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//
// ========================================================================
// Copyright (c) 1995-2013 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.servlets;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.GZIPOutputStream;
import javax.servlet.DispatcherType;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.io.UncheckedPrintWriter;
import org.eclipse.jetty.server.Response;
import org.eclipse.jetty.servlets.gzip.AbstractCompressedStream;
import org.eclipse.jetty.servlets.gzip.CompressedResponseWrapper;
/* ------------------------------------------------------------ */
/** Includable GZip Filter.
* This extension to the {@link GzipFilter} that uses Jetty features to allow
* headers to be set during calls to
* {@link javax.servlet.RequestDispatcher#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)}.
* This allows the gzip filter to function correct during includes and to make a decision to gzip or not
* at the time the buffer fills and on the basis of all response headers.
*
* If the init parameter "uncheckedPrintWriter" is set to "true", then the PrintWriter used by
* the wrapped getWriter will be {@link UncheckedPrintWriter}.
*
*/
public class IncludableGzipFilter extends GzipFilter
{
boolean _uncheckedPrintWriter=false;
@Override
public void init(FilterConfig filterConfig) throws ServletException
{
super.init(filterConfig);
String tmp=filterConfig.getInitParameter("uncheckedPrintWriter");
if (tmp!=null)
_uncheckedPrintWriter=Boolean.valueOf(tmp).booleanValue();
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.servlets.GzipFilter#createWrappedResponse(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String)
*/
@Override
protected CompressedResponseWrapper createWrappedResponse(HttpServletRequest request, HttpServletResponse response, final String compressionType)
{
CompressedResponseWrapper wrappedResponse = null;
if (compressionType==null)
{
wrappedResponse = new IncludableResponseWrapper(request,response)
{
@Override
protected AbstractCompressedStream newCompressedStream(HttpServletRequest request,HttpServletResponse response) throws IOException
{
return new AbstractCompressedStream(null,request,this,_vary)
{
@Override
protected DeflaterOutputStream createStream() throws IOException
{
return null;
}
};
}
};
}
else if (compressionType.equals(GZIP))
{
wrappedResponse = new IncludableResponseWrapper(request,response)
{
@Override
protected AbstractCompressedStream newCompressedStream(HttpServletRequest request,HttpServletResponse response) throws IOException
{
return new AbstractCompressedStream(compressionType,request,this,_vary)
{
@Override
protected DeflaterOutputStream createStream() throws IOException
{
return new GZIPOutputStream(_response.getOutputStream(),_bufferSize);
}
};
}
};
}
else if (compressionType.equals(DEFLATE))
{
wrappedResponse = new IncludableResponseWrapper(request,response)
{
@Override
protected AbstractCompressedStream newCompressedStream(HttpServletRequest request,HttpServletResponse response) throws IOException
{
return new AbstractCompressedStream(compressionType,request,this,_vary)
{
@Override
protected DeflaterOutputStream createStream() throws IOException
{
return new DeflaterOutputStream(_response.getOutputStream(),new Deflater(_deflateCompressionLevel, _deflateNoWrap));
}
};
}
};
}
else
{
throw new IllegalStateException(compressionType + " not supported");
}
configureWrappedResponse(wrappedResponse);
return wrappedResponse;
}
// Extend CompressedResponseWrapper to be able to set headers during include and to create unchecked printwriters
private abstract class IncludableResponseWrapper extends CompressedResponseWrapper
{
public IncludableResponseWrapper(HttpServletRequest request, HttpServletResponse response)
{
super(request,response);
}
@Override
public void setHeader(String name,String value)
{
if (getRequest().getDispatcherType()==DispatcherType.INCLUDE)
{
if (!"etag".equalsIgnoreCase(name) && !name.startsWith("content-"))
{
HttpServletResponse response = (HttpServletResponse)getResponse();
response.setHeader("org.eclipse.jetty.server.include."+name,value);
}
}
else
super.setHeader(name,value);
}
@Override
public void addHeader(String name, String value)
{
super.addHeader(name, value);
HttpServletResponse response = (HttpServletResponse)getResponse();
if (!response.containsHeader(name))
setHeader(name,value);
}
@Override
protected PrintWriter newWriter(OutputStream out, String encoding) throws UnsupportedEncodingException
{
if (_uncheckedPrintWriter)
return encoding == null?new UncheckedPrintWriter(out):new UncheckedPrintWriter(new OutputStreamWriter(out,encoding));
return super.newWriter(out,encoding);
}
}
}
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