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# nie.py - functions for handling Spanish foreigner identity codes
# coding: utf-8
#
# Copyright (C) 2012, 2013 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""NIE (Número de Identificación de Extranjeros, Spanish foreigner number).
The NIE is an identification number for foreigners. It is a 9 digit number
where the first digit is either X, Y or Z and last digit is a checksum
letter.
>>> validate('x-2482300w')
'X2482300W'
>>> validate('x-2482300a') # invalid check digit
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('X2482300') # digit missing
Traceback (most recent call last):
...
InvalidLength: ...
"""
from stdnum.es import dni
from stdnum.exceptions import *
__all__ = ['compact', 'is_valid']
# use the same compact function as DNI
compact = dni.compact
def calc_check_digit(number):
"""Calculate the check digit. The number passed should not have the
check digit included."""
# replace XYZ with 012
number = str('XYZ'.index(number[0])) + number[1:]
return dni.calc_check_digit(number)
def validate(number):
"""Checks to see if the number provided is a valid NIE. This checks
the length, formatting and check digit."""
number = compact(number)
if not number[1:-1].isdigit() or number[:1] not in 'XYZ':
raise InvalidFormat()
if len(number) != 9:
raise InvalidLength()
if calc_check_digit(number[:-1]) != number[-1]:
raise InvalidChecksum()
return number
def is_valid(number):
"""Checks to see if the number provided is a valid NIE. This checks
the length, formatting and check digit."""
try:
return bool(validate(number))
except ValidationError:
return False
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