From ce517ff4e5a9cc144853ec8112bfac2a38a3a68a Mon Sep 17 00:00:00 2001
From: ilja <git@ilja.space>
Date: Thu, 8 Dec 2022 21:53:42 +0100
Subject: [PATCH] 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.
---
 .../web/activity_pub/mrf/tag_policy.ex        | 18 +++---
 .../web/activity_pub/mrf/tag_policy_test.exs  | 60 +++++++++++++++++++
 2 files changed, 69 insertions(+), 9 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/tag_policy.ex b/lib/pleroma/web/activity_pub/mrf/tag_policy.ex
index 56ae654f2..65a358c59 100644
--- a/lib/pleroma/web/activity_pub/mrf/tag_policy.ex
+++ b/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
diff --git a/test/pleroma/web/activity_pub/mrf/tag_policy_test.exs b/test/pleroma/web/activity_pub/mrf/tag_policy_test.exs
index faaadff79..0c84b5bf3 100644
--- a/test/pleroma/web/activity_pub/mrf/tag_policy_test.exs
+++ b/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