feat: expand onion service api

app/api/util.py

@@ -99,3 +99,23 @@ def list_resources(  # pylint: disable=too-many-arguments,too-many-locals
     except Exception:  # pylint: disable=broad-exception-caught
         logger.exception("An unexpected error occurred")
         abort(500)
+
+
+def get_single_resource(model: Type[Any], id_: int, resource_name: str) -> ResponseReturnValue:
+    try:
+        resource = db.session.get(model, id_)
+        if not resource:
+            return jsonify({
+                "Error": "resource_not_found",
+                "Message": f"No {resource_name} found with ID {id_}"
+            }), 404
+        return jsonify({resource_name: resource.to_dict()}), 200
+    except Exception:  # pylint: disable=broad-exception-caught
+        logger.exception("An unexpected error occurred while retrieving the onion")
+        abort(500)
+
+
+def validate_description(description: Optional[str]) -> bool:
+    if description is None:
+        return False
+    return True