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ðŸ“„ IntarrayFilter.php(1.89 KB)
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ðŸ“„ UrlFilter.php(3.16 KB)

Editing: UrlFilter.php

<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Form\Filter;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Filter\InputFilter;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormFilterInterface;
use Joomla\CMS\String\PunycodeHelper;
use Joomla\CMS\Uri\Uri;
use Joomla\Registry\Registry;

/**
 * Form Filter class for URLs
 *
 * @since  4.0.0
 */
class UrlFilter implements FormFilterInterface
{
	/**
	 * Method to filter a field value.
	 *
	 * @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  mixed   The filtered value.
	 *
	 * @since   4.0.0
	 */
	public function filter(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
	{
		if (empty($value))
		{
			return false;
		}

// This cleans some of the more dangerous characters but leaves special characters that are valid.
		$value = InputFilter::getInstance()->clean($value, 'html');
		$value = trim($value);

// <>" are never valid in a uri see https://www.ietf.org/rfc/rfc1738.txt
		$value = str_replace(array('<', '>', '"'), '', $value);

// Check for a protocol
		$protocol = parse_url($value, PHP_URL_SCHEME);

// If there is no protocol and the relative option is not specified,
		// we assume that it is an external URL and prepend http://
		if (((string) $element['type'] === 'url' && !$protocol && !$element['relative'])
			|| (!(string) $element['type'] === 'url' && !$protocol))
		{
			$protocol = 'http';

// If it looks like an internal link, then add the root.
			if (substr($value, 0, 9) === 'index.php')
			{
				$value = Uri::root() . $value;
			}

// Otherwise we treat it as an external link.
			else
			{
				// Put the url back together.
				$value = $protocol . '://' . $value;
			}
		}

// If relative URLS are allowed we assume that URLs without protocols are internal.
		elseif (!$protocol && $element['relative'])
		{
			$host = Uri::getInstance('SERVER')->getHost();

// If it starts with the host string, just prepend the protocol.
			if (substr($value, 0) === $host)
			{
				$value = 'http://' . $value;
			}

// Otherwise if it doesn't start with "/" prepend the prefix of the current site.
			elseif (substr($value, 0, 1) !== '/')
			{
				$value = Uri::root(true) . '/' . $value;
			}
		}

$value = PunycodeHelper::urlToPunycode($value);

return $value;
	}
}

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