75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
# veronumero.py - functions for handling Finnish individual tax numbers
|
|
# coding: utf-8
|
|
#
|
|
# Copyright (C) 2017 Holvi Payment Services Oy
|
|
# 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
|
|
|
|
"""
|
|
Veronumero (Finnish individual tax number).
|
|
|
|
The Veronumero an individual tax number that is assigned to workers in the
|
|
construction industry in Finland. The number is separate from the HETU and is
|
|
a 12 digit number without any embedded information such as birth dates.
|
|
|
|
More information:
|
|
|
|
* https://www.vero.fi/en/detailed-guidance/guidance/48791/individual_tax_numbers__instructions_fo/
|
|
* https://prosentti.vero.fi/Veronumerorekisteri/Tarkistus/VeronumeronTarkistus.aspx
|
|
|
|
>>> validate('123456789123')
|
|
'123456789123'
|
|
>>> validate('12345678912A')
|
|
Traceback (most recent call last):
|
|
...
|
|
InvalidFormat: ...
|
|
>>> validate('123456789')
|
|
Traceback (most recent call last):
|
|
...
|
|
InvalidLength: ...
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
from stdnum.exceptions import *
|
|
from stdnum.util import clean, isdigits
|
|
|
|
|
|
def compact(number: str) -> str:
|
|
"""Convert the Veronumero to the minimal representation. This strips
|
|
surrounding whitespace and removes separators."""
|
|
return clean(number, ' ').strip()
|
|
|
|
|
|
def validate(number: str) -> str:
|
|
"""Check if the number is a valid tax number. This checks the length and
|
|
formatting."""
|
|
number = compact(number)
|
|
if not isdigits(number):
|
|
raise InvalidFormat()
|
|
if len(number) != 12:
|
|
raise InvalidLength()
|
|
# there is no known check digit validation
|
|
return number
|
|
|
|
|
|
def is_valid(number: str) -> bool:
|
|
"""Check if the number is a valid tax number."""
|
|
try:
|
|
return bool(validate(number))
|
|
except ValidationError:
|
|
return False
|