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# vnr.py - functions for handling Austrian social security numbers
# coding: utf-8
#
# Copyright (C) 2018 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
"""VNR, SVNR, VSNR (Versicherungsnummer, Austrian social security number).
The Austian Versicherungsnummer is a personal identification number used for
social security. The number is 10 digits long and consists of a 3 digit
serial, a check digit and 6 digits that usually specify the person's birth
date.
More information:
* https://de.wikipedia.org/wiki/Sozialversicherungsnummer#Österreich
>>> validate('1237 010180')
'1237010180'
>>> validate('2237 010180')
Traceback (most recent call last):
...
InvalidChecksum: ...
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' ')
def calc_check_digit(number):
"""Calculate the check digit. The fourth digit in the number is
ignored."""
weights = (3, 7, 9, 0, 5, 8, 4, 2, 1, 6)
return str(sum(w * int(n) for w, n in zip(weights, number)) % 11)
def validate(number):
"""Check if the number is a valid VAT number. This checks the length,
formatting and check digit."""
number = compact(number)
if not isdigits(number) or number.startswith('0'):
raise InvalidFormat()
if len(number) != 10:
raise InvalidLength()
if calc_check_digit(number) != number[3]:
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid VAT number."""
try:
return bool(validate(number))
except ValidationError:
return False
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