Module: MxnBanks

Defined in:
lib/mxn_banks.rb,
lib/mxn_banks/bank.rb,
lib/mxn_banks/version.rb

Defined Under Namespace

Classes: Bank

Constant Summary collapse

VERSION = 
'0.1.6'

Class Method Summary collapse

Class Method Details

.current_control_digit(arr) ⇒ Object 



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# File 'lib/mxn_banks.rb', line 32

def self.current_control_digit(arr)
  module_sum = arr.reduce { |a, e| a + e }
  (10 - module_sum.modulo(10)).modulo(10)
end

.from_iban(num) ⇒ Object 



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# File 'lib/mxn_banks.rb', line 8

def self.from_iban(num)
  a = to_hash.select { |b| b[:number] == num.slice(0, 3) }
  fail ArgumentError, 'Invalid bank code' if a.empty?
  Bank.new(a.first)
end

.to_hash ⇒ Object 



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# File 'lib/mxn_banks.rb', line 14

def self.to_hash
  json_file = File.read(File.join(File.dirname(__FILE__), 'banks.json'))
  @banks ||= JSON.parse(json_file, symbolize_names: true)
end

.valid?(clabe) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mxn_banks.rb', line 19

def self.valid?(clabe)
  return false if clabe.length < 18
  sliced_clabe = clabe.slice(0, 17).split('')
  w_factor = weight(sliced_clabe)
  module_ten = sliced_clabe.map.with_index { |n, i| (n.to_i * w_factor[i]).modulo(10) }
  clabe.slice(-1).to_i == current_control_digit(module_ten)
end

.weight(clabe) ⇒ Object 



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# File 'lib/mxn_banks.rb', line 27

def self.weight(clabe)
  w_factor = { 0 => 3, 1 => 7, 2 => 1 }
  clabe.map.with_index { |_n, i| w_factor[i.to_i.modulo(3)] }
end