Mobile Proxy for Airtable Automation

// worker.js (deploy on Cloudflare Workers)
export default {
  async fetch(req, env) {
    const auth = req.headers.get('x-relay-key');
    if (auth !== env.RELAY_KEY) return new Response('forbidden', { status: 403 });

    const { url, method = 'GET', headers = {}, body } = await req.json();
    const proxy = `http://${env.PROXY_USER}:${env.PROXY_PASS}@${env.PROXY_HOST}:${env.PROXY_PORT}`;

    // Cloudflare Workers don't ship undici; use the fetch-through-relay
    // sub-pattern: forward to a tiny Node service hosted on Fly/Railway.
    // OR use Workers TCP socket API to speak HTTP CONNECT directly:
    const r = await connectAndFetch({ url, method, headers, body, proxy });

    return new Response(r.body, { status: r.status, headers: r.headers });
  },
};

// connectAndFetch implements: TCP connect → CONNECT host:443 HTTP/1.1
//                              → upgrade to TLS → send request.
// Reference implementation at github.com/mobileproxies/cf-relay (50 lines).

curl -X POST https://relay.your-domain.workers.dev \
  -H "x-relay-key: SHARED_SECRET" \
  -H "content-type: application/json" \
  -d '{"url":"https://api.ipify.org"}'

# Should print a mobile carrier IP (not Cloudflare's IP).

const { recordId, targetUrl } = input.config();

const RELAY = "https://relay.your-domain.workers.dev";
const KEY   = "SHARED_SECRET";

const res = await fetch(RELAY, {
    method: "POST",
    headers: { "content-type": "application/json", "x-relay-key": KEY },
    body: JSON.stringify({ url: targetUrl, method: "GET" }),
});
const body = await res.text();

const table = base.getTable("Targets");
await table.updateRecordAsync(recordId, {
    "Status":     res.status,
    "Response":   body.slice(0, 100000),  // Airtable cell limit
    "FetchedAt":  new Date().toISOString(),
});

const API_KEY = "YOUR_API_KEY";
const SLOT    = "us-mob-01";

const r = await fetch(
    `https://buy.mobileproxies.org/api/v1/proxies/${SLOT}/switch`,
    { method: "POST", headers: { Authorization: `Bearer ${API_KEY}` } },
);
console.log("rotate status:", r.status);