UserDetailsServiceImpl.java

package com.electroniccalendar.electroniccalendar.service;

import com.electroniccalendar.electroniccalendar.model.User;
import com.electroniccalendar.electroniccalendar.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
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.Collections;

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

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userRepository.findByUsername(username).orElseThrow(() ->
                new UsernameNotFoundException("Пользователь с таким именем не найден: " + username));


        return new org.springframework.security.core.userdetails.User(
                user.getUsername(),
                user.getPassword(),
                true,
                true,
                true,
                true,
                Collections.singleton(new SimpleGrantedAuthority("ROLE_USER"))
        );
    }
}