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/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */
package org.apache.http.client.protocol;

import java.io.IOException;
import java.util.Locale;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.DecompressingEntity;
import org.apache.http.client.entity.DeflateInputStreamFactory;
import org.apache.http.client.entity.GZIPInputStreamFactory;
import org.apache.http.client.entity.InputStreamFactory;
import org.apache.http.config.Lookup;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.protocol.HttpContext;

/**
 * {@link HttpResponseInterceptor} responsible for processing Content-Encoding
 * responses.
 * 

* Instances of this class are stateless and immutable, therefore threadsafe. * * @since 4.1 * */ @Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL) public class ResponseContentEncoding implements HttpResponseInterceptor { public static final String UNCOMPRESSED = "http.client.response.uncompressed"; private final Lookup decoderRegistry; private final boolean ignoreUnknown; /** * @since 4.5 */ public ResponseContentEncoding(final Lookup decoderRegistry, final boolean ignoreUnknown) { this.decoderRegistry = decoderRegistry != null ? decoderRegistry : RegistryBuilder.create() .register("gzip", GZIPInputStreamFactory.getInstance()) .register("x-gzip", GZIPInputStreamFactory.getInstance()) .register("deflate", DeflateInputStreamFactory.getInstance()) .build(); this.ignoreUnknown = ignoreUnknown; } /** * @since 4.5 */ public ResponseContentEncoding(final boolean ignoreUnknown) { this(null, ignoreUnknown); } /** * @since 4.4 */ public ResponseContentEncoding(final Lookup decoderRegistry) { this(decoderRegistry, true); } /** * Handles {@code gzip} and {@code deflate} compressed entities by using the following * decoders: *

    *
  • gzip - see {@link java.util.zip.GZIPInputStream}
  • *
  • deflate - see {@link org.apache.http.client.entity.DeflateInputStream}
  • *
*/ public ResponseContentEncoding() { this(null); } @Override public void process( final HttpResponse response, final HttpContext context) throws HttpException, IOException { final HttpEntity entity = response.getEntity(); final HttpClientContext clientContext = HttpClientContext.adapt(context); final RequestConfig requestConfig = clientContext.getRequestConfig(); // entity can be null in case of 304 Not Modified, 204 No Content or similar // check for zero length entity. if (requestConfig.isContentCompressionEnabled() && entity != null && entity.getContentLength() != 0) { final Header ceheader = entity.getContentEncoding(); if (ceheader != null) { final HeaderElement[] codecs = ceheader.getElements(); for (final HeaderElement codec : codecs) { final String codecname = codec.getName().toLowerCase(Locale.ROOT); final InputStreamFactory decoderFactory = decoderRegistry.lookup(codecname); if (decoderFactory != null) { response.setEntity(new DecompressingEntity(response.getEntity(), decoderFactory)); response.removeHeaders("Content-Length"); response.removeHeaders("Content-Encoding"); response.removeHeaders("Content-MD5"); } else { if (!"identity".equals(codecname) && !ignoreUnknown) { throw new HttpException("Unsupported Content-Encoding: " + codec.getName()); } } } } } } }




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