taler-ios

commit aeab8aa5d8200e5605cb45cb8d9e7aa890ff242b
parent 1df0c238686c127613b2658a1791e282cffd58fe
Author: Marc Stibane <marc@taler.net>
Date:   Thu,  5 Jun 2025 16:14:15 +0200

BiometricService

Diffstat:
A
TalerWallet1/Controllers/BiometricService.swift
 | 
75
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 75 insertions(+), 0 deletions(-)
diff --git a/TalerWallet1/Controllers/BiometricService.swift b/TalerWallet1/Controllers/BiometricService.swift
@@ -0,0 +1,75 @@
+/*
+ * This file is part of GNU Taler, ©2022-25 Taler Systems S.A.
+ * See LICENSE.md
+ */
+/**
+ *
+ * @author Marc Stibane
+ */
+import SwiftUI
+import LocalAuthentication
+
+class BiometricService: ObservableObject {
+    static let shared = BiometricService()
+    @Published var isAuthenticated = false
+    @Published var authenticationError: String?
+
+    private var context: LAContext?
+
+    func authenticateUser() {
+        let reason = resetContext()
+
+        guard let context = context else {
+            authenticationError = String(localized: "Failed to initialize authentication context.", comment: "FaceID")
+            return
+        }
+        guard context.canEvaluatePolicy(.deviceOwnerAuthentication, error: nil) else {
+            authenticationError = String(localized: "Authentication is not available on this device.", comment: "FaceID")
+            return
+        }
+        context.evaluatePolicy(.deviceOwnerAuthentication, localizedReason: reason) { [weak self] success, authenticationError in
+            DispatchQueue.main.async {
+                if success {
+                    self?.isAuthenticated = true
+                    self?.authenticationError = nil
+                } else if let error = authenticationError as? LAError {
+                    self?.authenticationError = self?.errorMessage(for: error)
+                } else {
+                    self?.authenticationError = String(localized: "Unknown authentication error occurred.", comment: "FaceID")
+                }
+            }
+        }
+    }
+
+    private func resetContext() -> String {
+        let reason = String(localized: "Authenticate to access your money", comment: "FaceID")
+        context = LAContext()
+        context?.localizedReason = reason
+        context?.localizedCancelTitle = String(localized: "Cancel", comment: "FaceID")
+        context?.localizedFallbackTitle = String(localized: "Use Passcode", comment: "FaceID")
+        return reason
+    }
+
+    private func errorMessage(for error: LAError) -> String {
+        switch error.code {
+            case .authenticationFailed:
+                return String(localized: "Authentication failed. Please try again.", comment: "FaceID")
+            case .userCancel:
+                return String(localized: "You canceled the authentication.", comment: "FaceID")
+            case .userFallback:
+                return String(localized: "You chose to use the fallback option.", comment: "FaceID")
+            case .systemCancel:
+                return String(localized: "The system canceled the authentication.", comment: "FaceID")
+            case .passcodeNotSet:
+                return String(localized: "Passcode is not set on this device.", comment: "FaceID")
+            case .biometryNotAvailable:
+                return String(localized: "Biometric authentication is not available on this device.", comment: "FaceID")
+            case .biometryNotEnrolled:
+                return String(localized: "No biometrics are enrolled on this device.", comment: "FaceID")
+            case .biometryLockout:
+                return String(localized: "Biometric authentication is locked. Enter your passcode to unlock.", comment: "FaceID")
+            default:
+                return String(localized: "An unknown error occurred.", comment: "FaceID")
+        }
+    }
+}