// ========================================================================
// Copyright 1999-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================
package org.mortbay.jetty.handler;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.mortbay.jetty.HttpConnection;
import org.mortbay.jetty.HttpGenerator;
import org.mortbay.jetty.MimeTypes;
import org.mortbay.util.ByteArrayISO8859Writer;
import org.mortbay.util.StringUtil;
/* ------------------------------------------------------------ */
/** Handler for Error pages
* A handler that is registered at the org.mortbay.http.ErrorHandler
* context attributed and called by the HttpResponse.sendError method to write a
* error page.
*
* @author Greg Wilkins (gregw)
*/
public class ErrorHandler extends AbstractHandler
{
boolean _showStacks=true;
/* ------------------------------------------------------------ */
/*
* @see org.mortbay.jetty.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
*/
public void handle(String target, HttpServletRequest request, HttpServletResponse response, int dispatch) throws IOException
{
HttpConnection.getCurrentConnection().getRequest().setHandled(true);
response.setContentType(MimeTypes.TEXT_HTML_8859_1);
ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096);
HttpConnection connection = HttpConnection.getCurrentConnection();
handleErrorPage(request, writer, connection.getResponse().getStatus(), connection.getResponse().getReason());
writer.flush();
response.setContentLength(writer.size());
writer.writeTo(response.getOutputStream());
writer.destroy();
}
/* ------------------------------------------------------------ */
protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message)
throws IOException
{
writeErrorPage(request, writer, code, message, _showStacks);
}
/* ------------------------------------------------------------ */
protected void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
throws IOException
{
if (message == null)
message=HttpGenerator.getReason(code);
else
{
message= StringUtil.replace(message, "&", "&");
message= StringUtil.replace(message, "<", "<");
message= StringUtil.replace(message, ">", ">");
}
writer.write("<html>\n<head>\n");
writeErrorPageHead(request,writer,code,message);
writer.write("</head>\n<body>");
writeErrorPageBody(request,writer,code,message,showStacks);
writer.write("\n</body>\n</html>\n");
}
/* ------------------------------------------------------------ */
protected void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message)
throws IOException
{
writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"/>\n");
writer.write("<title>Error ");
writer.write(Integer.toString(code));
writer.write(' ');
if (message!=null)
writer.write(message);
writer.write("</title>\n");
}
/* ------------------------------------------------------------ */
protected void writeErrorPageBody(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
throws IOException
{
String uri= request.getRequestURI();
if (uri!=null)
{
uri= StringUtil.replace(uri, "&", "&");
uri= StringUtil.replace(uri, "<", "<");
uri= StringUtil.replace(uri, ">", ">");
}
writeErrorPageMessage(request,writer,code,message,uri);
if (showStacks)
writeErrorPageStacks(request,writer);
writer.write("<p><i><small><a href=\"http://jetty.mortbay.org/\">Powered by Jetty://</a></small></i></p>");
for (int i= 0; i < 20; i++)
writer.write("<br/> \n");
}
/* ------------------------------------------------------------ */
protected void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri)
throws IOException
{
writer.write("<h2>HTTP ERROR: ");
writer.write(Integer.toString(code));
writer.write("</h2><pre>");
writer.write(message);
writer.write("</pre>\n<p>RequestURI=");
writer.write(uri);
writer.write("</p>");
}
/* ------------------------------------------------------------ */
protected void writeErrorPageStacks(HttpServletRequest request, Writer writer)
throws IOException
{
Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception");
while(th!=null)
{
writer.write("<h3>Caused by:</h3><pre>");
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
th.printStackTrace(pw);
pw.flush();
writer.write(sw.getBuffer().toString());
writer.write("</pre>\n");
th =th.getCause();
}
}
/* ------------------------------------------------------------ */
/**
* @return True if stack traces are shown in the error pages
*/
public boolean isShowStacks()
{
return _showStacks;
}
/* ------------------------------------------------------------ */
/**
* @param showStacks True if stack traces are shown in the error pages
*/
public void setShowStacks(boolean showStacks)
{
_showStacks = showStacks;
}
}