UserDetailsServiceImpl.java

package com.accenture.codingtest.springbootcodingtest.config;

import com.accenture.codingtest.springbootcodingtest.entity.User;
import com.accenture.codingtest.springbootcodingtest.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;

import java.util.Set;
import java.util.stream.Collectors;

@Service
public class UserDetailsServiceImpl implements UserDetailsService {
    private final UserRepository userRepository;

    @Autowired
    public UserDetailsServiceImpl(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userRepository.findByUsername(username)
                .orElseThrow(() -> new UsernameNotFoundException("User not found"));


        Set<GrantedAuthority> authorities = user.getRoles().stream()
                .map(role -> new SimpleGrantedAuthority(role.getAuthority()))
                .collect(Collectors.toSet());

        return new org.springframework.security.core.userdetails.User(
                user.getUsername(),
                user.getPassword(),
                authorities
        );
    }

}