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# nid.py - functions for handling Mauritian national ID numbers
# coding: utf-8
#
# 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
"""ID number (Mauritian national identifier).
The Mauritian national ID number is a unique 14 alphanumeric identifier
assigned at birth to identify individuals. It is displayed on the National
Identity Card.
The number consists of one alphabetic character and thirteen digits:
* the first character of the person's surname at birth
* 2 digits for day of birth
* 2 digits for month of birth
* 2 digits for year of birth
* 6 digit unique id
* a check digit
More information:
* https://mnis.govmu.org/English/ID%20Card/Pages/default.aspx
"""
import datetime
import re
from stdnum.exceptions import *
from stdnum.util import clean
_nid_re = re.compile('^[A-Z][0-9]+[0-9A-Z]$')
# characters used for checksum calculation
_alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
def compact(number):
"""Convert the number to the minimal representation. This strips
surrounding whitespace and separation dash."""
return clean(number, ' ').upper().strip()
def calc_check_digit(number):
"""Calculate the check digit for the number."""
check = sum((14 - i) * _alphabet.index(n)
for i, n in enumerate(number[:13]))
return _alphabet[(17 - check) % 17]
def _get_date(number):
"""Convert the part of the number that represents a date into a
datetime. Note that the century may be incorrect."""
day = int(number[1:3])
month = int(number[3:5])
year = int(number[5:7])
try:
return datetime.date(year + 2000, month, day)
except ValueError:
raise InvalidComponent()
def validate(number):
"""Check if the number is a valid ID number."""
number = compact(number)
if len(number) != 14:
raise InvalidLength()
if not _nid_re.match(number):
raise InvalidFormat()
if calc_check_digit(number) != number[-1]:
raise InvalidChecksum()
_get_date(number)
return number
def is_valid(number):
"""Check if the number provided is a valid RFC."""
try:
return bool(validate(number))
except ValidationError:
return False
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