| // |
| // ======================================================================== |
| // Copyright (c) 1995-2014 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.io.OutputStreamWriter; |
| import java.io.PrintWriter; |
| import java.io.UnsupportedEncodingException; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.StringTokenizer; |
| import java.util.zip.DeflaterOutputStream; |
| import java.util.zip.GZIPOutputStream; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.eclipse.jetty.continuation.Continuation; |
| import org.eclipse.jetty.continuation.ContinuationListener; |
| import org.eclipse.jetty.continuation.ContinuationSupport; |
| import org.eclipse.jetty.http.HttpMethods; |
| import org.eclipse.jetty.http.gzip.CompressedResponseWrapper; |
| import org.eclipse.jetty.http.gzip.AbstractCompressedStream; |
| import org.eclipse.jetty.server.Request; |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * GZIP Handler This handler will gzip the content of a response if: |
| * <ul> |
| * <li>The filter is mapped to a matching path</li> |
| * <li>The response status code is >=200 and <300 |
| * <li>The content length is unknown or more than the <code>minGzipSize</code> initParameter or the minGzipSize is 0(default)</li> |
| * <li>The content-type is in the comma separated list of mimeTypes set in the <code>mimeTypes</code> initParameter or if no mimeTypes are defined the |
| * content-type is not "application/gzip"</li> |
| * <li>No content-encoding is specified by the resource</li> |
| * </ul> |
| * |
| * <p> |
| * Compressing the content can greatly improve the network bandwidth usage, but at a cost of memory and CPU cycles. If this handler is used for static content, |
| * then use of efficient direct NIO may be prevented, thus use of the gzip mechanism of the <code>org.eclipse.jetty.servlet.DefaultServlet</code> is advised instead. |
| * </p> |
| */ |
| public class GzipHandler extends HandlerWrapper |
| { |
| private static final Logger LOG = Log.getLogger(GzipHandler.class); |
| |
| protected Set<String> _mimeTypes; |
| protected Set<String> _excluded; |
| protected int _bufferSize = 8192; |
| protected int _minGzipSize = 256; |
| protected String _vary = "Accept-Encoding, User-Agent"; |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Instantiates a new gzip handler. |
| */ |
| public GzipHandler() |
| { |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Get the mime types. |
| * |
| * @return mime types to set |
| */ |
| public Set<String> getMimeTypes() |
| { |
| return _mimeTypes; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Set the mime types. |
| * |
| * @param mimeTypes |
| * the mime types to set |
| */ |
| public void setMimeTypes(Set<String> mimeTypes) |
| { |
| _mimeTypes = mimeTypes; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Set the mime types. |
| * |
| * @param mimeTypes |
| * the mime types to set |
| */ |
| public void setMimeTypes(String mimeTypes) |
| { |
| if (mimeTypes != null) |
| { |
| _mimeTypes = new HashSet<String>(); |
| StringTokenizer tok = new StringTokenizer(mimeTypes,",",false); |
| while (tok.hasMoreTokens()) |
| { |
| _mimeTypes.add(tok.nextToken()); |
| } |
| } |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Get the excluded user agents. |
| * |
| * @return excluded user agents |
| */ |
| public Set<String> getExcluded() |
| { |
| return _excluded; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Set the excluded user agents. |
| * |
| * @param excluded |
| * excluded user agents to set |
| */ |
| public void setExcluded(Set<String> excluded) |
| { |
| _excluded = excluded; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Set the excluded user agents. |
| * |
| * @param excluded |
| * excluded user agents to set |
| */ |
| public void setExcluded(String excluded) |
| { |
| if (excluded != null) |
| { |
| _excluded = new HashSet<String>(); |
| StringTokenizer tok = new StringTokenizer(excluded,",",false); |
| while (tok.hasMoreTokens()) |
| _excluded.add(tok.nextToken()); |
| } |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * @return The value of the Vary header set if a response can be compressed. |
| */ |
| public String getVary() |
| { |
| return _vary; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Set the value of the Vary header sent with responses that could be compressed. |
| * <p> |
| * By default it is set to 'Accept-Encoding, User-Agent' since IE6 is excluded by |
| * default from the excludedAgents. If user-agents are not to be excluded, then |
| * this can be set to 'Accept-Encoding'. Note also that shared caches may cache |
| * many copies of a resource that is varied by User-Agent - one per variation of the |
| * User-Agent, unless the cache does some normalization of the UA string. |
| * @param vary The value of the Vary header set if a response can be compressed. |
| */ |
| public void setVary(String vary) |
| { |
| _vary = vary; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Get the buffer size. |
| * |
| * @return the buffer size |
| */ |
| public int getBufferSize() |
| { |
| return _bufferSize; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Set the buffer size. |
| * |
| * @param bufferSize |
| * buffer size to set |
| */ |
| public void setBufferSize(int bufferSize) |
| { |
| _bufferSize = bufferSize; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Get the minimum reponse size. |
| * |
| * @return minimum reponse size |
| */ |
| public int getMinGzipSize() |
| { |
| return _minGzipSize; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Set the minimum reponse size. |
| * |
| * @param minGzipSize |
| * minimum reponse size |
| */ |
| public void setMinGzipSize(int minGzipSize) |
| { |
| _minGzipSize = minGzipSize; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * @see org.eclipse.jetty.server.handler.HandlerWrapper#handle(java.lang.String, org.eclipse.jetty.server.Request, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) |
| */ |
| @Override |
| public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException |
| { |
| if (_handler!=null && isStarted()) |
| { |
| String ae = request.getHeader("accept-encoding"); |
| if (ae != null && ae.indexOf("gzip")>=0 && !response.containsHeader("Content-Encoding") |
| && !HttpMethods.HEAD.equalsIgnoreCase(request.getMethod())) |
| { |
| if (_excluded!=null) |
| { |
| String ua = request.getHeader("User-Agent"); |
| if (_excluded.contains(ua)) |
| { |
| _handler.handle(target,baseRequest, request, response); |
| return; |
| } |
| } |
| |
| final CompressedResponseWrapper wrappedResponse = newGzipResponseWrapper(request,response); |
| |
| boolean exceptional=true; |
| try |
| { |
| _handler.handle(target, baseRequest, request, wrappedResponse); |
| exceptional=false; |
| } |
| finally |
| { |
| Continuation continuation = ContinuationSupport.getContinuation(request); |
| if (continuation.isSuspended() && continuation.isResponseWrapped()) |
| { |
| continuation.addContinuationListener(new ContinuationListener() |
| { |
| public void onComplete(Continuation continuation) |
| { |
| try |
| { |
| wrappedResponse.finish(); |
| } |
| catch(IOException e) |
| { |
| LOG.warn(e); |
| } |
| } |
| |
| public void onTimeout(Continuation continuation) |
| {} |
| }); |
| } |
| else if (exceptional && !response.isCommitted()) |
| { |
| wrappedResponse.resetBuffer(); |
| wrappedResponse.noCompression(); |
| } |
| else |
| wrappedResponse.finish(); |
| } |
| } |
| else |
| { |
| _handler.handle(target,baseRequest, request, response); |
| } |
| } |
| } |
| |
| /** |
| * Allows derived implementations to replace ResponseWrapper implementation. |
| * |
| * @param request the request |
| * @param response the response |
| * @return the gzip response wrapper |
| */ |
| protected CompressedResponseWrapper newGzipResponseWrapper(HttpServletRequest request, HttpServletResponse response) |
| { |
| return new CompressedResponseWrapper(request,response) |
| { |
| { |
| super.setMimeTypes(GzipHandler.this._mimeTypes); |
| super.setBufferSize(GzipHandler.this._bufferSize); |
| super.setMinCompressSize(GzipHandler.this._minGzipSize); |
| } |
| |
| @Override |
| protected AbstractCompressedStream newCompressedStream(HttpServletRequest request,HttpServletResponse response) throws IOException |
| { |
| return new AbstractCompressedStream("gzip",request,this,_vary) |
| { |
| @Override |
| protected DeflaterOutputStream createStream() throws IOException |
| { |
| return new GZIPOutputStream(_response.getOutputStream(),_bufferSize); |
| } |
| }; |
| } |
| |
| @Override |
| protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException |
| { |
| return GzipHandler.this.newWriter(out,encoding); |
| } |
| }; |
| } |
| |
| /** |
| * Allows derived implementations to replace PrintWriter implementation. |
| * |
| * @param out the out |
| * @param encoding the encoding |
| * @return the prints the writer |
| * @throws UnsupportedEncodingException |
| */ |
| protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException |
| { |
| return encoding==null?new PrintWriter(out):new PrintWriter(new OutputStreamWriter(out,encoding)); |
| } |
| } |