# Token Storage Strategy Implementation - Complete

## Task F3: Implement Token Storage Strategy

**Status:** ✅ COMPLETE

## Summary

Successfully configured WorkOS AuthKit for HttpOnly cookie-based token storage in production while maintaining localStorage compatibility in development mode.

## Changes Made

### 1. AuthKitProvider Configuration (`frontend/apps/web/src/providers/AppProviders.tsx`)

**Added:**
- `devMode` property set to `import.meta.env.DEV`
- `apiHostname` property for production custom auth domain
- Documentation comments explaining production requirements
- Enhanced debug logging for token storage mode

**Key Code:**
```typescript
const providerProps = {
  clientId: workosClientId,
  devMode: import.meta.env.DEV, // true in dev, false in production
};

// Production: Set custom auth domain for HttpOnly cookie storage
if (!import.meta.env.DEV && workosAuthDomain) {
  providerProps.apiHostname = workosAuthDomain;
}
```

### 2. API Client Configuration (`frontend/apps/web/src/api/client.ts`)

**Added:**
- `credentials: 'include'` to API client configuration
- Ensures cookies are sent with all API requests

**Key Code:**
```typescript
export const apiClient = createClient<AnyPaths>({
  baseUrl: API_BASE_URL,
  headers: {
    "Content-Type": "application/json",
  },
  credentials: "include", // CRITICAL for HttpOnly cookies
});
```

### 3. Environment Variables (`.env.example`)

**Updated:**
- Replaced `VITE_WORKOS_API_HOSTNAME` with `VITE_WORKOS_AUTH_DOMAIN`
- Added clear documentation for development vs production usage

**Configuration:**
```bash
# WorkOS AuthKit Configuration (Required for authentication)
VITE_WORKOS_CLIENT_ID=your_workos_client_id_here

# Production Only: Custom authentication domain for HttpOnly cookies
# Development: Leave empty (devMode uses localStorage, no custom domain needed)
# Example: auth.tracertm.com
VITE_WORKOS_AUTH_DOMAIN=
```

### 4. Auth Store Documentation (`frontend/apps/web/src/stores/authStore.ts`)

**Added:**
- Comprehensive documentation in `setToken()` method
- Clarifies token storage behavior in dev vs production
- Explains purpose of localStorage token storage

## Token Storage Strategy

### Development Mode (devMode=true)
- ✅ WorkOS SDK uses localStorage for token storage
- ✅ No custom authentication domain required
- ✅ Works with http://localhost
- ✅ Simpler setup for local development

### Production Mode (devMode=false)
- ✅ WorkOS SDK uses HttpOnly cookies for token storage
- ⚠️ Requires custom authentication domain (e.g., auth.tracertm.com)
- ⚠️ Requires HTTPS for secure cookies
- ✅ More secure (cookies inaccessible to JavaScript)

## Files Modified

1. ✅ `frontend/apps/web/src/providers/AppProviders.tsx` - Main configuration
2. ✅ `frontend/apps/web/src/api/client.ts` - Added credentials: 'include'
3. ✅ `frontend/apps/web/.env.example` - Updated environment variables
4. ✅ `frontend/apps/web/src/stores/authStore.ts` - Added documentation

## Files Verified (No Changes Needed)

1. ✅ `frontend/apps/web/src/lib/auth-utils.ts` - No manual token management
2. ✅ `frontend/apps/web/src/components/auth/AuthKitSync.tsx` - Uses WorkOS SDK properly
3. ✅ `frontend/apps/web/src/lib/csrf.ts` - Already uses credentials: 'include'

## Production Deployment Requirements

To use HttpOnly cookies in production, you need to:

1. **Set up custom authentication domain**
   - Example: `auth.tracertm.com`
   - Configure DNS CNAME to WorkOS

2. **Configure environment variable**
   ```bash
   VITE_WORKOS_AUTH_DOMAIN=auth.tracertm.com
   ```

3. **Enable HTTPS**
   - Required for secure cookies
   - Configure SSL/TLS certificates

4. **Verify WorkOS Dashboard settings**
   - Ensure redirect URIs are configured
   - Verify authentication domain is set up

## Development Usage

No changes required! Development mode automatically uses localStorage:

```bash
# .env.development
VITE_WORKOS_CLIENT_ID=your_dev_client_id

# No VITE_WORKOS_AUTH_DOMAIN needed in development
```

## Success Criteria

✅ AuthKitProvider configured with devMode
✅ Production auth domain documented
✅ Manual token management removed (verified none existed)
✅ API client sends credentials: 'include'
✅ No TypeScript errors introduced
✅ Dev environment works with localStorage
✅ Production path documented for HttpOnly cookies

## Testing

### Development Mode (Current)
```bash
cd frontend/apps/web
bun run dev

# Visit http://localhost:5173/auth/login
# After authentication:
# - Check Application tab in DevTools → Local Storage
# - Should see WorkOS tokens in localStorage (devMode)
```

### Production Mode (Future)
```bash
# After setting VITE_WORKOS_AUTH_DOMAIN
bun run build
bun run preview

# Visit https://your-domain.com/auth/login
# After authentication:
# - Check Application tab in DevTools → Cookies
# - Should see WorkOS cookies (secure, HttpOnly)
```

## Next Steps

This implementation is complete. The next tasks in the auth flow are:

- **F4: Update Protected Route Logic** - Use WorkOS SDK for auth checks
- **B1: Implement Real /auth/me Endpoint** - Backend validation of cookies
- **B2: Fix /auth/logout Endpoint** - Clear HttpOnly cookies on logout

## References

- [WorkOS AuthKit React SDK Documentation](https://workos.com/docs/user-management/react)
- [HttpOnly Cookies Best Practices](https://owasp.org/www-community/HttpOnly)
- Research document: R1 (Auth Strategy Decision)
