Roadmap:

1. Environment Setup

   • Install Swift and Vapor
   • Set up a new Vapor project

2. Database Integration

   • Choose a database (e.g., PostgreSQL, MySQL)
   • Integrate chosen database with Vapor
   • Define user model and migration

3. User Registration & Authentication

   • Create endpoints for user registration
   • Implement password hashing and storage
   • Create endpoints for user login
   • Implement JWT (JSON Web Tokens) for user authentication

4. OAuth Integration (Optional, but common in services like Auth0)

   • Integrate OAuth providers (like Google, Facebook, etc.)
   • Create endpoints to handle OAuth authentication and callbacks

5. User Management

   • Implement endpoints for user profile updates, password changes, and account deletion

6. Multi-factor Authentication (Optional, but enhances security)

   • Integrate an SMS or email provider for sending verification codes
   • Create endpoints to handle MFA setup and verification

7. Rate Limiting & Security Measures

   • Implement rate limiting to prevent abuse
   • Add other security measures (e.g., checking for suspicious activities, IP-based bans)

8. API Documentation & Testing

   • Write documentation for your API
   • Write tests for your endpoints

9. Deployment & Scaling

   • Choose a hosting provider
   • Deploy your application
   • Consider load balancing and other scaling strategies

10. Maintenance & Monitoring

    • Set up monitoring tools to track usage and catch errors
    • Regularly update dependencies and check for security vulnerabilities