api-sessions/IMPLEMENTATION_SUMMARY.md

API Sessions - Implementation Summary

✅ Project Successfully Implemented

A complete CRUD REST API with JWT authentication has been successfully implemented and tested.

🎯 Implemented Features

Backend Components

1. Entities

   • ✅ User entity with authentication fields
   • ✅ Product entity for CRUD operations
   • ✅ JPA annotations and automatic timestamps

2. Repositories

   • ✅ UserRepository with custom queries
   • ✅ ProductRepository with search capabilities

3. Security Layer

   • ✅ JWT token generation and validation (JJWT 0.12.6)
   • ✅ JwtRequestFilter for request interception
   • ✅ Spring Security integration
   • ✅ BCrypt password encryption
   • ✅ Stateless session management

4. Services

   • ✅ CustomUserDetailsService for authentication
   • ✅ ProductService with full CRUD operations

5. REST Controllers

   • ✅ AuthController (login, status check)
   • ✅ ProductController (full CRUD + search + filter)

6. Database

   • ✅ H2 in-memory database
   • ✅ Automatic schema generation
   • ✅ Data initialization on startup
   • ✅ 3 users (admin, user, john)
   • ✅ 8 sample products

Testing Infrastructure

1. Test Scripts

   • ✅ test-api.sh - Comprehensive test suite (14 tests)
   • ✅ quick-test.sh - Quick validation script
   • ✅ Colored output for better readability
   • ✅ JSON formatting

2. Documentation

   • ✅ README.md - Complete project documentation
   • ✅ API endpoint documentation
   • ✅ Setup instructions
   • ✅ Usage examples

🧪 Test Results

All 14 tests passed successfully:

Authentication Tests

• ✅ TEST 1: Login and JWT token generation
• ✅ TEST 2: Authentication status check
• ✅ TEST 14: Unauthorized access prevention

READ Operations

• ✅ TEST 3: Get all products
• ✅ TEST 4: Get product by ID
• ✅ TEST 5: Search products by name
• ✅ TEST 6: Filter products by category

CREATE Operations

• ✅ TEST 7: Create new product (Gaming Console PlayStation 5)

UPDATE Operations

• ✅ TEST 8: Update existing product (Laptop Dell XPS 15)
• ✅ TEST 9: Verify product update

DELETE Operations

• ✅ TEST 11: Delete product
• ✅ TEST 12: Verify deletion (404 response)

Data Verification

• ✅ TEST 10: Verify product list after creation
• ✅ TEST 13: Verify final product list after deletion

📊 Initial Data

Users

Username	Password	Role	Email
admin	admin123	ROLE_ADMIN	admin@example.com
user	user123	ROLE_USER	user@example.com
john	john123	ROLE_USER	john@example.com

Products (8 items initialized)

1. Laptop Dell XPS 15 - $1,299.99
2. iPhone 15 Pro - $999.99
3. Wireless Mouse Logitech MX Master 3 - $99.99
4. Mechanical Keyboard - $149.99
5. 27-inch 4K Monitor - $449.99
6. USB-C Hub - $49.99
7. Wireless Headphones Sony WH-1000XM5 - $349.99
8. Webcam Logitech C920 - $79.99

🔧 Technology Stack

• Spring Boot: 4.1.0-M1
• Java: 21
• Spring Security: JWT-based authentication
• JWT Library: JJWT 0.12.6
• Database: H2 (in-memory)
• ORM: Spring Data JPA / Hibernate
• Build Tool: Maven
• Utilities: Lombok

📝 API Endpoints

Authentication

• POST /api/auth/login - User login
• GET /api/auth/status - Check authentication status

Products (All require JWT token)

• GET /api/products - Get all products
• GET /api/products/{id} - Get product by ID
• GET /api/products/search?name={name} - Search products
• GET /api/products/category/{category} - Filter by category
• POST /api/products - Create new product
• PUT /api/products/{id} - Update product
• DELETE /api/products/{id} - Delete product

Console Access

• GET /h2-console - H2 database console (no authentication required)

🚀 How to Run

1. Start the application:

   ./mvnw spring-boot:run
   

2. Run comprehensive tests:

   ./test-api.sh
   

3. Run quick tests:

   ./quick-test.sh
   

4. Access H2 Console:

   • URL: http://localhost:8080/h2-console
   • JDBC URL: jdbc:h2:mem:testdb
   • Username: sa
   • Password: (empty)

🔒 Security Features

• ✅ JWT token-based authentication
• ✅ Stateless session management
• ✅ Password encryption with BCrypt
• ✅ Token validation on each request
• ✅ Protected endpoints (403 without token)
• ✅ Token expiration (24 hours)
• ✅ CSRF protection disabled for REST API

📦 Project Structure

src/main/java/com/manalejandro/api_sessions/
├── config/
│   ├── SecurityConfig.java          # Spring Security configuration
│   └── DataInitializer.java         # Database initialization
├── controller/
│   ├── AuthController.java          # Authentication endpoints
│   └── ProductController.java       # Product CRUD endpoints
├── dto/
│   ├── AuthRequest.java             # Login request DTO
│   ├── AuthResponse.java            # Login response DTO
│   └── ProductDto.java              # Product DTO
├── entity/
│   ├── User.java                    # User entity
│   └── Product.java                 # Product entity
├── repository/
│   ├── UserRepository.java          # User data access
│   └── ProductRepository.java       # Product data access
├── security/
│   ├── JwtTokenUtil.java            # JWT utility functions
│   └── JwtRequestFilter.java        # JWT filter for requests
└── service/
    ├── CustomUserDetailsService.java # User authentication service
    └── ProductService.java           # Product business logic

✨ Key Implementation Highlights

1. JWT Integration with Spring Security

   • JWT tokens are validated and integrated with Spring Security's authentication context
   • Each request with a valid token sets up the SecurityContext
   • Seamless integration between JWT and Spring Security sessions

2. Comprehensive CRUD Operations

   • Full Create, Read, Update, Delete functionality
   • Additional search and filter capabilities
   • Proper HTTP status codes (200, 201, 404, 403)

3. Database Initialization

   • Automatic database setup on application start
   • Pre-populated with test data
   • Password encryption for all users

4. Test Automation

   • Shell scripts for complete API testing
   • Colored output for easy result visualization
   • JSON formatting for readable responses
   • All CRUD operations validated

5. Production-Ready Code

   • Comprehensive documentation
   • Proper error handling
   • Clean code structure
   • Following Spring Boot best practices

🎓 Learning Points

This implementation demonstrates:

• Modern Spring Boot REST API development
• JWT authentication and authorization
• Spring Security configuration
• JPA/Hibernate entity relationships
• Repository pattern
• Service layer architecture
• DTO pattern for data transfer
• Shell script automation
• API testing strategies

📌 Notes

• All code is in English (including comments and documentation)
• The application uses an in-memory H2 database (data resets on restart)
• JWT secret key should be changed for production use
• Token expiration is set to 24 hours
• CORS is not configured (add if needed for frontend integration)

✅ Implementation Complete

The project is fully functional and ready for use. All requirements have been met:

• ✅ Complete CRUD API implementation
• ✅ JWT authentication integrated with Spring Security
• ✅ H2 database with automatic initialization
• ✅ Test scripts with all CRUD operations
• ✅ Comprehensive English documentation
• ✅ All tests passing

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Status: ✅ READY FOR USE Last Updated: 2026-01-23 Version: 1.0.0