88 lines
2.7 KiB
Python
88 lines
2.7 KiB
Python
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# cbu.py - functions for handling Argentinian CBU numbers
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# coding: utf-8
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#
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# Copyright (C) 2016 Luciano Rossi
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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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"""CBU (Clave Bancaria Uniforme, Argentine bank account number).
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CBU it s a code of the Banks of Argentina to identify customer accounts. The
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number consists of 22 digits and consists of a 3 digit bank identifier,
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followed by a 4 digit branch identifier, a check digit, a 13 digit account
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identifier and another check digit.
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More information:
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* https://es.wikipedia.org/wiki/Clave_Bancaria_Uniforme
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>>> validate('2850590940090418135201')
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'2850590940090418135201'
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>>> format('2850590940090418135201')
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'28505909 40090418135201'
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>>> validate('2810590940090418135201')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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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 = (3, 1, 7, 9)
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check = sum(int(n) * weights[i % 4]
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for i, n in enumerate(reversed(number)))
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return str((10 - check) % 10)
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def validate(number: str) -> str:
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"""Check if the number is a valid CBU."""
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number = compact(number)
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if len(number) != 22:
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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 calc_check_digit(number[:7]) != number[7]:
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raise InvalidChecksum()
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if calc_check_digit(number[8:-1]) != number[-1]:
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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 CBU."""
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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[:8], number[8:]))
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