Fix tagpolicy to also work with Update

Objects who got updated would just pass the TagPolicy, undoing the moderation that was set in place for the Actor.
Now we check not only for Create activities, but also Update activities.

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)
 
@@ -52,13 +52,13 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicy do
   defp process_tag(
          "mrf_tag:force-unlisted",
          %{
-           "type" => "Create",
+           "type" => type,
            "to" => to,
            "cc" => cc,
            "actor" => actor,
            "object" => object
          } = message
-       ) do
+       ) when type in ["Create", "Update"] do
     user = User.get_cached_by_ap_id(actor)
 
     if Enum.member?(to, Pleroma.Constants.as_public()) do
@@ -85,13 +85,13 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicy do
   defp process_tag(
          "mrf_tag:sandbox",
          %{
-           "type" => "Create",
+           "type" => type,
            "to" => to,
            "cc" => cc,
            "actor" => actor,
            "object" => object
          } = message
-       ) do
+       ) when type in ["Create", "Update"] do
     user = User.get_cached_by_ap_id(actor)
 
     if Enum.member?(to, Pleroma.Constants.as_public()) or
@@ -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

@@ -53,7 +53,24 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicyTest do
         "cc" => ["d"]
       }
 
+      edit_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{},
+        "to" => [@public, "f"],
+        "cc" => [@public, "d"]
+      }
+
+      edit_expect_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{"to" => ["f", actor.follower_address], "cc" => ["d"]},
+        "to" => ["f", actor.follower_address],
+        "cc" => ["d"]
+      }
+
       assert TagPolicy.filter(message) == {:ok, except_message}
+      assert TagPolicy.filter(edit_message) == {:ok, edit_expect_message}
     end
   end
 
@@ -77,7 +94,24 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicyTest do
         "cc" => ["d", @public]
       }
 
+      edit_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{},
+        "to" => [@public, "f"],
+        "cc" => [actor.follower_address, "d"]
+      }
+
+      edit_expect_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{"to" => ["f", actor.follower_address], "cc" => ["d", @public]},
+        "to" => ["f", actor.follower_address],
+        "cc" => ["d", @public]
+      }
+
       assert TagPolicy.filter(message) == {:ok, except_message}
+      assert TagPolicy.filter(edit_message) == {:ok, edit_expect_message}
     end
   end
 
@@ -97,7 +131,20 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicyTest do
         "object" => %{}
       }
 
+      edit_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{"attachment" => ["file1"]}
+      }
+
+      edit_expect_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{}
+      }
+
       assert TagPolicy.filter(message) == {:ok, except_message}
+      assert TagPolicy.filter(edit_message) == {:ok, edit_expect_message}
     end
   end
 
@@ -117,7 +164,20 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicyTest do
         "object" => %{"tag" => ["test"], "attachment" => ["file1"], "sensitive" => true}
       }
 
+      edit_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{"tag" => ["test"], "attachment" => ["file1"]}
+      }
+
+      edit_expect_message = %{
+        "actor" => actor.ap_id,
+        "type" => "Update",
+        "object" => %{"tag" => ["test"], "attachment" => ["file1"], "sensitive" => true}
+      }
+
       assert TagPolicy.filter(message) == {:ok, except_message}
+      assert TagPolicy.filter(edit_message) == {:ok, edit_expect_message}
     end
   end
 end