feat: add rate limit plugin with Redis

Made-with: Cursor

src/plugins/rateLimit.ts

@@ -0,0 +1,59 @@
+import { FastifyInstance, FastifyPluginAsync } from 'fastify';
+import rateLimit from '@fastify/rate-limit';
+import fp from 'fastify-plugin';
+import { env } from '../config/env.js';
+
+declare module 'fastify' {
+  interface FastifyInstance {
+    rateLimitOptions: {
+      login: { max: number; timeWindow: string };
+      register: { max: number; timeWindow: string };
+      forgotPassword: { max: number; timeWindow: string };
+      verifyEmail: { max: number; timeWindow: string };
+      apiAuthed: { max: number; timeWindow: string };
+      apiGuest: { max: number; timeWindow: string };
+    };
+  }
+}
+
+const rateLimitPlugin: FastifyPluginAsync = async (app: FastifyInstance) => {
+  const options = {
+    login: { max: env.RATE_LIMIT_LOGIN, timeWindow: '15 minutes' },
+    register: { max: env.RATE_LIMIT_REGISTER, timeWindow: '1 hour' },
+    forgotPassword: { max: env.RATE_LIMIT_FORGOT_PASSWORD, timeWindow: '1 hour' },
+    verifyEmail: { max: env.RATE_LIMIT_VERIFY_EMAIL, timeWindow: '15 minutes' },
+    apiAuthed: { max: env.RATE_LIMIT_API_AUTHED, timeWindow: '1 minute' },
+    apiGuest: { max: env.RATE_LIMIT_API_GUEST, timeWindow: '1 minute' },
+  };
+
+  app.decorate('rateLimitOptions', options);
+
+  await app.register(rateLimit, {
+    max: options.apiGuest.max,
+    timeWindow: options.apiGuest.timeWindow,
+    keyGenerator: (req) => {
+      return (req.ip ?? 'unknown') as string;
+    },
+    redis: app.redis,
+    addHeadersOnExceeding: {
+      'x-ratelimit-limit': true,
+      'x-ratelimit-remaining': true,
+      'x-ratelimit-reset': true,
+    },
+    addHeaders: {
+      'x-ratelimit-limit': true,
+      'x-ratelimit-remaining': true,
+      'x-ratelimit-reset': true,
+      'retry-after': true,
+    },
+    errorResponseBuilder: (_req, context) => ({
+      error: {
+        code: 'RATE_LIMIT_EXCEEDED',
+        message: 'Too many requests, please try again later',
+        retryAfter: context.ttl,
+      },
+    }),
+  });
+};
+
+export default fp(rateLimitPlugin, { name: 'rateLimit', dependencies: ['redis'] });