api: move itunnel handlers to separate file

api/src/core/api.js

@@ -8,18 +8,19 @@ import jwt from "../security/jwt.js";
 import stream from "../stream/stream.js";
 import match from "../processing/match.js";
 
-import { env, isCluster, setTunnelPort } from "../config.js";
+import { env } from "../config.js";
 import { extract } from "../processing/url.js";
-import { Green, Bright, Cyan } from "../misc/console-text.js";
+import { Bright, Cyan } from "../misc/console-text.js";
 import { hashHmac } from "../security/secrets.js";
 import { createStore } from "../store/redis-ratelimit.js";
 import { randomizeCiphers } from "../misc/randomize-ciphers.js";
 import { verifyTurnstileToken } from "../security/turnstile.js";
 import { friendlyServiceName } from "../processing/service-alias.js";
-import { verifyStream, getInternalTunnel } from "../stream/manage.js";
+import { verifyStream } from "../stream/manage.js";
 import { createResponse, normalizeRequest, getIP } from "../processing/request.js";
 import * as APIKeys from "../security/api-keys.js";
 import * as Cookies from "../processing/cookie/manager.js";
+import { setupTunnelHandler } from "./itunnel.js";
 
 const git = {
     branch: await getBranch(),
@@ -292,29 +293,7 @@ export const runAPI = async (express, app, __dirname, isPrimary = true) => {
         }
 
         return stream(res, streamInfo);
-    })
+    });
-
-    const itunnelHandler = (req, res) => {
-        if (!req.ip.endsWith('127.0.0.1')) {
-            return res.sendStatus(403);
-        }
-
-        if (String(req.query.id).length !== 21) {
-            return res.sendStatus(400);
-        }
-
-        const streamInfo = getInternalTunnel(req.query.id);
-        if (!streamInfo) {
-            return res.sendStatus(404);
-        }
-
-        streamInfo.headers = new Map([
-            ...(streamInfo.headers || []),
-            ...Object.entries(req.headers)
-        ]);
-
-        return stream(res, { type: 'internal', ...streamInfo });
-    };
 
     app.get('/', (_, res) => {
         res.type('json');
@@ -376,15 +355,5 @@ export const runAPI = async (express, app, __dirname, isPrimary = true) => {
         }
     });
 
-    const istreamer = express();
+    setupTunnelHandler();
-    istreamer.get('/itunnel', itunnelHandler);
-    const server = istreamer.listen({
-        port: 0,
-        host: '127.0.0.1',
-        exclusive: true
-    }, () => {
-        const { port } = server.address();
-        console.log(`${Green('[✓]')} cobalt sub-instance running on 127.0.0.1:${port}`);
-        setTunnelPort(port);
-    });
 }

api/src/core/itunnel.js

@@ -0,0 +1,61 @@
+import stream from "../stream/stream.js";
+import { getInternalTunnel } from "../stream/manage.js";
+import { setTunnelPort } from "../config.js";
+import { Green } from "../misc/console-text.js";
+import express from "express";
+
+const validateTunnel = (req, res) => {
+    if (!req.ip.endsWith('127.0.0.1')) {
+        res.sendStatus(403);
+        return;
+    }
+
+    if (String(req.query.id).length !== 21) {
+        res.sendStatus(400);
+        return;
+    }
+
+    const streamInfo = getInternalTunnel(req.query.id);
+    if (!streamInfo) {
+        res.sendStatus(404);
+        return;
+    }
+
+    return streamInfo;
+}
+
+const streamTunnel = (req, res) => {
+    const streamInfo = validateTunnel(req, res);
+    if (!streamInfo) {
+        return;
+    }
+
+    streamInfo.headers = new Map([
+        ...(streamInfo.headers || []),
+        ...Object.entries(req.headers)
+    ]);
+
+    return stream(res, { type: 'internal', ...streamInfo });
+}
+
+export const setupTunnelHandler = () => {
+    const tunnelHandler = express();
+
+    tunnelHandler.get('/itunnel', streamTunnel);
+
+    // fallback
+    tunnelHandler.use((_, res) => res.sendStatus(400));
+    // error handler
+    tunnelHandler.use((_, __, res, ____) => res.socket.end());
+
+
+    const server = tunnelHandler.listen({
+        port: 0,
+        host: '127.0.0.1',
+        exclusive: true
+    }, () => {
+        const { port } = server.address();
+        console.log(`${Green('[✓]')} internal tunnel handler running on 127.0.0.1:${port}`);
+        setTunnelPort(port);
+    });
+}