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# This file is part of CycloneDX Python Library
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
# Copyright (c) OWASP Foundation. All Rights Reserved.
__all__ = [
'is_supported_id', 'fixup_id',
'is_expression'
]
from json import load as json_load
from typing import TYPE_CHECKING, Dict, Optional, Set
from license_expression import get_spdx_licensing # type:ignore[import-untyped]
from .schema._res import SPDX_JSON as __SPDX_JSON_SCHEMA
if TYPE_CHECKING: # pragma: no cover
from license_expression import Licensing
# region init
# python's internal module loader will assure that this init-part runs only once.
# !!! this requires to ship the actual schema data with the package.
with open(__SPDX_JSON_SCHEMA) as schema:
__IDS: Set[str] = set(json_load(schema).get('enum', []))
assert len(__IDS) > 0, 'known SPDX-IDs should be non-empty set'
__IDS_LOWER_MAP: Dict[str, str] = dict((id_.lower(), id_) for id_ in __IDS)
__SPDX_EXPRESSION_LICENSING: 'Licensing' = get_spdx_licensing()
# endregion
def is_supported_id(value: str) -> bool:
"""Validate SPDX-ID according to current spec."""
return value in __IDS
def fixup_id(value: str) -> Optional[str]:
"""Fixup SPDX-ID.
:returns: repaired value string, or `None` if fixup was unable to help.
"""
return __IDS_LOWER_MAP.get(value.lower())
def is_expression(value: str) -> bool:
"""Validate SPDX license expression.
.. note::
Utilizes `license-expression library`_ to
validate SPDX compound expression according to `SPDX license expression spec`_.
.. _SPDX license expression spec: https://spdx.github.io/spdx-spec/v3.0.1/annexes/spdx-license-expressions/
.. _license-expression library: https://github.com/nexB/license-expression
"""
try:
res = __SPDX_EXPRESSION_LICENSING.validate(value)
except Exception:
# the throw happens when internals crash due to unexpected input characters.
return False
return 0 == len(res.errors)
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