MessageTray: introduce configurable per-source notification policy

Allow message tray sources to provide a NotificationPolicy object,
that will configure how and if the source is displayed. For notification
daemon sources, this object is hooked to GSettings.

https://bugzilla.gnome.org/show_bug.cgi?id=685926

js/ui/notificationDaemon.js

@@ -103,6 +103,126 @@ const STANDARD_TRAY_ICON_IMPLEMENTATIONS = {
     'ibus-ui-gtk': 'keyboard'
 };
 
+const NotificationGenericPolicy = new Lang.Class({
+    Name: 'NotificationGenericPolicy',
+    Extends: MessageTray.NotificationPolicy,
+
+    _init: function() {
+        // Don't chain to parent, it would try setting
+        // our properties to the defaults
+
+        this.id = 'generic';
+
+        this._masterSettings = new Gio.Settings({ schema: 'org.gnome.desktop.notifications' });
+        this._masterSettings.connect('changed', Lang.bind(this, this._changed));
+    },
+
+    store: function() { },
+
+    destroy: function() {
+        this._masterSettings.run_dispose();
+    },
+
+    _changed: function(settings, key) {
+        this.emit('policy-changed', key);
+    },
+
+    get enable() {
+        return true;
+    },
+
+    get enableSound() {
+        return true;
+    },
+
+    get showBanners() {
+        return this._masterSettings.get_boolean('show-banners');
+    },
+
+    get forceExpanded() {
+        return false;
+    },
+
+    get showInLockScreen() {
+        return this._masterSettings.get_boolean('show-in-lock-screen');
+    },
+
+    get detailsInLockScreen() {
+        return false;
+    }
+});
+
+const NotificationApplicationPolicy = new Lang.Class({
+    Name: 'NotificationApplicationPolicy',
+    Extends: MessageTray.NotificationPolicy,
+
+    _init: function(id) {
+        // Don't chain to parent, it would try setting
+        // our properties to the defaults
+
+        this.id = id;
+        this._canonicalId = this._canonicalizeId(id)
+
+        this._masterSettings = new Gio.Settings({ schema: 'org.gnome.desktop.notifications' });
+        this._settings = new Gio.Settings({ schema: 'org.gnome.desktop.notifications.application',
+                                            path: '/org/gnome/desktop/notifications/application/' + this._canonicalId + '/' });
+
+        this._masterSettings.connect('changed', Lang.bind(this, this._changed));
+        this._settings.connect('changed', Lang.bind(this, this._changed));
+    },
+
+    store: function() {
+        this._settings.set_string('application-id', this.id + '.desktop');
+
+        let apps = this._masterSettings.get_strv('application-children');
+        if (apps.indexOf(this._canonicalId) < 0) {
+            apps.push(this._canonicalId);
+            this._masterSettings.set_strv('application-children', apps);
+        }
+    },
+
+    destroy: function() {
+        this._masterSettings.run_dispose();
+        this._settings.run_dispose();
+    },
+
+    _changed: function(settings, key) {
+        this.emit('policy-changed', key);
+    },
+
+    _canonicalizeId: function(id) {
+        // Keys are restricted to lowercase alphanumeric characters and dash,
+        // and two dashes cannot be in succession
+        return id.toLowerCase().replace(/[^a-z0-9\-]/g, '-').replace(/--+/g, '-');
+    },
+
+    get enable() {
+        return this._settings.get_boolean('enable');
+    },
+
+    get enableSound() {
+        return this._settings.get_boolean('enable-sound-alerts');
+    },
+
+    get showBanners() {
+        return this._masterSettings.get_boolean('show-banners') &&
+            this._settings.get_boolean('show-banners');
+    },
+
+    get forceExpanded() {
+        return this._settings.get_boolean('force-expanded');
+    },
+
+    get showInLockScreen() {
+        return this._masterSettings.get_boolean('show-in-lock-screen') &&
+            this._settings.get_boolean('show-in-lock-screen');
+    },
+
+    get detailsInLockScreen() {
+        return this._settings.get_boolean('details-in-lock-screen');
+    }
+});
+
 const NotificationDaemon = new Lang.Class({
     Name: 'NotificationDaemon',
 
@@ -546,6 +666,15 @@ const Source = new Lang.Class({
         }
     },
 
+    _createPolicy: function() {
+        if (this.app) {
+            let id = this.app.get_id().replace(/\.desktop$/,'');
+            return new NotificationApplicationPolicy(id);
+        } else {
+            return new NotificationGenericPolicy();
+        }
+    },
+
     _onNameVanished: function() {
         // Destroy the notification source when its sender is removed from DBus.
         // Only do so if this.app is set to avoid removing "notify-send" sources, senders