updates

Backend/venv/lib/python3.12/site-packages/cyclonedx/spdx.py

@@ -0,0 +1,77 @@
+# 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)