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