CreditCardValidations

Gem adds validator to check whether or not a given number actually falls within the ranges of possible numbers prior to performing such verification, and, as such, CreditCardValidations simply verifies that the credit card number provided is well-formed.

Installation

Add this line to your application's Gemfile:

gem 'credit_card_validations'

And then execute:

$ bundle

Or install it yourself as:

$ gem install credit_card_validations

Usage

The following issuing institutes are accepted:

name             | key
-----------------------
American Express | :amex
China UnionPay   | :unionpay
Dankrot          | :dankrot
Diners Club      | :diners
Dinner Club US   | :diners_us
Discover         | :discover
JCB              | :jcb
Laser            | :laser
Maestro          | :maestro
MasterCard       | :mastercard
Solo             | :solo
Visa             | :visa

Examples using string monkey patch

require 'credit_card_validations/string'
'5274 5763 9425 9961'.credit_card_brand
'5274 5763 9425 9961'.valid_credit_card_brand?(:mastercard, :visa)  
'5274 5763 9425 9961'.valid_credit_card_brand?(:amex)  

Examples using CreditCardValidations::Detector class

number = "4111111111111111"
detector = CreditCardValidations::Detector.new(number)
detector.brand #:visa
detector.visa? #true
detector.valid?(:mastercard,:maestro) #false
detector.valid?(:visa, :mastercard) #true
detector.issuer_category  #"Banking and financial"

Also You can add your own rules to detect other credit card brands/types passing name,length(integer/array of integers) and prefix(string/array of strings) Example

CreditCardValidations::Detector.add_rule(:voyager, 15, '86')
voyager_test_card_number = '869926275400212'
CreditCardValidations::Detector.new(voyager_test_card_number).brand #:voyager
CreditCardValidations::Detector.new(voyager_test_card_number).voyager? #true

Check luhn

CreditCardValidations::Detector.new(@credit_card_number).valid_luhn?

ActiveModel support

only for certain brads

class CreditCardModel
	attr_accessor :number
	include ActiveModel::Validations
	validates :number, credit_card_number: {brands: [:amex, :maestro]}
end

for all known brands

validates :number, presence: true, credit_card_number: true

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request