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# ik.py - functions for handling Estonian Personal ID numbers (IK)
# coding: utf-8
#
# Copyright (C) 2015 Tomas Karasek
# Copyright (C) 2015 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
"""Isikukood (Estonian Personcal ID number).
The number consists of 11 digits: the first indicates the gender and century
the person was born in, the following 6 digits the birth date, followed by a
3 digit serial and a check digit.
>>> validate('36805280109')
'36805280109'
>>> validate('36805280108') # incorrect check digit
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> get_birth_date('36805280109')
datetime.date(1968, 5, 28)
"""
import datetime
from stdnum.exceptions import *
from stdnum.util import clean
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 get_birth_date(number):
"""Split the date parts from the number and return the birth date."""
number = compact(number)
if number[0] in '12':
century = 1800
elif number[0] in '34':
century = 1900
elif number[0] in '56':
century = 2000
elif number[0] in '78':
century = 2100
else:
raise InvalidComponent()
year = century + int(number[1:3])
month = int(number[3:5])
day = int(number[5:7])
try:
return datetime.date(year, month, day)
except ValueError:
raise InvalidComponent()
def get_gender(number):
"""Get the person's birth gender ('M' or 'F')."""
number = compact(number)
if number[0] in '1357':
return 'M'
elif number[0] in '2468':
return 'F'
else:
raise InvalidComponent()
def calc_check_digit(number):
"""Calculate the check digit."""
check = sum(((i % 9) + 1) * int(n)
for i, n in enumerate(number[:-1])) % 11
if check == 10:
check = sum((((i + 2) % 9) + 1) * int(n)
for i, n in enumerate(number[:-1])) % 11
return str(check % 10)
def validate(number):
"""Check if the number provided is valid. This checks the length,
formatting, embedded date and check digit."""
number = compact(number)
if not number.isdigit():
raise InvalidFormat()
if len(number) != 11:
raise InvalidLength()
get_birth_date(number)
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,
formatting, embedded date and check digit."""
try:
return bool(validate(number))
except ValidationError:
return False
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