checkPasswordStrength method

Implementation

Map<String, dynamic> checkPasswordStrength(String password) {
  int score = 0;
  final feedback = <String>[];

  if (password.length >= 8) score += 1;
  else feedback.add('Password should be at least 8 characters long');

  if (password.contains(RegExp(r'[A-Z]'))) score += 1;
  else feedback.add('Password should contain at least one uppercase letter');

  if (password.contains(RegExp(r'[a-z]'))) score += 1;
  else feedback.add('Password should contain at least one lowercase letter');

  if (password.contains(RegExp(r'[0-9]'))) score += 1;
  else feedback.add('Password should contain at least one number');

  if (password.contains(RegExp(r'[!@#\$%^&*()_+\-=\[\]{}|;:,.<>?]'))) score += 1;
  else feedback.add('Password should contain at least one symbol');

  if (password.length >= 12) score += 1;
  if (password.length >= 16) score += 1;

  String strength;
  if (score <= 2) strength = 'Weak';
  else if (score <= 4) strength = 'Fair';
  else if (score <= 6) strength = 'Good';
  else strength = 'Strong';

  return {
    'score': score,
    'strength': strength,
    'feedback': feedback,
    'maxScore': 7,
  };
}