Module: CNPJ

Defined in:
lib/validates_as_cnpj/cnpj.rb

Constant Summary collapse

BLACK_LIST = 
%w(00000000000000 11111111111111 22222222222222 33333333333333
44444444444444 55555555555555 66666666666666 77777777777777
88888888888888 99999999999999)

Class Method Summary collapse

Class Method Details

.invalid?(cnpj) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/validates_as_cnpj/cnpj.rb', line 49

def self.invalid?(cnpj)
  !valid?(cnpj)
end

.valid?(cnpj) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/validates_as_cnpj/cnpj.rb', line 6

def self.valid?(cnpj)
  cnpj = cnpj.to_s

  # could be 13 or 14 digits or with mask 99.999.999/9999-99
  if cnpj !~ /^\d{13,14}|\d{2}\.\d{3}\.\d{3}\/\d{4}-\d{2}$/
    return false
  end

  cnpj = cnpj.scan(/\d/).collect(&:to_i)
  cnpj.unshift(0) if cnpj.length == 13

  # filter black list
  if BLACK_LIST.include? cnpj.join
    return false
  end

  # calculate first digit
  factor = [5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2]

  sum = (0..11).inject(0) do |sum, i|
    sum + cnpj[i] * factor[i]
  end

  result = sum % 11
  result = result < 2 ? 0 : 11 - result

  if result != cnpj[12]
    return false
  end

  # calculate second digit
  factor.unshift 6

  sum = (0..12).inject(0) do |sum, i|
    sum + cnpj[i] * factor[i]
  end

  result = sum % 11
  result = result < 2 ? 0 : 11 - result

  result == cnpj[13]
end