/*
Adobe Systems Incorporated(r) Source Code License Agreement
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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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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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);
}
}
}
}