nextcloud-server/apps/files/js/publiclistview.php

<?php
/**
 * Copyright (c) 2013 Lukas Reschke <lukas@statuscode.ch>
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 * See the COPYING-README file.
 */

// Set the content type to Javascript
header("Content-type: text/javascript");

// Disallow caching
header("Cache-Control: no-cache, must-revalidate"); 
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); 

if ( array_key_exists('disableSharing', $_) && $_['disableSharing'] == true )  {
	echo "var disableSharing = true;";
} else {
	echo "var disableSharing = false;";
}