Add: Add a base class for Enums in python-gvm

This will simplify all our enums and reduce duplicate code.

gvm/_enum.py

@@ -0,0 +1,38 @@
+# SPDX-FileCopyrightText: 2024 Greenbone AG
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+
+from enum import Enum as PythonEnum
+from typing import Optional
+
+from typing_extensions import Self
+
+from gvm.errors import InvalidArgument
+
+
+class Enum(PythonEnum):
+    """
+    Base class for Enums in python-gvm
+    """
+
+    @classmethod
+    def from_string(
+        cls,
+        value: Optional[str],
+    ) -> Optional[Self]:
+        """
+        Convert a string value into an Enum instance
+
+        If value is None or empty None is returned
+        """
+        if not value:
+            return None
+
+        try:
+            return cls[value.replace(" ", "_").upper()]
+        except KeyError:
+            raise InvalidArgument(
+                f"Invalid argument {value} for {cls.__name__}.from_string. "
+                f"Allowed values are {','.join(e.name for e in cls)}."
+            ) from None

pyproject.toml

@@ -32,7 +32,7 @@ python = "^3.9"
 paramiko = ">=2.7.1"
 lxml = ">=4.5.0"
 defusedxml = ">=0.6"
-
+typing-extensions = ">=4.9.0"
 
 [tool.poetry.group.dev.dependencies]
 coverage = ">=7.2"