Module: CreditCard

Included in:
Integer, String
Defined in:
lib/creditcard.rb

Overview

These functions tell you whether a credit card number is self-consistent using known algorithms for credit card numbers. All non-integer values are removed from the string before parsing so that you don’t have to worry about the format of the string.

Usage

require “creditcard”

“5276 4400 6542 1319”.creditcard?

> true

puts 5276440065421319.creditcard_type

> “mastercard”

“5276440065421319”.creditcard? “visa”

> false

“5276-4400-6542-1319”.creditcard? “mastercard”

> true

Ported from the Perl version by Jon Orwant and Ivan Kohler search.cpan.org/~ivan/Business-CreditCard-0.28/CreditCard.pm

Author

Lucas Carlson ([email protected])

Copyright

Copyright © 2005 Lucas Carlson

License

Distributes under the same terms as Ruby

Instance Method Summary collapse

Instance Method Details

#creditcard?(type = nil) ⇒ Boolean

Returns true if it validates. Optionally, you can pass a card type as an argument and make sure it is of the correct type.

References

Returns:

  • (Boolean) 


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# File 'lib/creditcard.rb', line 63

def creditcard?(type = nil)
	number = self.to_s.gsub(/[^\d]/, "")
	return false unless number.length >= 13
	
	if type
		return false unless creditcard_type == type
	end
	
	sum = 0
	for i in 0..number.length
		weight = number[-1*(i+2), 1].to_i * (2 - (i%2))
		sum += (weight < 10) ? weight : weight - 9
	end

	return true if number[-1,1].to_i == (10 - sum%10)%10
	return false
end

#creditcard_type ⇒ Object

Returns a string containing the type of card from the list of known information below.

Known card types

*Card Type* Prefix Length mastercard 51-55 16 visa 4 13, 16 american_express 34, 37 15 diners_club 300-305, 36, 38 14 enroute 2014, 2149 15 discover 6011 16 jcb 3 16 jcb 2131, 1800 15 bankcard 5610, 56022 16 switch various 16,18,19 solo 63, 6767 16,18,19



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# File 'lib/creditcard.rb', line 43

def creditcard_type
	number = self.to_s.gsub(/[^\d]/, "")
	
	return 'visa' if number =~ /^4\d{12}(\d{3})?$/
	return 'mastercard' if number =~ /^5[1-5]\d{14}$/
	return 'discover' if number =~ /^6011\d{12}$/
	return 'american_express' if number =~ /^3[47]\d{13}$/
	return 'diners_club' if number =~ /^3(0[0-5]|[68]\d)\d{11}$/
	return 'enroute' if number =~ /^2(014|149)\d{11}$/
	return 'jcb' if number =~ /^(3\d{4}|2131|1800)\d{11}$/
	return 'bankcard' if number =~ /^56(10\d\d|022[1-5])\d{10}$/
	return 'switch' if number =~ /^49(03(0[2-9]|3[5-9])|11(0[1-2]|7[4-9]|8[1-2])|36[0-9]{2})\d{10}(\d{2,3})?$/ || number =~ /^564182\d{10}(\d{2,3})?$/ || number =~ /^6(3(33[0-4][0-9])|759[0-9]{2})\d{10}(\d{2,3})?$/
	return 'solo' if number =~ /^6(3(34[5-9][0-9])|767[0-9]{2})\d{10}(\d{2,3})?$/
	return 'unknown'
end