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Default 8443.\n// HOST — bind address. Default 0.0.0.0 (all interfaces).\n// CERT_FILE — path to TLS cert PEM. Omit for plain HTTP (use a reverse\n// proxy like Caddy / nginx / Cloudflare Tunnel for TLS).\n// KEY_FILE — path to TLS key PEM (must be set together with CERT_FILE).\n//\n// Behind a reverse proxy (Caddy, nginx, Cloudflare Tunnel) you typically\n// run this on plain HTTP and let the proxy terminate TLS — that's the\n// simpler setup if you already have a domain. Set PORT=8443 and point\n// your reverse proxy at http://localhost:8443.\n//\n// Standalone TLS (rare but supported): set CERT_FILE + KEY_FILE to\n// matching PEM-encoded files and Deno will terminate TLS itself. Use\n// Let's Encrypt's certbot / acme.sh to fetch a real cert; self-signed\n// will not work (Apps Script's UrlFetchApp validates the chain).\n//\n// EDIT exit_node.ts FIRST: replace the placeholder PSK with a strong\n// secret. The wrapper imports the handler from exit_node.ts directly,\n// so changing the constant in exit_node.ts is all you need.\n\nimport exitNode from \"./exit_node.ts\";\n\nconst handler = typeof exitNode === \"function\"\n ? exitNode\n : exitNode.fetch.bind(exitNode);\n\nfunction concatChunks(chunks: Uint8Array[]): Blob | undefined {\n if (!chunks.length) return undefined;\n const len = chunks.reduce((sum, chunk) => sum + chunk.length, 0);\n const out = new Uint8Array(len);\n let offset = 0;\n for (const chunk of chunks) {\n out.set(chunk, offset);\n offset += chunk.length;\n }\n return new Blob([out.buffer as ArrayBuffer]);\n}\n\n// Deno (preferred)\nif (typeof (globalThis as any).Deno !== \"undefined\") {\n const Deno = (globalThis as any).Deno;\n const port = Number(Deno.env.get(\"PORT\") ?? 8443);\n const hostname = Deno.env.get(\"HOST\") ?? \"0.0.0.0\";\n const certFile = Deno.env.get(\"CERT_FILE\");\n const keyFile = Deno.env.get(\"KEY_FILE\");\n\n if (certFile && keyFile) {\n Deno.serve(\n {\n port,\n hostname,\n cert: Deno.readTextFileSync(certFile),\n key: Deno.readTextFileSync(keyFile),\n },\n handler,\n );\n console.log(`exit_node listening on https://${hostname}:${port}`);\n } else {\n Deno.serve({ port, hostname }, handler);\n console.log(\n `exit_node listening on http://${hostname}:${port} ` +\n `(no TLS — terminate it with a reverse proxy like Caddy/nginx)`,\n );\n }\n} // Bun\nelse if (typeof (globalThis as any).Bun !== \"undefined\") {\n const Bun = (globalThis as any).Bun;\n const port = Number(process.env.PORT ?? 8443);\n const hostname = process.env.HOST ?? \"0.0.0.0\";\n\n Bun.serve({\n port,\n hostname,\n fetch: handler,\n tls: process.env.CERT_FILE && process.env.KEY_FILE\n ? {\n cert: Bun.file(process.env.CERT_FILE),\n key: Bun.file(process.env.KEY_FILE),\n }\n : undefined,\n });\n console.log(`exit_node listening on ${hostname}:${port}`);\n} // Node 22+ — uses the built-in `node:http` module + globalThis.Request/Response\nelse if (typeof (globalThis as any).process !== \"undefined\") {\n const { createServer } = await import(\"node:http\");\n const port = Number(process.env.PORT ?? 8443);\n const hostname = process.env.HOST ?? \"0.0.0.0\";\n\n createServer(async (req, res) => {\n // Build a web-standard Request from Node's IncomingMessage.\n const chunks: Uint8Array[] = [];\n for await (const c of req) chunks.push(c as Uint8Array);\n const body = concatChunks(chunks);\n\n const url = `http://${req.headers.host ?? hostname}${req.url ?? \"/\"}`;\n const webReq = new Request(url, {\n method: req.method,\n headers: req.headers as Record,\n body,\n });\n\n const webRes = await handler(webReq);\n\n res.statusCode = webRes.status;\n webRes.headers.forEach((v: string, k: string) => res.setHeader(k, v));\n const buf = new Uint8Array(await webRes.arrayBuffer());\n res.end(buf);\n }).listen(port, hostname, () => {\n console.log(`exit_node listening on http://${hostname}:${port}`);\n });\n} else {\n throw new Error(\n \"No supported runtime detected. Run this file with Deno, Bun, or Node 22+.\",\n );\n}","deleted",false,"label",[36],"37a4676a-539d-11f1-b32c-ee650bb23af1","exit_node.ts","68bff842-539c-11f1-90ec-ee650bb23af1",9,["D",1779207013341],3,"// mhrv-rs exit node — deploy as an HTTP endpoint on any serverless\n// TypeScript host with a public IP that isn't a Google datacenter\n// (Deno Deploy, fly.io, your own VPS, etc.). Uses only web-standard\n// `Request` / `Response` / `fetch` so it's portable across runtimes.\n//\n// Purpose: chain client → Apps Script → this exit node → destination.\n// Apps Script's UrlFetchApp can't reach Cloudflare-protected sites that\n// flag Google datacenter IPs as bots (chatgpt.com, claude.ai, grok.com,\n// many other CF-fronted SaaS). This exit node sits between Apps Script\n// and the destination; the destination sees the exit node's outbound IP\n// (generally not flagged as Google datacenter) and accepts the request.\n//\n// Setup:\n// 1. Pick a host that runs web-standard fetch handlers (e.g. Deno\n// Deploy, fly.io with a thin server wrapper, or any cheap VPS\n// running Deno / Node + this script as a handler).\n// 2. Paste the contents of this file as the request handler.\n// 3. Set PSK below to a strong secret (`openssl rand -hex 32` from\n// a terminal — DO NOT leave the placeholder in production).\n// 4. Deploy and copy the public URL of the deployed handler.\n// 5. In mhrv-rs config.json, add:\n// \"exit_node\": {\n// \"enabled\": true,\n// \"relay_url\": \"https://your-deployed-exit-node.example.com\",\n// \"psk\": \"\",\n// \"mode\": \"selective\",\n// \"hosts\": [\"chatgpt.com\", \"claude.ai\", \"x.com\", \"grok.com\"]\n// }\n//\n// Threat model: PSK is the only thing keeping this from being an open\n// proxy on the public internet. Treat it like a password: do not commit\n// to source control, do not share publicly, rotate if leaked. The exit\n// node refuses all requests that don't carry the matching PSK.\n//\n// Failure mode: if the exit node is unreachable, mhrv-rs falls back to\n// the regular Apps Script relay automatically — the only consequence\n// of an offline exit node is that ChatGPT/Claude/Grok stop working;\n// other sites are unaffected.\n\nconst PSK = \"CHANGE_ME_TO_A_STRONG_SECRET\";\n\n// Headers the client may send that must NOT be forwarded to the\n// destination — they're hop-by-hop or would break re-encoding.\nconst STRIP_HEADERS = new Set([\n \"host\",\n \"connection\",\n \"content-length\",\n \"transfer-encoding\",\n \"proxy-connection\",\n \"proxy-authorization\",\n \"x-forwarded-for\",\n \"x-forwarded-host\",\n \"x-forwarded-proto\",\n \"x-forwarded-port\",\n \"x-real-ip\",\n \"forwarded\",\n \"via\",\n]);\n\nfunction decodeBase64ToBytes(input: string): Uint8Array {\n const bin = atob(input);\n const out = new Uint8Array(bin.length);\n for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);\n return out;\n}\n\nfunction encodeBytesToBase64(bytes: Uint8Array): string {\n let bin = \"\";\n for (let i = 0; i < bytes.length; i++) bin += String.fromCharCode(bytes[i]);\n return btoa(bin);\n}\n\nfunction sanitizeHeaders(h: unknown): Record {\n const out: Record = {};\n if (!h || typeof h !== \"object\") return out;\n for (const [k, v] of Object.entries(h as Record)) {\n if (!k) continue;\n if (STRIP_HEADERS.has(k.toLowerCase())) continue;\n out[k] = String(v ?? \"\");\n }\n return out;\n}\n\nexport async function handleExitNodeRequest(req: Request): Promise {\n // Fail closed on the placeholder PSK so a fresh deploy without setup\n // can't accidentally serve as an open relay.\n if (PSK === \"CHANGE_ME_TO_A_STRONG_SECRET\") {\n return Response.json(\n {\n e: \"exit_node misconfigured: PSK is still the placeholder. Set \" +\n \"a strong secret in the source before deploying.\",\n },\n { status: 503 },\n );\n }\n\n try {\n if (req.method !== \"POST\") {\n return Response.json({ e: \"method_not_allowed\" }, { status: 405 });\n }\n\n const body = await req.json();\n if (!body || typeof body !== \"object\") {\n return Response.json({ e: \"bad_json\" }, { status: 400 });\n }\n\n const k = String((body as any).k ?? \"\");\n const u = String((body as any).u ?? \"\");\n const m = String((body as any).m ?? \"GET\").toUpperCase();\n const h = sanitizeHeaders((body as any).h);\n const b64 = (body as any).b;\n\n if (k !== PSK) {\n return Response.json({ e: \"unauthorized\" }, { status: 401 });\n }\n if (!/^https?:\\/\\//i.test(u)) {\n return Response.json({ e: \"bad url\" }, { status: 400 });\n }\n\n // Loop guard: if u points at this exit node's own host, refuse.\n // Without this, a misconfigured client could chain exit-node →\n // exit-node → exit-node → ... and burn the host's runtime budget.\n try {\n const reqUrl = new URL(req.url);\n const dstUrl = new URL(u);\n if (\n reqUrl.host === dstUrl.host &&\n reqUrl.protocol === dstUrl.protocol\n ) {\n return Response.json({ e: \"exit-node loop refused\" }, { status: 400 });\n }\n } catch {\n // Malformed URL — let the fetch below 400.\n }\n\n let payload: Uint8Array | undefined;\n if (typeof b64 === \"string\" && b64.length > 0) {\n payload = decodeBase64ToBytes(b64);\n }\n\n const resp = await fetch(u, {\n method: m,\n headers: h,\n body: payload,\n redirect: \"manual\",\n });\n\n // `fetch()` (Deno / Bun / Node) auto-decompresses gzip / br / deflate\n // responses, so `resp.arrayBuffer()` returns plain bytes — but the\n // destination's `Content-Encoding` header is still on `resp.headers`.\n // Forwarding it would tell the client browser \"this body is gzipped\"\n // when it isn't, producing `Content Encoding Error` (#964). Same goes\n // for `Content-Length` — the post-decompression byte count is\n // different from what the destination announced. Strip both. The\n // Apps Script + Rust transport layer below us re-frames the wire body\n // anyway, so neither header is meaningful to forward.\n const data = new Uint8Array(await resp.arrayBuffer());\n const respHeaders: Record = {};\n resp.headers.forEach((value, key) => {\n const lower = key.toLowerCase();\n if (lower === \"content-encoding\" || lower === \"content-length\") return;\n respHeaders[key] = value;\n });\n\n return Response.json({\n s: resp.status,\n h: respHeaders,\n b: encodeBytesToBase64(data),\n });\n } catch (err) {\n const message = err instanceof Error ? err.message : String(err);\n return Response.json({ e: message }, { status: 500 });\n }\n}\n\nexport default {\n fetch: 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