private static function get_allowed_protocols()
{
if (isset(self::$allowed_protocols)) {
return self::$allowed_protocols;
}
$blacklisted_protocols = self::get_blacklisted_protocols();
$allowed_protocols = wp_allowed_protocols();
$allowed_protocols = array_diff_key($allowed_protocols, array_fill_keys($blacklisted_protocols, false));
self::$allowed_protocols = $allowed_protocols;
return $allowed_protocols;
}
public function transform()
{
$content = $this->original_content;
$content = apply_filters('the_content', $content);
// We run kses before AMP conversion due to a kses bug which doesn't allow hyphens (#34105-core).
// Our custom kses handler strips out all not-allowed stuff and leaves in stuff that will be converted (like iframe, img, audio, video).
// Technically, conversion should catch the tags so we shouldn't need to run it after anyway.
$content = AMP_KSES::strip($content);
// Convert HTML to AMP
// see https://github.com/ampproject/amphtml/blob/master/spec/amp-html-format.md#html-tags)
$img_converter = new AMP_Img_Converter();
$content = $img_converter->convert($content, array('layout' => 'responsive'));
return $content;
}
