зеркало из https://github.com/mozilla/gecko-dev.git
74 строки
2.5 KiB
JavaScript
74 строки
2.5 KiB
JavaScript
// -*- Mode: javascript; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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"use strict";
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/** This module wraps around navigator.getBattery (https://developer.mozilla.org/en-US/docs/Web/API/Navigator.getBattery).
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* and provides a framework for spoofing battery values in test code.
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* To spoof the battery values, set `Debugging.fake = true` after exporting this with a BackstagePass,
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* after which you can spoof a property yb setting the relevant property of the BatteryManager object.
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*/
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this.EXPORTED_SYMBOLS = ["GetBattery", "Battery"];
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const Ci = Components.interfaces;
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const Cc = Components.classes;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm", this);
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// Load Services, for the BatteryManager API
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XPCOMUtils.defineLazyModuleGetter(this, "Services",
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"resource://gre/modules/Services.jsm");
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// Values for the fake battery. See the documentation of Navigator.battery for the meaning of each field.
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let gFakeBattery = {
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charging: false,
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chargingTime: 0,
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dischargingTime: Infinity,
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level: 1,
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}
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// BackendPass-exported object for toggling spoofing
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this.Debugging = {
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/**
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* If `false`, use the DOM Battery implementation.
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* Set it to `true` if you need to fake battery values
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* for testing or debugging purposes.
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*/
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fake: false
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}
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this.GetBattery = function () {
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return new Services.appShell.hiddenDOMWindow.Promise(function (resolve, reject) {
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// Return fake values if spoofing is enabled, otherwise fetch the real values from the BatteryManager API
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if (Debugging.fake) {
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resolve(gFakeBattery);
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return;
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}
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Services.appShell.hiddenDOMWindow.navigator.getBattery().then(resolve, reject);
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});
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};
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this.Battery = {};
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for (let k of ["charging", "chargingTime", "dischargingTime", "level"]) {
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let prop = k;
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Object.defineProperty(this.Battery, prop, {
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get: function() {
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// Return fake value if spoofing is enabled, otherwise fetch the real value from the BatteryManager API
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if (Debugging.fake) {
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return gFakeBattery[prop];
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}
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return Services.appShell.hiddenDOMWindow.navigator.battery[prop];
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},
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set: function(fakeSetting) {
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if (!Debugging.fake) {
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throw new Error("Tried to set fake battery value when battery spoofing was disabled");
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}
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gFakeBattery[prop] = fakeSetting;
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}
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})
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}
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