Allow local user to have group actor type

https://git.pleroma.social/pleroma/pleroma/-/issues/3205

lib/pleroma/constants.ex

@@ -76,6 +76,14 @@ defmodule Pleroma.Constants do
     ]
   )
 
+  const(allowed_user_actor_types,
+    do: [
+      "Person",
+      "Service",
+      "Group"
+    ]
+  )
+
   # basic regex, just there to weed out potential mistakes
   # https://datatracker.ietf.org/doc/html/rfc2045#section-5.1
   const(mime_regex,

lib/pleroma/user.ex

@@ -39,6 +39,7 @@ defmodule Pleroma.User do
   alias Pleroma.Workers.BackgroundWorker
 
   require Logger
+  require Pleroma.Constants
 
   @type t :: %__MODULE__{}
   @type account_status ::
@@ -579,7 +580,7 @@ def update_changeset(struct, params \\ %{}) do
     |> validate_format(:nickname, local_nickname_regex())
     |> validate_length(:bio, max: bio_limit)
     |> validate_length(:name, min: 1, max: name_limit)
-    |> validate_inclusion(:actor_type, ["Person", "Service"])
+    |> validate_inclusion(:actor_type, Pleroma.Constants.allowed_user_actor_types())
     |> put_fields()
     |> put_emoji()
     |> put_change_if_present(:bio, &{:ok, parse_bio(&1, struct)})

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

@@ -212,7 +212,7 @@ defp do_render("show.json", %{user: user} = opts) do
         do: user.follower_count,
         else: 0
 
-    bot = user.actor_type == "Service"
+    bot = is_bot?(user)
 
     emojis =
       Enum.map(user.emoji, fn {shortcode, raw_url} ->
@@ -468,4 +468,12 @@ defp maybe_show_birthday(data, _, _) do
 
   defp image_url(%{"url" => [%{"href" => href} | _]}), do: href
   defp image_url(_), do: nil
+
+  defp is_bot?(user) do
+    # Because older and/or Mastodon clients may not recognize a Group actor properly,
+    # and currently the group actor can only boost things, we should let these clients
+    # think groups are bots.
+    # See https://git.pleroma.social/pleroma/pleroma-meta/-/issues/14
+    user.actor_type == "Service" || user.actor_type == "Group"
+  end
 end

test/pleroma/web/mastodon_api/update_credentials_test.exs

@@ -732,4 +732,20 @@ test "actor_type field has a higher priority than bot", %{conn: conn} do
       assert account["source"]["pleroma"]["actor_type"] == "Person"
     end
   end
+
+  describe "Mark account as group" do
+    setup do: oauth_access(["write:accounts"])
+    setup :request_content_type
+
+    test "changing actor_type to Group makes account a Group and enables bot indicator for backward compatibility",
+         %{conn: conn} do
+      account =
+        conn
+        |> patch("/api/v1/accounts/update_credentials", %{actor_type: "Group"})
+        |> json_response_and_validate_schema(200)
+
+      assert account["bot"]
+      assert account["source"]["pleroma"]["actor_type"] == "Group"
+    end
+  end
 end