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<?php

/**
 * Joomla! Content Management System
 *
 * @copyright   (C) 2021 Open Source Matters, Inc.
<https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see
LICENSE.txt
 */

namespace Joomla\CMS\Form\Rule;

use Joomla\CMS\Form\Form;
use Joomla\Filesystem\Path;
use Joomla\Registry\Registry;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Form Rule class for the Joomla CMS.
 *
 * @since  4.0.0
 */
class FolderPathExistsRule extends FilePathRule
{
    /**
     * Method to test if the folder path is valid and points to an existing
folder below the Joomla root
     *
     * @param   \SimpleXMLElement  $element  The SimpleXMLElement object
representing the `<field>` tag for the form field object.
     * @param   mixed              $value    The form field value to
validate.
     * @param   string             $group    The field name group control
value. This acts as an array container for the field.
     *                                       For example if the field has
name="foo" and the group value is set to "bar" then the
     *                                       full field name would end up
being "bar[foo]".
     * @param   ?Registry          $input    An optional Registry object
with the entire data set to validate against the entire form.
     * @param   ?Form              $form     The form object for which the
field is being tested.
     *
     * @return  boolean  True if the value is valid and points to an
existing folder below the Joomla root, false otherwise.
     *
     * @since   4.0.0
     */
    public function test(\SimpleXMLElement $element, $value, $group = null,
Registry $input = null, Form $form = null)
    {
        if (!parent::test($element, $value, $group, $input, $form)) {
            return false;
        }

        // If the field is empty and not required so the previous test
hasn't failed, the field is valid.
        if ($value === '' || $value === null) {
            return true;
        }

        // Spaces only would result in Joomla root which is not allowed
        if (!trim($value)) {
            return false;
        }

        $pathCleaned = rtrim(Path::clean(JPATH_ROOT . '/' .
$value), \DIRECTORY_SEPARATOR);
        $rootCleaned = rtrim(Path::clean(JPATH_ROOT),
\DIRECTORY_SEPARATOR);

        // JPATH_ROOT is not allowed
        if ($pathCleaned === $rootCleaned) {
            return false;
        }

        return is_dir(Path::clean($pathCleaned));
    }
}