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Tutorial: Building a Spring Security and JWT Application

Step 1: Setting up the Project

1. Start by creating a new Spring Boot project.
2. Add the necessary dependencies for Spring Security and JWT in your pom.xml file.
3. Create an application.properties file and configure your database settings.
4. Run the application to ensure it starts successfully.

Step 2: Creating DTO Classes

1. Create a DTO class to handle request and response data.
2. Annotate the class with @Data and @JsonIgnoreProperties.
3. Define the necessary fields such as name, email, role, and password.

Step 3: Implementing User Entity

1. Create a User entity class with fields like id, email, password, and role.
2. Annotate the class with @Entity and define the table name.
3. Implement the necessary getters and setters.

Step 4: Creating Repositories

1. Create repositories for User and Product entities by extending JpaRepository.
2. Define methods like findByEmail in the UserRepository.

Step 5: Generating JWT Token

1. Create a JwtUtil class to generate JWT tokens with methods for token creation and validation.
2. Define a secret key and set the token expiration time.

Step 6: Implementing UserDetailsService

1. Create a UserDetailsServiceImpl class to load user details by email.
2. Implement the loadUserByUsername method to fetch user details from the database.

Step 7: Configuring Spring Security

1. Create a SecurityConfig class to configure security settings.
2. Define security rules for different endpoints based on user roles.
3. Configure authentication providers and password encoders.

Step 8: Implementing User Services

1. Create a UserService class to handle user signup, signin, and token refresh operations.
2. Implement methods to save users, authenticate users, and refresh tokens.

Step 9: Creating Controllers

1. Create controllers for user and admin functionalities.
2. Implement endpoints for user signup, signin, product management, and token refresh.

Step 10: Testing the Application

1. Run the application and check if it starts successfully.
2. Test the endpoints by signing up as an admin and a user.
3. Use tokens to access different endpoints based on user roles.
4. Verify if token refresh functionality is working for both admin and user roles.

Step 11: Finalizing and Deployment

1. Ensure all functionalities work as expected.
2. Test the application thoroughly to validate user authentication and authorization.
3. Deploy the application to your preferred server for production use.

By following these steps, you can successfully build a Spring Security and JWT application that handles user authentication, authorization, and role-based access control.