Secrets setup: Handle set up recovery key screen.

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

@@ -0,0 +1,72 @@
+// 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 Foundation
+
+final class SecretsSetupRecoveryKeyViewModel: SecretsSetupRecoveryKeyViewModelType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let recoveryService: MXRecoveryService
+    private let passphrase: String?
+    
+    // MARK: Public
+
+    weak var viewDelegate: SecretsSetupRecoveryKeyViewModelViewDelegate?
+    weak var coordinatorDelegate: SecretsSetupRecoveryKeyViewModelCoordinatorDelegate?
+    
+    // MARK: - Setup
+    
+    init(recoveryService: MXRecoveryService, passphrase: String?) {
+        self.recoveryService = recoveryService
+        self.passphrase = passphrase
+    }
+    
+    // MARK: - Public
+    
+    func process(viewAction: SecretsSetupRecoveryKeyViewAction) {
+        switch viewAction {
+        case .loadData:
+            self.createSecureKey()
+        case .done:
+            self.coordinatorDelegate?.secretsSetupRecoveryKeyViewModelDidComplete(self)
+        case .errorAlertOk:
+            self.coordinatorDelegate?.secretsSetupRecoveryKeyViewModelDidFailed(self)
+        case .cancel:
+            self.coordinatorDelegate?.secretsSetupRecoveryKeyViewModelDidCancel(self)
+        }
+    }
+    
+    // MARK: - Private
+    
+    private func createSecureKey() {
+        self.update(viewState: .loading)
+                
+        self.recoveryService.createRecovery(forSecrets: nil, withPassphrase: self.passphrase, success: { secretStorageKeyCreationInfo in
+            self.update(viewState: .loaded(secretStorageKeyCreationInfo.recoveryKey))
+        }, failure: { error in
+            self.update(viewState: .error(error))
+        })
+    }
+    
+    private func update(viewState: SecretsSetupRecoveryKeyViewState) {
+        self.viewDelegate?.secretsSetupRecoveryKeyViewModel(self, didUpdateViewState: viewState)
+    }
+}