fc6e668186
Motivation: Add user possibility to skip the evaluation of certain web socket extension, for example we can skip compression extension for messages that already compressed or very small and etc. Modification: This pull request is related with #5669 Result: User can set to WebSocketClientExtensionHandshaker or WebSocketServerExtensionHandshaker a filter to skip the evaluation of certain extension.
97 lines
3.3 KiB
Java
97 lines
3.3 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http.websocketx.extensions.compression;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.ContinuationWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketFrame;
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import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtension;
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import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionFilter;
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import java.util.List;
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/**
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* Per-message implementation of deflate decompressor.
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*/
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class PerMessageDeflateDecoder extends DeflateDecoder {
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private boolean compressing;
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/**
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* Constructor
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*
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* @param noContext true to disable context takeover.
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*/
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PerMessageDeflateDecoder(boolean noContext) {
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super(noContext, WebSocketExtensionFilter.NEVER_SKIP);
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}
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/**
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* Constructor
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*
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* @param noContext true to disable context takeover.
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* @param extensionDecoderFilter extension decoder for per message deflate decoder.
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*/
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PerMessageDeflateDecoder(boolean noContext, WebSocketExtensionFilter extensionDecoderFilter) {
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super(noContext, extensionDecoderFilter);
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}
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@Override
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public boolean acceptInboundMessage(Object msg) throws Exception {
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if (!super.acceptInboundMessage(msg)) {
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return false;
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}
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WebSocketFrame wsFrame = (WebSocketFrame) msg;
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if (extensionDecoderFilter().mustSkip(wsFrame)) {
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if (compressing) {
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throw new IllegalStateException("Cannot skip per message deflate decoder, compression in progress");
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}
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return false;
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}
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return ((wsFrame instanceof TextWebSocketFrame || wsFrame instanceof BinaryWebSocketFrame) &&
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(wsFrame.rsv() & WebSocketExtension.RSV1) > 0) ||
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(wsFrame instanceof ContinuationWebSocketFrame && compressing);
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}
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@Override
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protected int newRsv(WebSocketFrame msg) {
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return (msg.rsv() & WebSocketExtension.RSV1) > 0?
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msg.rsv() ^ WebSocketExtension.RSV1 : msg.rsv();
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}
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@Override
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protected boolean appendFrameTail(WebSocketFrame msg) {
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return msg.isFinalFragment();
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, WebSocketFrame msg,
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List<Object> out) throws Exception {
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super.decode(ctx, msg, out);
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if (msg.isFinalFragment()) {
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compressing = false;
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} else if (msg instanceof TextWebSocketFrame || msg instanceof BinaryWebSocketFrame) {
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compressing = true;
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}
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}
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}
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