Analytics: Skripte ausliefern

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

analytics/src/assets.js

@@ -0,0 +1,60 @@
+// GET/HEAD /a/w.js und /a/h.js (öffentlicher Listener): generierte Client-Skripte aus client/dist/.
+// Einmal beim Start in den Speicher geladen (roh + gzip); fehlt eine Datei, antwortet der Pfad mit 503.
+import { readFileSync } from 'node:fs';
+import { join, dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { gzipSync } from 'node:zlib';
+import crypto from 'node:crypto';
+
+const DEFAULT_DIR = join(dirname(fileURLToPath(import.meta.url)), '..', 'client', 'dist');
+const FILES = { '/a/w.js': 'w.js', '/a/h.js': 'h.js' };
+
+export function createAssets({ distDir = DEFAULT_DIR, log = console } = {}) {
+  const assets = new Map();
+  for (const [path, file] of Object.entries(FILES)) {
+    try {
+      const raw = readFileSync(join(distDir, file));
+      assets.set(path, { raw, gz: gzipSync(raw, { level: 9 }), etag: `"${crypto.createHash('sha256').update(raw).digest('hex')}"` });
+    } catch (e) {
+      log.error(`Analytics: Skript ${file} fehlt in ${distDir} (${e.code || e.message}); ${path} antwortet mit 503`);
+    }
+  }
+
+  // true, wenn die Anfrage ein Skript betraf.
+  return function handle(req, res, pathname) {
+    if (!(pathname in FILES)) return false;
+    if (req.method !== 'GET' && req.method !== 'HEAD') {
+      res.writeHead(405, { Allow: 'GET, HEAD' });
+      res.end();
+      return true;
+    }
+    const a = assets.get(pathname);
+    if (!a) {
+      res.writeHead(503, { 'Content-Type': 'application/json', 'Cache-Control': 'no-store' });
+      res.end(req.method === 'HEAD' ? '' : JSON.stringify({ error: 'Skript nicht verfügbar' }));
+      return true;
+    }
+    const headers = {
+      'Content-Type': 'text/javascript; charset=utf-8',
+      'Cache-Control': 'public, max-age=3600',
+      ETag: a.etag,
+      Vary: 'Accept-Encoding',
+      'X-Content-Type-Options': 'nosniff',
+      'Cross-Origin-Resource-Policy': 'cross-origin',
+      'Access-Control-Allow-Origin': '*',
+    };
+    const inm = req.headers['if-none-match'];
+    if (inm && inm.split(',').some((t) => t.trim().replace(/^W\//, '') === a.etag)) {
+      res.writeHead(304, headers);
+      res.end();
+      return true;
+    }
+    const gzip = /\bgzip\b/i.test(req.headers['accept-encoding'] || '');
+    const body = gzip ? a.gz : a.raw;
+    if (gzip) headers['Content-Encoding'] = 'gzip';
+    headers['Content-Length'] = body.length;
+    res.writeHead(200, headers);
+    res.end(req.method === 'HEAD' ? undefined : body);
+    return true;
+  };
+}