updates (prebid#3162)

devunrulymedia · Jan 30, 2019 · 831b2e6 · 831b2e6
1 parent 974bb09
commit 831b2e6
Showing 1 changed file with 13 additions and 1 deletion.
diff --git a/src/utils.js b/src/utils.js
@@ -66,10 +66,22 @@ exports.getUniqueIdentifierStr = _getUniqueIdentifierStr;
  */
 exports.generateUUID = function generateUUID(placeholder) {
   return placeholder
-    ? (placeholder ^ Math.random() * 16 >> placeholder / 4).toString(16)
+    ? (placeholder ^ _getRandomData() >> placeholder / 4).toString(16)
     : ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, generateUUID);
 };
 
+/**
+ * Returns random data using the Crypto API if available and Math.random if not
+ * Method is from https://gist.github.com/jed/982883 like generateUUID, direct link https://gist.github.com/jed/982883#gistcomment-45104
+ */
+function _getRandomData() {
+  if (window && window.crypto && window.crypto.getRandomValues) {
+    return crypto.getRandomValues(new Uint8Array(1))[0] % 16;
+  } else {
+    return Math.random() * 16;
+  }
+}
+
 exports.getBidIdParameter = function (key, paramsObj) {
   if (paramsObj && paramsObj[key]) {
     return paramsObj[key];