khanon
78 lines
2.0 KiB
TypeScript
78 lines
2.0 KiB
TypeScript
import { RequestHandler, Router } from "express";
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import { config } from "../config";
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import { generateModelList } from "./openai";
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import { ipLimiter } from "./rate-limit";
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import {
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addAzureKey,
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createPreprocessorMiddleware,
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finalizeSignedRequest,
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} from "./middleware/request";
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import { ProxyResHandlerWithBody } from "./middleware/response";
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import { createQueuedProxyMiddleware } from "./middleware/request/proxy-middleware-factory";
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let modelsCache: any = null;
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let modelsCacheTime = 0;
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const handleModelRequest: RequestHandler = (_req, res) => {
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if (new Date().getTime() - modelsCacheTime < 1000 * 60) {
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return res.status(200).json(modelsCache);
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}
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if (!config.azureCredentials) return { object: "list", data: [] };
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const result = generateModelList("azure");
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modelsCache = { object: "list", data: result };
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modelsCacheTime = new Date().getTime();
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res.status(200).json(modelsCache);
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};
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const azureOpenaiResponseHandler: ProxyResHandlerWithBody = async (
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_proxyRes,
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req,
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res,
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body
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) => {
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if (typeof body !== "object") {
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throw new Error("Expected body to be an object");
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}
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res.status(200).json({ ...body, proxy: body.proxy });
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};
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const azureOpenAIProxy = createQueuedProxyMiddleware({
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target: ({ signedRequest }) => {
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if (!signedRequest) throw new Error("Must sign request before proxying");
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const { hostname, path } = signedRequest;
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return `https://${hostname}${path}`;
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},
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mutations: [addAzureKey, finalizeSignedRequest],
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blockingResponseHandler: azureOpenaiResponseHandler,
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});
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const azureOpenAIRouter = Router();
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azureOpenAIRouter.get("/v1/models", handleModelRequest);
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azureOpenAIRouter.post(
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"/v1/chat/completions",
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ipLimiter,
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createPreprocessorMiddleware({
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inApi: "openai",
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outApi: "openai",
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service: "azure",
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}),
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azureOpenAIProxy
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);
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azureOpenAIRouter.post(
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"/v1/images/generations",
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ipLimiter,
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createPreprocessorMiddleware({
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inApi: "openai-image",
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outApi: "openai-image",
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service: "azure",
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}),
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azureOpenAIProxy
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);
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export const azure = azureOpenAIRouter;
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