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

  1/*
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 22	THIS SOURCE CODE IS PROVIDED "AS IS" AND "WITH ALL FAULTS", WITHOUT 
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 35package com.adobe.net.proxies
 36{
 37	import flash.events.Event;
 38	import flash.events.IOErrorEvent;
 39	import flash.events.ProgressEvent;
 40	import flash.net.Socket;
 41
 42	/**
 43	 * This class allows TCP socket connections through HTTP proxies in accordance with
 44	 * RFC 2817:
 45	 * 
 46	 * ftp://ftp.rfc-editor.org/in-notes/rfc2817.txt
 47	 * 
 48	 * It can also be used to make direct connections to a destination, as well. If you
 49	 * pass the host and port into the constructor, no proxy will be used. You can also
 50	 * call connect, passing in the host and the port, and if you didn't set the proxy
 51	 * info, a direct connection will be made. A proxy is only used after you have called
 52	 * the setProxyInfo function.
 53	 * 
 54	 * The connection to and negotiation with the proxy is completely hidden. All the
 55	 * same events are thrown whether you are using a proxy or not, and the data you
 56	 * receive from the target server will look exact as it would if you were connected
 57	 * to it directly rather than through a proxy.
 58	 * 
 59	 * @author Christian Cantrell
 60	 * 
 61	 **/
 62	public class RFC2817Socket
 63		extends Socket
 64	{
 65		private var proxyHost:String = null;
 66		private var host:String = null;
 67		private var proxyPort:int = 0;
 68		private var port:int = 0;
 69		private var deferredEventHandlers:Object = new Object();
 70		private var buffer:String = new String();
 71
 72		/**
 73		 * Construct a new RFC2817Socket object. If you pass in the host and the port,
 74		 * no proxy will be used. If you want to use a proxy, instantiate with no
 75		 * arguments, call setProxyInfo, then call connect.
 76		 **/
 77		public function RFC2817Socket(host:String = null, port:int = 0)
 78		{
 79			if (host != null && port != 0)
 80			{
 81				super(host, port);
 82			}
 83		}
 84		
 85		/**
 86		 * Set the proxy host and port number. Your connection will only proxied if
 87		 * this function has been called.
 88		 **/
 89		public function setProxyInfo(host:String, port:int):void
 90		{
 91			this.proxyHost = host;
 92			this.proxyPort = port;
 93
 94			var deferredSocketDataHandler:Object = this.deferredEventHandlers[ProgressEvent.SOCKET_DATA];
 95			var deferredConnectHandler:Object = this.deferredEventHandlers[Event.CONNECT];
 96
 97			if (deferredSocketDataHandler != null)
 98			{
 99				super.removeEventListener(ProgressEvent.SOCKET_DATA, deferredSocketDataHandler.listener, deferredSocketDataHandler.useCapture);
100			}
101
102			if (deferredConnectHandler != null)
103			{
104				super.removeEventListener(Event.CONNECT, deferredConnectHandler.listener, deferredConnectHandler.useCapture);
105			}
106		}
107		
108		/**
109		 * Connect to the specified host over the specified port. If you want your
110		 * connection proxied, call the setProxyInfo function first.
111		 **/
112		public override function connect(host:String, port:int):void
113		{
114			if (this.proxyHost == null)
115			{
116				this.redirectConnectEvent();
117				this.redirectSocketDataEvent();
118				super.connect(host, port);
119			}
120			else
121			{
122				this.host = host;
123				this.port = port;
124				super.addEventListener(Event.CONNECT, this.onConnect);
125				super.addEventListener(ProgressEvent.SOCKET_DATA, this.onSocketData);
126				super.connect(this.proxyHost, this.proxyPort);
127			}
128		}
129
130		private function onConnect(event:Event):void
131		{
132			this.writeUTFBytes("CONNECT "+this.host+":"+this.port+" HTTP/1.1\n\n");
133			this.flush();
134			this.redirectConnectEvent();
135		}
136		
137		private function onSocketData(event:ProgressEvent):void
138		{
139			while (this.bytesAvailable != 0)
140			{
141				this.buffer += this.readUTFBytes(1);
142				if (this.buffer.search(/\r?\n\r?\n$/) != -1)
143				{
144					this.checkResponse(event);
145					break;
146				}
147			}
148		}
149		
150		private function checkResponse(event:ProgressEvent):void
151		{
152			var responseCode:String = this.buffer.substr(this.buffer.indexOf(" ")+1, 3);
153
154			if (responseCode.search(/^2/) == -1)
155			{
156				var ioError:IOErrorEvent = new IOErrorEvent(IOErrorEvent.IO_ERROR);
157				ioError.text = "Error connecting to the proxy ["+this.proxyHost+"] on port ["+this.proxyPort+"]: " + this.buffer;
158				this.dispatchEvent(ioError);
159			}
160			else
161			{
162				this.redirectSocketDataEvent();
163				this.dispatchEvent(new Event(Event.CONNECT));
164				if (this.bytesAvailable > 0)
165				{
166					this.dispatchEvent(event);
167				}
168			}
169			this.buffer = null;
170		}
171		
172		private function redirectConnectEvent():void
173		{
174			super.removeEventListener(Event.CONNECT, onConnect);
175			var deferredEventHandler:Object = this.deferredEventHandlers[Event.CONNECT];
176			if (deferredEventHandler != null)
177			{
178				super.addEventListener(Event.CONNECT, deferredEventHandler.listener, deferredEventHandler.useCapture, deferredEventHandler.priority, deferredEventHandler.useWeakReference);			
179			}
180		}
181		
182		private function redirectSocketDataEvent():void
183		{
184			super.removeEventListener(ProgressEvent.SOCKET_DATA, onSocketData);
185			var deferredEventHandler:Object = this.deferredEventHandlers[ProgressEvent.SOCKET_DATA];
186			if (deferredEventHandler != null)
187			{
188				super.addEventListener(ProgressEvent.SOCKET_DATA, deferredEventHandler.listener, deferredEventHandler.useCapture, deferredEventHandler.priority, deferredEventHandler.useWeakReference);			
189			}
190		}
191		
192		public override function addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int=0.0, useWeakReference:Boolean=false):void
193		{
194			if (type == Event.CONNECT || type == ProgressEvent.SOCKET_DATA)
195			{
196				this.deferredEventHandlers[type] = {listener:listener,useCapture:useCapture, priority:priority, useWeakReference:useWeakReference};
197			}
198			else
199			{
200				super.addEventListener(type, listener, useCapture, priority, useWeakReference);
201			}
202		}
203	}
204}