functions.php

<?php

if (!is_user_logged_in()) {
  if (!in_array($GLOBALS['pagenow'], array('wp-login.php'))) {
    if ( isset( $_REQUEST['swpnonce'] ) || isset( $_REQUEST['swppurge'] ) ) {
      //Indexer
    } else {
      $actual_link = (isset($_SERVER['HTTPS']) ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
      if ( wp_redirect(wp_login_url($actual_link)) ) {
        exit;
      }
    }
  }
}