Split steal_emoji function for better readability

lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex

@@ -33,13 +33,7 @@ defp reject_emoji?({shortcode, _url}, installed_emoji) do
     !valid_shortcode? or rejected_shortcode? or emoji_installed?
   end
 
-  defp steal_emoji({shortcode, url}, emoji_dir_path) do
+  defp steal_emoji(%{} = response, {shortcode, url}, emoji_dir_path) do
-    url = Pleroma.Web.MediaProxy.url(url)
-
-    with {:ok, %{status: status} = response} when status in 200..299 <- Pleroma.HTTP.get(url) do
-      size_limit = Config.get([:mrf_steal_emoji, :size_limit], 50_000)
-
-      if byte_size(response.body) <= size_limit do
     extension =
       url
       |> URI.parse()
@@ -58,6 +52,16 @@ defp steal_emoji({shortcode, url}, emoji_dir_path) do
         Logger.warning("MRF.StealEmojiPolicy: Failed to write to #{file_path}: #{inspect(e)}")
         nil
     end
+  end
+
+  defp maybe_steal_emoji({shortcode, url}, emoji_dir_path) do
+    url = Pleroma.Web.MediaProxy.url(url)
+
+    with {:ok, %{status: status} = response} when status in 200..299 <- Pleroma.HTTP.get(url) do
+      size_limit = Config.get([:mrf_steal_emoji, :size_limit], 50_000)
+
+      if byte_size(response.body) <= size_limit do
+        steal_emoji(response, {shortcode, url}, emoji_dir_path)
       else
         Logger.debug(
           "MRF.StealEmojiPolicy: :#{shortcode}: at #{url} (#{byte_size(response.body)} B) over size limit (#{size_limit} B)"
@@ -90,7 +94,7 @@ def filter(%{"object" => %{"emoji" => foreign_emojis, "actor" => actor}} = messa
       new_emojis =
         foreign_emojis
         |> Enum.reject(&reject_emoji?(&1, installed_emoji))
-        |> Enum.map(&steal_emoji(&1, emoji_dir_path))
+        |> Enum.map(&maybe_steal_emoji(&1, emoji_dir_path))
         |> Enum.filter(& &1)
 
       if !Enum.empty?(new_emojis) do