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<?php |
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/** |
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* Open Graph Tags |
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* |
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* Add Open Graph tags so that Facebook (and any other service that supports them) |
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* can crawl the site better and we provide a better sharing experience. |
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* |
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* @link http://ogp.me/ |
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* @link http://developers.facebook.com/docs/opengraph/ |
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*/ |
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add_action( 'wp_head', 'jetpack_og_tags' ); |
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|
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function jetpack_og_tags() { |
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if ( false === apply_filters( 'jetpack_enable_opengraph', true ) ) { |
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_deprecated_function( 'jetpack_enable_opengraph', '2.0.3', 'jetpack_enable_open_graph' ); |
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return; |
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} |
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|
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// Disable the widont filter on WP.com to avoid stray  s |
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$disable_widont = remove_filter( 'the_title', 'widont' ); |
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|
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$og_output = "\n<!-- Jetpack Open Graph Tags -->\n"; |
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$tags = array(); |
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|
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$image_width = absint( apply_filters( 'jetpack_open_graph_image_width', 200 ) ); |
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$image_height = absint( apply_filters( 'jetpack_open_graph_image_height', 200 ) ); |
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$description_length = 197; |
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|
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if ( is_home() || is_front_page() ) { |
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$site_type = get_option( 'open_graph_protocol_site_type' ); |
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$tags['og:type'] = ! empty( $site_type ) ? $site_type : 'blog'; |
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$tags['og:title'] = get_bloginfo( 'name' ); |
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$tags['og:description'] = get_bloginfo( 'description' ); |
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|
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$front_page_id = get_option( 'page_for_posts' ); |
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if ( $front_page_id && is_home() ) |
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$tags['og:url'] = get_permalink( $front_page_id ); |
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else |
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$tags['og:url'] = home_url( '/' ); |
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|
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// Associate a blog's root path with one or more Facebook accounts |
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$facebook_admins = get_option( 'facebook_admins' ); |
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if ( ! empty( $facebook_admins ) ) |
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$tags['fb:admins'] = $facebook_admins; |
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|
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} else if ( is_author() ) { |
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$tags['og:type'] = 'profile'; |
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|
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$author = get_queried_object(); |
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|
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$tags['og:title'] = $author->display_name; |
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$tags['og:url'] = get_author_posts_url( $author->ID ); |
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$tags['og:description'] = $author->description; |
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$tags['profile:first_name'] = get_the_author_meta( 'first_name', $author->ID ); |
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$tags['profile:last_name'] = get_the_author_meta( 'last_name', $author->ID ); |
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|
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} else if ( is_singular() ) { |
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global $post; |
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$data = $post; // so that we don't accidentally explode the global |
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|
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$tags['og:type'] = 'article'; |
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$tags['og:title'] = empty( $data->post_title ) ? ' ' : wp_kses( $data->post_title, array() ) ; |
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$tags['og:url'] = get_permalink( $data->ID ); |
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if ( !post_password_required() ) |
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$tags['og:description'] = ! empty( $data->post_excerpt ) ? strip_shortcodes( wp_kses( $data->post_excerpt, array() ) ) : wp_trim_words( strip_shortcodes( wp_kses( $data->post_content, array() ) ) ); |
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$tags['og:description'] = empty( $tags['og:description'] ) ? ' ' : $tags['og:description']; |
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} |
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|
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// Re-enable widont if we had disabled it |
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if ( $disable_widont ) |
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add_filter( 'the_title', 'widont' ); |
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|
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if ( empty( $tags ) ) |
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return; |
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|
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$tags['og:site_name'] = get_bloginfo( 'name' ); |
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$tags['og:image'] = jetpack_og_get_image( $image_width, $image_height ); |
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|
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// Facebook whines if you give it an empty title |
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if ( empty( $tags['og:title'] ) ) |
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$tags['og:title'] = __( '(no title)', 'jetpack' ); |
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|
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// Shorten the description if it's too long |
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$tags['og:description'] = strlen( $tags['og:description'] ) > $description_length ? mb_substr( $tags['og:description'], 0, $description_length ) . '...' : $tags['og:description']; |
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|
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// Add any additional tags here, or modify what we've come up with |
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$tags = apply_filters( 'jetpack_open_graph_tags', $tags, compact( 'image_width', 'image_height' ) ); |
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|
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foreach ( (array) $tags as $tag_property => $tag_content ) { |
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// to accomodate multiple images |
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$tag_content = (array) $tag_content; |
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$tag_content = array_unique( $tag_content ); |
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|
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foreach ( $tag_content as $tag_content_single ) { |
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if ( empty( $tag_content_single ) ) |
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continue; // Don't ever output empty tags |
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$og_tag = sprintf( '<meta property="%s" content="%s" />', esc_attr( $tag_property ), esc_attr( $tag_content_single ) ); |
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$og_output .= apply_filters( 'jetpack_open_graph_output', $og_tag ); |
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$og_output .= "\n"; |
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} |
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} |
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|
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echo $og_output; |
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} |
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|
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function jetpack_og_get_image( $width = 200, $height = 200, $max_images = 4 ) { // Facebook requires thumbnails to be a minimum of 200x200 |
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$image = ''; |
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|
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if ( is_singular() && !is_home() && !is_front_page() ) { |
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global $post; |
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$image = ''; |
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|
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// Attempt to find something good for this post using our generalized PostImages code |
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if ( class_exists( 'Jetpack_PostImages' ) ) { |
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$post_images = Jetpack_PostImages::get_images( $post->ID, array( 'width' => $width, 'height' => $height ) ); |
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if ( $post_images && !is_wp_error( $post_images ) ) { |
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$image = array(); |
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foreach ( (array) $post_images as $post_image ) { |
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$image[] = $post_image['src']; |
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} |
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} |
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} |
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} else if ( is_author() ) { |
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$author = get_queried_object(); |
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if ( function_exists( 'get_avatar_url' ) ) { |
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$avatar = get_avatar_url( $author->user_email, $width ); |
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|
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if ( ! empty( $avatar ) ) { |
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if ( is_array( $avatar ) ) |
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$image = $avatar[0]; |
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else |
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$image = $avatar; |
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} |
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} |
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else { |
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$has_filter = has_filter( 'pre_option_show_avatars', '__return_true' ); |
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if ( !$has_filter ) { |
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add_filter( 'pre_option_show_avatars', '__return_true' ); |
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} |
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$avatar = get_avatar( $author->user_email, $width ); |
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if ( !$has_filter ) { |
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remove_filter( 'pre_option_show_avatars', '__return_true' ); |
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} |
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|
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if ( !empty( $avatar ) && !is_wp_error( $avatar ) ) { |
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if ( preg_match( '/src=["\']([^"\']+)["\']/', $avatar, $matches ) ); |
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$image = wp_specialchars_decode( $matches[1], ENT_QUOTES ); |
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} |
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} |
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} |
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|
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// Fallback to Blavatar if available |
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if ( function_exists( 'blavatar_domain' ) ) { |
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$blavatar_domain = blavatar_domain( site_url() ); |
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if ( empty( $image ) && blavatar_exists( $blavatar_domain ) ) |
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$image = blavatar_url( $blavatar_domain, 'img', $width ); |
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} |
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|
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return $image; |
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} |
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