70 lines
2.2 KiB
Python
70 lines
2.2 KiB
Python
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# lei.py - functions for handling Legal Entity Identifiers (LEIs)
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# coding: utf-8
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#
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# Copyright (C) 2017 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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"""LEI (Legal Entity Identifier).
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The Legal Entity Identifier (LEI) is used to identify legal entities for use
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in financial transactions. A LEI is a 20-character alphanumeric string that
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consists of a 4-character issuing LOU (Local Operating Unit), 2 digits that
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are often 0, 13 digits to identify the organisation and 2 check digits.
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More information:
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* https://en.wikipedia.org/wiki/Legal_Entity_Identifier
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* https://www.lei-lookup.com/
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* https://www.gleif.org/
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* http://openleis.com/
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>>> validate('213800KUD8LAJWSQ9D15')
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'213800KUD8LAJWSQ9D15'
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>>> validate('213800KUD8LXJWSQ9D15')
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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.iso7064 import mod_97_10
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from stdnum.util import clean
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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 white space."""
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return clean(number, ' -').strip().upper()
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def validate(number: str) -> str:
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"""Check if the number is valid. This checks the length, format and check
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digits."""
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number = compact(number)
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mod_97_10.validate(number)
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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 valid."""
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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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