94 lines
3.2 KiB
Python
94 lines
3.2 KiB
Python
# maticna.py - functions for handling Slovenian Corporate Registration Numbers
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# coding: utf-8
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#
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# Copyright (C) 2023 Blaž Bregar
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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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"""Matična številka poslovnega registra (Corporate Registration Number)
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The Corporate registration number represent a unique identification of
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each unit of the business register, assigned by the registry administrator
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at the time of entry in the business register, which shall not be changed.
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The number consists of 7 or 10 digits and includes a check digit. The first 6
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digits represent a unique number for each unit or company, followed by a
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check digit. The last 3 digits represent an additional business unit of the
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company, starting at 001. When a company consists of more than 1000 units, a
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letter is used instead of the first digit in the business unit. Unit 000
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always represents the main registered address.
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More information:
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* https://pisrs.si/pregledPredpisa?id=URED7599
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>>> validate('9331310000')
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'9331310'
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>>> validate('9331320000')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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"""
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from __future__ import annotations
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import re
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from stdnum.exceptions import *
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from stdnum.util import clean, isdigits
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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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number = clean(number, '. ').strip().upper()
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if len(number) == 10 and number.endswith('000'):
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number = number[0:7]
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return number
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def calc_check_digit(number: str) -> str:
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"""Calculate the check digit."""
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weights = (7, 6, 5, 4, 3, 2)
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total = sum(int(n) * w for n, w in zip(number, weights))
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remainder = -total % 11
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if remainder == 0:
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return 'invalid' # invalid remainder
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return str(remainder % 10)
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def validate(number: str) -> str:
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"""Check if the number is a valid Corporate Registration number. This
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checks the length and check digit."""
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number = compact(number)
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if len(number) not in (7, 10):
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raise InvalidLength()
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if not isdigits(number[:6]):
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raise InvalidFormat()
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if not re.match(r'^([A-Za-z0-9]\d{2})?$', number[7:]):
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raise InvalidFormat()
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if calc_check_digit(number) != number[6]:
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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 provided is valid ID. This checks the length,
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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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