feat: Add new provider OpenRouter

.env.template

@@ -81,3 +81,9 @@ SILICONFLOW_API_KEY=
 
 ### siliconflow Api url (optional)
 SILICONFLOW_URL=
+
+### openrouter Api key (optional)
+OPENROUTER_API_KEY=
+
+### openrouter Api url (optional)
+OPENROUTER_URL=

app/api/[provider]/[...path]/route.ts

@@ -14,6 +14,7 @@ import { handle as deepseekHandler } from "../../deepseek";
 import { handle as siliconflowHandler } from "../../siliconflow";
 import { handle as xaiHandler } from "../../xai";
 import { handle as chatglmHandler } from "../../glm";
+import { handle as openrouterHandler } from "../../openrouter";
 import { handle as proxyHandler } from "../../proxy";
 
 async function handle(
@@ -50,6 +51,8 @@ async function handle(
       return chatglmHandler(req, { params });
     case ApiPath.SiliconFlow:
       return siliconflowHandler(req, { params });
+    case ApiPath.OpenRouter:
+      return openrouterHandler(req, { params });
     case ApiPath.OpenAI:
       return openaiHandler(req, { params });
     default:

app/api/auth.ts

@@ -104,6 +104,9 @@ export function auth(req: NextRequest, modelProvider: ModelProvider) {
       case ModelProvider.SiliconFlow:
         systemApiKey = serverConfig.siliconFlowApiKey;
         break;
+      case ModelProvider.OpenRouter:
+        systemApiKey = serverConfig.openrouterApiKey;
+        break;
       case ModelProvider.GPT:
       default:
         if (req.nextUrl.pathname.includes("azure/deployments")) {

app/api/openrouter.ts

@@ -0,0 +1,146 @@
+import { getServerSideConfig } from "@/app/config/server";
+import {
+  OPENROUTER_BASE_URL,
+  OpenRouter,
+  ApiPath,
+  ServiceProvider,
+  ModelProvider,
+} from "@/app/constant";
+import { prettyObject } from "@/app/utils/format";
+import { NextRequest, NextResponse } from "next/server";
+import { auth } from "./auth";
+import { isModelNotavailableInServer } from "@/app/utils/model";
+
+const ALLOWED_PATH = new Set([OpenRouter.ChatPath]);
+
+export async function handle(
+  req: NextRequest,
+  { params }: { params: { path: string[] } },
+) {
+  console.log("[OpenRouter Route] params ", params);
+
+  if (req.method === "OPTIONS") {
+    return NextResponse.json({ body: "OK" }, { status: 200 });
+  }
+
+  const subpath = params.path.join("/");
+
+  if (!ALLOWED_PATH.has(subpath)) {
+    console.log("[OpenRouter Route] forbidden path ", subpath);
+    return NextResponse.json(
+      {
+        error: true,
+        msg: "you are not allowed to request " + subpath,
+      },
+      {
+        status: 403,
+      },
+    );
+  }
+
+  const authResult = auth(req, ModelProvider.OpenRouter);
+  if (authResult.error) {
+    return NextResponse.json(authResult, {
+      status: 401,
+    });
+  }
+
+  try {
+    const response = await request(req);
+    return response;
+  } catch (e) {
+    console.error("[OpenRouter] ", e);
+    return NextResponse.json(prettyObject(e));
+  }
+}
+
+const serverConfig = getServerSideConfig();
+
+async function request(req: NextRequest) {
+  const controller = new AbortController();
+
+  let path = `${req.nextUrl.pathname}`.replaceAll(ApiPath.OpenRouter, "");
+
+  let baseUrl = serverConfig.openrouterUrl || OPENROUTER_BASE_URL;
+
+  if (!baseUrl.startsWith("http")) {
+    baseUrl = `https://${baseUrl}`;
+  }
+
+  if (baseUrl.endsWith("/")) {
+    baseUrl = baseUrl.slice(0, -1);
+  }
+
+  console.log("[Proxy] ", path);
+  console.log("[Base Url]", baseUrl);
+
+  const timeoutId = setTimeout(
+    () => {
+      controller.abort();
+    },
+    10 * 60 * 1000,
+  );
+
+  const fetchUrl = `${baseUrl}${path}`;
+  const fetchOptions: RequestInit = {
+    headers: {
+      "Content-Type": "application/json",
+      Authorization: req.headers.get("Authorization") ?? "",
+    },
+    method: req.method,
+    body: req.body,
+    redirect: "manual",
+    // @ts-ignore
+    duplex: "half",
+    signal: controller.signal,
+  };
+
+  // #1815 try to refuse some request to some models
+  if (serverConfig.customModels && req.body) {
+    try {
+      const clonedBody = await req.text();
+      fetchOptions.body = clonedBody;
+
+      const jsonBody = JSON.parse(clonedBody) as { model?: string };
+
+      // not undefined and is false
+      if (
+        isModelNotavailableInServer(
+          serverConfig.customModels,
+          jsonBody?.model as string,
+          ServiceProvider.OpenRouter as string,
+        )
+      ) {
+        return NextResponse.json(
+          {
+            error: true,
+            message: `you are not allowed to use ${jsonBody?.model} model`,
+          },
+          {
+            status: 403,
+          },
+        );
+      }
+    } catch (e) {
+      console.error(`[OpenRouter] filter`, e);
+    }
+  }
+
+  try {
+    const res = await fetch(fetchUrl, fetchOptions);
+
+    // to prevent browser prompt for credentials
+    const newHeaders = new Headers(res.headers);
+    newHeaders.delete("www-authenticate");
+    // to disable nginx buffering
+    newHeaders.set("X-Accel-Buffering", "no");
+
+    return new Response(res.body, {
+      status: res.status,
+      statusText: res.statusText,
+      headers: newHeaders,
+    });
+  } finally {
+    clearTimeout(timeoutId);
+  }
+}

app/client/api.ts

@@ -24,6 +24,7 @@ import { DeepSeekApi } from "./platforms/deepseek";
 import { XAIApi } from "./platforms/xai";
 import { ChatGLMApi } from "./platforms/glm";
 import { SiliconflowApi } from "./platforms/siliconflow";
+import { OpenRouterApi } from "./platforms/openrouter";
 
 export const ROLES = ["system", "user", "assistant"] as const;
 export type MessageRole = (typeof ROLES)[number];
@@ -173,6 +174,9 @@ export class ClientApi {
       case ModelProvider.SiliconFlow:
         this.llm = new SiliconflowApi();
         break;
+      case ModelProvider.OpenRouter:
+        this.llm = new OpenRouterApi();
+        break;
       default:
         this.llm = new ChatGPTApi();
     }
@@ -382,6 +386,8 @@ export function getClientApi(provider: ServiceProvider): ClientApi {
       return new ClientApi(ModelProvider.ChatGLM);
     case ServiceProvider.SiliconFlow:
       return new ClientApi(ModelProvider.SiliconFlow);
+    case ServiceProvider.OpenRouter:
+      return new ClientApi(ModelProvider.OpenRouter);
     default:
       return new ClientApi(ModelProvider.GPT);
   }