returning partial chain

lib/pleroma/config/config_db.ex

@@ -278,6 +278,8 @@ defmodule Pleroma.ConfigDB do
     }
   end
 
+  defp do_convert({:partial_chain, entity}), do: %{"tuple" => [":partial_chain", inspect(entity)]}
+
   defp do_convert(entity) when is_tuple(entity) do
     value =
       entity
@@ -321,6 +323,15 @@ defmodule Pleroma.ConfigDB do
     {:proxy_url, {do_transform_string(type), parse_host(host), port}}
   end
 
+  defp do_transform(%{"tuple" => [":partial_chain", entity]}) do
+    {partial_chain, []} =
+      entity
+      |> String.replace(~r/[^\w|^{:,[|^,|^[|^\]^}|^\/|^\.|^"]^\s/, "")
+      |> Code.eval_string()
+
+    {:partial_chain, partial_chain}
+  end
+
   defp do_transform(%{"tuple" => entity}) do
     Enum.reduce(entity, {}, fn val, acc -> Tuple.append(acc, do_transform(val)) end)
   end