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annotate modules/twitter.js @ 283:ae23e6f323db

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refresh twitter every three minutes
author Myk Melez <myk@mozilla.org>
date Mon, 01 Sep 2008 20:15:33 -0700
parents 76ee747a1dba
children 113312a23f53
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* ***** BEGIN LICENSE BLOCK *****
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2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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3 *
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4 * The contents of this file are subject to the Mozilla Public License Version
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5 * 1.1 (the "License"); you may not use this file except in compliance with
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6 * the License. You may obtain a copy of the License at
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7 * http://www.mozilla.org/MPL/
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8 *
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9 * Software distributed under the License is distributed on an "AS IS" basis,
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10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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11 * for the specific language governing rights and limitations under the
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12 * License.
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13 *
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14 * The Original Code is Snowl.
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15 *
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16 * The Initial Developer of the Original Code is Mozilla.
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17 * Portions created by the Initial Developer are Copyright (C) 2008
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18 * the Initial Developer. All Rights Reserved.
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19 *
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20 * Contributor(s):
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21 * Myk Melez <myk@mozilla.org>
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22 *
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23 * Alternatively, the contents of this file may be used under the terms of
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24 * either the GNU General Public License Version 2 or later (the "GPL"), or
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25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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26 * in which case the provisions of the GPL or the LGPL are applicable instead
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27 * of those above. If you wish to allow use of your version of this file only
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28 * under the terms of either the GPL or the LGPL, and not to allow others to
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29 * use your version of this file under the terms of the MPL, indicate your
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30 * decision by deleting the provisions above and replace them with the notice
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31 * and other provisions required by the GPL or the LGPL. If you do not delete
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32 * the provisions above, a recipient may use your version of this file under
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33 * the terms of any one of the MPL, the GPL or the LGPL.
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34 *
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35 * ***** END LICENSE BLOCK ***** */
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36
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37 let EXPORTED_SYMBOLS = ["SnowlTwitter"];
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38
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39 const Cc = Components.classes;
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40 const Ci = Components.interfaces;
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41 const Cr = Components.results;
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42 const Cu = Components.utils;
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43
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44 // modules that come with Firefox
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45 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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46 Cu.import("resource://gre/modules/ISO8601DateUtils.jsm");
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47
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48 // modules that should come with Firefox
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49 Cu.import("resource://snowl/modules/log4moz.js");
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50 Cu.import("resource://snowl/modules/Observers.js");
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51 Cu.import("resource://snowl/modules/URI.js");
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52
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53 // Snowl-specific modules
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54 Cu.import("resource://snowl/modules/datastore.js");
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55 Cu.import("resource://snowl/modules/source.js");
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56 Cu.import("resource://snowl/modules/identity.js");
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57 Cu.import("resource://snowl/modules/message.js");
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58
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59 // FIXME: factor this out into a common file.
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60 const PART_TYPE_CONTENT = 1;
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61 const PART_TYPE_SUMMARY = 2;
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62
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63 const NAME = "Twitter";
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64 const MACHINE_URI = URI.get("https://twitter.com");
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65 // XXX Should this be simply http://twitter.com ?
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66 const HUMAN_URI = URI.get("http://twitter.com/home");
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67
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68 function SnowlTwitter(aID, aName, aMachineURI, aHumanURI, aLastRefreshed, aImportance) {
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69 // XXX Should we append the username to the NAME const to enable users
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70 // to subscribe to multiple Twitter accounts?
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71
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72 // Call the superclass's constructor to initialize the new instance.
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73 SnowlSource.call(this, aID, NAME, MACHINE_URI, HUMAN_URI, aLastRefreshed, aImportance);
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74 }
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75
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76 SnowlTwitter.prototype = {
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77 // How often to refresh sources, in milliseconds.
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78 refreshInterval: 1000 * 60 * 3, // 30 minutes
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79
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80 constructor: SnowlTwitter,
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81
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82 __proto__: SnowlSource.prototype,
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83
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84 _log: Log4Moz.Service.getLogger("Snowl.Twitter"),
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85
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86 // Observer Service
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87 get _obsSvc() {
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88 let obsSvc = Cc["@mozilla.org/observer-service;1"].
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89 getService(Ci.nsIObserverService);
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90 this.__defineGetter__("_obsSvc", function() { return obsSvc });
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91 return this._obsSvc;
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92 },
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93
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94
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95 //**************************************************************************//
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96 // Notification Callbacks for Authentication
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97
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98 // FIXME: factor this out with the equivalent code in feed.js.
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99
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100 // If we prompt the user to authenticate, and the user asks us to remember
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101 // their password, we store the nsIAuthInformation in this property until
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102 // the request succeeds, at which point we store it with the login manager.
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103 _authInfo: null,
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104
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105 // Logins from the login manager that we try in turn until we run out of them
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106 // or one of them works.
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107 // XXX Should we only try the username the user entered when they originally
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108 // subscribed to the source? After all, different usernames could result in
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109 // different content, and it might not be what the user expects.
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110 _logins: null,
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111 _loginIndex: 0,
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112
190
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113 // nsISupports
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114
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115 QueryInterface: XPCOMUtils.generateQI([Ci.nsIAuthPrompt2]),
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116
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117 // nsIInterfaceRequestor
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118
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119 getInterface: function(iid) {
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120 return this.QueryInterface(iid);
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121 },
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122
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123 // nsIAuthPrompt2
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124
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125 promptAuth: function(channel, level, authInfo) {
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126 // Check saved logins before prompting the user. We get them
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127 // from the login manager and try each in turn until one of them works
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128 // or we run out of them.
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129 if (!this._logins) {
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130 let lm = Cc["@mozilla.org/login-manager;1"].getService(Ci.nsILoginManager);
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131 // XXX Should we be using channel.URI.prePath in case the old URI
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132 // redirects us to a new one at a different hostname?
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133 this._logins = lm.findLogins({}, this.machineURI.prePath, null, authInfo.realm);
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134 }
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135
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136 let login = this._logins[this._loginIndex];
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137 if (login) {
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138 authInfo.username = login.username;
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139 authInfo.password = login.password;
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140 ++this._loginIndex;
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141 return true;
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142 }
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143
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144 // If we've made it this far, none of the saved logins worked, so we prompt
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145 // the user to provide one.
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146 let args = Cc["@mozilla.org/supports-array;1"].createInstance(Ci.nsISupportsArray);
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147 args.AppendElement({ wrappedJSObject: this });
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148 args.AppendElement(authInfo);
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149
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150 // |result| is how the dialog passes information back to us. It sets two
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151 // properties on the object: |proceed|, which we return from this function,
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152 // and which determines whether or not authentication can proceed using
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153 // the values entered by the user; and |remember|, which determines whether
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154 // or not we save the user's login with the login manager once the request
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155 // succeeds.
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156 let result = {};
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157 args.AppendElement({ wrappedJSObject: result });
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158
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159 let ww = Cc["@mozilla.org/embedcomp/window-watcher;1"].getService(Ci.nsIWindowWatcher);
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160 ww.openWindow(null,
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161 "chrome://snowl/content/login.xul",
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162 null,
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163 "chrome,centerscreen,dialog,modal",
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164 args);
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165
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166 if (result.remember)
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167 this._authInfo = authInfo;
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168
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169 return result.proceed;
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170 },
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171
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172 asyncPromptAuth: function() {
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173 throw Cr.NS_ERROR_NOT_IMPLEMENTED;
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174 },
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175
193
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176
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177 //**************************************************************************//
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178 // Subscription
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179
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180 subscribe: function(credentials) {
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181 Observers.notify(this, "snowl:subscribe:connect:start", null);
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182
190
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183 let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance();
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184
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185 request.QueryInterface(Ci.nsIDOMEventTarget);
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186 let t = this;
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187 request.addEventListener("load", function(e) { t.onSubscribeLoad(e) }, false);
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188 request.addEventListener("error", function(e) { t.onSubscribeError(e) }, false);
190
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189
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190 request.QueryInterface(Ci.nsIXMLHttpRequest);
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191
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192 request.open("GET", this.machineURI.spec + "/account/verify_credentials.json", true);
193
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193
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194 // We could just set the Authorization request header here, but then
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195 // we wouldn't get an nsIAuthInformation object through our notification
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196 // callbacks, so we'd have to parse the WWW-Authenticate header ourselves
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197 // to extract the realm to use when saving the credentials to the login
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198 // manager, and WWW-Authenticate header parsing is said to be tricky.
190
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199
193
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200 // So instead we define notification callbacks that fill in (and persist)
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201 // an nsIAuthInformation object the first time they are called (subsequent
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202 // attempts fail, though, to avoid an infinite loop with a server that keeps
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203 // rejecting our credentials along with a Mozilla that keeps prompting
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204 // for them).
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205 request.channel.notificationCallbacks = {
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206 QueryInterface: XPCOMUtils.generateQI([Ci.nsIAuthPrompt2]),
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207 getInterface: function(iid) { return this.QueryInterface(iid) },
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208 _firstAttempt: true,
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209 promptAuth: function(channel, level, authInfo) {
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210 if (!this._firstAttempt) {
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211 if (credentials.remember)
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212 this._authInfo = null;
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213 return false;
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214 }
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215 authInfo.username = credentials.username;
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216 authInfo.password = credentials.password;
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217 if (credentials.remember)
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218 this._authInfo = authInfo;
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219 this._firstAttempt = false;
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220 return true;
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221 },
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222 asyncPromptAuth: function() { throw Cr.NS_ERROR_NOT_IMPLEMENTED }
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223 };
190
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224
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225 request.send(null);
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226 },
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227
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228 onSubscribeLoad: function(event) {
190
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229 let request = event.target;
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230
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231 // request.responseText should be: {"authorized":true}
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232 this._log.info("onSubscribeLoad: " + request.responseText);
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233
190
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234 // If the request failed, let the error handler handle it.
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235 // XXX Do we need this? Don't such failures call the error handler directly?
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236 if (request.status < 200 || request.status > 299) {
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237 this.onSubscribeError(event);
190
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238 return;
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239 }
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240
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241 // XXX What's the right way to handle this?
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242 if (request.responseText.length == 0) {
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243 this.onSubscribeError(event);
190
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244 return;
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245 }
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246
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247 Observers.notify(this, "snowl:subscribe:connect:end", request.status);
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248
190
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249 // _authInfo only gets set if we prompted the user to authenticate
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250 // and the user checked the "remember password" box. Since we're here,
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251 // it means the request succeeded, so we save the login.
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252 if (this._authInfo)
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253 this._saveLogin();
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254
205
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255 // Save the source to the database.
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256 this.persist();
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257
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258 // Let observers know about the new source.
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259 this._obsSvc.notifyObservers(null, "sources:changed", null);
205
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260
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261 this.refresh();
190
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262 },
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263
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264 onSubscribeError: function(event) {
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265 let request = event.target;
190
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266
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267 // request.responseText should be: Could not authenticate you.
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268 this._log.info("onSubscribeError: " + request.responseText);
190
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269
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270 // Sometimes an attempt to retrieve status text throws NS_ERROR_NOT_AVAILABLE.
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271 let statusText = "";
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272 try {
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273 statusText = request.statusText;
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274 }
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275 catch(ex) {}
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276
193
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277 this._log.error("onSubscribeError: " + request.status + " (" + statusText + ")");
190
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278
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279 Observers.notify(this, "snowl:subscribe:connect:end", request.status);
190
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280 },
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281
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282
193
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283 //**************************************************************************//
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284 // Refreshment
190
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285
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286 refresh: function() {
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287 Observers.notify(this, "snowl:subscribe:get:start", null);
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288
190
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289 let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance();
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290
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291 request.QueryInterface(Ci.nsIDOMEventTarget);
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292 let t = this;
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293 request.addEventListener("load", function(e) { t.onRefreshLoad(e) }, false);
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294 request.addEventListener("error", function(e) { t.onRefreshError(e) }, false);
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295
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296 request.QueryInterface(Ci.nsIXMLHttpRequest);
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297
193
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298 // FIXME: use the count parameter to retrieve more messages at once.
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299 // FIXME: use the since or since_id parameter to retrieve only new messages.
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300 // http://groups.google.com/group/twitter-development-talk/web/api-documentation
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301 request.open("GET", this.machineURI.spec + "/statuses/friends_timeline.json", true);
190
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302
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303 // Register a listener for notification callbacks so we handle authentication.
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304 request.channel.notificationCallbacks = this;
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305
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306 request.send(null);
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307 },
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308
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309 onRefreshLoad: function(event) {
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310 let request = event.target;
190
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311
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312 // If the request failed, let the error handler handle it.
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313 // XXX Do we need this? Don't such failures call the error handler directly?
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314 if (request.status < 200 || request.status > 299) {
193
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315 this.onRefreshError(event);
190
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316 return;
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317 }
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318
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319 // XXX What's the right way to handle this?
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320 if (request.responseText.length == 0) {
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321 this.onRefreshError(event);
190
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322 return;
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323 }
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324
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325 // _authInfo only gets set if we prompted the user to authenticate
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326 // and the user checked the "remember password" box. Since we're here,
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327 // it means the request succeeded, so we save the login.
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328 if (this._authInfo)
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329 this._saveLogin();
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330
193
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331 this._processRefresh(request.responseText);
190
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332 },
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333
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334 onRefreshError: function(event) {
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335 let request = event.target;
190
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336
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337 // Sometimes an attempt to retrieve status text throws NS_ERROR_NOT_AVAILABLE
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338 let statusText = "";
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339 try {
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340 statusText = request.statusText;
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341 }
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342 catch(ex) {}
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343
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344 this._log.error("onRefreshError: " + request.status + " (" + statusText + ")");
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345 },
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346
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347 _processRefresh: function(responseText) {
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348 // Now that we know we successfully downloaded the source and obtained
190
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349 // a result from it, update the "last refreshed" timestamp.
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350 this.lastRefreshed = new Date();
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351
193
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352 var JSON = Cc["@mozilla.org/dom/json;1"].createInstance(Ci.nsIJSON);
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353 let messages = JSON.decode(responseText);
190
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354
193
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355 let currentMessages = [];
190
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356 let messagesChanged = false;
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357
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358 SnowlDatastore.dbConnection.beginTransaction();
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359 try {
193
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360 for each (let message in messages) {
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361 let externalID = message.id;
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362 let internalID = this._getInternalIDForExternalID(externalID);
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363 if (internalID) {
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364 currentMessages.push(internalID);
190
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365 continue;
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366 }
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367
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368 messagesChanged = true;
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369 this._log.info(this.name + " adding message " + externalID);
260
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370 internalID = this._addMessage(message, this.lastRefreshed);
193
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371 currentMessages.push(internalID);
190
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372 }
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373
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374 // Update the current flag.
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375 // XXX Should this affect whether or not messages have changed?
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376 SnowlDatastore.dbConnection.executeSimpleSQL("UPDATE messages SET current = 0 WHERE sourceID = " + this.id);
193
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377 SnowlDatastore.dbConnection.executeSimpleSQL("UPDATE messages SET current = 1 WHERE id IN (" + currentMessages.join(", ") + ")");
190
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378
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379 SnowlDatastore.dbConnection.commitTransaction();
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380 }
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381 catch(ex) {
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382 SnowlDatastore.dbConnection.rollbackTransaction();
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383 throw ex;
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384 }
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385
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386 if (messagesChanged)
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387 this._obsSvc.notifyObservers(null, "messages:changed", null);
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388
205
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389 // FIXME: if we added people, refresh the collections view too.
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diff changeset
390
190
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391 Observers.notify(this, "snowl:subscribe:get:end", null);
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392 },
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393
260
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394 _addMessage: function(message, aReceived) {
208
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395 // We store the message text as both the subject and the content so that
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396 // the content shows up in the Subject column of the list view.
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397 // FIXME: make the list view automatically display some of the content
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398 // if the subject is missing so we don't have to duplicate storage here.
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399 let subject = message.text;
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400
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401 // Get an existing identity or create a new one. Creating an identity
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402 // automatically creates a person record with the provided name.
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403 let identity = SnowlIdentity.get(this.id, message.user.id) ||
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404 SnowlIdentity.create(this.id,
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405 message.user.id,
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406 message.user.screen_name,
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407 message.user.url,
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diff changeset
408 message.user.profile_image_url);
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409 // FIXME: update the identity record with the latest info about the person.
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410 //identity.updateProperties(this.machineURI, message.user);
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411 let authorID = identity.personID;
190
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412
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413 let timestamp = new Date(message.created_at);
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414
208
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415 // Add the message.
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416 let messageID = this.addSimpleMessage(this.id, message.id, subject, authorID, timestamp, aReceived, null);
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417
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418 // Add the message's content.
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419 this.addPart(messageID, PART_TYPE_CONTENT, message.text, null, null, "text/plain");
190
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420
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421 // Add the message's metadata.
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422 for (let [name, value] in Iterator(message)) {
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423 // Ignore properties we have already handled specially.
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424 // XXX Should we add them anyway, which is redundant info but lets others
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425 // (who don't know about our special treatment) access them?
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426 if (["user", "created_at", "text"].indexOf(name) != -1)
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427 continue;
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428
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429 // FIXME: populate a "recipient" field with in_reply_to_user_id.
190
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430
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431 this._addMetadatum(messageID, name, value);
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432 }
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433
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434 Observers.notify(SnowlMessage.get(messageID), "snowl:message:added", null);
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435
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436 return messageID;
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437 },
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438
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439 // FIXME: Make the rest of this stuff be part of a superclass from which
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440 // this class is derived.
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441
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442 /**
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443 * Get the internal ID of the message with the given external ID.
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444 *
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445 * @param aExternalID {string}
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446 * the external ID of the message
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447 *
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448 * @returns {number}
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449 * the internal ID of the message, or undefined if the message
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450 * doesn't exist
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451 */
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452 _getInternalIDForExternalID: function(aExternalID) {
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453 // FIXME: external IDs may be source-specific, as some sources
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454 // (like Twitter) don't use globally-unique IDs (unlike feeds, which
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455 // generally do), so handle non-globally unique IDs correctly.
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456 return SnowlDatastore.selectInternalIDForExternalID(aExternalID);
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457 },
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458
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459 /**
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460 * Add a message with a single part to the datastore.
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461 *
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462 * @param aSourceID {integer} the record ID of the message source
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463 * @param aExternalID {string} the external ID of the message
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464 * @param aSubject {string} the title of the message
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465 * @param aAuthorID {string} the author of the message
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466 * @param aTimestamp {Date} the date/time when the message was sent
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467 * @param aReceived {Date} the date/time when the message was received
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468 * @param aLink {nsIURI} a link to the content of the message,
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469 * if the content is hosted on a server
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470 *
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471 * @returns {integer} the internal ID of the newly-created message
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472 */
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473 addSimpleMessage: function(aSourceID, aExternalID, aSubject, aAuthorID,
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474 aTimestamp, aReceived, aLink) {
190
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475 // Convert the link to its string spec, which is how we store it
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476 // in the datastore.
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477 let link = aLink ? aLink.spec : null;
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478
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479 let messageID =
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480 SnowlDatastore.insertMessage(aSourceID, aExternalID, aSubject, aAuthorID,
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481 aTimestamp, aReceived, link);
190
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482
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483 return messageID;
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484 },
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485
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486 get _addPartStatement() {
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487 let statement = SnowlDatastore.createStatement(
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488 "INSERT INTO parts(messageID, partType, content, baseURI, languageCode, mediaType) \
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489 VALUES (:messageID, :partType, :content, :baseURI, :languageCode, :mediaType)"
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490 );
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491 this.__defineGetter__("_addPartStatement", function() { return statement });
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492 return this._addPartStatement;
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493 },
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494
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495 addPart: function(aMessageID, aPartType, aContent, aBaseURI, aLanguageCode,
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496 aMediaType) {
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497 this._addPartStatement.params.messageID = aMessageID;
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498 this._addPartStatement.params.partType = aPartType;
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499 this._addPartStatement.params.content = aContent;
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500 this._addPartStatement.params.baseURI = aBaseURI;
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501 this._addPartStatement.params.languageCode = aLanguageCode;
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502 this._addPartStatement.params.mediaType = aMediaType;
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503 this._addPartStatement.execute();
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504
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505 return SnowlDatastore.dbConnection.lastInsertRowID;
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506 },
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507
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508 _addMetadatum: function(aMessageID, aAttributeName, aValue) {
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509 // FIXME: speed this up by caching the list of known attributes.
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510 let attributeID = SnowlDatastore.selectAttributeID(aAttributeName)
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511 || SnowlDatastore.insertAttribute(aAttributeName);
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512 SnowlDatastore.insertMetadatum(aMessageID, attributeID, aValue);
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513 },
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514
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515 // FIXME: factor this out with the identical function in feed.js.
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516 _saveLogin: function() {
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517 let lm = Cc["@mozilla.org/login-manager;1"].getService(Ci.nsILoginManager);
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518
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519 // Create a new login with the auth information we obtained from the user.
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520 let LoginInfo = new Components.Constructor("@mozilla.org/login-manager/loginInfo;1",
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521 Ci.nsILoginInfo,
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522 "init");
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523 // XXX Should we be using channel.URI.prePath in case the old URI
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524 // redirects us to a new one at a different hostname?
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525 let newLogin = new LoginInfo(this.machineURI.prePath,
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526 null,
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527 this._authInfo.realm,
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528 this._authInfo.username,
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529 this._authInfo.password,
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530 "",
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531 "");
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532
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533 // Get existing logins that have the same hostname and realm.
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534 let logins = lm.findLogins({}, this.machineURI.prePath, null, this._authInfo.realm);
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535
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536 // Try to figure out if we should replace one of the existing logins.
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537 // If there's only one existing login, we replace it. Otherwise, if
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538 // there's a login with the same username, we replace that. Otherwise,
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539 // we add the new login instead of replacing an existing one.
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540 let oldLogin;
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541 if (logins.length == 1)
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542 oldLogin = logins[0];
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543 else if (logins.length > 1)
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544 oldLogin = logins.filter(function(v) v.username == this._authInfo.username)[0];
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545
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546 if (oldLogin)
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547 lm.modifyLogin(oldLogin, newLogin);
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548 else
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549 lm.addLogin(newLogin);
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550
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551 // Now that we've saved the login, we don't need the auth info anymore.
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552 this._authInfo = null;
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553 }
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554
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555 };