Source: lib/polyfill/random_uuid.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  6. goog.provide('shaka.polyfill.RandomUUID');
  8. goog.require('shaka.log');
  9. goog.require('shaka.polyfill');
  11. /**
  12.  * @summary A polyfill to provide window.crypto.randomUUID in all browsers.
  13.  * @export
  14.  */
  15. shaka.polyfill.RandomUUID = class {
  16.   /**
  17.    * Install the polyfill if needed.
  18.    * @export
  19.    */
  20.   static install() {
  21.     shaka.log.debug('randomUUID.install');
  23.     if (!window.crypto) {
  24.       // See: https://caniuse.com/cryptography
  25.       shaka.log.debug(
  26.           'window.crypto must be available to install randomUUID polyfill.');
  27.       return;
  28.     }
  30.     if ('randomUUID' in window.crypto) {
  31.       shaka.log.debug(
  32.           'RandomUUID: Native window.crypto.randomUUID() support found.');
  33.       return;
  34.     }
  36.     window.crypto.randomUUID = shaka.polyfill.RandomUUID.randomUUID_;
  37.   }
  39.   /**
  40.    * @return {string}
  41.    * @private
  42.    */
  43.   static randomUUID_() {
  44.     const url = URL.createObjectURL(new Blob());
  45.     const uuid = url.toString();
  46.     URL.revokeObjectURL(url);
  47.     return uuid.substr(uuid.lastIndexOf('/') + 1);
  48.   }
  49. };
  52. shaka.polyfill.register(shaka.polyfill.RandomUUID.install);