UserDetailsServiceImpl.java

package com.MedilaboSolutions.gateway.security;

import com.MedilaboSolutions.gateway.model.User;
import com.MedilaboSolutions.gateway.repository.UserRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.ReactiveUserDetailsService;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;
import reactor.core.publisher.Mono;

import java.util.Collections;

@Service
@RequiredArgsConstructor
public class UserDetailsServiceImpl implements ReactiveUserDetailsService {

    private final UserRepository userRepository;

    @Override
    public Mono<UserDetails> findByUsername(String username) {
        return userRepository.findByUsername(username)
                .switchIfEmpty(Mono.error(new UsernameNotFoundException("User not found: " + username)))
                .map(this::toUserDetails);
    }

    private UserDetails toUserDetails(User user) {
        return org.springframework.security.core.userdetails.User.builder()
                .username(user.getUsername())
                .password(user.getPassword())
                .authorities(Collections.singleton(new SimpleGrantedAuthority("ROLE_" + user.getRole())))
                .build();
    }
}