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# fodselsnummer.py - functions for handling Norwegian birth numbers
# coding: utf-8
#
# Copyright (C) 2018 Ilya Vihtinsky
# Copyright (C) 2018 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
"""Fødselsnummer (Norwegian birth number, the national identity number).
The Fødselsnummer is an eleven-digit number that is built up of the date of
birth of the person, a serial number and two check digits.
More information:
* https://no.wikipedia.org/wiki/F%C3%B8dselsnummer
* https://en.wikipedia.org/wiki/National_identification_number#Norway
>>> validate('684131 52112')
'68413152112'
>>> get_gender('684131 52112')
'M'
>>> validate('684131 52123')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('68413152112')
'684131 52112'
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
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, ' -:')
def calc_check_digit1(number):
"""Calculate the first check digit for the number."""
weights = (3, 7, 6, 1, 8, 9, 4, 5, 2)
return str((11 - sum(w * int(n) for w, n in zip(weights, number))) % 11)
def calc_check_digit2(number):
"""Calculate the second check digit for the number."""
weights = (5, 4, 3, 2, 7, 6, 5, 4, 3, 2)
return str((11 - sum(w * int(n) for w, n in zip(weights, number))) % 11)
def get_gender(number):
"""Get the person's birth gender ('M' or 'F')."""
number = compact(number)
if int(number[8]) % 2:
return 'M'
else:
return 'F'
def validate(number):
"""Check if the number is a valid birth number."""
number = compact(number)
if len(number) != 11:
raise InvalidLength()
if not isdigits(number):
raise InvalidFormat()
if number[-2] != calc_check_digit1(number):
raise InvalidChecksum()
if number[-1] != calc_check_digit2(number):
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid birth number."""
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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