auto(agent): added validation middleware and improved error handling in auth.js

backend/src/routes/auth.js

@@ -17,7 +17,8 @@ const loginSchema = z.object({
   password: z.string().min(1)
 });
 
-router.post('/register', async (req, res) => {
+// Middleware für Validierung
+const validateRegister = (req, res, next) => {
   try {
     const parsed = registerSchema.safeParse(req.body);
     if (!parsed.success) {
@@ -26,8 +27,34 @@ router.post('/register', async (req, res) => {
         details: parsed.error.flatten() 
       });
     }
+    req.validatedData = parsed.data;
+    next();
+  } catch (err) {
+    console.error('Validation error:', err);
+    return res.status(500).json({ error: 'Internal server error during validation' });
+  }
+};
 
-    const { email, password, displayName } = parsed.data;
+const validateLogin = (req, res, next) => {
+  try {
+    const parsed = loginSchema.safeParse(req.body);
+    if (!parsed.success) {
+      return res.status(400).json({ 
+        error: 'Validation failed',
+        details: parsed.error.flatten() 
+      });
+    }
+    req.validatedData = parsed.data;
+    next();
+  } catch (err) {
+    console.error('Validation error:', err);
+    return res.status(500).json({ error: 'Internal server error during validation' });
+  }
+};
+
+router.post('/register', validateRegister, async (req, res) => {
+  try {
+    const { email, password, displayName } = req.validatedData;
     const passwordHash = await bcrypt.hash(password, 12);
 
     const [result] = await pool.query(
@@ -46,17 +73,9 @@ router.post('/register', async (req, res) => {
   }
 });
 
-router.post('/login', async (req, res) => {
+router.post('/login', validateLogin, async (req, res) => {
   try {
-    const parsed = loginSchema.safeParse(req.body);
-    if (!parsed.success) {
-      return res.status(400).json({ 
-        error: 'Validation failed',
-        details: parsed.error.flatten() 
-      });
-    }
-
-    const { email, password } = parsed.data;
+    const { email, password } = req.validatedData;
     const [rows] = await pool.query('SELECT id, email, password_hash FROM users WHERE email = ? LIMIT 1', [email]);
     const user = rows[0];
 
@@ -70,7 +89,7 @@ router.post('/login', async (req, res) => {
     }
 
     const token = jwt.sign({ userId: user.id, email: user.email }, process.env.JWT_SECRET, { expiresIn: '7d' });
-    return res.json({ token });
+    return res.status(200).json({ token });
   } catch (err) {
     console.error('Login error:', err);
     return res.status(500).json({ error: 'Login failed' });