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