This pull request introduces a complete authentication module for the application, implementing user registration and login with domain-driven design principles. It covers the API layer, application layer (use cases and DTOs), domain models, infrastructure for persistence and security, and includes tests for authentication logic.

API Layer:

• Adds AuthController with endpoints for user registration (/register, /signup) and login (/login, /signin), delegating logic to use cases.

Application Layer:

• Defines DTOs for authentication and user creation (AuthUserRequest, CreateUserRequest, CreateUserResponse). [1] [2] [3]
• Implements use cases for user authentication and registration, including validation and error handling. [1] [2]
• Introduces a PasswordHasher interface for password security.
• Provides Spring configuration for use case beans.

Domain Layer:

• Adds the User aggregate root with factory methods, status management, and validation.
• Defines UserRole and UserStatus enums. [1] [2]
• Specifies the UserRepository interface.

Infrastructure Layer:

• Implements JPA entity (UserEntity) and repository (UserJpaRepository, UserRepositoryImpl) for user persistence. [1] [2] [3]
• Provides a mapper between domain model and entity (UserMapper).
• Implements BCryptPasswordHasher for secure password hashing.

Testing:

• Adds unit tests for the authentication use case, covering success and failure scenarios.

Most important changes:

API and Application Layer

• Introduced AuthController with endpoints for registration and login, delegating to use cases.
• Implemented AuthenticateUserUseCase and RegisterUserUseCase for authentication and user creation, including validation and error handling. [1] [2]
• Defined DTOs for user authentication and registration flows. [1] [2] [3]
• Added PasswordHasher abstraction and its Spring configuration. [1] [2]

Domain and Infrastructure Layer

• Created the User domain model with status management, and supporting enums (UserRole, UserStatus). [1] [2] [3]
• Implemented persistence with JPA entity, repository, and domain-entity mapper. [1] [2] [3] [4]
• Provided a secure password hasher implementation using BCrypt.

Testing

• Added comprehensive unit tests for the authentication use case.