Credit card validation

[jnordberg]

Credit card validation is one of those things where regex does not quite cut it. joi.string().creditcard() perhaps?

References:

http://en.wikipedia.org/wiki/Luhn_algorithm
http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=39698

[arb]

How do you envision this working? Is the use case "Make sure this number is really a Visa" or is it more along the lines of "Is the number a real credit card number"?

[jnordberg]

I was initially just thinking a luhn check on the card number string. But maybe allowing the .creditcard() to accept an optional array of valid card types could be useful.

https://github.com/observing/creditcard/blob/master/docs/README.md

[hueniverse]

I will take a simple and dependency free pull request, but this is such a special case feature that I don't want to go out of my way to support it. There is so much more to validating CCs.

[Marsup]

Fixed by #469.

[lock]

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