Refactor DeviceVerification prefix classes to KeyVerification where needed. And move key verification related classes into the same module KeyVerification.

2026-04-25 19:10:49 +02:00 · 2020-03-18 17:39:26 +01:00
parent 991e2fe5f7
commit 23a02c362c
91 changed files with 819 additions and 803 deletions
@@ -0,0 +1,83 @@
+// File created from ScreenTemplate
+// $ createScreen.sh DeviceVerification/Loading DeviceVerificationDataLoading
+/*
+ Copyright 2019 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 Foundation
+import UIKit
+
+final class KeyVerificationDataLoadingCoordinator: KeyVerificationDataLoadingCoordinatorType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private var keyVerificationDataLoadingViewModel: KeyVerificationDataLoadingViewModelType
+    private let keyVerificationDataLoadingViewController: KeyVerificationDataLoadingViewController
+    
+    // MARK: Public
+
+    // Must be used only internally
+    var childCoordinators: [Coordinator] = []
+    
+    weak var delegate: KeyVerificationDataLoadingCoordinatorDelegate?
+    
+    // MARK: - Setup
+    
+    init(session: MXSession, otherUserId: String, otherDeviceId: String) {
+        let keyVerificationDataLoadingViewModel = KeyVerificationDataLoadingViewModel(session: session, otherUserId: otherUserId, otherDeviceId: otherDeviceId)
+        let keyVerificationDataLoadingViewController = KeyVerificationDataLoadingViewController.instantiate(with: keyVerificationDataLoadingViewModel)
+        self.keyVerificationDataLoadingViewModel = keyVerificationDataLoadingViewModel
+        self.keyVerificationDataLoadingViewController = keyVerificationDataLoadingViewController
+    }
+    
+    init(session: MXSession, incomingKeyVerificationRequest: MXKeyVerificationRequest) {
+        let keyVerificationDataLoadingViewModel = KeyVerificationDataLoadingViewModel(session: session, keyVerificationRequest: incomingKeyVerificationRequest)
+        let keyVerificationDataLoadingViewController = KeyVerificationDataLoadingViewController.instantiate(with: keyVerificationDataLoadingViewModel)
+        self.keyVerificationDataLoadingViewModel = keyVerificationDataLoadingViewModel
+        self.keyVerificationDataLoadingViewController = keyVerificationDataLoadingViewController
+    }
+    
+    // MARK: - Public methods
+    
+    func start() {            
+        self.keyVerificationDataLoadingViewModel.coordinatorDelegate = self
+    }
+    
+    func toPresentable() -> UIViewController {
+        return self.keyVerificationDataLoadingViewController
+    }
+}
+
+// MARK: - KeyVerificationDataLoadingViewModelCoordinatorDelegate
+extension KeyVerificationDataLoadingCoordinator: KeyVerificationDataLoadingViewModelCoordinatorDelegate {
+    
+    func keyVerificationDataLoadingViewModel(_ viewModel: KeyVerificationDataLoadingViewModelType, didAcceptKeyVerificationRequest keyVerificationRequest: MXKeyVerificationRequest) {
+        self.delegate?.keyVerificationDataLoadingCoordinator(self, didAcceptKeyVerificationRequest: keyVerificationRequest)
+    }    
+    
+    func keyVerificationDataLoadingViewModel(_ viewModel: KeyVerificationDataLoadingViewModelType, didAcceptKeyVerificationWithTransaction transaction: MXKeyVerificationTransaction) {
+        self.delegate?.keyVerificationDataLoadingCoordinator(self, didAcceptKeyVerificationRequestWithTransaction: transaction)
+    }
+    
+    func keyVerificationDataLoadingViewModel(_ viewModel: KeyVerificationDataLoadingViewModelType, didLoadUser user: MXUser, device: MXDeviceInfo) {
+        self.delegate?.keyVerificationDataLoadingCoordinator(self, didLoadUser: user, device: device)
+    }
+
+    func keyVerificationDataLoadingViewModelDidCancel(_ viewModel: KeyVerificationDataLoadingViewModelType) {
+        self.delegate?.keyVerificationDataLoadingCoordinatorDidCancel(self)
+    }
+}
@@ -0,0 +1,31 @@
+// File created from ScreenTemplate
+// $ createScreen.sh DeviceVerification/Loading DeviceVerificationDataLoading
+/*
+ Copyright 2019 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 Foundation
+
+protocol KeyVerificationDataLoadingCoordinatorDelegate: class {
+    func keyVerificationDataLoadingCoordinator(_ coordinator: KeyVerificationDataLoadingCoordinatorType, didLoadUser user: MXUser, device: MXDeviceInfo)
+    func keyVerificationDataLoadingCoordinator(_ coordinator: KeyVerificationDataLoadingCoordinatorType, didAcceptKeyVerificationRequestWithTransaction transaction: MXKeyVerificationTransaction)
+    func keyVerificationDataLoadingCoordinator(_ coordinator: KeyVerificationDataLoadingCoordinatorType, didAcceptKeyVerificationRequest keyVerificationRequest: MXKeyVerificationRequest)
+    func keyVerificationDataLoadingCoordinatorDidCancel(_ coordinator: KeyVerificationDataLoadingCoordinatorType)
+}
+
+/// `KeyVerificationDataLoadingCoordinatorType` is a protocol describing a Coordinator that handle key backup setup passphrase navigation flow.
+protocol KeyVerificationDataLoadingCoordinatorType: Coordinator, Presentable {
+    var delegate: KeyVerificationDataLoadingCoordinatorDelegate? { get }
+}
@@ -0,0 +1,25 @@
+// File created from ScreenTemplate
+// $ createScreen.sh DeviceVerification/Loading DeviceVerificationDataLoading
+/*
+ Copyright 2019 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 Foundation
+
+/// KeyVerificationDataLoadingViewController view actions exposed to view model
+enum KeyVerificationDataLoadingViewAction {
+    case loadData
+    case cancel
+}
@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="dBQ-CG-VDL">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Key Verification Data Loading View Controller-->
+        <scene sceneID="EyC-m5-6uM">
+            <objects>
+                <viewController extendedLayoutIncludesOpaqueBars="YES" automaticallyAdjustsScrollViewInsets="NO" id="dBQ-CG-VDL" customClass="KeyVerificationDataLoadingViewController" customModule="Riot" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ht4-fu-3rS">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <scrollView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="jOh-c7-uod">
+                                <rect key="frame" x="0.0" y="20" width="375" height="647"/>
+                                <subviews>
+                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="c4q-B8-hPy">
+                                        <rect key="frame" x="0.0" y="0.0" width="375" height="428"/>
+                                        <subviews>
+                                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="fNE-v3-2lx">
+                                                <rect key="frame" x="0.0" y="0.0" width="375" height="428"/>
+                                                <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                                <constraints>
+                                                    <constraint firstAttribute="width" priority="750" constant="500" id="9am-iX-rzi"/>
+                                                </constraints>
+                                            </view>
+                                        </subviews>
+                                        <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                        <constraints>
+                                            <constraint firstItem="fNE-v3-2lx" firstAttribute="top" secondItem="c4q-B8-hPy" secondAttribute="top" id="bHO-0I-Jjh"/>
+                                            <constraint firstItem="fNE-v3-2lx" firstAttribute="centerX" secondItem="c4q-B8-hPy" secondAttribute="centerX" id="fGs-s5-GHA"/>
+                                            <constraint firstItem="fNE-v3-2lx" firstAttribute="leading" relation="greaterThanOrEqual" secondItem="c4q-B8-hPy" secondAttribute="leading" id="jpJ-bp-Vmz"/>
+                                            <constraint firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="fNE-v3-2lx" secondAttribute="trailing" id="juO-Zk-MPs"/>
+                                            <constraint firstAttribute="bottom" secondItem="fNE-v3-2lx" secondAttribute="bottom" id="sZa-ea-aZQ"/>
+                                            <constraint firstAttribute="height" constant="428" id="vx4-4u-WS1"/>
+                                        </constraints>
+                                    </view>
+                                </subviews>
+                                <constraints>
+                                    <constraint firstAttribute="bottom" secondItem="c4q-B8-hPy" secondAttribute="bottom" id="KlD-dP-EYo"/>
+                                    <constraint firstItem="c4q-B8-hPy" firstAttribute="width" secondItem="jOh-c7-uod" secondAttribute="width" id="Tly-og-biF"/>
+                                    <constraint firstAttribute="trailing" secondItem="c4q-B8-hPy" secondAttribute="trailing" id="fNe-8B-X6c"/>
+                                    <constraint firstItem="c4q-B8-hPy" firstAttribute="leading" secondItem="jOh-c7-uod" secondAttribute="leading" id="h5p-NS-unN"/>
+                                    <constraint firstItem="c4q-B8-hPy" firstAttribute="top" secondItem="jOh-c7-uod" secondAttribute="top" id="zPm-BG-Pm8"/>
+                                </constraints>
+                            </scrollView>
+                        </subviews>
+                        <color key="backgroundColor" red="0.94509803921568625" green="0.96078431372549022" blue="0.97254901960784312" alpha="1" colorSpace="calibratedRGB"/>
+                        <constraints>
+                            <constraint firstAttribute="trailing" secondItem="jOh-c7-uod" secondAttribute="trailing" id="7K8-MG-xLT"/>
+                            <constraint firstItem="6ex-OQ-2sZ" firstAttribute="bottom" secondItem="jOh-c7-uod" secondAttribute="bottom" id="DGP-MJ-g6l"/>
+                            <constraint firstItem="jOh-c7-uod" firstAttribute="leading" secondItem="Ht4-fu-3rS" secondAttribute="leading" id="TGc-b5-uMu"/>
+                            <constraint firstItem="6ex-OQ-2sZ" firstAttribute="leading" secondItem="jOh-c7-uod" secondAttribute="leading" id="Z7r-yd-J4e"/>
+                            <constraint firstItem="jOh-c7-uod" firstAttribute="trailing" secondItem="6ex-OQ-2sZ" secondAttribute="trailing" id="jVN-Fr-MKN"/>
+                            <constraint firstItem="jOh-c7-uod" firstAttribute="top" secondItem="6ex-OQ-2sZ" secondAttribute="top" id="s7K-jf-P1z"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="6ex-OQ-2sZ"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="bLY-II-iJ3" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-1703" y="255"/>
+        </scene>
+    </scenes>
+</document>
@@ -0,0 +1,177 @@
+// File created from ScreenTemplate
+// $ createScreen.sh DeviceVerification/Loading DeviceVerificationDataLoading
+/*
+ Copyright 2019 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 KeyVerificationDataLoadingViewController: UIViewController {
+    
+    // MARK: - Properties
+    
+    // MARK: Outlets
+    
+    // MARK: Private
+
+    private var viewModel: KeyVerificationDataLoadingViewModelType!
+    private var theme: Theme!
+    private var errorPresenter: MXKErrorPresentation!
+    private var activityPresenter: ActivityIndicatorPresenter!
+
+    // MARK: - Setup
+    
+    class func instantiate(with viewModel: KeyVerificationDataLoadingViewModelType) -> KeyVerificationDataLoadingViewController {
+        let viewController = StoryboardScene.KeyVerificationDataLoadingViewController.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.title = VectorL10n.deviceVerificationTitle
+        self.vc_removeBackTitle()
+        
+        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 var preferredStatusBarStyle: UIStatusBarStyle {
+        return self.theme.statusBarStyle
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        // Hide back button
+        self.navigationItem.setHidesBackButton(true, animated: animated)
+    }
+    
+    // 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)
+        }
+    }
+    
+    private func registerThemeServiceDidChangeThemeNotification() {
+        NotificationCenter.default.addObserver(self, selector: #selector(themeDidChange), name: .themeServiceDidChangeTheme, object: nil)
+    }
+    
+    private func setupViews() {
+        let cancelBarButtonItem = MXKBarButtonItem(title: VectorL10n.cancel, style: .plain) { [weak self] in
+            self?.cancelButtonAction()
+        }
+        
+        self.navigationItem.rightBarButtonItem = cancelBarButtonItem
+    }
+
+    private func render(viewState: KeyVerificationDataLoadingViewState) {
+        switch viewState {
+        case .loading:
+            self.renderLoading()
+        case .loaded:
+            self.renderLoaded()
+        case .error(let error):
+            self.render(error: error)
+        case .errorMessage(let message):
+            self.renderError(message: message)
+        }
+    }
+    
+    private func renderLoading() {
+        self.activityPresenter.presentActivityIndicator(on: self.view, animated: true)
+    }
+    
+    private func renderLoaded() {
+        self.activityPresenter.removeCurrentActivityIndicator(animated: true)
+    }
+    
+    private func render(error: Error) {
+        
+        var shouldDisplayError = true
+        var message: String?
+        
+        switch error {
+        case KeyVerificationDataLoadingViewModelError.transactionCancelled:
+            message = VectorL10n.deviceVerificationCancelled
+        case KeyVerificationDataLoadingViewModelError.transactionCancelledByMe(reason: let reason):
+            if reason.value != MXTransactionCancelCode.user().value {
+                message = VectorL10n.deviceVerificationCancelledByMe(reason.humanReadable)
+            } else {
+                shouldDisplayError = false
+            }
+        default:
+            break
+        }
+        
+        if shouldDisplayError {
+            
+            let completion = {
+                self.viewModel.process(viewAction: .cancel)
+            }
+            
+            if let message = message {
+                self.errorPresenter.presentError(from: self, title: "", message: message, animated: true, handler: completion)
+            } else {
+                self.errorPresenter.presentError(from: self, forError: error, animated: true, handler: completion)
+            }
+        }
+    }
+
+    private func renderError(message: String) {
+        self.errorPresenter.presentError(from: self, title: "", message: message, animated: true, handler: {
+            self.viewModel.process(viewAction: .cancel)
+        })
+    }
+
+    // MARK: - Actions
+
+    @objc private func themeDidChange() {
+        self.update(theme: ThemeService.shared().theme)
+    }
+
+    private func cancelButtonAction() {
+        self.viewModel.process(viewAction: .cancel)
+    }
+}
+
+
+// MARK: - KeyVerificationDataLoadingViewModelViewDelegate
+extension KeyVerificationDataLoadingViewController: KeyVerificationDataLoadingViewModelViewDelegate {
+
+    func keyVerificationDataLoadingViewModel(_ viewModel: KeyVerificationDataLoadingViewModelType, didUpdateViewState viewSate: KeyVerificationDataLoadingViewState) {
+        self.render(viewState: viewSate)
+    }
+}
@@ -0,0 +1,150 @@
+// File created from ScreenTemplate
+// $ createScreen.sh DeviceVerification/Loading DeviceVerificationDataLoading
+/*
+ Copyright 2019 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 Foundation
+
+enum KeyVerificationDataLoadingViewModelError: Error {
+    case unknown
+    case transactionCancelled
+    case transactionCancelledByMe(reason: MXTransactionCancelCode)
+}
+
+final class KeyVerificationDataLoadingViewModel: KeyVerificationDataLoadingViewModelType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+
+    private let session: MXSession
+    private let otherUserId: String?
+    private let otherDeviceId: String?
+    private let keyVerificationService = KeyVerificationService()
+    
+    private let keyVerificationRequest: MXKeyVerificationRequest?
+    
+    private var currentOperation: MXHTTPOperation?
+    
+    // MARK: Public
+
+    weak var viewDelegate: KeyVerificationDataLoadingViewModelViewDelegate?
+    weak var coordinatorDelegate: KeyVerificationDataLoadingViewModelCoordinatorDelegate?
+    
+    // MARK: - Setup
+    
+    init(session: MXSession, otherUserId: String, otherDeviceId: String) {
+        self.session = session
+        self.otherUserId = otherUserId
+        self.otherDeviceId = otherDeviceId
+        self.keyVerificationRequest = nil
+    }
+    
+    init(session: MXSession, keyVerificationRequest: MXKeyVerificationRequest) {
+        self.session = session
+        self.otherUserId = nil
+        self.otherDeviceId = nil
+        self.keyVerificationRequest = keyVerificationRequest
+    }
+    
+    deinit {
+        self.currentOperation?.cancel()
+    }
+    
+    // MARK: - Public
+    
+    func process(viewAction: KeyVerificationDataLoadingViewAction) {
+        switch viewAction {
+        case .loadData:
+            self.loadData()
+        case .cancel:
+            self.coordinatorDelegate?.keyVerificationDataLoadingViewModelDidCancel(self)
+        }
+    }
+    
+    // MARK: - Private
+    
+    private func loadData() {
+        if let keyVerificationRequest = self.keyVerificationRequest {
+            self.acceptKeyVerificationRequest(keyVerificationRequest)
+        } else {
+            self.downloadOtherDeviceKeys()
+        }
+    }
+    
+    private func acceptKeyVerificationRequest(_ keyVerificationRequest: MXKeyVerificationRequest) {
+        
+        self.update(viewState: .loading)
+        
+        keyVerificationRequest.accept(withMethods: self.keyVerificationService.supportedKeyVerificationMethods(), success: { [weak self] in
+            guard let self = self else {
+                return
+            }
+            
+            self.coordinatorDelegate?.keyVerificationDataLoadingViewModel(self, didAcceptKeyVerificationRequest: keyVerificationRequest)
+            
+        }, failure: { [weak self] (error) in
+            guard let self = self else {
+                return
+            }
+            self.update(viewState: .error(error))
+        })
+    }
+    
+    private func downloadOtherDeviceKeys() {
+        guard let crypto = session.crypto,
+            let otherUserId = self.otherUserId,
+            let otherDeviceId = self.otherDeviceId else {
+            self.update(viewState: .errorMessage(VectorL10n.deviceVerificationErrorCannotLoadDevice))
+            NSLog("[KeyVerificationDataLoadingViewModel] Error session.crypto is nil")
+            return
+        }
+        
+        if let otherUser = session.user(withUserId: otherUserId) {
+            
+            self.update(viewState: .loading)
+           
+            self.currentOperation = crypto.downloadKeys([otherUserId], forceDownload: false, success: { [weak self] (usersDevicesMap, crossSigningKeysMap) in
+                guard let sself = self else {
+                    return
+                }
+                
+                if let otherDevice = usersDevicesMap?.object(forDevice: otherDeviceId, forUser: otherUserId) {
+                    sself.update(viewState: .loaded)
+                    sself.coordinatorDelegate?.keyVerificationDataLoadingViewModel(sself, didLoadUser: otherUser, device: otherDevice)
+                } else {
+                    sself.update(viewState: .errorMessage(VectorL10n.deviceVerificationErrorCannotLoadDevice))
+                }
+                
+                }, failure: { [weak self] (error) in
+                    guard let sself = self else {
+                        return
+                    }
+                    
+                    let finalError = error ?? KeyVerificationDataLoadingViewModelError.unknown
+                    
+                    sself.update(viewState: .error(finalError))
+            })
+            
+        } else {
+            self.update(viewState: .errorMessage(VectorL10n.deviceVerificationErrorCannotLoadDevice))
+        }
+    }
+    
+    private func update(viewState: KeyVerificationDataLoadingViewState) {
+        self.viewDelegate?.keyVerificationDataLoadingViewModel(self, didUpdateViewState: viewState)
+    }
+}
@@ -0,0 +1,39 @@
+// File created from ScreenTemplate
+// $ createScreen.sh DeviceVerification/Loading DeviceVerificationDataLoading
+/*
+ Copyright 2019 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 Foundation
+
+protocol KeyVerificationDataLoadingViewModelViewDelegate: class {
+    func keyVerificationDataLoadingViewModel(_ viewModel: KeyVerificationDataLoadingViewModelType, didUpdateViewState viewSate: KeyVerificationDataLoadingViewState)
+}
+
+protocol KeyVerificationDataLoadingViewModelCoordinatorDelegate: class {
+    func keyVerificationDataLoadingViewModel(_ viewModel: KeyVerificationDataLoadingViewModelType, didLoadUser user: MXUser, device: MXDeviceInfo)
+    func keyVerificationDataLoadingViewModel(_ viewModel: KeyVerificationDataLoadingViewModelType, didAcceptKeyVerificationWithTransaction transaction: MXKeyVerificationTransaction)
+    func keyVerificationDataLoadingViewModel(_ viewModel: KeyVerificationDataLoadingViewModelType, didAcceptKeyVerificationRequest keyVerificationRequest: MXKeyVerificationRequest)
+    func keyVerificationDataLoadingViewModelDidCancel(_ viewModel: KeyVerificationDataLoadingViewModelType)
+}
+
+/// Protocol describing the view model used by `KeyVerificationDataLoadingViewController`
+protocol KeyVerificationDataLoadingViewModelType {
+        
+    var viewDelegate: KeyVerificationDataLoadingViewModelViewDelegate? { get set }
+    var coordinatorDelegate: KeyVerificationDataLoadingViewModelCoordinatorDelegate? { get set }
+    
+    func process(viewAction: KeyVerificationDataLoadingViewAction)
+}
@@ -0,0 +1,27 @@
+// File created from ScreenTemplate
+// $ createScreen.sh DeviceVerification/Loading DeviceVerificationDataLoading
+/*
+ Copyright 2019 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 Foundation
+
+/// KeyVerificationDataLoadingViewController view state
+enum KeyVerificationDataLoadingViewState {
+    case loading
+    case loaded
+    case error(Error)
+    case errorMessage(String)
+}