Mercurial > eldonilo > lightstring

annotate lightstring.js @ 97:11e38a9bfe38

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multi-transport is now possible
author Sonny Piers <sonny.piers@gmail.com>
date Tue, 12 Jun 2012 16:35:27 +0200
parents b211a00efa7f
children f14558915187
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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 var Lightstring = {
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21 /**
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22 * @namespace Holds XMPP namespaces.
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23 * @description http://xmpp.org/xmpp-protocols/protocol-namespaces
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24 */
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25 ns: {
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26 streams: 'http://etherx.jabber.org/streams',
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27 jabber_client: 'jabber:client',
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28 xmpp_stanzas: 'urn:ietf:params:xml:ns:xmpp-stanzas'
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29 },
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30 /**
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31 * @namespace Holds XMPP stanza builders.
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32 */
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33 stanzas: {
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34 stream: {
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35 open: function(aService) {
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36 return "<stream:stream to='" + aService + "'" +
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37 " xmlns='" + Lightstring.ns['jabber_client'] + "'" +
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38 " xmlns:stream='" + Lightstring.ns['streams'] + "'" +
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39 " version='1.0'>";
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40 },
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41 close: function() {
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42 return "</stream:stream>";
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43 }
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44 },
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45 errors: {
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46 iq: function(from, id, type, error) {
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47 return "<iq to='" + from + "'" +
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48 " id='" + id + "'" +
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49 " type='error'>" +
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50 "<error type='" + type + "'>" +
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51 "<" + error + " xmlns='" + Lightstring.ns['xmpp_stanzas'] + "'/>" + //TODO: allow text content.
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52 //TODO: allow text and payload.
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53 "</error>" +
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54 "</iq>";
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55 }
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56 }
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57 },
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58 /**
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59 * @namespace Holds Lightstring plugins
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60 */
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61 plugins: {},
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62 /**
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63 * @private
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64 */
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65 parser: new DOMParser(),
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66 /**
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67 * @private
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68 */
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69 serializer: new XMLSerializer(),
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70 /**
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71 * @function Transforms a XML string to a DOM object.
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72 * @param {String} aString XML string.
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73 * @return {Object} Domified XML.
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74 */
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75 XML2DOM: function(aString) {
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76 var DOM = null;
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77 try {
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78 DOM = this.parser.parseFromString(aString, 'text/xml').documentElement;
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79 }
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80 catch (e) {
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81 //TODO: error
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82 }
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83 finally {
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84 return DOM;
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85 };
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86 },
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87 /**
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88 * @function Transforms a DOM object to a XML string.
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89 * @param {Object} aString DOM object.
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90 * @return {String} Stringified DOM.
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91 */
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92 DOM2XML: function(aElement) {
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93 var XML = null;
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94 try {
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95 XML = this.serializer.serializeToString(aElement);
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96 }
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97 catch (e) {
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98 //TODO: error
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99 }
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100 finally {
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101 return XML;
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102 };
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103 },
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104 /**
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105 * @function Get an unique identifier.
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106 * @param {String} [aString] Prefix to put before the identifier.
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107 * @return {String} Identifier.
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108 */
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109 newId: (function() {
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110 var id = 1024;
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111 return function(prefix) {
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112 if (typeof prefix === 'string')
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113 return prefix + id++;
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114 return '' + id++;
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115 };
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116 })()
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117 };
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118
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119 /**
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120 * @constructor Creates a new Lightstring connection
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121 * @param {String} [aService] The Websocket service URL.
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122 * @memberOf Lightstring
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123 */
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124 Lightstring.Connection = function(aService) {
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125 if (aService)
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126 this.service = aService;
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127 /**
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128 * @namespace Holds connection events handlers
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129 */
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130 this.handlers = {};
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131 /**
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132 * @namespace Holds connection iq callbacks
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133 */
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134 this.callbacks = {};
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135 };
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136 Lightstring.Connection.prototype = {
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137 /**
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138 * @function Create and open a websocket then go though the XMPP authentification process.
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139 * @param {String} [aJid] The JID (Jabber id) to use.
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140 * @param {String} [aPassword] The associated password.
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141 */
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142 connect: function(aJid, aPassword) {
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143 this.emit('connecting');
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144 this.jid = new Lightstring.JID(aJid);
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145 if (aPassword)
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146 this.password = aPassword;
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147
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148 if (!this.jid.bare)
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149 return; //TODO: error
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150 if (!this.service)
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151 return; //TODO: error
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152
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153 function getProtocol(aURL) {
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154 var a = document.createElement('a');
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155 a.href = aURL;
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156 return a.protocol.replace(':', '');
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157 }
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158 var protocol = getProtocol(this.service);
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159
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160 if (protocol.match('http'))
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161 this.connection = new Lightstring.BOSHConnection(this.service);
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162 else if (protocol.match('ws'))
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163 this.connection = new Lightstring.WebSocketConnection(this.service);
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164
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165 this.connection.connect();
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166
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167 var that = this;
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168
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169 this.connection.once('open', function() {
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170 var stream = Lightstring.stanzas.stream.open(that.jid.domain);
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171 that.connection.send(stream);
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172 var stanza = {
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173 XML: stream
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174 };
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175 that.emit('output', stanza);
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176 });
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177 this.connection.on('stanza', function(stanza) {
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178 var stanza = new Lightstring.Stanza(stanza);
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179
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180 //FIXME: node-xmpp-bosh sends a self-closing stream:stream tag; it is wrong!
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181 that.emit('input', stanza);
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182
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183 if (!stanza.DOM)
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184 return;
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185
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186 var name = stanza.DOM.localName;
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187
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188 //Authentication
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189 //FIXME SASL mechanisms and XMPP features can be both in a stream:features
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190 if (name === 'features') {
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191 //SASL mechanisms
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192 if (stanza.DOM.firstChild.localName === 'mechanisms') {
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193 stanza.mechanisms = [];
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194 var nodes = stanza.DOM.getElementsByTagName('mechanism');
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195 for (var i = 0; i < nodes.length; i++)
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196 stanza.mechanisms.push(nodes[i].textContent);
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197 that.emit('mechanisms', stanza);
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198 }
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199 //XMPP features
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200 else {
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201 //TODO: stanza.features
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202 that.emit('features', stanza);
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203 }
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204 }
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205 else if (name === 'challenge') {
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206 that.emit('challenge', stanza);
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207 }
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208 else if (name === 'failure') {
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209 that.emit('failure', stanza);
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210 }
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211 else if (name === 'success') {
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212 that.emit('success', stanza);
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213 }
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214
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215 //Iq callbacks
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216 else if (name === 'iq') {
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217 var payload = stanza.DOM.firstChild;
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218 if (payload)
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219 that.emit('iq/' + payload.namespaceURI + ':' + payload.localName, stanza);
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220
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221 var id = stanza.DOM.getAttribute('id');
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222 if (!(id && id in that.callbacks))
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223 return;
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224
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225 var type = stanza.DOM.getAttribute('type');
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226 if (type !== 'result' && type !== 'error')
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227 return; //TODO: warning
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228
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229 var callback = that.callbacks[id];
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230 if (type === 'result' && callback.success)
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231 callback.success.call(that, stanza);
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232 else if (type === 'error' && callback.error)
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233 callback.error.call(that, stanza);
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234
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235 delete that.callbacks[id];
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236 }
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237
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238 else if (name === 'presence' || name === 'message') {
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239 that.emit(name, stanza);
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240 }
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241 });
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242 },
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243 /**
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244 * @function Send a message.
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245 * @param {String|Object} aStanza The message to send.
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246 * @param {Function} [aCallback] Executed on answer. (stanza must be iq)
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247 */
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248 send: function(aStanza, aSuccess, aError) {
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249 if (!(aStanza instanceof Lightstring.Stanza))
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250 var stanza = new Lightstring.Stanza(aStanza);
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251 else
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252 var stanza = aStanza;
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253
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254 if (!stanza)
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255 return;
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256
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257 if (stanza.DOM.tagName === 'iq') {
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258 var type = stanza.DOM.getAttribute('type');
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259 if (type !== 'get' || type !== 'set')
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260 ; //TODO: error
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261
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262 var callback = {success: aSuccess, error: aError};
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263
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264 var id = stanza.DOM.getAttribute('id');
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265 if (!id) {
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266 var id = Lightstring.newId('sendiq:');
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267 stanza.DOM.setAttribute('id', id);
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268 }
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269
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270 this.callbacks[id] = callback;
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271
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272 }
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273 else if (aSuccess || aError)
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274 ; //TODO: warning (no callback without iq)
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275
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276
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277 //FIXME this.socket.send(stanza.XML); (need some work on Lightstring.Stanza)
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278 var fixme = Lightstring.DOM2XML(stanza.DOM);
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279 stanza.XML = fixme;
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280 this.connection.send(fixme);
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281 this.emit('output', stanza);
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282 },
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283 /**
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284 * @function Closes the XMPP stream and the socket.
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285 */
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286 disconnect: function() {
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287 this.emit('disconnecting');
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288 var stream = Lightstring.stanzas.stream.close();
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289 this.socket.send(stream);
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290 this.emit('XMLOutput', stream);
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291 this.socket.close();
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292 },
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293 load: function() {
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294 for (var i = 0; i < arguments.length; i++) {
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295 var name = arguments[i];
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296 if (!(name in Lightstring.plugins))
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297 continue; //TODO: error
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298
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299 var plugin = Lightstring.plugins[name];
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300
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301 //Namespaces
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302 for (var ns in plugin.namespaces)
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303 Lightstring.ns[ns] = plugin.namespaces[ns];
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304
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305 //Stanzas
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306 Lightstring.stanzas[name] = {};
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307 for (var stanza in plugin.stanzas)
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308 Lightstring.stanzas[name][stanza] = plugin.stanzas[stanza];
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309
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310 //Handlers
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311 for (var handler in plugin.handlers)
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312 this.on(handler, plugin.handlers[handler]);
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313
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314 //Methods
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315 this[name] = {};
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316 for (var method in plugin.methods)
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317 this[name][method] = plugin.methods[method].bind(this);
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318
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319 if (plugin.init)
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320 plugin.init.apply(this);
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321 }
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322 },
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323 /**
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324 * @function Emits an event.
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325 * @param {String} aName The event name.
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326 * @param {Function|Array|Object} [aData] Data about the event.
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327 */
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328 emit: function(aName, aData) {
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329 var handlers = this.handlers[aName];
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330 if (!handlers)
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331 return;
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332
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333 //Non-data events
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334 if(!aData) {
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335 for (var i = 0; i < handlers.length; i++)
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336 handlers[i].call(this, aData);
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337
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338 return;
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339 }
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340
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341 //Non-iq events
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342 if (aData && aData.DOM && aData.DOM.localName !== 'iq') {
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343 for (var i = 0; i < handlers.length; i++)
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344 handlers[i].call(this, aData);
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345
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346 return;
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347 }
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348
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349 //Iq events
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350 var ret;
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351 for (var i = 0; i < handlers.length; i++) {
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352 ret = handlers[i].call(this, aData);
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353 if (typeof ret !== 'boolean')
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354 return; //TODO: error
62
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355
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356 if (ret)
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357 return;
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358 }
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359
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360 if (aData && aData.DOM) {
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361 var type = aData.DOM.getAttribute('type');
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362 if (type !== 'get' && type !== 'set')
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363 return;
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364
89
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365 var from = aData.DOM.getAttribute('from');
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366 var id = aData.DOM.getAttribute('id');
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367 this.send(Lightstring.stanzas.errors.iq(from, id, 'cancel', 'service-unavailable'));
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368 }
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369 },
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370 /**
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371 * @function Register an event handler.
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372 * @param {String} aName The event name.
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373 * @param {Function} aCallback The callback to call when the event is emitted.
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374 */
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375 on: function(aName, callback) {
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376 if (!this.handlers[aName])
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377 this.handlers[aName] = [];
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378 this.handlers[aName].push(callback);
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379 }
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380 };