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115
.../src/main/java/io/netty/handler/codec/http/websocketx/WebSocketServerProtocolHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| /* | ||
| * Copyright 2012 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: | ||
| * | ||
| * http://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 static io.netty.handler.codec.http.HttpVersion.HTTP_1_1; | ||
| import io.netty.buffer.Unpooled; | ||
| import io.netty.channel.ChannelFutureListener; | ||
| import io.netty.channel.ChannelHandler; | ||
| import io.netty.channel.ChannelHandlerContext; | ||
| import io.netty.channel.ChannelInboundMessageHandlerAdapter; | ||
| import io.netty.channel.ChannelPipeline; | ||
| import io.netty.handler.codec.http.DefaultHttpResponse; | ||
| import io.netty.handler.codec.http.HttpResponseStatus; | ||
| import io.netty.util.AttributeKey; | ||
|
|
||
| /** | ||
| * Handles WebSocket control frames (Close, Ping, Pong) and data frames (Text and Binary) are passed | ||
| * to the next handler in the pipeline. | ||
| */ | ||
| public class WebSocketServerProtocolHandler extends ChannelInboundMessageHandlerAdapter<WebSocketFrame> { | ||
|
|
||
| private static final AttributeKey<WebSocketServerHandshaker> HANDSHAKER_ATTR_KEY = | ||
| new AttributeKey<WebSocketServerHandshaker>(WebSocketServerHandshaker.class.getName()); | ||
|
|
||
| private final String websocketPath; | ||
| private final String subprotocols; | ||
| private final boolean allowExtensions; | ||
|
|
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| public WebSocketServerProtocolHandler(String websocketPath) { | ||
| this(websocketPath, null, false); | ||
| } | ||
|
|
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| public WebSocketServerProtocolHandler(String websocketPath, String subprotocols) { | ||
| this(websocketPath, subprotocols, false); | ||
| } | ||
|
|
||
| public WebSocketServerProtocolHandler(String websocketPath, String subprotocols, boolean allowExtensions) { | ||
| this.websocketPath = websocketPath; | ||
| this.subprotocols = subprotocols; | ||
| this.allowExtensions = allowExtensions; | ||
| } | ||
|
|
||
| @Override | ||
| public void afterAdd(ChannelHandlerContext ctx) { | ||
| ChannelPipeline cp = ctx.pipeline(); | ||
| if (cp.get(WebSocketServerProtocolHandshakeHandler.class) == null) { | ||
| // Add the WebSocketHandshakeHandler before this one. | ||
| ctx.pipeline().addBefore(ctx.name(), WebSocketServerProtocolHandshakeHandler.class.getName(), | ||
| new WebSocketServerProtocolHandshakeHandler(websocketPath, subprotocols, allowExtensions)); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void messageReceived(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception { | ||
| if (frame instanceof CloseWebSocketFrame) { | ||
| WebSocketServerHandshaker handshaker = WebSocketServerProtocolHandler.getHandshaker(ctx); | ||
| handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame); | ||
| return; | ||
| } else if (frame instanceof PingWebSocketFrame) { | ||
| ctx.channel().write(new PongWebSocketFrame(frame.getBinaryData())); | ||
| return; | ||
| } | ||
|
|
||
| ctx.nextInboundMessageBuffer().add(frame); | ||
| ctx.fireInboundBufferUpdated(); | ||
| } | ||
|
|
||
| @Override | ||
| public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { | ||
| if (cause instanceof WebSocketHandshakeException) { | ||
| DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.BAD_REQUEST); | ||
| response.setContent(Unpooled.wrappedBuffer(cause.getMessage().getBytes())); | ||
| ctx.channel().write(response).addListener(ChannelFutureListener.CLOSE); | ||
| } else { | ||
| ctx.close(); | ||
| } | ||
| } | ||
|
|
||
| static WebSocketServerHandshaker getHandshaker(ChannelHandlerContext ctx) { | ||
| return ctx.attr(HANDSHAKER_ATTR_KEY).get(); | ||
| } | ||
|
|
||
| static void setHandshaker(ChannelHandlerContext ctx, WebSocketServerHandshaker handshaker) { | ||
| ctx.attr(HANDSHAKER_ATTR_KEY).set(handshaker); | ||
| } | ||
|
|
||
| static ChannelHandler forbiddenHttpRequestResponder() { | ||
| return new ChannelInboundMessageHandlerAdapter<Object>() { | ||
| @Override | ||
| public void messageReceived(ChannelHandlerContext ctx, Object msg) throws Exception { | ||
| if (!(msg instanceof WebSocketFrame)) { | ||
| DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.FORBIDDEN); | ||
| ctx.channel().write(response); | ||
| } else { | ||
| ctx.nextInboundMessageBuffer().add(msg); | ||
| ctx.fireInboundBufferUpdated(); | ||
| } | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| } |
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