AUTH_PERSISTENCE_FIX.md

Firebase Authentication Persistence Fix

Problem Identified

Your Firebase authentication was not persisting across page refreshes or navigation. This caused the Firestore rules to deny access because:

1. User logged in → Auth state stored in memory
2. Page refresh → Auth state lost
3. Firestore rules check request.auth != null → Failed (no auth context)
4. Permission denied → "Missing or insufficient permissions" error

Root Cause

Firebase Auth in Next.js defaults to NONE persistence, which means:

• Auth state is only kept in memory during the current session
• Any page refresh, navigation, or window reload clears the auth context
• The Firestore rules can't verify the user's identity

Solution Implemented

1. Enable Browser Local Storage Persistence (src/firebase/provider.tsx)

Added setPersistence() to the Firebase initialization:

import { setPersistence, browserLocalPersistence } from 'firebase/auth';

// Inside FirebaseProvider
setPersistence(auth, browserLocalPersistence).catch((error) => {
  console.warn("Failed to set Firebase auth persistence:", error);
});

What this does:

• Stores authentication token in browser's localStorage
• Automatically restores auth state on page reload
• Persists until user explicitly signs out

2. Apply Persistence to Server Initialization (src/lib/firebase.ts)

Also added persistence to the initializeFirebase() function for consistency:

if (typeof window !== 'undefined') {
    setPersistence(auth, browserLocalPersistence).catch((error) => {
        console.warn("Failed to set Firebase auth persistence:", error);
    });
}

Why both locations:

• provider.tsx: Client-side initialization (React context)
• lib/firebase.ts: Server action initialization (form submissions, data operations)

How It Works Now

1. User logs in

   → signInWithEmailAndPassword() called
   → Token stored in localStorage (via setPersistence)
   → Auth context updated
   

2. Page refresh or navigate

   → Firebase automatically restores auth from localStorage
   → onAuthStateChanged() fires with restored user
   → Firestore rules validate auth successfully
   → User data loads without permission errors
   

3. User logs out

   → signOut() called
   → localStorage auth token cleared
   → Auth state set to null
   

Affected Operations

This fix enables persistent access to:

✅ Login → Profile page (auth state maintained across pages)
✅ Profile edit (Firestore updates work with persistent auth)
✅ Challenge page (can fetch user data without re-authentication)
✅ Connections (read/write operations maintain auth context)
✅ Page refreshes (user stays logged in)

Testing the Fix

1. Login at /login
2. Navigate to /profile → Should load without permissions error
3. Refresh page → Should still be logged in
4. Edit profile → Should save successfully
5. Go to challenge → Should load challenges without errors
6. Close browser/reopen → Session persists (browser localStorage)

Browser Compatibility

browserLocalPersistence works in:

• ✅ Chrome, Firefox, Safari, Edge
• ✅ Mobile browsers
• ❌ Private/Incognito mode (localStorage disabled - falls back to session)

Security Notes

• localStorage access: Accessible to JavaScript on the same domain
• Token expiration: Firebase handles automatic token refresh
• Logout required: Auth persists until user calls signOut()
• No sensitive data in localStorage: Only the auth token (JWT), not passwords

Verification Checklist

After deploying these changes:

• Users can log in
• Auth persists after page refresh
• Profile can be edited without permission errors
• Challenge page loads successfully
• Logout clears the session
• Firestore reads/writes work smoothly

If issues persist, check:

1. Browser dev tools → Application/Storage → localStorage (should have Firebase tokens)
2. Browser console for any setPersistence warnings
3. Firestore rules still allow authenticated reads/writes