# Authentication Routes Implementation Summary

## Overview
Created minimal authentication routes to restore authentication functionality using WorkOS AuthKit integration.

## Files Created

### 1. `/frontend/apps/web/src/routes/auth.login.tsx`
**Purpose**: Login page that triggers WorkOS sign-in flow

**Features**:
- Redirects authenticated users to dashboard
- Shows loading state while checking auth status
- Clean, minimal UI with branded styling
- Single "Sign In with WorkOS" button
- Uses WorkOS AuthKit's `signIn()` method

**Route**: `/auth/login`

### 2. `/frontend/apps/web/src/routes/auth.register.tsx`
**Purpose**: Registration page that triggers WorkOS sign-up flow

**Features**:
- Redirects authenticated users to dashboard
- Shows loading state while checking auth status
- Clean, minimal UI with branded styling
- Single "Sign Up with WorkOS" button
- Link to login page for existing users
- Uses WorkOS AuthKit's `signUp()` method

**Route**: `/auth/register`

### 3. `/frontend/apps/web/src/routes/auth.logout.tsx`
**Purpose**: Logout handler that clears session and redirects

**Features**:
- Clears local auth state via `useAuthStore().logout()`
- Signs out from WorkOS via `signOut()`
- Shows loading/success states
- Automatic redirect to login page
- Error handling with fallback navigation

**Route**: `/auth/logout`

### 4. `/frontend/apps/web/src/routes/auth.callback.tsx` *(Pre-existing - Enhanced)*
**Purpose**: OAuth callback handler for WorkOS authentication

**Features**:
- Comprehensive error handling for OAuth errors
- Loading, success, and error states with appropriate UI
- Handles `returnTo` parameter for post-login redirect
- Retry functionality on error
- Uses `getReturnTo()` utility for safe redirects
- Prevents redirect loops to auth routes

**Route**: `/auth/callback`

## Integration Points

### WorkOS AuthKit Integration
All routes use the `@workos-inc/authkit-react` package:
- `useAuth()` hook for auth state
- `signIn()` for login flow
- `signUp()` for registration flow
- `signOut()` for logout
- Auto-synced via `AuthKitSync` component

### Auth Store Integration
Routes integrate with `/frontend/apps/web/src/stores/authStore.ts`:
- `logout()` - Clears local auth state
- `setAuthFromWorkOS()` - Syncs WorkOS user to store (via AuthKitSync)
- `isAuthenticated` - Auth status check
- `user` - Current user data

### Router Integration
Uses TanStack Router patterns:
- `createFileRoute()` for route definition
- `useNavigate()` for programmatic navigation
- File-based routing: `auth.{page}.tsx` → `/auth/{page}`
- Automatic route tree generation

## Utilities Used

### `/frontend/apps/web/src/lib/auth-utils.ts`
- `getReturnTo()` - Safely extracts and validates returnTo parameter
- `isPublicRoute()` - Checks if route is public auth route

### UI Components
- `Button` from `@tracertm/ui` package
- Lucide icons: `LogIn`, `UserPlus`, `LogOut`, `Loader2`, `AlertCircle`, `CheckCircle`
- Tailwind CSS for styling

## Authentication Flow

### Login Flow
1. User navigates to `/auth/login`
2. Clicks "Sign In with WorkOS"
3. Redirected to WorkOS hosted auth UI
4. After authentication, redirected to `/auth/callback`
5. Callback processes OAuth response
6. `AuthKitSync` syncs user/token to store
7. User redirected to dashboard or `returnTo` URL

### Registration Flow
1. User navigates to `/auth/register`
2. Clicks "Sign Up with WorkOS"
3. Redirected to WorkOS hosted sign-up UI
4. After registration, redirected to `/auth/callback`
5. Callback processes OAuth response
6. `AuthKitSync` syncs user/token to store
7. User redirected to dashboard

### Logout Flow
1. User navigates to `/auth/logout` (or triggers logout action)
2. Local auth store cleared via `logout()`
3. WorkOS session cleared via `signOut()`
4. User redirected to `/auth/login`

## Environment Variables Required

### WorkOS Configuration
```env
VITE_WORKOS_CLIENT_ID=client_...
```

Set in `/frontend/apps/web/.env` or `.env.local`

### Backend API URL
```env
VITE_API_URL=http://localhost:4000
```

## Testing Checklist

- [ ] Login redirects to WorkOS
- [ ] Registration redirects to WorkOS
- [ ] Callback processes OAuth response
- [ ] Auth state syncs correctly
- [ ] Logout clears session
- [ ] ReturnTo parameter works
- [ ] Auth routes redirect when already authenticated
- [ ] Error states display correctly
- [ ] Loading states show during async operations

## Next Steps

### Optional Enhancements
1. **Password Reset Flow**: Add `/auth/reset-password` route
2. **Email Verification**: Handle email verification redirects
3. **Session Timeout**: Add timeout warnings before auto-logout
4. **Remember Me**: Add persistent session option
5. **Multi-Factor Auth**: Integrate WorkOS MFA features

### Backend Integration
Ensure backend endpoints exist:
- `POST /api/v1/auth/login` - Handle login
- `POST /api/v1/auth/logout` - Clear session
- `GET /api/v1/auth/me` - Get current user
- `POST /api/v1/auth/refresh` - Refresh token

## Architecture Notes

### Why Minimal?
- WorkOS AuthKit handles all heavy lifting (UI, validation, security)
- No need for custom form validation, password strength checks, etc.
- Reduces attack surface and maintenance burden
- Leverages enterprise-grade auth infrastructure

### Security Considerations
- OAuth 2.0 flow handled by WorkOS
- CSRF protection via `/frontend/apps/web/src/lib/csrf.ts`
- HttpOnly cookies for session management
- Automatic token refresh via `AuthKitSync`
- No passwords stored in frontend

### Performance
- Lazy route loading via TanStack Router
- Minimal bundle size (no heavy auth libraries)
- Fast redirects using `window.location.href` where appropriate
- Prefetching disabled for auth routes (no value, security concern)

## File Paths Reference

```
frontend/apps/web/src/
├── routes/
│   ├── auth.login.tsx          # Login page
│   ├── auth.register.tsx       # Registration page
│   ├── auth.logout.tsx         # Logout handler
│   └── auth.callback.tsx       # OAuth callback
├── stores/
│   └── authStore.ts            # Auth state management
├── lib/
│   ├── auth-utils.ts           # Auth utilities
│   └── csrf.ts                 # CSRF protection
├── components/
│   └── auth/
│       ├── AuthKitSync.tsx     # WorkOS sync component
│       └── ProtectedRoute.tsx  # Route protection
└── providers/
    └── AppProviders.tsx        # AuthKitProvider wrapper
```

## Status
✅ **COMPLETE** - All minimal auth routes implemented and integrated
