Add replacement for $

Signed-off-by: marcin mikołajczak <[email protected]>

lib/pleroma/web/activity_pub/transmogrifier.ex

@@ -1020,6 +1020,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
   defp replace_instance_host(content, host) when is_binary(content) do
     content
     |> String.replace("$INSTANCE$host$", host)
+    |> String.replace("$INSTANCE$tld$", get_tld(host, "$INSTANCE$tld$"))
   end
 
   defp replace_instance_host(object, host) when is_map(object) do
@@ -1031,6 +1032,14 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
 
   defp replace_instance_host(value, _), do: value
 
+  defp get_tld(host, default) do
+    with [domain | _] <- String.split(host, ".") |> Enum.reverse() do
+      domain
+    else
+      _ -> default
+    end
+  end
+
   defp patch_content_map(%{"contentMap" => %{} = content_map}, host) do
     content_map
     |> Enum.map(fn {key, value} -> {key, replace_instance_host(value, host)} end)