Motivation: Currently there's no way to configure maxFramePayloadSize from WebSocketServerProtocolHandler, which is the most used entry point of WebSocket server. Modifications: Added another constructor for maxFramePayloadSize. Result: We can configure max frame size for websocket packet in WebSocketServerProtocolHandler. It will also keep backward compatibility with default max size: 65536. (65536 is hard-coded max size in previous version of Netty)
152 lines
6.2 KiB
Java
152 lines
6.2 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.buffer.Unpooled;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelInboundHandler;
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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.FullHttpResponse;
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import io.netty.handler.codec.http.HttpResponseStatus;
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import io.netty.util.AttributeKey;
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import java.util.List;
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import static io.netty.handler.codec.http.HttpVersion.*;
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/**
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* This handler does all the heavy lifting for you to run a websocket server.
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*
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* It takes care of websocket handshaking as well as processing of control frames (Close, Ping, Pong). Text and Binary
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* data frames are passed to the next handler in the pipeline (implemented by you) for processing.
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*
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* See <tt>io.netty.example.http.websocketx.html5.WebSocketServer</tt> for usage.
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*
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* The implementation of this handler assumes that you just want to run a websocket server and not process other types
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* HTTP requests (like GET and POST). If you wish to support both HTTP requests and websockets in the one server, refer
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* to the <tt>io.netty.example.http.websocketx.server.WebSocketServer</tt> example.
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*
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* To know once a handshake was done you can intercept the
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* {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)} and check if the event was of type
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* {@link ServerHandshakeStateEvent#HANDSHAKE_COMPLETE}.
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*/
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public class WebSocketServerProtocolHandler extends WebSocketProtocolHandler {
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/**
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* Events that are fired to notify about handshake status
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*/
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public enum ServerHandshakeStateEvent {
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/**
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* The Handshake was complete succesful and so the channel was upgraded to websockets
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*/
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HANDSHAKE_COMPLETE
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}
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private static final AttributeKey<WebSocketServerHandshaker> HANDSHAKER_ATTR_KEY =
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AttributeKey.valueOf(WebSocketServerHandshaker.class, "HANDSHAKER");
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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 maxFramePayloadLength;
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public WebSocketServerProtocolHandler(String websocketPath) {
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this(websocketPath, null, false);
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}
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public WebSocketServerProtocolHandler(String websocketPath, String subprotocols) {
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this(websocketPath, subprotocols, false);
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}
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public WebSocketServerProtocolHandler(String websocketPath, String subprotocols, boolean allowExtensions) {
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this(websocketPath, subprotocols, allowExtensions, 65536);
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}
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public WebSocketServerProtocolHandler(String websocketPath, String subprotocols,
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boolean allowExtensions, int maxFrameSize) {
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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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this.maxFramePayloadLength = maxFrameSize;
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}
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@Override
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public void handlerAdded(ChannelHandlerContext ctx) {
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ChannelPipeline cp = ctx.pipeline();
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if (cp.get(WebSocketServerProtocolHandshakeHandler.class) == null) {
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// Add the WebSocketHandshakeHandler before this one.
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ctx.pipeline().addBefore(ctx.name(), WebSocketServerProtocolHandshakeHandler.class.getName(),
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new WebSocketServerProtocolHandshakeHandler(websocketPath, subprotocols,
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allowExtensions, maxFramePayloadLength));
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}
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, WebSocketFrame frame, List<Object> out) throws Exception {
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if (frame instanceof CloseWebSocketFrame) {
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WebSocketServerHandshaker handshaker = getHandshaker(ctx);
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if (handshaker != null) {
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frame.retain();
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handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame);
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} else {
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ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
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}
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return;
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}
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super.decode(ctx, frame, out);
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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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if (cause instanceof WebSocketHandshakeException) {
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FullHttpResponse response = new DefaultFullHttpResponse(
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HTTP_1_1, HttpResponseStatus.BAD_REQUEST, Unpooled.wrappedBuffer(cause.getMessage().getBytes()));
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ctx.channel().writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
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} else {
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ctx.close();
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}
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}
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static WebSocketServerHandshaker getHandshaker(ChannelHandlerContext ctx) {
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return ctx.attr(HANDSHAKER_ATTR_KEY).get();
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}
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static void setHandshaker(ChannelHandlerContext ctx, WebSocketServerHandshaker handshaker) {
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ctx.attr(HANDSHAKER_ATTR_KEY).set(handshaker);
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}
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static ChannelHandler forbiddenHttpRequestResponder() {
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return new ChannelInboundHandlerAdapter() {
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@Override
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public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
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if (msg instanceof FullHttpRequest) {
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((FullHttpRequest) msg).release();
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FullHttpResponse response =
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new DefaultFullHttpResponse(HTTP_1_1, HttpResponseStatus.FORBIDDEN);
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ctx.channel().writeAndFlush(response);
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} else {
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ctx.fireChannelRead(msg);
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}
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}
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};
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}
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}
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