A fully-featured Go API system with OAuth 2.0, modular architecture, and comprehensive modules for a complete backend solution.

• Modular Monolith Architecture: Clean separation of concerns with module-based structure
• PostgreSQL 16: Primary data store with connection pooling
• Redis 7 + Sentinel: Caching and session management with high availability
• NATS JetStream: Async message queue for notifications
• Comprehensive Middleware: Logging, CORS, rate limiting, error handling, request ID tracking

• Authorization Code Flow with PKCE
• Client Credentials Flow
• Refresh Token Flow
• Token Revocation
• Token Introspection
• JWT-based access tokens

• Users: Registration, login, profile management, anonymization
• API Clients: Admin-managed OAuth client applications
• Audit Logs: Immutable audit trail for all actions
• Notifications: Email (SendGrid) and SMS (Twilio) via NATS queue
• Settings: System and user-level configuration
• Storage: File upload/download (local or S3)
• Reviews: User reviews with admin moderation
• Support: Ticket system with admin replies
• Dashboard: Role-based analytics
• Analytics: GA4 server-side event tracking
• Team Members: Team directory with visibility controls
• PDF Generator: Generate invoices and reports

gogin/
├── cmd/
│   ├── api/              # Main API server
│   └── worker/           # Background worker
├── internal/
│   ├── config/           # Configuration management
│   ├── clients/          # Database, Redis, NATS clients
│   ├── middleware/       # HTTP middleware
│   ├── models/           # Database models
│   ├── response/         # Standard response wrapper
│   └── modules/          # Business logic modules
│       ├── core/         # Health & status endpoints
│       ├── oauth2/       # OAuth2 server
│       ├── users/        # User management
│       ├── apiclient/    # API client management
│       ├── logs/         # Audit logging
│       ├── notifications/ # Notification system
│       ├── settings/     # Settings management
│       ├── storage/      # File storage
│       ├── reviews/      # Review system
│       ├── support/      # Support tickets
│       ├── dashboard/    # Analytics dashboard
│       ├── analytics/    # GA4 tracking
│       ├── team/         # Team directory
│       ├── sendgrid/     # SendGrid wrapper
│       ├── twilio/       # Twilio wrapper
│       ├── pdf/          # PDF generation
│       └── redishelper/  # Redis utilities
├── migrations/           # Database migrations
├── docs/                # API documentation
├── scripts/             # Build scripts
├── .env.example         # Example environment variables
└── go.mod              # Go modules

• Go 1.21 or higher
• PostgreSQL 16
• Redis 7
• NATS Server with JetStream

1. Clone the repository

   cd /Applications/MAMP/htdocs/gogin

2. Install dependencies

   go mod tidy

3. Configure environment

   cp .env.example .env
   # Edit .env with your configuration

4. Set up database

   # Create database
   createdb goapi
   
   # Run migrations
   psql -U postgres -d goapi -f migrations/001_create_users_table.sql
   psql -U postgres -d goapi -f migrations/002_create_oauth_tables.sql
   psql -U postgres -d goapi -f migrations/003_create_audit_logs_table.sql
   psql -U postgres -d goapi -f migrations/004_create_notifications_table.sql
   psql -U postgres -d goapi -f migrations/005_create_settings_table.sql
   psql -U postgres -d goapi -f migrations/006_create_files_table.sql
   psql -U postgres -d goapi -f migrations/007_create_reviews_table.sql
   psql -U postgres -d goapi -f migrations/008_create_support_tickets_table.sql
   psql -U postgres -d goapi -f migrations/009_create_team_members_table.sql

5. Run the server

   go run cmd/api/main.go

The server will start on http://localhost:8080 (or your configured port).

• GET / - Root endpoint
• GET /api/v1/health - Health check
• GET /api/v1/status - Detailed system status

All API responses follow this standard format:

{
  "success": true,
  "message": "Success message",
  "data": {},
  "meta": {
    "timestamp": "2025-01-15T10:30:00Z",
    "request_id": "uuid",
    "version": "v1",
    "actor": {
      "user_id": "uuid",
      "client_id": "client_id",
      "role": "user"
    }
  },
  "errors": []
}

Key configuration options in .env:

• App: Name, environment, port, version
• Database: PostgreSQL connection settings
• Redis: Redis/Sentinel configuration
• NATS: JetStream connection
• OAuth: Token expiry, JWT secret
• SendGrid: Email service
• Twilio: SMS service
• Storage: Local or S3 storage
• GA4: Analytics tracking

1. Create module directory: internal/modules/mymodule/
2. Create module.go with route registration
3. Create handlers.go with HTTP handlers
4. Create service.go with business logic
5. Register in main.go

go test ./...

go build -o bin/api cmd/api/main.go

• JWT-based authentication
• OAuth 2.0 with PKCE
• Rate limiting per IP/user
• CORS protection
• Request ID tracking
• Comprehensive audit logging
• Password hashing (bcrypt)
• Token revocation support

• Health check endpoint: /api/v1/health
• Status endpoint: /api/v1/status
• Audit logs in database
• Colored console logging

• Complete OAuth2 implementation
• Implement all module endpoints
• Add Swagger/OpenAPI documentation
• Write comprehensive tests
• Add CI/CD pipeline
• Docker containerization

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