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# cnp.py - functions for handling Romanian CNP numbers
# coding: utf-8
#
# Copyright (C) 2012-2020 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.
More information:
* https://ro.wikipedia.org/wiki/Cod_numeric_personal
* https://github.com/vimishor/cnp-spec/blob/master/spec.md
>>> validate('1630615123457')
'1630615123457'
>>> get_county('1630615123457')
'Cluj'
>>> validate('0800101221142') # invalid first digit
Traceback (most recent call last):
...
InvalidComponent: ...
>>> validate('1632215123457') # invalid date
Traceback (most recent call last):
...
InvalidComponent: ...
>>> validate('1630615993454') # invalid county
Traceback (most recent call last):
...
InvalidComponent: ...
>>> validate('1630615123458') # invalid check digit
Traceback (most recent call last):
...
InvalidChecksum: ...
"""
from __future__ import annotations
import datetime
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
# The Romanian counties
_COUNTIES = {
'01': 'Alba',
'02': 'Arad',
'03': 'Arges',
'04': 'Bacau',
'05': 'Bihor',
'06': 'Bistrita-Nasaud',
'07': 'Botosani',
'08': 'Brasov',
'09': 'Braila',
'10': 'Buzau',
'11': 'Caras-Severin',
'12': 'Cluj',
'13': 'Constanta',
'14': 'Covasna',
'15': 'Dambovita',
'16': 'Dolj',
'17': 'Galati',
'18': 'Gorj',
'19': 'Harghita',
'20': 'Hunedoara',
'21': 'Ialomita',
'22': 'Iasi',
'23': 'Ilfov',
'24': 'Maramures',
'25': 'Mehedinti',
'26': 'Mures',
'27': 'Neamt',
'28': 'Olt',
'29': 'Prahova',
'30': 'Satu Mare',
'31': 'Salaj',
'32': 'Sibiu',
'33': 'Suceava',
'34': 'Teleorman',
'35': 'Timis',
'36': 'Tulcea',
'37': 'Vaslui',
'38': 'Valcea',
'39': 'Vrancea',
'40': 'Bucuresti',
'41': 'Bucuresti - Sector 1',
'42': 'Bucuresti - Sector 2',
'43': 'Bucuresti - Sector 3',
'44': 'Bucuresti - Sector 4',
'45': 'Bucuresti - Sector 5',
'46': 'Bucuresti - Sector 6',
'47': 'Bucuresti - Sector 7 (desfiintat)',
'48': 'Bucuresti - Sector 8 (desfiintat)',
'51': 'Calarasi',
'52': 'Giurgiu',
}
def compact(number: str) -> str:
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' -').strip()
def calc_check_digit(number: str) -> str:
"""Calculate the check digit for personal codes."""
# 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(w * int(n) for w, n in zip(weights, number)) % 11
return '1' if check == 10 else str(check)
def get_birth_date(number: str) -> datetime.date:
"""Split the date parts from the number and return the birth date."""
number = compact(number)
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])
try:
return datetime.date(year, month, day)
except ValueError:
raise InvalidComponent()
def get_county(number: str) -> str:
"""Get the county name from the number"""
try:
return _COUNTIES[compact(number)[7:9]]
except KeyError:
raise InvalidComponent()
def validate(number: str) -> str:
"""Check if the number is a valid VAT number. This checks the length,
formatting and check digit."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
# first digit should be a known one
# (7,8=foreign resident, 9=other foreigner but apparently only as NIF)
if number[0] not in '123456789':
raise InvalidComponent()
if len(number) != 13:
raise InvalidLength()
# check if birth date is valid
get_birth_date(number)
# TODO: check that the birth date is not in the future
get_county(number)
if calc_check_digit(number[:-1]) != number[-1]:
raise InvalidChecksum()
return number
def is_valid(number: str) -> bool:
"""Check if the number is a valid VAT number."""
try:
return bool(validate(number))
except ValidationError:
return False
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