public ValidationResult Validate(User record)
{
var validationResult = new UserPasswordValidationResult();
AnaliseErrors(validationResult, record, record.Password);
AnaliseWarnings(validationResult, record, record.Password);
if (validationResult.score() < 3)
{
validationResult.errors.Add(Error.TOO_WEAK);
}
return(validationResult);
}
private void AnaliseWarnings(UserPasswordValidationResult validationResult, User user, string password)
{
// Check for 4+ digits sum or subtraction sequences (1234, 2468, 4321, etc)
var regexp = new Regex("\\d{4,}"); // Finds 4+ digits toghether
var finded = regexp.Match(password);
var valid = true;
if (finded.Success)
{
var digits = finded.Value;
var deltas = new List <int>();
for (var i = 0; i < (digits.Length - 1); i++)
{
// Delta betwen two digits
deltas.Add(int.Parse(digits[i + 1].ToString()) - int.Parse(digits[i].ToString()));
}
// Check for 3 equal deltas (4 digits -> 3 deltas)
for (var i = 0; i < (deltas.Count - 2); i++)
{
if (deltas.ElementAt(i) == deltas.ElementAt(i + 1) && deltas.ElementAt(i) == deltas.ElementAt(i + 2))
{
valid = false;
break;
}
}
}
if (valid)
{
validationResult.warnings.Remove(Warning.SEQUENCIAL_NUMBERS);
}
var letterCount = 0;
var digitCount = 0;
foreach (var c in password)
{
if (char.IsLetter(c))
{
letterCount++;
}
if (char.IsDigit(c))
{
digitCount++;
}
}
if (letterCount > 2)
{
validationResult.warnings.Remove(Warning.ONLY_TWO_LETTERS);
}
if (digitCount > 2)
{
validationResult.warnings.Remove(Warning.ONLY_TWO_NUMBERS);
}
var userCode = user.Id;
if (userCode == null || (!password.ToLower().Contains(userCode.ToLower())))
{
validationResult.warnings.Remove(Warning.CONTAINS_USER_CODE);
}
var firstName = user.FirstName();
if (firstName == null || (!password.ToLower().Contains(firstName.ToLower())))
{
validationResult.warnings.Remove(Warning.CONTAINS_NAME);
}
var userInitials = user.NameInitials();
if (userInitials == null || (!password.ToUpper().Contains(userInitials)))
{
validationResult.warnings.Remove(Warning.CONTAINS_NAME_INITIALS);
}
if (user.BirthDate != DateTime.MinValue)
{
var birthDateStr = user.BirthDate.ToString("ddMMyyyy");
if (!password.Contains(birthDateStr))
{
validationResult.warnings.Remove(Warning.CONTAINS_FULL_BIRTH_DATE);
birthDateStr = user.BirthDate.ToString("ddMM");
if (!password.Contains(birthDateStr))
{
validationResult.warnings.Remove(Warning.CONTAINS_DAY_AND_MONTH_OF_BIRTH_DATE);
}
}
else
{
validationResult.warnings.Remove(Warning.CONTAINS_DAY_AND_MONTH_OF_BIRTH_DATE);
}
birthDateStr = user.BirthDate.ToString("yyyyMMdd");
if (!password.Contains(birthDateStr))
{
validationResult.warnings.Remove(Warning.CONTAINS_REVERSE_FULL_BIRTH_DATE);
birthDateStr = user.BirthDate.ToString("MMdd");
if (!password.Contains(birthDateStr))
{
validationResult.warnings.Remove(Warning.CONTAINS_REVERSE_DAY_AND_MONTH_OF_BIRTH_DATE);
}
}
else
{
validationResult.warnings.Remove(Warning.CONTAINS_REVERSE_DAY_AND_MONTH_OF_BIRTH_DATE);
}
}
else
{
validationResult.warnings.Remove(Warning.CONTAINS_FULL_BIRTH_DATE);
validationResult.warnings.Remove(Warning.CONTAINS_DAY_AND_MONTH_OF_BIRTH_DATE);
validationResult.warnings.Remove(Warning.CONTAINS_REVERSE_FULL_BIRTH_DATE);
validationResult.warnings.Remove(Warning.CONTAINS_REVERSE_DAY_AND_MONTH_OF_BIRTH_DATE);
}
}
private void AnaliseErrors(UserPasswordValidationResult validationResult, User user, string password)
{
if (password.Length < 6)
{
validationResult.errors.Add(Error.TOO_SHORT);
}
if (password.Length > 10)
{
validationResult.errors.Add(Error.TOO_LONG);
}
bool hasLowerCase = false;
bool hasUpperCase = false;
foreach (var key in password)
{
hasLowerCase |= char.IsLetter(key) && char.IsLower(key);
hasUpperCase |= char.IsLetter(key) && char.IsUpper(key);
if (hasLowerCase && hasUpperCase)
{
break;
}
}
if (!(hasLowerCase && hasUpperCase))
{
validationResult.errors.Add(Error.NO_DISTINC_CASES);
}
foreach (var key in password)
{
if (char.IsWhiteSpace(key))
{
validationResult.errors.Add(Error.SPACES);
break;
}
}
var acceptableRegexp = new Regex(@"\A[A-Za-z0-9\s]*\Z");
if (!acceptableRegexp.Match(password).Success)
{
validationResult.errors.Add(Error.SPECIAL_CHARS);
}
foreach (var key in password)
{
if (char.IsNumber(key) && password.Contains(new String(key, 3)))
{
validationResult.errors.Add(Error.REPEATED_NUMBERS);
break;
}
}
var lowerPassword = password.ToLower();
foreach (var key in lowerPassword)
{
if (char.IsLetter(key) && lowerPassword.Contains(new String(key, 3)))
{
validationResult.errors.Add(Error.REPEATED_LETTERS);
break;
}
}
var numberCount = 0;
var letterCount = 0;
foreach (var key in password)
{
if (char.IsLetter(key))
{
letterCount++;
}
if (char.IsNumber(key))
{
numberCount++;
}
}
if (numberCount < 2)
{
validationResult.errors.Add(Error.TOO_FEW_NUMBERS);
}
if (letterCount < 2)
{
validationResult.errors.Add(Error.TOO_FEW_LETTERS);
}
if (password.Equals(user.OldPassword))
{
validationResult.errors.Add(Error.EQUALS_PREVIOUS_PASSWORD);
}
if (password.Equals(user.Id))
{
validationResult.errors.Add(Error.EQUALS_USER_CODE);
}
}
