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<?php

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/**

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* Facebook embeds

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* @package automattic/jetpack

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if ( ! defined( 'ABSPATH' ) ) {

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exit( 0 );

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}

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define( 'JETPACK_FACEBOOK_EMBED_REGEX', '#^https?://(www.)?facebook\.com/([^/]+)/(posts|photos)/([^/]+)?#' );

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define( 'JETPACK_FACEBOOK_ALTERNATE_EMBED_REGEX', '#^https?://(www.)?facebook\.com/permalink.php\?([^\s]+)#' );

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define( 'JETPACK_FACEBOOK_PHOTO_EMBED_REGEX', '#^https?://(www.)?facebook\.com/photo.php\?([^\s]+)#' );

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define( 'JETPACK_FACEBOOK_PHOTO_ALTERNATE_EMBED_REGEX', '#^https?://(www.)?facebook\.com/([^/]+)/photos/([^/]+)?#' );

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define( 'JETPACK_FACEBOOK_VIDEO_EMBED_REGEX', '#^https?://(www.)?facebook\.com/(?:video.php|watch\/?)\?([^\s]+)#' );

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define( 'JETPACK_FACEBOOK_VIDEO_ALTERNATE_EMBED_REGEX', '#^https?://(www.)?facebook\.com/([^/]+)/videos/([^/]+)?#' );

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* Example URL: https://www.facebook.com/VenusWilliams/posts/10151647007373076

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wp_embed_register_handler( 'facebook', JETPACK_FACEBOOK_EMBED_REGEX, 'jetpack_facebook_embed_handler' );

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* Example URL: https://www.facebook.com/permalink.php?id=222622504529111&story_fbid=559431180743788

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wp_embed_register_handler( 'facebook-alternate', JETPACK_FACEBOOK_ALTERNATE_EMBED_REGEX, 'jetpack_facebook_embed_handler' );

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* Photos are handled on a different endpoint; e.g. https://www.facebook.com/photo.php?fbid=10151609960150073&set=a.398410140072.163165.106666030072&type=1

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wp_embed_register_handler( 'facebook-photo', JETPACK_FACEBOOK_PHOTO_EMBED_REGEX, 'jetpack_facebook_embed_handler' );

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* Photos (from pages for example) can be at

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wp_embed_register_handler( 'facebook-alternate-photo', JETPACK_FACEBOOK_PHOTO_ALTERNATE_EMBED_REGEX, 'jetpack_facebook_embed_handler' );

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* Videos

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* Formats:

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* https://www.facebook.com/video.php?v=2836814009877992

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* https://www.facebook.com/watch/?v=2836814009877992

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wp_embed_register_handler( 'facebook-video', JETPACK_FACEBOOK_VIDEO_EMBED_REGEX, 'jetpack_facebook_embed_handler' );

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* Videos https://www.facebook.com/WhiteHouse/videos/10153398464269238/

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wp_embed_register_handler( 'facebook-alternate-video', JETPACK_FACEBOOK_VIDEO_ALTERNATE_EMBED_REGEX, 'jetpack_facebook_embed_handler' );

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/**

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* Callback to modify output of embedded Facebook posts.

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* @param array $matches Regex partial matches against the URL passed.

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* @param array $attr Attributes received in embed response.

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* @param string $url Requested URL to be embedded.

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* @return string Facebook embed markup.

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function jetpack_facebook_embed_handler( $matches, $attr, $url ) {

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// This is a stop-gap solution until Facebook hopefully resolves this ticket

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// https://developers.facebook.com/community/threads/1675075423353415/?post_id=1675075426686748

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$extra_styles = 'style="background-color: #fff; display: inline-block;"';

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if (

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str_contains( $url, 'video.php' )

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|| str_contains( $url, '/videos/' )

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|| str_contains( $url, '/watch' )

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) {

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$embed = sprintf(

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'<div class="fb-video" data-allowfullscreen="true" data-href="%1$s" %2$s></div>',

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esc_url( $url ),

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$extra_styles

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);

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} else {

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$width = 552; // As of 01/2017, the default width of Facebook embeds when no width attribute provided.

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global $content_width;

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if ( is_numeric( $content_width ) && $content_width > 0 ) {

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$width = min( $width, $content_width );

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}

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$embed = sprintf(

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'<div class="fb-post" data-href="%1$s" data-width="%2$s" %3$s></div>',

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esc_url( $url ),

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esc_attr( $width ),

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$extra_styles

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);

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}

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// Skip rendering scripts in an AMP context.

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if ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() ) {

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return $embed;

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}

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// since Facebook is a faux embed, we need to load the JS SDK in the wpview embed iframe.

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if (

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defined( 'DOING_AJAX' )

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&& DOING_AJAX

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// No need to check for a nonce here, that's already handled by Core further up.

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&& ! empty( $_POST['action'] ) // phpcs:ignore WordPress.Security.NonceVerification.Missing

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&& 'parse-embed' === $_POST['action'] // phpcs:ignore WordPress.Security.NonceVerification.Missing

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) {

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ob_start();

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wp_scripts()->do_items( array( 'jetpack-facebook-embed' ) );

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$scripts = ob_get_clean();

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return $embed . $scripts;

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} else {

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wp_enqueue_script( 'jetpack-facebook-embed' );

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return $embed;

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}

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}

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/**

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* Shortcode handler.

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* @param array $atts Shortcode attributes.

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function jetpack_facebook_shortcode_handler( $atts ) {

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global $wp_embed;

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if ( empty( $atts['url'] ) ) {

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return;

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}

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if ( ! preg_match( JETPACK_FACEBOOK_EMBED_REGEX, $atts['url'] )

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&& ! preg_match( JETPACK_FACEBOOK_PHOTO_EMBED_REGEX, $atts['url'] )

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&& ! preg_match( JETPACK_FACEBOOK_VIDEO_EMBED_REGEX, $atts['url'] )

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&& ! preg_match( JETPACK_FACEBOOK_VIDEO_ALTERNATE_EMBED_REGEX, $atts['url'] ) ) {

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return;

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}

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return $wp_embed->shortcode( $atts, $atts['url'] );

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}

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add_shortcode( 'facebook', 'jetpack_facebook_shortcode_handler' );

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/**

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* Embed Reversal for Facebook

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* Hooked to pre_kses, converts an embed code from www.facebook.com to an oEmbeddable URL.

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* @param string $content Post content.

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* @return string The filtered or the original content.

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**/

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function jetpack_facebook_embed_reversal( $content ) {

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if ( ! is_string( $content ) || false === stripos( $content, 'https://www.facebook.com/plugins/post.php' ) ) {

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return $content;

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}

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* Sample embed code:

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* <iframe src="https://www.facebook.com/plugins/post.php?href=https%3A%2F%2Fwww.facebook.com%2Ftechcrunch%2Fposts%2Fpfbid0997g1PXQKfyFNHNTiCgaCFevt3PRFMaUBBB9eEFPR5NsXCv8EXxBw3p9bBYezWkHl&show_text=true&width=500" width="500" height="504" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowfullscreen="true" allow="autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share"></iframe>

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$regexes = array();

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$regexes[] = '#<iframe[^>]+?src="((?:https?:)?//(?:www\.)?facebook\.com/plugins/post\.php\?[^"]+)"[^>]*?>\s*?</iframe>#i';

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$regexes[] = '#<iframe[^&]+?src="((?:https?:)?//(?:www\.)?facebook\.com/plugins/post\.php\?[^"]+)"[^&]*?>\s*?</iframe>#i';

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foreach ( $regexes as $regex ) {

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if ( ! preg_match_all( $regex, $content, $matches, PREG_SET_ORDER ) ) {

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continue;

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}

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foreach ( $matches as $match ) {

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if ( ! preg_match( '#(https?:)?//(?:www\.)?facebook\.com/plugins/post.php([^/]*)#i', $match[1], $url_matches ) ) {

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continue;

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}

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$src_url = $url_matches[0];

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$parsed_url = wp_parse_url( $src_url );

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if ( empty( $parsed_url['query'] ) ) {

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continue;

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}

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$query_args = array();

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wp_parse_str( $parsed_url['query'], $query_args );

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if ( empty( $query_args['href'] ) ) {

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continue;

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}

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// Since we support Facebook via oEmbed, we simply leave a link on a line by itself.

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$replace_regex = sprintf( '#\s*%s\s*#', preg_quote( $match[0], '#' ) );

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$url = esc_url( $query_args['href'] );

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$content = preg_replace( $replace_regex, sprintf( "\n\n%s\n\n", $url ), $content );

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/** This action is documented in modules/shortcodes/youtube.php */

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do_action( 'jetpack_embed_to_shortcode', 'facebook', $url );

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}

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}

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return $content;

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}

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/**

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* Embed reversal: Convert an embed code from Facebook.com to an oEmbeddable URL.

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if ( jetpack_shortcodes_should_hook_pre_kses() ) {

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add_filter( 'pre_kses', 'jetpack_facebook_embed_reversal' );

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}

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