Add UserEnabledPlug.

lib/pleroma/plugs/user_enabled_plug.ex

@@ -0,0 +1,17 @@
+defmodule Pleroma.Plugs.UserEnabledPlug do
+  import Plug.Conn
+  alias Pleroma.User
+
+  def init(options) do
+    options
+  end
+
+  def call(%{assigns: %{user: %User{info: %{"deactivated" => true}}}} = conn, _) do
+    conn
+    |> assign(:user, nil)
+  end
+
+  def call(conn, _) do
+    conn
+  end
+end