113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
# ik.py - functions for handling Estonian Personal ID numbers (IK)
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# coding: utf-8
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#
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# Copyright (C) 2015 Tomas Karasek
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# Copyright (C) 2015 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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"""Isikukood (Estonian Personcal ID number).
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The number consists of 11 digits: the first indicates the gender and century
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the person was born in, the following 6 digits the birth date, followed by a
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3 digit serial and a check digit.
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>>> validate('36805280109')
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'36805280109'
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>>> validate('36805280108') # incorrect check digit
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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('36805280109')
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datetime.date(1968, 5, 28)
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"""
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import datetime
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from stdnum.util import clean
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from stdnum.exceptions import *
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def compact(number):
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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):
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"""Split the date parts from the number and return the birth date."""
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number = compact(number)
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if number[0] in '12':
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century = 1800
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elif number[0] in '34':
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century = 1900
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elif number[0] in '56':
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century = 2000
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elif number[0] in '78':
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century = 2100
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else:
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raise InvalidComponent()
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year = century + int(number[1:3])
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month = int(number[3:5])
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day = int(number[5:7])
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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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raise InvalidComponent()
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def get_gender(number):
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"""Get the person's birth gender ('M' or 'F')."""
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number = compact(number)
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if number[0] in '1357':
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return 'M'
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elif number[0] in '2468':
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return 'F'
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else:
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raise InvalidComponent()
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def calc_check_digit(number):
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"""Calculate the check digit."""
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check = sum(((i % 9) + 1) * int(n)
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for i, n in enumerate(number[:-1])) % 11
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if check == 10:
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check = sum((((i + 2) % 9) + 1) * int(n)
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for i, n in enumerate(number[:-1])) % 11
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return str(check % 10)
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def validate(number):
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"""Checks 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 number.isdigit():
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raise InvalidFormat()
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if len(number) != 11:
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raise InvalidLength()
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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):
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"""Checks 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))
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except ValidationError:
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return False
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