src/main/java/com/mavlushechka/studentdatabase/service/CustomUserDetailsService.java


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package com.mavlushechka.studentdatabase.service;

import com.mavlushechka.studentdatabase.domain.Role;
import com.mavlushechka.studentdatabase.domain.User;
import com.mavlushechka.studentdatabase.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.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;

import java.util.*;

@Service
public class CustomUserDetailsService implements UserDetailsService {
    @Autowired
    private UserRepository userRepository;
    @Autowired
    private BCryptPasswordEncoder bCryptPasswordEncoder;

    public void saveUser(User user) {
        user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
        userRepository.save(user);
    }

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userRepository.findByUsername(username);

        if (user != null) {
            List<GrantedAuthority> authorities = getUserAuthority(user.getRoles());
            return buildUserForAuthentication(user, authorities);
        } else {
            throw new UsernameNotFoundException("Username not found");
        }
    }

    private List<GrantedAuthority> getUserAuthority(Set<Role> userRoles) {
        Set<GrantedAuthority> roles = new HashSet<>();
        userRoles.forEach((role) -> roles.add(new SimpleGrantedAuthority(role.getRole())));
        return new ArrayList<>(roles);
    }

    private UserDetails buildUserForAuthentication(User user, List<GrantedAuthority> authorities) {
        return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(), authorities);
    }
}