83 lines
2.7 KiB
Python
83 lines
2.7 KiB
Python
# ssn.py - functions for handling Swiss social security numbers
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#
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# Copyright (C) 2014 Denis Krienbuehl
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# Copyright (C) 2016 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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"""Swiss social security number ("Sozialversicherungsnummer").
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Also known as "Neue AHV Nummer". The Swiss Sozialversicherungsnummer is used
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to identify individuals for taxation and pension purposes.
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The number is validated using EAN-13, though dashes are substituted for dots.
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More information:
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* https://en.wikipedia.org/wiki/National_identification_number#Switzerland
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* https://de.wikipedia.org/wiki/Sozialversicherungsnummer#Versichertennummer
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>>> validate('7569217076985')
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'7569217076985'
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>>> validate('756.9217.0769.85')
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'7569217076985'
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>>> validate('756.9217.0769.84')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('123.4567.8910.19')
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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>>> format('7569217076985')
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'756.9217.0769.85'
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"""
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from __future__ import annotations
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from stdnum import ean
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from stdnum.exceptions import *
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from stdnum.util import clean
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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, ' .').strip()
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def format(number: str) -> str:
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"""Reformat the number to the standard presentation format."""
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number = compact(number)
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return '.'.join((number[:3], number[3:7], number[7:11], number[11:]))
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def validate(number: str) -> str:
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"""Check if the number is a valid Swiss Sozialversicherungsnummer."""
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number = compact(number)
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if len(number) != 13:
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raise InvalidLength()
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if not number.startswith('756'):
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raise InvalidComponent()
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return ean.validate(number)
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def is_valid(number: str) -> bool:
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"""Check if the number is a valid Swiss Sozialversicherungsnummer."""
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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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