91 lines
3 KiB
Python
91 lines
3 KiB
Python
# cui.py - functions for handling Peruvian personal 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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"""CUI (Cédula Única de Identidad, Peruvian identity number).
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The Cédula Única de Identidad (CUI) is the unique identifier for persons that
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appears on the Documento Nacional de Identidad (DNI), the national identity
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document of Peru. The number consists of 8 digits and an optional extra check
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digit.
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More information:
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* https://www.gob.pe/235-documento-nacional-de-identidad-dni
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* https://es.wikipedia.org/wiki/Documento_Nacional_de_Identidad_(Perú)
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>>> validate('10117410')
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'10117410'
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>>> validate('10117410-2')
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'101174102'
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>>> validate('10117410-3') # 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_ruc('10117410-2')
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'10101174102'
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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().upper()
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def calc_check_digits(number: str) -> str:
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"""Calculate the possible check digits for the CUI."""
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number = compact(number)
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weights = (3, 2, 7, 6, 5, 4, 3, 2)
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c = sum(w * int(n) for w, n in zip(weights, number)) % 11
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return '65432110987'[c] + 'KJIHGFEDCBA'[c]
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def to_ruc(number: str) -> str:
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"""Convert the number to a valid RUC."""
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from stdnum.pe import ruc
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number = '10' + compact(number)[:8]
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return number + ruc.calc_check_digit(number)
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def validate(number: str) -> str:
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"""Check if the number provided is a valid CUI. 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) not in (8, 9):
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raise InvalidLength()
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if not isdigits(number[:8]):
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raise InvalidFormat()
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if len(number) > 8 and number[-1] not in calc_check_digits(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 CUI. 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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