move username generator to utils

modules/settings/Settings.js

-var UsernameGenerator = require('../statistics/UsernameGenerator');
+var UsernameGenerator = require('../util/UsernameGenerator');
 
 var email = '';
 var displayName = '';
     }
     if (!window.localStorage.callStatsUID) {
         window.localStorage.callStatsUID = UsernameGenerator.generateUsername();
-        console.log('generated callstats uid', window.localStorage.callStatsUID);
+        console.log('generated callstats uid',
+            window.localStorage.callStatsUID);
     }
     userId = window.localStorage.jitsiMeetId || '';
     callStatsUID = window.localStorage.callStatsUID;

modules/util/RandomUtil.js

+/**
+ * @const
+ */
+var ALPHANUM = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
 
 /**
- * Generates random hex number within the range [min, max]
+ * Generates random int within the range [min, max]
+ * @param min the minimum value for the generated number
  * @param max the maximum value for the generated number
+ * @returns random int number
+ */
+function randomInt(min, max) {
+    return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+/**
+ * Get random element from array or string.
+ * @param {Array|string} arr source
+ * @returns array element or string character
+ */
+function randomElement(arr) {
+    return arr[randomInt(0, arr.length -1)];
+}
+
+/**
+ * Generate random alphanumeric string.
+ * @param {number} length expected string length
+ * @returns {string} random string of specified length
+ */
+function randomAlphanumStr(length) {
+    var result = '';
+
+    for (var i = 0; i < length; i += 1) {
+        result += randomElement(ALPHANUM);
+    }
+
+    return result;
+}
+
+/**
+ * Generates random hex number within the range [min, max]
  * @param min the minimum value for the generated number
+ * @param max the maximum value for the generated number
  * @returns random hex number
  */
 function rangeRandomHex(min, max)
 {
-    return Math.floor(Math.random() * (max - min) + min).toString(16);
+    return randomInt(min, max).toString(16);
 }
 
 /**

modules/statistics/UsernameGenerator.js → modules/util/UsernameGenerator.js

+var RandomUtil = require('./RandomUtil');
+
 /**
- * from faker.js - Copyright (c) 2014-2015 Matthew Bergman & Marak Squires, MIT License
+ * from faker.js - Copyright (c) 2014-2015 Matthew Bergman & Marak Squires
+ * MIT License
  * http://github.com/marak/faker.js/
  *
  * @const
   "Zora", "Zula"
 ];
 
-/**
- * @const
- */
-var suffixChars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
-
-
-/**
- * Returns a random integer between min (inclusive) and max (inclusive).
- */
-function getRandomInt(min, max) {
-  return Math.floor(Math.random() * (max - min + 1)) + min;
-}
-
-
-/**
- * Get random element from array or string.
- *
- * @param {Array|string} arr source
- *
- * @returns array element or string character
- */
-function getRandomElement(arr) {
-  return arr[getRandomInt(0, arr.length -1)];
-}
-
-/**
- * Generate random alphanumeric string.
- *
- * @param {number} length expected string length
- *
- * @returns {string} random string of specified length
- */
-function generateAlphanumStr(length) {
-  var result = '';
-
-  for (var i = 0; i < length; i += 1) {
-    result += getRandomElement(suffixChars);
-  }
-
-  return result;
-}
-
 /**
  * Generate random username.
  * @returns {string} random username
  */
 function generateUsername () {
-  var name = getRandomElement(names);
-  var suffix = generateAlphanumStr(3);
+  var name = RandomUtil.randomElement(names);
+  var suffix = RandomUtil.randomAlphanumStr(3);
 
   return name + '-' +  suffix;
 }