Bloquer les captures ou enregistrements d'écran

Riot/Modules/Application/AppDelegate.swift

@@ -59,6 +59,11 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         let window = UIWindow(frame: UIScreen.main.bounds)
         self.window = window
 
+        // Tchap: secure window to prevent screenshot and screen recording (only in PRODUCTION environment)
+        #if TCHAP_PRODUCTION
+        window.makeSecure()
+        #endif
+
         // Create AppCoordinator
         self.rootRouter = RootRouter(window: window)
 

Tchap/Extensions/UIWindow+Tchap.swift

@@ -0,0 +1,54 @@
+// 
+// Copyright 2024 New Vector Ltd
+//
+// 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 UIKit
+
+extension UIWindow {
+
+    // Screen recording can be prevented on iOS by listening to `UIScreen.capturedDidChangeNotification` and masking the screen content.
+    //
+    // But screenshot cannot be prevented.
+    // We can be informed the user made a screenshot by listening to `UIApplication.userDidTakeScreenshotNotification`,
+    // but we are informed after the screenshot took place and cannot mask any screen content because it's too late.
+    //
+    // But iOS auto mask content of Secured UITextField when capturing or recording screen.
+    //
+    // The hack is too embed any view (such as root window) in a Secured UITextField and iOS will mask it on screen capture or recording.
+    //
+    // Any screen capture or recording will end in a blank picture or movie in the Photos gallery.
+
+    // from: https://stackoverflow.com/a/77922186/399439
+
+    func makeSecure() {
+        let field = UITextField()
+
+        let view = UIView(frame: CGRect(x: 0, y: 0, width: field.frame.self.width, height: field.frame.self.height))
+
+        let image = UIImageView(image: UIImage())
+        image.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
+
+        field.isSecureTextEntry = true
+
+        self.addSubview(field)
+        view.addSubview(image)
+
+        self.layer.superlayer?.addSublayer(field.layer)
+        field.layer.sublayers?.last!.addSublayer(self.layer)
+
+        field.leftView = view
+        field.leftViewMode = .always
+    }
+}

changelog.d/797.change

@@ -0,0 +1 @@
+Bloquer les captures ou enregistrements d'écran