# TurboTrades Backend - Project Summary

## 🎯 Project Overview

A production-ready backend API for a Steam/CS2/Rust marketplace built with modern Node.js technologies. This backend provides authentication, real-time communication, and a solid foundation for building a complete marketplace platform.

## 🏗️ Architecture

### Tech Stack

- **Framework**: Fastify (high-performance Node.js web framework)
- **Database**: MongoDB with Mongoose ODM
- **Authentication**: 
  - Steam OAuth (passport-steam)
  - JWT (short-lived access tokens + long-lived refresh tokens)
  - httpOnly cookies for CSRF protection
- **Real-time**: WebSocket with custom user mapping
- **Security**: Helmet, CORS, Rate Limiting

### Project Structure

```
TurboTrades/
├── models/                      # MongoDB Schemas
│   └── User.js                 # User model with 2FA, email, ban support
│
├── config/                      # Configuration
│   ├── index.js                # Environment config loader
│   ├── database.js             # MongoDB connection handler
│   └── passport.js             # Steam OAuth configuration
│
├── middleware/                  # Custom Middleware
│   └── auth.js                 # JWT verification & authorization
│
├── routes/                      # API Routes
│   ├── auth.js                 # Authentication endpoints
│   ├── user.js                 # User profile management
│   ├── websocket.js            # WebSocket management
│   └── marketplace.example.js  # Example marketplace routes
│
├── utils/                       # Utilities
│   ├── jwt.js                  # Token generation & verification
│   └── websocket.js            # WebSocket manager with user mapping
│
├── index.js                     # Main server entry point
├── .env.example                 # Environment variables template
├── .gitignore                   # Git ignore rules
├── package.json                 # Dependencies & scripts
├── README.md                    # Full documentation
├── QUICKSTART.md                # Quick start guide
├── WEBSOCKET_GUIDE.md           # WebSocket integration guide
└── test-client.html             # WebSocket test client
```

## ✨ Key Features

### 1. Authentication System

**Steam OAuth Integration**
- Seamless login via Steam
- Automatic user profile creation/update
- Profile syncing (avatar, username, Steam ID)

**JWT Token System**
- Access tokens (15 min lifetime) for API requests
- Refresh tokens (7 days) for token renewal
- Automatic token refresh flow
- httpOnly cookies for security

**Authorization Levels**
- Staff level system (0=User, 1=Support, 2=Mod, 3=Admin)
- Email verification support
- 2FA ready (schema prepared)
- Ban system with expiration dates

### 2. WebSocket System

**Advanced Features**
- User-to-socket mapping for authenticated users
- Public broadcasting (all clients)
- Authenticated-only broadcasting
- Targeted user messaging
- Heartbeat/ping-pong for connection health
- Automatic dead connection cleanup

**Use Cases**
- Real-time price updates
- New listing notifications
- Purchase confirmations
- Trade status updates
- Admin announcements
- User-specific notifications

### 3. User Management

**Profile Features**
- Steam profile data
- Trade URL management
- Email verification system
- Balance tracking
- 2FA support (ready for implementation)
- Ban/unban with reasons
- Intercom integration
- User statistics

### 4. Security Features

**CSRF Protection**
- httpOnly cookies
- SameSite cookie attribute
- Short-lived tokens

**Rate Limiting**
- Per-IP rate limiting
- Configurable limits
- Redis support ready

**Security Headers**
- Helmet.js integration
- Content Security Policy
- XSS protection

**Input Validation**
- Fastify JSON schema validation
- Mongoose schema validation
- Custom validators (email, trade URL)

## 📊 Database Schema

### User Model

```javascript
{
  // Steam Data
  username: String,
  steamId: String,
  avatar: String,
  account_creation: Number,
  communityvisibilitystate: Number,
  
  // Marketplace Data
  tradeUrl: String,
  balance: Number,
  intercom: String,
  
  // Email System
  email: {
    address: String,
    verified: Boolean,
    emailToken: String
  },
  
  // Security
  ban: {
    banned: Boolean,
    reason: String,
    expires: Date  // null = permanent
  },
  
  // 2FA (Ready for implementation)
  twoFactor: {
    enabled: Boolean,
    qrCode: String,
    secret: String,
    revocationCode: String
  },
  
  // Permissions
  staffLevel: Number,  // 0-3
  
  // Timestamps
  createdAt: Date,
  updatedAt: Date
}
```

## 🔌 API Endpoints

### Authentication
- `GET /auth/steam` - Initiate Steam login
- `GET /auth/steam/return` - OAuth callback
- `GET /auth/me` - Get current user
- `POST /auth/refresh` - Refresh tokens
- `POST /auth/logout` - Logout
- `GET /auth/verify` - Verify token

### User Management
- `GET /user/profile` - Get user profile
- `PATCH /user/trade-url` - Update trade URL
- `PATCH /user/email` - Update email
- `GET /user/verify-email/:token` - Verify email
- `GET /user/balance` - Get balance
- `GET /user/stats` - Get statistics
- `PATCH /user/intercom` - Update intercom ID
- `GET /user/:steamId` - Public user profile

### WebSocket
- `GET /ws` - WebSocket connection
- `GET /ws/stats` - Connection statistics
- `POST /ws/broadcast` - Broadcast to all (admin)
- `POST /ws/send/:userId` - Send to user (mod)
- `GET /ws/status/:userId` - Check online status

### System
- `GET /health` - Health check
- `GET /` - API information

## 🚀 Getting Started

### Prerequisites
- Node.js 18+
- MongoDB 5.0+
- Steam API Key

### Quick Start

```bash
# 1. Install dependencies
npm install

# 2. Configure environment
cp .env.example .env
# Edit .env with your settings

# 3. Start MongoDB
mongod

# 4. Start server
npm run dev
```

### Test Connection

```bash
# Health check
curl http://localhost:3000/health

# Login via Steam
open http://localhost:3000/auth/steam

# Test WebSocket
open test-client.html
```

## 📝 Environment Variables

**Required:**
```env
MONGODB_URI=mongodb://localhost:27017/turbotrades
STEAM_API_KEY=your-steam-api-key
SESSION_SECRET=random-secret-here
JWT_ACCESS_SECRET=random-secret-here
JWT_REFRESH_SECRET=different-random-secret
```

**Optional:** (See .env.example for full list)
- Port, host configuration
- Cookie settings
- CORS origins
- Rate limiting
- Email SMTP settings
- WebSocket options

## 🔧 Middleware System

### `authenticate`
Requires valid JWT access token. Returns 401 if missing/invalid.

### `optionalAuthenticate`
Attempts authentication but doesn't fail if no token.

### `requireStaffLevel(level)`
Requires minimum staff level (1=Support, 2=Mod, 3=Admin).

### `requireVerifiedEmail`
Requires verified email address.

### `require2FA`
Requires 2FA to be enabled (ready for implementation).

### `verifyRefreshTokenMiddleware`
Verifies refresh token for token renewal.

## 📡 WebSocket Integration

### Connection
```javascript
const ws = new WebSocket('ws://localhost:3000/ws?token=ACCESS_TOKEN');
```

### Broadcasting (Server-Side)
```javascript
// Broadcast to all
wsManager.broadcastPublic('price_update', { itemId: '123', price: 99 });

// Send to specific user (by Steam ID)
wsManager.sendToUser(steamId, { type: 'notification', data: {...} });

// Authenticated users only
wsManager.broadcastToAuthenticated({ type: 'announcement', data: {...} });
```

### Client Messages
```javascript
// Ping/pong keep-alive
ws.send(JSON.stringify({ type: 'ping' }));
```

## 🎯 Next Steps / TODO

### Immediate
- [ ] Implement email service (nodemailer)
- [ ] Implement 2FA (speakeasy/otplib)
- [ ] Create Item/Listing models
- [ ] Create Transaction models

### Short-term
- [ ] Steam inventory fetching
- [ ] Trade offer automation
- [ ] Payment integration (Stripe/PayPal)
- [ ] Admin dashboard routes
- [ ] Search & filtering system

### Long-term
- [ ] Redis for sessions & rate limiting
- [ ] Docker containerization
- [ ] Automated tests (Jest/Mocha)
- [ ] API documentation (Swagger)
- [ ] Analytics & logging service
- [ ] Multi-server WebSocket sync
- [ ] CDN integration for avatars
- [ ] Backup & disaster recovery

## 📚 Documentation

- **README.md** - Complete documentation
- **QUICKSTART.md** - 5-minute setup guide
- **WEBSOCKET_GUIDE.md** - WebSocket integration guide
- **test-client.html** - Interactive WebSocket tester
- **marketplace.example.js** - Example marketplace implementation

## 🔒 Security Considerations

### Production Checklist
- [ ] Generate secure random secrets
- [ ] Enable HTTPS/WSS
- [ ] Set `COOKIE_SECURE=true`
- [ ] Configure proper CORS origins
- [ ] Enable rate limiting with Redis
- [ ] Set up monitoring & logging
- [ ] Configure MongoDB authentication
- [ ] Use environment-specific configs
- [ ] Enable production error handling
- [ ] Set up automated backups

## 🚀 Deployment

### Recommended Stack
- **Hosting**: DigitalOcean, AWS, Heroku
- **Process Manager**: PM2
- **Reverse Proxy**: Nginx
- **Database**: MongoDB Atlas
- **SSL**: Let's Encrypt
- **Monitoring**: PM2 Monitoring, New Relic, DataDog

### PM2 Quick Start
```bash
npm install -g pm2
pm2 start index.js --name turbotrades
pm2 save
pm2 startup
```

## 📈 Performance

### Optimizations Included
- Fastify (3x faster than Express)
- Connection pooling for MongoDB
- WebSocket heartbeat for dead connection cleanup
- Rate limiting to prevent abuse
- Efficient JWT verification
- Indexed database queries (via schema)

### Scalability Considerations
- Stateless JWT authentication (horizontal scaling ready)
- WebSocket manager can be extended with Redis pub/sub
- MongoDB connection pooling
- Rate limiter ready for Redis backend
- Microservices-ready architecture

## 🤝 Contributing

### Code Style
- ES6+ modules
- Async/await over callbacks
- Descriptive variable names
- Comments for complex logic
- Error handling on all async operations

### Git Workflow
1. Create feature branch
2. Make changes
3. Test thoroughly
4. Submit pull request

## 📄 License

ISC License

## 🆘 Support & Resources

- **Fastify Docs**: https://www.fastify.io/docs/latest/
- **Mongoose Docs**: https://mongoosejs.com/docs/
- **Steam Web API**: https://developer.valvesoftware.com/wiki/Steam_Web_API
- **JWT.io**: https://jwt.io/
- **WebSocket API**: https://developer.mozilla.org/en-US/docs/Web/API/WebSocket

## 🎉 Credits

Built with modern Node.js best practices, focusing on:
- Security first
- Developer experience
- Production readiness
- Scalability
- Maintainability

---

**Ready to build your marketplace! 🚀**

For questions or issues, check the documentation or create an issue on GitHub.