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