Secrets setup: Handle set up recovery key screen.

Riot/Modules/Secrets/Setup/RecoveryKey/SecretsSetupRecoveryKeyViewController.swift

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+// File created from ScreenTemplate
+// $ createScreen.sh SecretsSetupRecoveryKey SecretsSetupRecoveryKey
+/*
+ Copyright 2020 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
+
+final class SecretsSetupRecoveryKeyViewController: UIViewController {
+    
+    // MARK: - Properties
+    
+    // MARK: Outlets
+    
+    @IBOutlet private weak var secureKeyImageView: UIImageView!
+    @IBOutlet private weak var informationLabel: UILabel!
+    @IBOutlet private weak var recoveryKeyLabel: UILabel!
+    @IBOutlet private weak var exportButton: RoundedButton!
+    @IBOutlet private weak var doneButton: RoundedButton!
+    
+    // MARK: Private
+
+    private var viewModel: SecretsSetupRecoveryKeyViewModelType!
+    private var theme: Theme!
+    private var errorPresenter: MXKErrorPresentation!
+    private var activityPresenter: ActivityIndicatorPresenter!
+    
+    private var recoveryKey: String?
+    private var hasSavedRecoveryKey: Bool = false
+
+    // MARK: - Setup
+    
+    class func instantiate(with viewModel: SecretsSetupRecoveryKeyViewModelType) -> SecretsSetupRecoveryKeyViewController {
+        let viewController = StoryboardScene.SecretsSetupRecoveryKeyViewController.initialScene.instantiate()
+        viewController.viewModel = viewModel
+        viewController.theme = ThemeService.shared().theme
+        return viewController
+    }
+    
+    // MARK: - Life cycle
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        // Do any additional setup after loading the view.
+        
+        self.setupViews()
+        self.activityPresenter = ActivityIndicatorPresenter()
+        self.errorPresenter = MXKErrorAlertPresentation()
+        
+        self.registerThemeServiceDidChangeThemeNotification()
+        self.update(theme: self.theme)
+        
+        self.viewModel.viewDelegate = self
+
+        self.viewModel.process(viewAction: .loadData)
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        // Hide back button
+        self.navigationItem.setHidesBackButton(true, animated: animated)
+    }
+    
+    override var preferredStatusBarStyle: UIStatusBarStyle {
+        return self.theme.statusBarStyle
+    }
+    
+    // MARK: - Private
+    
+    private func update(theme: Theme) {
+        self.theme = theme
+        
+        self.view.backgroundColor = theme.headerBackgroundColor
+        
+        if let navigationBar = self.navigationController?.navigationBar {
+            theme.applyStyle(onNavigationBar: navigationBar)
+        }
+        
+        self.secureKeyImageView.tintColor = theme.textPrimaryColor
+        self.informationLabel.textColor = theme.textPrimaryColor
+        self.recoveryKeyLabel.textColor = theme.textSecondaryColor
+        
+        self.exportButton.update(theme: theme)
+        self.doneButton.update(theme: theme)
+    }
+    
+    private func registerThemeServiceDidChangeThemeNotification() {
+        NotificationCenter.default.addObserver(self, selector: #selector(themeDidChange), name: .themeServiceDidChangeTheme, object: nil)
+    }
+    
+    @objc private func themeDidChange() {
+        self.update(theme: ThemeService.shared().theme)
+    }
+    
+    private func setupViews() {
+        let cancelBarButtonItem = MXKBarButtonItem(title: VectorL10n.cancel, style: .plain) { [weak self] in
+            self?.cancelButtonAction()
+        }
+        
+        self.navigationItem.rightBarButtonItem = cancelBarButtonItem
+        
+        self.vc_removeBackTitle()                
+        
+        self.title = VectorL10n.secretsSetupRecoveryKeyTitle
+        
+        self.secureKeyImageView.image = Asset.Images.secretsSetupKey.image.withRenderingMode(.alwaysTemplate)
+        self.informationLabel.text = VectorL10n.secretsSetupRecoveryKeyInformation
+        self.recoveryKeyLabel.text = VectorL10n.secretsSetupRecoveryKeyLoading
+        
+        self.exportButton.setTitle(VectorL10n.secretsSetupRecoveryKeyExportAction, for: .normal)
+        self.exportButton.isEnabled = false
+        self.doneButton.setTitle(VectorL10n.continue, for: .normal)
+        
+        self.updateDoneButton()
+    }
+
+    private func render(viewState: SecretsSetupRecoveryKeyViewState) {
+        switch viewState {
+        case .loading:
+            self.renderLoading()
+        case .loaded(let recoveryKey):
+            self.renderLoaded(recoveryKey: recoveryKey)
+        case .error(let error):
+            self.render(error: error)
+        }
+    }
+    
+    private func renderLoading() {
+        self.activityPresenter.presentActivityIndicator(on: self.view, animated: true)
+    }
+    
+    private func renderLoaded(recoveryKey: String) {
+        self.activityPresenter.removeCurrentActivityIndicator(animated: true)
+        self.exportButton.isEnabled = true
+        self.recoveryKey = recoveryKey
+        self.recoveryKeyLabel.text = recoveryKey
+    }
+    
+    private func render(error: Error) {
+        self.activityPresenter.removeCurrentActivityIndicator(animated: true)
+        self.errorPresenter.presentError(from: self, forError: error, animated: true) {
+            self.viewModel.process(viewAction: .errorAlertOk)
+        }
+    }
+    
+    private func updateDoneButton() {
+        self.doneButton.isEnabled = self.hasSavedRecoveryKey
+    }
+    
+    private func presentKeepSafeAlert() {
+        let alertController = UIAlertController(title: VectorL10n.secretsSetupRecoveryKeyStorageAlertTitle,
+                                                message: VectorL10n.secretsSetupRecoveryKeyStorageAlertMessage,
+                                                preferredStyle: .alert)
+        
+        alertController.addAction(UIAlertAction(title: VectorL10n.continue, style: .cancel, handler: { action in
+            self.viewModel.process(viewAction: .done)
+        }))
+        
+        self.present(alertController, animated: true, completion: nil)
+    }
+    
+    private func shareRecoveryKey() {
+        guard let recoveryKey = self.recoveryKey else {
+            return
+        }
+        
+        // Set up activity view controller
+        let activityItems: [Any] = [ recoveryKey ]
+        let activityViewController = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
+        
+        activityViewController.completionWithItemsHandler = { (activityType, completed, returnedItems, error) in
+            
+            // Enable made copy button only if user has selected an activity item and has setup recovery key without passphrase
+            if completed {
+                self.hasSavedRecoveryKey = true
+                self.updateDoneButton()
+            }
+        }
+        
+        // Configure source view when activity view controller is presented with a popover
+        if let popoverPresentationController = activityViewController.popoverPresentationController {
+            popoverPresentationController.sourceView = self.exportButton
+            popoverPresentationController.sourceRect = self.exportButton.bounds
+            popoverPresentationController.permittedArrowDirections = [.down, .up]
+        }
+        
+        self.present(activityViewController, animated: true)
+    }
+    
+    // MARK: - Actions
+
+    @IBAction private func exportButtonAction(_ sender: Any) {
+        self.shareRecoveryKey()
+    }
+    
+    @IBAction private func doneButtonAction(_ sender: Any) {
+        self.presentKeepSafeAlert()
+    }
+
+    private func cancelButtonAction() {
+        self.viewModel.process(viewAction: .cancel)
+    }
+}
+
+// MARK: - SecretsSetupRecoveryKeyViewModelViewDelegate
+extension SecretsSetupRecoveryKeyViewController: SecretsSetupRecoveryKeyViewModelViewDelegate {
+
+    func secretsSetupRecoveryKeyViewModel(_ viewModel: SecretsSetupRecoveryKeyViewModelType, didUpdateViewState viewSate: SecretsSetupRecoveryKeyViewState) {
+        self.render(viewState: viewSate)
+    }
+}