/js/lib/Socket.IO-node/support/socket.io-client/lib/vendor/web-socket-js/flash-src/com/adobe/net/proxies/RFC2817Socket.as

/*
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	Copyright(c) 2005 Adobe Systems Incorporated. All rights reserved.
	
	Please read this Source Code License Agreement carefully before using
	the source code.
	
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	code.
	
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package com.adobe.net.proxies
{
	import flash.events.Event;
	import flash.events.IOErrorEvent;
	import flash.events.ProgressEvent;
	import flash.net.Socket;

	/**
	 * This class allows TCP socket connections through HTTP proxies in accordance with
	 * RFC 2817:
	 * 
	 * ftp://ftp.rfc-editor.org/in-notes/rfc2817.txt
	 * 
	 * It can also be used to make direct connections to a destination, as well. If you
	 * pass the host and port into the constructor, no proxy will be used. You can also
	 * call connect, passing in the host and the port, and if you didn't set the proxy
	 * info, a direct connection will be made. A proxy is only used after you have called
	 * the setProxyInfo function.
	 * 
	 * The connection to and negotiation with the proxy is completely hidden. All the
	 * same events are thrown whether you are using a proxy or not, and the data you
	 * receive from the target server will look exact as it would if you were connected
	 * to it directly rather than through a proxy.
	 * 
	 * @author Christian Cantrell
	 * 
	 **/
	public class RFC2817Socket
		extends Socket
	{
		private var proxyHost:String = null;
		private var host:String = null;
		private var proxyPort:int = 0;
		private var port:int = 0;
		private var deferredEventHandlers:Object = new Object();
		private var buffer:String = new String();

		/**
		 * Construct a new RFC2817Socket object. If you pass in the host and the port,
		 * no proxy will be used. If you want to use a proxy, instantiate with no
		 * arguments, call setProxyInfo, then call connect.
		 **/
		public function RFC2817Socket(host:String = null, port:int = 0)
		{
			if (host != null && port != 0)
			{
				super(host, port);
			}
		}
		
		/**
		 * Set the proxy host and port number. Your connection will only proxied if
		 * this function has been called.
		 **/
		public function setProxyInfo(host:String, port:int):void
		{
			this.proxyHost = host;
			this.proxyPort = port;

			var deferredSocketDataHandler:Object = this.deferredEventHandlers[ProgressEvent.SOCKET_DATA];
			var deferredConnectHandler:Object = this.deferredEventHandlers[Event.CONNECT];

			if (deferredSocketDataHandler != null)
			{
				super.removeEventListener(ProgressEvent.SOCKET_DATA, deferredSocketDataHandler.listener, deferredSocketDataHandler.useCapture);
			}

			if (deferredConnectHandler != null)
			{
				super.removeEventListener(Event.CONNECT, deferredConnectHandler.listener, deferredConnectHandler.useCapture);
			}
		}
		
		/**
		 * Connect to the specified host over the specified port. If you want your
		 * connection proxied, call the setProxyInfo function first.
		 **/
		public override function connect(host:String, port:int):void
		{
			if (this.proxyHost == null)
			{
				this.redirectConnectEvent();
				this.redirectSocketDataEvent();
				super.connect(host, port);
			}
			else
			{
				this.host = host;
				this.port = port;
				super.addEventListener(Event.CONNECT, this.onConnect);
				super.addEventListener(ProgressEvent.SOCKET_DATA, this.onSocketData);
				super.connect(this.proxyHost, this.proxyPort);
			}
		}

		private function onConnect(event:Event):void
		{
			this.writeUTFBytes("CONNECT "+this.host+":"+this.port+" HTTP/1.1\n\n");
			this.flush();
			this.redirectConnectEvent();
		}
		
		private function onSocketData(event:ProgressEvent):void
		{
			while (this.bytesAvailable != 0)
			{
				this.buffer += this.readUTFBytes(1);
				if (this.buffer.search(/\r?\n\r?\n$/) != -1)
				{
					this.checkResponse(event);
					break;
				}
			}
		}
		
		private function checkResponse(event:ProgressEvent):void
		{
			var responseCode:String = this.buffer.substr(this.buffer.indexOf(" ")+1, 3);

			if (responseCode.search(/^2/) == -1)
			{
				var ioError:IOErrorEvent = new IOErrorEvent(IOErrorEvent.IO_ERROR);
				ioError.text = "Error connecting to the proxy ["+this.proxyHost+"] on port ["+this.proxyPort+"]: " + this.buffer;
				this.dispatchEvent(ioError);
			}
			else
			{
				this.redirectSocketDataEvent();
				this.dispatchEvent(new Event(Event.CONNECT));
				if (this.bytesAvailable > 0)
				{
					this.dispatchEvent(event);
				}
			}
			this.buffer = null;
		}
		
		private function redirectConnectEvent():void
		{
			super.removeEventListener(Event.CONNECT, onConnect);
			var deferredEventHandler:Object = this.deferredEventHandlers[Event.CONNECT];
			if (deferredEventHandler != null)
			{
				super.addEventListener(Event.CONNECT, deferredEventHandler.listener, deferredEventHandler.useCapture, deferredEventHandler.priority, deferredEventHandler.useWeakReference);			
			}
		}
		
		private function redirectSocketDataEvent():void
		{
			super.removeEventListener(ProgressEvent.SOCKET_DATA, onSocketData);
			var deferredEventHandler:Object = this.deferredEventHandlers[ProgressEvent.SOCKET_DATA];
			if (deferredEventHandler != null)
			{
				super.addEventListener(ProgressEvent.SOCKET_DATA, deferredEventHandler.listener, deferredEventHandler.useCapture, deferredEventHandler.priority, deferredEventHandler.useWeakReference);			
			}
		}
		
		public override function addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int=0.0, useWeakReference:Boolean=false):void
		{
			if (type == Event.CONNECT || type == ProgressEvent.SOCKET_DATA)
			{
				this.deferredEventHandlers[type] = {listener:listener,useCapture:useCapture, priority:priority, useWeakReference:useWeakReference};
			}
			else
			{
				super.addEventListener(type, listener, useCapture, priority, useWeakReference);
			}
		}
	}
}