/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  package org.apache.myfaces.webapp.filter;
  
  import javax.faces.FacesException;
  import javax.faces.context.ExternalContext;
  import javax.faces.context.FacesContext;
  import javax.faces.event.PhaseEvent;
  import javax.faces.event.PhaseId;
  import javax.faces.event.PhaseListener;
  import javax.servlet.ServletContext;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.myfaces.renderkit.html.util.AddResource;
  import org.apache.myfaces.renderkit.html.util.AddResourceFactory;
  import org.apache.myfaces.tomahawk.util.ExternalContextUtils;
  
  /**
   * This listener is used for serve resources, as a replacement of 
   * ExtensionsFilter serve resources feature.
   * <p>
   * The idea is map FacesServlet to org.apache.myfaces.RESOURCE_VIRTUAL_PATH
   * (Default is "/faces/myFacesExtensionResource), so this
   * listener can receive the request.
   * </p>
   * 
   * @author Martin Marinschek (latest modification by $Author: lu4242 $)
   * @version $Revision: 685725 $ $Date: 2008-08-13 18:14:31 -0500 (Wed, 13 Aug 2008) $
   */
  public class ServeResourcePhaseListener implements PhaseListener {
  
      private Log log = LogFactory.getLog(ServeResourcePhaseListener.class);
  
      public static final String DOFILTER_CALLED = "org.apache.myfaces.component.html.util.ExtensionFilter.doFilterCalled";
  
      public void afterPhase(PhaseEvent event) {
      }
  
      public void beforePhase(PhaseEvent event) {
          if(event.getPhaseId()==PhaseId.RESTORE_VIEW || event.getPhaseId()==PhaseId.RENDER_RESPONSE) {
  
              FacesContext fc = event.getFacesContext();
              ExternalContext externalContext = event.getFacesContext().getExternalContext();
  
              if(externalContext.getRequestMap().get(DOFILTER_CALLED)!=null)
              {
                  //we have already been called (before-restore-view, and we are now in render-response),
                  // no need to do everything again...
                  return;
              }
  
              externalContext.getRequestMap().put(DOFILTER_CALLED,"true");
  
  
              //Use ExternalContextUtils to find if this is a portled request
              //if(externalContext.getRequest() instanceof PortletRequest) {            
              if(ExternalContextUtils.getRequestType(externalContext).isPortlet()) {
                  //we are in portlet-world! in portlet 1.0 (JSR-168), we cannot do anything here, but
                  //TODO in portlet 2.0 (JSR-286), we will write the resource to the stream here if we
                  //get a resource-request (resource-requests are only available in 286)
                  if(log.isDebugEnabled()) {
                      log.debug("We are in portlet-space, but we cannot do anything here in JSR-168 - " +
                              "for resource-serving, our resource-servlet has to be registered.");
                  }
              }
              else if(externalContext.getResponse() instanceof HttpServletResponse) {
  
                  HttpServletResponse response = (HttpServletResponse) fc.getExternalContext().getResponse();
                  HttpServletRequest request = (HttpServletRequest) fc.getExternalContext().getRequest();
                  ServletContext context = (ServletContext) fc.getExternalContext().getContext();
  
                  // Serve resources
                  AddResource addResource;
  
                  try
                  {
                      addResource= AddResourceFactory.getInstance(request, context);
                      if( addResource.isResourceUri(context, request ) ){
                          addResource.serveResource(context, request, response);
                          event.getFacesContext().responseComplete();
                         return;
                     }
                 }
                 catch(Throwable th)
                 {
                     log.error("Exception wile retrieving addResource",th);
                     throw new FacesException(th);
                 }
             }
             else {
                 if(log.isDebugEnabled()) {
                     log.debug("Response of type : "+(
                             externalContext.getResponse()==null?"null":externalContext.getResponse().getClass().getName())+" not handled so far.");
                 }
             }
         }
     }
 
     public PhaseId getPhaseId() {
         return PhaseId.ANY_PHASE;
     }
 }