Add `Notifications.getStatus`

preload.js

@@ -200,6 +200,7 @@ window.Signal.Migrations.Migrations0DatabaseWithAttachmentData = require('./js/m
 window.Signal.Migrations.Migrations1DatabaseWithoutAttachmentData = require('./js/modules/migrations/migrations_1_database_without_attachment_data');
 
 window.Signal.Migrations.upgradeMessageSchema = upgradeMessageSchema;
+window.Signal.Notifications = require('./ts/notifications');
 window.Signal.OS = require('./js/modules/os');
 window.Signal.Settings = require('./js/modules/settings');
 window.Signal.Startup = require('./js/modules/startup');

ts/notifications/getStatus.ts

@@ -0,0 +1,60 @@
+interface Environment {
+  isAppFocused: boolean;
+  isAudioNotificationEnabled: boolean;
+  isAudioNotificationSupported: boolean;
+  isEnabled: boolean;
+  numNotifications: number;
+  userSetting: UserSetting;
+}
+
+interface Status {
+  shouldClearNotifications: boolean;
+  shouldPlayNotificationSound: boolean;
+  shouldShowNotifications: boolean;
+  type: Type;
+}
+
+type UserSetting = 'off' | 'count' | 'name' | 'message';
+
+type Type =
+  | 'ok'
+  | 'disabled'
+  | 'appIsFocused'
+  | 'noNotifications'
+  | 'userSetting';
+
+export const getStatus = (environment: Environment): Status => {
+  const type = ((): Type => {
+    if (!environment.isEnabled) {
+      return 'disabled';
+    }
+
+    const hasNotifications = environment.numNotifications > 0;
+    if (!hasNotifications) {
+      return 'noNotifications';
+    }
+
+    if (environment.isAppFocused) {
+      return 'appIsFocused';
+    }
+
+    if (environment.userSetting === 'off') {
+      return 'userSetting';
+    }
+
+    return 'ok';
+  })();
+
+  const shouldPlayNotificationSound =
+    environment.isAudioNotificationSupported &&
+    environment.isAudioNotificationEnabled;
+  const shouldShowNotifications = type === 'ok';
+  const shouldClearNotifications = type === 'appIsFocused';
+
+  return {
+    shouldClearNotifications,
+    shouldPlayNotificationSound,
+    shouldShowNotifications,
+    type,
+  };
+};

ts/notifications/index.ts

@@ -0,0 +1,3 @@
+import { getStatus } from './getStatus';
+
+export { getStatus };