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# kennitala.py - functions for handling Icelandic identity codes
# coding: utf-8
#
# Copyright (C) 2015 Tuomas Toivonen
# 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
"""Kennitala (Icelandic personal and organisation identity code).
Module for handling Icelandic personal and organisation identity codes
(kennitala).
>>> validate('450401-3150') # organisation
'4504013150'
>>> validate('120174-3399') # individual
'1201743399'
>>> validate('530575-0299')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('320174-3399')
Traceback (most recent call last):
...
InvalidComponent: ...
>>> format('1201743399')
'120174-3399'
"""
import datetime
import re
from stdnum.exceptions import *
from stdnum.util import clean
# Icelandic personal and organisation identity codes are composed of
# date part, a dash, two random digits, a checksum, and a century
# indicator where '9' for 1900-1999 and '0' for 2000 and beyond. For
# organisations instead of birth date, the registration date is used,
# and number 4 is added to the first digit.
_kennitala_re = re.compile(
r'^(?P<day>[01234567]\d)(?P<month>[01]\d)(?P<year>\d\d)'
r'(?P<random>\d\d)(?P<control>\d)'
r'(?P<century>[09])$')
def compact(number):
"""Convert the kennitala to the minimal representation. This
strips surrounding whitespace and separation dash, and converts it
to upper case."""
return clean(number, '-').upper().strip()
def checksum(number):
"""Calculate the checksum."""
weights = (3, 2, 7, 6, 5, 4, 3, 2, 1, 0)
return sum(w * int(n) for w, n in zip(weights, number)) % 11
def validate(number):
"""Check if the number provided is a valid kennitala. It checks the
format, whether a valid date is given and whether the check digit is
correct."""
number = compact(number)
match = _kennitala_re.search(number)
if not match:
raise InvalidFormat()
day = int(match.group('day'))
month = int(match.group('month'))
year = int(match.group('year'))
if match.group('century') == '9':
year += 1900
else:
year += 2000
# check if birth date or registration data is valid
try:
if day >= 40: # organisation
datetime.date(year, month, day - 40)
else: # individual
datetime.date(year, month, day)
except ValueError:
raise InvalidComponent()
# validate the checksum
if checksum(number) != 0:
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number provided is a valid HETU. It checks the format,
whether a valid date is given and whether the check digit is correct."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
number = compact(number)
return number[:6] + '-' + number[6:]
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