Add device notifications enabled switch (#9324)

src/utils/notifications.ts

@@ -0,0 +1,49 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { LOCAL_NOTIFICATION_SETTINGS_PREFIX } from "matrix-js-sdk/src/@types/event";
+import { MatrixClient } from "matrix-js-sdk/src/client";
+
+import SettingsStore from "../settings/SettingsStore";
+
+export const deviceNotificationSettingsKeys = [
+    "notificationsEnabled",
+    "notificationBodyEnabled",
+    "audioNotificationsEnabled",
+];
+
+export function getLocalNotificationAccountDataEventType(deviceId: string): string {
+    return `${LOCAL_NOTIFICATION_SETTINGS_PREFIX.name}.${deviceId}`;
+}
+
+export async function createLocalNotificationSettingsIfNeeded(cli: MatrixClient): Promise<void> {
+    const eventType = getLocalNotificationAccountDataEventType(cli.deviceId);
+    const event = cli.getAccountData(eventType);
+
+    // New sessions will create an account data event to signify they support
+    // remote toggling of push notifications on this device. Default `is_silenced=true`
+    // For backwards compat purposes, older sessions will need to check settings value
+    // to determine what the state of `is_silenced`
+    if (!event) {
+        // If any of the above is true, we fall in the "backwards compat" case,
+        // and `is_silenced` will be set to `false`
+        const isSilenced = !deviceNotificationSettingsKeys.some(key => SettingsStore.getValue(key));
+
+        await cli.setAccountData(eventType, {
+            is_silenced: isSilenced,
+        });
+    }
+}