Merge commit '80eca1bc7c1174f9c44a8df9af4ddc8ab855291b' as 'cms/core'

cms/core/api/src/ratelimit.js

@@ -0,0 +1,34 @@
+// Einfacher In-Memory-Rate-Limiter (ein Container, eine Instanz → genügt).
+// Fixed-Window pro Schlüssel (Standard: Client-IP). Bei Überschreitung 429.
+// Hinter einem Reverse-Proxy liefert X-Forwarded-For die echte IP.
+
+const buckets = new Map(); // key -> { count, reset }
+
+function clientIp(c) {
+  const xff = c.req.header('x-forwarded-for');
+  if (xff) return xff.split(',')[0].trim();
+  return c.req.header('x-real-ip') || 'unknown';
+}
+
+// max Anfragen je windowMs. keyFn erlaubt eigene Schlüssel (z.B. IP+E-Mail).
+export function rateLimit({ max = 10, windowMs = 60_000, keyFn = clientIp } = {}) {
+  return async (c, next) => {
+    const key = keyFn(c);
+    const now = Date.now();
+    let b = buckets.get(key);
+    if (!b || now > b.reset) { b = { count: 0, reset: now + windowMs }; buckets.set(key, b); }
+    b.count += 1;
+    if (b.count > max) {
+      const retry = Math.ceil((b.reset - now) / 1000);
+      c.header('Retry-After', String(retry));
+      return c.json({ error: 'Zu viele Anfragen — bitte später erneut.' }, 429);
+    }
+    await next();
+  };
+}
+
+// Speicher sauber halten: abgelaufene Buckets periodisch wegräumen.
+setInterval(() => {
+  const now = Date.now();
+  for (const [k, b] of buckets) if (now > b.reset) buckets.delete(k);
+}, 5 * 60_000).unref?.();