Simplifies code.

JitsiConnection.js

@@ -8,8 +8,9 @@ var RandomUtil = require("./modules/util/RandomUtil");
  * @returns {string}
  */
 function generateUserName() {
-    return RandomUtil.random8digitsHex() + "-" + RandomUtil.random4digitsHex() + "-" +
-        RandomUtil.random4digitsHex() + "-" + RandomUtil.random8digitsHex();
+    return RandomUtil.randomHexString(8) + "-" + RandomUtil.randomHexString(4) +
+        "-" + RandomUtil.randomHexString(4) + "-" +
+        RandomUtil.randomHexDigit(8);
 }
 
 /**

modules/util/RandomUtil.js

@@ -1,13 +1,47 @@
+/**
+/**
+ * @const
+ */
+var ALPHANUM = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
 
 /**
- * Generates random hex number within the range [min, max]
- * @param max the maximum value for the generated number
+ * Hexadecimal digits.
+ * @const
+ */
+var HEX_DIGITS = '0123456789abcdef';
+
+/**
+ * Generates random int within the range [min, max]
  * @param min the minimum value for the generated number
- * @returns random hex 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 rangeRandomHex(min, max)
-{
-    return Math.floor(Math.random() * (max - min) + min).toString(16);
+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;
 }
 
 /**
@@ -15,22 +49,22 @@ function rangeRandomHex(min, max)
  */
 var RandomUtil = {
     /**
-     * Generates hex number with length 4
-     */
-    random4digitsHex: function () {
-        return rangeRandomHex(0x1000, 0xFFFF);
-    },
-    /**
-     * Generates hex number with length 8
+     * Returns a random hex digit.
+     * @returns {*}
      */
-    random8digitsHex: function () {
-        return rangeRandomHex(0x10000000, 0xFFFFFFFF);
+    randomHexDigit: function() {
+        return randomElement(HEX_DIGITS);
     },
     /**
-     * Generates hex number with length 12
+     * Returns a random string of hex digits with length 'len'.
+     * @param len the length.
      */
-    random12digitsHex: function () {
-        return rangeRandomHex(0x100000000000, 0xFFFFFFFFFFFF);
+    randomHexString: function (len) {
+        var ret = '';
+        while (len--) {
+            ret += this.randomHexDigit();
+        }
+        return ret;
     }
 };
 

modules/xmpp/LocalSSRCReplacement.js

@@ -132,8 +132,9 @@ var storeLocalVideoSSRC = function (jingleIq) {
  * @returns {string} label/mslabel attribute
  */
 function generateLabel() {
-    return RandomUtil.random8digitsHex() + "-" + RandomUtil.random4digitsHex() + "-" +
-           RandomUtil.random4digitsHex() + "-" + RandomUtil.random4digitsHex() + "-" + RandomUtil.random12digitsHex();
+    return RandomUtil.randomHexString(8) + "-" + RandomUtil.randomHexString(4) +
+        "-" + RandomUtil.randomHexString(4) + "-" +
+        RandomUtil.randomHexString(4) + "-" + RandomUtil.randomHexString(12);
 }
 
 /**