      options: {
-        stack: err.stack,
+        title: `Proxy error (HTTP ${err.status})`,
-        proxy_note: `Reverse proxy encountered an internal server error.`,
+        message:
+          "Reverse proxy encountered an unexpected error while processing your request.",
+        reqId: req.id,
+        statusCode: err.status,
+        obj: { error: err.message, stack: err.stack },
+        format: "unknown",
       },
     });
   }
-});
+);
 app.use((_req: unknown, res: express.Response) => {
   res.status(404).json({ error: "Not found" });
 });
@@ -104,7 +112,7 @@ async function start() {
 
   await initTokenizers();
 
-  if (config.allowedModelFamilies.includes("dall-e")) {
+  if (config.allowedModelFamilies.some((f) => IMAGE_GEN_MODELS.includes(f))) {
     await setupAssetsDir();
   }
 
@@ -120,15 +128,18 @@ async function start() {
   logger.info("Starting request queue...");
   startRequestQueue();
 
-  app.listen(PORT, async () => {
-    logger.info({ port: PORT }, "Now listening for connections.");
-    registerUncaughtExceptionHandler();
-  });
-
   const diskSpace = await checkDiskSpace(
     __dirname.startsWith("/app") ? "/app" : os.homedir()
   );
 
+  app.listen(PORT, BIND_ADDRESS, () => {
+    logger.info(
+      { port: PORT, interface: BIND_ADDRESS },
+      "Now listening for connections."
+    );
+    registerUncaughtExceptionHandler();
+  });
+
   logger.info(
     { build: process.env.BUILD_INFO, nodeEnv: process.env.NODE_ENV, diskSpace },
     "Startup complete."
@@ -158,7 +169,18 @@ function registerUncaughtExceptionHandler() {
  * didn't set it to something misleading.
  */
 async function setBuildInfo() {
-  // Render .dockerignore's the .git directory but provides info in the env
+  // For CI builds, use the env vars set during the build process
+  if (process.env.GITGUD_BRANCH) {
+    const sha = process.env.GITGUD_COMMIT?.slice(0, 7) || "unknown SHA";
+    const branch = process.env.GITGUD_BRANCH;
+    const repo = process.env.GITGUD_PROJECT;
+    const buildInfo = `[ci] ${sha} (${branch}@${repo})`;
+    process.env.BUILD_INFO = buildInfo;
+    logger.info({ build: buildInfo }, "Using build info from CI image.");
+    return;
+  }
+
+  // For render, the git directory is dockerignore'd so we use env vars
   if (process.env.RENDER) {
     const sha = process.env.RENDER_GIT_COMMIT?.slice(0, 7) || "unknown SHA";
     const branch = process.env.RENDER_GIT_BRANCH || "unknown branch";
@@ -169,10 +191,10 @@ async function setBuildInfo() {
     return;
   }
 
+  // For huggingface and bare metal deployments, we can get the info from git
   try {
-    // Ignore git's complaints about dubious directory ownership on Huggingface
-    // (which evidently runs dockerized Spaces on Windows with weird NTFS perms)
     if (process.env.SPACE_ID) {
+      // TODO: may not be necessary anymore with adjusted Huggingface dockerfile
       childProcess.execSync("git config --global --add safe.directory /app");
     }
 
@@ -192,7 +214,7 @@ async function setBuildInfo() {
 
     let [sha, branch, remote, status] = await Promise.all(promises);
 
-    remote = remote.match(/.*[\/:]([\w-]+)\/([\w\-\.]+?)(?:\.git)?$/) || [];
+    remote = remote.match(/.*[\/:]([\w-]+)\/([\w\-.]+?)(?:\.git)?$/) || [];
     const repo = remote.slice(-2).join("/");
     status = status
       // ignore Dockerfile changes since that's how the user deploys the app

src/service-info.ts

@@ -0,0 +1,476 @@
+import { config, listConfig } from "./config";
+import {
+  AnthropicKey,
+  AwsBedrockKey,
+  AzureOpenAIKey,
+  GoogleAIKey,
+  keyPool,
+  OpenAIKey,
+} from "./shared/key-management";
+import {
+  AnthropicModelFamily,
+  assertIsKnownModelFamily,
+  AwsBedrockModelFamily,
+  AzureOpenAIModelFamily,
+  GoogleAIModelFamily,
+  LLM_SERVICES,
+  LLMService,
+  MistralAIModelFamily,
+  MODEL_FAMILY_SERVICE,
+  ModelFamily,
+  OpenAIModelFamily,
+} from "./shared/models";
+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";
+
+/** Stats aggregated across all keys for a given service. */
+type ServiceAggregate = "keys" | "uncheckedKeys" | "orgs";
+/** Stats aggregated across all keys for a given model family. */
+type ModelAggregates = {
+  active: number;
+  trial?: number;
+  revoked?: number;
+  overQuota?: number;
+  pozzed?: number;
+  awsLogged?: number;
+  awsSonnet?: number;
+  awsHaiku?: number;
+  queued: number;
+  queueTime: string;
+  tokens: number;
+};
+/** All possible combinations of model family and aggregate type. */
+type ModelAggregateKey = `${ModelFamily}__${keyof ModelAggregates}`;
+
+type AllStats = {
+  proompts: number;
+  tokens: number;
+  tokenCost: number;
+} & { [modelFamily in ModelFamily]?: ModelAggregates } & {
+  [service in LLMService as `${service}__${ServiceAggregate}`]?: number;
+};
+
+type BaseFamilyInfo = {
+  usage?: string;
+  activeKeys: number;
+  revokedKeys?: number;
+  proomptersInQueue?: number;
+  estimatedQueueTime?: string;
+};
+type OpenAIInfo = BaseFamilyInfo & {
+  trialKeys?: number;
+  overQuotaKeys?: number;
+};
+type AnthropicInfo = BaseFamilyInfo & {
+  prefilledKeys?: number;
+  overQuotaKeys?: number;
+};
+type AwsInfo = BaseFamilyInfo & {
+  privacy?: string;
+  sonnetKeys?: number;
+  haikuKeys?: number;
+};
+
+// prettier-ignore
+export type ServiceInfo = {
+  uptime: number;
+  endpoints: {
+    openai?: string;
+    openai2?: string;
+    anthropic?: string;
+    "anthropic-claude-3"?: string;
+    "google-ai"?: string;
+    "mistral-ai"?: string;
+    aws?: string;
+    azure?: string;
+    "openai-image"?: string;
+    "azure-image"?: string;
+  };
+  proompts?: number;
+  tookens?: string;
+  proomptersNow?: number;
+  status?: string;
+  config: ReturnType<typeof listConfig>;
+  build: string;
+} & { [f in OpenAIModelFamily]?: OpenAIInfo }
+  & { [f in AnthropicModelFamily]?: AnthropicInfo; }
+  & { [f in AwsBedrockModelFamily]?: AwsInfo }
+  & { [f in AzureOpenAIModelFamily]?: BaseFamilyInfo; }
+  & { [f in GoogleAIModelFamily]?: BaseFamilyInfo }
+  & { [f in MistralAIModelFamily]?: BaseFamilyInfo };
+
+// https://stackoverflow.com/a/66661477
+// type DeepKeyOf<T> = (
+//   [T] extends [never]
+//     ? ""
+//     : T extends object
+//     ? {
+//         [K in Exclude<keyof T, symbol>]: `${K}${DotPrefix<DeepKeyOf<T[K]>>}`;
+//       }[Exclude<keyof T, symbol>]
+//     : ""
+// ) extends infer D
+//   ? Extract<D, string>
+//   : never;
+// type DotPrefix<T extends string> = T extends "" ? "" : `.${T}`;
+// type ServiceInfoPath = `{${DeepKeyOf<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`,
+  },
+  "mistral-ai": {
+    "mistral-ai": `%BASE%/mistral-ai`,
+  },
+  aws: {
+    aws: `%BASE%/aws/claude`,
+    "aws-sonnet (⚠️Temporary: for AWS Claude 3 Sonnet)": `%BASE%/aws/claude/sonnet`,
+  },
+  azure: {
+    azure: `%BASE%/azure/openai`,
+    "azure-image": `%BASE%/azure/openai`,
+  },
+};
+
+const modelStats = new Map<ModelAggregateKey, number>();
+const serviceStats = new Map<keyof AllStats, number>();
+
+let cachedInfo: ServiceInfo | undefined;
+let cacheTime = 0;
+
+export function buildInfo(baseUrl: string, forAdmin = false): ServiceInfo {
+  if (cacheTime + CACHE_TTL > Date.now()) return cachedInfo!;
+
+  const keys = keyPool.list();
+  const accessibleFamilies = new Set(
+    keys
+      .flatMap((k) => k.modelFamilies)
+      .filter((f) => config.allowedModelFamilies.includes(f))
+      .concat("turbo")
+  );
+
+  modelStats.clear();
+  serviceStats.clear();
+  keys.forEach(addKeyToAggregates);
+
+  const endpoints = getEndpoints(baseUrl, accessibleFamilies);
+  const trafficStats = getTrafficStats();
+  const { serviceInfo, modelFamilyInfo } =
+    getServiceModelStats(accessibleFamilies);
+  const status = getStatus();
+
+  if (config.staticServiceInfo && !forAdmin) {
+    delete trafficStats.proompts;
+    delete trafficStats.tookens;
+    delete trafficStats.proomptersNow;
+    for (const family of Object.keys(modelFamilyInfo)) {
+      assertIsKnownModelFamily(family);
+      delete modelFamilyInfo[family]?.proomptersInQueue;
+      delete modelFamilyInfo[family]?.estimatedQueueTime;
+      delete modelFamilyInfo[family]?.usage;
+    }
+  }
+
+  return (cachedInfo = {
+    uptime: Math.floor(process.uptime()),
+    endpoints,
+    ...trafficStats,
+    ...serviceInfo,
+    status,
+    ...modelFamilyInfo,
+    config: listConfig(),
+    build: process.env.BUILD_INFO || "dev",
+  });
+}
+
+function getStatus() {
+  if (!config.checkKeys) return "Key checking is disabled.";
+
+  let unchecked = 0;
+  for (const service of LLM_SERVICES) {
+    unchecked += serviceStats.get(`${service}__uncheckedKeys`) || 0;
+  }
+
+  return unchecked ? `Checking ${unchecked} keys...` : undefined;
+}
+
+function getEndpoints(baseUrl: string, accessibleFamilies: Set<ModelFamily>) {
+  const endpoints: Record<string, string> = {};
+  const keys = keyPool.list();
+  for (const service of LLM_SERVICES) {
+    if (!keys.some((k) => k.service === service)) {
+      continue;
+    }
+
+    for (const [name, url] of Object.entries(SERVICE_ENDPOINTS[service])) {
+      endpoints[name] = url.replace("%BASE%", baseUrl);
+    }
+
+    if (service === "openai" && !accessibleFamilies.has("dall-e")) {
+      delete endpoints["openai-image"];
+    }
+
+    if (service === "azure" && !accessibleFamilies.has("azure-dall-e")) {
+      delete endpoints["azure-image"];
+    }
+  }
+  return endpoints;
+}
+
+type TrafficStats = Pick<ServiceInfo, "proompts" | "tookens" | "proomptersNow">;
+
+function getTrafficStats(): TrafficStats {
+  const tokens = serviceStats.get("tokens") || 0;
+  const tokenCost = serviceStats.get("tokenCost") || 0;
+  return {
+    proompts: serviceStats.get("proompts") || 0,
+    tookens: `${prettyTokens(tokens)}${getCostSuffix(tokenCost)}`,
+    ...(config.textModelRateLimit ? { proomptersNow: getUniqueIps() } : {}),
+  };
+}
+
+function getServiceModelStats(accessibleFamilies: Set<ModelFamily>) {
+  const serviceInfo: {
+    [s in LLMService as `${s}${"Keys" | "Orgs"}`]?: number;
+  } = {};
+  const modelFamilyInfo: { [f in ModelFamily]?: BaseFamilyInfo } = {};
+
+  for (const service of LLM_SERVICES) {
+    const hasKeys = serviceStats.get(`${service}__keys`) || 0;
+    if (!hasKeys) continue;
+
+    serviceInfo[`${service}Keys`] = hasKeys;
+    accessibleFamilies.forEach((f) => {
+      if (MODEL_FAMILY_SERVICE[f] === service) {
+        modelFamilyInfo[f] = getInfoForFamily(f);
+      }
+    });
+
+    if (service === "openai" && config.checkKeys) {
+      serviceInfo.openaiOrgs = getUniqueOpenAIOrgs(keyPool.list());
+    }
+  }
+  return { serviceInfo, modelFamilyInfo };
+}
+
+function getUniqueOpenAIOrgs(keys: KeyPoolKey[]) {
+  const orgIds = new Set(
+    keys.filter((k) => k.service === "openai").map((k: any) => k.organizationId)
+  );
+  return orgIds.size;
+}
+
+function increment<T extends keyof AllStats | ModelAggregateKey>(
+  map: Map<T, number>,
+  key: T,
+  delta = 1
+) {
+  map.set(key, (map.get(key) || 0) + delta);
+}
+
+function addKeyToAggregates(k: KeyPoolKey) {
+  increment(serviceStats, "proompts", k.promptCount);
+  increment(serviceStats, "openai__keys", k.service === "openai" ? 1 : 0);
+  increment(serviceStats, "anthropic__keys", k.service === "anthropic" ? 1 : 0);
+  increment(serviceStats, "google-ai__keys", k.service === "google-ai" ? 1 : 0);
+  increment(
+    serviceStats,
+    "mistral-ai__keys",
+    k.service === "mistral-ai" ? 1 : 0
+  );
+  increment(serviceStats, "aws__keys", k.service === "aws" ? 1 : 0);
+  increment(serviceStats, "azure__keys", k.service === "azure" ? 1 : 0);
+
+  let sumTokens = 0;
+  let sumCost = 0;
+
+  switch (k.service) {
+    case "openai":
+      if (!keyIsOpenAIKey(k)) throw new Error("Invalid key type");
+      increment(
+        serviceStats,
+        "openai__uncheckedKeys",
+        Boolean(k.lastChecked) ? 0 : 1
+      );
+
+      k.modelFamilies.forEach((f) => {
+        const tokens = k[`${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, `${f}__overQuota`, k.isOverQuota ? 1 : 0);
+      });
+      break;
+    case "azure":
+      if (!keyIsAzureKey(k)) throw new Error("Invalid key type");
+      k.modelFamilies.forEach((f) => {
+        const tokens = k[`${f}Tokens`];
+        sumTokens += tokens;
+        sumCost += getTokenCostUsd(f, tokens);
+        increment(modelStats, `${f}__tokens`, tokens);
+        increment(modelStats, `${f}__active`, k.isDisabled ? 0 : 1);
+        increment(modelStats, `${f}__revoked`, k.isRevoked ? 1 : 0);
+      });
+      break;
+    case "anthropic": {
+      if (!keyIsAnthropicKey(k)) throw new Error("Invalid key type");
+      k.modelFamilies.forEach((f) => {
+        const tokens = k[`${f}Tokens`];
+        sumTokens += tokens;
+        sumCost += getTokenCostUsd(f, tokens);
+        increment(modelStats, `${f}__tokens`, tokens);
+        increment(modelStats, `${f}__revoked`, k.isRevoked ? 1 : 0);
+        increment(modelStats, `${f}__active`, k.isDisabled ? 0 : 1);
+        increment(modelStats, `${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);
+      });
+      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, `${family}__awsHaiku`, k.haikuEnabled ? 1 : 0);
+
+      // Ignore revoked keys for aws logging stats, but include keys where the
+      // logging status is unknown.
+      const countAsLogged =
+        k.lastChecked && !k.isDisabled && k.awsLoggingStatus !== "disabled";
+      increment(modelStats, `${family}__awsLogged`, countAsLogged ? 1 : 0);
+
+      break;
+    }
+    default:
+      assertNever(k.service);
+  }
+
+  increment(serviceStats, "tokens", sumTokens);
+  increment(serviceStats, "tokenCost", sumCost);
+}
+
+function getInfoForFamily(family: ModelFamily): BaseFamilyInfo {
+  const tokens = modelStats.get(`${family}__tokens`) || 0;
+  const cost = getTokenCostUsd(family, tokens);
+  let info: BaseFamilyInfo & OpenAIInfo & AnthropicInfo & AwsInfo = {
+    usage: `${prettyTokens(tokens)} tokens${getCostSuffix(cost)}`,
+    activeKeys: modelStats.get(`${family}__active`) || 0,
+    revokedKeys: modelStats.get(`${family}__revoked`) || 0,
+  };
+
+  // Add service-specific stats to the info object.
+  if (config.checkKeys) {
+    const service = MODEL_FAMILY_SERVICE[family];
+    switch (service) {
+      case "openai":
+        info.overQuotaKeys = modelStats.get(`${family}__overQuota`) || 0;
+        info.trialKeys = modelStats.get(`${family}__trial`) || 0;
+
+        // Delete trial/revoked keys for non-turbo families.
+        // Trials are turbo 99% of the time, and if a key is invalid we don't
+        // know what models it might have had assigned to it.
+        if (family !== "turbo") {
+          delete info.trialKeys;
+          delete info.revokedKeys;
+        }
+        break;
+      case "anthropic":
+        info.overQuotaKeys = modelStats.get(`${family}__overQuota`) || 0;
+        info.prefilledKeys = modelStats.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.`;
+        }
+        break;
+    }
+  }
+
+  // Add queue stats to the info object.
+  const queue = getQueueInformation(family);
+  info.proomptersInQueue = queue.proomptersInQueue;
+  info.estimatedQueueTime = queue.estimatedQueueTime;
+
+  return info;
+}
+
+/** Returns queue time in seconds, or minutes + seconds if over 60 seconds. */
+function getQueueInformation(partition: ModelFamily) {
+  const waitMs = getEstimatedWaitTime(partition);
+  const waitTime =
+    waitMs < 60000
+      ? `${Math.round(waitMs / 1000)}sec`
+      : `${Math.round(waitMs / 60000)}min, ${Math.round(
+          (waitMs % 60000) / 1000
+        )}sec`;
+  return {
+    proomptersInQueue: getQueueLength(partition),
+    estimatedQueueTime: waitMs > 2000 ? waitTime : "no wait",
+  };
+}

src/shared/api-support/index.ts

@@ -0,0 +1,84 @@
+import type { Request, Response } from "express";
+import { z } from "zod";
+import { APIFormat } from "../key-management";
+import { AnthropicV1MessagesSchema } from "./kits/anthropic-chat/schema";
+import { AnthropicV1TextSchema } from "./kits/anthropic-text/schema";
+import { transformOpenAIToAnthropicText } from "./kits/anthropic-text/request-transformers";
+import {
+  transformAnthropicTextToAnthropicChat,
+  transformOpenAIToAnthropicChat,
+} from "./kits/anthropic-chat/request-transformers";
+import { GoogleAIV1GenerateContentSchema } from "./kits/google-ai/schema";
+import { transformOpenAIToGoogleAI } from "./kits/google-ai/request-transformers";
+import { MistralAIV1ChatCompletionsSchema } from "./kits/mistral-ai/schema";
+
+import { OpenAIV1ChatCompletionSchema } from "./kits/openai/schema";
+import { OpenAIV1ImagesGenerationSchema } from "./kits/openai-image/schema";
+import { transformOpenAIToOpenAIImage } from "./kits/openai-image/request-transformers";
+import { OpenAIV1TextCompletionSchema } from "./kits/openai-text/schema";
+import { transformOpenAIToOpenAIText } from "./kits/openai-text/request-transformers";
+
+export type APIRequestTransformer<Z extends z.ZodType<any, any>> = (
+  req: Request
+) => Promise<z.infer<Z>>;
+
+export type APIResponseTransformer<Z extends z.ZodType<any, any>> = (
+  res: Response
+) => Promise<z.infer<Z>>;
+
+/** Represents a transformation from one API format to another. */
+type APITransformation = `${APIFormat}->${APIFormat}`;
+
+type APIRequestTransformerMap = {
+  [key in APITransformation]?: APIRequestTransformer<any>;
+};
+
+type APIResponseTransformerMap = {
+  [key in APITransformation]?: APIResponseTransformer<any>;
+};
+
+export const API_REQUEST_TRANSFORMERS: APIRequestTransformerMap = {
+  "anthropic-text->anthropic-chat": transformAnthropicTextToAnthropicChat,
+  "openai->anthropic-chat": transformOpenAIToAnthropicChat,
+  "openai->anthropic-text": transformOpenAIToAnthropicText,
+  "openai->openai-text": transformOpenAIToOpenAIText,
+  "openai->openai-image": transformOpenAIToOpenAIImage,
+  "openai->google-ai": transformOpenAIToGoogleAI,
+};
+
+export const API_REQUEST_VALIDATORS: Record<APIFormat, z.ZodSchema<any>> = {
+  "anthropic-chat": AnthropicV1MessagesSchema,
+  "anthropic-text": AnthropicV1TextSchema,
+  openai: OpenAIV1ChatCompletionSchema,
+  "openai-text": OpenAIV1TextCompletionSchema,
+  "openai-image": OpenAIV1ImagesGenerationSchema,
+  "google-ai": GoogleAIV1GenerateContentSchema,
+  "mistral-ai": MistralAIV1ChatCompletionsSchema,
+};
+export { AnthropicChatMessage } from "./kits/anthropic-chat/schema";
+export { AnthropicV1MessagesSchema } from "./kits/anthropic-chat/schema";
+export { AnthropicV1TextSchema } from "./kits/anthropic-text/schema";
+
+export interface APIFormatKit<T extends APIFormat, P> {
+  name: T;
+  /** Zod schema for validating requests in this format. */
+  requestValidator: z.ZodSchema<any>;
+  /** Flattens non-sting prompts (such as message arrays) into a single string. */
+  promptStringifier: (prompt: P) => string;
+  /** Counts the number of tokens in a prompt. */
+  promptTokenCounter: (prompt: P, model: string) => Promise<number>;
+  /** Counts the number of tokens in a completion. */
+  completionTokenCounter: (
+    completion: string,
+    model: string
+  ) => Promise<number>;
+  /** Functions which transform requests from other formats into this format. */
+  requestTransformers: APIRequestTransformerMap;
+  /** Functions which transform responses from this format into other formats. */
+  responseTransformers: APIResponseTransformerMap;
+}
+export { GoogleAIChatMessage } from "./kits/google-ai";
+export { MistralAIChatMessage } from "./kits/mistral-ai";
+
+export { OpenAIChatMessage } from "./kits/openai/schema";
+export { flattenAnthropicMessages } from "./kits/anthropic-chat/stringifier";

src/shared/api-support/kits/README.md

@@ -0,0 +1,4 @@
+# API Kits
+This directory contains "kits" for each supported language model API. Each kit implements the `APIFormatKit` interface and provides functionality that the proxy application needs to be able to validate requests, transform prompts and responses, tokenize text, and so forth.
+
+## Structure

src/shared/api-support/kits/anthropic-chat/request-transformers.ts

@@ -0,0 +1,290 @@
+import { AnthropicChatMessage, AnthropicV1MessagesSchema } from "./schema";
+import { AnthropicV1TextSchema, APIRequestTransformer, OpenAIChatMessage } from "../../index";
+import { BadRequestError } from "../../../errors";
+
+import { OpenAIV1ChatCompletionSchema } from "../openai/schema";
+
+/**
+ * Represents the union of all content types without the `string` shorthand
+ * for `text` content.
+ */
+type AnthropicChatMessageContentWithoutString = Exclude<
+  AnthropicChatMessage["content"],
+  string
+>;
+/** Represents a message with all shorthand `string` content expanded. */
+type ConvertedAnthropicChatMessage = AnthropicChatMessage & {
+  content: AnthropicChatMessageContentWithoutString;
+};
+
+export const transformOpenAIToAnthropicChat: APIRequestTransformer<
+  typeof AnthropicV1MessagesSchema
+> = async (req) => {
+  const { body } = req;
+  const result = OpenAIV1ChatCompletionSchema.safeParse(body);
+  if (!result.success) {
+    req.log.warn(
+      { issues: result.error.issues, body },
+      "Invalid OpenAI-to-Anthropic Chat request"
+    );
+    throw result.error;
+  }
+
+  req.headers["anthropic-version"] = "2023-06-01";
+
+  const { messages, ...rest } = result.data;
+  const { messages: newMessages, system } =
+    openAIMessagesToClaudeChatPrompt(messages);
+
+  return {
+    system,
+    messages: newMessages,
+    model: rest.model,
+    max_tokens: rest.max_tokens,
+    stream: rest.stream,
+    temperature: rest.temperature,
+    top_p: rest.top_p,
+    stop_sequences: typeof rest.stop === "string" ? [rest.stop] : rest.stop,
+    ...(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,
+    // and function calls, but Anthropic does not.
+  };
+};
+
+/**
+ * Converts an older Anthropic Text Completion prompt to the newer Messages API
+ * by splitting the flat text into messages.
+ */
+export const transformAnthropicTextToAnthropicChat: APIRequestTransformer<
+  typeof AnthropicV1MessagesSchema
+> = async (req) => {
+  const { body } = req;
+  const result = AnthropicV1TextSchema.safeParse(body);
+  if (!result.success) {
+    req.log.warn(
+      { issues: result.error.issues, body },
+      "Invalid Anthropic Text-to-Anthropic Chat request"
+    );
+    throw result.error;
+  }
+
+  req.headers["anthropic-version"] = "2023-06-01";
+
+  const { model, max_tokens_to_sample, prompt, ...rest } = result.data;
+  validateAnthropicTextPrompt(prompt);
+
+  // Iteratively slice the prompt into messages. Start from the beginning and
+  // look for the next `\n\nHuman:` or `\n\nAssistant:`. Anything before the
+  // first human message is a system message.
+  let index = prompt.indexOf("\n\nHuman:");
+  let remaining = prompt.slice(index);
+  const system = prompt.slice(0, index);
+  const messages: AnthropicChatMessage[] = [];
+  while (remaining) {
+    const isHuman = remaining.startsWith("\n\nHuman:");
+
+    // Multiple messages from the same role are not permitted in Messages API.
+    // We collect all messages until the next message from the opposite role.
+    const thisRole = isHuman ? "\n\nHuman:" : "\n\nAssistant:";
+    const nextRole = isHuman ? "\n\nAssistant:" : "\n\nHuman:";
+    const nextIndex = remaining.indexOf(nextRole);
+
+    // Collect text up to the next message, or the end of the prompt for the
+    // Assistant prefill if present.
+    const msg = remaining
+      .slice(0, nextIndex === -1 ? undefined : nextIndex)
+      .replace(thisRole, "")
+      .trimStart();
+
+    const role = isHuman ? "user" : "assistant";
+    messages.push({ role, content: msg });
+    remaining = remaining.slice(nextIndex);
+
+    if (nextIndex === -1) break;
+  }
+
+  // fix "messages: final assistant content cannot end with trailing whitespace"
+  const lastMessage = messages[messages.length - 1];
+  if (
+    lastMessage.role === "assistant" &&
+    typeof lastMessage.content === "string"
+  ) {
+    messages[messages.length - 1].content = lastMessage.content.trimEnd();
+  }
+
+  return {
+    model,
+    system,
+    messages,
+    max_tokens: max_tokens_to_sample,
+    ...rest,
+  };
+};
+
+function validateAnthropicTextPrompt(prompt: string) {
+  if (!prompt.includes("\n\nHuman:") || !prompt.includes("\n\nAssistant:")) {
+    throw new BadRequestError(
+      "Prompt must contain at least one human and one assistant message."
+    );
+  }
+  // First human message must be before first assistant message
+  const firstHuman = prompt.indexOf("\n\nHuman:");
+  const firstAssistant = prompt.indexOf("\n\nAssistant:");
+  if (firstAssistant < firstHuman) {
+    throw new BadRequestError(
+      "First Assistant message must come after the first Human message."
+    );
+  }
+}
+
+function openAIMessagesToClaudeChatPrompt(messages: OpenAIChatMessage[]): {
+  messages: AnthropicChatMessage[];
+  system: string;
+} {
+  // Similar formats, but Claude doesn't use `name` property and doesn't have
+  // a `system` role.  Also, Claude does not allow consecutive messages from
+  // the same role, so we need to merge them.
+  // 1. Collect all system messages up to the first non-system message and set
+  // that as the `system` prompt.
+  // 2. Iterate through messages and:
+  //   - If the message is from system, reassign it to assistant with System:
+  //     prefix.
+  //   - If message is from same role as previous, append it to the previous
+  //     message rather than creating a new one.
+  //   - Otherwise, create a new message and prefix with `name` if present.
+
+  // TODO: When a Claude message has multiple `text` contents, does the internal
+  // message flattening insert newlines between them?  If not, we may need to
+  // do that here...
+
+  let firstNonSystem = -1;
+  const result: { messages: ConvertedAnthropicChatMessage[]; system: string } =
+    { messages: [], system: "" };
+  for (let i = 0; i < messages.length; i++) {
+    const msg = messages[i];
+    const isSystem = isSystemOpenAIRole(msg.role);
+
+    if (firstNonSystem === -1 && isSystem) {
+      // Still merging initial system messages into the system prompt
+      result.system += getFirstTextContent(msg.content) + "\n";
+      continue;
+    }
+
+    if (firstNonSystem === -1 && !isSystem) {
+      // Encountered the first non-system message
+      firstNonSystem = i;
+
+      if (msg.role === "assistant") {
+        // There is an annoying rule that the first message must be from the user.
+        // This is commonly not the case with roleplay prompts that start with a
+        // block of system messages followed by an assistant message. We will try
+        // to reconcile this by splicing the last line of the system prompt into
+        // a beginning user message -- this is *commonly* ST's [Start a new chat]
+        // nudge, which works okay as a user message.
+
+        // Find the last non-empty line in the system prompt
+        const execResult = /(?:[^\r\n]*\r?\n)*([^\r\n]+)(?:\r?\n)*/d.exec(
+          result.system
+        );
+
+        let text = "";
+        if (execResult) {
+          text = execResult[1];
+          // Remove last line from system so it doesn't get duplicated
+          const [_, [lastLineStart]] = execResult.indices || [];
+          result.system = result.system.slice(0, lastLineStart);
+        } else {
+          // This is a bad prompt; there's no system content to move to user and
+          // it starts with assistant. We don't have any good options.
+          text = "[ Joining chat... ]";
+        }
+
+        result.messages.push({
+          role: "user",
+          content: [{ type: "text", text }],
+        });
+      }
+    }
+
+    const last = result.messages[result.messages.length - 1];
+    // I have to handle tools as system messages to be exhaustive here but the
+    // experience will be bad.
+    const role = isSystemOpenAIRole(msg.role) ? "assistant" : msg.role;
+
+    // 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 content = convertOpenAIContent(msg.content);
+
+    // Prepend the display name to the first text content in the current message
+    // if it exists. We don't need to add the name to every content block.
+    if (name?.length) {
+      const firstTextContent = content.find((c) => c.type === "text");
+      if (firstTextContent && "text" in firstTextContent) {
+        // This mutates the element in `content`.
+        firstTextContent.text = `${name}: ${firstTextContent.text}`;
+      }
+    }
+
+    // Merge messages if necessary. If two assistant roles are consecutive but
+    // had different names, the final converted assistant message will have
+    // multiple characters in it, but the name prefixes should assist the model
+    // in differentiating between speakers.
+    if (last && last.role === role) {
+      last.content.push(...content);
+    } else {
+      result.messages.push({ role, content });
+    }
+  }
+
+  result.system = result.system.trimEnd();
+  return result;
+}
+
+function isSystemOpenAIRole(
+  role: OpenAIChatMessage["role"]
+): role is "system" | "function" | "tool" {
+  return ["system", "function", "tool"].includes(role);
+}
+
+function getFirstTextContent(content: OpenAIChatMessage["content"]) {
+  if (typeof content === "string") return content;
+  for (const c of content) {
+    if ("text" in c) return c.text;
+  }
+  return "[ No text content in this message ]";
+}
+
+function convertOpenAIContent(
+  content: OpenAIChatMessage["content"]
+): AnthropicChatMessageContentWithoutString {
+  if (typeof content === "string") {
+    return [{ type: "text", text: content.trimEnd() }];
+  }
+
+  return content.map((c) => {
+    if ("text" in c) {
+      return { type: "text", text: c.text.trimEnd() };
+    } else if ("image_url" in c) {
+      const url = c.image_url.url;
+      try {
+        const mimeType = url.split(";")[0].split(":")[1];
+        const data = url.split(",")[1];
+        return {
+          type: "image",
+          source: { type: "base64", media_type: mimeType, data },
+        };
+      } catch (e) {
+        return {
+          type: "text",
+          text: `[ Unsupported image URL: ${url.slice(0, 200)} ]`,
+        };
+      }
+    } else {
+      const type = String((c as any)?.type);
+      return { type: "text", text: `[ Unsupported content type: ${type} ]` };
+    }
+  });
+}

src/shared/api-support/kits/anthropic-chat/schema.ts

@@ -0,0 +1,52 @@
+import { z } from "zod";
+import { config } from "../../../../config";
+
+const CLAUDE_OUTPUT_MAX = config.maxOutputTokensAnthropic;
+
+export const AnthropicV1BaseSchema = z
+  .object({
+    model: z.string().max(100),
+    stop_sequences: z.array(z.string().max(500)).optional(),
+    stream: z.boolean().optional().default(false),
+    temperature: z.coerce.number().optional().default(1),
+    top_k: z.coerce.number().optional(),
+    top_p: z.coerce.number().optional(),
+    metadata: z.object({ user_id: z.string().optional() }).optional(),
+  })
+  .strip();
+const AnthropicV1MessageMultimodalContentSchema = z.array(
+  z.union([
+    z.object({ type: z.literal("text"), text: z.string() }),
+    z.object({
+      type: z.literal("image"),
+      source: z.object({
+        type: z.literal("base64"),
+        media_type: z.string().max(100),
+        data: z.string(),
+      }),
+    }),
+  ])
+);
+
+// https://docs.anthropic.com/claude/reference/messages_post
+export const AnthropicV1MessagesSchema = AnthropicV1BaseSchema.merge(
+  z.object({
+    messages: z.array(
+      z.object({
+        role: z.enum(["user", "assistant"]),
+        content: z.union([
+          z.string(),
+          AnthropicV1MessageMultimodalContentSchema,
+        ]),
+      })
+    ),
+    max_tokens: z
+      .number()
+      .int()
+      .transform((v) => Math.min(v, CLAUDE_OUTPUT_MAX)),
+    system: z.string().optional(),
+  })
+);
+export type AnthropicChatMessage = z.infer<
+  typeof AnthropicV1MessagesSchema
+>["messages"][0];

src/shared/api-support/kits/anthropic-chat/stringifier.ts

@@ -0,0 +1,21 @@
+import { AnthropicChatMessage } from "./schema";
+
+export function flattenAnthropicMessages(
+  messages: AnthropicChatMessage[]
+): string {
+  return messages
+    .map((msg) => {
+      const name = msg.role === "user" ? "\n\nHuman: " : "\n\nAssistant: ";
+      const parts = Array.isArray(msg.content)
+        ? msg.content
+        : [{ type: "text", text: msg.content }];
+      return `${name}: ${parts
+        .map((part) =>
+          part.type === "text"
+            ? part.text
+            : `[Omitted multimodal content of type ${part.type}]`
+        )
+        .join("\n")}`;
+    })
+    .join("\n\n");
+}

src/shared/api-support/kits/anthropic-text/request-transformers.ts

@@ -0,0 +1,73 @@
+import {
+  AnthropicV1TextSchema,
+  APIRequestTransformer,
+  OpenAIChatMessage,
+} from "../../index";
+
+import { OpenAIV1ChatCompletionSchema } from "../openai/schema";
+
+import { flattenOpenAIMessageContent } from "../openai/stringifier";
+
+export const transformOpenAIToAnthropicText: APIRequestTransformer<
+  typeof AnthropicV1TextSchema
+> = async (req) => {
+  const { body } = req;
+  const result = OpenAIV1ChatCompletionSchema.safeParse(body);
+  if (!result.success) {
+    req.log.warn(
+      { issues: result.error.issues, body },
+      "Invalid OpenAI-to-Anthropic Text request"
+    );
+    throw result.error;
+  }
+
+  req.headers["anthropic-version"] = "2023-06-01";
+
+  const { messages, ...rest } = result.data;
+  const prompt = openAIMessagesToClaudeTextPrompt(messages);
+
+  let stops = rest.stop
+    ? Array.isArray(rest.stop)
+      ? rest.stop
+      : [rest.stop]
+    : [];
+  // Recommended by Anthropic
+  stops.push("\n\nHuman:");
+  // Helps with jailbreak prompts that send fake system messages and multi-bot
+  // chats that prefix bot messages with "System: Respond as <bot name>".
+  stops.push("\n\nSystem:");
+  // Remove duplicates
+  stops = [...new Set(stops)];
+
+  return {
+    model: rest.model,
+    prompt: prompt,
+    max_tokens_to_sample: rest.max_tokens,
+    stop_sequences: stops,
+    stream: rest.stream,
+    temperature: rest.temperature,
+    top_p: rest.top_p,
+  };
+};
+
+function openAIMessagesToClaudeTextPrompt(messages: OpenAIChatMessage[]) {
+  return (
+    messages
+      .map((m) => {
+        let role: string = m.role;
+        if (role === "assistant") {
+          role = "Assistant";
+        } else if (role === "system") {
+          role = "System";
+        } else if (role === "user") {
+          role = "Human";
+        }
+        const name = m.name?.trim();
+        const content = flattenOpenAIMessageContent(m.content);
+        // https://console.anthropic.com/docs/prompt-design
+        // `name` isn't supported by Anthropic but we can still try to use it.
+        return `\n\n${role}: ${name ? `(as ${name}) ` : ""}${content}`;
+      })
+      .join("") + "\n\nAssistant:"
+  );
+}

src/shared/api-support/kits/anthropic-text/schema.ts

@@ -0,0 +1,16 @@
+import { z } from "zod";
+import { AnthropicV1BaseSchema } from "../anthropic-chat/schema";
+import { config } from "../../../../config";
+
+const CLAUDE_OUTPUT_MAX = config.maxOutputTokensAnthropic;
+
+// https://docs.anthropic.com/claude/reference/complete_post [deprecated]
+export const AnthropicV1TextSchema = AnthropicV1BaseSchema.merge(
+  z.object({
+    prompt: z.string(),
+    max_tokens_to_sample: z.coerce
+      .number()
+      .int()
+      .transform((v) => Math.min(v, CLAUDE_OUTPUT_MAX)),
+  })
+);

src/shared/api-support/kits/google-ai/index.ts

@@ -0,0 +1 @@
+export { GoogleAIChatMessage } from "./schema";

src/shared/api-support/kits/google-ai/request-transformers.ts

@@ -0,0 +1,92 @@
+import { APIRequestTransformer, GoogleAIChatMessage } from "../../index";
+import { GoogleAIV1GenerateContentSchema } from "./schema";
+
+import { OpenAIV1ChatCompletionSchema } from "../openai/schema";
+
+import { flattenOpenAIMessageContent } from "../openai/stringifier";
+
+export const transformOpenAIToGoogleAI: APIRequestTransformer<
+  typeof GoogleAIV1GenerateContentSchema
+> = async (req) => {
+  const { body } = req;
+  const result = OpenAIV1ChatCompletionSchema.safeParse({
+    ...body,
+    model: "gpt-3.5-turbo",
+  });
+  if (!result.success) {
+    req.log.warn(
+      { issues: result.error.issues, body },
+      "Invalid OpenAI-to-Google AI request"
+    );
+    throw result.error;
+  }
+
+  const { messages, ...rest } = result.data;
+  const foundNames = new Set<string>();
+  const contents = messages
+    .map((m) => {
+      const role = m.role === "assistant" ? "model" : "user";
+      // Detects character names so we can set stop sequences for them as Gemini
+      // is prone to continuing as the next character.
+      // If names are not available, we'll still try to prefix the message
+      // with generic names so we can set stops for them but they don't work
+      // as well as real names.
+      const text = flattenOpenAIMessageContent(m.content);
+      const propName = m.name?.trim();
+      const textName =
+        m.role === "system" ? "" : text.match(/^(.{0,50}?): /)?.[1]?.trim();
+      const name =
+        propName || textName || (role === "model" ? "Character" : "User");
+
+      foundNames.add(name);
+
+      // Prefixing messages with their character name seems to help avoid
+      // Gemini trying to continue as the next character, or at the very least
+      // ensures it will hit the stop sequence.  Otherwise it will start a new
+      // paragraph and switch perspectives.
+      // The response will be very likely to include this prefix so frontends
+      // will need to strip it out.
+      const textPrefix = textName ? "" : `${name}: `;
+      return {
+        parts: [{ text: textPrefix + text }],
+        role: m.role === "assistant" ? ("model" as const) : ("user" as const),
+      };
+    })
+    .reduce<GoogleAIChatMessage[]>((acc, msg) => {
+      const last = acc[acc.length - 1];
+      if (last?.role === msg.role) {
+        last.parts[0].text += "\n\n" + msg.parts[0].text;
+      } else {
+        acc.push(msg);
+      }
+      return acc;
+    }, []);
+
+  let stops = rest.stop
+    ? Array.isArray(rest.stop)
+      ? rest.stop
+      : [rest.stop]
+    : [];
+  stops.push(...Array.from(foundNames).map((name) => `\n${name}:`));
+  stops = [...new Set(stops)].slice(0, 5);
+
+  return {
+    model: "gemini-pro",
+    stream: rest.stream,
+    contents,
+    tools: [],
+    generationConfig: {
+      maxOutputTokens: rest.max_tokens,
+      stopSequences: stops,
+      topP: rest.top_p,
+      topK: 40, // openai schema doesn't have this, google ai defaults to 40
+      temperature: rest.temperature,
+    },
+    safetySettings: [
+      { category: "HARM_CATEGORY_HARASSMENT", threshold: "BLOCK_NONE" },
+      { category: "HARM_CATEGORY_HATE_SPEECH", threshold: "BLOCK_NONE" },
+      { category: "HARM_CATEGORY_SEXUALLY_EXPLICIT", threshold: "BLOCK_NONE" },
+      { category: "HARM_CATEGORY_DANGEROUS_CONTENT", threshold: "BLOCK_NONE" },
+    ],
+  };
+};

src/shared/api-support/kits/google-ai/schema.ts

@@ -0,0 +1,34 @@
+import { z } from "zod";
+
+// 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"]),
+      })
+    ),
+    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(),
+    }),
+  })
+  .strip();
+
+export type GoogleAIChatMessage = z.infer<
+  typeof GoogleAIV1GenerateContentSchema
+>["contents"][0];

src/shared/api-support/kits/mistral-ai/index.ts

@@ -0,0 +1 @@
+export { MistralAIChatMessage } from "./schema";

src/shared/api-support/kits/mistral-ai/request-transformers.ts

@@ -0,0 +1,35 @@
+import { MistralAIChatMessage } from "./schema";
+
+export function fixMistralPrompt(
+  messages: MistralAIChatMessage[]
+): MistralAIChatMessage[] {
+  // Mistral uses OpenAI format but has some additional requirements:
+  // - Only one system message per request, and it must be the first message if
+  //   present.
+  // - Final message must be a user message.
+  // - Cannot have multiple messages from the same role in a row.
+  // While frontends should be able to handle this, we can fix it here in the
+  // meantime.
+
+  return messages.reduce<MistralAIChatMessage[]>((acc, msg) => {
+    if (acc.length === 0) {
+      acc.push(msg);
+      return acc;
+    }
+
+    const copy = { ...msg };
+    // Reattribute subsequent system messages to the user
+    if (msg.role === "system") {
+      copy.role = "user";
+    }
+
+    // Consolidate multiple messages from the same role
+    const last = acc[acc.length - 1];
+    if (last.role === copy.role) {
+      last.content += "\n\n" + copy.content;
+    } else {
+      acc.push(copy);
+    }
+    return acc;
+  }, []);
+}

src/shared/api-support/kits/mistral-ai/schema.ts

@@ -0,0 +1,28 @@
+// https://docs.mistral.ai/api#operation/createChatCompletion
+import { z } from "zod";
+
+
+import { OPENAI_OUTPUT_MAX } from "../openai/schema";
+
+export const MistralAIV1ChatCompletionsSchema = z.object({
+  model: z.string(),
+  messages: z.array(
+    z.object({
+      role: z.enum(["system", "user", "assistant"]),
+      content: z.string(),
+    })
+  ),
+  temperature: z.number().optional().default(0.7),
+  top_p: z.number().optional().default(1),
+  max_tokens: z.coerce
+    .number()
+    .int()
+    .nullish()
+    .transform((v) => Math.min(v ?? OPENAI_OUTPUT_MAX, OPENAI_OUTPUT_MAX)),
+  stream: z.boolean().optional().default(false),
+  safe_prompt: z.boolean().optional().default(false),
+  random_seed: z.number().int().optional(),
+});
+export type MistralAIChatMessage = z.infer<
+  typeof MistralAIV1ChatCompletionsSchema
+>["messages"][0];

src/shared/api-support/kits/openai-image/request-transformers.ts

@@ -0,0 +1,51 @@
+/* Takes the last chat message and uses it verbatim as the image prompt. */
+import { APIRequestTransformer } from "../../index";
+import { OpenAIV1ImagesGenerationSchema } from "./schema";
+import { OpenAIV1ChatCompletionSchema } from "../openai/schema";
+
+export const transformOpenAIToOpenAIImage: APIRequestTransformer<
+  typeof OpenAIV1ImagesGenerationSchema
+> = async (req) => {
+  const { body } = req;
+  const result = OpenAIV1ChatCompletionSchema.safeParse(body);
+  if (!result.success) {
+    req.log.warn(
+      { issues: result.error.issues, body },
+      "Invalid OpenAI-to-OpenAI-image request"
+    );
+    throw result.error;
+  }
+
+  const { messages } = result.data;
+  const prompt = messages.filter((m) => m.role === "user").pop()?.content;
+  if (Array.isArray(prompt)) {
+    throw new Error("Image generation prompt must be a text message.");
+  }
+
+  if (body.stream) {
+    throw new Error(
+      "Streaming is not supported for image generation requests."
+    );
+  }
+
+  // Some frontends do weird things with the prompt, like prefixing it with a
+  // character name or wrapping the entire thing in quotes. We will look for
+  // the index of "Image:" and use everything after that as the prompt.
+
+  const index = prompt?.toLowerCase().indexOf("image:");
+  if (index === -1 || !prompt) {
+    throw new Error(
+      `Start your prompt with 'Image:' followed by a description of the image you want to generate (received: ${prompt}).`
+    );
+  }
+
+  // TODO: Add some way to specify parameters via chat message
+  const transformed = {
+    model: body.model.includes("dall-e") ? body.model : "dall-e-3",
+    quality: "standard",
+    size: "1024x1024",
+    response_format: "url",
+    prompt: prompt.slice(index! + 6).trim(),
+  };
+  return OpenAIV1ImagesGenerationSchema.parse(transformed);
+};

src/shared/api-support/kits/openai-image/schema.ts

@@ -0,0 +1,18 @@
+// https://platform.openai.com/docs/api-reference/images/create
+import { z } from "zod";
+
+export const OpenAIV1ImagesGenerationSchema = z
+  .object({
+    prompt: z.string().max(4000),
+    model: z.string().max(100).optional(),
+    quality: z.enum(["standard", "hd"]).optional().default("standard"),
+    n: z.number().int().min(1).max(4).optional().default(1),
+    response_format: z.enum(["url", "b64_json"]).optional(),
+    size: z
+      .enum(["256x256", "512x512", "1024x1024", "1792x1024", "1024x1792"])
+      .optional()
+      .default("1024x1024"),
+    style: z.enum(["vivid", "natural"]).optional().default("vivid"),
+    user: z.string().max(500).optional(),
+  })
+  .strip();

src/shared/api-support/kits/openai-text/request-transformers.ts

@@ -0,0 +1,33 @@
+import { APIRequestTransformer } from "../../index";
+import { OpenAIV1TextCompletionSchema } from "./schema";
+import { OpenAIV1ChatCompletionSchema } from "../openai/schema";
+
+import { flattenOpenAIChatMessages } from "../openai/stringifier";
+
+export const transformOpenAIToOpenAIText: APIRequestTransformer<
+  typeof OpenAIV1TextCompletionSchema
+> = async (req) => {
+  const { body } = req;
+  const result = OpenAIV1ChatCompletionSchema.safeParse(body);
+  if (!result.success) {
+    req.log.warn(
+      { issues: result.error.issues, body },
+      "Invalid OpenAI-to-OpenAI-text request"
+    );
+    throw result.error;
+  }
+
+  const { messages, ...rest } = result.data;
+  const prompt = flattenOpenAIChatMessages(messages);
+
+  let stops = rest.stop
+    ? Array.isArray(rest.stop)
+      ? rest.stop
+      : [rest.stop]
+    : [];
+  stops.push("\n\nUser:");
+  stops = [...new Set(stops)];
+
+  const transformed = { ...rest, prompt: prompt, stop: stops };
+  return OpenAIV1TextCompletionSchema.parse(transformed);
+};

src/shared/api-support/kits/openai-text/schema.ts

@@ -0,0 +1,26 @@
+import { z } from "zod";
+import { OpenAIV1ChatCompletionSchema } from "../openai/schema";
+
+export const OpenAIV1TextCompletionSchema = z
+  .object({
+    model: z
+      .string()
+      .max(100)
+      .regex(
+        /^gpt-3.5-turbo-instruct/,
+        "Model must start with 'gpt-3.5-turbo-instruct'"
+      ),
+    prompt: z.string({
+      required_error:
+        "No `prompt` found. Ensure you've set the correct completion endpoint.",
+    }),
+    logprobs: z.number().int().nullish().default(null),
+    echo: z.boolean().optional().default(false),
+    best_of: z.literal(1).optional(),
+    stop: z
+      .union([z.string().max(500), z.array(z.string().max(500)).max(4)])
+      .optional(),
+    suffix: z.string().max(1000).optional(),
+  })
+  .strip()
+  .merge(OpenAIV1ChatCompletionSchema.omit({ messages: true, logprobs: true }));

src/shared/api-support/kits/openai/index.ts

@@ -0,0 +1,13 @@
+import { APIFormatKit } from "../../index";
+import { OpenAIChatMessage, OpenAIV1ChatCompletionSchema } from "./schema";
+import { flattenOpenAIChatMessages } from "./stringifier";
+import { getOpenAITokenCount } from "./tokenizer";
+
+const kit: APIFormatKit<"openai", OpenAIChatMessage[]> = {
+  name: "openai",
+  requestValidator: OpenAIV1ChatCompletionSchema,
+  // We never transform from other formats into OpenAI format.
+  requestTransformers: {},
+  promptStringifier: flattenOpenAIChatMessages,
+  promptTokenCounter: getOpenAITokenCount,
+};

src/shared/api-support/kits/openai/schema.ts

@@ -0,0 +1,82 @@
+import { z } from "zod";
+import { config } from "../../../../config";
+
+export const OPENAI_OUTPUT_MAX = config.maxOutputTokensOpenAI;
+// https://platform.openai.com/docs/api-reference/chat/create
+const OpenAIV1ChatContentArraySchema = z.array(
+  z.union([
+    z.object({ type: z.literal("text"), text: z.string() }),
+    z.object({
+      type: z.union([z.literal("image"), z.literal("image_url")]),
+      image_url: z.object({
+        url: z.string().url(),
+        detail: z.enum(["low", "auto", "high"]).optional().default("auto"),
+      }),
+    }),
+  ])
+);
+export const OpenAIV1ChatCompletionSchema = z
+  .object({
+    model: z.string().max(100),
+    messages: z.array(
+      z.object({
+        role: z.enum(["system", "user", "assistant", "tool", "function"]),
+        content: z.union([z.string(), OpenAIV1ChatContentArraySchema]),
+        name: z.string().optional(),
+        tool_calls: z.array(z.any()).optional(),
+        function_call: z.array(z.any()).optional(),
+        tool_call_id: z.string().optional(),
+      }),
+      {
+        required_error:
+          "No `messages` found. Ensure you've set the correct completion endpoint.",
+        invalid_type_error:
+          "Messages were not formatted correctly. Refer to the OpenAI Chat API documentation for more information.",
+      }
+    ),
+    temperature: z.number().optional().default(1),
+    top_p: z.number().optional().default(1),
+    n: z
+      .literal(1, {
+        errorMap: () => ({
+          message: "You may only request a single completion at a time.",
+        }),
+      })
+      .optional(),
+    stream: z.boolean().optional().default(false),
+    stop: z
+      .union([z.string().max(500), z.array(z.string().max(500))])
+      .optional(),
+    max_tokens: z.coerce
+      .number()
+      .int()
+      .nullish()
+      .default(Math.min(OPENAI_OUTPUT_MAX, 4096))
+      .transform((v) => Math.min(v ?? OPENAI_OUTPUT_MAX, OPENAI_OUTPUT_MAX)),
+    frequency_penalty: z.number().optional().default(0),
+    presence_penalty: z.number().optional().default(0),
+    logit_bias: z.any().optional(),
+    user: z.string().max(500).optional(),
+    seed: z.number().int().optional(),
+    // Be warned that Azure OpenAI combines these two into a single field.
+    // It's the only deviation from the OpenAI API that I'm aware of so I have
+    // special cased it in `addAzureKey` rather than expecting clients to do it.
+    logprobs: z.boolean().optional(),
+    top_logprobs: z.number().int().optional(),
+    // Quickly adding some newer tool usage params, not tested. They will be
+    // passed through to the API as-is.
+    tools: z.array(z.any()).optional(),
+    functions: z.array(z.any()).optional(),
+    tool_choice: z.any().optional(),
+    function_choice: z.any().optional(),
+    response_format: z.any(),
+  })
+  // Tool usage must be enabled via config because we currently have no way to
+  // track quota usage for them or enforce limits.
+  .omit(
+    Boolean(config.allowOpenAIToolUsage) ? {} : { tools: true, functions: true }
+  )
+  .strip();
+export type OpenAIChatMessage = z.infer<
+  typeof OpenAIV1ChatCompletionSchema
+>["messages"][0];

src/shared/api-support/kits/openai/stringifier.ts

@@ -0,0 +1,33 @@
+import { OpenAIChatMessage } from "./schema";
+
+export function flattenOpenAIChatMessages(messages: OpenAIChatMessage[]) {
+  return (
+    messages
+      .map((m) => {
+        // Claude-style human/assistant turns
+        let role: string = m.role;
+        if (role === "assistant") {
+          role = "Assistant";
+        } else if (role === "system") {
+          role = "System";
+        } else if (role === "user") {
+          role = "User";
+        }
+        return `\n\n${role}: ${flattenOpenAIMessageContent(m.content)}`;
+      })
+      .join("") + "\n\nAssistant:"
+  );
+}
+
+export function flattenOpenAIMessageContent(
+  content: OpenAIChatMessage["content"],
+): string {
+  return Array.isArray(content)
+    ? content
+      .map((contentItem) => {
+        if ("text" in contentItem) return contentItem.text;
+        if ("image_url" in contentItem) return "[ Uploaded Image Omitted ]";
+      })
+      .join("\n")
+    : content;
+}

src/shared/api-support/kits/openai/tokenizer.ts

@@ -0,0 +1,154 @@
+import { Tiktoken } from "tiktoken/lite";
+import cl100k_base from "tiktoken/encoders/cl100k_base.json";
+import { logger } from "../../../../logger";
+import { libSharp } from "../../../file-storage";
+import { OpenAIChatMessage } from "./schema";
+
+const GPT4_VISION_SYSTEM_PROMPT_SIZE = 170;
+
+const log = logger.child({ module: "tokenizer", service: "openai" });
+export const encoder = new Tiktoken(
+  cl100k_base.bpe_ranks,
+  cl100k_base.special_tokens,
+  cl100k_base.pat_str
+);
+
+export async function getOpenAITokenCount(
+  prompt: string | OpenAIChatMessage[],
+  model: string
+) {
+  if (typeof prompt === "string") {
+    return getTextTokenCount(prompt);
+  }
+
+  const oldFormatting = model.startsWith("turbo-0301");
+  const vision = model.includes("vision");
+
+  const tokensPerMessage = oldFormatting ? 4 : 3;
+  const tokensPerName = oldFormatting ? -1 : 1; // older formatting replaces role with name if name is present
+
+  let numTokens = vision ? GPT4_VISION_SYSTEM_PROMPT_SIZE : 0;
+
+  for (const message of prompt) {
+    numTokens += tokensPerMessage;
+    for (const key of Object.keys(message)) {
+      {
+        let textContent: string = "";
+        const value = message[key as keyof OpenAIChatMessage];
+
+        if (!value) continue;
+
+        if (Array.isArray(value)) {
+          for (const item of value) {
+            if (item.type === "text") {
+              textContent += item.text;
+            } else if (["image", "image_url"].includes(item.type)) {
+              const { url, detail } = item.image_url;
+              const cost = await getGpt4VisionTokenCost(url, detail);
+              numTokens += cost ?? 0;
+            }
+          }
+        } else {
+          textContent = value;
+        }
+
+        if (textContent.length > 800000 || numTokens > 200000) {
+          throw new Error("Content is too large to tokenize.");
+        }
+
+        numTokens += encoder.encode(textContent).length;
+        if (key === "name") {
+          numTokens += tokensPerName;
+        }
+      }
+    }
+  }
+  numTokens += 3; // every reply is primed with <|start|>assistant<|message|>
+  return { tokenizer: "tiktoken", token_count: numTokens };
+}
+
+async function getGpt4VisionTokenCost(
+  url: string,
+  detail: "auto" | "low" | "high" = "auto"
+) {
+  // For now we do not allow remote images as the proxy would have to download
+  // them, which is a potential DoS vector.
+  if (!url.startsWith("data:image/")) {
+    throw new Error(
+      "Remote images are not supported. Add the image to your prompt as a base64 data URL."
+    );
+  }
+
+  const base64Data = url.split(",")[1];
+  const buffer = Buffer.from(base64Data, "base64");
+  const image = libSharp(buffer);
+  const metadata = await image.metadata();
+
+  if (!metadata || !metadata.width || !metadata.height) {
+    throw new Error("Prompt includes an image that could not be parsed");
+  }
+
+  const { width, height } = metadata;
+
+  let selectedDetail: "low" | "high";
+  if (detail === "auto") {
+    const threshold = 512 * 512;
+    const imageSize = width * height;
+    selectedDetail = imageSize > threshold ? "high" : "low";
+  } else {
+    selectedDetail = detail;
+  }
+
+  // https://platform.openai.com/docs/guides/vision/calculating-costs
+  if (selectedDetail === "low") {
+    log.info(
+      { width, height, tokens: 85 },
+      "Using fixed GPT-4-Vision token cost for low detail image"
+    );
+    return 85;
+  }
+
+  let newWidth = width;
+  let newHeight = height;
+  if (width > 2048 || height > 2048) {
+    const aspectRatio = width / height;
+    if (width > height) {
+      newWidth = 2048;
+      newHeight = Math.round(2048 / aspectRatio);
+    } else {
+      newHeight = 2048;
+      newWidth = Math.round(2048 * aspectRatio);
+    }
+  }
+
+  if (newWidth < newHeight) {
+    newHeight = Math.round((newHeight / newWidth) * 768);
+    newWidth = 768;
+  } else {
+    newWidth = Math.round((newWidth / newHeight) * 768);
+    newHeight = 768;
+  }
+
+  const tiles = Math.ceil(newWidth / 512) * Math.ceil(newHeight / 512);
+  const tokens = 170 * tiles + 85;
+
+  log.info(
+    { width, height, newWidth, newHeight, tiles, tokens },
+    "Calculated GPT-4-Vision token cost for high detail image"
+  );
+  return tokens;
+}
+
+export function getTextTokenCount(prompt: string) {
+  if (prompt.length > 500000) {
+    return {
+      tokenizer: "length fallback",
+      token_count: 100000,
+    };
+  }
+
+  return {
+    tokenizer: "tiktoken",
+    token_count: encoder.encode(prompt).length,
+  };
+}

src/shared/custom.d.ts

@@ -1,8 +1,10 @@
+// noinspection JSUnusedGlobalSymbols,ES6UnusedImports
+
 import type { HttpRequest } from "@smithy/types";
 import { Express } from "express-serve-static-core";
-import { APIFormat, Key, LLMService } from "../shared/key-management";
+import { APIFormat, Key } from "./key-management";
-import { User } from "../shared/users/schema";
+import { User } from "./users/schema";
-import { ModelFamily } from "../shared/models";
+import { LLMService, ModelFamily } from "./models";
 
 declare global {
   namespace Express {
@@ -39,5 +41,6 @@ declare module "express-session" {
     userToken?: string;
     csrf?: string;
     flash?: { type: string; message: string };
+    unlocked?: boolean;
   }
 }

src/shared/errors.ts

@@ -1,15 +1,22 @@
 export class HttpError extends Error {
   constructor(public status: number, message: string) {
     super(message);
+    this.name = "HttpError";
   }
 }
 
-export class UserInputError extends HttpError {
+export class BadRequestError extends HttpError {
   constructor(message: string) {
     super(400, message);
   }
 }
 
+export class PaymentRequiredError extends HttpError {
+  constructor(message: string) {
+    super(402, message);
+  }
+}
+
 export class ForbiddenError extends HttpError {
   constructor(message: string) {
     super(403, message);
@@ -21,3 +28,9 @@ export class NotFoundError extends HttpError {
     super(404, message);
   }
 }
+
+export class TooManyRequestsError extends HttpError {
+  constructor(message: string) {
+    super(429, message);
+  }
+}

src/shared/file-storage/image-history.ts

@@ -1,15 +1,23 @@
-const IMAGE_HISTORY_SIZE = 30;
+const IMAGE_HISTORY_SIZE = 10000;
 const imageHistory = new Array<ImageHistory>(IMAGE_HISTORY_SIZE);
 let index = 0;
 
-type ImageHistory = { url: string; prompt: string };
+type ImageHistory = {
+  url: string;
+  prompt: string;
+  inputPrompt: string;
+  token?: string;
+};
 
 export function addToImageHistory(image: ImageHistory) {
+  if (image.token?.length) {
+    image.token = `...${image.token.slice(-5)}`;
+  }
   imageHistory[index] = image;
   index = (index + 1) % IMAGE_HISTORY_SIZE;
 }
 
-export function getLastNImages(n: number) {
+export function getLastNImages(n: number = IMAGE_HISTORY_SIZE): ImageHistory[] {
   const result: ImageHistory[] = [];
   let currentIndex = (index - 1 + IMAGE_HISTORY_SIZE) % IMAGE_HISTORY_SIZE;
 

src/shared/file-storage/mirror-generated-image.ts

@@ -1,4 +1,5 @@
 import axios from "axios";
+import express from "express";
 import { promises as fs } from "fs";
 import path from "path";
 import { v4 } from "uuid";
@@ -6,7 +7,6 @@ import { USER_ASSETS_DIR } from "../../config";
 import { addToImageHistory } from "./image-history";
 import { libSharp } from "./index";
 
-
 export type OpenAIImageGenerationResult = {
   created: number;
   data: {
@@ -54,10 +54,11 @@ async function createThumbnail(filepath: string) {
  * Mutates the result object.
  */
 export async function mirrorGeneratedImage(
-  host: string,
+  req: express.Request,
   prompt: string,
   result: OpenAIImageGenerationResult
 ): Promise<OpenAIImageGenerationResult> {
+  const host = req.protocol + "://" + req.get("host");
   for (const item of result.data) {
     let mirror: string;
     if (item.b64_json) {
@@ -67,7 +68,11 @@ export async function mirrorGeneratedImage(
     }
     item.url = `${host}/user_content/${path.basename(mirror)}`;
     await createThumbnail(mirror);
-    addToImageHistory({ url: item.url, prompt });
+    addToImageHistory({
+      url: item.url,
+      prompt,
+      inputPrompt: req.body.prompt,
+      token: req.user?.token});
   }
   return result;
 }