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//
// System.Web.Security.MembershipPasswordAttribute
//
// Authors:
// Martin Thwaites (github@my2cents.co.uk)
//
// (C) 2014 Martin Thwaites
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text.RegularExpressions;
namespace System.Web.Security
{
[AttributeUsageAttribute (AttributeTargets.Property|AttributeTargets.Field|AttributeTargets.Parameter, AllowMultiple = false)]
public class MembershipPasswordAttribute : ValidationAttribute
{
public string MinNonAlphanumericCharactersError { get; set; }
public string MinPasswordLengthError { get; set; }
public int MinRequiredNonAlphanumericCharacters { get; set; }
public int MinRequiredPasswordLength { get; set; }
public string PasswordStrengthError { get; set; }
public string PasswordStrengthRegularExpression { get; set; }
public Type ResourceType { get; set; }
public MembershipPasswordAttribute ()
{
if (Membership.Provider != null)
{
MinRequiredNonAlphanumericCharacters = Membership.Provider.MinRequiredNonAlphanumericCharacters;
MinRequiredPasswordLength = Membership.Provider.MinRequiredPasswordLength;
PasswordStrengthRegularExpression = Membership.Provider.PasswordStrengthRegularExpression;
}
else
{
MinRequiredPasswordLength = 7;
MinRequiredNonAlphanumericCharacters = 1;
PasswordStrengthRegularExpression = @"(?=.{6,})(?=(.*\d){1,})(?=(.*\W){1,})";
}
MinNonAlphanumericCharactersError = "The '{0}' field is an invalid password. Password must have {1} or more non-alphanumeric characters.";
MinPasswordLengthError = "The '{0}' field is an invalid password. Password must have {1} or more characters.";
PasswordStrengthError = "The '{0}' field is an invalid password. It does not meet the password strength requirements";
ErrorMessage = "The field {0} is invalid.";
}
protected override ValidationResult IsValid (object value, ValidationContext validationContext)
{
var password = value as string;
var isError = false;
if (string.IsNullOrEmpty(password))
return null;
var errorMessage = string.Empty;
var parameter = 0;
var pattern = new Regex (@"\W|_");
if (MinRequiredPasswordLength > 0 &&
password.Length < MinRequiredPasswordLength) {
errorMessage = MinPasswordLengthError;
parameter = MinRequiredPasswordLength;
isError = true;
}
if (!isError && MinRequiredNonAlphanumericCharacters > 0 &&
pattern.Matches (password).Count < MinRequiredNonAlphanumericCharacters) {
errorMessage = MinNonAlphanumericCharactersError;
parameter = MinRequiredNonAlphanumericCharacters;
isError = true;
}
if (!isError && !string.IsNullOrEmpty (PasswordStrengthRegularExpression) &&
new Regex (PasswordStrengthRegularExpression).IsMatch (password)) {
errorMessage = PasswordStrengthError;
isError = true;
}
if (isError) {
if (validationContext == null)
return new ValidationResult("error");
return new ValidationResult (
string.Format (errorMessage, validationContext.DisplayName, parameter),
new[] {validationContext.MemberName});
}
return ValidationResult.Success;
}
}
}
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