85 lines
2.7 KiB
Python
85 lines
2.7 KiB
Python
# nif.py - functions for handling Spanish NIF (VAT) numbers
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# coding: utf-8
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#
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# Copyright (C) 2012, 2013 Arthur de Jong
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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"""NIF (Número de Identificación Fiscal, Spanish VAT number).
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The Spanish VAT number is a 9-digit number where either the first, last
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digits or both can be letters.
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The number is either a DNI (Documento nacional de identidad, for
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Spaniards), a NIE (Número de Identificación de Extranjeros, for
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foreigners) or a CIF (Certificado de Identificación Fiscal, for legal
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entities and others).
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>>> compact('ES B-58378431')
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'B58378431'
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>>> validate('B64717838')
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'B64717838'
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>>> validate('B64717839') # invalid check digit
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('54362315K') # resident
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'54362315K'
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>>> validate('X-5253868-R') # foreign person
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'X5253868R'
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"""
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from stdnum.es import dni, nie, cif
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from stdnum.exceptions import *
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from stdnum.util import clean
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def compact(number):
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"""Convert the number to the minimal representation. This strips the
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number of any valid separators and removes surrounding whitespace."""
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number = clean(number, ' -').upper().strip()
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if number.startswith('ES'):
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number = number[2:]
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return number
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def validate(number):
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"""Checks to see if the number provided is a valid VAT number. This checks
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the length, formatting and check digit."""
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number = compact(number)
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if not number[1:-1].isdigit():
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raise InvalidFormat()
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if len(number) != 9:
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raise InvalidLength()
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if number[0].isdigit():
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# natural resident
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dni.validate(number)
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elif number[0] in 'XYZ':
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# foreign natural person
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nie.validate(number)
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else:
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# otherwise it has to be a valid CIF
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cif.validate(number)
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid VAT number. This checks
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the length, formatting and check digit."""
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try:
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return bool(validate(number))
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except ValidationError:
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return False
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