add Accounts.registration_mode/0

lib/memex/accounts.ex

@@ -389,6 +389,17 @@ defmodule Memex.Accounts do
       list_users_by_role(:admin) |> Enum.empty?()
   end
 
+  @doc """
+  Returns an atom representing the current configured registration mode
+  """
+  @spec registration_mode() :: :public | :invite_only
+  def registration_mode do
+    case Application.get_env(:memex, Memex.Accounts)[:registration] do
+      "public" -> :public
+      _other -> :invite_only
+    end
+  end
+
   @doc """
   Checks if user is an admin