pleroma/lib/pleroma/web/activity_pub/object_validators/types/recipients.ex

defmodule Pleroma.Web.ActivityPub.ObjectValidators.Types.Recipients do
  use Ecto.Type

  alias Pleroma.Web.ActivityPub.ObjectValidators.Types.ObjectID

  def type, do: {:array, ObjectID}

  def cast(object) when is_binary(object) do
    cast([object])
  end

  def cast(data) when is_list(data) do
    data
    |> Enum.reduce_while({:ok, []}, fn element, {:ok, list} ->
      case ObjectID.cast(element) do
        {:ok, id} ->
          {:cont, {:ok, [id | list]}}

        _ ->
          {:halt, :error}
      end
    end)
  end

  def cast(_) do
    :error
  end

  def dump(data) do
    {:ok, data}
  end

  def load(data) do
    {:ok, data}
  end
end