project_structure.txt

security    : Spring Security & Security Objects are implemented here.
    jwt:
        AuthEntryPointJwt   : implements AuthenticationEntryPoint
        AuthTokenFilter     : extends OncePerRequestFilter
        JwtUtils            : provides methods for generating, parsing, validating JWT

    services:
        WebSecurityConfig       : extends WebSecurityConfigurerAdapter
        UserDetailsServiceImpl  : implements UserDetailsService
        UserDetailsImpl         : implements UserDetails

controllers : handle signup/login requests & authorized requests.
    AuthController  : @PostMapping(‘/signin’), @PostMapping(‘/signup’)
    TestController  : @GetMapping(‘/api/test/all’), @GetMapping(‘/api/test/[role]’)

repository  : has intefaces that extend Spring Data JPA JpaRepository to interact with PostgreSQL Database.
    UserRepository  : extends JpaRepository<User, Long>
    RoleRepository  : extends JpaRepository<Role, Long>

models      : defines two main models for Authentication (User) & Authorization (Role). They have many-to-many relationship.
    User    : id, username, email, password, roles
    Role    : id, name

payload     : defines classes for Request and Response objects