110 lines
4.6 KiB
Java
110 lines
4.6 KiB
Java
/*
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* Copyright 2017 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.http2;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufUtil;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerAdapter;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.ByteToMessageDecoder;
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import io.netty.handler.codec.http.HttpServerCodec;
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import io.netty.handler.codec.http.HttpServerUpgradeHandler;
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import io.netty.util.internal.UnstableApi;
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import static io.netty.buffer.Unpooled.unreleasableBuffer;
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import static io.netty.handler.codec.http2.Http2CodecUtil.connectionPrefaceBuf;
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import static java.util.Objects.requireNonNull;
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/**
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* Performing cleartext upgrade, by h2c HTTP upgrade or Prior Knowledge.
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* This handler config pipeline for h2c upgrade when handler added.
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* And will update pipeline once it detect the connection is starting HTTP/2 by
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* prior knowledge or not.
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*/
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@UnstableApi
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public final class CleartextHttp2ServerUpgradeHandler extends ChannelHandlerAdapter {
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private static final ByteBuf CONNECTION_PREFACE = unreleasableBuffer(connectionPrefaceBuf());
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private final HttpServerCodec httpServerCodec;
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private final HttpServerUpgradeHandler httpServerUpgradeHandler;
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private final ChannelHandler http2ServerHandler;
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/**
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* Creates the channel handler provide cleartext HTTP/2 upgrade from HTTP
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* upgrade or prior knowledge
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*
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* @param httpServerCodec the http server codec
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* @param httpServerUpgradeHandler the http server upgrade handler for HTTP/2
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* @param http2ServerHandler the http2 server handler, will be added into pipeline
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* when starting HTTP/2 by prior knowledge
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*/
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public CleartextHttp2ServerUpgradeHandler(HttpServerCodec httpServerCodec,
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HttpServerUpgradeHandler httpServerUpgradeHandler,
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ChannelHandler http2ServerHandler) {
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this.httpServerCodec = requireNonNull(httpServerCodec, "httpServerCodec");
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this.httpServerUpgradeHandler = requireNonNull(httpServerUpgradeHandler, "httpServerUpgradeHandler");
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this.http2ServerHandler = requireNonNull(http2ServerHandler, "http2ServerHandler");
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}
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@Override
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public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
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ctx.pipeline()
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.addBefore(ctx.name(), null, new PriorKnowledgeHandler())
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.addBefore(ctx.name(), null, httpServerCodec)
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.replace(this, null, httpServerUpgradeHandler);
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}
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/**
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* Peek inbound message to determine current connection wants to start HTTP/2
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* by HTTP upgrade or prior knowledge
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*/
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private final class PriorKnowledgeHandler extends ByteToMessageDecoder {
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
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int prefaceLength = CONNECTION_PREFACE.readableBytes();
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int bytesRead = Math.min(in.readableBytes(), prefaceLength);
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if (!ByteBufUtil.equals(CONNECTION_PREFACE, CONNECTION_PREFACE.readerIndex(),
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in, in.readerIndex(), bytesRead)) {
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ctx.pipeline().remove(this);
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} else if (bytesRead == prefaceLength) {
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// Full h2 preface match, removed source codec, using http2 codec to handle
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// following network traffic
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ctx.pipeline()
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.remove(httpServerCodec)
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.remove(httpServerUpgradeHandler);
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ctx.pipeline().addAfter(ctx.name(), null, http2ServerHandler);
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ctx.pipeline().remove(this);
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ctx.fireUserEventTriggered(PriorKnowledgeUpgradeEvent.INSTANCE);
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}
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}
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}
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/**
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* User event that is fired to notify about HTTP/2 protocol is started.
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*/
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public static final class PriorKnowledgeUpgradeEvent {
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private static final PriorKnowledgeUpgradeEvent INSTANCE = new PriorKnowledgeUpgradeEvent();
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private PriorKnowledgeUpgradeEvent() {
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}
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}
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}
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