StatusView: clear MSB on calculated conversation_id

This field seems to be a left-over from the StatusNet era.
If your application uses `pleroma.conversation_id`: this field is
deprecated.

It is currently stubbed instead by doing a CRC32 of the context, and
clearing the MSB to avoid overflow exceptions with signed integers on
the different clients using this field (Java/Kotlin code, mostly; see
Husky and probably other mobile clients.)

This should be removed in a future version of Pleroma. Pleroma-FE
currently depends on this field, as well.

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -57,8 +57,19 @@ defp get_replied_to_activities(activities) do
     end)
   end
 
-  defp get_context_id(%{data: %{"context" => context}}) when is_binary(context),
-    do: :erlang.crc32(context)
+  # DEPRECATED This field seems to be a left-over from the StatusNet era.
+  # If your application uses `pleroma.conversation_id`: this field is deprecated.
+  # It is currently stubbed instead by doing a CRC32 of the context, and
+  # clearing the MSB to avoid overflow exceptions with signed integers on the
+  # different clients using this field (Java/Kotlin code, mostly; see Husky.)
+  # This should be removed in a future version of Pleroma. Pleroma-FE currently
+  # depends on this field, as well.
+  defp get_context_id(%{data: %{"context" => context}}) when is_binary(context) do
+    use Bitwise
+
+    :erlang.crc32(context)
+    |> band(bnot(0x8000_0000))
+  end
 
   defp get_context_id(_), do: nil
 

test/pleroma/web/common_api/utils_test.exs

@@ -4,7 +4,6 @@
 
 defmodule Pleroma.Web.CommonAPI.UtilsTest do
   alias Pleroma.Builders.UserBuilder
-  alias Pleroma.Object
   alias Pleroma.Web.CommonAPI
   alias Pleroma.Web.CommonAPI.ActivityDraft
   alias Pleroma.Web.CommonAPI.Utils

test/pleroma/web/mastodon_api/views/status_view_test.exs

@@ -14,7 +14,6 @@ defmodule Pleroma.Web.MastodonAPI.StatusViewTest do
   alias Pleroma.User
   alias Pleroma.UserRelationship
   alias Pleroma.Web.CommonAPI
-  alias Pleroma.Web.CommonAPI.Utils
   alias Pleroma.Web.MastodonAPI.AccountView
   alias Pleroma.Web.MastodonAPI.StatusView
 
@@ -226,7 +225,7 @@ test "a note activity" do
     object_data = Object.normalize(note, fetch: false).data
     user = User.get_cached_by_ap_id(note.data["actor"])
 
-    convo_id = :erlang.crc32(object_data["context"])
+    convo_id = :erlang.crc32(object_data["context"]) |> Bitwise.band(Bitwise.bnot(0x8000_0000))
 
     status = StatusView.render("show.json", %{activity: note})