105 lines
3.3 KiB
Python
105 lines
3.3 KiB
Python
# egn.py - functions for handling Bulgarian national identification numbers
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# coding: utf-8
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#
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# Copyright (C) 2012, 2013 Arthur de Jong
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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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"""EGN (ЕГН, Единен граждански номер, Bulgarian personal identity codes).
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It is a 10-digit number of which the first 6 digits denote the person's
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birth date, the next three digits represent a birth order number from
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which the person's gender can be determined and the last digit is a check
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digit.
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>>> compact('752316 926 3')
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'7523169263'
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>>> validate('8032056031')
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'8032056031'
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>>> get_birth_date('7542011030')
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datetime.date(2075, 2, 1)
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>>> validate('7552A10004') # invalid digit
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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>>> validate('8019010008') # invalid date
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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"""
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import datetime
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from stdnum.exceptions import *
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from stdnum.util import clean
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def compact(number):
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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, ' -.').upper().strip()
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def calc_check_digit(number):
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"""Calculate the check digit. The number passed should not have the
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check digit included."""
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weights = (2, 4, 8, 5, 10, 9, 7, 3, 6)
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return str(sum(weights[i] * int(n) for i, n in enumerate(number)) % 11 % 10)
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def get_birth_date(number):
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"""Split the date parts from the number and return the birth date."""
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year = int(number[0:2]) + 1900
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month = int(number[2:4])
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day = int(number[4:6])
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if month > 40:
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year += 100
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month -= 40
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elif month > 20:
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year -= 100
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month -= 20
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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()
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def validate(number):
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"""Checks to see if the number provided is a valid national
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identification number. This checks the length, formatting, embedded
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date and check digit."""
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number = compact(number)
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if not number.isdigit():
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raise InvalidFormat()
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if len(number) != 10:
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raise InvalidLength()
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# check if birth date is valid
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birth_date = get_birth_date(number)
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# TODO: check that the birth date is not in the future
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# check the check digit
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if calc_check_digit(number[:-1]) != number[-1]:
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raise InvalidChecksum()
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid national
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identification number. This checks the length, formatting, embedded
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date and check digit."""
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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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