96 lines
3.2 KiB
Python
96 lines
3.2 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 Extranjero, for
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foreigners) or a CIF (Código 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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>>> validate('M-1234567-L') # foreign person without NIE
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'M1234567L'
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"""
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from __future__ import annotations
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from stdnum.es import cif, dni, nie
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from stdnum.exceptions import *
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from stdnum.util import clean, isdigits
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def compact(number: str) -> str:
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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: str) -> str:
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"""Check if the number provided is a valid VAT number. This checks the
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length, formatting and check digit."""
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number = compact(number)
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if not isdigits(number[1:-1]):
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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] in 'KLM':
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# K: Spanish younger than 14 year old
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# L: Spanish living outside Spain without DNI
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# M: granted the tax to foreigners who have no NIE
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# these use the old checkdigit algorithm (the DNI one)
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if number[-1] != dni.calc_check_digit(number[1:-1]):
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raise InvalidChecksum()
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elif isdigits(number[0]):
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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: str) -> bool:
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"""Check if the number provided is a valid VAT number. This checks the
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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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