144 lines
4.7 KiB
Python
144 lines
4.7 KiB
Python
# fodselsnummer.py - functions for handling Norwegian birth numbers
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# coding: utf-8
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#
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# Copyright (C) 2018 Ilya Vihtinsky
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# Copyright (C) 2018 Arthur de Jong
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# Copyright (C) 2020 Leon Sandøy
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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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"""Fødselsnummer (Norwegian birth number, the national identity number).
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The Fødselsnummer is an eleven-digit number that is built up of the date of
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birth of the person, a serial number and two check digits.
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More information:
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* https://no.wikipedia.org/wiki/F%C3%B8dselsnummer
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* https://en.wikipedia.org/wiki/National_identification_number#Norway
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>>> validate('151086 95088')
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'15108695088'
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>>> get_gender('151086-95088')
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'F'
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>>> validate('15108695077')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> format('15108695077')
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'151086 95077'
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"""
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from __future__ import annotations
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import datetime
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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, ' -:')
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def calc_check_digit1(number: str) -> str:
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"""Calculate the first check digit for the number."""
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weights = (3, 7, 6, 1, 8, 9, 4, 5, 2)
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return str((11 - sum(w * int(n) for w, n in zip(weights, number))) % 11)
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def calc_check_digit2(number: str) -> str:
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"""Calculate the second check digit for the number."""
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weights = (5, 4, 3, 2, 7, 6, 5, 4, 3, 2)
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return str((11 - sum(w * int(n) for w, n in zip(weights, number))) % 11)
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def get_gender(number: str) -> str:
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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 int(number[8]) % 2:
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return 'M'
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else:
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return 'F'
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def get_birth_date(number: str) -> datetime.date:
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"""Determine and return the birth date."""
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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])
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individual_digits = int(number[6:9])
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# Raise a more useful exception for FH numbers
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if day >= 80:
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raise InvalidComponent(
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'This number is an FH-number, and does not contain birth date information by design.')
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# Correct the birth day for D-numbers. These have a modified first digit.
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# https://no.wikipedia.org/wiki/F%C3%B8dselsnummer#D-nummer
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if day > 40:
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day -= 40
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# Correct the birth month for H-numbers. These have a modified third digit.
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# https://no.wikipedia.org/wiki/F%C3%B8dselsnummer#H-nummer
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if month > 40:
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month -= 40
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if individual_digits < 500:
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year += 1900
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elif individual_digits < 750 and year >= 54:
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year += 1800
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elif individual_digits < 1000 and year < 40:
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year += 2000
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elif 900 <= individual_digits < 1000 and year >= 40:
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year += 1900
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else:
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# The birth century falls outside all defined ranges.
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raise InvalidComponent('The birthdate century cannot be determined')
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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('The number does not contain valid birth date information.')
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def validate(number: str) -> str:
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"""Check if the number is a valid birth number."""
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number = compact(number)
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if len(number) != 11:
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raise InvalidLength()
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if not isdigits(number):
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raise InvalidFormat()
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if number[-2] != calc_check_digit1(number):
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raise InvalidChecksum()
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if number[-1] != calc_check_digit2(number):
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raise InvalidChecksum()
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if get_birth_date(number) > datetime.date.today():
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raise InvalidComponent(
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'The birth date information is valid, but this person has not been born yet.')
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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 birth number."""
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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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