flutter_password_scoring 0.0.2+1

Helper library to score password strength with `dart_zxcvbn` and provide suggestions for improvement.

flutter_password_scoring

❗ THIS PACKAGE IS STILL WORK IN PROGRESS ❗

Description

The primary goal of this package is to support dart_zxcvbn in Flutter.

To achieve this and, as much as possible, not block the main thread and avoid dropped frames, we create an Isolate in which the dart_zxcvbn library is initialized and where further user password evaluations take place. Responses from the library are passed to the PasswordScoringBuilder (which acts as a facade for StreamBuilder), and that's where the widget tree is constructed.

Usage

1. Declare default handler for scorer isolate somewhere in your code - it has to be global function or static member of some class!

   import 'dart:isolate';
   
   import 'package:dart_zxcvbn/dart_zxcvbn.dart';
   import 'package:dart_zxcvbn_language_common/dart_zxcvbn_language_common.dart';
   import 'package:dart_zxcvbn_language_en/dart_zxcvbn_language_en.dart';
   
   Future<void> handleScoring(SendPort sendPort) async {
     ReceivePort receiverPort = ReceivePort();
     sendPort.send(receiverPort.sendPort);
   
     final langCommon = LanguageCommon();
     final langEn = LanguageEn();
   
     zxcvbn.setOptions(Options(
       dictionary: Dictionary.merge([
         langCommon.dictionary,
         langEn.dictionary,
       ]),
       graphs: langCommon.adjacencyGraphs,
       translations: langCommon.translations,
     ));
   
     // Used to refresh response when locale changes
     String lastPassword = '';
   
     await for (var message in receiverPort) {
       if (message is Locale) {
         zxcvbn.setOptions(Options(
           translations: message.languageCode == 'en'
               ? langEn.translations
               : langCommon.translations,
         ));
       }
   
       lastPassword = message is String ? message : lastPassword;
       if (lastPassword.isNotEmpty) {
         final result = zxcvbn(lastPassword);
   
         sendPort.send(result);
       }
     }
   }
   

2. Use PasswordScoringBuilder to build your UI

   PasswordScoringBuilder(
     handler: handleScoring,
     loadingPlaceholder: const Center(
       child: CircularProgressIndicator(),
     ),
     builder: (
       BuildContext context,
       Result? data,
       PasswordScoringHelper helper,
     ) {
      return Placeholder();
     },
   );
   

Related packages

Package	Details
dart_zxcvbn	README | pub
dart_zxcvbn_language_common	README | pub
dart_zxcvbn_language_en	README | pub
dart_zxcvbn_language_pl	README | pub
flutter_password_scoring	README | pub

License

• see LICENSE