firefox-main/browser/extensions/webcompat/experiment-apis/aboutConfigPrefs.js (file symbol)

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/* 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";
/* global ExtensionAPI, ExtensionCommon, Services */
this.aboutConfigPrefs = class AboutConfigPrefsChildAPI extends ExtensionAPI {
static ALLOWED_GLOBAL_PREFS = Object.freeze(
[
"layout.css.prefixes.transforms",
"layout.css.webkit-fill-available.enabled",
"media.captureStream.enabled",
"media.webspeech.recognition.enable",
"timer.auto_increase_timer_resolution",
].concat(
Cu.isInAutomation ? ["webcompat.test.pref1", "webcompat.test.pref2"] : []
)
);
getAPI(context) {
const EventManager = ExtensionCommon.EventManager;
const extensionIDBase = context.extension.id.split("@")[0];
const extensionPrefNameBase = `extensions.${extensionIDBase}.`;
function getSafePref(name) {
if (AboutConfigPrefsChildAPI.ALLOWED_GLOBAL_PREFS.includes(name)) {
return name;
}
return `${extensionPrefNameBase}${name}`;
}
return {
aboutConfigPrefs: {
onPrefChange: new EventManager({
context,
name: "aboutConfigPrefs.onUAOverridesPrefChange",
register: (fire, name) => {
const prefName = getSafePref(name);
const callback = (_, __, changedPref) => {
if (changedPref == prefName) {
// ignore if the pref isn't an exact match
fire.async(name).catch(() => {}); // ignore Message Manager disconnects
}
};
Services.prefs.addObserver(prefName, callback);
return () => {
Services.prefs.removeObserver(prefName, callback);
};
},
}).api(),
getCheckableGlobalPrefs() {
return AboutConfigPrefsChildAPI.ALLOWED_GLOBAL_PREFS;
},
getPref(_name, defaultValue) {
const name = getSafePref(_name);
try {
switch (Services.prefs.getPrefType(name)) {
case Ci.nsIPrefBranch.PREF_BOOL:
return Services.prefs.getBoolPref(
name,
defaultValue ?? undefined
);
case Ci.nsIPrefBranch.PREF_INT:
return Services.prefs.getIntPref(
name,
defaultValue ?? undefined
);
case Ci.nsIPrefBranch.PREF_STRING:
return Services.prefs.getStringPref(
name,
defaultValue ?? undefined
);
}
} catch (_) {}
return defaultValue ?? undefined;
},
},
};
}
};