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<?php |
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/** |
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* Allows viewing posts on the frontend when the user is not logged in. |
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*/ |
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class Jetpack_Frame_Nonce_Preview { |
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static $instance = null; |
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/** |
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* Returns the single instance of the Jetpack_Frame_Nonce_Preview object |
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* |
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* @since 4.3.0 |
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* |
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* @return Jetpack_Frame_Nonce_Preview |
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**/ |
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public static function get_instance() { |
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if ( ! is_null( self::$instance ) ) { |
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return self::$instance; |
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} |
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return self::$instance = new Jetpack_Frame_Nonce_Preview(); |
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} |
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function __construct() { |
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if ( isset( $_GET['frame-nonce'] ) && ! is_admin() ) { |
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add_filter( 'pre_get_posts', array( $this, 'maybe_display_post' ) ); |
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} |
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// autosave previews are validated differently |
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if ( isset( $_GET[ 'frame-nonce' ] ) && isset( $_GET[ 'preview_id' ] ) && isset( $_GET[ 'preview_nonce' ] ) ) { |
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remove_action( 'init', '_show_post_preview' ); |
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add_action( 'init', array( $this, 'handle_autosave_nonce_validation' ) ); |
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} |
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} |
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/** |
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* Verify that frame nonce exists, and if so, validate the nonce by calling WP.com. |
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* |
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* @since 4.3.0 |
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* |
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* @return bool |
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*/ |
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public function is_frame_nonce_valid() { |
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if ( empty( $_GET[ 'frame-nonce' ] ) ) { |
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return false; |
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} |
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Jetpack::load_xml_rpc_client(); |
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$xml = new Jetpack_IXR_Client(); |
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$xml->query( 'jetpack.verifyFrameNonce', sanitize_key( $_GET['frame-nonce'] ) ); |
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if ( $xml->isError() ) { |
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return false; |
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} |
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return (bool) $xml->getResponse(); |
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} |
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/** |
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* Conditionally add a hook on posts_results if this is the main query, a preview, and singular. |
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* |
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* @since 4.3.0 |
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* |
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* @param WP_Query $query |
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* |
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* @return WP_Query |
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*/ |
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public function maybe_display_post( $query ) { |
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if ( |
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$query->is_main_query() && |
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$query->is_preview() && |
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$query->is_singular() |
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) { |
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add_filter( 'posts_results', array( $this, 'set_post_to_publish' ), 10, 2 ); |
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} |
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return $query; |
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} |
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/** |
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* Conditionally set the first post to 'publish' if the frame nonce is valid and there is a post. |
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* |
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* @since 4.3.0 |
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* |
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* @param array $posts |
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* |
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* @return array |
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*/ |
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public function set_post_to_publish( $posts ) { |
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remove_filter( 'posts_results', array( $this, 'set_post_to_publish' ), 10, 2 ); |
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if ( empty( $posts ) || is_user_logged_in() || ! $this->is_frame_nonce_valid() ) { |
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return $posts; |
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} |
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$posts[0]->post_status = 'publish'; |
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// Disable comments and pings for this post. |
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add_filter( 'comments_open', '__return_false' ); |
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add_filter( 'pings_open', '__return_false' ); |
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return $posts; |
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} |
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/** |
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* Handle validation for autosave preview request |
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* |
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* @since 4.7.0 |
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* |
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*/ |
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public function handle_autosave_nonce_validation() { |
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if ( ! $this->is_frame_nonce_valid() ) { |
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wp_die( __( 'Sorry, you are not allowed to preview drafts.', 'jetpack' ) ); |
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} |
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add_filter( 'the_preview', '_set_preview' ); |
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} |
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} |
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Jetpack_Frame_Nonce_Preview::get_instance(); |
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Automattic /
jetpack
The PSR-2 coding standard requires that all properties in a class have their visibility explicitly declared. If you declare a property using
the property is implicitly global.
To learn more about the PSR-2, please see the PHP-FIG site on the PSR-2.