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39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
# Copyright 2013-2016 Akretion - Alexis de Lattre
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# Copyright 2014 Tecnativa - Pedro M. Baeza
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# Copyright 2016 Tecnativa - Antonio Espinosa
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# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
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import logging
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logger = logging.getLogger(__name__)
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def is_sepa_creditor_identifier_valid(sepa_creditor_identifier):
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"""Check if SEPA Creditor Identifier is valid
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@param sepa_creditor_identifier: SEPA Creditor Identifier as str
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or unicode
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@return: True if valid, False otherwise
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"""
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if not isinstance(sepa_creditor_identifier, str):
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return False
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try:
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sci = str(sepa_creditor_identifier).lower()
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except Exception:
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logger.warning(
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"SEPA Creditor ID should contain only ASCII characters.")
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return False
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if len(sci) < 9:
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return False
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before_replacement = sci[7:] + sci[0:2] + '00'
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logger.debug(
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"SEPA ID check before_replacement = %s" % before_replacement)
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after_replacement = ''
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for char in before_replacement:
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if char.isalpha():
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after_replacement += str(ord(char) - 87)
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else:
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after_replacement += char
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logger.debug(
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"SEPA ID check after_replacement = %s" % after_replacement)
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return int(sci[2:4]) == (98 - (int(after_replacement) % 97))
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