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middleware/rateLimiter.middleware.js

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+/***********************************************************************************************************************************************************************
+ * File Name: rateLimiter.middleware.js
+ * Type of Program: Middleware
+ * Description: Express-rate-limit configurations for different route tiers.
+ *              - globalLimiter      → applied to ALL routes (1000 req / 15 min)
+ *              - authLimiter        → applied to login/register (20 req / 15 min)
+ *              - otpLimiter         → applied to OTP send/verify (5 req / 15 min)
+ *              - sensitiveOpsLimiter → password change, account delete (10 req / hour)
+ * Author: rgrgogu
+ * Date Created: Oct. 6, 2025
+ ***********************************************************************************************************************************************************************
+ * HOW TO USE:
+ *   const { authLimiter } = require('../middleware/rateLimiter.middleware');
+ *   router.post('/login', authLimiter, loginHandler);
+ ***********************************************************************************************************************************************************************/
+const rateLimit = require('express-rate-limit');
+
+const windowMs15 = 15 * 60 * 1000; // 15 minutes
+
+/** Applied globally in server.js */
+const globalLimiter = rateLimit({
+  windowMs: windowMs15,
+  max: 1000,
+  standardHeaders: true,
+  legacyHeaders: false,
+  message: { status: 'error', message: 'Too many requests, please try again later.' },
+});
+
+/** Login & register routes */
+const authLimiter = rateLimit({
+  windowMs: windowMs15,
+  max: 20,
+  standardHeaders: true,
+  legacyHeaders: false,
+  message: { status: 'error', message: 'Too many auth attempts. Please wait 15 minutes.' },
+});
+
+/** OTP send / verify */
+const otpLimiter = rateLimit({
+  windowMs: windowMs15,
+  max: 5,
+  standardHeaders: true,
+  legacyHeaders: false,
+  message: { status: 'error', message: 'Too many OTP requests. Please wait 15 minutes.' },
+});
+
+/** Password change, account delete */
+const sensitiveOpsLimiter = rateLimit({
+  windowMs: 60 * 60 * 1000, // 1 hour
+  max: 10,
+  standardHeaders: true,
+  legacyHeaders: false,
+  message: { status: 'error', message: 'Too many sensitive operations. Please wait 1 hour.' },
+});
+
+/** Admin routes — tighter than global */
+const adminLimiter = rateLimit({
+  windowMs: windowMs15,
+  max: 200,
+  standardHeaders: true,
+  legacyHeaders: false,
+  message: { status: 'error', message: 'Too many admin requests. Please wait 15 minutes.' },
+});
+
+module.exports = { globalLimiter, authLimiter, otpLimiter, sensitiveOpsLimiter, adminLimiter };