whitespell.net.websockets.socketio.transport.FlashPolicyHandler.java Source code

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Here is the source code for whitespell.net.websockets.socketio.transport.FlashPolicyHandler.java

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/**
 * 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 whitespell.net.websockets.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;

@Sharable
public class FlashPolicyHandler extends ChannelInboundHandlerAdapter {

    private final ByteBuf requestBuffer = Unpooled
            .unreleasableBuffer(Unpooled.copiedBuffer("<policy-file-request/>", CharsetUtil.UTF_8));

    private final ByteBuf responseBuffer = Unpooled.unreleasableBuffer(Unpooled.copiedBuffer(
            "<?xml version=\"1.0\"?>"
                    + "<!DOCTYPE cross-domain-policy SYSTEM \"/xml/dtds/cross-domain-policy.dtd\">"
                    + "<cross-domain-policy> "
                    + "   <site-control permitted-cross-domain-policies=\"master-only\"/>"
                    + "   <allow-access-from domain=\"*\" to-ports=\"*\" />" + "</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(responseBuffer);
                f.addListener(ChannelFutureListener.CLOSE);
                return;
            }
            ctx.pipeline().remove(this);
        }
        ctx.fireChannelRead(msg);
    }

}