85 lines
2.7 KiB
Python
85 lines
2.7 KiB
Python
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# registrikood.py - functions for handling the Estonian Registrikood
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# coding: utf-8
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#
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# Copyright (C) 2017 Holvi Payment Services
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# Copyright (C) 2017 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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"""Registrikood (Estonian organisation registration code).
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All organisations are assigned a unique tax identification code from the
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commercial register, from the state register or from the non-profit
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associations and foundations register. The code consists of 8 digits.
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Commercial company numbers start with a 1, schools and government numbers
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with a 7, non-profit organisations with an 8 and foundations with a 9. The
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number uses the same check digit algorithm as the Isikukood although that
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fact is undocumented.
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More information:
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* https://ariregister.rik.ee/
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* https://mtr.mkm.ee/
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>>> validate('12345678')
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'12345678'
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>>> validate('12345679')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('32345674')
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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"""
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from __future__ import annotations
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from stdnum.ee.ik import calc_check_digit
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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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return clean(number, ' ').strip()
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def validate(number: str) -> str:
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"""Check if the number provided is valid. This checks the length and
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check digit."""
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number = compact(number)
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if not isdigits(number):
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raise InvalidFormat()
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if len(number) != 8:
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raise InvalidLength()
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if number[0] not in '1789':
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raise InvalidComponent()
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if number[-1] != calc_check_digit(number):
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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 the number provided is valid. This checks the length and
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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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