Windows: Prevent Notifications from Showing on Lock Screen

This update ensures that notifications are not displayed when the system is locked on Windows. Using Electron's powerMonitor, the app detects when the screen is locked and blocks notifications to prevent potential leaks of sensitive information.

app/main/index.ts

@@ -185,6 +185,7 @@ function createMainWindow(): BrowserWindow {
       mainWindow.show();
     }
     // Handle deep link when opened from protocol
+
     const url = commandLine.find((argument) => argument.startsWith("zulip://"));
     if (url) {
       mainWindow.webContents.send("open-url", url);

app/renderer/js/electron-bridge.ts

@@ -17,7 +17,7 @@ export type ElectronBridge = {
     title: string,
     options: NotificationOptions,
     dispatch: (type: string, eventInit: EventInit) => boolean,
-  ) => NotificationData;
+  ) => NotificationData | null;
   get_idle_on_system: () => boolean;
   get_last_active_on_system: () => number;
   get_send_notification_reply_message_supported: () => boolean;
@@ -47,7 +47,7 @@ const electron_bridge: ElectronBridge = {
     title: string,
     options: NotificationOptions,
     dispatch: (type: string, eventInit: EventInit) => boolean,
-  ): NotificationData => newNotification(title, options, dispatch),
+  ): NotificationData | null => newNotification(title, options, dispatch),
 
   get_idle_on_system: (): boolean => idle,
 

app/renderer/js/notification/index.ts

@@ -1,5 +1,16 @@
+import {powerMonitor} from "electron/main";
+
 import {ipcRenderer} from "../typed-ipc-renderer.js";
 
+let isLocked = false;
+
+powerMonitor.on("lock-screen", () => {
+  isLocked = true;
+});
+powerMonitor.on("unlock-screen", () => {
+  isLocked = false;
+});
+
 export type NotificationData = {
   close: () => void;
   title: string;
@@ -15,7 +26,12 @@ export function newNotification(
   title: string,
   options: NotificationOptions,
   dispatch: (type: string, eventInit: EventInit) => boolean,
-): NotificationData {
+): NotificationData | null {
+  if (isLocked) {
+    console.log("Notification blocked: Screen is locked.");
+    return null; // Prevent showing notification when the screen is locked
+  }
+
   const notification = new Notification(title, {...options, silent: true});
   for (const type of ["click", "close", "error", "show"]) {
     notification.addEventListener(type, (event) => {