//
   //  ========================================================================
   //  Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package com.acme;
  
  import java.io.IOException;
  import java.util.HashSet;
  import java.util.Set;
  import javax.servlet.Filter;
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletContext;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletRequestWrapper;
  import javax.servlet.ServletResponse;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletRequestWrapper;
  import javax.servlet.http.HttpServletResponse;
  
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  
  /* ------------------------------------------------------------ */
  /** TestFilter.
   *
   * This filter checks for a none local request, and if the init parameter
   * "remote" is not set to true, then all non local requests are forwarded
   * to /remote.html
   *
   */
  public class TestFilter implements Filter
  {
      private static final Logger LOG = Log.getLogger(TestFilter.class);
  
      private boolean _remote;
      private ServletContext _context;
      private final Set<String> _allowed = new HashSet<String>();
  
      /* ------------------------------------------------------------ */
      /*
       * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
       */
      @Override
      public void init(FilterConfig filterConfig) throws ServletException
      {
          _context= filterConfig.getServletContext();
          _remote=Boolean.parseBoolean(filterConfig.getInitParameter("remote"));
          _allowed.add("/favicon.ico");
          _allowed.add("/jetty_banner.gif");
  
          LOG.debug("TestFilter#remote="+_remote);
      }
  
      /* ------------------------------------------------------------ */
      /*
       * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
       */
      @Override
      public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
              throws IOException, ServletException
      {
          String from = request.getRemoteHost();
          String to = request.getServerName();
          String path=((HttpServletRequest)request).getServletPath();
  
          if (!"/remote.html".equals(path) && !_remote && !_allowed.contains(path) && (
              !from.equals("localhost") && !from.startsWith("127.") && from.indexOf(":1")<0 ||
              !to.equals("localhost")&&!to.startsWith("127.0.0.") && to.indexOf(":1")<0))
          {
              if ("/".equals(path))
                  _context.getRequestDispatcher("/remote.html").forward(request,response);
              else
                  ((HttpServletResponse)response).sendRedirect("/remote.html");
              return;
          }
  
          Integer old_value=null;
          ServletRequest r = request;
          while (r instanceof ServletRequestWrapper)
              r=((ServletRequestWrapper)r).getRequest();
  
          try
          {
             old_value=(Integer)request.getAttribute("testFilter");
 
             Integer value=(old_value==null)?new Integer(1):new Integer(old_value.intValue()+1);
 
             request.setAttribute("testFilter", value);
 
             String qString = ((HttpServletRequest)request).getQueryString();
             if (qString != null && qString.indexOf("wrap")>=0)
             {
                 request=new HttpServletRequestWrapper((HttpServletRequest)request);
             }
             _context.setAttribute("request"+r.hashCode(),value);
 
             chain.doFilter(request, response);
         }
         finally
         {
             request.setAttribute("testFilter", old_value);
             _context.setAttribute("request"+r.hashCode(),old_value);
         }
     }
 
     /* ------------------------------------------------------------ */
     /*
      * @see javax.servlet.Filter#destroy()
      */
     @Override
     public void destroy()
     {
     }
 
 }