109 lines
3.7 KiB
Python
109 lines
3.7 KiB
Python
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# cif.py - functions for handling Spanish fiscal 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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"""CIF (Certificado de Identificación Fiscal, Spanish company tax number).
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The CIF is a tax identification number for legal entities. It has 9 digits
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where the first digit is a letter (denoting the type of entity) and the
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last is a check digit (which may also be a letter).
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>>> validate('J99216582')
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'J99216582'
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>>> validate('J99216583') # 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('J992165831') # too long
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> validate('M-1234567-L')
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'M1234567L'
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>>> validate('O-1234567-L') # invalid first character
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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>>> split('A13 585 625')
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('A', '13', '58562', '5')
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"""
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from stdnum import luhn
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from stdnum.es import dni
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from stdnum.exceptions import *
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__all__ = ['compact', 'validate', 'is_valid', 'split']
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# use the same compact function as DNI
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compact = dni.compact
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def calc_check_digits(number):
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"""Calculate the check digits for the specified number. The number
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passed should not have the check digit included. This function returns
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both the number and character check digit candidates."""
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check = luhn.calc_check_digit(number[1:])
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return check + 'JABCDEFGHI'[int(check)]
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def validate(number):
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"""Checks to see if the number provided is a valid DNI number. This
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checks 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] 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 number[0] in 'ABCDEFGHJNPQRSUVW':
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# there seems to be conflicting information on which organisation types
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# should have which type of check digit (alphabetic or numeric) so
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# we support either here
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if number[-1] not in calc_check_digits(number[:-1]):
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raise InvalidChecksum()
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else:
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# anything else is invalid
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raise InvalidFormat()
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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 DNI number. This
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checks 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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def split(number):
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"""Split the provided number into a letter to define the type of
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organisation, two digits that specify a province, a 5 digit sequence
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number within the province and a check digit."""
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number = compact(number)
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return number[0], number[1:3], number[3:8], number[8:]
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