forked from mirrors/gecko-dev
93 lines
2.7 KiB
JavaScript
93 lines
2.7 KiB
JavaScript
/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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const lazy = {};
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ChromeUtils.defineESModuleGetters(lazy, {
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RemoteSettings: "resource://services-settings/remote-settings.sys.mjs",
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RemoteSettingsClient:
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"resource://services-settings/RemoteSettingsClient.sys.mjs",
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});
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const SETTINGS_IGNORELIST_KEY = "hijack-blocklists";
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class IgnoreListsManager {
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async init() {
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if (!this._ignoreListSettings) {
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this._ignoreListSettings = lazy.RemoteSettings(SETTINGS_IGNORELIST_KEY);
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}
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}
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async getAndSubscribe(listener) {
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await this.init();
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// Trigger a get of the initial value.
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const settings = await this._getIgnoreList();
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// Listen for future updates after we first get the values.
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this._ignoreListSettings.on("sync", listener);
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return settings;
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}
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unsubscribe(listener) {
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if (!this._ignoreListSettings) {
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return;
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}
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this._ignoreListSettings.off("sync", listener);
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}
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async _getIgnoreList() {
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if (this._getSettingsPromise) {
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return this._getSettingsPromise;
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}
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const settings = await (this._getSettingsPromise =
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this._getIgnoreListSettings());
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delete this._getSettingsPromise;
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return settings;
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}
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/**
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* Obtains the current ignore list from remote settings. This includes
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* verifying the signature of the ignore list within the database.
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*
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* If the signature in the database is invalid, the database will be wiped
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* and the stored dump will be used, until the settings next update.
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*
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* Note that this may cause a network check of the certificate, but that
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* should generally be quick.
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*
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* @param {boolean} [firstTime]
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* Internal boolean to indicate if this is the first time check or not.
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* @returns {array}
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* An array of objects in the database, or an empty array if none
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* could be obtained.
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*/
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async _getIgnoreListSettings(firstTime = true) {
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let result = [];
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try {
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result = await this._ignoreListSettings.get({
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verifySignature: true,
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});
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} catch (ex) {
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if (
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ex instanceof lazy.RemoteSettingsClient.InvalidSignatureError &&
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firstTime
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) {
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// The local database is invalid, try and reset it.
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await this._ignoreListSettings.db.clear();
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// Now call this again.
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return this._getIgnoreListSettings(false);
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}
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// Don't throw an error just log it, just continue with no data, and hopefully
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// a sync will fix things later on.
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console.error(ex);
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}
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return result;
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}
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}
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export const IgnoreLists = new IgnoreListsManager();
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