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Editing: class.jetpack-twitter-cards.php
<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName /** * Jetpack Twitter Card handling. * * @package automattic/jetpack */ /** * 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 { /** * Adds Twitter Card tags. * * @param array $og_tags Existing OG tags. * * @return array OG tags inclusive of Twitter Card output. */ public static function twitter_cards_tags( $og_tags ) { global $post; $post_id = ( $post instanceof WP_Post ) ? $post->ID : null; /** * 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' ) && ! empty( $post_id ) ) { $post_image = Jetpack_PostImages::get_image( $post_id, array( 'width' => 144, 'height' => 144, ) ); if ( ! empty( $post_image ) && is_array( $post_image ) ) { // 4096 is the maximum size for an image per https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/summary . if ( isset( $post_image['src_width'], $post_image['src_height'] ) && (int) $post_image['src_width'] <= 4096 && (int) $post_image['src_height'] <= 4096 ) { // 300x157 is the minimum size for a summary_large_image per https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/summary-card-with-large-image . if ( (int) $post_image['src_width'] >= 300 && (int) $post_image['src_height'] >= 157 ) { $card_type = 'summary_large_image'; $og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 640, $post_image['src'] ) ); } else { $og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 144, $post_image['src'] ) ); } // Add the alt tag if we have one. if ( ! empty( $post_image['alt_text'] ) ) { // Shorten it if it is too long. if ( strlen( $post_image['alt_text'] ) > $alt_length ) { $og_tags['twitter:image:alt'] = esc_attr( mb_substr( $post_image['alt_text'], 0, $alt_length ) . '…' ); } else { $og_tags['twitter:image:alt'] = esc_attr( $post_image['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' ) && ! empty( $post_id ) ) { $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; } /** * Sanitize the Twitter user by normalizing the @. * * @param string $str Twitter user value. * * @return string Twitter user value. */ public static function sanitize_twitter_user( $str ) { return '@' . preg_replace( '/^@/', '', $str ); } /** * Determines if a site tag is one of the default WP.com/Jetpack ones. * * @param string $site_tag Site tag. * * @return bool True if the default site tag is being used. */ public static function is_default_site_tag( $site_tag ) { return in_array( $site_tag, array( '@wordpressdotcom', '@jetpack', 'wordpressdotcom', 'jetpack' ), true ); } /** * Give priority to the creator tag if using the default site tag. * * @param string $site_tag Site tag. * @param array $og_tags OG tags. * * @return string Site tag. */ public 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; } /** * Define the Twitter Card type based on image count. * * @param array $og_tags Existing OG tags. * @param array $extract Result of the Image Extractor class. * * @return array */ public 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 ); } /** * Updates the Twitter Card output. * * @param string $og_tag A single OG tag. * * @return string Result of the OG tag. */ public static function twitter_cards_output( $og_tag ) { return ( false !== strpos( $og_tag, 'twitter:' ) ) ? preg_replace( '/property="([^"]+)"/', 'name="\1"', $og_tag ) : $og_tag; } /** * Adds settings section and field. */ public 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', ) ); } /** * Add global sharing options. */ public static function sharing_global_options() { do_settings_fields( 'sharing', 'jetpack-twitter-cards-settings' ); } /** * Get the Twitter Via tag. * * @return string Twitter via tag. */ public 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 ) ) { /** This action is documented in modules/sharedaddy/sharing-sources.php */ return apply_filters( 'jetpack_sharing_twitter_via', '', null ); } return $site_tag; } /** * Output the settings field. */ public 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 } /** * Validate the settings submission. */ public 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( wp_strip_all_tags( $_POST['jetpack-twitter-cards-site-tag'] ), '@' ) ) ); } } /** * Initiates the class. */ public 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();
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