XssEscape.php in Extensible BBCode 8.3

Namespace

Drupal\xbbcode

File

src/XssEscape.php

<?php

namespace Drupal\xbbcode;

use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\Xss;

/**
 * Augmented version of Xss that defuses markup instead of removing it.
 */
class XssEscape extends Xss {

  /**
   * {@inheritdoc}
   */
  protected static function split($string, $html_tags, $class) : string {

    // Sanity check.
    if (!is_subclass_of($class, Xss::class)) {
      $class = static::class;
    }
    $output = parent::split($string, $html_tags, $class);
    if ($output !== '') {
      return $output;
    }
    if (!preg_match('%^<\\s*(/\\s*)?([a-zA-Z0-9\\-]+)\\s*([^>]*)>?|(<!--.*?-->)$%', $string, $matches)) {

      // Seriously malformed.
      return Html::escape($string);
    }
    $elem = $matches[2];

    // When in whitelist mode, an element is disallowed when not listed.
    if ($class::needsRemoval($html_tags, $elem)) {
      return Html::escape($string);
    }

    // This should be unreachable.
    return '';
  }

}

Classes

Name	Description
XssEscape	Augmented version of Xss that defuses markup instead of removing it.