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   1  <?php
   2  /**
   3   * Feed API: WP_SimplePie_Sanitize_KSES class
   4   *
   5   * @package WordPress
   6   * @subpackage Feed
   7   * @since 4.7.0
   8   */
   9  
  10  /**
  11   * Core class used to implement SimplePie feed sanitization.
  12   *
  13   * Extends the SimplePie_Sanitize class to use KSES, because
  14   * we cannot universally count on DOMDocument being available.
  15   *
  16   * @since 3.5.0
  17   *
  18   * @see SimplePie_Sanitize
  19   */
  20  class WP_SimplePie_Sanitize_KSES extends SimplePie_Sanitize {
  21  
  22      /**
  23       * WordPress SimplePie sanitization using KSES.
  24       *
  25       * Sanitizes the incoming data, to ensure that it matches the type of data expected, using KSES.
  26       *
  27       * @since 3.5.0
  28       *
  29       * @param mixed   $data The data that needs to be sanitized.
  30       * @param int     $type The type of data that it's supposed to be.
  31       * @param string  $base Optional. The `xml:base` value to use when converting relative
  32       *                      URLs to absolute ones. Default empty.
  33       * @return mixed Sanitized data.
  34       */
  35  	public function sanitize( $data, $type, $base = '' ) {
  36          $data = trim( $data );
  37          if ( $type & SIMPLEPIE_CONSTRUCT_MAYBE_HTML ) {
  38              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 ) ) {
  39                  $type |= SIMPLEPIE_CONSTRUCT_HTML;
  40              } else {
  41                  $type |= SIMPLEPIE_CONSTRUCT_TEXT;
  42              }
  43          }
  44          if ( $type & SIMPLEPIE_CONSTRUCT_BASE64 ) {
  45              $data = base64_decode( $data );
  46          }
  47          if ( $type & ( SIMPLEPIE_CONSTRUCT_HTML | SIMPLEPIE_CONSTRUCT_XHTML ) ) {
  48              $data = wp_kses_post( $data );
  49              if ( 'UTF-8' !== $this->output_encoding ) {
  50                  $data = $this->registry->call( 'Misc', 'change_encoding', array( $data, 'UTF-8', $this->output_encoding ) );
  51              }
  52              return $data;
  53          } else {
  54              return parent::sanitize( $data, $type, $base );
  55          }
  56      }
  57  }