Archived
234 lines
8.4 KiB
PHP
234 lines
8.4 KiB
PHP
<?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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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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// Disable the widont filter on WP.com to avoid stray  s
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$disable_widont = remove_filter( 'the_title', 'widont' );
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$og_output = "\n<!-- Jetpack Open Graph Tags -->\n";
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$tags = array();
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$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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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 ) ? $site_type : 'website';
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$tags['og:title'] = get_bloginfo( 'name' );
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$tags['og:description'] = get_bloginfo( 'description' );
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$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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// 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'] = $facebook_admins;
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} else if ( is_author() ) {
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$tags['og:type'] = 'profile';
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$author = get_queried_object();
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$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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} else if ( is_singular() ) {
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global $post;
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$data = $post; // so that we don't accidentally explode the global
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$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 ) ? preg_replace( '@https?://[\S]+@', '', strip_shortcodes( wp_kses( $data->post_excerpt, array() ) ) ): wp_trim_words( preg_replace( '@https?://[\S]+@', '', strip_shortcodes( wp_kses( $data->post_content, array() ) ) ) );
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$tags['og:description'] = empty( $tags['og:description'] ) ? ' ' : $tags['og:description'];
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$tags['article:published_time'] = date( 'c', strtotime( $data->post_date_gmt ) );
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$tags['article:modified_time'] = date( 'c', strtotime( $data->post_modified_gmt ) );
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if ( post_type_supports( get_post_type( $data ), 'author' ) && isset( $data->post_author ) )
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$tags['article:author'] = get_author_posts_url( $data->post_author );
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}
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// Allow plugins to inject additional template-specific open graph tags
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$tags = apply_filters( 'jetpack_open_graph_base_tags', $tags, compact( 'image_width', 'image_height' ) );
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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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if ( empty( $tags ) && apply_filters( 'jetpack_open_graph_return_if_empty', true ) )
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return;
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$tags['og:site_name'] = get_bloginfo( 'name' );
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if ( !post_password_required() )
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$tags['og:image'] = jetpack_og_get_image( $image_width, $image_height );
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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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// Shorten the description if it's too long
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if ( isset( $tags['og:description'] ) ) {
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$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', $tags, compact( 'image_width', 'image_height' ) );
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// secure_urls need to go right after each og:image to work properly so we will abstract them here
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$secure = $tags['og:image:secure_url'] = ( empty( $tags['og:image:secure_url'] ) ) ? '' : $tags['og:image:secure_url'];
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unset( $tags['og:image:secure_url'] );
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$secure_image_num = 0;
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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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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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if ( 'og:image' == $tag_property ) {
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if ( is_array( $secure ) && !empty( $secure[$secure_image_num] ) ) {
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$og_tag = sprintf( '<meta property="og:image:secure_url" content="%s" />', esc_url( $secure[ $secure_image_num ] ) );
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$og_output .= apply_filters( 'jetpack_open_graph_output', $og_tag );
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$og_output .= "\n";
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} else if ( !is_array( $secure ) && !empty( $secure ) ) {
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$og_tag = sprintf( '<meta property="og:image:secure_url" content="%s" />', esc_url( $secure ) );
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$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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$secure_image_num++;
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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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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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if ( is_singular() && !is_home() && !is_front_page() ) {
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global $post;
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$image = '';
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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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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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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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if ( empty( $image ) )
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$image = array();
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else if ( !is_array( $image ) )
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$image = array( $image );
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// First fall back, blavatar
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if ( empty( $image ) && function_exists( 'blavatar_domain' ) ) {
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$blavatar_domain = blavatar_domain( site_url() );
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if ( blavatar_exists( $blavatar_domain ) )
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$image[] = blavatar_url( $blavatar_domain, 'img', $width );
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}
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// Second fall back, blank image
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if ( empty( $image ) ) {
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$image[] = "http://wordpress.com/i/blank.jpg";
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}
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return $image;
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}
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/**
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* @param $email
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* @param $width
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* @return array|bool|mixed|string
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*/
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function jetpack_og_get_image_gravatar( $email, $width ) {
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$image = '';
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if ( function_exists( 'get_avatar_url' ) ) {
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$avatar = get_avatar_url($email, $width);
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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 = $avatar;
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}
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} else {
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$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( $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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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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return $image;
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}
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