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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
//
// Copyright (C) 2018, 2019, 2020 Endless Mobile, Inc.
//
// This is a GNOME Shell component to wrap the interactions over
// D-Bus with the malcontent library.
//
// Licensed under the GNU General Public License Version 2
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
/* exported getDefault */
const { Gio, GObject, Shell } = imports.gi;
// We require libmalcontent ≥ 0.6.0
const HAVE_MALCONTENT = imports.package.checkSymbol(
'Malcontent', '0', 'ManagerGetValueFlags');
var Malcontent = null;
if (HAVE_MALCONTENT) {
Malcontent = imports.gi.Malcontent;
Gio._promisify(Malcontent.Manager.prototype, 'get_app_filter_async');
}
let _singleton = null;
function getDefault() {
if (_singleton === null)
_singleton = new ParentalControlsManager();
return _singleton;
}
// A manager class which provides cached access to the constructing user’s
// parental controls settings. It’s possible for the user’s parental controls
// to change at runtime if the Parental Controls application is used by an
// administrator from within the user’s session.
var ParentalControlsManager = GObject.registerClass({
Signals: {
'app-filter-changed': {},
},
}, class ParentalControlsManager extends GObject.Object {
_init() {
super._init();
this._initialized = false;
this._disabled = false;
this._appFilter = null;
this._initializeManager();
}
async _initializeManager() {
if (!HAVE_MALCONTENT) {
console.debug('Skipping parental controls support, malcontent not found');
this._initialized = true;
this.emit('app-filter-changed');
return;
}
try {
const connection = await Gio.DBus.get(Gio.BusType.SYSTEM, null);
this._manager = new Malcontent.Manager({ connection });
this._appFilter = await this._getAppFilter();
} catch (e) {
logError(e, 'Failed to get parental controls settings');
return;
}
this._manager.connect('app-filter-changed', this._onAppFilterChanged.bind(this));
// Signal initialisation is complete.
this._initialized = true;
this.emit('app-filter-changed');
}
async _getAppFilter() {
let appFilter = null;
try {
appFilter = await this._manager.get_app_filter_async(
Shell.util_get_uid(),
Malcontent.ManagerGetValueFlags.NONE,
null);
} catch (e) {
if (!e.matches(Malcontent.ManagerError, Malcontent.ManagerError.DISABLED))
throw e;
console.debug('Parental controls globally disabled');
this._disabled = true;
}
return appFilter;
}
async _onAppFilterChanged(manager, uid) {
// Emit 'changed' signal only if app-filter is changed for currently logged-in user.
let currentUid = Shell.util_get_uid();
if (currentUid !== uid)
return;
try {
this._appFilter = await this._getAppFilter();
this.emit('app-filter-changed');
} catch (e) {
// Log an error and keep the old app filter.
logError(e, `Failed to get new MctAppFilter for uid ${Shell.util_get_uid()} on app-filter-changed`);
}
}
get initialized() {
return this._initialized;
}
// Calculate whether the given app (a Gio.DesktopAppInfo) should be shown
// on the desktop, in search results, etc. The app should be shown if:
// - The .desktop file doesn’t say it should be hidden.
// - The executable from the .desktop file’s Exec line isn’t denied in
// the user’s parental controls.
// - None of the flatpak app IDs from the X-Flatpak and the
// X-Flatpak-RenamedFrom lines are denied in the user’s parental
// controls.
shouldShowApp(appInfo) {
// Quick decision?
if (!appInfo.should_show())
return false;
// Are parental controls enabled (at configure time or runtime)?
if (!HAVE_MALCONTENT || this._disabled)
return true;
// Have we finished initialising yet?
if (!this.initialized) {
console.debug(`Hiding app because parental controls not yet initialised: ${appInfo.get_id()}`);
return false;
}
return this._appFilter.is_appinfo_allowed(appInfo);
}
});
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