Initial setup ready for PIN/Biometric app lock. (#1876)

* Add AppLockCoordinator and WindowManager.
2026-11-04 01:20:12 +00:00 · 2023-10-11 13:59:47 +01:00
parent b35bee5d8f
commit b6470c9651
32 changed files with 838 additions and 15 deletions
@@ -0,0 +1,87 @@
+//
+// Copyright 2023 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 Combine
+import SwiftUI
+
+enum AppLockFlowCoordinatorAction: Equatable {
+    /// Display the unlock flow.
+    case lockApp
+    /// Hide the unlock flow.
+    case unlockApp
+}
+
+/// Coordinates the display of any screens shown when the app is locked.
+class AppLockFlowCoordinator: CoordinatorProtocol {
+    let appLockService: AppLockServiceProtocol
+    let navigationCoordinator: NavigationRootCoordinator
+    
+    private var cancellables: Set<AnyCancellable> = []
+    
+    private let actionsSubject: PassthroughSubject<AppLockFlowCoordinatorAction, Never> = .init()
+    var actions: AnyPublisher<AppLockFlowCoordinatorAction, Never> {
+        actionsSubject.eraseToAnyPublisher()
+    }
+    
+    init(appLockService: AppLockServiceProtocol, navigationCoordinator: NavigationRootCoordinator) {
+        self.appLockService = appLockService
+        self.navigationCoordinator = navigationCoordinator
+        
+        NotificationCenter.default.publisher(for: UIApplication.didEnterBackgroundNotification)
+            .sink { [weak self] _ in
+                self?.showPlaceholderIfNeeded()
+            }
+            .store(in: &cancellables)
+        
+        NotificationCenter.default.publisher(for: UIApplication.willEnterForegroundNotification)
+            .sink { [weak self] _ in
+                self?.showUnlockScreenIfNeeded()
+            }
+            .store(in: &cancellables)
+    }
+    
+    func toPresentable() -> AnyView {
+        AnyView(navigationCoordinator.toPresentable())
+    }
+    
+    // MARK: - App unlock
+    
+    /// Displays the unlock flow with the app's placeholder view to hide obscure the view hierarchy in the app switcher.
+    private func showPlaceholderIfNeeded() {
+        guard appLockService.isEnabled else { return }
+        
+        navigationCoordinator.setRootCoordinator(PlaceholderScreenCoordinator(), animated: false)
+        actionsSubject.send(.lockApp)
+    }
+    
+    /// Displays the unlock flow with the main unlock screen.
+    private func showUnlockScreenIfNeeded() {
+        guard appLockService.isEnabled, appLockService.needsUnlock else { return }
+        
+        let coordinator = AppLockScreenCoordinator(parameters: .init(appLockService: appLockService))
+        coordinator.actions.sink { [weak self] action in
+            guard let self else { return }
+            switch action {
+            case .appUnlocked:
+                actionsSubject.send(.unlockApp)
+            }
+        }
+        .store(in: &cancellables)
+        
+        navigationCoordinator.setRootCoordinator(coordinator, animated: false)
+        actionsSubject.send(.lockApp)
+    }
+}