4.1 React Query 설치 및 Provider 구성 o

src/lib/ratelimit.ts

@@ -0,0 +1,23 @@
+type Key = string;
+
+const bucket: Map<Key, number[]> = new Map();
+
+export function getClientKey(req: Request, extra?: string): string {
+  const ip = req.headers.get("x-forwarded-for")?.split(",")[0]?.trim() || "local";
+  return extra ? `${ip}:${extra}` : ip;
+}
+
+export function isRateLimited(key: string, max: number, windowMs: number): boolean {
+  const now = Date.now();
+  const windowStart = now - windowMs;
+  const arr = bucket.get(key)?.filter((t) => t >= windowStart) ?? [];
+  if (arr.length >= max) {
+    bucket.set(key, arr); // cleanup
+    return true;
+  }
+  arr.push(now);
+  bucket.set(key, arr);
+  return false;
+}
+
+