Introduce PinCodePreferences

Riot/Modules/SetPinCode/PinCodePreferences.swift

@@ -0,0 +1,60 @@
+/*
+Copyright 2018 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
+
+/// Pin code preferences.
+@objcMembers
+final class PinCodePreferences: NSObject {
+    
+    // MARK: - Constants
+    
+    private enum UserDefaultsKeys {
+        static let pin = "pin"
+    }
+    
+    static let shared = PinCodePreferences()
+    
+    // MARK: - Properties
+    
+    // MARK: - Public
+    
+    /// Setting to force protection by pin code
+    var forcePinProtection: Bool {
+        return RiotSettings.shared.forcePinProtection
+    }
+    let allowedNumberOfTrialsBeforeAlert: Int = 5
+    let graceTimeInSeconds: Int = 1
+    
+    /// Is user has set a pin
+    var isPinSet: Bool {
+        return pin != nil
+    }
+    
+    /// Saved user PIN
+    var pin: String? {
+        get {
+            return UserDefaults.standard.object(forKey: UserDefaultsKeys.pin) as? String
+        } set {
+            UserDefaults.standard.set(newValue, forKey: UserDefaultsKeys.pin)
+        }
+    }
+    
+    /// Resets user PIN
+    func reset() {
+        pin = nil
+    }
+}