Dactyloidae iOS initial commit

mobile/ios/Client/Frontend/AuthenticationManager/SensitiveViewController.swift

@@ -0,0 +1,115 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import SnapKit
+import SwiftKeychainWrapper
+
+enum AuthenticationState {
+    case notAuthenticating
+    case presenting
+}
+
+class SensitiveViewController: UIViewController {
+    var promptingForTouchID: Bool = false
+    var backgroundedBlur: UIImageView?
+    var authState: AuthenticationState = .notAuthenticating
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        let notificationCenter = NotificationCenter.default
+        notificationCenter.addObserver(self, selector: #selector(SensitiveViewController.checkIfUserRequiresValidation), name: NSNotification.Name.UIApplicationWillEnterForeground, object: nil)
+        notificationCenter.addObserver(self, selector: #selector(SensitiveViewController.checkIfUserRequiresValidation), name: NSNotification.Name.UIApplicationDidBecomeActive, object: nil)
+        notificationCenter.addObserver(self, selector: #selector(SensitiveViewController.blurContents), name: NSNotification.Name.UIApplicationWillResignActive, object: nil)
+        notificationCenter.addObserver(self, selector: #selector(SensitiveViewController.hideLogins), name: NSNotification.Name.UIApplicationDidEnterBackground, object: nil)
+
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        let notificationCenter = NotificationCenter.default
+        notificationCenter.removeObserver(self, name: NSNotification.Name.UIApplicationWillEnterForeground, object: nil)
+        notificationCenter.removeObserver(self, name: NSNotification.Name.UIApplicationWillResignActive, object: nil)
+        notificationCenter.removeObserver(self, name: NSNotification.Name.UIApplicationDidBecomeActive, object: nil)
+        notificationCenter.removeObserver(self, name: NSNotification.Name.UIApplicationDidEnterBackground, object: nil)
+    }
+
+    func checkIfUserRequiresValidation() {
+        guard authState != .presenting else {
+            return
+        }
+
+        presentedViewController?.dismiss(animated: false, completion: nil)
+        guard let authInfo = KeychainWrapper.sharedAppContainerKeychain.authenticationInfo(), authInfo.requiresValidation() else {
+            removeBackgroundedBlur()
+            return
+        }
+
+        promptingForTouchID = true
+        AppAuthenticator.presentAuthenticationUsingInfo(authInfo,
+            touchIDReason: AuthenticationStrings.loginsTouchReason,
+            success: {
+                self.promptingForTouchID = false
+                self.authState = .notAuthenticating
+                self.removeBackgroundedBlur()
+            },
+            cancel: {
+                self.promptingForTouchID = false
+                self.authState = .notAuthenticating
+                _ = self.navigationController?.popToRootViewController(animated: true)
+            },
+            fallback: {
+                self.promptingForTouchID = false
+                AppAuthenticator.presentPasscodeAuthentication(self.navigationController, delegate: self)
+            }
+        )
+        authState = .presenting
+    }
+
+    func hideLogins() {
+        _ = self.navigationController?.popToRootViewController(animated: true)
+    }
+
+    func blurContents() {
+        if backgroundedBlur == nil {
+            backgroundedBlur = addBlurredContent()
+        }
+    }
+
+    func removeBackgroundedBlur() {
+        if !promptingForTouchID {
+            backgroundedBlur?.removeFromSuperview()
+            backgroundedBlur = nil
+        }
+    }
+
+    fileprivate func addBlurredContent() -> UIImageView? {
+        guard let snapshot = view.screenshot() else {
+            return nil
+        }
+
+        let blurredSnapshot = snapshot.applyBlur(withRadius: 10, blurType: BOXFILTER, tintColor: UIColor(white: 1, alpha: 0.3), saturationDeltaFactor: 1.8, maskImage: nil)
+        let blurView = UIImageView(image: blurredSnapshot)
+        view.addSubview(blurView)
+        blurView.snp.makeConstraints { $0.edges.equalTo(self.view) }
+        view.layoutIfNeeded()
+
+        return blurView
+    }
+}
+
+// MARK: - PasscodeEntryDelegate
+extension SensitiveViewController: PasscodeEntryDelegate {
+    func passcodeValidationDidSucceed() {
+        removeBackgroundedBlur()
+        self.navigationController?.dismiss(animated: true, completion: nil)
+        self.authState = .notAuthenticating
+    }
+
+    func userDidCancelValidation() {
+        _ = self.navigationController?.popToRootViewController(animated: false)
+        self.authState = .notAuthenticating
+    }
+}
+