Added #

• Core Authentication Interface: Abstract IAuthManager interface for dependency inversion
• Comprehensive Data Models: Type-safe models using flutter_shared_utilities BaseDataModel
  • AuthUserModel: Complete user profile information with provider data
  • AuthStateModel: Real-time authentication state management
  • AuthResultModel: Detailed operation results with success/failure states
  • AuthErrorModel: Comprehensive error handling with user-friendly messages
• Firebase Authentication Implementation: Full Firebase Auth integration
  • Email/password authentication (sign in, sign up)
  • Anonymous authentication
  • Google Sign-In integration
  • Apple Sign-In integration
  • Account deletion functionality
• Social Authentication Support:
  • Google Sign-In with full profile data
  • Apple Sign-In with privacy-focused implementation
  • Extensible framework for additional providers
• Authentication State Management:
  • Real-time state updates via streams
  • Authentication status tracking (authenticated, unauthenticated, unknown)
  • Loading state management
  • Error state handling
• Comprehensive Error Handling:
  • Firebase Auth error conversion
  • User-friendly error messages
  • Error categorization (network, user, system, permission)
  • Retryable error identification
• Validation Utilities:
  • Email format validation
  • Phone number format validation
  • Password strength validation with scoring (0-4)
  • Provider support validation
• Session Management Framework:
  • Session timeout configuration
  • Token refresh capabilities
  • Session validation methods
• Analytics and Monitoring:
  • Authentication operation statistics
  • Debug logging capabilities
  • Authentication event tracking
• Configuration Management:
  • Configurable authentication settings
  • Provider capability management
  • Debug mode toggle
• Example Application: Complete Flutter app demonstrating:
  • Authentication state management
  • Email/password authentication
  • Social authentication (Google, Apple)
  • Anonymous authentication
  • User profile display
  • Account deletion
  • Error handling
• Comprehensive Documentation:
  • Detailed README with setup instructions
  • API documentation
  • Best practices guide
  • Troubleshooting section
  • Migration guide from firebase_auth

Dependencies #

• flutter_shared_utilities: ^1.0.5 - Type-safe data models and utilities
• firebase_core: ^3.14.0 - Firebase core functionality
• firebase_auth: ^5.6.0 - Firebase authentication services
• google_sign_in: ^6.3.0 - Google Sign-In integration
• sign_in_with_apple: ^7.0.1 - Apple Sign-In integration
• local_auth: ^2.3.0 - Biometric authentication support
• crypto: ^3.0.6 - Cryptographic utilities for secure operations
• dart_jsonwebtoken: ^3.2.0 - JWT token handling and validation
• app_logger_manager: ^1.0.2 - Comprehensive logging and debugging

Project Structure #

lib/
├── src/
│   ├── constants/
│   │   └── auth_constants.dart          # Authentication constants
│   ├── interfaces/
│   │   └── i_auth_manager.dart          # Abstract authentication interface
│   ├── models/
│   │   ├── auth_user_model.dart         # User data model
│   │   ├── auth_state_model.dart        # Authentication state model
│   │   ├── auth_result_model.dart       # Operation result model
│   │   └── auth_error_model.dart        # Error handling model
│   ├── implementations/
│   │   └── firebase_auth_manager.dart   # Firebase implementation
│   └── mixin/
│       ├── auth_error_mixin.dart        # Error handling utilities
│       ├── auth_mixin.dart              # Core authentication utilities
│       ├── auth_provider_mixin.dart     # Provider-specific utilities
│       └── auth_validation_mixin.dart   # Validation utilities
└── app_auth_manager.dart                # Main export file
example/
├── lib/
│   ├── main.dart                        # Main application entry
│   ├── auth_example_app.dart            # App configuration
│   ├── pages/                           # Application pages
│   ├── theme/                           # App theming
│   └── widgets/                         # Reusable widgets
├── android/                             # Android configuration
├── ios/                                 # iOS configuration
└── firebase.json                       # Firebase configuration

Features Overview #

• ✅ Email/Password Authentication - Complete sign-up and sign-in flow
• ✅ Anonymous Authentication - Guest access functionality
• ✅ Google Sign-In - Full profile integration
• ✅ Apple Sign-In - Privacy-focused authentication
• ✅ Account Management - Profile updates and account deletion
• ✅ Error Handling - Comprehensive error management
• ✅ State Management - Real-time authentication state
• ✅ Validation - Input validation and password strength
• ✅ Analytics - Authentication operation tracking
• ⏳ Phone Authentication - SMS verification (planned)
• ⏳ Email Verification - Email confirmation flow (planned)
• ⏳ Password Reset - Password recovery (planned)
• ⏳ Multi-Factor Authentication - Enhanced security (planned)
• ⏳ Biometric Authentication - Fingerprint/Face ID (planned)
• ⏳ Additional Social Providers - Facebook, Twitter, GitHub (planned)

API Overview #

// Initialize authentication manager using factory constructor
final authManager = await FirebaseAuthManager.create();

// Email/password authentication
final signUpResult = await authManager.signUpWithEmailAndPassword(
  email: 'user@example.com',
  password: 'securePassword123',
  displayName: 'John Doe',
);

final signInResult = await authManager.signInWithEmailAndPassword(
  email: 'user@example.com',
  password: 'securePassword123',
);

// Social authentication
final googleResult = await authManager.signInWithGoogle();
final appleResult = await authManager.signInWithApple();

// Anonymous authentication
final anonymousResult = await authManager.signInAnonymously();

// State management
StreamBuilder<AuthStateModel>(
  stream: authManager.authStateStream,
  builder: (context, snapshot) {
    final state = snapshot.data ?? AuthStateModel.initial();
    return state.isAuthenticated
      ? HomePage(user: state.user!)
      : LoginPage();
  },
);

// Error handling
if (result.isFailure) {
  final userMessage = authManager.getUserFriendlyErrorMessage(result.errorCode);
  ScaffoldMessenger.of(context).showSnackBar(
    SnackBar(content: Text(userMessage)),
  );
}

Documentation #

• Setup Guide: Complete Firebase, Google, and Apple Sign-In configuration
• API Reference: Detailed method documentation
• Best Practices: Security and implementation guidelines
• Migration Guide: Easy migration from firebase_auth package
• Troubleshooting: Common issues and solutions
• Example App: Full working implementation

Testing #

• Abstract interface enables easy mocking for unit tests
• Example app provides integration testing reference
• Comprehensive error handling for robust testing scenarios

Security Features #

• Input validation for all authentication methods
• Password strength validation with configurable requirements
• Session timeout management
• Secure token handling
• Error message sanitization
• Provider-specific security implementations

Performance #

• Lazy initialization of authentication providers
• Efficient state management with streams
• Minimal dependencies for core functionality
• Optimized for production use

Accessibility #

• User-friendly error messages
• Comprehensive documentation
• Clear API design
• Support for assistive technologies