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111 lines
4.4 KiB
111 lines
4.4 KiB
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package org.apache.http.client.protocol;
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import java.io.IOException;
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import java.util.Locale;
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import org.apache.http.Header;
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import org.apache.http.HeaderElement;
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import org.apache.http.HttpEntity;
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import org.apache.http.HttpException;
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import org.apache.http.HttpResponse;
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import org.apache.http.HttpResponseInterceptor;
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import org.apache.http.annotation.Immutable;
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import org.apache.http.client.entity.DeflateDecompressingEntity;
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import org.apache.http.client.entity.GzipDecompressingEntity;
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import org.apache.http.protocol.HttpContext;
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/**
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* {@link HttpResponseInterceptor} responsible for processing Content-Encoding
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* responses.
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* <p>
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* Instances of this class are stateless and immutable, therefore threadsafe.
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*
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* @since 4.1
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*
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*/
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@Immutable
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public class ResponseContentEncoding implements HttpResponseInterceptor {
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public static final String UNCOMPRESSED = "http.client.response.uncompressed";
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/**
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* Handles the following {@code Content-Encoding}s by
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* using the appropriate decompressor to wrap the response Entity:
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* <ul>
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* <li>gzip - see {@link GzipDecompressingEntity}</li>
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* <li>deflate - see {@link DeflateDecompressingEntity}</li>
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* <li>identity - no action needed</li>
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* </ul>
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*
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* @param response the response which contains the entity
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* @param context not currently used
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*
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* @throws HttpException if the {@code Content-Encoding} is none of the above
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*/
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public void process(
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final HttpResponse response,
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final HttpContext context) throws HttpException, IOException {
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final HttpEntity entity = response.getEntity();
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// entity can be null in case of 304 Not Modified, 204 No Content or similar
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// check for zero length entity.
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if (entity != null && entity.getContentLength() != 0) {
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final Header ceheader = entity.getContentEncoding();
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if (ceheader != null) {
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final HeaderElement[] codecs = ceheader.getElements();
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boolean uncompressed = false;
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for (final HeaderElement codec : codecs) {
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final String codecname = codec.getName().toLowerCase(Locale.ENGLISH);
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if ("gzip".equals(codecname) || "x-gzip".equals(codecname)) {
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response.setEntity(new GzipDecompressingEntity(response.getEntity()));
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uncompressed = true;
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break;
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} else if ("deflate".equals(codecname)) {
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response.setEntity(new DeflateDecompressingEntity(response.getEntity()));
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uncompressed = true;
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break;
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} else if ("identity".equals(codecname)) {
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/* Don't need to transform the content - no-op */
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return;
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} else {
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throw new HttpException("Unsupported Content-Coding: " + codec.getName());
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}
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}
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if (uncompressed) {
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response.removeHeaders("Content-Length");
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response.removeHeaders("Content-Encoding");
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response.removeHeaders("Content-MD5");
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}
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}
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}
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}
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}
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