77 lines
2.4 KiB
Python
77 lines
2.4 KiB
Python
# onderwijsnummer.py - functions for handling onderwijsnummers
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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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"""Onderwijsnummer (the Dutch student identification number).
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The onderwijsnummers (education number) is very similar to the BSN (Dutch
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citizen identification number), but is for students without a BSN. It uses a
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checksum mechanism similar to the BSN.
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More information:
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* https://nl.wikipedia.org/wiki/Onderwijsnummer
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>>> validate('1012.22.331')
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'101222331'
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>>> validate('100252333')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('1012.22.3333')
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> validate('2112.22.337') # number must start with 10
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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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.nl.bsn import checksum, compact
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from stdnum.util import isdigits
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__all__ = ['compact', 'validate', 'is_valid']
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def validate(number: str) -> str:
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"""Check if the number is a valid onderwijsnummer. This checks the length
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and whether the check digit is correct and whether it starts with the
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right sequence."""
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number = compact(number)
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if not isdigits(number) or int(number) <= 0:
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raise InvalidFormat()
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if not number.startswith('10'):
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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 checksum(number) != 5:
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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 onderwijsnummer."""
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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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