DomainUserDetailsService.java

package io.github.jhipster.sample.security;

/*-
 * #%L
 * Jhipster Sample Application
 * %%
 * Copyright (C) 2017 Osgiliath
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import io.github.jhipster.sample.domain.User;
import io.github.jhipster.sample.repository.UserRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.Component;
import org.springframework.transaction.annotation.Transactional;

import java.util.*;
import java.util.stream.Collectors;

/**
 * Authenticate a user from the database.
 */
@Component("userDetailsService")
public class DomainUserDetailsService implements UserDetailsService {

    private final Logger log = LoggerFactory.getLogger(DomainUserDetailsService.class);

    private final UserRepository userRepository;

    public DomainUserDetailsService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Override
    @Transactional
    public UserDetails loadUserByUsername(final String login) {
        log.debug("Authenticating {}", login);
        String lowercaseLogin = login.toLowerCase(Locale.ENGLISH);
        Optional<User> userFromDatabase = userRepository.findOneWithAuthoritiesByLogin(lowercaseLogin);
        return userFromDatabase.map(user -> {
            if (!user.getActivated()) {
                throw new UserNotActivatedException("User " + lowercaseLogin + " was not activated");
            }
            List<GrantedAuthority> grantedAuthorities = user.getAuthorities().stream()
                .map(authority -> new SimpleGrantedAuthority(authority.getName()))
                .collect(Collectors.toList());
            return new org.springframework.security.core.userdetails.User(lowercaseLogin,
                user.getPassword(),
                grantedAuthorities);
        }).orElseThrow(() -> new UsernameNotFoundException("User " + lowercaseLogin + " was not found in the " +
        "database"));
    }
}