/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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.
*/
package io.netty.handler.codec.http;
import io.netty.channel.embedded.EmbeddedChannel;
import io.netty.handler.codec.AsciiString;
import io.netty.handler.codec.compression.ZlibCodecFactory;
import io.netty.handler.codec.compression.ZlibWrapper;
/**
* Decompresses an {@link HttpMessage} and an {@link HttpContent} compressed in
* {@code gzip} or {@code deflate} encoding. For more information on how this
* handler modifies the message, please refer to {@link HttpContentDecoder}.
*/
public class HttpContentDecompressor extends HttpContentDecoder {
/**
* {@code "x-deflate"}
*/
private static final AsciiString X_DEFLATE = new AsciiString("x-deflate");
/**
* {@code "x-gzip"}
*/
private static final AsciiString X_GZIP = new AsciiString("x-gzip");
private final boolean strict;
/**
* Create a new {@link HttpContentDecompressor} in non-strict mode.
*/
public HttpContentDecompressor() {
this(false);
}
/**
* Create a new {@link HttpContentDecompressor}.
*
* @param strict if {@code true} use strict handling of deflate if used, otherwise handle it in a
* more lenient fashion.
*/
public HttpContentDecompressor(boolean strict) {
this.strict = strict;
}
@Override
protected EmbeddedChannel newContentDecoder(String contentEncoding) throws Exception {
if (HttpHeaderValues.GZIP.equalsIgnoreCase(contentEncoding) ||
X_GZIP.equalsIgnoreCase(contentEncoding)) {
return new EmbeddedChannel(ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
}
if (HttpHeaderValues.DEFLATE.equalsIgnoreCase(contentEncoding) ||
X_DEFLATE.equalsIgnoreCase(contentEncoding)) {
final ZlibWrapper wrapper = strict ? ZlibWrapper.ZLIB : ZlibWrapper.ZLIB_OR_NONE;
// To be strict, 'deflate' means ZLIB, but some servers were not implemented correctly.
return new EmbeddedChannel(ZlibCodecFactory.newZlibDecoder(wrapper));
}
// 'identity' or unsupported
return null;
}
}