# Authentication Implementation Summary

## Completed Components

### 1. AuthService (/src/server/auth/services/AuthService.ts)
**High-level authentication orchestration service**

✅ **register(username, email, password, ipAddress?, userAgent?)**
- Validates username (3-32 chars, alphanumeric + underscore)
- Validates email format
- Validates password strength (8+ chars, uppercase, lowercase, number)
- Checks for duplicate email/username
- Hashes password with bcrypt
- Generates unique Linux username (sanitized, lowercase, unique)
- Creates user in database
- Logs USER_REGISTERED audit event

✅ **login(email, password, ipAddress?, userAgent?)**
- Finds user by email
- Checks account lockout status (5 failed attempts = 15 min lockout)
- Verifies password
- Increments failed attempts on failure
- Resets failed attempts on success
- Updates last login timestamp
- Creates session with token hash
- Generates JWT token (RS256, 7 day expiry)
- Logs USER_LOGIN or LOGIN_FAILED audit event

✅ **logout(sessionId, userId)**
- Revokes session in database
- Logs USER_LOGOUT audit event

✅ **verifyToken(token)**
- Verifies JWT signature and expiry
- Hashes token to find session
- Checks session not expired or revoked
- Finds and validates user (active status)
- Returns user and session objects

### 2. authMiddleware (/src/server/auth/middleware/authMiddleware.ts)
**Hono middleware for authentication**

✅ **Token Extraction**
- Supports `Authorization: Bearer <token>` header
- Supports `auth_token` httpOnly cookie
- Returns 401 if no token found

✅ **Token Verification**
- Calls AuthService.verifyToken()
- Handles all error types (AuthError, DatabaseError)
- Uses Effect.runPromise with AppLayer

✅ **Context Injection**
- Injects `user` into Hono context (c.set('user', user))
- Injects `session` into Hono context (c.set('session', session))
- TypeScript declaration extends ContextVariableMap

✅ **Error Handling**
- AuthError → 401 Unauthorized
- DatabaseError → 500 Internal Server Error
- Unknown errors → 500 Internal Server Error

### 3. authRoutes (/src/server/auth/routes/authRoutes.ts)
**Hono router with authentication endpoints**

✅ **POST /api/auth/register**
- Validates required fields (username, email, password)
- Extracts IP address (x-forwarded-for, x-real-ip headers)
- Extracts user agent
- Calls AuthService.register()
- Returns user object (201 Created)
- Error handling: ValidationError → 400, AuthError → 400, DatabaseError → 500

✅ **POST /api/auth/login**
- Validates required fields (email, password)
- Extracts IP address and user agent
- Calls AuthService.login()
- Sets httpOnly cookie with token
- Returns user object + token (200 OK)
- Error handling: AuthError → 401, DatabaseError → 500

✅ **POST /api/auth/logout** (protected)
- Requires authMiddleware
- Gets user and session from context
- Calls AuthService.logout()
- Clears auth_token cookie
- Returns success message (200 OK)
- Error handling: DatabaseError → 500

✅ **GET /api/auth/me** (protected)
- Requires authMiddleware
- Gets user from context
- Returns user profile data
- Includes: id, username, email, emailVerified, createdAt, lastLoginAt
- Error handling: Generic 500 for unexpected errors

### 4. AuthController (/src/server/auth/controllers/AuthController.ts)
**Optional Effect-TS controller for clean architecture**

✅ **register(data, ipAddress?, userAgent?)**
- Wraps AuthService.register()
- Returns formatted user object
- Effect-TS service pattern

✅ **login(data, ipAddress?, userAgent?)**
- Wraps AuthService.login()
- Returns formatted response with user + token
- Effect-TS service pattern

✅ **logout(sessionId, userId)**
- Wraps AuthService.logout()
- Effect-TS service pattern

✅ **me(user)**
- Returns formatted user profile
- Synchronous Effect.succeed
- Effect-TS service pattern

### 5. AppLayer (middleware/authMiddleware.ts)
**Complete dependency layer composition**

✅ **Layer Structure**
```typescript
Layer.mergeAll(
  DatabaseService.Live,
  PasswordService.Live,
  TokenService.Live
).pipe(
  Layer.provideMerge(UserRepository.Live),
  Layer.provideMerge(SessionRepository.Live),
  Layer.provideMerge(AuditLogService.Live),
  Layer.provideMerge(AuthService.Live)
)
```

### 6. Supporting Files

✅ **/src/server/auth/index.ts**
- Barrel export for all auth modules
- Clean public API

✅ **/src/server/auth/README.md**
- Comprehensive documentation
- Architecture overview
- Security features
- Usage examples
- API reference
- Testing guide

✅ **/src/server/auth/example-usage.ts**
- Complete Hono integration example
- Protected route examples
- Admin route example
- curl command examples
- Setup instructions

## Security Features Implemented

### Password Security
✅ Minimum 8 characters
✅ Uppercase + lowercase + number requirements
✅ bcrypt hashing (12 rounds)
✅ Password strength validation

### Account Lockout
✅ 5 failed attempts trigger
✅ 15 minute lockout duration
✅ Automatic unlock after duration
✅ Failed attempts reset on success

### Session Management
✅ JWT with RS256 signing
✅ 7 day token expiration
✅ Session stored with SHA-256 token hash
✅ Session validation on every request
✅ Revocable sessions

### Cookie Security
✅ httpOnly flag
✅ secure flag (production only)
✅ sameSite=strict
✅ 7 day maxAge
✅ path=/

### Linux Username Generation
✅ Sanitized from username
✅ Lowercase alphanumeric + underscores
✅ Must start with letter
✅ Max 32 characters
✅ Guaranteed uniqueness with counter suffix

### Audit Logging
✅ USER_REGISTERED events
✅ USER_LOGIN events
✅ USER_LOGOUT events
✅ LOGIN_FAILED events
✅ IP address tracking
✅ User agent tracking

## Effect-TS Patterns Used

### Context.Tag Pattern
✅ All services extend Context.Tag
✅ Type-safe dependency injection
✅ Service interface definitions

### Layer Pattern
✅ All services provide Layer.Live
✅ Layer composition with provideMerge
✅ Complete dependency graph

### Effect.gen Pattern
✅ All async operations use Effect.gen
✅ yield* for Effect composition
✅ Type-safe error handling

### Typed Errors
✅ AuthError for authentication failures
✅ ValidationError for input validation
✅ DatabaseError for persistence failures
✅ No `as` type casting used

## Integration Points

### Hono Framework
✅ Hono router for routes
✅ Hono middleware pattern
✅ Context variable injection
✅ Cookie utilities (getCookie, setCookie)

### Effect Runtime
✅ Effect.runPromise for HTTP handlers
✅ Effect.provide with AppLayer
✅ Proper error handling in async context

### Database
✅ DatabaseService dependency
✅ UserRepository for user operations
✅ SessionRepository for session operations
✅ AuditLogService for logging

## Files Created

1. `/src/server/auth/services/AuthService.ts` - Main auth orchestration
2. `/src/server/auth/middleware/authMiddleware.ts` - Hono middleware
3. `/src/server/auth/routes/authRoutes.ts` - HTTP routes
4. `/src/server/auth/controllers/AuthController.ts` - Optional controller
5. `/src/server/auth/index.ts` - Barrel exports
6. `/src/server/auth/README.md` - Documentation
7. `/src/server/auth/example-usage.ts` - Usage examples
8. `/src/server/auth/IMPLEMENTATION_SUMMARY.md` - This file

## Testing Checklist

- [ ] Test user registration with valid data
- [ ] Test registration with duplicate email
- [ ] Test registration with duplicate username
- [ ] Test registration with weak password
- [ ] Test registration with invalid email
- [ ] Test login with correct credentials
- [ ] Test login with wrong password
- [ ] Test account lockout after 5 failed attempts
- [ ] Test lockout expiry after 15 minutes
- [ ] Test successful login resets failed attempts
- [ ] Test logout revokes session
- [ ] Test protected route with valid token
- [ ] Test protected route with expired token
- [ ] Test protected route with revoked session
- [ ] Test protected route with no token
- [ ] Test token from Authorization header
- [ ] Test token from cookie
- [ ] Test Linux username generation
- [ ] Test Linux username uniqueness
- [ ] Test audit log entries

## Next Steps

1. **Write Tests**: Create comprehensive test suite using vitest
2. **Environment Variables**: Add JWT secret configuration (optional, currently using generated keys)
3. **Rate Limiting**: Add rate limiting middleware for login endpoint
4. **Email Verification**: Implement email verification flow
5. **Password Reset**: Add password reset functionality
6. **OAuth Integration**: Add OAuth2 providers (Google, GitHub, Microsoft)
7. **Two-Factor Auth**: Implement TOTP-based 2FA
8. **Session Management UI**: Add user session management endpoints
9. **Admin API**: Add admin endpoints for user management
10. **Monitoring**: Add Prometheus metrics for auth operations