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