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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 }