/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.repo.webservice.axis;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import org.apache.axis.AxisFault;
import org.apache.axis.MessageContext;
import org.apache.axis.handlers.BasicHandler;
import org.apache.axis.transport.http.HTTPConstants;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ws.security.handler.WSHandlerConstants;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

/**
 * Axis handler that retrieves the TicketCallbackHandler instance from 
 * a Spring context. The authentication service is injected by Spring 
 * so that when it gets called by the WSS4J handler it can verify the 
 * ticket passed to the service.
 * The callback handler is then added to the MessageContext under the standard 
 * WsHandlerConstants.PW_CALLBACK_REF property.
 * 
 * @author gavinc
 */
public class TicketCallbackSpringHandler extends BasicHandler
{
   @SuppressWarnings("unused")
private static final Log logger = LogFactory.getLog(TicketCallbackSpringHandler.class);
   private static final String BEAN_NAME = "ticketCallbackHandler";
   private static final long serialVersionUID = -135125831180499667L;

   /**
    * @see org.apache.axis.Handler#invoke(org.apache.axis.MessageContext)
    */
   public void invoke(MessageContext msgContext) throws AxisFault
   {
      // get hold of the Spring context and retrieve the AuthenticationService
      HttpServletRequest req = (HttpServletRequest)msgContext.getProperty(HTTPConstants.MC_HTTP_SERVLETREQUEST);
      ServletContext servletCtx = req.getSession().getServletContext();
      WebApplicationContext webAppCtx = WebApplicationContextUtils.getRequiredWebApplicationContext(servletCtx);
      TicketCallbackHandler callback = (TicketCallbackHandler)webAppCtx.getBean(BEAN_NAME);
      
      // store the callback in the context where the WS-Security handler can pick it up from
      msgContext.setProperty(WSHandlerConstants.PW_CALLBACK_REF, callback);
   }
}