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ðŸ“ ..
ðŸ“„ BooleanRule.php(738 B)
ðŸ“„ CalendarRule.php(1.95 KB)
ðŸ“„ CaptchaRule.php(2.1 KB)
ðŸ“„ ColorRule.php(2.05 KB)
ðŸ“„ CssIdentifierRule.php(2.85 KB)
ðŸ“„ EmailRule.php(6.36 KB)
ðŸ“„ EqualsRule.php(2.38 KB)
ðŸ“„ ExistsRule.php(2.16 KB)
ðŸ“„ FilePathRule.php(2.61 KB)
ðŸ“„ FolderPathExistsRule.php(2.28 KB)
ðŸ“„ ModuleLayoutRule.php(1.04 KB)
ðŸ“„ NotequalsRule.php(2.17 KB)
ðŸ“„ NumberRule.php(2.11 KB)
ðŸ“„ OptionsRule.php(2.8 KB)
ðŸ“„ PasswordRule.php(6.38 KB)
ðŸ“„ RulesRule.php(3.55 KB)
ðŸ“„ SubformRule.php(2.49 KB)
ðŸ“„ TelRule.php(3.13 KB)
ðŸ“„ TimeRule.php(5.04 KB)
ðŸ“„ UrlRule.php(4.38 KB)
ðŸ“„ UserIdRule.php(2.28 KB)
ðŸ“„ UsernameRule.php(2.22 KB)

Editing: FolderPathExistsRule.php

<?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;

defined('JPATH_PLATFORM') or die;

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

/**
 * 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 Folder::exists($pathCleaned);
	}
}

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