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# bic.py - functions for handling ISO 9362 Business identifier codes
#
# Copyright (C) 2015 Lifealike Ltd
# Copyright (C) 2017-2018 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""BIC (ISO 9362 Business identifier codes).
An ISO 9362 identifier (also: BIC, BEI, or SWIFT code) uniquely
identifies an institution. They are commonly used to route financial
transactions.
The code consists of a 4 letter institution code, a 2 letter country code,
and a 2 character location code, optionally followed by a three character
branch code.
>>> validate('AGRIFRPP882')
'AGRIFRPP882'
>>> validate('ABNA BE 2A')
'ABNABE2A'
>>> validate('AGRIFRPP')
'AGRIFRPP'
>>> validate('AGRIFRPP8')
Traceback (most recent call last):
...
InvalidLength: ..
>>> validate('AGRIF2PP') # country code can't contain digits
Traceback (most recent call last):
...
InvalidFormat: ..
>>> format('agriFRPP') # conventionally caps
'AGRIFRPP'
"""
import re
from stdnum.exceptions import *
from stdnum.util import clean
_bic_re = re.compile(r'^[A-Z]{6}[0-9A-Z]{2}([0-9A-Z]{3})?$')
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any surrounding whitespace."""
return clean(number, ' -').strip().upper()
def validate(number):
"""Check if the number is a valid routing number. This checks the length
and characters in each position."""
number = compact(number)
if len(number) not in (8, 11):
raise InvalidLength()
match = _bic_re.search(number)
if not match:
raise InvalidFormat()
return number
def is_valid(number):
"""Check if the number provided is a valid BIC."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
return compact(number)
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