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<?php
/* Twitter Cards
*
* Hooks onto the Open Graph protocol and extends it by adding only the tags
* we need for twitter cards.
*
* @see /wp-content/blog-plugins/open-graph.php
* @see https://dev.twitter.com/cards/overview
*/
class Jetpack_Twitter_Cards {
static function twitter_cards_tags( $og_tags ) {
global $post;
/**
* Maximum alt text length.
*
* @see https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/summary-card-with-large-image.html
*/
$alt_length = 420;
if ( post_password_required() ) {
return $og_tags;
}
/** This action is documented in class.jetpack.php */
if ( apply_filters( 'jetpack_disable_twitter_cards', false ) ) {
return $og_tags;
}
/*
* These tags apply to any page (home, archives, etc)
*/
// If we have information on the author/creator, then include that as well
if ( ! empty( $post ) && ! empty( $post->post_author ) ) {
/** This action is documented in modules/sharedaddy/sharing-sources.php */
$handle = apply_filters( 'jetpack_sharing_twitter_via', '', $post->ID );
if ( ! empty( $handle ) && ! self::is_default_site_tag( $handle ) ) {
$og_tags['twitter:creator'] = self::sanitize_twitter_user( $handle );
}
}
$site_tag = self::site_tag();
/** This action is documented in modules/sharedaddy/sharing-sources.php */
$site_tag = apply_filters( 'jetpack_sharing_twitter_via', $site_tag, ( is_singular() ? $post->ID : null ) );
/** This action is documented in modules/sharedaddy/sharing-sources.php */
$site_tag = apply_filters( 'jetpack_twitter_cards_site_tag', $site_tag, $og_tags );
if ( ! empty( $site_tag ) ) {
$og_tags['twitter:site'] = self::sanitize_twitter_user( $site_tag );
}
if ( ! is_singular() || ! empty( $og_tags['twitter:card'] ) ) {
/**
* Filter the default Twitter card image, used when no image can be found in a post.
*
* @module sharedaddy, publicize
*
* @since 5.9.0
*
* @param string $str Default image URL.
*/
$image = apply_filters( 'jetpack_twitter_cards_image_default', '' );
if ( ! empty( $image ) ) {
$og_tags['twitter:image'] = $image;
}
return $og_tags;
}
$the_title = get_the_title();
if ( ! $the_title ) {
$the_title = get_bloginfo( 'name' );
}
$og_tags['twitter:text:title'] = $the_title;
/*
* The following tags only apply to single pages.
*/
$card_type = 'summary';
// Try to give priority to featured images
if ( class_exists('Jetpack_PostImages') ) {
$featured = Jetpack_PostImages::from_thumbnail( $post->ID, 240, 240 );
if ( !empty( $featured ) && count( $featured ) > 0 ) {
if ( (int) $featured[0]['src_width'] >= 280 && (int) $featured[0]['src_height'] >= 150 ) {
$card_type = 'summary_large_image';
$og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 640, $featured[0]['src'] ) );
} else {
$og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 240, $featured[0]['src'] ) );
}
// Add the alt tag if we have one.
if ( ! empty( $featured[0]['alt_text'] ) ) {
// Shorten it if it is too long.
if ( strlen( $featured[0]['alt_text'] ) > $alt_length ) {
$og_tags['twitter:image:alt'] = esc_attr( mb_substr( $featured[0]['alt_text'], 0, $alt_length ) . '…' );
} else {
$og_tags['twitter:image:alt'] = esc_attr( $featured[0]['alt_text'] );
}
}
}
}
// Only proceed with media analysis if a featured image has not superseded it already.
if ( empty( $og_tags['twitter:image'] ) && empty( $og_tags['twitter:image:src'] ) ) {
if ( ! class_exists( 'Jetpack_Media_Summary' ) && defined('IS_WPCOM') && IS_WPCOM ) {
include( WP_CONTENT_DIR . '/lib/class.wpcom-media-summary.php' );
}
if ( ! class_exists( 'Jetpack_Media_Summary' ) ) {
jetpack_require_lib( 'class.media-summary' );
}
// Test again, class should already be auto-loaded in Jetpack.
// If not, skip extra media analysis and stick with a summary card
if ( class_exists( 'Jetpack_Media_Summary' ) ) {
$extract = Jetpack_Media_Summary::get( $post->ID );
if ( 'gallery' == $extract['type'] ) {
list( $og_tags, $card_type ) = self::twitter_cards_define_type_based_on_image_count( $og_tags, $extract );
} elseif ( 'video' == $extract['type'] ) {
// Leave as summary, but with large pict of poster frame (we know those comply to Twitter's size requirements)
$card_type = 'summary_large_image';
$og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 640, $extract['image'] ) );
} else {
list( $og_tags, $card_type ) = self::twitter_cards_define_type_based_on_image_count( $og_tags, $extract );
}
}
}
$og_tags['twitter:card'] = $card_type;
// Make sure we have a description for Twitter, their validator isn't happy without some content (single space not valid).
if ( ! isset( $og_tags['og:description'] ) || '' == trim( $og_tags['og:description'] ) || __('Visit the post for more.', 'jetpack') == $og_tags['og:description'] ) { // empty( trim( $og_tags['og:description'] ) ) isn't valid php
$has_creator = ( ! empty($og_tags['twitter:creator']) && '@wordpressdotcom' != $og_tags['twitter:creator'] ) ? true : false;
if ( ! empty( $extract ) && 'video' == $extract['type'] ) { // use $extract['type'] since $card_type is 'summary' for video posts
/* translators: %s is the post author */
$og_tags['twitter:description'] = ( $has_creator ) ? sprintf( __( 'Video post by %s.', 'jetpack' ), $og_tags['twitter:creator'] ) : __( 'Video post.', 'jetpack' );
} else {
/* translators: %s is the post author */
$og_tags['twitter:description'] = ( $has_creator ) ? sprintf( __( 'Post by %s.', 'jetpack' ), $og_tags['twitter:creator'] ) : __( 'Visit the post for more.', 'jetpack');
}
}
if ( empty( $og_tags['twitter:image'] ) && empty( $og_tags['twitter:image:src'] ) ) {
/** This action is documented in class.jetpack-twitter-cards.php */
$image = apply_filters( 'jetpack_twitter_cards_image_default', '' );
if ( ! empty( $image ) ) {
$og_tags['twitter:image'] = $image;
}
}
return $og_tags;
}
static function sanitize_twitter_user( $str ) {
return '@' . preg_replace( '/^@/', '', $str );
}
static function is_default_site_tag( $site_tag ) {
return in_array( $site_tag, array( '@wordpressdotcom', '@jetpack', 'wordpressdotcom', 'jetpack' ) );
}
static function prioritize_creator_over_default_site( $site_tag, $og_tags = array() ) {
if ( ! empty( $og_tags['twitter:creator'] ) && self::is_default_site_tag( $site_tag ) ) {
return $og_tags['twitter:creator'];
}
return $site_tag;
}
static function twitter_cards_define_type_based_on_image_count( $og_tags, $extract ) {
$card_type = 'summary';
$img_count = $extract['count']['image'];
if ( empty( $img_count ) ) {
// No images, use Blavatar as a thumbnail for the summary type.
if ( function_exists('blavatar_domain') ) {
$blavatar_domain = blavatar_domain( site_url() );
if ( blavatar_exists( $blavatar_domain ) ) {
$og_tags['twitter:image'] = blavatar_url( $blavatar_domain, 'img', 240 );
}
}
// Second fall back, Site Logo
if ( empty( $og_tags['twitter:image'] ) && ( function_exists( 'jetpack_has_site_logo' ) && jetpack_has_site_logo() ) ) {
$og_tags['twitter:image'] = jetpack_get_site_logo( 'url' );
}
// Third fall back, Site Icon
if ( empty( $og_tags['twitter:image'] ) && has_site_icon() ) {
$og_tags['twitter:image'] = get_site_icon_url( '240' );
}
// Not falling back on Gravatar, because there's no way to know if we end up with an auto-generated one.
} elseif ( $img_count && ( 'image' == $extract['type'] || 'gallery' == $extract['type'] ) ) {
// Test for $extract['type'] to limit to image and gallery, so we don't send a potential fallback image like a Gravatar as a photo post.
$card_type = 'summary_large_image';
$og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 1400, ( empty( $extract['images'] ) ) ? $extract['image'] : $extract['images'][0]['url'] ) );
}
return array( $og_tags, $card_type );
}
static function twitter_cards_output( $og_tag ) {
return ( false !== strpos( $og_tag, 'twitter:' ) ) ? preg_replace( '/property="([^"]+)"/', 'name="\1"', $og_tag ) : $og_tag;
}
static function settings_init() {
add_settings_section( 'jetpack-twitter-cards-settings', 'Twitter Cards', '__return_false', 'sharing' );
add_settings_field(
'jetpack-twitter-cards-site-tag',
__( 'Twitter Site Tag', 'jetpack' ),
array( __CLASS__, 'settings_field' ),
'sharing',
'jetpack-twitter-cards-settings',
array(
'label_for' => 'jetpack-twitter-cards-site-tag',
)
);
}
static function sharing_global_options() {
do_settings_fields( 'sharing', 'jetpack-twitter-cards-settings' );
}
static function site_tag() {
$site_tag = ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ?
trim( get_option( 'twitter_via' ) ) :
Jetpack_Options::get_option_and_ensure_autoload( 'jetpack-twitter-cards-site-tag', '' );
if ( empty( $site_tag ) ) {
if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
return 'wordpressdotcom';
} else {
return;
}
}
return $site_tag;
}
static function settings_field() {
wp_nonce_field( 'jetpack-twitter-cards-settings', 'jetpack_twitter_cards_nonce', false );
?>
<input type="text" id="jetpack-twitter-cards-site-tag" class="regular-text" name="jetpack-twitter-cards-site-tag" value="<?php echo esc_attr( get_option( 'jetpack-twitter-cards-site-tag' ) ); ?>" />
<p class="description" style="width: auto;"><?php esc_html_e( 'The Twitter username of the owner of this site\'s domain.', 'jetpack' ); ?></p>
<?php
}
static function settings_validate() {
if ( wp_verify_nonce( $_POST['jetpack_twitter_cards_nonce'], 'jetpack-twitter-cards-settings' ) ) {
update_option( 'jetpack-twitter-cards-site-tag', trim( ltrim( strip_tags( $_POST['jetpack-twitter-cards-site-tag'] ), '@' ) ) );
}
}
static function init() {
add_filter( 'jetpack_open_graph_tags', array( __CLASS__, 'twitter_cards_tags' ) );
add_filter( 'jetpack_open_graph_output', array( __CLASS__, 'twitter_cards_output' ) );
add_filter( 'jetpack_twitter_cards_site_tag', array( __CLASS__, 'site_tag' ), -99 );
add_filter( 'jetpack_twitter_cards_site_tag', array( __CLASS__, 'prioritize_creator_over_default_site' ), 99, 2 );
add_action( 'admin_init', array( __CLASS__, 'settings_init' ) );
add_action( 'sharing_global_options', array( __CLASS__, 'sharing_global_options' ) );
add_action( 'sharing_admin_update', array( __CLASS__, 'settings_validate' ) );
}
}
Jetpack_Twitter_Cards::init();