Fix authentication flow and document Firebase SDK security

- Fixed async/await handling in login button click handler
- Added getCurrentSession() method for backward compatibility
- Improved error handling and user feedback during login
- Added comprehensive security documentation to Firebase SDK
- Clarified that Firebase API keys are designed to be public
- Security is enforced through database rules, not API key secrecy

Author: Archith

api/auth/login.js

@@ -26,10 +26,33 @@ module.exports = async (req, res) => {
     return res.status(405).json({ error: 'Method not allowed' });
   }
 
-  const { email, password } = req.body;
+  // Parse body if it's a string (Vercel sometimes doesn't parse JSON automatically)
+  let body = req.body;
+  if (typeof body === 'string') {
+    try {
+      body = JSON.parse(body);
+    } catch (e) {
+      return res.status(400).json({ error: 'Invalid JSON in request body' });
+    }
+  }
+
+  // Debug logging (remove in production)
+  console.log('Request body type:', typeof req.body);
+  console.log('Request body:', req.body);
+  console.log('Parsed body:', body);
+
+  const { email, password } = body || {};
 
   if (!email || !password) {
-    return res.status(400).json({ error: 'Email and password required' });
+    return res.status(400).json({ 
+      error: 'Email and password required',
+      debug: process.env.NODE_ENV !== 'production' ? {
+        bodyType: typeof req.body,
+        hasBody: !!req.body,
+        hasEmail: !!email,
+        hasPassword: !!password
+      } : undefined
+    });
   }
 
   try {

lib/firebase-sdk.js

@@ -1,20 +1,58 @@
-// Initialize Firebase
+/**
+ * Firebase SDK Configuration
+ * 
+ * SECURITY NOTE:
+ * - Firebase API keys are designed to be public and included in client-side code
+ * - Security is enforced through Firebase Security Rules (database.rules.secure.json)
+ * - These keys only identify your project, they don't grant access
+ * - Access control is managed by:
+ *   1. Database Security Rules (configured in Firebase Console)
+ *   2. Authentication (handled by our backend API)
+ *   3. CORS settings and domain restrictions
+ * 
+ * For additional security:
+ * - Database rules restrict access to authenticated users only
+ * - Admin functions require JWT tokens from our backend
+ * - Consider enabling App Check for additional client verification
+ */
+
+// Initialize Firebase with public configuration
+// These are CLIENT-SIDE keys that are safe to expose
 var config = {
   apiKey: "AIzaSyDaTXD54QykZ7IIT8Ji9mZBqxhijRKLd3U",
   authDomain: "sneakers-688b6.firebaseapp.com",
   databaseURL: "https://sneakers-688b6.firebaseio.com",
   storageBucket: "sneakers-688b6.appspot.com",
-  messagingSenderId: "553327129273"
+  messagingSenderId: "553327129273",
+  projectId: "sneakers-688b6"
 };
 
-console.log('🔥 Initializing Firebase with config:', config.databaseURL);
-firebase.initializeApp(config);
+// Initialize Firebase
+try {
+  firebase.initializeApp(config);
+  console.log('✅ Firebase initialized');
+  
+  // Monitor connection status
+  firebase.database().ref('.info/connected').on('value', function(snapshot) {
+    if (snapshot.val() === true) {
+      console.log('✅ Firebase connected');
+    } else {
+      console.warn('⚠️ Firebase disconnected - check your internet connection');
+    }
+  });
+} catch (error) {
+  console.error('❌ Firebase initialization error:', error);
+}
 
-// Test Firebase connection
-firebase.database().ref('.info/connected').on('value', function(snapshot) {
-  if (snapshot.val() === true) {
-    console.log('✅ Firebase connected successfully!');
-  } else {
-    console.log('⚠️ Firebase disconnected');
-  }
-});
+// Security reminder for developers
+if (window.location.hostname === 'localhost') {
+  console.info(
+    '%c⚠️ Security Reminder',
+    'background: yellow; color: black; padding: 5px;',
+    '\nFirebase config is public by design. Security is enforced through:\n' +
+    '1. Database Security Rules (database.rules.secure.json)\n' +
+    '2. Backend authentication (Vercel API)\n' +
+    '3. Never store sensitive data in client-side code\n' +
+    '4. Use environment variables for server-side secrets only'
+  );
+}

scripts/app.js

@@ -98,19 +98,33 @@
     });
 
     // Login
-    adminLoginBtn.addEventListener('click', function() {
+    adminLoginBtn.addEventListener('click', async function() {
       const email = adminEmail.value.trim();
       const password = adminPassword.value;
 
-      const result = Auth.loginAdmin(email, password);
-      
-      if (result.success) {
-        document.getElementById('adminLoginModal').style.display = 'none';
-        document.getElementById('adminDashboardModal').style.display = 'flex';
-        setupAdminDashboard();
-      } else {
-        loginError.textContent = result.error;
+      // Show loading state
+      adminLoginBtn.disabled = true;
+      adminLoginBtn.textContent = 'Logging in...';
+      loginError.style.display = 'none';
+
+      try {
+        const result = await Auth.loginAdmin(email, password);
+        
+        if (result.success) {
+          document.getElementById('adminLoginModal').style.display = 'none';
+          document.getElementById('adminDashboardModal').style.display = 'flex';
+          setupAdminDashboard();
+        } else {
+          loginError.textContent = result.error;
+          loginError.style.display = 'block';
+        }
+      } catch (error) {
+        loginError.textContent = 'Login failed. Please try again.';
         loginError.style.display = 'block';
+      } finally {
+        // Reset button state
+        adminLoginBtn.disabled = false;
+        adminLoginBtn.textContent = 'Login';
       }
     });
 

scripts/auth-api.js

@@ -102,9 +102,10 @@ const Auth = (function() {
 
       return { success: false, error: data.error || 'Authentication failed' };
     } catch (error) {
+      console.error('API login error:', error);
       return { 
         success: false, 
-        error: error.message || 'Network error. Please check your connection.' 
+        error: 'Server connection failed. Please check if the API is running.'
       };
     }
   }
@@ -220,6 +221,15 @@ const Auth = (function() {
     }, 5 * 60 * 1000);
   }
 
+  // Get current session (compatibility with app.js)
+  function getCurrentSession() {
+    return {
+      isAdmin: session.isAdmin,
+      userName: session.userName,
+      email: session.email
+    };
+  }
+  
   // Public API
   return {
     loginAdmin,
@@ -228,6 +238,7 @@ const Auth = (function() {
     isAdmin,
     isAuthenticated,
     getCurrentUser,
+    getCurrentSession,  // Added for compatibility
     getAuthHeaders,
     verifySession
   };