Add Docker build workflow and mobile application

transit_api/middleware.js

@@ -0,0 +1,23 @@
+const jwt = require('jsonwebtoken');
+require('dotenv').config();
+
+const JWT_SECRET = process.env.JWT_SECRET;
+
+// Middleware to verify JWT token
+const authMiddleware = (req, res, next) => {
+  const auth = req.headers.authorization;
+  if (!auth || !auth.startsWith('Bearer ')) {
+    return res.status(401).json({ error: 'missing_token' });
+  }
+
+  const token = auth.slice(7);
+  try {
+    const payload = jwt.verify(token, JWT_SECRET);
+    req.user = payload;
+    next();
+  } catch (err) {
+    return res.status(401).json({ error: 'invalid_token' });
+  }
+};
+
+module.exports = { authMiddleware };