99 lines
3.1 KiB
Python
99 lines
3.1 KiB
Python
# iban.py - functions for handling Belgian IBANs
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# coding: utf-8
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#
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# Copyright (C) 2018 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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"""Belgian IBAN (International Bank Account Number).
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The IBAN is used to identify bank accounts across national borders. The
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Belgian IBAN is built up of the IBAN prefix (BE) and check digits, followed
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by a 3 digit bank identifier, a 7 digit account number and 2 more check
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digits.
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* https://www.nbb.be/en/payment-systems/payment-standards/bank-identification-codes
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>>> validate('BE32 123-4567890-02')
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'BE32123456789002'
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>>> validate('BE41091811735141') # incorrect national check digits
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('BE83138811735115') # unknown bank code
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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>>> validate('GR1601101050000010547023795') # not a Belgian IBAN
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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>>> to_bic('BE 48 3200 7018 4927')
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'BBRUBEBB'
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>>> to_bic('BE83138811735115') is None
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True
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"""
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from __future__ import annotations
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from stdnum import iban
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from stdnum.exceptions import *
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__all__ = ['compact', 'format', 'validate', 'is_valid']
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compact = iban.compact
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format = iban.format
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def _calc_check_digits(number: str) -> str:
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"""Calculate the check digits over the provided part of the number."""
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check = int(number) % 97
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return '%02d' % (check or 97)
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def info(number: str) -> dict[str, str]:
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"""Return a dictionary of data about the supplied number. This typically
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returns the name of the bank and a BIC if it is valid."""
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number = compact(number)
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from stdnum import numdb
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return numdb.get('be/banks').info(number[4:7])[0][1]
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def to_bic(number: str) -> str | None:
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"""Return the BIC for the bank that this number refers to."""
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return info(number).get('bic')
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def validate(number: str) -> str:
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"""Check if the number provided is a valid Belgian IBAN."""
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number = iban.validate(number, check_country=False)
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if not number.startswith('BE'):
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raise InvalidComponent()
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if number[-2:] != _calc_check_digits(number[4:-2]):
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raise InvalidChecksum()
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if not info(number):
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raise InvalidComponent()
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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 Belgian IBAN."""
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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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