| /* |
| * Copyright (c) 2012, 2018 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0, which is available at |
| * http://www.eclipse.org/legal/epl-2.0. |
| * |
| * This Source Code may also be made available under the following Secondary |
| * Licenses when the conditions for such availability set forth in the |
| * Eclipse Public License v. 2.0 are satisfied: GNU General Public License, |
| * version 2 with the GNU Classpath Exception, which is available at |
| * https://www.gnu.org/software/classpath/license.html. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 |
| */ |
| |
| package org.glassfish.jersey.message; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.zip.Deflater; |
| import java.util.zip.DeflaterOutputStream; |
| import java.util.zip.Inflater; |
| import java.util.zip.InflaterInputStream; |
| |
| import javax.annotation.Priority; |
| import javax.ws.rs.Priorities; |
| import javax.ws.rs.core.Configuration; |
| |
| import javax.inject.Inject; |
| |
| import org.glassfish.jersey.spi.ContentEncoder; |
| |
| /** |
| * Deflate encoding support. Interceptor that encodes the output or decodes the input if |
| * {@link javax.ws.rs.core.HttpHeaders#CONTENT_ENCODING Content-Encoding header} value equals to {@code deflate}. |
| * The default behavior of this interceptor can be tweaked using {@link MessageProperties#DEFLATE_WITHOUT_ZLIB} |
| * property. |
| * |
| * @author Martin Matula |
| */ |
| @Priority(Priorities.ENTITY_CODER) |
| public class DeflateEncoder extends ContentEncoder { |
| |
| // TODO This provider should be registered and configured via a feature. |
| private final Configuration config; |
| |
| /** |
| * Initialize DeflateEncoder. |
| * |
| * @param config Jersey configuration properties. |
| */ |
| @Inject |
| public DeflateEncoder(final Configuration config) { |
| super("deflate"); |
| this.config = config; |
| } |
| |
| @Override |
| public InputStream decode(String contentEncoding, InputStream encodedStream) |
| throws IOException { |
| // correct impl. should wrap deflate in zlib, but some don't do it - have to identify, which one we got |
| InputStream markSupportingStream = encodedStream.markSupported() ? encodedStream |
| : new BufferedInputStream(encodedStream); |
| |
| markSupportingStream.mark(1); |
| // read the first byte |
| int firstByte = markSupportingStream.read(); |
| markSupportingStream.reset(); |
| |
| // if using zlib, first 3 bits should be 0, 4th should be 1 |
| // that should never be the case if no zlib wrapper |
| if ((firstByte & 15) == 8) { |
| // ok, zlib wrapped stream |
| return new InflaterInputStream(markSupportingStream); |
| } else { |
| // no zlib wrapper |
| return new InflaterInputStream(markSupportingStream, new Inflater(true)); |
| } |
| } |
| |
| @Override |
| public OutputStream encode(String contentEncoding, OutputStream entityStream) |
| throws IOException { |
| // some implementations don't support the correct deflate |
| // so we have a property to configure the incorrect deflate (no zlib wrapper) should be used |
| // let's check that |
| Object value = config.getProperty(MessageProperties.DEFLATE_WITHOUT_ZLIB); |
| boolean deflateWithoutZLib; |
| if (value instanceof String) { |
| deflateWithoutZLib = Boolean.valueOf((String) value); |
| } else if (value instanceof Boolean) { |
| deflateWithoutZLib = (Boolean) value; |
| } else { |
| deflateWithoutZLib = false; |
| } |
| |
| return deflateWithoutZLib |
| ? new DeflaterOutputStream(entityStream, new Deflater(Deflater.DEFAULT_COMPRESSION, true)) |
| : new DeflaterOutputStream(entityStream); |
| } |
| } |