nextcloud-server/plugins/publiclink/makelink.php

<?php
$RUNTIME_NOAPPS=true; //no need to load the apps

require_once '../../lib/base.php';

require_once 'lib_public.php';

$path=$_GET['path'];
$expire=(isset($_GET['expire']))?$_GET['expire']:0;

$link=new OC_PublicLink($path,$expire);
echo $link->getToken();
?>