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# cnp.py - functions for handling Romanian CNP 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
"""CNP (Cod Numeric Personal, Romanian Numerical Personal Code).
The CNP is a 13 digit number that includes information on the person's
gender, birth date and country zone.
>>> compact('1630615123457')
'1630615123457'
>>> is_valid('1630615123457')
True
>>> is_valid('8800101221144') # invalid first digit
False
>>> is_valid('1632215123457') # invalid date
False
>>> is_valid('1630615123458') # invalid check digit
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 for personal codes. The number passed
should not have the check digit included."""
# note that this algorithm has not been confirmed by an independent source
weights = (2, 7, 9, 1, 4, 6, 3, 5, 8, 2, 7, 9)
check = sum(weights[i] * int(n) for i, n in enumerate(number)) % 11
return '1' if check == 10 else str(check)
def get_birth_date(number):
"""Split the date parts from the number and return the birth date."""
centuries = {
'1': 1900, '2': 1900, '3': 1800, '4': 1800, '5': 2000, '6': 2000,
} # we assume 1900 for the others in order to try to construct a date
year = int(number[1:3]) + centuries.get(number[0], 1900)
month = int(number[3:5])
day = int(number[5:7])
return datetime.date(year, month, day)
def is_valid(number):
"""Checks to see if the number provided is a valid VAT number. This checks
the length, formatting and check digit."""
try:
number = compact(number)
except:
return False
if len(number) != 13 or not number.isdigit():
return False
# first digit should be a known one (9=foreigner)
if number[0] not in '1234569':
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:
return False
# number[7:9] is the county, we ignore it for now, just check last digit
return calc_check_digit(number[:-1]) == number[-1]
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