/*
* @(#)TransferEncodingModule.java 0.3-3 06/05/2001
*
* This file is part of the HTTPClient package
* Copyright (C) 1996-2001 Ronald Tschal�r
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307, USA
*
* For questions, suggestions, bug-reports, enhancement-requests etc.
* I may be contacted at:
*
* ronald@innovation.ch
*
* The HTTPClient's home page is located at:
*
* http://www.innovation.ch/java/HTTPClient/
*
*/
package HTTPClient;
import java.io.IOException;
import java.util.Vector;
import java.util.zip.InflaterInputStream;
import java.util.zip.GZIPInputStream;
/**
* This module handles the TransferEncoding response header. It currently
* handles the "gzip", "deflate", "compress", "chunked" and "identity"
* tokens.
*
* @version 0.3-3 06/05/2001
* @author Ronald Tschal�r
*/
class TransferEncodingModule implements HTTPClientModule
{
// Methods
/**
* Invoked by the HTTPClient.
*/
public int requestHandler(Request req, Response[] resp)
throws ModuleException
{
// Parse TE header
int idx;
NVPair[] hdrs = req.getHeaders();
for (idx=0; idx<hdrs.length; idx++)
if (hdrs[idx].getName().equalsIgnoreCase("TE"))
break;
Vector pte;
if (idx == hdrs.length)
{
hdrs = Util.resizeArray(hdrs, idx+1);
req.setHeaders(hdrs);
pte = new Vector();
}
else
{
try
{ pte = Util.parseHeader(hdrs[idx].getValue()); }
catch (ParseException pe)
{ throw new ModuleException(pe.toString()); }
}
// done if "*;q=1.0" present
HttpHeaderElement all = Util.getElement(pte, "*");
if (all != null)
{
NVPair[] params = all.getParams();
for (idx=0; idx<params.length; idx++)
if (params[idx].getName().equalsIgnoreCase("q")) break;
if (idx == params.length) // no qvalue, i.e. q=1.0
return REQ_CONTINUE;
if (params[idx].getValue() == null ||
params[idx].getValue().length() == 0)
throw new ModuleException("Invalid q value for \"*\" in TE " +
"header: ");
try
{
if (Float.valueOf(params[idx].getValue()).floatValue() > 0.)
return REQ_CONTINUE;
}
catch (NumberFormatException nfe)
{
throw new ModuleException("Invalid q value for \"*\" in TE " +
"header: " + nfe.getMessage());
}
}
// Add gzip, deflate, and compress tokens to the TE header
if (!pte.contains(new HttpHeaderElement("deflate")))
pte.addElement(new HttpHeaderElement("deflate"));
if (!pte.contains(new HttpHeaderElement("gzip")))
pte.addElement(new HttpHeaderElement("gzip"));
if (!pte.contains(new HttpHeaderElement("compress")))
pte.addElement(new HttpHeaderElement("compress"));
hdrs[idx] = new NVPair("TE", Util.assembleHeader(pte));
return REQ_CONTINUE;
}
/**
* Invoked by the HTTPClient.
*/
public void responsePhase1Handler(Response resp, RoRequest req)
{
}
/**
* Invoked by the HTTPClient.
*/
public int responsePhase2Handler(Response resp, Request req)
{
return RSP_CONTINUE;
}
/**
* Invoked by the HTTPClient.
*/
public void responsePhase3Handler(Response resp, RoRequest req)
throws IOException, ModuleException
{
String te = resp.getHeader("Transfer-Encoding");
if (te == null || req.getMethod().equals("HEAD"))
return;
Vector pte;
try
{ pte = Util.parseHeader(te); }
catch (ParseException pe)
{ throw new ModuleException(pe.toString()); }
while (pte.size() > 0)
{
String encoding = ((HttpHeaderElement) pte.lastElement()).getName();
if (encoding.equalsIgnoreCase("gzip"))
{
Log.write(Log.MODS, "TEM: pushing gzip-input-stream");
resp.inp_stream = new GZIPInputStream(resp.inp_stream);
}
else if (encoding.equalsIgnoreCase("deflate"))
{
Log.write(Log.MODS, "TEM: pushing inflater-input-stream");
resp.inp_stream = new InflaterInputStream(resp.inp_stream);
}
else if (encoding.equalsIgnoreCase("compress"))
{
Log.write(Log.MODS, "TEM: pushing uncompress-input-stream");
resp.inp_stream = new UncompressInputStream(resp.inp_stream);
}
else if (encoding.equalsIgnoreCase("chunked"))
{
Log.write(Log.MODS, "TEM: pushing chunked-input-stream");
resp.inp_stream = new ChunkedInputStream(resp.inp_stream);
}
else if (encoding.equalsIgnoreCase("identity"))
{
Log.write(Log.MODS, "TEM: ignoring 'identity' token");
}
else
{
Log.write(Log.MODS, "TEM: Unknown transfer encoding '" +
encoding + "'");
break;
}
pte.removeElementAt(pte.size()-1);
}
if (pte.size() > 0)
resp.setHeader("Transfer-Encoding", Util.assembleHeader(pte));
else
resp.deleteHeader("Transfer-Encoding");
}
/**
* Invoked by the HTTPClient.
*/
public void trailerHandler(Response resp, RoRequest req)
{
}
}