Do not stream out Announces to public timelines

lib/pleroma/activity/ir/topics.ex

@@ -29,7 +29,7 @@ defp generate_topics(object, activity) do
     ["user", "list"] ++ visibility_tags(object, activity)
   end
 
-  defp visibility_tags(object, activity) do
+  defp visibility_tags(object, %{data: %{"type" => "Create"}} = activity) do
     case Visibility.get_visibility(activity) do
       "public" ->
         if activity.local do
@@ -51,6 +51,10 @@ defp visibility_tags(object, activity) do
     end
   end
 
+  defp visibility_tags(_object, _activity) do
+    []
+  end
+
   defp item_creation_tags(tags, object, %{data: %{"type" => "Create"}} = activity) do
     tags ++
       remote_topics(activity) ++ hashtags_to_topics(object) ++ attachment_topics(object, activity)

test/pleroma/activity/ir/topics_test.exs

@@ -58,7 +58,7 @@ test "always add user and list topics" do
     setup do
       activity = %Activity{
         object: %Object{data: %{"type" => "Note"}},
-        data: %{"to" => [Pleroma.Constants.as_public()]}
+        data: %{"to" => [Pleroma.Constants.as_public()], "type" => "Create"}
       }
 
       {:ok, activity: activity}
@@ -137,6 +137,25 @@ test "local action doesn't produce public:remote topic", %{activity: activity} d
     end
   end
 
+  describe "public visibility Announces" do
+    setup do
+      activity = %Activity{
+        object: %Object{data: %{"attachment" => []}},
+        data: %{"type" => "Announce", "to" => [Pleroma.Constants.as_public()]}
+      }
+
+      {:ok, activity: activity}
+    end
+
+    test "does not generate public topics", %{activity: activity} do
+      topics = Topics.get_activity_topics(activity)
+
+      refute "public" in topics
+      refute "public:remote" in topics
+      refute "public:local" in topics
+    end
+  end
+
   describe "local-public visibility create events" do
     setup do
       activity = %Activity{
@@ -230,7 +249,11 @@ test "produces public:local:media topics", %{activity: activity} do
 
   describe "non-public visibility" do
     test "produces direct topic" do
-      activity = %Activity{object: %Object{data: %{"type" => "Note"}}, data: %{"to" => []}}
+      activity = %Activity{
+        object: %Object{data: %{"type" => "Note"}},
+        data: %{"to" => [], "type" => "Create"}
+      }
+
       topics = Topics.get_activity_topics(activity)
 
       assert Enum.member?(topics, "direct")