Make TagPolicy Update-aware

This is inspired by d5828f1c5e

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

@@ -27,22 +27,22 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicy do
   defp process_tag(
          "mrf_tag:media-force-nsfw",
          %{
-           "type" => "Create",
+           "type" => type,
            "object" => %{"attachment" => child_attachment}
          } = message
        )
-       when length(child_attachment) > 0 do
+       when length(child_attachment) > 0 and type in ["Create", "Update"] do
     {:ok, Kernel.put_in(message, ["object", "sensitive"], true)}
   end
 
   defp process_tag(
          "mrf_tag:media-strip",
          %{
-           "type" => "Create",
+           "type" => type,
            "object" => %{"attachment" => child_attachment} = object
          } = message
        )
-       when length(child_attachment) > 0 do
+       when length(child_attachment) > 0 and type in ["Create", "Update"] do
     object = Map.delete(object, "attachment")
     message = Map.put(message, "object", object)
 
@@ -152,7 +152,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicy do
     do: filter_message(target_actor, message)
 
   @impl true
-  def filter(%{"actor" => actor, "type" => "Create"} = message),
+  def filter(%{"actor" => actor, "type" => type} = message) when type in ["Create", "Update"],
     do: filter_message(actor, message)
 
   @impl true

test/pleroma/web/activity_pub/mrf/tag_policy_test.exs

@@ -99,6 +99,24 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicyTest do
 
       assert TagPolicy.filter(message) == {:ok, except_message}
     end
+
+    test "removes attachments in Updates" do
+      actor = insert(:user, tags: ["mrf_tag:media-strip"])
+
+      message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{"attachment" => ["file1"]}
+      }
+
+      except_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{}
+      }
+
+      assert TagPolicy.filter(message) == {:ok, except_message}
+    end
   end
 
   describe "mrf_tag:media-force-nsfw" do
@@ -119,5 +137,23 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicyTest do
 
       assert TagPolicy.filter(message) == {:ok, except_message}
     end
+
+    test "Mark as sensitive on presence of attachments in Updates" do
+      actor = insert(:user, tags: ["mrf_tag:media-force-nsfw"])
+
+      message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{"tag" => ["test"], "attachment" => ["file1"]}
+      }
+
+      except_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{"tag" => ["test"], "attachment" => ["file1"], "sensitive" => true}
+      }
+
+      assert TagPolicy.filter(message) == {:ok, except_message}
+    end
   end
 end