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# ogrn.py - functions for handling Russian company registration numbers
# coding: utf-8
#
# Copyright (C) 2024 Ivan Stavropoltsev
# Copyright (C) 2025 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""ОГРН, OGRN, PSRN, ОГРНИП, OGRNIP (Russian Primary State Registration Number).
The ОГРН (Основной государственный регистрационный номер, Primary State
Registration Number) is a Russian identifier for legal entities. The number
consists of 13 or 15 digits and includes information on the type of
organisation, the registration year and a tax inspection code. The 15 digit
variant is called ОГРНИП (Основной государственный регистрационный номер
индивидуального предпринимателя, Primary State Registration Number of an
Individual Entrepreneur).
More information:
* https://ru.wikipedia.org/wiki/Основной_государственный_регистрационный_номер
* https://ru.wikipedia.org/wiki/Основной_государственный_регистрационный_номер_индивидуального_предпринимателя
>>> validate('1022200525819')
'1022200525819'
>>> validate('385768585948949')
'385768585948949'
>>> validate('1022500001328')
Traceback (most recent call last):
...
InvalidChecksum: ...
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' ')
def calc_check_digit(number):
"""Calculate the control digit of the OGRN based on its length."""
if len(number) == 13:
return str(int(number[:-1]) % 11 % 10)
else:
return str(int(number[:-1]) % 13)
def validate(number):
"""Determine if the given number is a valid OGRN."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) == 13:
if number[0] == '0':
raise InvalidComponent()
elif len(number) == 15:
if number[0] not in '34':
raise InvalidComponent()
else:
raise InvalidLength()
if number[-1] != calc_check_digit(number):
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid OGRN."""
try:
return bool(validate(number))
except ValidationError:
return False
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