Clean Architecture AuthApi

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Overview • Features • Getting started • Architecture • Technologies

A full-stack authentication and authorization solution demonstrating Clean Architecture principles with .NET 10 and Angular 21. This project showcases multiple authentication methods (JWT Bearer and Basic Authentication), role-based access control, and modern frontend patterns.

Overview

This application demonstrates authentication and authorization patterns using a clean architecture approach. The backend implements dual authentication schemes (JWT Bearer tokens and Basic Authentication) with minimal APIs, while the frontend showcases modern Angular practices with standalone components and signals.

Key capabilities:

• User registration and login with JWT tokens
• Basic Authentication for service-to-service or admin access
• Role-based authorization with custom policies
• Custom claims middleware
• HTTP response caching
• Angular guards and interceptors for client-side auth

Tip

The project uses in-memory Entity Framework for quick setup and testing. Perfect for learning and prototyping!

Features

Authentication Methods

• JWT Bearer Authentication: Secure token-based authentication for user sessions with configurable expiration and validation
• Basic Authentication: HTTP Basic auth scheme for service accounts, admin tools, or simple API access
• Swagger Integration: Pre-configured UI with support for both authentication methods, allowing easy API testing

Application Features

• CQRS Pattern: Command-Query separation without the complexity of MediatR
• Result Pattern: No exceptions for flow control; uses FluentResults for explicit error handling
• Response Caching: HTTP response caching configured via extension methods
• Custom Claims Middleware: Dynamically enriches user claims during request processing
• In-Memory Database: Entity Framework Core InMemory provider for quick setup and testing
• Standalone Components: Modern Angular architecture without NgModules
• Signals: Reactive state management with Angular signals
• JWT Token Management: Automatic token storage and injection via interceptors
• Route Guards: Protect routes based on authentication state
• PrimeNG UI: UI components with PrimeFlex layout utilities

Getting started

Prerequisites

• .NET SDK 10.0+ - Download
• Node.js 20.x or 22.x (LTS versions) - Download
• Angular CLI 21+ - Install via npm install -g @angular/cli
• IDE: Visual Studio, JetBrains Rider, or VS Code

Installation

1. Clone the repository:

   git clone https://github.com/Gramli/AuthApi.git
   cd AuthApi/src

2. Install backend dependencies:

   dotnet restore

3. Install frontend dependencies:

   cd Auth.Frontend
   npm install

Default Credentials

The application automatically seeds a default administrator account on startup:

Default User:

• Username: admin
• Password: admin
• Role: Administrator

You can use these credentials for:

• JWT Bearer Authentication: Login via /api/auth/login to get a token
• Basic Authentication: Direct HTTP Basic auth for API access
• New users can register via /api/auth/register endpoint

Note

Basic Authentication credentials can be configured in appsettings.json under the Authentication:Schemes:Basic section.

Note

JWT Authentication default user credentials can be configured in Auth.Infrastructure.Configuration.UsersConfiguration.cs file.

Running the application

Run both backend and frontend:

1. Start the backend:

   # From the src directory
   dotnet run --project Auth.Api/Auth.Api.csproj

   The API will be available at https://localhost:7190 or http://localhost:5166.

2. Start the frontend (in a new terminal):

   # From the src directory, navigate to Auth.Frontend
   cd Auth.Frontend
   ng serve

   Navigate to http://localhost:4200 in your browser.

Test using Swagger UI:

1. Open your IDE (Visual Studio or Rider) and run the Auth.Api project

2. Navigate to the Swagger UI (automatically opens, or go to /swagger)

3. Authenticate using either method:

   Option 1: JWT Bearer Authentication (Recommended for user sessions)

   • Use the /api/auth/login endpoint with credentials (admin/admin)
   • Click the "Authorize" button and select "Bearer"
   • Enter the token in the format: Bearer <your-token>
   • When to use: User authentication, web/mobile applications, token expiration needed

   Option 2: Basic Authentication (For service-to-service communication)

   • Click the "Authorize" button and select "Basic"
   • Enter credentials (username: admin, password: admin)
   • When to use: Server-to-server calls, admin tools, quick testing without token management

4. Try the protected endpoints with your chosen authentication method

Test using .http files:

1. Navigate to Tests/HttpDebugTests/debug-tests.http
2. The file includes examples with default credentials (admin/admin)
3. Send the Login request to obtain a JWT token
4. Copy the token from the response
5. Use the token in subsequent requests by adding it to the Authorization header:

   Authorization: Bearer <your-token>

   Alternatively, test Basic Authentication by adding:

   Authorization: Basic YWRtaW46YWRtaW4=

   (Base64 encoded admin:admin)

Architecture

This project follows Clean Architecture principles with clear separation of concerns.

Layer Responsibilities:

• Auth.Api: Entry point - endpoints, middleware, configuration, authentication schemes
• Auth.Core: Business logic - use cases, validation, command/query handlers
• Auth.Domain: Domain models - entities, commands, queries, domain rules
• Auth.Infrastructure: External concerns - database, repositories, external services

Design patterns and decisions

CQRS without MediatR: Command-Query separation is achieved through direct handler injection in Minimal APIs. This reduces complexity and abstraction layers while maintaining separation between writes (commands) and reads (queries). Simpler and more maintainable for small-to-medium projects.

Result Pattern: Uses FluentResults instead of exceptions for flow control, providing explicit error handling and better type safety.

Validation: Validot provides declarative, performant validation rules integrated via dependency injection.

Mapping: Mapster handles object-to-object mapping with high performance and low ceremony.

Backend Architecture

• Dual Authentication: JWT Bearer for user sessions, Basic Auth for service-to-service communication
• Authorization Policies: Role-based access control with custom policies
• Response Caching: HTTP response caching for improved performance
• Claims Middleware: Dynamic user claims enrichment
• Database Seeding: Automatic creation of default roles and admin user on startup

Frontend architecture

The Angular frontend is organized into:

• Core: Feature components with specific business logic (login, register, user management)
• Shared: Reusable components, services, guards, and interceptors

JWT Token Flow:

1. User logs in via API
2. JwtTokenService stores token in local storage
3. AuthorizeGuard protects routes by checking token presence
4. authInterceptor automatically adds Authorization header to all HTTP requests

Technologies

Backend:

• ASP.NET Core 10 - Minimal APIs
• Entity Framework Core InMemory - Data persistence
• Mapster - Object mapping
• SmallApiToolkit - API utilities
• FluentResults - Result pattern
• Validot - Validation
• GuardClauses - Defensive programming

Frontend:

• Angular 21 - Framework with standalone components
• PrimeNG - UI component library
• PrimeFlex - CSS utility framework