fix(view-once): hold-to-view pattern + content-protection during reveal

2026-05-17 17:15:14 +02:00
parent a7ffcbff83
commit 4ed3f04300
6 changed files with 135 additions and 15 deletions
@@ -0,0 +1,36 @@
+// Window content-protection adapter. Enables / disables OS-level
+// screenshot and screen-recording blocking on the host BrowserWindow.
+//
+//   Windows: WDA_MONITOR (SetWindowDisplayAffinity) — the window surface
+//            appears black in any screen capture tool (OBS, Snipping Tool,
+//            Win+PrtScr, etc.) while protection is enabled.
+//   macOS:   NSWindowSharingNone — equivalent coverage for QuickTime,
+//            Cmd+Shift+3/4, and external recorders.
+//   Linux:   No-op. Electron exposes the API on all platforms but the
+//            X11/Wayland compositors don't honour it in Electron 33.
+//
+// Called by the renderer during view-once image reveals so the image
+// cannot be captured by an OS-level screenshot while it is on screen.
+
+import { BrowserWindow, ipcMain } from 'electron';
+
+import { CHANNELS, type WindowSetContentProtectionArgs } from '../ipc-types';
+
+export function register(mainWindow: BrowserWindow): void {
+  ipcMain.handle(
+    CHANNELS.WINDOW_SET_CONTENT_PROTECTION,
+    (_evt, args: WindowSetContentProtectionArgs) => {
+      // Electron's setContentProtection covers Windows (WDA_MONITOR) and
+      // macOS (NSWindowSharingNone) in one call. No-op on Linux X11.
+      // Wrapped in try/catch because the window can already be destroyed
+      // by the time this fires during a teardown.
+      try {
+        const win = BrowserWindow.fromWebContents(_evt.sender) ?? mainWindow;
+        if (!win || win.isDestroyed()) return;
+        win.setContentProtection(args.enabled);
+      } catch (err) {
+        console.warn('setContentProtection failed', err);
+      }
+    },
+  );
+}