90 lines
2.9 KiB
Python
90 lines
2.9 KiB
Python
# ruc.py - functions for handling Peruvian fiscal numbers
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# coding: utf-8
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#
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# Copyright (C) 2019 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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"""RUC (Registro Único de Contribuyentes, Peruvian company tax number).
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The RUC (Registro Único de Contribuyentes) is the tax number of Peru assigned
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to legal and natural persons. The number consists of 11 digits, the first two
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indicate the kind of number, for personal numbers it is followed by the DNI
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and a check digit.
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More information:
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* https://www.sunat.gob.pe/legislacion/ruc/
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* https://consultarelruc.pe/
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>>> validate('20512333797')
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'20512333797'
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>>> validate('20512333798') # 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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>>> to_dni('10054148289')
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'05414828'
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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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def compact(number: str) -> str:
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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, ' ').strip()
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def calc_check_digit(number: str) -> str:
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"""Calculate the check digit."""
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weights = (5, 4, 3, 2, 7, 6, 5, 4, 3, 2)
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return str((11 - sum(w * int(n) for w, n in zip(weights, number)) % 11) % 10)
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def to_dni(number: str) -> str:
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"""Return the DNI (CUI) part of the number for natural persons."""
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number = validate(number)
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if not number.startswith('10'):
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raise InvalidComponent() # only for persons
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return number[2:10]
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def validate(number: str) -> str:
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"""Check if the number provided is a valid RUC. This checks the length,
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formatting and check digit."""
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number = compact(number)
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if len(number) != 11:
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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] not in ('10', '15', '17', '20'):
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raise InvalidComponent() # not person or company
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if not number.endswith(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 provided is a valid RUC. This checks the length,
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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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