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Forked from juanyque/validate_spanish_vat.rb
Created March 3, 2017 10:41
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module ValidateSpanishVat
module ClassMethods
# Implements model level validator for Spanish's VAT number.
# Usage:
#
# Inside a model with a vat field, simply put
#
# validates_spanish_vat field_name
#
def validates_spanish_vat(*attr_names)
configuration = { :message => :invalid, :on => :save }
configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash)
validates_each(attr_names, configuration) do |record, attr_name, value|
record.errors.add(attr_name, configuration[:message]) unless CustomValidator::SpanishVAT.validate(value)
end
end
end
end
module CustomValidator
class SpanishVAT
# Main validate function, it runs several regexp's to determine if value is a nif, cif or nie.
# If so, it runs specific test, else fails
def self.validate(model_value)
return false if model_value.nil?
value = model_value.clone
case
when value.match(/[0-9]{8}[a-z]/i)
return validate_nif(value)
when value.match(/[a-wyz][0-9]{7}[0-9a-z]/i)
return validate_cif(value)
when value.match(/[x][0-9]{7,8}[a-z]/i)
return validate_nie(value)
end
return false
end
# Validates NIF
def self.validate_nif(value)
letters = "TRWAGMYFPDXBNJZSQVHLCKE"
check = value.slice!(value.length - 1..value.length - 1).upcase
calculated_letter = letters[value.to_i % 23].chr
return check === calculated_letter
end
# Validates CIF
def self.validate_cif(value)
letter = value.slice!(0).chr.upcase
check = value.slice!(value.length - 1).chr.upcase
n1 = n2 = 0
for idx in 0..value.length - 1
number = value.slice!(0).chr.to_i
if (idx % 2) != 0
n1 += number
else
n2 += ((2*number) % 10) + ((2 * number) / 10)
end
end
calculated_number = (10 - ((n1 + n2) % 10)) % 10
calculated_letter = (64 + calculated_number).chr
if letter.match(/[QPNSW]/)
return check.to_s == calculated_letter.to_s
else
return check.to_i == calculated_number.to_i
end
end
# Validates NIE, in fact is a fake, a NIE is really a NIF with first number changed to capital 'X' letter, so we change the first X to a 0 and then try to
# pass the nif validator
def self.validate_nie(value)
value[0] = '0'
value.slice(0) if value.size > 9
validate_nif(value)
end
end
end
require File.expand_path(File.join(File.dirname(__FILE__), '../lib/validate_spanish_vat.rb'))
require 'test/unit'
class ValidateSpanishVatTest < Test::Unit::TestCase
def test_validate_nif
assert CustomValidator::SpanishVAT.validate('00000000T') # Correct NIF
assert !CustomValidator::SpanishVAT.validate('00000000L') # Incorrect NIF
end
def test_validate_nie
assert CustomValidator::SpanishVAT.validate('X0000000T') # Correct NIE
assert !CustomValidator::SpanishVAT.validate('X0000000L') # Incorrect NIE
assert CustomValidator::SpanishVAT.validate('X00000000T') # Correct NIE
assert !CustomValidator::SpanishVAT.validate('X00000000L') # Incorrect NIE
end
def test_validate_cif
assert CustomValidator::SpanishVAT.validate('B25630633') # Correct CIF
assert !CustomValidator::SpanishVAT.validate('B25630634') # Incorrect CIF
assert CustomValidator::SpanishVAT.validate('Q5355054G') # Correct CIF
assert !CustomValidator::SpanishVAT.validate('Q5355054R') # Incorrect CIF
assert CustomValidator::SpanishVAT.validate('W0042192E') # Correct CIF
assert !CustomValidator::SpanishVAT.validate('W0042192Z') # Incorrect CIF
end
end
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