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70 lines
2 KiB
JavaScript
70 lines
2 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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export function URLDecorationAnnotationsService() {}
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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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});
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const COLLECTION_NAME = "anti-tracking-url-decoration";
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const PREF_NAME = "privacy.restrict3rdpartystorage.url_decorations";
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URLDecorationAnnotationsService.prototype = {
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classID: Components.ID("{5874af6d-5719-4e1b-b155-ef4eae7fcb32}"),
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QueryInterface: ChromeUtils.generateQI([
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"nsIObserver",
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"nsIURLDecorationAnnotationsService",
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]),
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_initialized: false,
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_prefBranch: null,
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onDataAvailable(entries) {
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// Use this technique in order to ensure the pref cannot be changed by the
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// user e.g. through about:config. This preferences is only intended as a
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// mechanism for reflecting this data to content processes.
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if (this._prefBranch === null) {
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this._prefBranch = Services.prefs.getDefaultBranch("");
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}
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const branch = this._prefBranch;
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branch.unlockPref(PREF_NAME);
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branch.setStringPref(
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PREF_NAME,
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entries.map(x => x.token.replace(/ /, "%20")).join(" ")
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);
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branch.lockPref(PREF_NAME);
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},
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observe(aSubject, aTopic) {
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if (aTopic == "profile-after-change") {
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this.ensureUpdated();
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}
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},
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ensureUpdated() {
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if (this._initialized) {
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return Promise.resolve();
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}
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this._initialized = true;
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const client = lazy.RemoteSettings(COLLECTION_NAME);
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client.on("sync", event => {
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let {
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data: { current },
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} = event;
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this.onDataAvailable(current);
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});
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// Now trigger an update from the server if necessary to get a fresh copy
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// of the data
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return client.get({}).then(entries => {
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this.onDataAvailable(entries);
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return undefined;
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});
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},
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};
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