/*
    * Copyright 2006-2011 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.oauth2.provider.client;
  
  import org.springframework.security.core.userdetails.User;
  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.password.PasswordEncoder;
  import org.springframework.security.oauth2.provider.ClientDetails;
  import org.springframework.security.oauth2.provider.ClientDetailsService;
  import org.springframework.security.oauth2.provider.NoSuchClientException;
  
  /**
   * @author Dave Syer
   * 
   */
  public class ClientDetailsUserDetailsService implements UserDetailsService {
  
  	private final ClientDetailsService clientDetailsService;
  	private String emptyPassword = "";
  	
  	public ClientDetailsUserDetailsService(ClientDetailsService clientDetailsService) {
  		this.clientDetailsService = clientDetailsService;
  	}
  	
  	/**
  	 * @param passwordEncoder the password encoder to set
  	 */
  	public void setPasswordEncoder(PasswordEncoder passwordEncoder) {
  		this.emptyPassword = passwordEncoder.encode("");
  	}
  
  	public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
  		ClientDetails clientDetails;
  		try {
  			clientDetails = clientDetailsService.loadClientByClientId(username);
  		} catch (NoSuchClientException e) {
  			throw new UsernameNotFoundException(e.getMessage(), e);
  		}
  		String clientSecret = clientDetails.getClientSecret();
  		if (clientSecret== null || clientSecret.trim().length()==0) {
  			clientSecret = emptyPassword;
  		}
  		return new User(username, clientSecret, clientDetails.getAuthorities());
  	}
  
  }