1 files changed, 11 insertions, 0 deletions
diff --git a/lib/pleroma/web/activity_pub/mrf.ex b/lib/pleroma/web/activity_pub/mrf.ex
index 89037ade7..a880b023f 100644
--- a/lib/pleroma/web/activity_pub/mrf.ex
+++ b/lib/pleroma/web/activity_pub/mrf.ex
@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.MRF do
   require Logger
+  import Pleroma.Web.Utils.Guards, only: [not_empty_string: 1]
 
   @behaviour Pleroma.Web.ActivityPub.MRF.PipelineFiltering
 
@@ -110,6 +111,16 @@ defmodule Pleroma.Web.ActivityPub.MRF do
     end)
   end
 
+  @spec normalize_instance_list(list()) :: [{String.t(), String.t()}]
+  def normalize_instance_list(list) do
+    Enum.map(list, fn
+      {host, reason} when not_empty_string(host) and not_empty_string(reason) -> {host, reason}
+      {host, _reason} when not_empty_string(host) -> {host, ""}
+      host when not_empty_string(host) -> {host, ""}
+      value -> raise "Invalid MRF config: #{inspect(value)}"
+    end)
+  end
+
   def describe(policies) do
     {:ok, policy_configs} =
       policies