refactors

backend/utils/enum_validation.py

@@ -0,0 +1,32 @@
+"""Utilities for validating enum values from strings."""
+
+from enum import Enum
+from typing import TypeVar
+
+from exceptions import BadRequestError
+
+T = TypeVar("T", bound=Enum)
+
+
+def validate_enum(enum_class: type[T], value: str, field_name: str = "value") -> T:
+    """
+    Validate and convert string to enum.
+
+    Args:
+        enum_class: The enum class to validate against
+        value: The string value to validate
+        field_name: Name of the field for error messages
+
+    Returns:
+        The validated enum value
+
+    Raises:
+        BadRequestError: If the value is not a valid enum member
+    """
+    try:
+        return enum_class(value)
+    except ValueError:
+        valid_values = ", ".join(e.value for e in enum_class)
+        raise BadRequestError(
+            f"Invalid {field_name}: {value}. Must be one of: {valid_values}"
+        ) from None