Mercurial > eldonilo > lightstring

annotate lightstring.js @ 29:1e6d2ca2daae

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Adds a Lightstring.Stanza object and use it.
author Sonny Piers <sonny.piers@gmail.com>
date Sat, 28 Jan 2012 04:34:30 +0100
parents 630b9579fe4a
children 6ce66fba0242
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1 'use strict';
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2
2
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3 /**
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4 Copyright (c) 2011, Sonny Piers <sonny at fastmail dot net>
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5
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6 Permission to use, copy, modify, and/or distribute this software for any
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7 purpose with or without fee is hereby granted, provided that the above
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8 copyright notice and this permission notice appear in all copies.
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9
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10 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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20 /**
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21 * @namespace No code from lightstring should be callable outside this namespace/scope.
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22 */
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23 var Lightstring = {
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24 /**
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25 * @namespace Holds XMPP namespaces.
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26 */
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27 NS: {
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28 stream: 'http://etherx.jabber.org/streams',
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29 jabberClient: 'jabber:client'
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30 },
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31 /**
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32 * @namespace Holds XMPP stanza builders.
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33 */
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34 stanza: {
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35 stream: {
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36 open: function(aService) {
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37 //FIXME no ending "/" - node-xmpp-bosh bug
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38 return "<stream:stream to='" + aService + "'" +
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39 " xmlns='" + Lightstring.NS.jabberClient + "'" +
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40 " xmlns:stream='" + Lightstring.NS.stream + "'" +
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41 " version='1.0'/>";
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42 },
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43 close: function() {
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44 return "</stream:stream>";
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45 }
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46 }
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47 },
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48 /**
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49 * @private
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50 */
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51 parser: new DOMParser(),
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52 /**
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53 * @private
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54 */
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55 serializer: new XMLSerializer(),
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56 /**
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57 * @function Transforms a XML string to a DOM object.
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58 * @param {String} aString XML string.
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59 * @return {Object} Domified XML.
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60 */
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61 XML2DOM: function(aString) {
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62 var DOM = null;
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63 try {
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64 DOM = this.parser.parseFromString(aString, 'text/xml').documentElement;
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65 }
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66 catch (e) {
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67 alert(e);
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68 }
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69 finally {
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70 return DOM;
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71 };
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72 },
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73 /**
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74 * @function Transforms a DOM object to a XML string.
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75 * @param {Object} aString DOM object.
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76 * @return {String} Stringified DOM.
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77 */
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78 DOM2XML: function(aElement) {
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79 var XML = null;
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80 try {
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81 XML = this.serializer.serializeToString(aElement);
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82 }
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83 catch (e) {
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84 alert(e);
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85 }
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86 finally {
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87 return XML;
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88 };
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89 }
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90 };
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91
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92 /**
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93 * @constructor Creates a new Lightstring connection
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94 * @param {String} [aService] The Websocket service URL.
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95 * @memberOf Lightstring
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96 */
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97 Lightstring.Connection = function(aService) {
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98 if (aService)
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99 this.service = aService;
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100 this.handlers = {};
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101 this.iqid = 1024;
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102 this.getNewId = function() {
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103 this.iqid++;
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104 return 'sendiq:' + this.iqid;
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105 };
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106 this.on('stream:features', function(stanza, that) {
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107 var nodes = stanza.DOM.querySelectorAll('mechanism');
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108 //SASL/Auth features
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109 if (nodes.length > 0) {
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110 that.emit('mechanisms', stanza);
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111 var mechanisms = {};
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112 for (var i = 0; i < nodes.length; i++)
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113 mechanisms[nodes[i].textContent] = true;
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114
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115
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116 //FIXME support SCRAM-SHA1 && allow specify method preferences
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117 if ('DIGEST-MD5' in mechanisms)
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118 that.send(
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119 "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl'" +
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120 " mechanism='DIGEST-MD5'/>"
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121 );
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122 else if ('PLAIN' in mechanisms) {
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123 var token = btoa(
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124 that.jid +
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125 '\u0000' +
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126 that.jid.node +
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127 '\u0000' +
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128 that.password
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129 );
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130 that.send(
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131 "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl'" +
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132 " mechanism='PLAIN'>" + token + "</auth>"
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133 );
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134 }
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135 }
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136 //XMPP features
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137 else {
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138 that.emit('features', stanza);
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139 //Bind http://xmpp.org/rfcs/rfc3920.html#bind
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140 var bind =
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141 "<iq type='set' xmlns='jabber:client'>" +
24
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142 "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>" +
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143 (that.jid.resource? "<resource>" + that.jid.resource + "</resource>": "") +
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144 "</bind>" +
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145 "</iq>";
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146
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147 that.send(
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148 bind,
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149 function(stanza) {
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150 //Session http://xmpp.org/rfcs/rfc3921.html#session
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151 that.jid = new Lightstring.JID(stanza.DOM.textContent);
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152 that.send(
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153 "<iq type='set' xmlns='jabber:client'>" +
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154 "<session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>" +
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155 "</iq>",
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156 function() {
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157 that.emit('connected');
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158 }
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159 );
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160 }
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161 );
1
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162 }
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163 });
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164 this.on('success', function(stanza, that) {
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165 that.send(
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166 "<stream:stream to='" + that.jid.domain + "'" +
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167 " xmlns='jabber:client'" +
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168 " xmlns:stream='http://etherx.jabber.org/streams'" +
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169 " version='1.0'/>"
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170 );
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171 });
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172 this.on('failure', function(stanza, that) {
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173 that.emit('conn-error', stanza.DOM.firstChild.tagName);
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174 });
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175 this.on('challenge', function(stanza, that) {
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176 //FIXME this is mostly Strophe code
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177
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178 function _quote(str) {
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179 return '"' + str.replace(/\\/g, '\\\\').replace(/"/g, '\\"') + '"';
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180 };
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181
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182 var challenge = atob(stanza.DOM.textContent);
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183
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184 var attribMatch = /([a-z]+)=("[^"]+"|[^,"]+)(?:,|$)/;
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185
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186 var cnonce = MD5.hexdigest(Math.random() * 1234567890);
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187 var realm = '';
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188 var host = null;
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189 var nonce = '';
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190 var qop = '';
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191 var matches;
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192
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193 while (challenge.match(attribMatch)) {
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194 matches = challenge.match(attribMatch);
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195 challenge = challenge.replace(matches[0], '');
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196 matches[2] = matches[2].replace(/^"(.+)"$/, '$1');
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197 switch (matches[1]) {
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198 case 'realm':
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199 realm = matches[2];
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200 break;
13
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201 case 'nonce':
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202 nonce = matches[2];
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203 break;
13
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204 case 'qop':
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205 qop = matches[2];
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206 break;
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207 case 'host':
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208 host = matches[2];
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209 break;
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210 }
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211 }
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212
22
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213 var digest_uri = 'xmpp/' + that.jid.domain;
21
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214 if (host !== null)
13
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215 digest_uri = digest_uri + '/' + host;
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216 var A1 = MD5.hash(that.jid.node +
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217 ':' + realm + ':' + that.password) +
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218 ':' + nonce + ':' + cnonce;
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219 var A2 = 'AUTHENTICATE:' + digest_uri;
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220
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221 var responseText = '';
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222 responseText += 'username=' + _quote(that.jid.node) + ',';
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223 responseText += 'realm=' + _quote(realm) + ',';
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224 responseText += 'nonce=' + _quote(nonce) + ',';
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225 responseText += 'cnonce=' + _quote(cnonce) + ',';
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226 responseText += 'nc="00000001",';
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227 responseText += 'qop="auth",';
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228 responseText += 'digest-uri=' + _quote(digest_uri) + ',';
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229 responseText += 'response=' + _quote(
13
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230 MD5.hexdigest(MD5.hexdigest(A1) + ':' +
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231 nonce + ':00000001:' +
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232 cnonce + ':auth:' +
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233 MD5.hexdigest(A2))) + ',';
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234 responseText += 'charset="utf-8"';
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235 that.send(
21
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236 "<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>" +
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237 btoa(responseText) +
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238 "</response>");
1
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239 });
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240 };
17
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241 Lightstring.Connection.prototype = {
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242 /**
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243 * @function Create and open a websocket then go though the XMPP authentification process.
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244 * @param {String} [aJid] The JID (Jabber id) to use.
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245 * @param {String} [aPassword] The associated password.
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246 */
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247 connect: function(aJid, aPassword) {
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248 this.emit('connecting');
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249 this.jid = new Lightstring.JID(aJid);
17
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250 if (aPassword)
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251 this.password = aPassword;
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252
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253 if (!this.jid.bare)
17
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254 throw 'Lightstring: Connection.jid is undefined.';
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255 if (!this.password)
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256 throw 'Lightstring: Connection.password is undefined.';
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257 if (!this.service)
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258 throw 'Lightstring: Connection.service is undefined.';
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259
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260 //"Bug 695635 - tracking bug: unprefix WebSockets" https://bugzil.la/695635
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diff changeset
261 try {
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262 this.socket = new WebSocket(this.service, 'xmpp');
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263 }
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264 catch (error) {
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265 this.socket = new MozWebSocket(this.service, 'xmpp');
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266 }
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267
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268 var that = this;
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269 this.socket.addEventListener('open', function() {
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270 //TODO: if (this.protocol !== 'xmpp')
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271
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272 var stream = Lightstring.stanza.stream.open(that.jid.domain);
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273 //TODO: Use Lightstring.Connection.send (problem with parsing steam);
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274 that.socket.send(stream);
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275 var stanza = {
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276 XML: stream
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277 };
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278 that.emit('output', stanza);
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279 });
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280 this.socket.addEventListener('error', function(e) {
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281 that.emit('error', e.data);
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282 console.log(e.data);
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283 });
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284 this.socket.addEventListener('close', function(e) {
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285 that.emit('disconnected', e.data);
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286 });
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287 this.socket.addEventListener('message', function(e) {
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288 var stanza = new Lightstring.Stanza(e.data);
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289
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290 //TODO node-xmpp-bosh sends a self-closing stream:stream tag; it is wrong!
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291 that.emit('input', stanza);
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292
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293 if(!stanza.DOM)
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294 return;
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295
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296 that.emit(stanza.DOM.tagName, stanza);
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297
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298 if (stanza.DOM.tagName === 'iq') {
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299 var payload = stanza.DOM.firstChild;
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300 if (payload)
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301 that.emit('iq/' + payload.namespaceURI + ':' + payload.localName, stanza);
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302 that.emit(stanza.DOM.getAttribute('id'), stanza); //FIXME: possible attack vector.
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303 }
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304 });
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305 },
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306 /**
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307 * @function Send a message.
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308 * @param {String|Object} aStanza The message to send.
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309 * @param {Function} [aCallback] Executed on answer. (stanza must be iq)
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310 */
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311 send: function(aStanza, aCallback) {
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312 if (!(aStanza instanceof Lightstring.Stanza))
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313 var stanza = new Lightstring.Stanza(aStanza);
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314 else
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315 var stanza = aStanza;
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316
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317 if(!stanza)
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318 return;
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319
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320 if (stanza.DOM.tagName === 'iq') {
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321 var id = stanza.DOM.getAttribute('id');
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322 //TODO: This should be done by a plugin
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323 if (!id) {
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324 alert(Lightstring.DOM2XML(stanza.DOM));
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325 stanza.DOM.setAttribute('id', this.getNewId());
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326 }
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327 if (aCallback)
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328 this.on(stanza.DOM.getAttribute('id'), aCallback);
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329 }
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330 else if (aCallback) {
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331 this.emit('warning', 'Callback can\'t be called with non-iq stanza.');
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332 }
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333
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334
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335 //TODO this.socket.send(stanza.XML); (need some work on Lightstring.Stanza)
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336 this.socket.send(Lightstring.DOM2XML(stanza.DOM));
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337 this.emit('output', stanza);
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338 },
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339 /**
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340 * @function Closes the XMPP stream and the socket.
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341 */
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342 disconnect: function() {
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343 this.emit('disconnecting');
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344 var stream = Lightstring.stanza.stream.close();
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345 this.send(stream);
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346 this.emit('XMLOutput', stream);
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347 this.socket.close();
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348 },
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349 /**
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350 * @function Emits an event.
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351 * @param {String} aName The event name.
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352 * @param {Function|Array|Object} [aData] Data about the event.
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353 */
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354 emit: function(aName, aData) {
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355 var handlers = this.handlers[aName];
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356 if (!handlers)
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357 return;
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358
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359 //FIXME Better idea than passing the context as argument?
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360 for (var i = 0; i < handlers.length; i++)
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361 handlers[i](aData, this);
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362
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363 if (aName.match('sendiq:'))
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364 delete this.handlers[aName];
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365 },
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366 /**
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367 * @function Register an event handler.
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368 * @param {String} aName The event name.
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369 * @param {Function} aCallback The callback to call when the event is emitted.
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370 */
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371 on: function(aName, callback) {
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372 if (!this.handlers[aName])
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373 this.handlers[aName] = [];
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374 this.handlers[aName].push(callback);
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375 }
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376 //FIXME do this!
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377 //~ this.once = function(name, callback) {
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378 //~ if(!this.handlers[name])
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379 //~ this.handlers[name] = [];
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380 //~ this.handlers[name].push(callback);
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381 //~ };
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382 };