104 lines
4.3 KiB
Java
104 lines
4.3 KiB
Java
/*
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* Copyright 2012 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;
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import static io.netty.handler.codec.http.HttpHeaders.isKeepAlive;
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import static io.netty.handler.codec.http.HttpMethod.GET;
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import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN;
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import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelInboundMessageHandlerAdapter;
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import io.netty.channel.ChannelPipeline;
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import io.netty.handler.codec.http.DefaultHttpResponse;
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import io.netty.handler.codec.http.HttpHeaders;
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import io.netty.handler.codec.http.HttpRequest;
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import io.netty.handler.codec.http.HttpResponse;
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import io.netty.handler.ssl.SslHandler;
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import io.netty.logging.InternalLogger;
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import io.netty.logging.InternalLoggerFactory;
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/**
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* Handles the HTTP handshake (the HTTP Upgrade request)
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*/
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public class WebSocketServerProtocolHandshakeHandler extends ChannelInboundMessageHandlerAdapter<HttpRequest> {
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private static final InternalLogger logger =
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InternalLoggerFactory.getInstance(WebSocketServerProtocolHandshakeHandler.class);
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private final String websocketPath;
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private final String subprotocols;
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private final boolean allowExtensions;
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public WebSocketServerProtocolHandshakeHandler(String websocketPath, String subprotocols,
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boolean allowExtensions) {
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this.websocketPath = websocketPath;
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this.subprotocols = subprotocols;
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this.allowExtensions = allowExtensions;
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}
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@Override
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public void messageReceived(final ChannelHandlerContext ctx, HttpRequest req) throws Exception {
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if (req.getMethod() != GET) {
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sendHttpResponse(ctx, req, new DefaultHttpResponse(HTTP_1_1, FORBIDDEN));
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return;
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}
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final WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
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getWebSocketLocation(ctx.pipeline(), req, websocketPath), subprotocols, allowExtensions);
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final WebSocketServerHandshaker handshaker = wsFactory.newHandshaker(req);
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if (handshaker == null) {
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wsFactory.sendUnsupportedWebSocketVersionResponse(ctx.channel());
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} else {
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final ChannelFuture handshakeFuture = handshaker.handshake(ctx.channel(), req);
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handshakeFuture.addListener(new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture future) throws Exception {
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if (!future.isSuccess()) {
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ctx.fireExceptionCaught(future.cause());
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}
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}
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});
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WebSocketServerProtocolHandler.setHandshaker(ctx, handshaker);
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ctx.pipeline().replace(this, "WS403Responder",
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WebSocketServerProtocolHandler.forbiddenHttpRequestResponder());
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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logger.error("Exception Caught", cause);
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ctx.close();
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}
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private static void sendHttpResponse(ChannelHandlerContext ctx, HttpRequest req, HttpResponse res) {
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ChannelFuture f = ctx.channel().write(res);
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if (!isKeepAlive(req) || res.getStatus().getCode() != 200) {
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f.addListener(ChannelFutureListener.CLOSE);
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}
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}
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private static String getWebSocketLocation(ChannelPipeline cp, HttpRequest req, String path) {
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String protocol = "ws";
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if (cp.get(SslHandler.class) != null) {
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// SSL in use so use Secure WebSockets
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protocol = "wss";
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}
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return protocol + "://" + req.getHeader(HttpHeaders.Names.HOST) + path;
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}
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}
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