114 lines
3.5 KiB
Python
114 lines
3.5 KiB
Python
# rut.py - functions for handling Uruguay RUT numbers
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# coding: utf-8
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#
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# Copyright (C) 2019 Leandro Regueiro
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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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"""RUT (Registro Único Tributario, Uruguay tax number).
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The Registro Único Tributario (RUT) is an identifier of legal entities for
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tax purposes.
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This number consists of 12 digits, the first two indicate the registration
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number, followed by a 6 digit sequence number, followed by 001 and a check
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digit.
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More information:
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* https://www.agesic.gub.uy/innovaportal/file/1634/1/modelo_de_datos.pdf (page 71)
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* https://servicios.dgi.gub.uy/ServiciosEnLinea/dgi--servicios-en-linea--consulta-de-certifcado-unico
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>>> validate('21-100342-001-7')
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'211003420017'
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>>> validate('UY 21 140634 001 1')
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'211406340011'
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>>> validate('210303670014')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('12345678')
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> format('211003420017')
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'21-100342-001-7'
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"""
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from __future__ import annotations
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from stdnum.exceptions import *
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from stdnum.util import clean, isdigits
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# There are various online validation services available but they require
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# registration and WS-Securety signatures.
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# https://www.agesic.gub.uy/innovaportal/v/1600/9/agesic/consulta-de-entidad-por-rut.html
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# https://servicios.dgi.gub.uy/ServiciosEnLinea/ampliar/servicios-automatizados
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def compact(number: str) -> str:
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"""Convert the number to the minimal representation.
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This strips the number of any valid separators and removes surrounding
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whitespace.
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"""
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number = clean(number, ' -').upper().strip()
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if number.startswith('UY'):
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return number[2:]
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return number
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def calc_check_digit(number: str) -> str:
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"""Calculate the check digit."""
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weights = (4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2)
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total = sum(int(n) * w for w, n in zip(weights, number))
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return str(-total % 11)
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def validate(number: str) -> str:
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"""Check if the number is a valid Uruguay RUT number.
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This checks the length, formatting and check digit.
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"""
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number = compact(number)
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if len(number) != 12:
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raise InvalidLength()
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if not isdigits(number):
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raise InvalidFormat()
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if number[:2] < '01' or number[:2] > '22':
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raise InvalidComponent()
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if number[2:8] == '000000':
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raise InvalidComponent()
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if number[8:11] != '001':
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raise InvalidComponent()
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if number[-1] != calc_check_digit(number):
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raise InvalidChecksum()
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return number
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def is_valid(number: str) -> bool:
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"""Check if the number is a valid Uruguay RUT number."""
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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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def format(number: str) -> str:
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"""Reformat the number to the standard presentation format."""
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number = compact(number)
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return '-'.join([number[:2], number[2:-4], number[-4:-1], number[-1]])
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