mirror of
https://github.com/denuitt1/mhr-cfw.git
synced 2026-05-17 21:24:36 +03:00
Mohammad Amin jahani
144 lines
4.0 KiB
JavaScript
144 lines
4.0 KiB
JavaScript
// Upstream Forwarder — single-file Node 18+ HTTP server.
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//
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// Purpose: Provide a stable exit IP for the Cloudflare Worker relay so
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// CAPTCHA tokens (Turnstile, reCAPTCHA, hCaptcha) bound to the solving
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// IP survive verification on the target site.
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//
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// Run on a VPS with a stable public IP. Expose behind Caddy/nginx with
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// TLS — the Worker rejects non-HTTPS forwarder URLs.
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//
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// Required env:
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// AUTH_KEY — must match the Worker's UPSTREAM_AUTH_KEY (>= 32 chars)
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//
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// Optional env:
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// PORT — listen port (default 8787)
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// HOST — listen host (default 127.0.0.1, so Caddy/nginx fronts it)
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//
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// Wire protocol matches main/script/worker.js:
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// POST /fwd body: { u, m, h, b, ct, r } → { s, h, b } or { e }
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"use strict";
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const http = require("http");
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const AUTH_KEY = process.env.AUTH_KEY || "";
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const PORT = parseInt(process.env.PORT, 10) || 8787;
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const HOST = process.env.HOST || "127.0.0.1";
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if (!AUTH_KEY || AUTH_KEY.length < 32) {
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console.error("FATAL: AUTH_KEY env var missing or shorter than 32 chars.");
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process.exit(1);
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}
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// Mirrors SKIP_HEADERS in main/script/Code.gs:6-9.
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const SKIP_HEADERS = new Set([
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"host",
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"connection",
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"content-length",
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"transfer-encoding",
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"proxy-connection",
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"proxy-authorization"
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]);
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const STATUS_PAGE =
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"<!DOCTYPE html><html><head><title>Forwarder Active</title></head>" +
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'<body style="font-family:sans-serif;max-width:600px;margin:40px auto">' +
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'<h1>Forwarder <span style="color:#16a34a;font-weight:700">Active</span></h1>' +
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"<p>Upstream forwarder for the relay Worker.</p>" +
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"</body></html>";
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const server = http.createServer(async (req, res) => {
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try {
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if (req.method === "GET" && (req.url === "/" || req.url === "")) {
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res.writeHead(200, { "content-type": "text/html; charset=utf-8" });
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res.end(STATUS_PAGE);
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return;
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}
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if (req.method !== "POST" || req.url !== "/fwd") {
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sendJson(res, 404, { e: "not found" });
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return;
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}
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if (req.headers["x-upstream-auth"] !== AUTH_KEY) {
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sendJson(res, 401, { e: "unauthorized" });
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return;
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}
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const raw = await readBody(req);
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let body;
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try {
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body = JSON.parse(raw);
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} catch (_) {
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sendJson(res, 400, { e: "invalid json" });
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return;
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}
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if (!body.u || typeof body.u !== "string" || !/^https?:\/\//i.test(body.u)) {
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sendJson(res, 400, { e: "bad url" });
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return;
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}
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const headers = {};
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if (body.h && typeof body.h === "object") {
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for (const [k, v] of Object.entries(body.h)) {
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if (typeof v !== "string") continue;
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if (SKIP_HEADERS.has(k.toLowerCase())) continue;
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headers[k] = v;
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}
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}
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headers["x-fwd-hop"] = "1";
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const fetchOptions = {
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method: (body.m || "GET").toUpperCase(),
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headers,
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redirect: body.r === false ? "manual" : "follow"
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};
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if (body.b) {
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fetchOptions.body = Buffer.from(body.b, "base64");
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}
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let resp;
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try {
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resp = await fetch(body.u, fetchOptions);
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} catch (err) {
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sendJson(res, 502, { e: "fetch failed: " + String(err && err.message || err) });
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return;
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}
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const buf = Buffer.from(await resp.arrayBuffer());
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const responseHeaders = {};
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resp.headers.forEach((v, k) => {
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responseHeaders[k] = v;
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});
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sendJson(res, 200, {
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s: resp.status,
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h: responseHeaders,
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b: buf.toString("base64")
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});
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} catch (err) {
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sendJson(res, 500, { e: String(err && err.message || err) });
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}
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});
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server.listen(PORT, HOST, () => {
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console.log("upstream_forwarder listening on " + HOST + ":" + PORT);
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});
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function readBody(req) {
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return new Promise((resolve, reject) => {
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const chunks = [];
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req.on("data", c => chunks.push(c));
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req.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")));
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req.on("error", reject);
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});
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}
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function sendJson(res, status, obj) {
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const body = JSON.stringify(obj);
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res.writeHead(status, { "content-type": "application/json" });
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res.end(body);
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}
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