74 lines
2.5 KiB
Python
74 lines
2.5 KiB
Python
# asmens.py - functions for handling Lithuanian personal numbers
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# coding: utf-8
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#
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# Copyright (C) 2019 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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"""Asmens kodas (Lithuanian, personal numbers).
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The Asmens kodas consists of 11 digits. The first digits denotes the gender
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and birth century, the second through seventh denotes the birth date,
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followed by a three-digit serial and a check digit.
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More information:
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* https://lt.wikipedia.org/wiki/Asmens_kodas
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* https://en.wikipedia.org/wiki/National_identification_number#Lithuania
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>>> validate('33309240064')
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'33309240064'
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>>> validate('33309240164')
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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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from stdnum.ee.ik import calc_check_digit, get_birth_date
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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, validate_birth_date: bool = True) -> str:
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"""Check if the number provided is valid. This checks the length,
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formatting, embedded date and 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) != 11:
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raise InvalidLength()
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if validate_birth_date and number[0] != '9':
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get_birth_date(number)
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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, validate_birth_date: bool = True) -> bool:
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"""Check if the number provided is valid. This checks the length,
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formatting, embedded date and check digit."""
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try:
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return bool(validate(number, validate_birth_date))
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except ValidationError:
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return False
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