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# coding=utf-8
# nn.py - function for handling Belgian national numbers
#
# Copyright (C) 2021-2022 Cédric Krier
#
# 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
"""NN, NISS (Belgian national number).
The national number is a unique identifier of Belgian. The number consists of
11 digits.
More information:
* https://fr.wikipedia.org/wiki/Numéro_de_registre_national
>>> compact('85.07.30-033 28')
'85073003328'
>>> validate('85 07 30 033 28')
'85073003328'
>>> validate('17 07 30 033 84')
'17073003384'
>>> validate('12345678901')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('85073003328')
'85.07.30-033.28'
>>> get_birth_date('85.07.30-033 28')
datetime.date(1985, 7, 30)
"""
import datetime
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."""
number = clean(number, ' -.').strip()
return number
def _checksum(number):
"""Calculate the checksum and return the detected century."""
numbers = [number]
if int(number[:2]) + 2000 <= datetime.date.today().year:
numbers.append('2' + number)
for century, n in zip((19, 20), numbers):
if 97 - (int(n[:-2]) % 97) == int(n[-2:]):
return century
return False
def validate(number):
"""Check if the number if a valid National Number."""
number = compact(number)
if not isdigits(number) or int(number) <= 0:
raise InvalidFormat()
if len(number) != 11:
raise InvalidLength()
if not _checksum(number):
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid National 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 (
'.'.join(number[i:i + 2] for i in range(0, 6, 2)) +
'-' + '.'.join([number[6:9], number[9:11]]))
def get_birth_date(number):
"""Return the date of birth"""
number = compact(number)
century = _checksum(number)
if not century:
raise InvalidChecksum()
try:
return datetime.datetime.strptime(
str(century) + number[:6], '%Y%m%d').date()
except ValueError:
raise InvalidComponent()
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