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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/. */
ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
ChromeUtils.import("resource://gre/modules/Services.jsm");
const PREF_BRANCH = "extensions.webcompat.";
const PREF_DEFAULTS = {perform_ua_overrides: true};
const UA_OVERRIDES_INIT_TOPIC = "useragentoverrides-initialized";
const UA_ENABLE_PREF_NAME = "extensions.webcompat.perform_ua_overrides";
ChromeUtils.defineModuleGetter(this, "UAOverrider", "chrome://webcompat/content/lib/ua_overrider.jsm");
ChromeUtils.defineModuleGetter(this, "UAOverrides", "chrome://webcompat/content/data/ua_overrides.jsm");
let overrider;
function UAEnablePrefObserver() {
let isEnabled = Services.prefs.getBoolPref(UA_ENABLE_PREF_NAME);
if (isEnabled && !overrider) {
overrider = new UAOverrider(UAOverrides);
overrider.init();
} else if (!isEnabled && overrider) {
overrider = null;
}
}
function setDefaultPrefs() {
const branch = Services.prefs.getDefaultBranch(PREF_BRANCH);
for (const [key, val] of Object.entries(PREF_DEFAULTS)) {
// If someone beat us to setting a default, don't overwrite it.
if (branch.getPrefType(key) !== branch.PREF_INVALID) {
continue;
}
switch (typeof val) {
case "boolean":
branch.setBoolPref(key, val);
break;
case "number":
branch.setIntPref(key, val);
break;
case "string":
branch.setCharPref(key, val);
break;
}
}
}
this.install = function() {};
this.uninstall = function() {};
this.startup = function({webExtension}) {
setDefaultPrefs();
// Intentionally reset the preference on every browser restart to avoid site
// breakage by accidentally toggled preferences or by leaving it off after
// debugging a site.
Services.prefs.clearUserPref(UA_ENABLE_PREF_NAME);
Services.prefs.addObserver(UA_ENABLE_PREF_NAME, UAEnablePrefObserver);
// Listen to the useragentoverrides-initialized notification we get and
// initialize our overrider there. This is done to avoid slowing down the
// apparent startup proces, since we avoid loading anything before the first
// window is visible to the user. See bug 1371442 for details.
let startupWatcher = {
observe(aSubject, aTopic, aData) {
if (aTopic !== UA_OVERRIDES_INIT_TOPIC) {
return;
}
Services.obs.removeObserver(this, UA_OVERRIDES_INIT_TOPIC);
overrider = new UAOverrider(UAOverrides);
overrider.init();
}
};
Services.obs.addObserver(startupWatcher, UA_OVERRIDES_INIT_TOPIC);
};
this.shutdown = function() {
Services.prefs.removeObserver(UA_ENABLE_PREF_NAME, UAEnablePrefObserver);
};
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