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    1   /*
    2    * $Id: DefaultActionSupport.java 651946 2008-04-27 13:41:38Z apetrelli $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
   10    * with the License.  You may obtain a copy of the License at
   11    *
   12    *  http://www.apache.org/licenses/LICENSE-2.0
   13    *
   14    * Unless required by applicable law or agreed to in writing,
   15    * software distributed under the License is distributed on an
   16    * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   17    * KIND, either express or implied.  See the License for the
   18    * specific language governing permissions and limitations
   19    * under the License.
   20    */
   21   package org.apache.struts2.dispatcher.ng.filter;
   22   
   23   import org.apache.struts2.StrutsStatics;
   24   import org.apache.struts2.dispatcher.Dispatcher;
   25   import org.apache.struts2.dispatcher.ng.PrepareOperations;
   26   import org.apache.struts2.dispatcher.ng.ExecuteOperations;
   27   import org.apache.struts2.dispatcher.ng.InitOperations;
   28   import org.apache.struts2.dispatcher.mapper.ActionMapping;
   29   
   30   import javax.servlet;
   31   import javax.servlet.http.HttpServletRequest;
   32   import javax.servlet.http.HttpServletResponse;
   33   import java.io.IOException;
   34   
   35   /**
   36    * Executes the discovered request information.  This filter requires the {@link StrutsPrepareFilter} to have already
   37    * been executed in the current chain.
   38    */
   39   public class StrutsExecuteFilter implements StrutsStatics, Filter {
   40       protected PrepareOperations prepare;
   41       protected ExecuteOperations execute;
   42   
   43       protected FilterConfig filterConfig;
   44   
   45       public void init(FilterConfig filterConfig) throws ServletException {
   46           this.filterConfig = filterConfig;
   47       }
   48   
   49       protected synchronized void lazyInit() {
   50           if (execute == null) {
   51               InitOperations init = new InitOperations();
   52               Dispatcher dispatcher = init.findDispatcherOnThread();
   53               init.initStaticContentLoader(new FilterHostConfig(filterConfig), dispatcher);
   54   
   55               prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
   56               execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);
   57           }
   58   
   59       }
   60   
   61       public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
   62   
   63           HttpServletRequest request = (HttpServletRequest) req;
   64           HttpServletResponse response = (HttpServletResponse) res;
   65   
   66   		if (excludeUrl(request)) {
   67   			chain.doFilter(request, response);
   68   			return;
   69   		}
   70   
   71           // This is necessary since we need the dispatcher instance, which was created by the prepare filter
   72   		if (execute == null) {
   73   			lazyInit();
   74   		}
   75   
   76           ActionMapping mapping = prepare.findActionMapping(request, response);
   77   
   78           //if recusrion counter is > 1, it means we are in a "forward", in that case a mapping will still be
   79           //in the request, if we handle it, it will lead to an infinte loop, see WW-3077
   80           Integer recursionCounter = (Integer) request.getAttribute(PrepareOperations.CLEANUP_RECURSION_COUNTER);
   81   
   82           if (mapping == null || recursionCounter > 1) {
   83               boolean handled = execute.executeStaticResourceRequest(request, response);
   84               if (!handled) {
   85                   chain.doFilter(request, response);
   86               }
   87           } else {
   88               execute.executeAction(request, response, mapping);
   89           }
   90       }
   91   
   92   	private boolean excludeUrl(HttpServletRequest request) {
   93   		return request.getAttribute(StrutsPrepareFilter.REQUEST_EXCLUDED_FROM_ACTION_MAPPING) != null;
   94   	}
   95   
   96       public void destroy() {
   97           prepare = null;
   98           execute = null;
   99           filterConfig = null;
  100       }
  101   }

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