103 lines
3.1 KiB
Python
103 lines
3.1 KiB
Python
# amka.py - functions for handling Greek social security 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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"""AMKA (Αριθμός Μητρώου Κοινωνικής Ασφάλισης, Greek social security number).
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The Αριθμός Μητρώου Κοινωνικής Ασφάλισης (AMKA or Arithmos Mitroou Koinonikis
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Asfalisis) is the personal identifier that is used for social security
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purposes in Greece. The number consists of 11 digits and includes the
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person's date of birth and gender.
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More information:
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* https://www.amka.gr/tieinai_en.html
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>>> validate('01013099997')
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'01013099997'
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>>> validate('01013099999')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> get_birth_date('01013099997')
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datetime.date(1930, 1, 1)
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>>> get_gender('01013099997')
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'M'
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"""
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from __future__ import annotations
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import datetime
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from stdnum import luhn
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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 get_birth_date(number: str) -> datetime.date:
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"""Split the date parts from the number and return the date of birth.
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Since only two digits are used for the year, the century may be
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incorrect."""
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number = compact(number)
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day = int(number[0:2])
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month = int(number[2:4])
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year = int(number[4:6]) + 1900
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try:
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return datetime.date(year, month, day)
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except ValueError:
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try:
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return datetime.date(year + 100, month, day)
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except ValueError:
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raise InvalidComponent()
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def get_gender(number: str) -> str:
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"""Get the gender (M/F) from the person's AMKA."""
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number = compact(number)
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if int(number[9]) % 2:
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return 'M'
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else:
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return 'F'
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def validate(number: str) -> str:
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"""Check if the number is a valid AMKA. This checks the length,
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formatting 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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luhn.validate(number)
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get_birth_date(number)
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return number
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def is_valid(number: str) -> bool:
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"""Check if the number is a valid AMKA."""
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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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