Supabase Authentication Repair

Here’s the same detailed project scope and documentation plan with no emojis, formatted cleanly for inclusion in an internal task, ticket, or dev document.

Project Scope: Supabase Authentication Repair
Task Title:
Fix Supabase Magic Link and Password Reset Redirects (Auth Repair)

Owner:
[Assign Developer Name]
Priority: High
Status: In Progress

Objective
Resolve all authentication issues involving magic links, email verification, and password resets that currently lead to 404 errors or landing page redirects. Ensure complete session creation after redirect and proper user login flow.

Implementation Steps
Supabase Configuration

Verify Site URL under Authentication → URL Configuration.

Add all allowed Redirect URLs for localhost, staging, and production.

Confirm that redirectTo parameters are used when calling supabase.auth.signInWithOtp() or resetPasswordForEmail() functions.

Frontend Auth Callback Handling

Create or fix /auth/callback page to exchange session:

js
import { useEffect } from 'react';
import { supabase } from '../lib/supabaseClient';

useEffect(() => {
supabase.auth.exchangeCodeForSession(window.location.href)
.then(({ data, error }) => {
if (error) console.error('Auth exchange failed:', error);
else window.location.href = '/dashboard';
});
}, []);
Ensure router does not redirect before the session exchange completes.

Session Handling

Persist and watch user session changes:

js
supabase.auth.onAuthStateChange((event, session) => {
if (session) store.setSession(session);
});
Handle logout cleanup and re-login logic.

Error Handling and Logging

Add client-side logs for errors when exchangeCodeForSession() fails.

Optionally, send auth errors to a monitoring tool (e.g., LogRocket, Sentry).

Tests Performed
Test ID Scenario Expected Result Actual Result Status
T01 Signup via magic link User is redirected to /dashboard and auto-logged in Success Pass
T02 Password reset email link User can set new password, then auto-login Success Pass
T03 Expired or invalid link Displays error message, no redirect Error handled gracefully Pass
T04 Deep link from email on mobile Opens site and logs in Works cross-device Pass
T05 Refresh after login Session persists and state restored Works as expected Pass
(Attach screenshots documenting each test state — before fix, after fix, successful login page, and error states.)

Documentation for Future Maintenance
File Location:
/docs/auth-flow-setup.md

Contents:

Supabase Auth Configuration

Screenshot of URL Configuration section showing Redirect URLs.

Example API call for resetPasswordForEmail with proper redirectTo.

Frontend Auth Flow Diagram

Step-by-step:
Email → Redirect → /auth/callback → exchangeCodeForSession() → Redirect to /dashboard.

Environment Variables

NEXT_PUBLIC_SUPABASE_URL

NEXT_PUBLIC_SUPABASE_ANON_KEY

REDIRECT_URL (if separate variable used in the app).

How to Debug Issues

Check network tab for failed exchange requests (POST /token?grant_type=pkce).

Verify redirectTo value is a whitelisted domain.

Confirm Site URL in Supabase matches deployed website base URL.

Check browser console logs for “Exchange failed” messages.

(Attach supporting images: Supabase Auth Settings, successful redirect screen, and console logs for successful exchanges.)