73 lines
2.3 KiB
Python
73 lines
2.3 KiB
Python
# mva.py - functions for handling Norwegian VAT numbers
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# coding: utf-8
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#
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# Copyright (C) 2015 Tuomas Toivonen
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# Copyright (C) 2015 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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"""MVA (Merverdiavgift, Norwegian VAT number).
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The VAT number is the standard Norwegian organisation number
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(Organisasjonsnummer) with 'MVA' as suffix.
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>>> validate('NO 995 525 828 MVA')
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'995525828MVA'
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>>> validate('NO 995 525 829 MVA')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> format('995525828MVA')
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'NO 995 525 828 MVA'
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"""
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from stdnum.exceptions import *
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from stdnum.no import orgnr
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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, ' ').upper().strip()
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if number.startswith('NO'):
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number = number[2:]
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return number
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def validate(number):
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"""Checks to see if the number provided is a valid MVA number. This
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checks the length, formatting and check digit."""
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number = compact(number)
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if not number.endswith('MVA'):
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raise InvalidFormat()
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orgnr.validate(number[:-3])
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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 MVA number. This
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checks the length, formatting and check digit."""
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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 'NO ' + orgnr.format(number[:9]) + ' ' + number[9:]
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