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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.InitOperations;
   26   import org.apache.struts2.dispatcher.ng.PrepareOperations;
   27   
   28   import javax.servlet;
   29   import javax.servlet.http.HttpServletRequest;
   30   import javax.servlet.http.HttpServletResponse;
   31   import java.io.IOException;
   32   import java.util.List;
   33   import java.util.regex.Pattern;
   34   
   35   /**
   36    * Prepares the request for execution by a later {@link org.apache.struts2.dispatcher.ng.filter.StrutsExecuteFilter} filter instance.
   37    */
   38   public class StrutsPrepareFilter implements StrutsStatics, Filter {
   39   
   40   	protected static final String REQUEST_EXCLUDED_FROM_ACTION_MAPPING = StrutsPrepareFilter.class.getName() + ".REQUEST_EXCLUDED_FROM_ACTION_MAPPING";
   41   
   42       protected PrepareOperations prepare;
   43   	protected List<Pattern> excludedPatterns = null;
   44   
   45   	public void init(FilterConfig filterConfig) throws ServletException {
   46           InitOperations init = new InitOperations();
   47           try {
   48               FilterHostConfig config = new FilterHostConfig(filterConfig);
   49               init.initLogging(config);
   50               Dispatcher dispatcher = init.initDispatcher(config);
   51   
   52               prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
   53   			this.excludedPatterns = init.buildExcludedPatternsList(dispatcher);
   54   
   55               postInit(dispatcher, filterConfig);
   56           } finally {
   57               init.cleanup();
   58           }
   59       }
   60   
   61       /**
   62        * Callback for post initialization
   63        */
   64       protected void postInit(Dispatcher dispatcher, FilterConfig filterConfig) {
   65       }
   66   
   67       public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
   68   
   69           HttpServletRequest request = (HttpServletRequest) req;
   70           HttpServletResponse response = (HttpServletResponse) res;
   71   
   72           try {
   73               prepare.setEncodingAndLocale(request, response);
   74               prepare.createActionContext(request, response);
   75               prepare.assignDispatcherToThread();
   76   			if ( excludedPatterns != null && prepare.isUrlExcluded(request, excludedPatterns)) {
   77   				request.setAttribute(REQUEST_EXCLUDED_FROM_ACTION_MAPPING, new Object());
   78   			} else {
   79   				request = prepare.wrapRequest(request);
   80   				prepare.findActionMapping(request, response);
   81   			}
   82               chain.doFilter(request, response);
   83           } finally {
   84               prepare.cleanupRequest(request);
   85           }
   86       }
   87   
   88   	public void destroy() {
   89           prepare.cleanupDispatcher();
   90       }
   91   }

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