# Authentication Login Loop Fix

## Problem Description

Users experienced a login loop where:
1. User enters valid credentials and login succeeds
2. User gets redirected to dashboard initially
3. Dashboard immediately redirects back to login page
4. This creates an infinite loop preventing access to the dashboard

## Root Cause Analysis

The issue was a **client-server authentication mismatch** in the authentication system:

### The Problem Flow
1. **Login API** (`/src/pages/api/auth/login.ts`): Sets httpOnly cookies using server-side Supabase client ✅
2. **Dashboard Server** (`/src/pages/admin/dashboard.astro`): Reads httpOnly cookies using server-side Supabase client ✅
3. **Dashboard Client Script** (`/src/lib/admin-api-router.ts`): Attempts to read httpOnly cookies using client-side Supabase client ❌

### Technical Details
- **httpOnly cookies**: Cannot be accessed by client-side JavaScript for security
- **Client-side Supabase**: `supabase.auth.getSession()` fails when cookies are httpOnly
- **Authentication mismatch**: Server says "authenticated" but client says "not authenticated"

### Secondary Issues Found
- **Missing database column**: Admin dashboard tried to select non-existent `is_super_admin` column
- **Database query failures**: Caused authentication to fail even with valid sessions

## Solution Implementation

### 1. Fixed Admin Dashboard Server-Side Auth
**File**: `/src/pages/admin/dashboard.astro`

**Problem**: 
```typescript
.select('role, organization_id, is_super_admin')  // is_super_admin doesn't exist
```

**Fix**:
```typescript
.select('role, organization_id')  // Removed non-existent column
```

### 2. Created Server-Side Auth Check API
**File**: `/src/pages/api/admin/auth-check.ts` (NEW)

**Purpose**: Provides a server-side authentication check that client-side code can call

**Features**:
- Uses server-side Supabase client with access to httpOnly cookies
- Returns authentication status and user information
- Handles admin role verification
- Provides consistent error handling

**API Response**:
```typescript
{
  authenticated: boolean,
  isAdmin: boolean,
  user?: {
    id: string,
    email: string,
    name: string
  },
  organizationId?: string,
  error?: string
}
```

### 3. Updated Admin API Router
**File**: `/src/lib/admin-api-router.ts`

**Before**:
```typescript
// Tried to use client-side Supabase (fails with httpOnly cookies)
const { data: { session }, error } = await supabase.auth.getSession();
```

**After**:
```typescript
// Uses server-side auth check API
const response = await fetch('/api/admin/auth-check', {
  method: 'GET',
  credentials: 'include'
});
```

## Testing & Validation

### Playwright Automated Testing
Used Playwright to create automated end-to-end tests that:
1. Navigate to login page
2. Fill credentials and submit form
3. Monitor network requests and cookie setting
4. Verify final redirect destination
5. Capture screenshots at each step

### Test Results
- **Before Fix**: Infinite redirect loop between login and dashboard
- **After Fix**: Successful login and stable dashboard access

### Test Files
- `/home/tyler/apps/bct-whitelabel/test-login.js`: Playwright test script
- `/home/tyler/apps/bct-whitelabel/test-recordings/`: Screenshots and recordings

## Implementation Details

### Authentication Flow (Fixed)
1. **User submits login form**
   - Client sends credentials to `/api/auth/login`
   - Login API validates credentials with Supabase
   - Sets httpOnly session cookies
   - Returns success + redirect path

2. **User redirected to dashboard**
   - Server-side auth check reads httpOnly cookies
   - Validates session and admin status
   - Renders dashboard if authorized

3. **Dashboard client script initializes**
   - Calls `/api/admin/auth-check` endpoint
   - Server validates httpOnly cookies
   - Returns authentication status to client
   - Client proceeds with dashboard functionality

### Security Considerations
- **httpOnly cookies**: Maintain security by preventing client-side access
- **Server-side validation**: All authentication checks use server-side Supabase client
- **API endpoint security**: Auth check API validates session before returning user data

## Files Modified

### Primary Fixes
1. **`/src/pages/admin/dashboard.astro`**
   - Fixed database query (removed `is_super_admin` column)
   - Added proper error handling for user lookup
   - Line 20: `select('role, organization_id')` instead of `select('role, organization_id, is_super_admin')`

2. **`/src/pages/api/admin/auth-check.ts`** (NEW)
   - Created server-side authentication check API
   - Handles admin role verification
   - Returns user information for client-side use

3. **`/src/lib/admin-api-router.ts`**
   - Replaced client-side Supabase auth with API call
   - Line 17-20: Uses `fetch('/api/admin/auth-check')` instead of `supabase.auth.getSession()`

### Supporting Fixes
4. **`/src/pages/api/auth/session.ts`**
   - Changed unauthenticated response from 401 to 200 status
   - Prevents browser console errors for normal "not logged in" state

5. **`/src/pages/login.astro`**
   - Enhanced session cache clearing after successful login
   - Reduced cache duration for more responsive auth checks
   - Added support for force refresh URL parameters

## Monitoring & Maintenance

### Key Metrics to Monitor
- **Login success rate**: Should be near 100% for valid credentials
- **Dashboard load time**: Should not have authentication delays
- **Session API calls**: Should not hit rate limits

### Future Improvements
- **Add `is_super_admin` column**: If super admin functionality is needed
- **Implement Redis caching**: For better session caching in production
- **Add authentication middleware**: For more centralized auth handling

## Troubleshooting

### Common Issues
1. **"User not authenticated or not admin" error**
   - Check if user has `admin` role in database
   - Verify session cookies are being set correctly

2. **404 on `/api/admin/auth-check`**
   - Ensure the new API endpoint file was deployed
   - Check that the file is in the correct location

3. **Still getting login loops**
   - Clear browser cookies and sessionStorage
   - Check if admin dashboard is using the updated admin-api-router

### Debug Commands
```bash
# Check user role in database
psql -c "SELECT email, role FROM users WHERE email = 'user@example.com';"

# Test auth check API directly
curl -H "Cookie: sb-..." http://localhost:3000/api/admin/auth-check

# Monitor auth-related logs
docker logs bct-astro-dev | grep -E "(LOGIN|AUTH|ADMIN)"
```

## Impact Summary

✅ **Fixed**: Login loop preventing dashboard access  
✅ **Improved**: Authentication system reliability  
✅ **Enhanced**: Error handling and debugging capabilities  
✅ **Maintained**: Security with httpOnly cookies  
✅ **Added**: Automated testing for authentication flow  

The authentication system now works seamlessly across all user types and provides a stable foundation for the application.