functions.opengraph.php
| 1 | <?php |
| 2 | /** |
| 3 | * Open Graph Tags |
| 4 | * |
| 5 | * Add Open Graph tags so that Facebook (and any other service that supports them) |
| 6 | * can crawl the site better and we provide a better sharing experience. |
| 7 | * |
| 8 | * @link http://ogp.me/ |
| 9 | * @link http://developers.facebook.com/docs/opengraph/ |
| 10 | */ |
| 11 | add_action( 'wp_head', 'jetpack_og_tags' ); |
| 12 | |
| 13 | function jetpack_og_tags() { |
| 14 | if ( false === apply_filters( 'jetpack_enable_opengraph', true ) ) { |
| 15 | _deprecated_function( 'jetpack_enable_opengraph', '2.0.3', 'jetpack_enable_open_graph' ); |
| 16 | return; |
| 17 | } |
| 18 | |
| 19 | // Disable the widont filter on WP.com to avoid stray  s |
| 20 | $disable_widont = remove_filter( 'the_title', 'widont' ); |
| 21 | |
| 22 | $og_output = "\n<!-- Jetpack Open Graph Tags -->\n"; |
| 23 | $tags = array(); |
| 24 | |
| 25 | $image_width = absint( apply_filters( 'jetpack_open_graph_image_width', 200 ) ); |
| 26 | $image_height = absint( apply_filters( 'jetpack_open_graph_image_height', 200 ) ); |
| 27 | $description_length = 197; |
| 28 | |
| 29 | if ( is_home() || is_front_page() ) { |
| 30 | $site_type = get_option( 'open_graph_protocol_site_type' ); |
| 31 | $tags['og:type'] = ! empty( $site_type ) ? $site_type : 'blog'; |
| 32 | $tags['og:title'] = get_bloginfo( 'name' ); |
| 33 | $tags['og:description'] = get_bloginfo( 'description' ); |
| 34 | |
| 35 | $front_page_id = get_option( 'page_for_posts' ); |
| 36 | if ( $front_page_id && is_home() ) |
| 37 | $tags['og:url'] = get_permalink( $front_page_id ); |
| 38 | else |
| 39 | $tags['og:url'] = home_url( '/' ); |
| 40 | |
| 41 | // Associate a blog's root path with one or more Facebook accounts |
| 42 | $facebook_admins = get_option( 'facebook_admins' ); |
| 43 | if ( ! empty( $facebook_admins ) ) |
| 44 | $tags['fb:admins'] = $facebook_admins; |
| 45 | |
| 46 | } else if ( is_author() ) { |
| 47 | $tags['og:type'] = 'profile'; |
| 48 | |
| 49 | $author = get_queried_object(); |
| 50 | |
| 51 | $tags['og:title'] = $author->display_name; |
| 52 | $tags['og:url'] = get_author_posts_url( $author->ID ); |
| 53 | $tags['og:description'] = $author->description; |
| 54 | $tags['profile:first_name'] = get_the_author_meta( 'first_name', $author->ID ); |
| 55 | $tags['profile:last_name'] = get_the_author_meta( 'last_name', $author->ID ); |
| 56 | |
| 57 | } else if ( is_singular() ) { |
| 58 | global $post; |
| 59 | $data = $post; // so that we don't accidentally explode the global |
| 60 | |
| 61 | $tags['og:type'] = 'article'; |
| 62 | $tags['og:title'] = empty( $data->post_title ) ? ' ' : wp_kses( $data->post_title, array() ) ; |
| 63 | $tags['og:url'] = get_permalink( $data->ID ); |
| 64 | if ( !post_password_required() ) |
| 65 | $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() ) ) ) ); |
| 66 | $tags['og:description'] = empty( $tags['og:description'] ) ? ' ' : $tags['og:description']; |
| 67 | } |
| 68 | |
| 69 | // Re-enable widont if we had disabled it |
| 70 | if ( $disable_widont ) |
| 71 | add_filter( 'the_title', 'widont' ); |
| 72 | |
| 73 | if ( empty( $tags ) ) |
| 74 | return; |
| 75 | |
| 76 | $tags['og:site_name'] = get_bloginfo( 'name' ); |
| 77 | $tags['og:image'] = jetpack_og_get_image( $image_width, $image_height ); |
| 78 | |
| 79 | // Facebook whines if you give it an empty title |
| 80 | if ( empty( $tags['og:title'] ) ) |
| 81 | $tags['og:title'] = __( '(no title)', 'jetpack' ); |
| 82 | |
| 83 | // Shorten the description if it's too long |
| 84 | $tags['og:description'] = strlen( $tags['og:description'] ) > $description_length ? mb_substr( $tags['og:description'], 0, $description_length ) . '...' : $tags['og:description']; |
| 85 | |
| 86 | // Add any additional tags here, or modify what we've come up with |
| 87 | $tags = apply_filters( 'jetpack_open_graph_tags', $tags, compact( 'image_width', 'image_height' ) ); |
| 88 | |
| 89 | // secure_urls need to go right after each og:image to work properly so we will abstract them here |
| 90 | $secure = $tags['og:image:secure_url'] = ( empty( $tags['og:image:secure_url'] ) ) ? '' : $tags['og:image:secure_url']; |
| 91 | unset( $tags['og:image:secure_url'] ); |
| 92 | $secure_image_num = 0; |
| 93 | |
| 94 | foreach ( (array) $tags as $tag_property => $tag_content ) { |
| 95 | // to accomodate multiple images |
| 96 | $tag_content = (array) $tag_content; |
| 97 | $tag_content = array_unique( $tag_content ); |
| 98 | |
| 99 | foreach ( $tag_content as $tag_content_single ) { |
| 100 | if ( empty( $tag_content_single ) ) |
| 101 | continue; // Don't ever output empty tags |
| 102 | $og_tag = sprintf( '<meta property="%s" content="%s" />', esc_attr( $tag_property ), esc_attr( $tag_content_single ) ); |
| 103 | $og_output .= apply_filters( 'jetpack_open_graph_output', $og_tag ); |
| 104 | $og_output .= "\n"; |
| 105 | |
| 106 | if ( 'og:image' == $tag_property ) { |
| 107 | if ( is_array( $secure ) && !empty( $secure[$secure_image_num] ) ) { |
| 108 | $og_tag = sprintf( '<meta property="og:image:secure_url" content="%s" />', esc_url( $secure[ $secure_image_num ] ) ); |
| 109 | $og_output .= apply_filters( 'jetpack_open_graph_output', $og_tag ); |
| 110 | $og_output .= "\n"; |
| 111 | } else if ( !is_array( $secure ) && !empty( $secure ) ) { |
| 112 | $og_tag = sprintf( '<meta property="og:image:secure_url" content="%s" />', esc_url( $secure ) ); |
| 113 | $og_output .= apply_filters( 'jetpack_open_graph_output', $og_tag ); |
| 114 | $og_output .= "\n"; |
| 115 | } |
| 116 | $secure_image_num++; |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | echo $og_output; |
| 122 | } |
| 123 | |
| 124 | function jetpack_og_get_image( $width = 200, $height = 200, $max_images = 4 ) { // Facebook requires thumbnails to be a minimum of 200x200 |
| 125 | $image = ''; |
| 126 | |
| 127 | if ( is_singular() && !is_home() && !is_front_page() ) { |
| 128 | global $post; |
| 129 | $image = ''; |
| 130 | |
| 131 | // Attempt to find something good for this post using our generalized PostImages code |
| 132 | if ( class_exists( 'Jetpack_PostImages' ) ) { |
| 133 | $post_images = Jetpack_PostImages::get_images( $post->ID, array( 'width' => $width, 'height' => $height ) ); |
| 134 | if ( $post_images && !is_wp_error( $post_images ) ) { |
| 135 | $image = array(); |
| 136 | foreach ( (array) $post_images as $post_image ) { |
| 137 | $image[] = $post_image['src']; |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | } else if ( is_author() ) { |
| 142 | $author = get_queried_object(); |
| 143 | if ( function_exists( 'get_avatar_url' ) ) { |
| 144 | $avatar = get_avatar_url( $author->user_email, $width ); |
| 145 | |
| 146 | if ( ! empty( $avatar ) ) { |
| 147 | if ( is_array( $avatar ) ) |
| 148 | $image = $avatar[0]; |
| 149 | else |
| 150 | $image = $avatar; |
| 151 | } |
| 152 | } |
| 153 | else { |
| 154 | $has_filter = has_filter( 'pre_option_show_avatars', '__return_true' ); |
| 155 | if ( !$has_filter ) { |
| 156 | add_filter( 'pre_option_show_avatars', '__return_true' ); |
| 157 | } |
| 158 | $avatar = get_avatar( $author->user_email, $width ); |
| 159 | if ( !$has_filter ) { |
| 160 | remove_filter( 'pre_option_show_avatars', '__return_true' ); |
| 161 | } |
| 162 | |
| 163 | if ( !empty( $avatar ) && !is_wp_error( $avatar ) ) { |
| 164 | if ( preg_match( '/src=["\']([^"\']+)["\']/', $avatar, $matches ) ); |
| 165 | $image = wp_specialchars_decode( $matches[1], ENT_QUOTES ); |
| 166 | } |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | if ( empty( $image ) ) |
| 171 | $image = array(); |
| 172 | else if ( !is_array( $image ) ) |
| 173 | $image = array( $image ); |
| 174 | |
| 175 | // First fall back, blavatar |
| 176 | if ( empty( $image ) && function_exists( 'blavatar_domain' ) ) { |
| 177 | $blavatar_domain = blavatar_domain( site_url() ); |
| 178 | if ( blavatar_exists( $blavatar_domain ) ) |
| 179 | $image[] = blavatar_url( $blavatar_domain, 'img', $width ); |
| 180 | } |
| 181 | |
| 182 | // Second fall back, blank image |
| 183 | if ( empty( $image ) ) { |
| 184 | $image[] = "http://wordpress.com/i/blank.jpg"; |
| 185 | } |
| 186 | |
| 187 | return $image; |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * @param $email |
| 192 | * @param $width |
| 193 | * @return array|bool|mixed|string |
| 194 | */ |
| 195 | function jetpack_og_get_image_gravatar( $email, $width ) { |
| 196 | $image = ''; |
| 197 | if ( function_exists( 'get_avatar_url' ) ) { |
| 198 | $avatar = get_avatar_url($email, $width); |
| 199 | if ( ! empty( $avatar ) ) { |
| 200 | if ( is_array( $avatar ) ) |
| 201 | $image = $avatar[0]; |
| 202 | else |
| 203 | $image = $avatar; |
| 204 | } |
| 205 | } else { |
| 206 | $has_filter = has_filter( 'pre_option_show_avatars', '__return_true' ); |
| 207 | if ( !$has_filter ) { |
| 208 | add_filter( 'pre_option_show_avatars', '__return_true' ); |
| 209 | } |
| 210 | $avatar = get_avatar( $email, $width ); |
| 211 | |
| 212 | if ( !$has_filter ) { |
| 213 | remove_filter( 'pre_option_show_avatars', '__return_true' ); |
| 214 | } |
| 215 | |
| 216 | if ( !empty( $avatar ) && !is_wp_error( $avatar ) ) { |
| 217 | if ( preg_match( '/src=["\']([^"\']+)["\']/', $avatar, $matches ) ) |
| 218 | $image = wp_specialchars_decode($matches[1], ENT_QUOTES); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | return $image; |
| 223 | } |