Project Browsers 1.0

lib/centrifugo.js

@@ -0,0 +1,52 @@
+const crypto = require('crypto');
+const http = require('http');
+
+const HMAC_SECRET = 'f6aeeb774a009d7b2a2bea348ea23c5f82de55ca38f3f3a2263ecc3cca1314b1';
+const API_KEY = 'f176d279faef1256d209d921e85cd5e27c19ec3b6f057c6829c9ccb18be9af85';
+const CENTRIFUGO_PORT = 8787;
+const CHANNEL = 'projects-browser';
+
+function createJWT(sub, expSeconds = 86400) {
+  const header = { alg: 'HS256', typ: 'JWT' };
+  const payload = { sub, exp: Math.floor(Date.now() / 1000) + expSeconds };
+  const b64 = (obj) => Buffer.from(JSON.stringify(obj)).toString('base64url');
+  const h = b64(header);
+  const p = b64(payload);
+  const sig = crypto.createHmac('sha256', HMAC_SECRET).update(`${h}.${p}`).digest('base64url');
+  return `${h}.${p}.${sig}`;
+}
+
+function publish(data) {
+  const body = JSON.stringify({ method: 'publish', params: { channel: CHANNEL, data } });
+
+  const req = http.request({
+    hostname: '127.0.0.1',
+    port: CENTRIFUGO_PORT,
+    path: '/api',
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'Authorization': `apikey ${API_KEY}`,
+    },
+  }, (res) => {
+    // drain response
+    res.resume();
+  });
+
+  req.on('error', (err) => {
+    console.error('Centrifugo publish error:', err.message);
+  });
+
+  req.write(body);
+  req.end();
+}
+
+function publishStatus(slug, status, extra = {}) {
+  publish({ type: 'status', slug, status, ...extra });
+}
+
+function publishScreenshot(slug) {
+  publish({ type: 'screenshot', slug, url: `/screenshots/${slug}.png?t=${Date.now()}` });
+}
+
+module.exports = { createJWT, publish, publishStatus, publishScreenshot, CHANNEL };