85 lines
2.5 KiB
Python
85 lines
2.5 KiB
Python
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# iso9362.py - functions for handling ISO 9362 Business identifier codes
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#
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# Copyright (C) 2015 Lifealike Ltd
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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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"""ISO 9362 (Business identifier codes).
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An ISO 9362 identifier (also: BIC, BEI, or SWIFT code) uniquely
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identifies an institution. They are commonly used to route financial
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transactions.
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The code consists of a 4 letter institution code, a 2 letter country code,
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and a 2 character location code, optionally followed by a three character
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branch code.
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>>> validate('AGRIFRPP882')
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'AGRIFRPP882'
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>>> validate('AGRIFRPP')
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'AGRIFRPP'
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>>> validate('AGRIFRPP8')
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Traceback (most recent call last):
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...
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InvalidLength: ..
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>>> validate('AGRIF2PP') # country code can't contain digits
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Traceback (most recent call last):
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...
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InvalidFormat: ..
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>>> format('agriFRPP') # conventionally caps
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'AGRIFRPP'
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"""
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import re
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from stdnum.exceptions import *
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from stdnum.util import clean
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_bic_re = re.compile(r'^[A-Z]{6}[0-9A-Z]{2}([0-9A-Z]{3})?$')
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def compact(number):
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"""Convert the number to the minimal representation. This strips the
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number of any surrounding whitespace."""
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return clean(number).strip().upper()
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def validate(number):
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"""Checks to see if the number provided is a valid routing number. This
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checks the length and characters in each position."""
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number = compact(number)
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if len(number) not in (8, 11):
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raise InvalidLength()
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match = _bic_re.search(number)
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if not match:
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raise InvalidFormat()
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid BIC. This checks the
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length and characters in each position."""
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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):
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"""Reformat the passed number to the standard format."""
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return compact(number)
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