Runner: Geruest, Eingabepruefung, Auth

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

runner/src/server.js

@@ -0,0 +1,87 @@
+import http from 'node:http';
+import crypto from 'node:crypto';
+import { readFileSync } from 'node:fs';
+import { validateJob, isValidSub } from './validate.js';
+
+const MAX_BODY = 256 * 1024;
+
+export function readMemAvailable(path = '/proc/meminfo') {
+  const m = /^MemAvailable:\s+(\d+)\s+kB/m.exec(readFileSync(path, 'utf8'));
+  return m ? Number(m[1]) * 1024 : 0;
+}
+
+function tokenOk(header, token) {
+  if (!token) return false;
+  const m = /^Bearer (.+)$/.exec(header || '');
+  if (!m) return false;
+  const a = crypto.createHash('sha256').update(m[1]).digest();
+  const b = crypto.createHash('sha256').update(token).digest();
+  return crypto.timingSafeEqual(a, b);
+}
+
+function send(res, status, obj) {
+  const body = JSON.stringify(obj);
+  res.writeHead(status, { 'Content-Type': 'application/json', 'Content-Length': Buffer.byteLength(body) });
+  res.end(body);
+}
+
+function readJson(req) {
+  return new Promise((resolve, reject) => {
+    const chunks = [];
+    let size = 0;
+    let tooBig = false;
+    req.on('data', (c) => {
+      if (tooBig) return; // Rest verwerfen, damit die Antwort noch ausgeliefert wird
+      size += c.length;
+      if (size > MAX_BODY) { tooBig = true; chunks.length = 0; return; }
+      chunks.push(c);
+    });
+    req.on('end', () => {
+      if (tooBig) return reject(Object.assign(new Error('Anfrage zu groß'), { status: 413 }));
+      const raw = Buffer.concat(chunks).toString('utf8');
+      if (!raw) return resolve({});
+      try { resolve(JSON.parse(raw)); } catch { reject(Object.assign(new Error('Ungültiges JSON'), { status: 400 })); }
+    });
+    req.on('error', reject);
+  });
+}
+
+export function createApiServer({ config, jobs, dev, mem = readMemAvailable }) {
+  return http.createServer(async (req, res) => {
+    try {
+      if (!tokenOk(req.headers.authorization, config.token)) return send(res, 401, { error: 'Nicht autorisiert' });
+      const url = new URL(req.url, 'http://x');
+      const parts = url.pathname.split('/').filter(Boolean);
+      const method = req.method;
+
+      if (method === 'GET' && url.pathname === '/status') {
+        return send(res, 200, { dev: dev.list(), queue: jobs.queueLength(), memAvailable: mem() });
+      }
+      if (method === 'POST' && url.pathname === '/jobs/build') {
+        const v = validateJob(await readJson(req));
+        if (!v.ok) return send(res, 400, { error: v.error });
+        return send(res, 200, jobs.submit(v.job));
+      }
+      if (method === 'GET' && parts[0] === 'jobs' && parts.length === 2) {
+        const run = jobs.get(parts[1]);
+        return run ? send(res, 200, run) : send(res, 404, { error: 'Lauf nicht gefunden' });
+      }
+      if (method === 'POST' && parts[0] === 'dev' && parts.length === 3 && ['start', 'stop'].includes(parts[2])) {
+        const sub = parts[1];
+        if (!isValidSub(sub)) return send(res, 400, { error: 'Ungültige Subdomain' });
+        if (parts[2] === 'stop') {
+          await dev.stop(sub);
+          return send(res, 200, { ok: true });
+        }
+        const v = validateJob(await readJson(req));
+        if (!v.ok) return send(res, 400, { error: v.error });
+        if (v.job.sub !== sub) return send(res, 400, { error: 'Subdomain stimmt nicht überein' });
+        return send(res, 200, await dev.ensure(sub, v.job));
+      }
+      return send(res, 404, { error: 'Nicht gefunden' });
+    } catch (e) {
+      const status = e.status || 500;
+      if (!res.headersSent) send(res, status, { error: status === 500 ? 'Interner Fehler' : e.message });
+    }
+  });
+}