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