Fix rate limiting for admin users

- Add skip function to rate limiter that bypasses limits for authenticated admins
- Verify JWT token to identify admin users
- Admin users can now make unlimited API requests
- Other users still subject to rate limits (100 requests per 15 minutes)

backend/server.js

@@ -3,6 +3,7 @@ const express = require('express');
 const helmet = require('helmet');
 const cors = require('cors');
 const rateLimit = require('express-rate-limit');
+const jwt = require('jsonwebtoken');
 const path = require('path');
 const { initializeDatabase } = require('./src/database/db');
 const { startFileWatcher } = require('./src/services/fileWatcher');
@@ -46,10 +47,23 @@ const corsOptions = {
 
 app.use(cors(corsOptions));
 
-// Rate limiting
+// Rate limiting with admin bypass
 const limiter = rateLimit({
   windowMs: 15 * 60 * 1000, // 15 minutes
-  max: 100 // limit each IP to 100 requests per windowMs
+  max: 100, // limit each IP to 100 requests per windowMs
+  skip: (req) => {
+    // Skip rate limiting for authenticated admin users
+    if (req.path.startsWith('/api/admin/') && req.headers.authorization) {
+      const token = req.headers.authorization.replace('Bearer ', '');
+      try {
+        const decoded = jwt.verify(token, process.env.JWT_SECRET);
+        return decoded.type === 'admin';
+      } catch (err) {
+        return false;
+      }
+    }
+    return false;
+  }
 });
 
 const authLimiter = rateLimit({
@@ -57,6 +71,7 @@ const authLimiter = rateLimit({
   max: 5 // limit auth attempts
 });
 
+// Apply rate limiting - admin routes check will skip for valid admin tokens
 app.use('/api/', limiter);
 app.use('/api/auth', authLimiter);