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<?php
/**
* Facebook embeds
*
* @package automattic/jetpack
*/
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.
*/
add_filter( 'pre_kses', 'jetpack_facebook_embed_reversal' );