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