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<?php
/* 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/docs/cards
*/
function wpcom_twitter_cards_tags( $og_tags ) {
global $post, $wpdb;
$og_tags['twitter:site'] = '@wordpressdotcom';
if ( ! is_singular() || ! empty( $og_tags['twitter:card'] ) )
return $og_tags;
$img_count = 0;
foreach ( $og_tags as $key => $value ) {
if ( 'og:image' != $key || ! is_array( $value ) || empty( $value[0] ) )
continue;
$img_count = 0;
foreach ( (array) $value as $counter => $image ) {
$og_tags['twitter:image' . $counter] = $image;
$img_count++;
if ( $img_count >= 4 )
break; // Only 4 images allowed
}
}
// Figure out what kind of card this is, based on the number of images found
if ( 0 == $img_count ) {
// No images = summary
$card = 'summary';
} else if ( $img_count <= 3 ) {
// < 4 images = photo
$card = 'photo';
$og_tags['twitter:image'] = $og_tags['twitter:image0']; // Rename back to photo format (from gallery)
unset( $og_tags['twitter:image0'] );
for ( $i = 1; $i < 4; $i++ ) {
unset( $og_tags['twitter:image' . $i] ); // Remove >0 image references
}
} else if ( $img_count >= 4 ) {
// >= 4 images = gallery
$card = 'gallery';
}
$og_tags['twitter:card'] = $card;
// If we have information on the author/creator, then include that as well
if ( ! empty( $post ) && ! empty( $post->post_author ) ) {
$handle = apply_filters( 'jetpack_sharing_twitter_via', '', $post->ID );
if ( !empty( $handle ) )
$og_tags['twitter:creator'] = '@' . $handle;
}
return $og_tags;
}
add_filter( 'jetpack_open_graph_tags', 'wpcom_twitter_cards_tags' );
function wpcom_twitter_cards_output( $og_tag ) {
return ( false !== strpos( $og_tag, 'twitter:' ) ) ? preg_replace( '/property="([^"]+)"/', 'name="\1"', $og_tag ) : $og_tag;
}
add_filter( 'jetpack_open_graph_output', 'wpcom_twitter_cards_output' );
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