// ========================================================================
   // Copyright (c) 1999-2009 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 org.eclipse.jetty.server.handler;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.net.URL;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.eclipse.jetty.http.HttpHeaders;
  import org.eclipse.jetty.http.HttpMethods;
  import org.eclipse.jetty.http.MimeTypes;
  import org.eclipse.jetty.server.Handler;
  import org.eclipse.jetty.server.Request;
  import org.eclipse.jetty.server.Server;
  import org.eclipse.jetty.util.ByteArrayISO8859Writer;
  import org.eclipse.jetty.util.IO;
  import org.eclipse.jetty.util.StringUtil;
  import org.eclipse.jetty.util.log.Log;
  
  
  /* ------------------------------------------------------------ */
  /** Default Handler.
   * 
   * This handle will deal with unhandled requests in the server.
   * For requests for favicon.ico, the Jetty icon is served. 
   * For reqests to '/' a 404 with a list of known contexts is served.
   * For all other requests a normal 404 is served.
   * TODO Implement OPTIONS and TRACE methods for the server.
   * 
   * 
   * @org.apache.xbean.XBean
   */
  public class DefaultHandler extends AbstractHandler
  {
      final long _faviconModified=(System.currentTimeMillis()/1000)*1000;
      byte[] _favicon;
      boolean _serveIcon=true;
      boolean _showContexts=true;
      
      public DefaultHandler()
      {
          try
          {
              URL fav = this.getClass().getClassLoader().getResource("org/eclipse/jetty/favicon.ico");
              if (fav!=null)
              _favicon=IO.readBytes(fav.openStream());
          }
          catch(Exception e)
          {
              Log.warn(e);
          }
      }
      
      /* ------------------------------------------------------------ */
      /* 
       * @see org.eclipse.jetty.server.server.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
       */
      public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
      {              
          if (response.isCommitted() || baseRequest.isHandled())
              return;
          
          baseRequest.setHandled(true);
          
          String method=request.getMethod();
  
          // little cheat for common request
          if (_serveIcon && _favicon!=null && method.equals(HttpMethods.GET) && request.getRequestURI().equals("/favicon.ico"))
          {
              if (request.getDateHeader(HttpHeaders.IF_MODIFIED_SINCE)==_faviconModified)
                  response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
              else
              {
                  response.setStatus(HttpServletResponse.SC_OK);
                  response.setContentType("image/x-icon");
                  response.setContentLength(_favicon.length);
                  response.setDateHeader(HttpHeaders.LAST_MODIFIED, _faviconModified);
                  response.setHeader(HttpHeaders.CACHE_CONTROL,"max-age=360000,public");
                  response.getOutputStream().write(_favicon);
              }
              return;
          }
          
          
         if (!method.equals(HttpMethods.GET) || !request.getRequestURI().equals("/"))
         {
             response.sendError(HttpServletResponse.SC_NOT_FOUND);
             return;   
         }
 
         response.setStatus(HttpServletResponse.SC_NOT_FOUND);
         response.setContentType(MimeTypes.TEXT_HTML);
         
         ByteArrayISO8859Writer writer = new ByteArrayISO8859Writer(1500);
 
         String uri=request.getRequestURI();
         uri=StringUtil.replace(uri,"<","&lt;");
         uri=StringUtil.replace(uri,">","&gt;");
         
         writer.write("<HTML>\n<HEAD>\n<TITLE>Error 404 - Not Found");
         writer.write("</TITLE>\n<BODY>\n<H2>Error 404 - Not Found.</H2>\n");
         writer.write("No context on this server matched or handled this request.<BR>");
         
         if (_showContexts)
         {
             writer.write("Contexts known to this server are: <ul>");
             
             Server server = getServer();
             Handler[] handlers = server==null?null:server.getChildHandlersByClass(ContextHandler.class);
      
             for (int i=0;handlers!=null && i<handlers.length;i++)
             {
                 ContextHandler context = (ContextHandler)handlers[i];
                 if (context.isRunning())
                 {
                     writer.write("<li><a href=\"");
                     if (context.getVirtualHosts()!=null && context.getVirtualHosts().length>0)
                         writer.write("http://"+context.getVirtualHosts()[0]+":"+request.getLocalPort());
                     writer.write(context.getContextPath());
                     if (context.getContextPath().length()>1 && context.getContextPath().endsWith("/"))
                         writer.write("/");
                     writer.write("\">");
                     writer.write(context.getContextPath());
                     if (context.getVirtualHosts()!=null && context.getVirtualHosts().length>0)
                         writer.write("&nbsp;@&nbsp;"+context.getVirtualHosts()[0]+":"+request.getLocalPort());
                     writer.write("&nbsp;--->&nbsp;");
                     writer.write(context.toString());
                     writer.write("</a></li>\n");
                 }
                 else
                 {
                     writer.write("<li>");
                     writer.write(context.getContextPath());
                     if (context.getVirtualHosts()!=null && context.getVirtualHosts().length>0)
                         writer.write("&nbsp;@&nbsp;"+context.getVirtualHosts()[0]+":"+request.getLocalPort());
                     writer.write("&nbsp;--->&nbsp;");
                     writer.write(context.toString());
                     if (context.isFailed())
                         writer.write(" [failed]");
                     if (context.isStopped())
                         writer.write(" [stopped]");
                     writer.write("</li>\n");
                 }
             }
         }
         
         for (int i=0;i<10;i++)
             writer.write("\n<!-- Padding for IE                  -->");
         
         writer.write("\n</BODY>\n</HTML>\n");
         writer.flush();
         response.setContentLength(writer.size());
         OutputStream out=response.getOutputStream();
         writer.writeTo(out);
         out.close();
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @return Returns true if the handle can server the jetty favicon.ico
      */
     public boolean getServeIcon()
     {
         return _serveIcon;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @param serveIcon true if the handle can server the jetty favicon.ico
      */
     public void setServeIcon(boolean serveIcon)
     {
         _serveIcon = serveIcon;
     }
     
     public boolean getShowContexts()
     {
         return _showContexts;
     }
 
     public void setShowContexts(boolean show)
     {
         _showContexts = show;
     }
 
 }