001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.component.http.helper;
018    
019    import java.io.ByteArrayInputStream;
020    import java.io.ByteArrayOutputStream;
021    import java.io.IOException;
022    import java.io.InputStream;
023    import java.util.zip.GZIPInputStream;
024    import java.util.zip.GZIPOutputStream;
025    
026    import org.apache.camel.Exchange;
027    import org.apache.camel.Message;
028    import org.apache.camel.util.ObjectHelper;
029    
030    /**
031     * Helper class to help wrapping content into GZIP input and output streams.
032     */
033    public final class GZIPHelper {
034    
035        private GZIPHelper() {
036        }
037        
038        public static InputStream toGZIPInputStream(String contentEncoding, InputStream in) throws IOException {
039            if (isGzip(contentEncoding)) {
040                return new GZIPInputStream(in);
041            } else {
042                return in;
043            }
044        }
045    
046        public static InputStream toGZIPInputStream(String contentEncoding, byte[] data) throws Exception {
047            if (isGzip(contentEncoding)) {
048                ByteArrayOutputStream os = null;
049                GZIPOutputStream gzip = null;
050                try {
051                    os = new ByteArrayOutputStream();
052                    gzip = new GZIPOutputStream(os);
053                    gzip.write(data);
054                    gzip.finish();
055                    return new ByteArrayInputStream(os.toByteArray());
056                } finally {
057                    ObjectHelper.close(gzip, "gzip", null);
058                    ObjectHelper.close(os, "byte array", null);
059                }
060            } else {
061                return new ByteArrayInputStream(data);
062            }
063        }
064    
065        public static byte[] compressGZIP(byte[] data) throws IOException {
066            ByteArrayOutputStream os = new ByteArrayOutputStream();
067            GZIPOutputStream gzip = new GZIPOutputStream(os);
068            try {
069                gzip.write(data);
070                gzip.finish();
071                return os.toByteArray();
072            } finally {
073                gzip.close();
074                os.close();
075            }
076        }
077    
078        public static boolean isGzip(Message message) {
079            return isGzip(message.getHeader(Exchange.CONTENT_ENCODING, String.class));
080        }
081    
082        public static boolean isGzip(String header) {
083            return header != null && header.toLowerCase().contains("gzip");
084        }
085    
086    }