<?php

/**

 * Feed API: WP_SimplePie_Sanitize_KSES class

 *

 * @package WordPress

 * @subpackage Feed

 * @since 4.7.0

 */

/**

 * Core class used to implement SimpliePie feed sanitization.

 *

 * Extends the SimplePie_Sanitize class to use KSES, because

 * we cannot universally count on DOMDocument being available.

 *

 * @since 3.5.0

 *

 * @see SimplePie_Sanitize

 */

class WP_SimplePie_Sanitize_KSES extends SimplePie_Sanitize {

	/**

	 * WordPress SimplePie sanitization using KSES.

	 *

	 * Sanitizes the incoming data, to ensure that it matches the type of data expected, using KSES.

	 *

	 * @since 3.5.0

	 *

	 * @param mixed   $data The data that needs to be sanitized.

	 * @param integer $type The type of data that it's supposed to be.

	 * @param string  $base Optional. The `xml:base` value to use when converting relative

	 *                      URLs to absolute ones. Default empty.

	 * @return mixed Sanitized data.

	 */

	public function sanitize( $data, $type, $base = '' ) {

		$data = trim( $data );

		if ( $type & SIMPLEPIE_CONSTRUCT_MAYBE_HTML ) {

			if (preg_match('/(&(#(x[0-9a-fA-F]+|[0-9]+)|[a-zA-Z0-9]+)|<\/[A-Za-z][^\x09\x0A\x0B\x0C\x0D\x20\x2F\x3E]*' . SIMPLEPIE_PCRE_HTML_ATTRIBUTE . '>)/', $data)) {

				$type |= SIMPLEPIE_CONSTRUCT_HTML;

			}

			else {

				$type |= SIMPLEPIE_CONSTRUCT_TEXT;

			}

		}

		if ( $type & SIMPLEPIE_CONSTRUCT_BASE64 ) {

			$data = base64_decode( $data );

		}

		if ( $type & ( SIMPLEPIE_CONSTRUCT_HTML | SIMPLEPIE_CONSTRUCT_XHTML ) ) {

			$data = wp_kses_post( $data );

			if ( $this->output_encoding !== 'UTF-8' ) {

				$data = $this->registry->call( 'Misc', 'change_encoding', array( $data, 'UTF-8', $this->output_encoding ) );

			}

			return $data;

		} else {

			return parent::sanitize( $data, $type, $base );

		}

	}

}