/
HAProxyMessageReader.java
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/
HAProxyMessageReader.java
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/*
* Copyright (c) 2019-2022 VMware, Inc. or its affiliates, All Rights Reserved.
*
* Licensed 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
*
* https://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 reactor.netty5.http.server;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import io.netty5.channel.Channel;
import io.netty5.channel.ChannelHandlerAdapter;
import io.netty5.channel.ChannelHandlerContext;
import io.netty.contrib.handler.codec.haproxy.HAProxyMessage;
import io.netty5.util.AttributeKey;
import reactor.netty5.transport.AddressUtils;
import reactor.util.annotation.Nullable;
/**
* Consumes {@link io.netty.contrib.handler.codec.haproxy.HAProxyMessage}
* and set it into channel attribute for later use.
*
* @author aftersss
*/
final class HAProxyMessageReader extends ChannelHandlerAdapter {
private static final AttributeKey<InetSocketAddress> REMOTE_ADDRESS_FROM_PROXY_PROTOCOL =
AttributeKey.valueOf("remoteAddressFromProxyProtocol");
private static final boolean isProxyProtocolAvailable;
static {
boolean proxyProtocolCheck = true;
try {
Class.forName("io.netty.contrib.handler.codec.haproxy.HAProxyMessageDecoder");
}
catch (ClassNotFoundException cnfe) {
proxyProtocolCheck = false;
}
isProxyProtocolAvailable = proxyProtocolCheck;
}
static boolean isProxyProtocolAvailable() {
return isProxyProtocolAvailable;
}
@Nullable
static SocketAddress resolveRemoteAddressFromProxyProtocol(Channel channel) {
if (HAProxyMessageReader.isProxyProtocolAvailable()) {
return channel.attr(REMOTE_ADDRESS_FROM_PROXY_PROTOCOL).getAndSet(null);
}
return null;
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
if (msg instanceof HAProxyMessage) {
try (HAProxyMessage proxyMessage = (HAProxyMessage) msg) {
if (proxyMessage.sourceAddress() != null && proxyMessage.sourcePort() != 0) {
InetSocketAddress remoteAddress = AddressUtils
.createUnresolved(proxyMessage.sourceAddress(), proxyMessage.sourcePort());
ctx.channel()
.attr(REMOTE_ADDRESS_FROM_PROXY_PROTOCOL)
.set(remoteAddress);
}
}
ctx.channel()
.pipeline()
.remove(this);
ctx.read();
}
else {
super.channelRead(ctx, msg);
}
}
}