Mercurial > eldonilo > lightstring

annotate lightstring.js @ 13:9aeb0750b9d1

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fix an error with the stream builder
author Sonny Piers <sonny.piers@gmail.com>
date Sun, 15 Jan 2012 15:23:51 +0100
parents 9fbd0e3678b5
children 6707f450549e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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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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19
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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 return this.parser.parseFromString(aString, 'text/xml').documentElement;
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63 },
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64 /**
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65 * @function Transforms a DOM object to a XML string.
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66 * @param {Object} aString DOM object.
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67 * @return {String} Stringified DOM.
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68 */
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69 dom2xml: function(aElement) {
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70 return this.serializer.serializeToString(aElement);
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71 }
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72 };
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73
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74 /**
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75 * @constructor Creates a new Lightstring connection
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76 * @param {String} [aService] The Websocket service URL.
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77 * @memberOf Lightstring
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78 */
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79 Lightstring.Connection = function(aService) {
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80 if (aService)
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81 this.service = aService;
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82 this.handlers = {};
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83 this.iqid = 1024;
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84 this.getNewId = function() {
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85 this.iqid++;
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86 return 'sendiq:' + this.iqid;
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87 };
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88 /**
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89 * @function Create and open a websocket then go though the XMPP authentification process.
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90 * @param {String} [aJid] The JID (Jabber id) to use.
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91 * @param {String} [aPassword] The associated password.
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92 */
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93 this.connect = function(aJid, aPassword) {
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94 this.emit('connecting');
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95 if (aJid)
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96 this.jid = aJid;
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97 if (this.jid) {
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98 this.host = this.jid.split('@')[1];
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99 this.node = this.jid.split('@')[0];
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100 this.resource = this.jid.split('/')[1];
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101 }
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102 if (aPassword)
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103 this.password = aPassword;
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104
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105 if (!this.jid)
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106 throw 'Lightstring: Connection.jid is undefined.';
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107 if (!this.password)
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108 throw 'Lightstring: Connection.password is undefined.';
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109 if (!this.service)
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110 throw 'Lightstring: Connection.service is undefined.';
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111
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112 //"Bug 695635 - tracking bug: unprefix WebSockets" https://bugzil.la/695635
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113 try {
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114 this.socket = new WebSocket(this.service, 'xmpp');
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115 }
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116 catch (error) {
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117 this.socket = new MozWebSocket(this.service, 'xmpp');
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118 }
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119
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120 var that = this;
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121 this.socket.addEventListener('open', function() {
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122 if (this.protocol !== 'xmpp')
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123 throw 'Lightstring: The server located at '+ that.service + ' is not XMPP aware.';
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124
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125 var stream = Lightstring.stanza.stream.open(that.host);
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126
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127 that.socket.send(stream);
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128 that.emit('XMLOutput', stream);
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129 });
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130 this.socket.addEventListener('error', function(e) {
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131 that.emit('error', e.data);
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132 console.log(e.data);
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133 });
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134 this.socket.addEventListener('close', function(e) {
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135 that.emit('disconnected', e.data);
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136 });
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137 this.socket.addEventListener('message', function(e) {
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138 that.emit('XMLInput', e.data);
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139 var elm = Lightstring.xml2dom(e.data);
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140 that.emit('DOMInput', elm);
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141 that.emit(elm.tagName, elm);
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142
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143 if (elm.tagName === 'iq')
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144 that.emit(elm.getAttribute('id'), elm);
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145 });
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146 };
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147 /**
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148 * @function Send a message.
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149 * @param {String|Object} aStanza The message to send.
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150 * @param {Function} [aCallback] Executed on answer. (stanza must be iq)
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151 */
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152 this.send = function(aStanza, aCallback) {
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153 if (typeof aStanza === 'string') {
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154 var str = aStanza;
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155 var elm = Lightstring.xml2dom(str);
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156 }
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157 else if (aStanza instanceof Element) {
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158 var elm = aStanza;
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159 var str = this.dom2xml(elm);
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160 }
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161 else {
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162 that.emit('error', 'Unsupported data type.');
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163 }
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164
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165
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166 if (elm.tagName === 'iq') {
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167 var id = elm.getAttribute('id');
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168 if (!id) {
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169 elm.setAttribute('id', this.getNewId());
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170 str = Lightstring.dom2xml(elm);
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171 }
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172 if (aCallback)
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173 this.on(elm.getAttribute('id'), aCallback);
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174 }
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175 else if (aCallback) {
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176 that.emit('warning', 'Callback can\'t be called with non-iq stanza.');
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177 }
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178
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179
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180 this.socket.send(str);
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181 this.emit('XMLOutput', str);
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182 this.emit('DOMOutput', elm);
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183 };
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184 /**
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185 * @function Closes the XMPP stream and the socket.
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186 */
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187 this.disconnect = function() {
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188 this.emit('disconnecting');
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189 var stream = Lighstring.stanza.stream.close();
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190 this.send(stream);
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191 that.emit('XMLOutput', stream);
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192 this.socket.close();
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193 };
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194 /**
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195 * @function Emits an event.
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196 * @param {String} aName The event name.
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197 * @param {Function|Array|Object} [aData] Data about the event.
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198 */
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199 this.emit = function(aName, aData) {
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200 var handlers = this.handlers[aName];
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201 if (!handlers)
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202 return;
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203
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204 //FIXME Better idea than passing the context as argument?
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205 for (var i = 0; i < handlers.length; i++)
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206 handlers[i](aData, this);
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207
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208 if (aName.match('sendiq:'))
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209 delete this.handlers[aName];
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210 };
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211 /**
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212 * @function Register an event handler.
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213 * @param {String} aName The event name.
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214 * @param {Function} aCallback The callback to call when the event is emitted.
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215 */
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216 this.on = function(aName, callback) {
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217 if (!this.handlers[aName])
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218 this.handlers[aName] = [];
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219 this.handlers[aName].push(callback);
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220 };
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221 //FIXME do this!
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222 //~ this.once = function(name, callback) {
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223 //~ if(!this.handlers[name])
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224 //~ this.handlers[name] = [];
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225 //~ this.handlers[name].push(callback);
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226 //~ };
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227 this.on('stream:features', function(stanza, that) {
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228 var nodes = stanza.querySelectorAll('mechanism');
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229 //SASL/Auth features
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230 if (nodes.length > 0) {
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231 that.emit('mechanisms', stanza);
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232 var mechanisms = {};
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233 for (var i = 0; i < nodes.length; i++)
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234 mechanisms[nodes[i].textContent] = true;
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235
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236
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237 //FIXME support SCRAM-SHA1 && allow specify method preferences
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238 if ('DIGEST-MD5' in mechanisms)
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239 that.send(
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240 "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl'\
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241 mechanism='DIGEST-MD5'/>"
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242 );
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243 else if ('PLAIN' in mechanisms) {
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244 var token = btoa(
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245 that.jid +
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246 '\u0000' +
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247 that.jid.node +
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248 '\u0000' +
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249 that.password
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250 );
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251 that.send(
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252 "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl'\
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253 mechanism='PLAIN'>" + token + '</auth>'
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254 );
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255 }
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256 }
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257 //XMPP features
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258 else {
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259 that.emit('features', stanza);
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260 //Bind http://xmpp.org/rfcs/rfc3920.html#bind
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261 that.send(
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262 "<iq type='set' xmlns='jabber:client'>\
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263 <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>\
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264 </iq>",
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265 function() {
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266 //Session http://xmpp.org/rfcs/rfc3921.html#session
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267 that.send(
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268 "<iq type='set' xmlns='jabber:client'>\
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269 <session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>\
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270 </iq>",
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271 function() {
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272 that.emit('connected');
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273 }
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274 );
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275 });
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276 }
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277 });
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278 this.on('success', function(stanza, that) {
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279 that.send(
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280 "<stream:stream to='" + that.domain + "'\
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281 xmlns='jabber:client'\
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282 xmlns:stream='http://etherx.jabber.org/streams'\
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283 version='1.0' />"
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284 );
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285 });
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286 this.on('failure', function(stanza, that) {
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287 that.emit('conn-error', stanza.firstChild.tagName);
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288 });
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289 this.on('challenge', function(stanza, that) {
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290 //FIXME this is mostly Strophe code
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291
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292 function _quote(str) {
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293 return '"' + str.replace(/\\/g, '\\\\').replace(/"/g, '\\"') + '"';
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294 };
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295
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296 var challenge = atob(stanza.textContent);
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297
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298 var attribMatch = /([a-z]+)=("[^"]+"|[^,"]+)(?:,|$)/;
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299
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300 var cnonce = MD5.hexdigest(Math.random() * 1234567890);
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301 var realm = '';
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302 var host = null;
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303 var nonce = '';
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304 var qop = '';
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305 var matches;
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306
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307 while (challenge.match(attribMatch)) {
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308 matches = challenge.match(attribMatch);
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309 challenge = challenge.replace(matches[0], '');
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310 matches[2] = matches[2].replace(/^"(.+)"$/, '$1');
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311 switch (matches[1]) {
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312 case 'realm':
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313 realm = matches[2];
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314 break;
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315 case 'nonce':
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316 nonce = matches[2];
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317 break;
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318 case 'qop':
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319 qop = matches[2];
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320 break;
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321 case 'host':
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322 host = matches[2];
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323 break;
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324 }
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325 }
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326
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327 var digest_uri = 'xmpp/' + that.domain;
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328 if (host !== null) {
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329 digest_uri = digest_uri + '/' + host;
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330 }
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331 var A1 = MD5.hash(that.node +
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332 ':' + realm + ':' + that.password) +
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333 ':' + nonce + ':' + cnonce;
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334 var A2 = 'AUTHENTICATE:' + digest_uri;
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335
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336 var responseText = '';
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337 responseText += 'username=' + _quote(that.node) + ',';
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338 responseText += 'realm=' + _quote(realm) + ',';
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339 responseText += 'nonce=' + _quote(nonce) + ',';
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340 responseText += 'cnonce=' + _quote(cnonce) + ',';
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341 responseText += 'nc="00000001",';
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342 responseText += 'qop="auth",';
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343 responseText += 'digest-uri=' + _quote(digest_uri) + ',';
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344 responseText += 'response=' + _quote(
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345 MD5.hexdigest(MD5.hexdigest(A1) + ':' +
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346 nonce + ':00000001:' +
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347 cnonce + ':auth:' +
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348 MD5.hexdigest(A2))) + ',';
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349 responseText += 'charset="utf-8"';
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350 that.send(
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351 "<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>"
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352 + btoa(responseText) +
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353 '</response>');
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354 });
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355 };