Mercurial > eldonilo > lightstring

annotate lightstring.js @ 67:1c8f326fe3ef

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Several fixes and comments updated/added.
author Sonny Piers <sonny.piers@gmail.com>
date Wed, 01 Feb 2012 22:45:48 +0100
parents 2e8fbf3bce7f
children e1ccfb580228
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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 * @description http://xmpp.org/xmpp-protocols/protocol-namespaces
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27 */
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28 ns: {
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29 streams: 'http://etherx.jabber.org/streams',
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30 jabber_client: 'jabber:client'
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31 },
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32 /**
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33 * @namespace Holds XMPP stanza builders.
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34 */
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35 stanzas: {
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36 stream: {
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37 open: function(aService) {
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38 //WORKAROUND: no ending "/" - node-xmpp-bosh bug
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39 return "<stream:stream to='" + aService + "'" +
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40 " xmlns='" + Lightstring.ns['jabber_client'] + "'" +
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41 " xmlns:stream='" + Lightstring.ns['streams'] + "'" +
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42 " version='1.0'/>";
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43 },
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44 close: function() {
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45 return "</stream:stream>";
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46 }
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47 },
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48 errors: {
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49 iq: function(type, error) {
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50 return "<iq to='" + stanza.DOM.getAttributeNS(null, 'from') + "'" +
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51 " id='" + stanza.DOM.getAttributeNS(null, 'id') + "'" +
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52 " type='error'>" +
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53 "<error type='" + type + "'>" +
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54 "<" + error + " xmlns='" + Lightstring.namespaces['xmpp_stanzas'] + "'/>" + //TODO: allow text content.
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55 //TODO: allow text and payload.
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56 "</error>" +
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57 "</iq>";
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58 }
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59 }
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60 },
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61 /**
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62 * @namespace Holds Lightstring plugins
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63 */
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64 plugins: {},
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65 /**
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66 * @private
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67 */
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68 parser: new DOMParser(),
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69 /**
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70 * @private
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71 */
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72 serializer: new XMLSerializer(),
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73 /**
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74 * @function Transforms a XML string to a DOM object.
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75 * @param {String} aString XML string.
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76 * @return {Object} Domified XML.
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77 */
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78 XML2DOM: function(aString) {
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79 var DOM = null;
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80 try {
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81 DOM = this.parser.parseFromString(aString, 'text/xml').documentElement;
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82 }
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83 catch (e) {
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84 //TODO: error
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85 }
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86 finally {
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87 return DOM;
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88 };
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89 },
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90 /**
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91 * @function Transforms a DOM object to a XML string.
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92 * @param {Object} aString DOM object.
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93 * @return {String} Stringified DOM.
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94 */
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95 DOM2XML: function(aElement) {
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96 var XML = null;
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97 try {
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98 XML = this.serializer.serializeToString(aElement);
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99 }
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100 catch (e) {
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101 //TODO: error
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102 }
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103 finally {
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104 return XML;
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105 };
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106 },
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107 /**
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108 * @function Get an unique identifier.
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109 * @param {String} [aString] Prefix to put before the identifier.
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110 * @return {String} Identifier.
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111 */
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112 newId: (function() {
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113 var id = 1024;
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114 return function(prefix) {
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115 if (typeof prefix === 'string')
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116 return prefix + id++;
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117 return '' + id++;
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118 };
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119 })()
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120 };
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121
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122 /**
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123 * @constructor Creates a new Lightstring connection
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124 * @param {String} [aService] The Websocket service URL.
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125 * @memberOf Lightstring
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126 */
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127 Lightstring.Connection = function(aService) {
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128 if (aService)
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129 this.service = aService;
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130 /**
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131 * @namespace Holds connection events handlers
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132 */
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133 this.handlers = {};
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134 /**
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135 * @namespace Holds connection iq callbacks
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136 */
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137 this.callbacks = {};
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138 };
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139 Lightstring.Connection.prototype = {
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140 /**
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141 * @function Create and open a websocket then go though the XMPP authentification process.
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142 * @param {String} [aJid] The JID (Jabber id) to use.
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143 * @param {String} [aPassword] The associated password.
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144 */
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145 connect: function(aJid, aPassword) {
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146 this.emit('connecting');
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147 this.jid = new Lightstring.JID(aJid);
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148 if (aPassword)
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149 this.password = aPassword;
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150
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151 if (!this.jid.bare)
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152 return; //TODO: error
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153 if (!this.service)
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154 return; //TODO: error
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155
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156 if(typeof(WebSocket) === "function") {
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157 this.socket = new WebSocket(this.service, 'xmpp');
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158 }
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159 else if(typeof(MozWebSocket) === "function") {
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160 this.socket = new MozWebSocket(this.service, 'xmpp');
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161 }
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162 else {
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163 return; //TODO: error
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164 }
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165
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166 var Conn = this;
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167 this.socket.addEventListener('open', function() {
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168 if (this.protocol !== 'xmpp')
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169 return; //TODO: error
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170
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171 var stream = Lightstring.stanzas.stream.open(Conn.jid.domain);
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172 //FIXME: Use Lightstring.Connection.send (problem with parsing steam);
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173 Conn.socket.send(stream);
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174 var stanza = {
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175 XML: stream
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176 };
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177 Conn.emit('output', stanza);
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178 });
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179 this.socket.addEventListener('error', function(e) {
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180 Conn.emit('disconnecting', e.data);
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181 //TODO: error
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182 });
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183 this.socket.addEventListener('close', function(e) {
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184 Conn.emit('disconnected', e.data);
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185 });
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186 this.socket.addEventListener('message', function(e) {
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187 var stanza = new Lightstring.Stanza(e.data);
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188
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189 //FIXME: node-xmpp-bosh sends a self-closing stream:stream tag; it is wrong!
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190 Conn.emit('input', stanza);
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191
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192 if(!stanza.DOM)
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193 return;
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194
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195 var name = stanza.DOM.localName;
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196
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197 //Authentication
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198 //FIXME SASL mechanisms and XMPP features can be both in a stream:features
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199 if (name === 'features') {
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200 //SASL mechanisms
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201 if (stanza.DOM.firstChild.localName === 'mechanisms') {
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202 stanza.mechanisms = [];
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203 var nodes = stanza.DOM.querySelectorAll('mechanism');
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204 for (var i = 0; i < nodes.length; i++)
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205 stanza.mechanisms.push(nodes[i].textContent);
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206 Conn.emit('mechanisms', stanza);
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207 }
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208 //XMPP features
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209 else {
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210 //TODO: stanza.features
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211 Conn.emit('features', stanza);
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212 }
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213 }
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214 else if (name === 'challenge') {
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215 Conn.emit('challenge', stanza);
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216 }
64
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217 else if (name === 'failure') {
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218 Conn.emit('failure', stanza);
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219 }
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220 else if (name === 'success') {
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221 Conn.emit('success', stanza);
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222 }
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223
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224 //Iq callbacks
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225 else if (name === 'iq') {
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226 var payload = stanza.DOM.firstChild;
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227 if (payload)
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228 Conn.emit('iq/' + payload.namespaceURI + ':' + payload.localName, stanza);
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229
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230 var id = stanza.DOM.getAttributeNS(null, 'id');
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231 if (!(id && id in Conn.callbacks))
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232 return;
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233
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234 var type = stanza.DOM.getAttributeNS(null, 'type');
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235 if (type !== 'result' && type !== 'error')
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236 return; //TODO: warning
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237
67
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238 var callback = Conn.callbacks[id];
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239 if (type === 'result' && callback.success)
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240 callback.success(stanza);
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241 else if (type === 'error' && callback.error)
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242 callback.error(stanza);
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243
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244 delete Conn.callbacks[id];
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245 }
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246 });
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247 },
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248 /**
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249 * @function Send a message.
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250 * @param {String|Object} aStanza The message to send.
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251 * @param {Function} [aCallback] Executed on answer. (stanza must be iq)
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252 */
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253 send: function(aStanza, aSuccess, aError) {
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254 if (!(aStanza instanceof Lightstring.Stanza))
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255 var stanza = new Lightstring.Stanza(aStanza);
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256 else
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257 var stanza = aStanza;
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258
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259 if(!stanza)
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260 return;
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261
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262 if (stanza.DOM.tagName === 'iq') {
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263 var type = stanza.DOM.getAttributeNS(null, 'type');
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264 if (type !== 'get' || type !== 'set')
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265 ; //TODO: error
42
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266
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267 var callback = {success: aSuccess, error: aError};
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268
42
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269 var id = stanza.DOM.getAttributeNS(null, 'id');
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270 if (!id)
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271 ; //TODO: warning
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272 else
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273 this.callbacks[id] = callback;
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274
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275 } else if (aSuccess || aError)
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276 ; //TODO: warning (no callback without iq)
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277
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278
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279 //FIXME this.socket.send(stanza.XML); (need some work on Lightstring.Stanza)
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280 var fixme = Lightstring.DOM2XML(stanza.DOM);
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281 stanza.XML = fixme;
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282 this.socket.send(fixme);
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283 this.emit('output', stanza);
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284 },
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285 /**
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286 * @function Closes the XMPP stream and the socket.
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287 */
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288 disconnect: function() {
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289 this.emit('disconnecting');
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290 var stream = Lightstring.stanzas.stream.close();
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291 this.send(stream);
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292 this.emit('XMLOutput', stream);
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293 this.socket.close();
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294 },
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295 load: function() {
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296 for (var i = 0; i < arguments.length; i++) {
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297 var name = arguments[i];
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298 if (!(name in Lightstring.plugins))
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299 continue; //TODO: error
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300
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301 var plugin = Lightstring.plugins[name];
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302
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303 //Namespaces
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304 for (var ns in plugin.namespaces)
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305 Lightstring.ns[ns] = plugin.namespaces[ns];
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306
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307 //Stanzas
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308 Lightstring.stanzas[name] = {};
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309 for (var stanza in plugin.stanzas)
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310 Lightstring.stanzas[name][stanza] = plugin.stanzas[stanza];
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311
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312 //Handlers
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313 for (var handler in plugin.handlers)
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314 this.on(handler, plugin.handlers[handler]);
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315
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316 //Methods
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317 this[name] = {};
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318 for (var method in plugin.methods)
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319 this[name][method].bind(this);
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320
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321 if (plugin.init)
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322 plugin.init();
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323 }
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324 },
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325 /**
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326 * @function Emits an event.
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327 * @param {String} aName The event name.
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328 * @param {Function|Array|Object} [aData] Data about the event.
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329 */
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330 emit: function(aName, aData) {
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331 var handlers = this.handlers[aName];
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332 if (!handlers)
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333 return;
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334
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335 if (aData && aData.DOM && aData.DOM.localName !== 'iq') {
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336 for (var i = 0; i < handlers.length; i++)
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337 handlers[i].call(this, aData);
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338
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339 return;
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340 }
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341
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342 var ret;
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343 for (var i = 0; i < handlers.length; i++) {
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344 ret = handlers[i].call(this, aData);
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345 if (typeof ret !== 'boolean')
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346 return; //TODO: error
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347
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348 if (ret)
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349 return;
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350 }
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351
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352 conn.send(Lightstring.stanzas.errors.iq('cancel', 'service-unavailable'));
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353 },
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354 /**
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355 * @function Register an event handler.
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356 * @param {String} aName The event name.
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357 * @param {Function} aCallback The callback to call when the event is emitted.
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358 */
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359 on: function(aName, callback) {
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360 if (!this.handlers[aName])
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361 this.handlers[aName] = [];
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362 this.handlers[aName].push(callback);
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363 }
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364 };