1   /**
    2    *  Licensed to the Apache Software Foundation (ASF) under one or more
    3    *  contributor license agreements.  See the NOTICE file distributed with
    4    *  this work for additional information regarding copyright ownership.
    5    *  The ASF licenses this file to You under the Apache License, Version 2.0
    6    *  (the "License"); you may not use this file except in compliance with
    7    *  the License.  You may obtain a copy of the License at
    8    *
    9    *     http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    *  Unless required by applicable law or agreed to in writing, software
   12    *  distributed under the License is distributed on an "AS IS" BASIS,
   13    *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    *  See the License for the specific language governing permissions and
   15    *  limitations under the License.
   16    */
   17   
   18   package org.apache.geronimo.console.servlet;
   19   
   20   import java.io.IOException;
   21   
   22   import javax.servlet.RequestDispatcher;
   23   import javax.servlet.ServletConfig;
   24   import javax.servlet.ServletContext;
   25   import javax.servlet.ServletException;
   26   import javax.servlet.UnavailableException;
   27   import javax.servlet.http.HttpServlet;
   28   import javax.servlet.http.HttpServletRequest;
   29   import javax.servlet.http.HttpServletResponse;
   30   
   31   /**
   32    * Servlet that forwards GET and POST requests to a servlet
   33    * in an alternate context. The servlet path and alternate
   34    * context are passed in as configuration parameters (e.g.
   35    * via <config-param> elements in the web.xml).
   36    */
   37   public class ContextForwardServlet extends HttpServlet {
   38   
   39       // name of the configuration parameter containing the context path
   40       public static final String CONTEXT_PATH = "context-path";
   41       // name of the configuration parameter containing the servlet path
   42       public static final String SERVLET_PATH = "servlet-path";
   43   
   44       private String servletPath;
   45       private String contextPath;
   46       
   47       public void init(ServletConfig config) throws ServletException {
   48           super.init(config);
   49           contextPath = config.getInitParameter(CONTEXT_PATH);
   50           servletPath = config.getInitParameter(SERVLET_PATH);
   51           if (contextPath == null || servletPath == null) {
   52               throw new UnavailableException("context-path and servlet-path " +
   53                       "must be provided as configuration parameters");
   54           }
   55       }
   56   
   57       public void doGet(HttpServletRequest req, HttpServletResponse resp)
   58               throws ServletException, IOException {
   59           doPost(req, resp);
   60       }
   61   
   62       public void doPost(HttpServletRequest req, HttpServletResponse resp)
   63               throws ServletException, IOException {
   64           String dispatchURI = servletPath + (req.getPathInfo() == null ? "" : req.getPathInfo());
   65           String queryString = req.getQueryString();
   66           if (queryString != null) {
   67               dispatchURI += "?" + queryString;
   68           }
   69           ServletContext forwardContext = getServletContext().getContext(contextPath);
   70           RequestDispatcher dispatcher = forwardContext.getRequestDispatcher(dispatchURI);    
   71           dispatcher.forward(req, resp);
   72       }
   73   }