Java tutorial
/* * 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 com.jjneko.jjnet.networking.http.server; import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE; import static io.netty.handler.codec.http.HttpHeaders.Names.HOST; import static io.netty.handler.codec.http.HttpMethod.GET; import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST; import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN; import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND; import static io.netty.handler.codec.http.HttpResponseStatus.OK; import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1; import gnu.trove.map.hash.THashMap; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.DefaultFullHttpResponse; import io.netty.handler.codec.http.FullHttpRequest; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.HttpHeaders; import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame; import io.netty.handler.codec.http.websocketx.PingWebSocketFrame; import io.netty.handler.codec.http.websocketx.PongWebSocketFrame; import io.netty.handler.codec.http.websocketx.TextWebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker; import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory; import io.netty.util.CharsetUtil; import java.util.logging.Logger; import com.jjneko.jjnet.networking.Protocol; import com.jjneko.jjnet.networking.pipes.http.SimpleHttpServerPipe; /** * Handles handshakes and messages */ public class WebSocketHttpServerHandler extends SimpleChannelInboundHandler<Object> { private static final String WEBSOCKET_PATH = "/websocket"; public static Logger logger = Logger.getLogger(WebSocketHttpServerHandler.class.getName()); private WebSocketServerHandshaker handshaker; private static boolean SSL = false; public static THashMap<String, SimpleHttpServerPipe> pipes = new THashMap<String, SimpleHttpServerPipe>(10); @Override public void channelRead0(ChannelHandlerContext ctx, Object msg) { if (msg instanceof FullHttpRequest) { handleHttpRequest(ctx, (FullHttpRequest) msg); } else if (msg instanceof WebSocketFrame) { handleWebSocket(ctx, (WebSocketFrame) msg); } } @Override public void channelReadComplete(ChannelHandlerContext ctx) { ctx.flush(); } private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req) { // Handle a bad request. if (!req.decoderResult().isSuccess()) { sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST)); return; } // Allow only GET methods. if (req.method() != GET) { sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN)); return; } // Send the demo page and favicon.ico if ("/".equals(req.uri())) { ByteBuf content = WebSocketHttpServerTestPage.getContent(getWebSocketLocation(req)); FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, OK, content); res.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8"); HttpHeaders.setContentLength(res, content.readableBytes()); sendHttpResponse(ctx, req, res); return; } if ("/favicon.ico".equals(req.uri())) { FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, NOT_FOUND); sendHttpResponse(ctx, req, res); return; } // Handshake WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(getWebSocketLocation(req), null, true); handshaker = wsFactory.newHandshaker(req); if (handshaker == null) { WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel()); } else { handshaker.handshake(ctx.channel(), req); } /* TODO disconnect clients that are not valid JJNET clients */ } private void handleWebSocket(ChannelHandlerContext ctx, WebSocketFrame frame) { try { // Check for closing frame if (frame instanceof CloseWebSocketFrame) { handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain()); return; } if (frame instanceof PingWebSocketFrame) { ctx.channel().write(new PongWebSocketFrame(frame.content().retain())); return; } if (!(frame instanceof TextWebSocketFrame)) { throw new UnsupportedOperationException( String.format("%s frame types not supported", frame.getClass().getName())); } String id = ctx.channel().id().asShortText(); String request = ((TextWebSocketFrame) frame).text(); if (pipes.containsKey(id)) { logger.finer(ctx.channel() + " received: " + request); pipes.get(id).queuePacket(request.getBytes("ISO-8859-1")); } else { if (request.startsWith(Protocol.PRP.toChar() + "")) { SimpleHttpServerPipe newpipe = new SimpleHttpServerPipe(null, ctx); newpipe.connect(); newpipe.queuePacket(request.getBytes("ISO-8859-1")); pipes.put(id, newpipe); } } } catch (Exception ex) { ex.printStackTrace(); } } private static void sendHttpResponse(ChannelHandlerContext ctx, FullHttpRequest req, FullHttpResponse res) { // Generate an error page if response getStatus code is not OK (200). if (res.status().code() != 200) { ByteBuf buf = Unpooled.copiedBuffer(res.status().toString(), CharsetUtil.UTF_8); res.content().writeBytes(buf); buf.release(); HttpHeaders.setContentLength(res, res.content().readableBytes()); } // Send the response and close the connection if necessary. ChannelFuture f = ctx.channel().writeAndFlush(res); if (!HttpHeaders.isKeepAlive(req) || res.status().code() != 200) { f.addListener(ChannelFutureListener.CLOSE); } } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { String id = ctx.channel().id().asShortText(); logger.info(cause.getMessage()); try { pipes.get(id).close(); } catch (Exception ex) { ctx.close(); } logger.info(id + " closed"); } private static String getWebSocketLocation(FullHttpRequest req) { String location = req.headers().get(HOST) + WEBSOCKET_PATH; if (isSSL()) { return "wss://" + location; } else { return "ws://" + location; } } /** * @return the SSL */ public static boolean isSSL() { return SSL; } /** * @param SSL the SSL to set */ public static void setSSL(boolean SSL) { WebSocketHttpServerHandler.SSL = SSL; } }