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# egn.py - functions for handling Bulgarian national identification numbers
# coding: utf-8
#
# Copyright (C) 2012 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
"""EGN (ЕГН, Единен граждански номер, Bulgarian personal identity codes).
It is a 10-digit number of which the first 6 digits denote the person's
birth date, the next three digits represent a birth order number from
which the person's gender can be determined and the last digit is a check
digit.
>>> compact('752316 926 3')
'7523169263'
>>> is_valid('8032056031')
True
>>> get_birth_date('7542011030')
datetime.date(2075, 2, 1)
>>> is_valid('7552010004') # invalid check digit
False
>>> is_valid('8019010008') # invalid date
False
"""
import datetime
from stdnum.util import clean
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, ' -.').upper().strip()
def calc_check_digit(number):
"""Calculate the check digit. The number passed should not have the
check digit included."""
weights = (2, 4, 8, 5, 10, 9, 7, 3, 6)
return str(sum(weights[i] * int(n) for i, n in enumerate(number)) % 11 % 10)
def get_birth_date(number):
"""Split the date parts from the number and return the birth date."""
year = int(number[0:2]) + 1900
month = int(number[2:4])
day = int(number[4:6])
if month > 40:
year += 100
month -= 40
elif month > 20:
year -= 100
month -= 20
return datetime.date(year, month, day)
def is_valid(number):
"""Checks to see if the number provided is a valid national
identification number. This checks the length, formatting, embedded
date and check digit."""
try:
number = compact(number)
except:
return False
if not number.isdigit() or len(number) != 10:
return False
# check if birth date is valid
try:
birth_date = get_birth_date(number)
# TODO: check that the birth date is not in the future
except ValueError, e:
return False
# check the check digit
return calc_check_digit(number[:-1]) == number[-1]
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