Features:
- Complete Google OAuth 2.0 integration with ID token and authorization code flows
- Enhanced User model with Google OAuth fields (google_id, is_google_user, email_verified, profile_picture)
- Google OAuth service for token verification and user info extraction
- Multiple authentication endpoints:
- GET /auth/google/oauth-url (get OAuth URL for frontend)
- POST /auth/google/login-with-token (direct ID token login)
- POST /auth/google/login-with-code (authorization code exchange)
- Smart user handling: creates new users or links existing accounts
- Issues own JWT tokens after Google authentication
- Database migration 004 for Google OAuth fields
- Enhanced login logic to handle Google vs password users
- Comprehensive README with Google OAuth setup instructions
- Frontend integration examples for both OAuth flows
Google OAuth automatically:
- Creates user accounts on first login
- Links existing email accounts to Google
- Extracts profile information (name, picture, locale)
- Verifies email addresses
- Issues secure JWT tokens for API access
