core.js

   1 /* Copyright (c) 2012 Robert Sesek <http://robert.sesek.com>
   2  *
   3  * Permission is hereby granted, free of charge, to any person obtaining a copy
   4  * of this software and associated documentation files (the "Software"), to
   5  * deal in the Software without restriction, including without limitation the
   6  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   7  * sell copies of the Software, and to permit persons to whom the Software is
   8  * furnished to do so, subject to the following conditions:
   9  *
  10  * The above copyright notice and this permission notice shall be included in
  11  * all copies or substantial portions of the Software.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  18  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  19  * DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 (function main() {
  23   if (typeof chrome !== 'undefined') {
  24     // TODO: load the extension JS
  25   } else {
  26     // TODO: load the hosted JS
  27   }
  28
  29   document.addEventListener('DOMContentLoaded', function() {
  30     var controller = new SkeletonKey(document);
  31   });
  32 })();
  33
  34 /**
  35  * SkeletonKey is view controller for generating secure passwords.
  36  *
  37  * @param {HTMLDocument} doc The document on which to operate.
  38  */
  39 var SkeletonKey = SkeletonKey || function(doc) {
  40   this._master = doc.getElementById('master');
  41   this._sitekey = doc.getElementById('sitekey');
  42   this._username = doc.getElementById('username');
  43   this._password = doc.getElementById('password');
  44   this._generateButton = doc.getElementById('generate');
  45
  46   // If this is an extension, use defaults until the Chrome settings are loaded.
  47   var win = null;
  48   if (!this._isChromeExtension())
  49     win = window;
  50   this._options = new SkeletonKeyOptions(null, win);
  51
  52
  53   this._init();
  54 };
  55
  56 /**
  57  * The number of iterations to perform in PBKDF2.
  58  * @const {int}
  59  */
  60 SkeletonKey.prototype.ITERATIONS = 1000;
  61 /**
  62  * The size of the key, in bytes.
  63  * @const {int}
  64  */
  65 SkeletonKey.prototype.KEYSIZE = 256/32;
  66
  67 /**
  68  * Initializes event handlers for the page.
  69  * @private
  70  */
  71 SkeletonKey.prototype._init = function() {
  72   this._generateButton.onclick = this._onGenerate.bind(this);
  73
  74   this._master.onkeyup = this._nextFieldInterceptor.bind(this);
  75   this._sitekey.onkeyup = this._nextFieldInterceptor.bind(this);
  76   this._username.onkeyup = this._nextFieldInterceptor.bind(this);
  77
  78   this._password.onclick = this._selectPassword.bind(this);
  79   this._password.labels[0].onclick = this._selectPassword.bind(this);
  80
  81   this._initChromeExtension();
  82
  83   this._master.focus();
  84 };
  85
  86 /**
  87  * Event handler for generating a new password.
  88  * @param {Event} e
  89  * @private
  90  */
  91 SkeletonKey.prototype._onGenerate = function(e) {
  92   var salt = this._username.value + '@' + this._sitekey.value;
  93
  94   // |key| is a WordArray of 32-bit words.
  95   var key = CryptoJS.PBKDF2(this._master.value, salt,
  96       {keySize: this.KEYSIZE, iterations: this.ITERATIONS});
  97
  98   var hexString = key.toString();
  99   hexString = this._capitalizeKey(hexString);
 100
 101   var maxLength = this._options.getMaximumPasswordLength();
 102   if (hexString.length > maxLength)
 103     hexString = hexString.substr(0, maxLength);
 104
 105   this._password.value = hexString;
 106   this._selectPassword();
 107 };
 108
 109 /**
 110  * Takes a HEX string and returns a mixed-case string.
 111  * @param {string} key
 112  * @return string
 113  * @private
 114  */
 115 SkeletonKey.prototype._capitalizeKey = function(key) {
 116   // |key| is too long for a decent password, so try and use the second half of
 117   // it as the basis for capitalizing the key.
 118   var capsSource = null;
 119   var keyLength = key.length;
 120   if (keyLength / 2 <= this._options.getMinimumPasswordLength()) {
 121     capsSouce = key.substr(0, keyLength - this._options.getMinimumPasswordLength());
 122   } else {
 123     capsSource = key.substr(keyLength / 2);
 124   }
 125
 126   if (!capsSource || capsSource.length < 1) {
 127     return key;
 128   }
 129
 130   key = key.substr(0, capsSource.length);
 131   var capsSourceLength = capsSource.length;
 132
 133   var j = 0;
 134   var newKey = "";
 135   for (var i = 0; i < key.length; i++) {
 136     var c = key.charCodeAt(i);
 137     // If this is not a lowercase letter or there's no more source, skip.
 138     if (c < 0x61 || c > 0x7A || j >= capsSourceLength) {
 139       newKey += key[i];
 140       continue;
 141     }
 142
 143     var makeCap = capsSource.charCodeAt(j++) % 2;
 144     if (makeCap)
 145       newKey += String.fromCharCode(c - 0x20);
 146     else
 147       newKey += key[i];
 148   }
 149
 150   return newKey;
 151 };
 152
 153 /**
 154  * Checks if the given key event is from the enter key and moves onto the next
 155  * field or generates the password.
 156  * @param {Event} e
 157  * @private
 158  */
 159 SkeletonKey.prototype._nextFieldInterceptor = function(e) {
 160   if (e.keyCode != 0xD)
 161     return;
 162
 163   if (this._master.value == "") {
 164     this._master.focus();
 165   } else if (this._sitekey.value == "") {
 166     this._sitekey.focus();
 167   } else if (this._username.value == "") {
 168     this._username.focus();
 169   } else {
 170     this._generateButton.click();
 171   }
 172 };
 173
 174 /**
 175  * Selects the contents of the generated password.
 176  * @private
 177  */
 178 SkeletonKey.prototype._selectPassword = function() {
 179   this._password.focus();
 180   this._password.select();
 181 };
 182
 183 /**
 184  * Initalizes the Chrome extension pieces if running inside chrome.
 185  * @private
 186  */
 187 SkeletonKey.prototype._initChromeExtension = function() {
 188   return;
 189
 190   // getCurrent is undefined for backround pages. Need content script.
 191   chrome.tabs.getCurrent(function (tab) {
 192     if (tab == null)
 193       return;
 194
 195     var url = tab.url;
 196     if (url == null || url == "")
 197       return;
 198
 199     var siteKey = url.search(/https?:\/\/(www.?|login|accounts?)\.(.*)\.(com?|net|org|edu|biz|info)?.*/);
 200     console.log(siteKey);
 201   });
 202 };
 203
 204 /**
 205  * Checks if SkeletonKey is running as a Chrome extension.
 206  * @returns {bool}
 207  * @private
 208  */
 209 SkeletonKey.prototype._isChromeExtension = function() {
 210   return typeof chrome != 'undefined' && typeof chrome.extension != 'undefined';
 211 };