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facebook.php
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<?php /** * Facebook embeds * * @package automattic/jetpack */ if ( ! defined( 'ABSPATH' ) ) { exit( 0 ); } define( 'JETPACK_FACEBOOK_EMBED_REGEX', '#^https?://(www.)?facebook\.com/([^/]+)/(posts|photos)/([^/]+)?#' ); define( 'JETPACK_FACEBOOK_ALTERNATE_EMBED_REGEX', '#^https?://(www.)?facebook\.com/permalink.php\?([^\s]+)#' ); define( 'JETPACK_FACEBOOK_PHOTO_EMBED_REGEX', '#^https?://(www.)?facebook\.com/photo.php\?([^\s]+)#' ); define( 'JETPACK_FACEBOOK_PHOTO_ALTERNATE_EMBED_REGEX', '#^https?://(www.)?facebook\.com/([^/]+)/photos/([^/]+)?#' ); define( 'JETPACK_FACEBOOK_VIDEO_EMBED_REGEX', '#^https?://(www.)?facebook\.com/(?:video.php|watch\/?)\?([^\s]+)#' ); define( 'JETPACK_FACEBOOK_VIDEO_ALTERNATE_EMBED_REGEX', '#^https?://(www.)?facebook\.com/([^/]+)/videos/([^/]+)?#' ); /* * Example URL: https://www.facebook.com/VenusWilliams/posts/10151647007373076 */ wp_embed_register_handler( 'facebook', JETPACK_FACEBOOK_EMBED_REGEX, 'jetpack_facebook_embed_handler' ); /* * Example URL: https://www.facebook.com/permalink.php?id=222622504529111&story_fbid=559431180743788 */ wp_embed_register_handler( 'facebook-alternate', JETPACK_FACEBOOK_ALTERNATE_EMBED_REGEX, 'jetpack_facebook_embed_handler' ); /* * Photos are handled on a different endpoint; e.g. https://www.facebook.com/photo.php?fbid=10151609960150073&set=a.398410140072.163165.106666030072&type=1 */ wp_embed_register_handler( 'facebook-photo', JETPACK_FACEBOOK_PHOTO_EMBED_REGEX, 'jetpack_facebook_embed_handler' ); /* * Photos (from pages for example) can be at */ wp_embed_register_handler( 'facebook-alternate-photo', JETPACK_FACEBOOK_PHOTO_ALTERNATE_EMBED_REGEX, 'jetpack_facebook_embed_handler' ); /* * Videos * * Formats: * https://www.facebook.com/video.php?v=2836814009877992 * https://www.facebook.com/watch/?v=2836814009877992 */ wp_embed_register_handler( 'facebook-video', JETPACK_FACEBOOK_VIDEO_EMBED_REGEX, 'jetpack_facebook_embed_handler' ); /* * Videos https://www.facebook.com/WhiteHouse/videos/10153398464269238/ */ wp_embed_register_handler( 'facebook-alternate-video', JETPACK_FACEBOOK_VIDEO_ALTERNATE_EMBED_REGEX, 'jetpack_facebook_embed_handler' ); /** * Callback to modify output of embedded Facebook posts. * * @param array $matches Regex partial matches against the URL passed. * @param array $attr Attributes received in embed response. * @param string $url Requested URL to be embedded. * @return string Facebook embed markup. */ function jetpack_facebook_embed_handler( $matches, $attr, $url ) { // This is a stop-gap solution until Facebook hopefully resolves this ticket // https://developers.facebook.com/community/threads/1675075423353415/?post_id=1675075426686748 $extra_styles = 'style="background-color: #fff; display: inline-block;"'; if ( str_contains( $url, 'video.php' ) || str_contains( $url, '/videos/' ) || str_contains( $url, '/watch' ) ) { $embed = sprintf( '<div class="fb-video" data-allowfullscreen="true" data-href="%1$s" %2$s></div>', esc_url( $url ), $extra_styles ); } else { $width = 552; // As of 01/2017, the default width of Facebook embeds when no width attribute provided. global $content_width; if ( is_numeric( $content_width ) && $content_width > 0 ) { $width = min( $width, $content_width ); } $embed = sprintf( '<div class="fb-post" data-href="%1$s" data-width="%2$s" %3$s></div>', esc_url( $url ), esc_attr( $width ), $extra_styles ); } // Skip rendering scripts in an AMP context. if ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() ) { return $embed; } // since Facebook is a faux embed, we need to load the JS SDK in the wpview embed iframe. if ( defined( 'DOING_AJAX' ) && DOING_AJAX // No need to check for a nonce here, that's already handled by Core further up. && ! empty( $_POST['action'] ) // phpcs:ignore WordPress.Security.NonceVerification.Missing && 'parse-embed' === $_POST['action'] // phpcs:ignore WordPress.Security.NonceVerification.Missing ) { ob_start(); wp_scripts()->do_items( array( 'jetpack-facebook-embed' ) ); $scripts = ob_get_clean(); return $embed . $scripts; } else { wp_enqueue_script( 'jetpack-facebook-embed' ); return $embed; } } /** * Shortcode handler. * * @param array $atts Shortcode attributes. */ function jetpack_facebook_shortcode_handler( $atts ) { global $wp_embed; if ( empty( $atts['url'] ) ) { return; } if ( ! preg_match( JETPACK_FACEBOOK_EMBED_REGEX, $atts['url'] ) && ! preg_match( JETPACK_FACEBOOK_PHOTO_EMBED_REGEX, $atts['url'] ) && ! preg_match( JETPACK_FACEBOOK_VIDEO_EMBED_REGEX, $atts['url'] ) && ! preg_match( JETPACK_FACEBOOK_VIDEO_ALTERNATE_EMBED_REGEX, $atts['url'] ) ) { return; } return $wp_embed->shortcode( $atts, $atts['url'] ); } add_shortcode( 'facebook', 'jetpack_facebook_shortcode_handler' ); /** * Embed Reversal for Facebook * * Hooked to pre_kses, converts an embed code from www.facebook.com to an oEmbeddable URL. * * @param string $content Post content. * * @return string The filtered or the original content. **/ function jetpack_facebook_embed_reversal( $content ) { if ( ! is_string( $content ) || false === stripos( $content, 'https://www.facebook.com/plugins/post.php' ) ) { return $content; } /* * Sample embed code: * <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> */ $regexes = array(); $regexes[] = '#<iframe[^>]+?src="((?:https?:)?//(?:www\.)?facebook\.com/plugins/post\.php\?[^"]+)"[^>]*?>\s*?</iframe>#i'; $regexes[] = '#<iframe[^&]+?src="((?:https?:)?//(?:www\.)?facebook\.com/plugins/post\.php\?[^"]+)"[^&]*?>\s*?</iframe>#i'; foreach ( $regexes as $regex ) { if ( ! preg_match_all( $regex, $content, $matches, PREG_SET_ORDER ) ) { continue; } foreach ( $matches as $match ) { if ( ! preg_match( '#(https?:)?//(?:www\.)?facebook\.com/plugins/post.php([^/]*)#i', $match[1], $url_matches ) ) { continue; } $src_url = $url_matches[0]; $parsed_url = wp_parse_url( $src_url ); if ( empty( $parsed_url['query'] ) ) { continue; } $query_args = array(); wp_parse_str( $parsed_url['query'], $query_args ); if ( empty( $query_args['href'] ) ) { continue; } // Since we support Facebook via oEmbed, we simply leave a link on a line by itself. $replace_regex = sprintf( '#\s*%s\s*#', preg_quote( $match[0], '#' ) ); $url = esc_url( $query_args['href'] ); $content = preg_replace( $replace_regex, sprintf( "\n\n%s\n\n", $url ), $content ); /** This action is documented in modules/shortcodes/youtube.php */ do_action( 'jetpack_embed_to_shortcode', 'facebook', $url ); } } return $content; } /** * Embed reversal: Convert an embed code from Facebook.com to an oEmbeddable URL. */ if ( jetpack_shortcodes_should_hook_pre_kses() ) { add_filter( 'pre_kses', 'jetpack_facebook_embed_reversal' ); }