#1899, #1900, #1901 - Implement chat backup setting screens

ElementX/Sources/Services/SecureBackup/SecureBackupControllerProtocol.swift

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+//
+// Copyright 2023 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 Combine
+import Foundation
+
+enum SecureBackupRecoveryKeyState {
+    case unknown
+    case disabled
+    case enabled
+    /// Recovery is not set up properly, the user will need to re-enter it so we can cleanup
+    /// https://github.com/vector-im/element-meta/issues/2107
+    case incomplete
+    case settingUp
+}
+
+enum SecureBackupKeyBackupState {
+    case unknown
+    case enabling
+    case enabled
+    case disabling
+    case disabled
+}
+
+enum SecureBackupControllerError: Error {
+    case failedEnablingKeyBackup
+    case failedDisablingKeyBackup
+    
+    case failedGeneratingRecoveryKey
+    case failedConfirmingRecoveryKey
+}
+
+// sourcery: AutoMockable
+protocol SecureBackupControllerProtocol {
+    var recoveryKeyState: CurrentValuePublisher<SecureBackupRecoveryKeyState, Never> { get }
+    
+    var keyBackupState: CurrentValuePublisher<SecureBackupKeyBackupState, Never> { get }
+    
+    func enableBackup() async -> Result<Void, SecureBackupControllerError>
+    func disableBackup() async -> Result<Void, SecureBackupControllerError>
+    
+    func generateRecoveryKey() async -> Result<String, SecureBackupControllerError>
+    func confirmRecoveryKey(_ key: String) async -> Result<Void, SecureBackupControllerError>
+}
+
+extension SecureBackupControllerMock {
+    convenience init(keyBackupState: SecureBackupKeyBackupState, recoveryKeyState: SecureBackupRecoveryKeyState) {
+        self.init()
+        underlyingKeyBackupState = CurrentValueSubject<SecureBackupKeyBackupState, Never>(keyBackupState).asCurrentValuePublisher()
+        underlyingRecoveryKeyState = CurrentValueSubject<SecureBackupRecoveryKeyState, Never>(recoveryKeyState).asCurrentValuePublisher()
+    }
+}