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# pnf.py - functions for handling Bulgarian personal number of a foreigner
# coding: utf-8
#
# Copyright (C) 2012-2015 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
"""PNF (ЛНЧ, Личен номер на чужденец, Bulgarian number of a foreigner).
The personal number of a foreigner is a 10-digit number where the last digit
is the result of a weighted checksum.
>>> validate('7111 042 925')
'7111042925'
>>> validate('7111042922') # invalid check digit
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('71110A2922') # invalid digit
Traceback (most recent call last):
...
InvalidFormat: ...
"""
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, ' -.').upper().strip()
def calc_check_digit(number):
"""Calculate the check digit. The number passed should not have the
check digit included."""
weights = (21, 19, 17, 13, 11, 9, 7, 3, 1)
return str(sum(w * int(n) for w, n in zip(weights, number)) % 10)
def validate(number):
"""Check if the number is a valid national identification number. This
checks the length, formatting, embedded date and check digit."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) != 10:
raise InvalidLength()
if calc_check_digit(number[:-1]) != number[-1]:
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid national identification number."""
try:
return bool(validate(number))
except ValidationError:
return False
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