Source: lib/polyfill/storage_estimate.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  7. goog.provide('shaka.polyfill.StorageEstimate');
  9. goog.require('shaka.polyfill');
  12. /**
  13.  * @summary A polyfill to provide navigator.storage.estimate in old
  14.  * webkit browsers.
  15.  * See: https://developers.google.com/web/updates/2017/08/estimating-available-storage-space#the-present
  16.  * @export
  17.  */
  18. shaka.polyfill.StorageEstimate = class {
  19.   /**
  20.    * Install the polyfill if needed.
  21.    * @export
  22.    */
  23.   static install() {
  24.     if (navigator.storage && navigator.storage.estimate) {
  25.       // No need.
  26.       return;
  27.     }
  29.     if (navigator.webkitTemporaryStorage &&
  30.         navigator.webkitTemporaryStorage.queryUsageAndQuota) {
  31.       if (!('storage' in navigator)) {
  32.         navigator.storage = /** @type {!StorageManager} */ ({});
  33.       }
  34.       navigator.storage.estimate =
  35.           shaka.polyfill.StorageEstimate.storageEstimate_;
  36.     }
  37.   }
  39.   /**
  40.    * @this {StorageManager}
  41.    * @return {!Promise}
  42.    * @private
  43.    */
  44.   static storageEstimate_() {
  45.     return new Promise((resolve, reject) => {
  46.       navigator.webkitTemporaryStorage.queryUsageAndQuota(
  47.           (usage, quota) => {
  48.             resolve({usage: usage, quota: quota});
  49.           },
  50.           reject,
  51.       );
  52.     });
  53.   }
  54. };
  57. shaka.polyfill.register(shaka.polyfill.StorageEstimate.install);