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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   *
   * Copyright (c) 2010-2012 Oracle and/or its affiliates. All rights reserved.
   *
   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
  * obtain a copy of the License at
  * http://glassfish.java.net/public/CDDL+GPL_1_1.html
  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
  *
  * When distributing the software, include this License Header Notice in each
  * file and include the License file at packager/legal/LICENSE.txt.
  *
  * GPL Classpath Exception:
  * Oracle designates this particular file as subject to the "Classpath"
  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
  *
  * Modifications:
  * If applicable, add the following below the License Header, with the fields
  * enclosed by brackets [] replaced by your own identifying information:
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  *
  * Contributor(s):
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  * recipient has the option to distribute your version of this file under
  * either the CDDL, the GPL Version 2 or to extend the choice of license to
  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
  */
 package com.sun.jersey.api.container.filter;
 
 
 
A GZIP content encoding filter.

If the request contains a Content-Encoding header of "gzip" then the request entity (if any) is uncompressed using gzip. If the request contains an Accept-Encoding header containing "gzip" and an "If-None-Match" Header, entitytag value is checked: if it contains the -gzip suffix, remove this suffix, otherwise, completely remove the "if-none-match" header.

If the request contains a Accept-Encoding header that contains "gzip" then the response entity (if any) is compressed using gzip and a Content-Encoding header of "gzip" is added to the response. As this filter is active, the resource representation can be compressed. the value "Accept-Encoding" is so added to the Vary header. If any entityTag is used and content may be gzipped, the "-gzip" suffix is added to entitytag value.

When an application is deployed as a Servlet or Filter this Jersey filter can be registered using the following initialization parameters:

     <init-param>
         <param-name>com.sun.jersey.spi.container.ContainerRequestFilters</param-name>
         <param-value>com.sun.jersey.api.container.filter.GZIPContentEncodingFilter</param-value>
     </init-param&gt
     <init-param&gt
         <param-name>com.sun.jersey.spi.container.ContainerResponseFilters</param-name>
         <param-value>com.sun.jersey.api.container.filter.GZIPContentEncodingFilter</param-value>
     </init-param>
 
Note that if you're using Entitag for cache control and want to use this filter, you shoud add this filter to both ContainerFilters (Request and Response).

Author(s):
Paul Sandoz
Edouard Chevalier
See also:
com.sun.jersey.api.container.filter
 
 
     private static final String ENTITY_TAG_GZIP_SUFFIX_VALUE = "-gzip";
     private static final String ENTITY_TAG_GZIP_SUFFIX_HEADER_VALUE = "-gzip\""// Entity tag raw values always finish with a quotation mark within http headers.
 
     public ContainerRequest filter(ContainerRequest request) {
         String contentEncoding = request.getRequestHeaders().getFirst(.);
         if (contentEncoding != null && contentEncoding.trim().equals("gzip")) {
             request.getRequestHeaders().remove(.);
             try {
                 request.setEntityInputStream(
                        new GZIPInputStream(request.getEntityInputStream()));
            } catch (IOException ex) {
                throw new ContainerException(ex);
            }
        }
        // Check for entity tag header 'If-None-Match' in case of accept-encoding = gzip
        String acceptEncoding = request.getRequestHeaders().getFirst(.);
        String entityTag = request.getRequestHeaders().getFirst(.);
        if (acceptEncoding != null && acceptEncoding.contains("gzip") && entityTag != null) {
            // normalize entitytag (Note: maybe it should check whether it ends with a quotation mark ?)
            if (entityTag.endsWith()) {
                final int gzipsuffixbeginIndex = entityTag.lastIndexOf();
                final StringBuilder sb = new StringBuilder();
                sb.append(entityTag.substring(0, gzipsuffixbeginIndex));
                sb.append('\"');
                request.getRequestHeaders().putSingle(.sb.toString());
            } else {
                // otherwise, remove if-none-match header
                request.getRequestHeaders().remove(.);
            }
        }
        return request;
    }
    private static final class Adapter implements ContainerResponseWriter {
        private final ContainerResponseWriter crw;
        private GZIPOutputStream gos;
        Adapter(ContainerResponseWriter crw) {
            this. = crw;
        }
        public OutputStream writeStatusAndHeaders(long contentLengthContainerResponse responsethrows IOException {
             = new GZIPOutputStream(.writeStatusAndHeaders(-1, response));
            return ;
        }
        public void finish() throws IOException {
            .finish();
            .finish();
        }
    }
    public ContainerResponse filter(ContainerRequest requestContainerResponse response) {
        response.getHttpHeaders().add(..); // add vary header
        String acceptEncoding = request.getRequestHeaders().getFirst(.);
        String contentEncoding = (Stringresponse.getHttpHeaders().getFirst(.);
        if (acceptEncoding != null && contentEncoding == null && acceptEncoding.contains("gzip")) {
            // Check EntityTag header
            if (response.getHttpHeaders().containsKey(.)) {
                EntityTag entityTag = (EntityTagresponse.getHttpHeaders().getFirst(.);
                if (entityTag != null) {
                    response.getHttpHeaders().putSingle(.new EntityTag(entityTag.getValue()
                            + entityTag.isWeak()));
                }
            }
            // wrap entity with gzip
            if (response.getEntity() != null) {
                response.getHttpHeaders().add(."gzip");
                response.setContainerResponseWriter(new Adapter(response.getContainerResponseWriter()));
            }
        }
        return response;
    }
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