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<?php
/**
* Facebook embeds
*
* @package 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 array $url Requested URL to be embedded.
*/
function jetpack_facebook_embed_handler( $matches, $attr, $url ) {
if (
false !== strpos( $url, 'video.php' )
|| false !== strpos( $url, '/videos/' )
|| false !== strpos( $url, '/watch' )
) {
$embed = sprintf( '<div class="fb-video" data-allowfullscreen="true" data-href="%s"></div>', esc_url( $url ) );
} else {
$width = 552; // As of 01/2017, the default width of Facebook embeds when no width attribute provided.
global $content_width;
if ( isset( $content_width ) ) {
$width = min( $width, $content_width );
}
$embed = sprintf( '<fb:post href="%s" data-width="%s"></fb:post>', esc_url( $url ), esc_attr( $width ) );
}
// 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' );
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