2 // CreditCardAttribute.cs
5 // Marek Safar <marek.safar@gmail.com>
6 // Pablo Ruiz García <pablo.ruiz@gmail.com>
8 // Copyright (C) 2013 Xamarin Inc (http://www.xamarin.com)
9 // Copyright (C) 2013 Pablo Ruiz García
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35 using System.Globalization;
37 namespace System.ComponentModel.DataAnnotations
39 [AttributeUsageAttribute (AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
40 public class CreditCardAttribute : DataTypeAttribute
42 private const string DefaultErrorMessage = "The {0} field is not a valid credit card number.";
44 public CreditCardAttribute ()
45 : base(DataType.CreditCard)
47 // XXX: There is no .ctor accepting Func<string> on DataTypeAttribute.. :?
48 base.ErrorMessage = DefaultErrorMessage;
51 public override bool IsValid(object value)
56 if (string.IsNullOrEmpty(value as string))
59 // Remove any invalid characters..
60 var creditCardNumber = (value as string).Replace("-", "").Replace(" ", "");
62 if (creditCardNumber.Any (x => !Char.IsDigit (x)))
65 // Performan a Luhn-based check against credit card number.
67 // See: http://en.wikipedia.org/wiki/Luhn_algorithm
68 // See: http://rosettacode.org/wiki/Luhn_test_of_credit_card_numbers