fix: validate anonymous notification hub requests

src/handlers/notifications.ts

@@ -1,4 +1,6 @@
 import { AuthService } from '../services/auth';
+import { StorageService } from '../services/storage';
+import { isAuthRequestExpired } from '../services/storage-auth-request-repo';
 import type { Env, JWTPayload } from '../types';
 import { errorResponse, jsonResponse } from '../utils/response';
 import { generateUUID } from '../utils/uuid';
@@ -65,6 +67,12 @@ export async function handleAnonymousNotificationsHub(request: Request, env: Env
     return errorResponse('Expected websocket', 426);
   }
 
+  const storage = new StorageService(env.DB);
+  const authRequest = await storage.getAuthRequestById(authRequestId);
+  if (!authRequest || isAuthRequestExpired(authRequest)) {
+    return errorResponse('Not found', 404);
+  }
+
   const id = env.NOTIFICATIONS_HUB.idFromName(authRequestId);
   const stub = env.NOTIFICATIONS_HUB.get(id);
   const forwardedUrl = new URL(request.url);