/*
    * 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.implicit;
  
  
  import org.springframework.security.authentication.InsufficientAuthenticationException;
  import org.springframework.security.core.Authentication;
  import org.springframework.security.core.context.SecurityContextHolder;
  import org.springframework.security.oauth2.provider.ClientDetails;
  import org.springframework.security.oauth2.provider.ClientDetailsService;
  import org.springframework.security.oauth2.provider.OAuth2Authentication;
  import org.springframework.security.oauth2.provider.OAuth2Request;
  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;
  import org.springframework.util.Assert;
  
  /**
   * @author Dave Syer
   * 
   */
  public class ImplicitTokenGranter extends AbstractTokenGranter {
  
  	private static final String GRANT_TYPE = "implicit";
  
  	public ImplicitTokenGranter(AuthorizationServerTokenServices tokenServices, ClientDetailsService clientDetailsService, OAuth2RequestFactory requestFactory) {
  		this(tokenServices, clientDetailsService, requestFactory, GRANT_TYPE);
  	}
  
  	protected ImplicitTokenGranter(AuthorizationServerTokenServices tokenServices, ClientDetailsService clientDetailsService,
  			OAuth2RequestFactory requestFactory, String grantType) {
  		super(tokenServices, clientDetailsService, requestFactory, grantType);
  	}
  
  	@Override
  	protected OAuth2Authentication getOAuth2Authentication(ClientDetails client, TokenRequest clientToken) {
  
  		Authentication userAuth = SecurityContextHolder.getContext().getAuthentication();
  		if (userAuth==null || !userAuth.isAuthenticated()) {
  			throw new InsufficientAuthenticationException("There is no currently logged in user");
  		}
  		Assert.state(clientToken instanceof ImplicitTokenRequest, "An ImplicitTokenRequest is required here. Caller needs to wrap the TokenRequest.");
  		
  		OAuth2Request requestForStorage = ((ImplicitTokenRequest)clientToken).getOAuth2Request();
  		
  		return new OAuth2Authentication(requestForStorage, userAuth);
  
  	}
  	
  	@SuppressWarnings("deprecation")
  	public void setImplicitGrantService(ImplicitGrantService service) {
  	}
  
  }