84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
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# bsn.py - functions for handling BSNs
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#
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# Copyright (C) 2010, 2011, 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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"""BSN (Burgerservicenummer, Dutch national identification number).
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The BSN is a number with up to 9 digits (the leading 0's are commonly left
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out) which is used as the Dutch national identification number.
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>>> validate('1112.22.333')
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'111222333'
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>>> validate('1112.52.333')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('1112223334')
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> format('111222333')
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'1112.22.333'
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"""
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from stdnum.exceptions import *
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from stdnum.util import clean
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def compact(number):
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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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number = clean(number, ' -.').strip()
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# pad with leading zeroes
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return (9 - len(number)) * '0' + number
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def checksum(number):
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"""Calculate the checksum over the number. A valid number should have
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a check digit of 0."""
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return (sum((9 - i) * int(n) for i, n in enumerate(number[:-1])) -
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int(number[-1])) % 11
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def validate(number):
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"""Checks to see if the number provided is a valid BSN. This checks
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the length and whether the check digit is correct."""
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number = compact(number)
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if not number.isdigit() or int(number) <= 0:
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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) != 0:
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raise InvalidChecksum()
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid BSN. This checks
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the length and whether the check digit is correct."""
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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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def format(number):
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"""Reformat the passed number to the standard format."""
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number = compact(number)
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return number[:4] + '.' + number[4:6] + '.' + number[6:]
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