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This commit implements a comprehensive OAuth2 authentication framework that provides: **Core Components:** - Generic OAuth2 provider with authorization code and direct token flows - Comprehensive configuration system with pre-configured provider settings - State manager for CSRF protection with secure parameter handling - Token manager for secure storage, refresh detection, and expiration tracking - Flow handler for authorization URLs, code exchange, and user info retrieval **Security Features:** - CSRF protection via cryptographically secure state parameters - Automatic token refresh with configurable thresholds - One-time use state parameter validation - Secure token and user profile storage using StateStore interface - Proper error handling without exposing sensitive information **Pre-configured Providers:** - Google OAuth2 with OpenID Connect support - GitHub OAuth2 with user profile mapping - Microsoft OAuth2 with Graph API integration - Facebook OAuth2 with profile picture handling **Developer Experience:** - Factory pattern for easy provider instantiation - Quick helper functions: QuickGoogle(), QuickGitHub(), QuickMicrosoft(), QuickFacebook() - Flexible configuration supporting maps, structs, and tagged configurations - Extensible profile mapping system for custom providers - Comprehensive error types with descriptive messages **Testing & Documentation:** - 72.8% test coverage with comprehensive unit tests - Mock-based testing for all major components - Detailed README with usage examples and security considerations - Table-driven tests covering success and failure scenarios **Files Added:** - pkg/auth/providers/oauth2/provider.go - Main OAuth2 provider implementation - pkg/auth/providers/oauth2/config.go - Configuration and provider presets - pkg/auth/providers/oauth2/flow.go - OAuth2 flow handlers - pkg/auth/providers/oauth2/state.go - CSRF state parameter management - pkg/auth/providers/oauth2/token.go - Token storage and management - pkg/auth/providers/oauth2/profile.go - User profile mapping utilities - pkg/auth/providers/oauth2/factory.go - Provider factory with quick helpers - pkg/auth/providers/oauth2/types.go - OAuth2 type definitions - pkg/auth/providers/oauth2/errors.go - OAuth2-specific errors - pkg/auth/providers/oauth2/README.md - Comprehensive documentation - Complete test suite for all components This implementation provides the foundation for Phase 2.5 OAuth2 provider implementations while maintaining the plugin architecture principles and security best practices. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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Markdown
# Auth2 Library Implementation Plan
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This document outlines the step-by-step implementation plan for the Auth2 library, a comprehensive, production-ready authentication solution for Go applications.
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## Phase 1: Foundation & Core Architecture
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### 1.1 Project Setup
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- [x] Initialize Go module and directory structure
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- [x] Set up logging with log/slog
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- [x] Create error types and handling mechanisms
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- [x] Implement configuration structures
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### 1.2 Plugin System Architecture
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- [x] Design provider interfaces for each plugin type
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- [x] Implement provider registry for managing registered plugins
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- [x] Create provider metadata system for version and capability information
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- [x] Implement factory pattern for provider instantiation
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- [x] Build provider discovery mechanism
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### 1.3 Core Domain Models
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- [x] Define User model and interfaces
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- [x] Create Context wrapper for auth context
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- [x] Implement base interfaces for all components
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- [x] Build error handling patterns
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## Phase 2: Core Authentication Framework
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### 2.1 Authentication Provider Interface
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- [x] Define AuthProvider interface
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- [x] Create ProviderManager for managing multiple providers
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- [x] Implement provider registration system
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- [x] Build chain-of-responsibility pattern for auth attempts
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### 2.2 Basic Authentication
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- [x] Implement username/password provider
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- [x] Create password hashing utilities (bcrypt, argon2id)
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- [x] Build password policy enforcement
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- [x] Implement account locking mechanism
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### 2.3 WebAuthn/FIDO2 as Primary Authentication
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- [x] Implement WebAuthn passwordless registration
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- [x] Create WebAuthn passwordless authentication
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- [x] Build attestation verification
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- [x] Implement credential storage and management
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- [x] Create dual-mode provider interface for both primary and MFA use
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### 2.4 OAuth2 Framework
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- [x] Design generic OAuth2 provider
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- [x] Implement OAuth2 flow handlers
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- [x] Create token storage and validation
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- [x] Build user profile mapping utilities
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### 2.5 OAuth2 Providers
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- [ ] Implement Google OAuth2 provider
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- [ ] Implement GitHub OAuth2 provider
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- [ ] Implement Microsoft OAuth2 provider
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- [ ] Implement Facebook OAuth2 provider
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### 2.6 SAML Authentication
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- [ ] Implement SAML provider interface
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- [ ] Create SAML assertion parser
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- [ ] Build SAML request/response handlers
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- [ ] Implement metadata handlers
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## Phase 3: Multi-Factor Authentication
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### 3.1 MFA Framework
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- [ ] Define MFA provider interface
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- [ ] Create MFA registration flow
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- [ ] Implement MFA verification flow
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- [ ] Build MFA fallback mechanisms
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### 3.2 TOTP Implementation
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- [ ] Implement TOTP algorithm (RFC 6238)
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- [ ] Create QR code generation for setup
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- [ ] Build key storage and management
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- [ ] Implement validation with drift windows
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### 3.3 WebAuthn/FIDO2 as MFA
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- [x] Implement WebAuthn MFA registration
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- [x] Create WebAuthn MFA verification
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- [x] Build integration with primary authentication methods
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- [ ] Implement fallback mechanisms
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### 3.4 Email OTP
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- [ ] Create email OTP generation
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- [ ] Implement OTP storage and validation
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- [ ] Build email delivery interface
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- [ ] Create rate limiting for OTP requests
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### 3.5 Backup Codes
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- [ ] Implement secure backup code generation
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- [ ] Create storage and validation
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- [ ] Build code regeneration mechanism
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- [ ] Implement usage tracking
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## Phase 4: Session Management
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### 4.1 Session Framework
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- [ ] Define Session interface
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- [ ] Create SessionManager interface
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- [ ] Implement session creation/validation flow
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- [ ] Build session store interface
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### 4.2 Cookie Sessions
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- [ ] Implement secure cookie creation
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- [ ] Create cookie signing and encryption
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- [ ] Build cookie session validation
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- [ ] Implement cookie refresh mechanism
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### 4.3 JWT Sessions
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- [ ] Implement JWT generation and validation
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- [ ] Create claims mapping system
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- [ ] Build key rotation mechanism
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- [ ] Implement token blacklisting for revocation
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### 4.4 Bearer Token Management
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- [ ] Create token generation and validation
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- [ ] Implement token refresh mechanism
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- [ ] Build token revocation system
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- [ ] Create token metadata storage
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## Phase 5: RBAC Implementation
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### 5.1 RBAC Core
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- [ ] Define Role and Permission models
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- [ ] Create RBACManager interface
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- [ ] Implement permission checking
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- [ ] Build role assignment mechanisms
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### 5.2 Permission Management
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- [ ] Implement permission creation and management
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- [ ] Create permission inheritance system
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- [ ] Build permission checking optimization
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- [ ] Implement permission caching
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### 5.3 Role Management
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- [ ] Create role hierarchy system
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- [ ] Implement role assignment to users
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- [ ] Build role relationship management
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- [ ] Create role-based permission resolution
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### 5.4 Group Management
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- [ ] Implement group creation and management
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- [ ] Create user group assignment
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- [ ] Build group-role relationships
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- [ ] Implement group-based permission resolution
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## Phase 6: Storage Adapters
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### 6.1 Storage Interface
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- [ ] Define comprehensive storage interfaces
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- [ ] Create adapter registration system
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- [ ] Implement transaction support
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- [ ] Build query interface
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### 6.2 In-Memory Storage
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- [ ] Implement in-memory user storage
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- [ ] Create in-memory session storage
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- [ ] Build in-memory RBAC storage
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- [ ] Implement test utilities
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### 6.3 SQL Adapter
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- [ ] Create standard SQL implementation
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- [ ] Implement SQL schema management
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- [ ] Build query optimization
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- [ ] Create connection pooling
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### 6.4 GORM Adapter
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- [ ] Implement GORM models
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- [ ] Create GORM repository implementations
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- [ ] Build efficient query patterns
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- [ ] Implement migration utilities
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### 6.5 Ent Adapter
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- [ ] Create Ent schema definitions
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- [ ] Implement Ent client wrappers
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- [ ] Build repository implementations
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- [ ] Create efficient query builders
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## Phase 7: HTTP Framework Integration
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### 7.1 HTTP Framework Interface
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- [ ] Define middleware interface
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- [ ] Create request parser interface
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- [ ] Implement response writer interface
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- [ ] Build route registration system
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### 7.2 Standard Library Integration
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- [ ] Implement net/http middleware
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- [ ] Create request handlers
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- [ ] Build response utilities
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- [ ] Implement session management
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### 7.3 Framework-Specific Adapters
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- [ ] Implement Chi integration
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- [ ] Create Echo integration
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- [ ] Build Fiber integration
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- [ ] Implement Gin integration
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- [ ] Create Gorilla Mux integration
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- [ ] Build httprouter integration
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- [ ] Implement Huma integration
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- [ ] Create FastHTTP integration
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## Phase 8: Security Features
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### 8.1 Rate Limiting
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- [ ] Implement rate limiter interface
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- [ ] Create in-memory rate limiter
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- [ ] Build distributed rate limiter
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- [ ] Implement rate limit middleware
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### 8.2 Brute Force Protection
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- [ ] Create failed attempt tracking
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- [ ] Implement progressive backoff
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- [ ] Build account locking mechanism
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- [ ] Create notification system
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### 8.3 CSRF Protection
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- [ ] Implement token generation and validation
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- [ ] Create CSRF middleware
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- [ ] Build token storage
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- [ ] Implement SameSite cookie protection
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### 8.4 Password Security
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- [ ] Create password strength validation
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- [ ] Implement password history
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- [ ] Build password rotation policies
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- [ ] Create secure password reset flow
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### 8.5 Account Recovery
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- [ ] Implement secure recovery flow
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- [ ] Create recovery token management
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- [ ] Build multi-channel verification
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- [ ] Implement account recovery audit
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## Phase 9: User Management
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### 9.1 Registration Flow
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- [ ] Implement user registration
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- [ ] Create email verification
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- [ ] Build user activation flow
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- [ ] Implement profile creation
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### 9.2 Profile Management
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- [ ] Create profile update functionality
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- [ ] Implement data validation
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- [ ] Build custom field support
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- [ ] Create profile data encryption
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### 9.3 Account Management
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- [ ] Implement account locking/unlocking
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- [ ] Create password reset flow
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- [ ] Build account deletion
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- [ ] Implement account merging
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## Phase 10: Testing & Documentation
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### 10.1 Unit Testing
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- [ ] Create comprehensive test suite for core components
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- [ ] Implement mock providers
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- [ ] Build test utilities
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- [ ] Create test coverage reports
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### 10.2 Integration Testing
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- [ ] Implement end-to-end authentication flow tests
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- [ ] Create storage adapter tests
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- [ ] Build HTTP integration tests
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- [ ] Implement security feature tests
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### 10.3 Documentation
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- [ ] Create comprehensive API documentation
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- [ ] Build usage examples
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- [ ] Implement godoc-compatible documentation
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- [ ] Create security best practices guide
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### 10.4 Example Applications
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- [ ] Build basic authentication example
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- [ ] Create complete feature showcase
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- [ ] Implement custom provider example
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- [ ] Build framework integration examples
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## Deliverables Timeline
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### Milestone 1: Core Framework (Weeks 1-2)
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- [x] Project setup complete
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- [x] Plugin system architecture implemented
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- [x] Core domain models defined
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- [x] Basic authentication working
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### Milestone 2: Authentication Providers (Weeks 3-4)
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- [ ] OAuth2 framework implemented
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- [ ] All OAuth2 providers working
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- [ ] SAML authentication working
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- [ ] WebAuthn passwordless authentication working
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- [ ] Session management framework complete
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### Milestone 3: MFA & Security (Weeks 5-6)
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- [ ] All MFA methods implemented
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- [ ] Security features working
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- [ ] RBAC implementation complete
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- [ ] User management flows working
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### Milestone 4: Storage & HTTP Integration (Weeks 7-8)
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- [ ] All storage adapters implemented
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- [ ] HTTP framework integration complete
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- [ ] Integration tests passing
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- [ ] Documentation complete
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## Quality Assurance Approach
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### Code Quality
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- [ ] All code must pass linting and formatting checks
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- [ ] Test coverage must exceed 80%
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- [ ] No exported function, type, or variable without documentation
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- [ ] No known security vulnerabilities |