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