/*
    * Copyright 2014 James Pether Sörling
    *
    * 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
    *
    *   http://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.
   *
   *	$Id$
   *  $HeadURL$
  */
  package com.hack23.cia.web.impl.ui.application.web.listener;
  
  import java.util.ArrayList;
  import java.util.Collection;
  
  import javax.servlet.http.HttpSession;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.context.ApplicationListener;
  import org.springframework.security.authentication.AnonymousAuthenticationToken;
  import org.springframework.security.core.authority.SimpleGrantedAuthority;
  import org.springframework.security.core.context.SecurityContextHolder;
  import org.springframework.security.web.session.HttpSessionDestroyedEvent;
  import org.springframework.stereotype.Service;
  
  import com.hack23.cia.service.api.ApplicationManager;
  import com.hack23.cia.service.api.action.application.DestroyApplicationSessionRequest;
  
  /**
   * The Class HttpSessionDestroyedEventListener.
   */
  @Service
  public final class HttpSessionDestroyedEventListener implements ApplicationListener<HttpSessionDestroyedEvent> {
  
  	/** The Constant PRINCIPAL. */
  	private static final String PRINCIPAL = "principal";
  
  	/** The Constant KEY. */
  	private static final String KEY = "key";
  
  	/** The Constant ROLE_ANONYMOUS. */
  	private static final String ROLE_ANONYMOUS = "ROLE_ANONYMOUS";
  
  	/** The Constant LOG_MSG_SESSION_DESTROYED_SESSION_ID. */
  	private static final String LOG_MSG_SESSION_DESTROYED_SESSION_ID = "Session destroyed SESSION_ID :{}";
  
  	/** The Constant LOGGER. */
  	private static final Logger LOGGER = LoggerFactory.getLogger(HttpSessionDestroyedEventListener.class);
  
  	/** The application manager. */
  	@Autowired
  	private ApplicationManager applicationManager;
  
  	/**
  	 * Instantiates a new http session destroyed event listener.
  	 */
  	public HttpSessionDestroyedEventListener() {
  		super();
  	}
  
  	@Override
  	public void onApplicationEvent(final HttpSessionDestroyedEvent event) {
  		final HttpSession httpSession = event.getSession();
  		final Collection<SimpleGrantedAuthority> authorities = new ArrayList<>();
  		authorities.add(new SimpleGrantedAuthority(ROLE_ANONYMOUS));
  		final DestroyApplicationSessionRequest destroyApplicationSessionRequest = new DestroyApplicationSessionRequest();
  		destroyApplicationSessionRequest.setSessionId(httpSession.getId());
  
  		SecurityContextHolder.getContext()
  				.setAuthentication(new AnonymousAuthenticationToken(KEY, PRINCIPAL, authorities));
  		applicationManager.service(destroyApplicationSessionRequest);
  		SecurityContextHolder.getContext().setAuthentication(null);
  
  		LOGGER.info(LOG_MSG_SESSION_DESTROYED_SESSION_ID, httpSession.getId());
  	}
  
  }