1 /*
2 * Copyright 2012 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.handler.codec.http;
17
18 import io.netty.channel.embedded.EmbeddedChannel;
19 import io.netty.handler.codec.compression.ZlibCodecFactory;
20 import io.netty.handler.codec.compression.ZlibWrapper;
21
22 /**
23 * Decompresses an {@link HttpMessage} and an {@link HttpContent} compressed in
24 * {@code gzip} or {@code deflate} encoding. For more information on how this
25 * handler modifies the message, please refer to {@link HttpContentDecoder}.
26 */
27 public class HttpContentDecompressor extends HttpContentDecoder {
28
29 private final boolean strict;
30
31 /**
32 * Create a new {@link HttpContentDecompressor} in non-strict mode.
33 */
34 public HttpContentDecompressor() {
35 this(false);
36 }
37
38 /**
39 * Create a new {@link HttpContentDecompressor}.
40 *
41 * @param strict if {@code true} use strict handling of deflate if used, otherwise handle it in a
42 * more lenient fashion.
43 */
44 public HttpContentDecompressor(boolean strict) {
45 this.strict = strict;
46 }
47
48 @Override
49 protected EmbeddedChannel newContentDecoder(String contentEncoding) throws Exception {
50 if ("gzip".equalsIgnoreCase(contentEncoding) || "x-gzip".equalsIgnoreCase(contentEncoding)) {
51 return new EmbeddedChannel(ctx.channel().metadata().hasDisconnect(),
52 ctx.channel().config(), ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
53 }
54 if ("deflate".equalsIgnoreCase(contentEncoding) || "x-deflate".equalsIgnoreCase(contentEncoding)) {
55 ZlibWrapper wrapper;
56 if (strict) {
57 wrapper = ZlibWrapper.ZLIB;
58 } else {
59 wrapper = ZlibWrapper.ZLIB_OR_NONE;
60 }
61 // To be strict, 'deflate' means ZLIB, but some servers were not implemented correctly.
62 return new EmbeddedChannel(ctx.channel().metadata().hasDisconnect(),
63 ctx.channel().config(), ZlibCodecFactory.newZlibDecoder(wrapper));
64 }
65
66 // 'identity' or unsupported
67 return null;
68 }
69 }