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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2008 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\HTML\Helpers;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Document\HtmlDocument;
use Joomla\CMS\Factory;
use Joomla\CMS\Session\Session;
use Joomla\Utilities\ArrayHelper;

/**
 * Utility class for form elements
 *
 * @since  1.5
 */
abstract class Form
{
	/**
	 * Array containing information for loaded files.
	 *
	 * @var    array
	 *
	 * @since  3.8.0
	 */
	protected static $loaded = array();

/**
	 * Displays a hidden token field to reduce the risk of CSRF exploits
	 *
	 * Use in conjunction with Session::checkToken()
	 *
	 * @param   array  $attribs  Input element attributes.
	 *
	 * @return  string  A hidden input field with a token
	 *
	 * @see     Session::checkToken()
	 * @since   1.5
	 */
	public static function token(array $attribs = array())
	{
		$attributes = '';

if ($attribs !== array())
		{
			$attributes .= ' ' . ArrayHelper::toString($attribs);
		}

return '<input type="hidden" name="' . Session::getFormToken() . '" value="1"' . $attributes . '>';
	}

/**
	 * Add CSRF form token to Joomla script options that developers can get it by Javascript.
	 *
	 * @param   string  $name  The script option key name.
	 *
	 * @return  void
	 *
	 * @since   3.8.0
	 */
	public static function csrf($name = 'csrf.token')
	{
		if (isset(static::$loaded[__METHOD__][$name]))
		{
			return;
		}

/** @var HtmlDocument $doc */
		$doc = Factory::getDocument();

if (!$doc instanceof HtmlDocument || $doc->getType() !== 'html')
		{
			return;
		}

$doc->addScriptOptions($name, Session::getFormToken());

static::$loaded[__METHOD__][$name] = true;
	}
}