1# rif.py - functions for handling Venezuelan VAT numbers 2# coding: utf-8 3# 4# Copyright (C) 2019 Arthur de Jong 5# 6# This library is free software; you can redistribute it and/or 7# modify it under the terms of the GNU Lesser General Public 8# License as published by the Free Software Foundation; either 9# version 2.1 of the License, or (at your option) any later version. 10# 11# This library is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14# Lesser General Public License for more details. 15# 16# You should have received a copy of the GNU Lesser General Public 17# License along with this library; if not, write to the Free Software 18# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19# 02110-1301 USA 20 21"""RIF (Registro de Identificación Fiscal, Venezuelan VAT number). 22 23The Registro de Identificación Fiscal (RIF) is the Venezuelan fiscal 24registration number. The number consists of 10 digits where the first digit 25denotes the type of number (person, company or government) and the last digit 26is a check digit. 27 28>>> validate('V-11470283-4') 29'V114702834' 30>>> validate('V-11470283-3') # invalid check digit 31Traceback (most recent call last): 32 ... 33InvalidChecksum: ... 34""" 35 36from stdnum.exceptions import * 37from stdnum.util import clean, isdigits 38 39 40def compact(number): 41 """Convert the number to the minimal representation. This strips the 42 number of any valid separators and removes surrounding whitespace.""" 43 return clean(number, ' -').upper().strip() 44 45 46# Known number types and their corresponding value in the check 47# digit calculation 48_company_types = { 49 'V': 4, # natural person born in Venezuela 50 'E': 8, # foreign natural person 51 'J': 12, # company 52 'P': 16, # passport 53 'G': 20, # government 54} 55 56 57def calc_check_digit(number): 58 """Calculate the check digit for the RIF.""" 59 number = compact(number) 60 weights = (3, 2, 7, 6, 5, 4, 3, 2) 61 c = _company_types[number[0]] 62 c += sum(w * int(n) for w, n in zip(weights, number[1:9])) 63 return '00987654321'[c % 11] 64 65 66def validate(number): 67 """Check if the number provided is a valid RIF. This checks the length, 68 formatting and check digit.""" 69 number = compact(number) 70 if len(number) != 10: 71 raise InvalidLength() 72 if number[0] not in _company_types: 73 raise InvalidComponent() 74 if not isdigits(number[1:]): 75 raise InvalidFormat() 76 if number[-1] != calc_check_digit(number): 77 raise InvalidChecksum() 78 return number 79 80 81def is_valid(number): 82 """Check if the number provided is a valid RIF. This checks the length, 83 formatting and check digit.""" 84 try: 85 return bool(validate(number)) 86 except ValidationError: 87 return False 88