AI Implementation feature(820): Project Scaffold and Platform Foundations (#1)

backend/src/common/services/registration-rate-limit.service.ts

@@ -0,0 +1,21 @@
+import { Injectable } from '@nestjs/common';
+
+const WINDOW_MS = 60_000;
+const MAX_PER_WINDOW = 10;
+
+@Injectable()
+export class RegistrationRateLimitService {
+  private hits: Map<string, number[]> = new Map();
+
+  isAllowed(ip: string, now: number = Date.now()): boolean {
+    const arr = (this.hits.get(ip) ?? []).filter((t) => now - t < WINDOW_MS);
+    this.hits.set(ip, arr);
+    return arr.length < MAX_PER_WINDOW;
+  }
+
+  record(ip: string, now: number = Date.now()): void {
+    const arr = (this.hits.get(ip) ?? []).filter((t) => now - t < WINDOW_MS);
+    arr.push(now);
+    this.hits.set(ip, arr);
+  }
+}