Java tutorial
/** * Copyright 2012 Nikita Koksharov * * Licensed 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.corundumstudio.socketio.transport; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandler.Sharable; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; import io.netty.util.CharsetUtil; import org.slf4j.Logger; import org.slf4j.LoggerFactory; @Sharable public class FlashSocketPolicyHandler extends ChannelInboundHandlerAdapter { private static final Logger log = LoggerFactory.getLogger(FlashSocketPolicyHandler.class); private final ByteBuf requestBuffer = Unpooled.copiedBuffer("<policy-file-request/>", CharsetUtil.UTF_8); private final ByteBuf responseBuffer = Unpooled.copiedBuffer("" + "<?xml version=\"1.0\" ?>\n" + "<!DOCTYPE cross-domain-policy SYSTEM \"http://www.adobe.com/xml/dtds/cross-domain-policy" + ".dtd\">\n" + "<cross-domain-policy>\n" + " <allow-access-from domain=\"*\" to-ports=\"*\" secure=\"false\"/>" + " <allow-access-from domain='d2xclp3ege6hxd.cloudfront.net' to-ports='*' />\n" + " <allow-access-from domain='da1e79qj82tlx.cloudfront.net' to-ports='*' />\n" + "</cross-domain-policy>", CharsetUtil.UTF_8); @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { if (msg instanceof ByteBuf) { ByteBuf message = (ByteBuf) msg; ByteBuf data = message.slice(0, requestBuffer.readableBytes()); if (data.equals(requestBuffer)) { message.release(); ChannelFuture f = ctx.writeAndFlush(Unpooled.copiedBuffer(responseBuffer)); f.addListener(ChannelFutureListener.CLOSE); return; } ctx.pipeline().remove(this); } ctx.fireChannelRead(msg); } }