Authentcation

lib/main.dart

@@ -166,7 +166,7 @@ class InvoiceNinjaAppState extends State<InvoiceNinjaApp> {
                         children: <Widget>[
                           Icon(
                             FontAwesomeIcons.lock,
-                            size: 26.0,
+                            size: 24.0,
                             color: Colors.grey[400],
                           ),
                           SizedBox(

lib/ui/settings/settings_list_vm.dart

@@ -9,6 +9,7 @@ import 'package:invoiceninja_flutter/ui/app/app_builder.dart';
 import 'package:invoiceninja_flutter/utils/completers.dart';
 import 'package:invoiceninja_flutter/utils/localization.dart';
 import 'package:invoiceninja_flutter/utils/platforms.dart';
+import 'package:local_auth/local_auth.dart';
 import 'package:redux/redux.dart';
 import 'package:invoiceninja_flutter/ui/auth/login_vm.dart';
 import 'package:invoiceninja_flutter/ui/settings/settings_list.dart';
@@ -101,15 +102,27 @@ class SettingsListVM {
         store.dispatch(UserSettingsChanged(enableDarkMode: value));
         AppBuilder.of(context).rebuild();
       },
-      onRequireAuthenticationChanged:
-          (BuildContext context, bool value) async {
+      onRequireAuthenticationChanged: (BuildContext context, bool value) async {
+        bool authenticated = false;
+        try {
+          authenticated = await LocalAuthentication()
+              .authenticateWithBiometrics(
+                  localizedReason: 'Please authenticate to change the setting',
+                  useErrorDialogs: true,
+                  stickyAuth: false);
+        } catch (e) {
+          print(e);
+        }
+        if (authenticated) {
           final SharedPreferences prefs = await SharedPreferences.getInstance();
           prefs.setBool(kSharedPrefRequireAuthentication, value);
           store.dispatch(UserSettingsChanged(requireAuthentication: value));
+        } else {
+
+        }
       },
       enableDarkMode: store.state.uiState.enableDarkMode,
-      requireAuthentication:
-          store.state.uiState.requireAuthentication,
+      requireAuthentication: store.state.uiState.requireAuthentication,
     );
   }
 }

lib/utils/localization.dart

@@ -14,6 +14,7 @@ class AppLocalization {
 
   static final Map<String, Map<String, String>> _localizedValues = {
     'en': {
+
       'locked': 'Locked',
       'authenticate': 'Authenticate',
       'please_authenticate': 'Please authenticate',