Implement manually verify device screen.

Riot/Modules/KeyVerification/Device/ManuallyVerify/KeyVerificationManuallyVerifyViewModel.swift

@@ -0,0 +1,113 @@
+// File created from ScreenTemplate
+// $ createScreen.sh KeyVerification/Device/ManuallyVerify KeyVerificationManuallyVerify
+/*
+ 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 Foundation
+
+enum KeyVerificationManuallyVerifyViewModelError: Error {
+    case unknown
+    case deviceNotFound
+}
+
+final class KeyVerificationManuallyVerifyViewModel: KeyVerificationManuallyVerifyViewModelType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+
+    private let session: MXSession
+    private let deviceId: String
+    private let userId: String
+    
+    private var currentOperation: MXHTTPOperation?
+    
+    // MARK: Public
+
+    weak var viewDelegate: KeyVerificationManuallyVerifyViewModelViewDelegate?
+    weak var coordinatorDelegate: KeyVerificationManuallyVerifyViewModelCoordinatorDelegate?
+    
+    // MARK: - Setup
+    
+    init(session: MXSession, deviceId: String, userId: String) {
+        self.session = session
+        self.deviceId = deviceId
+        self.userId = userId
+    }
+    
+    deinit {
+        self.cancelOperations()
+    }
+    
+    // MARK: - Public
+    
+    func process(viewAction: KeyVerificationManuallyVerifyViewAction) {
+        switch viewAction {
+        case .loadData:
+            self.loadData()
+        case .verify:
+            self.verifyDevice()
+        case .cancel:
+            self.cancelOperations()
+            self.coordinatorDelegate?.keyVerificationManuallyVerifyViewModelDidCancel(self)
+        }
+    }
+    
+    // MARK: - Private
+    
+    private func loadData() {
+        
+        guard let deviceInfo =  self.session.crypto.device(withDeviceId: self.deviceId, ofUser: self.userId) else {
+            self.update(viewState: .error(KeyVerificationManuallyVerifyViewModelError.deviceNotFound))
+            return
+        }
+        
+        var deviceKey: String?
+        
+        if let deviceFingerprint = deviceInfo.fingerprint {
+            deviceKey = MXTools.addWhiteSpaces(to: deviceFingerprint, every: 4)
+        }
+        
+        let viewData = KeyVerificationManuallyVerifyViewData(deviceId: self.deviceId, deviceName: deviceInfo.displayName, deviceKey: deviceKey)
+        self.update(viewState: .loaded(viewData))
+    }
+    
+    private func update(viewState: KeyVerificationManuallyVerifyViewState) {
+        self.viewDelegate?.keyVerificationManuallyVerifyViewModel(self, didUpdateViewState: viewState)
+    }
+    
+    private func verifyDevice() {
+        
+        self.update(viewState: .loading)
+        
+        self.session.crypto.setDeviceVerification(.verified, forDevice: self.deviceId, ofUser: self.userId, success: { [weak self] in
+            guard let self = self else {
+                return
+            }
+            self.coordinatorDelegate?.keyVerificationManuallyVerifyViewModel(self, didVerifiedDeviceWithId: self.deviceId, of: self.userId)
+        }, failure: { [weak self] (error) in
+            guard let self = self else {
+                return
+            }
+            let finalError = error ?? KeyVerificationManuallyVerifyViewModelError.unknown
+            self.update(viewState: .error(finalError))
+        })
+    }
+    
+    private func cancelOperations() {
+        self.currentOperation?.cancel()
+    }
+}