126 lines
5.5 KiB
Java
126 lines
5.5 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 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.ChannelInboundHandlerAdapter;
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import io.netty.channel.ChannelPipeline;
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import io.netty.handler.codec.http.DefaultFullHttpResponse;
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import io.netty.handler.codec.http.FullHttpRequest;
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import io.netty.handler.codec.http.HttpHeaderNames;
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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 static io.netty.handler.codec.http.HttpUtil.*;
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import static io.netty.handler.codec.http.HttpMethod.*;
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import static io.netty.handler.codec.http.HttpResponseStatus.*;
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import static io.netty.handler.codec.http.HttpVersion.*;
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/**
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* Handles the HTTP handshake (the HTTP Upgrade request) for {@link WebSocketServerProtocolHandler}.
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*/
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class WebSocketServerProtocolHandshakeHandler extends ChannelInboundHandlerAdapter {
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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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private final int maxFramePayloadSize;
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private final boolean allowMaskMismatch;
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private final boolean checkStartsWith;
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WebSocketServerProtocolHandshakeHandler(String websocketPath, String subprotocols,
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boolean allowExtensions, int maxFrameSize, boolean allowMaskMismatch) {
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this(websocketPath, subprotocols, allowExtensions, maxFrameSize, allowMaskMismatch, false);
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}
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WebSocketServerProtocolHandshakeHandler(String websocketPath, String subprotocols,
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boolean allowExtensions, int maxFrameSize, boolean allowMaskMismatch, boolean checkStartsWith) {
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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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maxFramePayloadSize = maxFrameSize;
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this.allowMaskMismatch = allowMaskMismatch;
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this.checkStartsWith = checkStartsWith;
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}
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@Override
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public void channelRead(final ChannelHandlerContext ctx, Object msg) throws Exception {
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final FullHttpRequest req = (FullHttpRequest) msg;
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if (isNotWebSocketPath(req)) {
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ctx.fireChannelRead(msg);
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return;
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}
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try {
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if (req.method() != GET) {
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sendHttpResponse(ctx, req, new DefaultFullHttpResponse(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,
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allowExtensions, maxFramePayloadSize, allowMaskMismatch);
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final WebSocketServerHandshaker handshaker = wsFactory.newHandshaker(req);
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if (handshaker == null) {
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WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(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((ChannelFutureListener) future -> {
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if (!future.isSuccess()) {
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ctx.fireExceptionCaught(future.cause());
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} else {
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// Kept for compatibility
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ctx.fireUserEventTriggered(
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WebSocketServerProtocolHandler.ServerHandshakeStateEvent.HANDSHAKE_COMPLETE);
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ctx.fireUserEventTriggered(
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new WebSocketServerProtocolHandler.HandshakeComplete(
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req.uri(), req.headers(), handshaker.selectedSubprotocol()));
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}
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});
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WebSocketServerProtocolHandler.setHandshaker(ctx.channel(), handshaker);
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ctx.pipeline().replace(this, "WS403Responder",
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WebSocketServerProtocolHandler.forbiddenHttpRequestResponder());
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}
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} finally {
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req.release();
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}
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}
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private boolean isNotWebSocketPath(FullHttpRequest req) {
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return checkStartsWith ? !req.uri().startsWith(websocketPath) : !req.uri().equals(websocketPath);
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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().writeAndFlush(res);
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if (!isKeepAlive(req) || res.status().code() != 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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String host = req.headers().get(HttpHeaderNames.HOST);
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return protocol + "://" + host + path;
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}
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}
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