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# siren.py - functions for handling French SIREN 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
"""SIREN (a French company identification number).
The SIREN (Système d'Identification du Répertoire des Entreprises) is a 9
digit number used to identify French companies. The Luhn checksum is used
to validate the numbers.
>>> compact('552 008 443')
'552008443'
>>> is_valid('404833048')
True
>>> is_valid('404833047')
False
>>> to_tva('443 121 975')
'46 443 121 975'
"""
from stdnum.util import clean
from stdnum import luhn
# An online validation function is available but it does not provide an
# automated entry point, has usage restrictions and seems to require
# attribution to the service for any results used.
# http://avis-situation-sirene.insee.fr/
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, ' ').strip()
def is_valid(number):
"""Checks to see if the number provided is a valid number. This checks
the length, formatting and check digit."""
try:
number = compact(number)
except:
return False
return len(number) == 9 and number.isdigit() and luhn.is_valid(number)
def to_tva(number):
"""Return a TVA that prepends the two extra check digits to the SIREN."""
# note that this always returns numeric check digits
# it is unclean when the alphabetic ones are used
return '%02d%s%s' % (
int(compact(number) + '12') % 97,
' ' if ' ' in number else '',
number
)
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