Do not boost if group is blocking poster

lib/pleroma/web/activity_pub/utils.ex

@@ -937,13 +937,19 @@ def get_existing_votes(actor, %{data: %{"id" => id}}) do
   end
 
   def maybe_handle_group_posts(activity) do
+    poster = User.get_cached_by_ap_id(activity.actor)
+
     mentions =
       activity.data["to"]
       |> Enum.filter(&(&1 != activity.actor))
 
     mentioned_local_groups =
       User.get_all_by_ap_id(mentions)
-      |> Enum.filter(&(&1.actor_type == "Group" and &1.local))
+      |> Enum.filter(fn user ->
+        user.actor_type == "Group" and
+          user.local and
+          not User.blocks?(user, poster)
+      end)
 
     mentioned_local_groups
     |> Enum.each(fn group ->

test/pleroma/web/activity_pub/side_effects_test.exs

@@ -984,5 +984,24 @@ test "remote group should not boost it", %{make_create: make_create, group: grou
       assert [announce] = get_announces_of_object(object)
       assert announce.actor == group.ap_id
     end
+
+    test "group should not boost it if group is blocking poster", %{
+      make_create: make_create,
+      group: group,
+      poster: poster
+    } do
+      {:ok, _} = CommonAPI.block(group, poster)
+      create_activity_data = make_create.([group])
+      {:ok, create_activity, _meta} = ActivityPub.persist(create_activity_data, local: false)
+
+      {:ok, _create_activity, _meta} =
+        SideEffects.handle(create_activity,
+          local: false,
+          object_data: create_activity_data["object"]
+        )
+
+      object = Object.normalize(create_activity, fetch: false)
+      assert [] = get_announces_of_object(object)
+    end
   end
 end

test/pleroma/web/common_api_test.exs

@@ -1883,5 +1883,13 @@ test "multiple groups mentioned", %{poster: poster, group: group, other_group: o
       announces = get_announces_of_object(post.object)
       assert [_, _] = announces
     end
+
+    test "it does not boost if group is blocking poster", %{poster: poster, group: group} do
+      {:ok, _} = CommonAPI.block(group, poster)
+      {:ok, post} = CommonAPI.post(poster, %{status: "hey @#{group.nickname}"})
+
+      announces = get_announces_of_object(post.object)
+      assert [] = announces
+    end
   end
 end