82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
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# cf.py - functions for handling Romanian CF (VAT) numbers
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# coding: utf-8
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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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"""CF (Cod de înregistrare în scopuri de TVA, Romanian VAT number).
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The Romanian CF is used for VAT purposes and can be from 2 to 10 digits long.
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>>> validate('RO 185 472 90')
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'18547290'
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>>> validate('185 472 91')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('1630615123457') # personal code
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'1630615123457'
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"""
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from stdnum.exceptions import *
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from stdnum.ro import cnp
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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('RO'):
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number = number[2:]
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return number
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def calc_check_digit(number):
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"""Calculate the check digit for organisations. The number passed
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should not have the check digit included."""
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weights = (7, 5, 3, 2, 1, 7, 5, 3, 2)
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number = (9 - len(number)) * '0' + number
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check = 10 * sum(weights[i] * int(n) for i, n in enumerate(number))
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return str(check % 11 % 10)
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def validate(number):
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"""Checks to see if the number provided is a valid VAT 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.isdigit() or number[0] == '0':
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raise InvalidFormat()
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if len(number) == 13:
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# apparently a CNP can also be used (however, not all sources agree)
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cnp.validate(number)
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elif 2 <= len(number) <= 10:
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if calc_check_digit(number[:-1]) != number[-1]:
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raise InvalidChecksum()
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else:
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raise InvalidLength()
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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 VAT 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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