complex pernament password

lowercase, uppercase, digit, length>=8

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/common/widgets/custom_password.dart

@@ -0,0 +1,121 @@
+// https://github.com/rodrigobastosv/fancy_password_field
+import 'package:flutter/material.dart';
+import 'package:flutter_hbb/common.dart';
+import 'package:get/get.dart';
+import 'package:password_strength/password_strength.dart';
+
+abstract class ValidationRule {
+  String get name;
+  bool validate(String value);
+}
+
+class UppercaseValidationRule extends ValidationRule {
+  @override
+  String get name => translate('uppercase');
+  @override
+  bool validate(String value) {
+    return value.contains(RegExp(r'[A-Z]'));
+  }
+}
+
+class LowercaseValidationRule extends ValidationRule {
+  @override
+  String get name => translate('lowercase');
+
+  @override
+  bool validate(String value) {
+    return value.contains(RegExp(r'[a-z]'));
+  }
+}
+
+class DigitValidationRule extends ValidationRule {
+  @override
+  String get name => translate('digit');
+
+  @override
+  bool validate(String value) {
+    return value.contains(RegExp(r'[0-9]'));
+  }
+}
+
+class SpecialCharacterValidationRule extends ValidationRule {
+  @override
+  String get name => translate('special character');
+
+  @override
+  bool validate(String value) {
+    return value.contains(RegExp(r'[!@#$%^&*(),.?":{}|<>]'));
+  }
+}
+
+class MinCharactersValidationRule extends ValidationRule {
+  final int _numberOfCharacters;
+  MinCharactersValidationRule(this._numberOfCharacters);
+
+  @override
+  String get name => translate('length>=$_numberOfCharacters');
+
+  @override
+  bool validate(String value) {
+    return value.length >= _numberOfCharacters;
+  }
+}
+
+class PasswordStrengthIndicator extends StatelessWidget {
+  final RxString password;
+  final double weakMedium = 0.33;
+  final double mediumStrong = 0.67;
+  const PasswordStrengthIndicator({Key? key, required this.password})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Obx(() {
+      var strength = estimatePasswordStrength(password.value);
+      return Row(
+        children: [
+          Expanded(
+              child: _indicator(
+                  password.isEmpty ? Colors.grey : _getColor(strength))),
+          Expanded(
+              child: _indicator(password.isEmpty || strength < weakMedium
+                  ? Colors.grey
+                  : _getColor(strength))),
+          Expanded(
+              child: _indicator(password.isEmpty || strength < mediumStrong
+                  ? Colors.grey
+                  : _getColor(strength))),
+          Text(password.isEmpty ? '' : translate(_getLabel(strength)))
+              .marginOnly(left: password.isEmpty ? 0 : 8),
+        ],
+      );
+    });
+  }
+
+  Widget _indicator(Color color) {
+    return Container(
+      height: 8,
+      color: color,
+    );
+  }
+
+  String _getLabel(double strength) {
+    if (strength < weakMedium) {
+      return 'Weak';
+    } else if (strength < mediumStrong) {
+      return 'Medium';
+    } else {
+      return 'Strong';
+    }
+  }
+
+  Color _getColor(double strength) {
+    if (strength < weakMedium) {
+      return Colors.yellow;
+    } else if (strength < mediumStrong) {
+      return Colors.blue;
+    } else {
+      return Colors.green;
+    }
+  }
+}