/*
    * Copyright 2002-2011 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.oauth2.common.DefaultOAuth2AccessToken;
  import org.springframework.security.oauth2.common.OAuth2AccessToken;
  import org.springframework.security.oauth2.provider.ClientDetailsService;
  import org.springframework.security.oauth2.provider.OAuth2RequestFactory;
  import org.springframework.security.oauth2.provider.TokenRequest;
  import org.springframework.security.oauth2.provider.token.AbstractTokenGranter;
  import org.springframework.security.oauth2.provider.token.AuthorizationServerTokenServices;
  
  /**
   * @author Dave Syer
   * 
   */
  public class ClientCredentialsTokenGranter extends AbstractTokenGranter {
  
  	private static final String GRANT_TYPE = "client_credentials";
  	private boolean allowRefresh = false;
  
  	public ClientCredentialsTokenGranter(AuthorizationServerTokenServices tokenServices,
  			ClientDetailsService clientDetailsService, OAuth2RequestFactory requestFactory) {
  		this(tokenServices, clientDetailsService, requestFactory, GRANT_TYPE);
  	}
  
  	protected ClientCredentialsTokenGranter(AuthorizationServerTokenServices tokenServices,
  			ClientDetailsService clientDetailsService, OAuth2RequestFactory requestFactory, String grantType) {
  		super(tokenServices, clientDetailsService, requestFactory, grantType);
  	}
  	
  	public void setAllowRefresh(boolean allowRefresh) {
  		this.allowRefresh = allowRefresh;
  	}
  
  	@Override
  	public OAuth2AccessToken grant(String grantType, TokenRequest tokenRequest) {
  		OAuth2AccessToken token = super.grant(grantType, tokenRequest);
  		if (token != null) {
  			DefaultOAuth2AccessToken norefresh = new DefaultOAuth2AccessToken(token);
  			// The spec says that client credentials should not be allowed to get a refresh token
  			if (!allowRefresh) {
  				norefresh.setRefreshToken(null);
  			}
  			token = norefresh;
  		}
  		return token;
  	}
  
  }