/*
    * Copyright 2002-2013 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.config.annotation.web.configuration;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.context.annotation.Import;
  import org.springframework.core.annotation.Order;
  import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
  import org.springframework.security.config.annotation.web.builders.HttpSecurity;
  import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
  import org.springframework.security.config.http.SessionCreationPolicy;
  import org.springframework.security.core.userdetails.UserDetailsService;
  import org.springframework.security.oauth2.config.annotation.configuration.ClientDetailsServiceConfiguration;
  import org.springframework.security.oauth2.config.annotation.configurers.ClientDetailsServiceConfigurer;
  import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerSecurityConfigurer;
  import org.springframework.security.oauth2.provider.ClientDetailsService;
  import org.springframework.security.oauth2.provider.endpoint.FrameworkEndpointHandlerMapping;
  
  import java.util.Collections;
  import java.util.List;
  
  /**
   * @author Rob Winch
   * @author Dave Syer
   * 
   */
  @Configuration
  @Order(0)
  @Import({ ClientDetailsServiceConfiguration.class, AuthorizationServerEndpointsConfiguration.class })
  public class AuthorizationServerSecurityConfiguration extends WebSecurityConfigurerAdapter {
  
  	@Autowired
  	private List<AuthorizationServerConfigurer> configurers = Collections.emptyList();
  
  	@Autowired
  	private ClientDetailsService clientDetailsService;
  
  	@Autowired
  	private AuthorizationServerEndpointsConfiguration endpoints;
  
  	@Autowired
  	public void configure(ClientDetailsServiceConfigurer clientDetails) throws Exception {
  		for (AuthorizationServerConfigurer configurer : configurers) {
  			configurer.configure(clientDetails);
  		}
  	}
  
  	@Override
  	protected void configure(AuthenticationManagerBuilder auth) throws Exception {
  		// Over-riding to make sure this.disableLocalConfigureAuthenticationBldr = false
  		// This will ensure that when this configurer builds the AuthenticationManager it will not attempt
  		// to find another 'Global' AuthenticationManager in the ApplicationContext (if available),
  		// and set that as the parent of this 'Local' AuthenticationManager.
  		// This AuthenticationManager should only be wired up with an AuthenticationProvider
  		// composed of the ClientDetailsService (wired in this configuration) for authenticating 'clients' only.
  	}
  
  	@Override
  	protected void configure(HttpSecurity http) throws Exception {
  		AuthorizationServerSecurityConfigurer configurer = new AuthorizationServerSecurityConfigurer();
  		FrameworkEndpointHandlerMapping handlerMapping = endpoints.oauth2EndpointHandlerMapping();
  		http.setSharedObject(FrameworkEndpointHandlerMapping.class, handlerMapping);
  		configure(configurer);
  		http.apply(configurer);
  		String tokenEndpointPath = handlerMapping.getServletPath("/oauth/token");
  		String tokenKeyPath = handlerMapping.getServletPath("/oauth/token_key");
  		String checkTokenPath = handlerMapping.getServletPath("/oauth/check_token");
  		if (!endpoints.getEndpointsConfigurer().isUserDetailsServiceOverride()) {
  			UserDetailsService userDetailsService = http.getSharedObject(UserDetailsService.class);
  			endpoints.getEndpointsConfigurer().userDetailsService(userDetailsService);
  		}
  		// @formatter:off
  		http
          	.authorizeRequests()
              	.antMatchers(tokenEndpointPath).fullyAuthenticated()
              	.antMatchers(tokenKeyPath).access(configurer.getTokenKeyAccess())
              	.antMatchers(checkTokenPath).access(configurer.getCheckTokenAccess())
          .and()
          	.requestMatchers()
              	.antMatchers(tokenEndpointPath, tokenKeyPath, checkTokenPath)
          .and()
          	.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.NEVER);
  		// @formatter:on
  		http.setSharedObject(ClientDetailsService.class, clientDetailsService);
  	}
 
 	protected void configure(AuthorizationServerSecurityConfigurer oauthServer) throws Exception {
 		for (AuthorizationServerConfigurer configurer : configurers) {
 			configurer.configure(oauthServer);
 		}
 	}
 
 }