/// <summary>
/// Runs credit card details through a series of checks, returning a collection of field-level errors.
/// </summary>
/// <param name="configuration">AppConfigs and similar configuration.</param>
/// <param name="context">Credit card details to be validated.</param>
/// <returns>A <see cref="CreditCardValidationResult"/> containing any validation errors.</returns>
public CreditCardValidationResult ValidateCreditCard(CreditCardValidationConfiguration configuration, CreditCardValidationContext context)
{
var fieldErrors = ValidateFields(configuration, context);
return(new CreditCardValidationResult(
valid: !fieldErrors.Any(),
fieldErrors: fieldErrors.ToLookup(
kvp => kvp.Key,
kvp => kvp.Value)));
}
IEnumerable <KeyValuePair <CreditCardValidationField, string> > ValidateFields(CreditCardValidationConfiguration configuration, CreditCardValidationContext context)
{
var acceptedCardType = CreditCardTypeProvider
.GetAcceptedCreditCardTypes()
.Contains(context.CardType, StringComparer.OrdinalIgnoreCase);
if (!acceptedCardType)
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.CardType, AppLogic.GetString("creditCardDetails.cardType.invalid")));
}
var missingRequiredIssueNumber =
CreditCardTypeProvider
.GetCardTypesRequiringIssueNumber()
.Contains(context.CardType, StringComparer.OrdinalIgnoreCase) &&
string.IsNullOrEmpty(context.IssueNumber);
if (missingRequiredIssueNumber)
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.IssueNumber, AppLogic.GetString("creditCardDetails.cardIssueNumber.required")));
}
if (configuration.ValidateCreditCardNumber)
{
var cardType = CardType.Parse(context.CardType);
if (cardType != null) // Only validate known card types
{
var creditCardValidator = new CreditCardValidator(context.Number, cardType);
if (!creditCardValidator.Validate())
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.Number, AppLogic.GetString("creditCardDetails.cardNumber.format")));
}
}
}
var missingExpirationDate = context.ExpirationDate == null;
if (missingExpirationDate)
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.ExpirationDate, AppLogic.GetString("creditCardDetails.cardExpirationDate.required")));
}
var missingRequiredCardExtraCode =
!configuration.CardExtraCodeIsOptional &&
string.IsNullOrEmpty(context.Cvv);
if (missingRequiredCardExtraCode)
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.Cvv, AppLogic.GetString("address.cs.29")));
}
}
IEnumerable <KeyValuePair <CreditCardValidationField, string> > ValidateFields(CreditCardValidationConfiguration configuration, CreditCardValidationContext context)
{
var acceptedCardType = CreditCardTypeProvider
.GetAcceptedCreditCardTypes()
.Contains(context.CardType, StringComparer.OrdinalIgnoreCase);
if (!acceptedCardType)
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.CardType, "Invalid card type"));
}
var missingRequiredIssueNumber =
CreditCardTypeProvider
.GetCardTypesRequiringIssueNumber()
.Contains(context.CardType, StringComparer.OrdinalIgnoreCase) &&
string.IsNullOrEmpty(context.IssueNumber);
if (missingRequiredIssueNumber)
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.IssueNumber, "Please enter a card issue number"));
}
if (configuration.ValidateCreditCardNumber)
{
var cardType = CardType.Parse(context.CardType);
if (cardType != null) // Only validate known card types
{
var creditCardValidator = new CreditCardValidator(context.Number, cardType);
if (!creditCardValidator.Validate())
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.Number, "Please enter a valid credit card number"));
}
}
}
var missingExpirationDate = context.ExpirationDate == null;
if (missingExpirationDate)
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.ExpirationDate, "Card expiration date is missing or invalid"));
}
var missingRequiredCardExtraCode =
!configuration.CardExtraCodeIsOptional &&
string.IsNullOrEmpty(context.Cvv);
if (missingRequiredCardExtraCode)
{
yield return(new KeyValuePair <CreditCardValidationField, string>(CreditCardValidationField.Cvv, "Please enter the credit card verification code with no spaces. This number can be found printed on the back side of your card"));
}
}
