io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandshakeHandler Maven / Gradle / Ivy
/*
* Copyright 2019 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:
*
* 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 io.netty.handler.codec.http.websocketx;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpObject;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler.ServerHandshakeStateEvent;
import io.netty.handler.ssl.SslHandler;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import java.util.concurrent.TimeUnit;
import static io.netty.handler.codec.http.HttpUtil.*;
import static io.netty.util.internal.ObjectUtil.*;
/**
* Handles the HTTP handshake (the HTTP Upgrade request) for {@link WebSocketServerProtocolHandler}.
*/
class WebSocketServerProtocolHandshakeHandler extends ChannelInboundHandlerAdapter {
private final WebSocketServerProtocolConfig serverConfig;
private ChannelHandlerContext ctx;
private ChannelPromise handshakePromise;
private boolean isWebSocketPath;
WebSocketServerProtocolHandshakeHandler(WebSocketServerProtocolConfig serverConfig) {
this.serverConfig = checkNotNull(serverConfig, "serverConfig");
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) {
this.ctx = ctx;
handshakePromise = ctx.newPromise();
}
@Override
public void channelRead(final ChannelHandlerContext ctx, Object msg) throws Exception {
final HttpObject httpObject = (HttpObject) msg;
if (httpObject instanceof HttpRequest) {
final HttpRequest req = (HttpRequest) httpObject;
isWebSocketPath = isWebSocketPath(req);
if (!isWebSocketPath) {
ctx.fireChannelRead(msg);
return;
}
try {
final WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
getWebSocketLocation(ctx.pipeline(), req, serverConfig.websocketPath()),
serverConfig.subprotocols(), serverConfig.decoderConfig());
final WebSocketServerHandshaker handshaker = wsFactory.newHandshaker(req);
final ChannelPromise localHandshakePromise = handshakePromise;
if (handshaker == null) {
WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
} else {
// Ensure we set the handshaker and replace this handler before we
// trigger the actual handshake. Otherwise we may receive websocket bytes in this handler
// before we had a chance to replace it.
//
// See https://github.com/netty/netty/issues/9471.
WebSocketServerProtocolHandler.setHandshaker(ctx.channel(), handshaker);
ctx.pipeline().remove(this);
final ChannelFuture handshakeFuture = handshaker.handshake(ctx.channel(), req);
handshakeFuture.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) {
if (!future.isSuccess()) {
localHandshakePromise.tryFailure(future.cause());
ctx.fireExceptionCaught(future.cause());
} else {
localHandshakePromise.trySuccess();
// Kept for compatibility
ctx.fireUserEventTriggered(
WebSocketServerProtocolHandler.ServerHandshakeStateEvent.HANDSHAKE_COMPLETE);
ctx.fireUserEventTriggered(
new WebSocketServerProtocolHandler.HandshakeComplete(
req.uri(), req.headers(), handshaker.selectedSubprotocol()));
}
}
});
applyHandshakeTimeout();
}
} finally {
ReferenceCountUtil.release(req);
}
} else if (!isWebSocketPath) {
ctx.fireChannelRead(msg);
} else {
ReferenceCountUtil.release(msg);
}
}
private boolean isWebSocketPath(HttpRequest req) {
String websocketPath = serverConfig.websocketPath();
String uri = req.uri();
return serverConfig.checkStartsWith()
? uri.startsWith(websocketPath) && ("/".equals(websocketPath) || checkNextUri(uri, websocketPath))
: uri.equals(websocketPath);
}
private boolean checkNextUri(String uri, String websocketPath) {
int len = websocketPath.length();
if (uri.length() > len) {
char nextUri = uri.charAt(len);
return nextUri == '/' || nextUri == '?';
}
return true;
}
private static void sendHttpResponse(ChannelHandlerContext ctx, HttpRequest req, HttpResponse res) {
ChannelFuture f = ctx.writeAndFlush(res);
if (!isKeepAlive(req) || res.status().code() != 200) {
f.addListener(ChannelFutureListener.CLOSE);
}
}
private static String getWebSocketLocation(ChannelPipeline cp, HttpRequest req, String path) {
String protocol = "ws";
if (cp.get(SslHandler.class) != null) {
// SSL in use so use Secure WebSockets
protocol = "wss";
}
String host = req.headers().get(HttpHeaderNames.HOST);
return protocol + "://" + host + path;
}
private void applyHandshakeTimeout() {
final ChannelPromise localHandshakePromise = handshakePromise;
final long handshakeTimeoutMillis = serverConfig.handshakeTimeoutMillis();
if (handshakeTimeoutMillis <= 0 || localHandshakePromise.isDone()) {
return;
}
final Future timeoutFuture = ctx.executor().schedule(new Runnable() {
@Override
public void run() {
if (!localHandshakePromise.isDone() &&
localHandshakePromise.tryFailure(new WebSocketServerHandshakeException("handshake timed out"))) {
ctx.flush()
.fireUserEventTriggered(ServerHandshakeStateEvent.HANDSHAKE_TIMEOUT)
.close();
}
}
}, handshakeTimeoutMillis, TimeUnit.MILLISECONDS);
// Cancel the handshake timeout when handshake is finished.
localHandshakePromise.addListener(new FutureListener() {
@Override
public void operationComplete(Future f) {
timeoutFuture.cancel(false);
}
});
}
}