82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
# isni.py - functions for handling International Standard Name Identifiers
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#
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# Copyright (C) 2025 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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"""ISNI (International Standard Name Identifier).
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The International Standard Name Identifier (ISNI) is used to identify
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contributors to media content such as books, television programmes, and
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newspaper articles. The number consists of 16 digits where the last character
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is a check digit.
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More information:
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* https://en.wikipedia.org/wiki/International_Standard_Name_Identifier
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* https://isni.org/
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>>> validate('0000 0001 2281 955X')
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'000000012281955X'
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>>> validate('0000 0001 1111 955X')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('0000 0001 2281')
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> format('000000012281955X')
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'0000 0001 2281 955X'
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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_11_2
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from stdnum.util import clean, isdigits
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def compact(number: str) -> str:
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"""Convert the ISNI to the minimal representation. This strips the number
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of any valid ISNI separators and removes surrounding whitespace."""
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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 a valid ISNI. This checks the length and
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whether the check digit is correct."""
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number = compact(number)
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if not isdigits(number[:-1]):
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raise InvalidFormat()
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if len(number) != 16:
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raise InvalidLength()
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mod_11_2.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 provided is a valid ISNI."""
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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: str) -> str:
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"""Reformat the number to the standard presentation format."""
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number = compact(number)
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return ' '.join((number[:4], number[4:8], number[8:12], number[12:16]))
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