#165 new: bio auth

lib/core/utils/platform/auth.dart

@@ -0,0 +1,63 @@
+import 'dart:io';
+
+import 'package:flutter/services.dart';
+import 'package:local_auth/local_auth.dart';
+import 'package:toolbox/core/utils/platform/base.dart';
+import 'package:local_auth/error_codes.dart' as errs;
+
+class BioAuth {
+  const BioAuth._();
+
+  static final _auth = LocalAuthentication();
+
+  static bool get isPlatformSupported => isAndroid || isIOS || isWindows;
+
+  static Future<bool> get isAvail async {
+    if (!isPlatformSupported) return false;
+    final canCheckBiometrics = await _auth.canCheckBiometrics;
+    if (!canCheckBiometrics) {
+      return false;
+    }
+    final biometrics = await _auth.getAvailableBiometrics();
+    if (biometrics.isEmpty) return false;
+    return biometrics.contains(BiometricType.fingerprint) ||
+        biometrics.contains(BiometricType.face);
+  }
+
+  static Future<AuthResult> auth([String? msg]) async {
+    if (!await isAvail) return AuthResult.notAvail;
+    try {
+      final reuslt = await _auth.authenticate(
+        localizedReason: msg ?? 'Auth required',
+        options: const AuthenticationOptions(
+          stickyAuth: true,
+          sensitiveTransaction: true,
+          biometricOnly: true,
+        ),
+      );
+      if (reuslt) {
+        return AuthResult.success;
+      }
+      return AuthResult.fail;
+    } on PlatformException catch (e) {
+      switch (e.code) {
+        case errs.notEnrolled:
+          return AuthResult.notAvail;
+        case errs.lockedOut:
+        case errs.permanentlyLockedOut:
+          exit(0);
+      }
+      return AuthResult.cancel;
+    }
+  }
+}
+
+enum AuthResult {
+  success,
+  // Not match
+  fail,
+  // User cancel
+  cancel,
+  // Device doesn't support biometrics
+  notAvail,
+}