source: code/Website/open-flash-chart/com/adobe/net/proxies/RFC2817Socket.as

Last change on this file was 7849, checked in by dennisw, 15 years ago
File size: 7.4 KB
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[7849]1/*
2 Adobe Systems Incorporated(r) Source Code License Agreement
3 Copyright(c) 2005 Adobe Systems Incorporated. All rights reserved.
4
5 Please read this Source Code License Agreement carefully before using
6 the source code.
7
8 Adobe Systems Incorporated grants to you a perpetual, worldwide, non-exclusive,
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11 distribute this source code and such derivative works in source or
12 object code form without any attribution requirements.
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15 derived from the source code without prior written permission.
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17 You agree to indemnify, hold harmless and defend Adobe Systems Incorporated from and
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20 code.
21
22 THIS SOURCE CODE IS PROVIDED "AS IS" AND "WITH ALL FAULTS", WITHOUT
23 ANY TECHNICAL SUPPORT OR ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
24 BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ALSO, THERE IS NO WARRANTY OF
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34*/
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}
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