source: src/main/java/mk/ukim/finki/wp/db/service/CustomUserDetailsService.java

package mk.ukim.finki.wp.db.service;

import lombok.RequiredArgsConstructor;
import mk.ukim.finki.wp.db.entity.user.UserEntity;
import mk.ukim.finki.wp.db.repository.UserEntityRepository;
import org.springframework.security.core.userdetails.*;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
@RequiredArgsConstructor
public class CustomUserDetailsService implements UserDetailsService {

    private final UserEntityRepository userEntityRepository;

    @Override
    public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {

        UserEntity user = userEntityRepository
                .findByEmail(email)
                .orElseThrow(() -> new UsernameNotFoundException("User not found: " + email));

        return new org.springframework.security.core.userdetails.User(
                user.getEmail(),
                user.getPassword(),
                List.of(new SimpleGrantedAuthority("ROLE_" + user.getRole().name()))
        );
    }
}