refactor: remove obsolete member management API module

packages/next/src/routes/rate-limit.ts

@@ -0,0 +1,102 @@
+import 'server-only';
+
+/**
+ * Simple in-memory rate limiter for API routes.
+ * Tracks request counts per key within sliding time windows.
+ *
+ * For production at scale, consider Upstash Redis or Vercel Edge Config.
+ * This is sufficient for moderate traffic and single-instance deployments.
+ */
+
+interface RateLimitEntry {
+  count: number;
+  resetAt: number;
+}
+
+const store = new Map<string, RateLimitEntry>();
+
+// Cleanup stale entries every 2 minutes
+const CLEANUP_INTERVAL = 2 * 60 * 1000;
+// Hard cap to prevent memory exhaustion under attack
+const MAX_STORE_SIZE = 10_000;
+let lastCleanup = Date.now();
+
+function cleanup() {
+  const now = Date.now();
+
+  if (now - lastCleanup < CLEANUP_INTERVAL) return;
+
+  lastCleanup = now;
+
+  for (const [key, entry] of store) {
+    if (entry.resetAt <= now) {
+      store.delete(key);
+    }
+  }
+
+  // If still over limit after expiry cleanup, evict oldest entries
+  if (store.size > MAX_STORE_SIZE) {
+    const sorted = [...store.entries()].sort(
+      (a, b) => a[1].resetAt - b[1].resetAt,
+    );
+    const toDelete = sorted.slice(0, store.size - MAX_STORE_SIZE);
+
+    for (const [key] of toDelete) {
+      store.delete(key);
+    }
+  }
+}
+
+/**
+ * Check rate limit for a given key.
+ *
+ * @param key - Unique identifier (e.g., IP address, account ID)
+ * @param maxRequests - Maximum requests allowed within the window
+ * @param windowMs - Time window in milliseconds
+ * @returns Object with `allowed` boolean and `remaining` count
+ */
+export function checkRateLimit(
+  key: string,
+  maxRequests: number,
+  windowMs: number,
+): { allowed: boolean; remaining: number; resetAt: number } {
+  cleanup();
+
+  const now = Date.now();
+  const entry = store.get(key);
+
+  if (!entry || entry.resetAt <= now) {
+    // New window
+    store.set(key, { count: 1, resetAt: now + windowMs });
+    return {
+      allowed: true,
+      remaining: maxRequests - 1,
+      resetAt: now + windowMs,
+    };
+  }
+
+  if (entry.count >= maxRequests) {
+    return { allowed: false, remaining: 0, resetAt: entry.resetAt };
+  }
+
+  entry.count++;
+
+  return {
+    allowed: true,
+    remaining: maxRequests - entry.count,
+    resetAt: entry.resetAt,
+  };
+}
+
+/**
+ * Extract client IP from request headers.
+ * Works with Vercel, Cloudflare, and standard proxies.
+ */
+export function getClientIp(request: Request): string {
+  return (
+    request.headers.get('x-forwarded-for')?.split(',')[0]?.trim() ??
+    request.headers.get('x-real-ip') ??
+    request.headers.get('cf-connecting-ip') ??
+    'unknown'
+  );
+}