initial commit

backend/middleware/auth.js

@@ -0,0 +1,23 @@
+const jwt = require('jsonwebtoken');
+
+const JWT_SECRET = process.env.JWT_SECRET || 'your-secret-key-change-in-production';
+
+function authenticateToken(req, res, next) {
+  const authHeader = req.headers['authorization'];
+  const token = authHeader && authHeader.split(' ')[1]; // Bearer TOKEN
+
+  if (!token) {
+    return res.status(401).json({ error: 'Access token required' });
+  }
+
+  jwt.verify(token, JWT_SECRET, (err, user) => {
+    if (err) {
+      return res.status(403).json({ error: 'Invalid or expired token' });
+    }
+    req.user = user;
+    next();
+  });
+}
+
+module.exports = { authenticateToken, JWT_SECRET };
+