feat(backend): Implement Refresh Token mechanism (Day 5 Phase 1)
Implemented secure refresh token rotation with the following features: - RefreshToken domain entity with IsExpired(), IsRevoked(), IsActive(), Revoke() methods - IRefreshTokenService with token generation, rotation, and revocation - RefreshTokenService with SHA-256 hashing and token family tracking - RefreshTokenRepository for database operations - Database migration for refresh_tokens table with proper indexes - Updated LoginCommandHandler and RegisterTenantCommandHandler to return refresh tokens - Added POST /api/auth/refresh endpoint (token rotation) - Added POST /api/auth/logout endpoint (revoke single token) - Added POST /api/auth/logout-all endpoint (revoke all user tokens) - Updated JWT access token expiration to 15 minutes (from 60) - Refresh token expiration set to 7 days - Security features: token reuse detection, IP address tracking, user-agent logging Changes: - Domain: RefreshToken.cs, IRefreshTokenRepository.cs - Application: IRefreshTokenService.cs, updated LoginResponseDto and RegisterTenantResult - Infrastructure: RefreshTokenService.cs, RefreshTokenRepository.cs, RefreshTokenConfiguration.cs - API: AuthController.cs (3 new endpoints), RefreshTokenRequest.cs, LogoutRequest.cs - Configuration: appsettings.Development.json (updated JWT settings) - DI: DependencyInjection.cs (registered new services) - Migration: AddRefreshTokens migration 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Yaojia Wang
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colaflow-api/DAY4-IMPLEMENTATION-SUMMARY.md
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colaflow-api/DAY4-IMPLEMENTATION-SUMMARY.md
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# Day 4 Implementation Summary: JWT Service + Password Hashing + Authentication Middleware
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## Date: 2025-11-03
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---
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## Overview
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Successfully implemented **Day 4** objectives:
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- ✅ JWT Token Generation Service
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- ✅ BCrypt Password Hashing Service
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- ✅ Real JWT Authentication Middleware
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- ✅ Protected Endpoints with [Authorize]
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- ✅ Replaced all dummy tokens with real JWT
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- ✅ Compilation Successful
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---
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## Files Created
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### 1. Application Layer Interfaces
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**`src/Modules/Identity/ColaFlow.Modules.Identity.Application/Services/IJwtService.cs`**
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```csharp
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public interface IJwtService
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{
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string GenerateToken(User user, Tenant tenant);
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Task<string> GenerateRefreshTokenAsync(User user, CancellationToken cancellationToken = default);
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}
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```
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**`src/Modules/Identity/ColaFlow.Modules.Identity.Application/Services/IPasswordHasher.cs`**
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```csharp
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public interface IPasswordHasher
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{
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string HashPassword(string password);
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bool VerifyPassword(string password, string hashedPassword);
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}
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```
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### 2. Infrastructure Layer Implementations
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**`src/Modules/Identity/ColaFlow.Modules.Identity.Infrastructure/Services/JwtService.cs`**
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- Uses `System.IdentityModel.Tokens.Jwt`
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- Generates JWT with tenant and user claims
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- Configurable via appsettings (Issuer, Audience, SecretKey, Expiration)
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- Token includes: user_id, tenant_id, tenant_slug, email, full_name, auth_provider, role
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**`src/Modules/Identity/ColaFlow.Modules.Identity.Infrastructure/Services/PasswordHasher.cs`**
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- Uses `BCrypt.Net-Next`
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- Work factor: 12 (balance between security and performance)
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- HashPassword() - hashes plain text passwords
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- VerifyPassword() - verifies password against hash
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---
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## Files Modified
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### 1. Dependency Injection
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**`src/Modules/Identity/ColaFlow.Modules.Identity.Infrastructure/DependencyInjection.cs`**
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```csharp
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// Added services
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services.AddScoped<IJwtService, JwtService>();
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services.AddScoped<IPasswordHasher, PasswordHasher>();
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```
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### 2. Command Handlers
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**`src/Modules/Identity/ColaFlow.Modules.Identity.Application/Commands/RegisterTenant/RegisterTenantCommandHandler.cs`**
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- Removed dummy token generation
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- Now uses `IPasswordHasher` to hash admin password
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- Now uses `IJwtService` to generate real JWT token
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**`src/Modules/Identity/ColaFlow.Modules.Identity.Application/Commands/Login/LoginCommandHandler.cs`**
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- Removed dummy token generation
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- Now uses `IPasswordHasher.VerifyPassword()` to validate password
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- Now uses `IJwtService.GenerateToken()` to generate real JWT token
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### 3. API Configuration
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**`src/ColaFlow.API/Program.cs`**
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- Added JWT Bearer authentication configuration
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- Added authentication and authorization middleware
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- Token validation parameters: ValidateIssuer, ValidateAudience, ValidateLifetime, ValidateIssuerSigningKey
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**`src/ColaFlow.API/appsettings.Development.json`**
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```json
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{
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"Jwt": {
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"SecretKey": "your-super-secret-key-min-32-characters-long-12345",
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"Issuer": "ColaFlow.API",
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"Audience": "ColaFlow.Web",
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"ExpirationMinutes": "60"
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}
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}
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```
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**`src/ColaFlow.API/Controllers/AuthController.cs`**
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- Added `[Authorize]` attribute to `/api/auth/me` endpoint
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- Endpoint now extracts and returns JWT claims (user_id, tenant_id, email, etc.)
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---
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## NuGet Packages Added
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| Package | Version | Project | Purpose |
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|---------|---------|---------|---------|
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| Microsoft.IdentityModel.Tokens | 8.14.0 | Identity.Infrastructure | JWT token validation |
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| System.IdentityModel.Tokens.Jwt | 8.14.0 | Identity.Infrastructure | JWT token generation |
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| BCrypt.Net-Next | 4.0.3 | Identity.Infrastructure | Password hashing |
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| Microsoft.AspNetCore.Authentication.JwtBearer | 9.0.10 | ColaFlow.API | JWT bearer authentication |
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---
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## JWT Claims Structure
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Tokens include the following claims:
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```json
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{
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"sub": "user-guid",
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"email": "user@example.com",
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"jti": "unique-token-id",
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"user_id": "user-guid",
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"tenant_id": "tenant-guid",
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"tenant_slug": "tenant-slug",
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"tenant_plan": "Professional",
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"full_name": "User Full Name",
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"auth_provider": "Local",
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"role": "User",
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"iss": "ColaFlow.API",
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"aud": "ColaFlow.Web",
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"exp": 1762125000
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}
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```
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---
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## Security Features Implemented
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1. **Password Hashing**: BCrypt with work factor 12
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- Passwords are never stored in plain text
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- Salted hashing prevents rainbow table attacks
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2. **JWT Token Security**:
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- HMAC SHA-256 signing algorithm
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- 60-minute token expiration (configurable)
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- Secret key validation (min 32 characters)
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- Issuer and Audience validation
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3. **Authentication Middleware**:
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- Validates token signature
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- Validates token expiration
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- Validates issuer and audience
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- Rejects requests without valid tokens to protected endpoints
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---
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## Testing Instructions
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### Prerequisites
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1. Ensure PostgreSQL is running
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2. Database migrations are up to date: `dotnet ef database update --context IdentityDbContext`
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### Manual Testing
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#### Step 1: Start the API
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```bash
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cd c:\Users\yaoji\git\ColaCoder\product-master\colaflow-api
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dotnet run --project src/ColaFlow.API
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```
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#### Step 2: Register a Tenant
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```powershell
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$body = @{
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tenantName = "Test Corp"
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tenantSlug = "test-corp"
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subscriptionPlan = "Professional"
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adminEmail = "admin@testcorp.com"
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adminPassword = "Admin@1234"
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adminFullName = "Test Admin"
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} | ConvertTo-Json
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$response = Invoke-RestMethod -Uri "http://localhost:5167/api/tenants/register" `
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-Method Post `
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-ContentType "application/json" `
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-Body $body
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$token = $response.accessToken
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Write-Host "Token: $token"
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```
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**Expected Result**: Returns JWT token (long base64 string)
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#### Step 3: Login with Correct Password
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```powershell
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$loginBody = @{
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tenantSlug = "test-corp"
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email = "admin@testcorp.com"
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password = "Admin@1234"
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} | ConvertTo-Json
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$loginResponse = Invoke-RestMethod -Uri "http://localhost:5167/api/auth/login" `
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-Method Post `
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-ContentType "application/json" `
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-Body $loginBody
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Write-Host "Login Token: $($loginResponse.accessToken)"
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```
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**Expected Result**: Returns JWT token
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#### Step 4: Login with Wrong Password
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```powershell
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$wrongPasswordBody = @{
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tenantSlug = "test-corp"
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email = "admin@testcorp.com"
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password = "WrongPassword"
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} | ConvertTo-Json
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try {
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Invoke-RestMethod -Uri "http://localhost:5167/api/auth/login" `
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-Method Post `
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-ContentType "application/json" `
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-Body $wrongPasswordBody
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} catch {
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Write-Host "Correctly rejected: $($_.Exception.Response.StatusCode)"
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}
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```
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**Expected Result**: 401 Unauthorized
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#### Step 5: Access Protected Endpoint WITHOUT Token
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```powershell
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try {
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Invoke-RestMethod -Uri "http://localhost:5167/api/auth/me" -Method Get
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} catch {
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Write-Host "Correctly rejected: $($_.Exception.Response.StatusCode)"
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}
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```
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**Expected Result**: 401 Unauthorized
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#### Step 6: Access Protected Endpoint WITH Token
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```powershell
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$headers = @{
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"Authorization" = "Bearer $token"
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}
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$meResponse = Invoke-RestMethod -Uri "http://localhost:5167/api/auth/me" `
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-Method Get `
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-Headers $headers
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$meResponse | ConvertTo-Json
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```
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**Expected Result**: Returns user claims
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```json
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{
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"userId": "...",
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"tenantId": "...",
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"email": "admin@testcorp.com",
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"fullName": "Test Admin",
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"tenantSlug": "test-corp",
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"claims": [...]
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}
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```
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---
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## Automated Test Script
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A PowerShell test script is available:
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```bash
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powershell -ExecutionPolicy Bypass -File test-auth-simple.ps1
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```
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---
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## Build Status
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✅ **Compilation**: Successful
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✅ **Warnings**: Minor (async method without await, EF Core version conflicts)
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✅ **Errors**: None
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```
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Build succeeded.
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20 Warning(s)
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0 Error(s)
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```
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---
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## Next Steps (Day 5)
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Based on the original 10-day plan:
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1. **Refresh Token Implementation**
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- Implement `GenerateRefreshTokenAsync()` in JwtService
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- Add refresh token storage (Database or Redis)
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- Add `/api/auth/refresh` endpoint
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2. **Role-Based Authorization**
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- Implement real role system (Admin, Member, Guest)
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- Add role claims to JWT
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- Add `[Authorize(Roles = "Admin")]` attributes
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3. **Email Verification**
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- Email verification flow
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- Update `User.EmailVerifiedAt` on verification
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4. **SSO Integration** (if time permits)
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- OAuth 2.0 / OpenID Connect support
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- Azure AD / Google / GitHub providers
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---
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## Configuration Recommendations
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### Production Configuration
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**Never use the default secret key in production!** Generate a strong secret:
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```powershell
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# Generate a 64-character random secret
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$bytes = New-Object byte[] 64
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[Security.Cryptography.RNGCryptoServiceProvider]::Create().GetBytes($bytes)
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$secret = [Convert]::ToBase64String($bytes)
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Write-Host $secret
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```
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Update `appsettings.Production.json`:
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```json
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{
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"Jwt": {
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"SecretKey": "<generated-strong-secret-key>",
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"Issuer": "ColaFlow.API",
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"Audience": "ColaFlow.Web",
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"ExpirationMinutes": "30"
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}
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}
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```
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### Security Best Practices
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1. **Secret Key**: Use environment variables for production
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2. **Token Expiration**: Shorter tokens (15-30 min) + refresh tokens
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3. **HTTPS**: Always use HTTPS in production
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4. **Password Policy**: Enforce strong password requirements (min length, complexity)
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5. **Rate Limiting**: Add rate limiting to auth endpoints
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6. **Audit Logging**: Log all authentication attempts
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---
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## Troubleshooting
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### Issue: "JWT SecretKey not configured"
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**Solution**: Ensure `appsettings.Development.json` contains `Jwt:SecretKey`
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### Issue: Token validation fails
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**Solution**: Check Issuer and Audience match between token generation and validation
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### Issue: "Invalid credentials" even with correct password
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**Solution**:
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- Check if password was hashed during registration
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- Verify `PasswordHash` column in database is not null
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- Re-register tenant to re-hash password
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---
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## Summary
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Day 4 successfully implemented **real authentication security**:
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- ✅ BCrypt password hashing (no plain text passwords)
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- ✅ JWT token generation with proper claims
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- ✅ JWT authentication middleware
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- ✅ Protected endpoints with [Authorize]
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- ✅ Token validation (signature, expiration, issuer, audience)
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The authentication system is now production-ready (with appropriate configuration changes).
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---
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**Implementation Time**: ~3 hours
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**Files Created**: 2 interfaces, 2 implementations, 1 test script
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**Files Modified**: 6 files (handlers, DI, Program.cs, AuthController, appsettings)
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**Packages Added**: 4 NuGet packages
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