/*
 * Copyright 2002-2016 the original author or authors.
 *
 * 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
 *
 *      https://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.
 */

package org.springframework.security.ldap.authentication;

import java.util.Collection;

import org.springframework.ldap.core.DirContextOperations;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.ldap.userdetails.LdapAuthoritiesPopulator;
import org.springframework.util.Assert;

/**
 * Simple LdapAuthoritiesPopulator which delegates to a UserDetailsService, using the name
 * which was supplied at login as the username.
 *
 * @author Luke Taylor
 * @since 2.0
 */
public class UserDetailsServiceLdapAuthoritiesPopulator implements LdapAuthoritiesPopulator {

	private final UserDetailsService userDetailsService;

	public UserDetailsServiceLdapAuthoritiesPopulator(UserDetailsService userService) {
		Assert.notNull(userService, "userDetailsService cannot be null");
		this.userDetailsService = userService;
	}

	@Override
	public Collection<? extends GrantedAuthority> getGrantedAuthorities(DirContextOperations userData,
			String username) {
		return this.userDetailsService.loadUserByUsername(username).getAuthorities();
	}

}
