elements used for Open Graph protocol.
*
* @since 1.0
*
* @param string $property whitespace separated list of CURIEs placed in a property attribute
* @param mixed content attribute value for the given property. use an array for array property values or structured properties
* @return void
*/
public static function meta_elements( $property, $content ) {
if ( empty( $property ) || empty( $content ) )
return;
// array of property values or structured property
if ( is_array( $content ) ) {
// account for the special structured property of url which is equivalent to the root tag and sets up the structure
// must appear before other attributes
if ( isset( $content['url'] ) ) {
self::meta_elements( $property, $content['url'] );
unset( $content['url'] );
}
foreach( $content as $structured_property => $content_value ) {
// handle numeric keys from regular arrays
if ( ! is_string( $structured_property ) )
self::meta_elements( $property, $content_value );
else
self::meta_elements( $property . ':' . $structured_property, $content_value );
}
} else {
echo '\n";
}
}
/**
* Clean post description text in preparation for Open Graph protocol description or Facebook post caption|description
*
* @since 1.1
*
* @uses strip_shortcodes()
* @uses wp_trim_words()
* @param string $description description text
* @return string description text passed through WordPress Core description cleaners, possibly trimmed
*/
public static function clean_description( $description, $trimmed = true ) {
$description = trim( $description );
if ( ! $description )
return '';
// basic filters from wp_trim_excerpt() that should apply to both excerpt and content
// note: the_content filter is so polluted with extra third-party stuff we purposely avoid to better represent page content
$description = strip_shortcodes( $description ); // remove any shortcodes that may exist, such as an image macro
$description = str_replace( ']]>', ']]>', $description );
$description = trim( $description );
if ( ! $description )
return '';
if ( $trimmed ) {
// use the built-in WordPress function for localized support of words vs. characters
// pass in customizations based on WordPress with publisher overrides
$description = wp_trim_words(
$description,
apply_filters( 'facebook_excerpt_length', apply_filters( 'excerpt_length', 55 ) ), // standard excerpt length, which may be customized by the publisher via the core filter, passed through another filter for our context
apply_filters( 'facebook_excerpt_more', __( '…' ) ) // filter the wp_trim_words default for publisher customization
);
} else {
$description = wp_strip_all_tags( $description );
}
if ( $description )
return $description;
return '';
}
/**
* Convert full IRI Open Graph protocol values to CURIE prefixed values
* Mapping CURIEs is presumed to occur in a parent element of the group of s
*
* @since 1.1.6
* @link http://www.w3.org/TR/rdfa-syntax/#s_curies RDFa 1.1 Core CURIEs
* @param array $ogp associative array of full IRI key and OGP value
* @return array associative array of full IRI replaced with prefix where mapped and the same OGP value passed in
*/
public static function prefixed_properties( $ogp ) {
global $facebook_loader;
if ( ! is_array( $ogp ) || empty( $ogp ) )
return array();
/**
* Map RDFa Core CURIEs and prefixes
*
* @since 1.1.6
*
* @param array {
* @type string RDFa CURIE
* @type array 'prefix' abbreviation recognized without a prefix mapping on a parent element
* }
*/
$curies = apply_filters( 'facebook_rdfa_mappings', array(
self::OGP_NS => array( 'prefix' => 'og' ),
self::FB_NS => array( 'prefix' => 'fb' ),
self::ARTICLE_NS => array( 'prefix' => 'article' ),
self::PROFILE_NS => array( 'prefix' => 'profile' ),
'http://ogp.me/ns/book#' => array( 'prefix' => 'book' ),
'http://ogp.me/ns/business#' => array( 'prefix' => 'business' ),
'http://ogp.me/ns/event#' => array( 'prefix' => 'event' ),
'http://ogp.me/ns/fitness#' => array( 'prefix' => 'fitness' ),
'http://ogp.me/ns/music#' => array( 'prefix' => 'music' ),
'http://ogp.me/ns/product#' => array( 'prefix' => 'product' ),
'http://ogp.me/ns/restaurant#' => array( 'prefix' => 'restaurant' ),
self::VIDEO_NS => array( 'prefix' => 'video' )
) );
if ( isset( $facebook_loader->credentials['app_namespace'] ) ) {
$app_ns_url = esc_url_raw( 'http://ogp.me/ns/fb/' . $facebook_loader->credentials['app_namespace'] . '#', array( 'http' ) );
if ( $app_ns_url && ! isset( $curies[$app_ns_url] ) )
$curies[$app_ns_url] = array( 'prefix' => $facebook_loader->credentials['app_namespace'] );
}
foreach ( $curies as $reference => $properties ) {
if ( ! isset( $properties['prefix'] ) ) {
unset( $curies[$reference] );
continue;
}
$properties['key_length'] = strlen( $reference );
$curies[$reference] = $properties;
}
$ogp_prefixed = array();
foreach ( $ogp as $property => $value ) {
$prefixed_property_set = false;
$property_length = strlen( $property );
foreach ( $curies as $reference => $properties ) {
if ( $property_length > $properties['key_length'] && substr_compare( $property, $reference, 0, $properties['key_length'] ) === 0 ) {
$ogp_prefixed[ $properties['prefix'] . ':' . substr( $property , $properties['key_length'] ) ] = $value;
$prefixed_property_set = true;
break;
}
}
unset( $property_length );
// pass through unmapped values
if ( ! $prefixed_property_set )
$ogp_prefixed[$property] = $value;
unset( $prefixed_property_set );
}
return $ogp_prefixed;
}
/**
* Add Open Graph protocol markup to
* We use full IRIs for consistent mapping between mapped CURIE prefixes defined in a parent element and self-contained properties using a full IRI
*
* @since 1.0
*
* @link http://www.w3.org/TR/rdfa-syntax/#s_curieprocessing RDFa Core 1.1 CURIE and IRI processing
* @global stdClass|WP_Post $post WordPress post object for the current view
* @global Facebook_Loader $facebook_loader
* @return void
*/
public static function add_og_protocol() {
global $post, $facebook_loader;
$meta_tags = array(
self::OGP_NS . 'site_name' => get_bloginfo( 'name' ),
self::OGP_NS . 'type' => 'website'
);
if ( isset( $facebook_loader ) ) {
if ( isset( $facebook_loader->locale ) )
$meta_tags[ self::OGP_NS . 'locale' ] = $facebook_loader->locale;
if ( isset( $facebook_loader->credentials ) && isset( $facebook_loader->credentials['app_id'] ) && $facebook_loader->credentials['app_id'] )
$meta_tags[ self::FB_NS . 'app_id' ] = $facebook_loader->credentials['app_id'];
}
if ( is_home() || is_front_page() ) {
$meta_tags[ self::OGP_NS . 'title' ] = get_bloginfo( 'name' );
$meta_tags[ self::OGP_NS . 'description' ] = get_bloginfo( 'description' );
$meta_tags[ self::OGP_NS . 'url' ] = home_url();
} else if ( is_singular() && empty( $post->post_password ) ) {
setup_postdata( $post );
$post_type = get_post_type( $post );
/**
* Canonical URL for the singular page.
*
* @since 1.1.6
* @param string absolute URI of the current post context
*/
$meta_tags[ self::OGP_NS . 'url' ] = apply_filters( 'facebook_rel_canonical', get_permalink( $post->ID ) );
if ( post_type_supports( $post_type, 'title' ) )
$meta_tags[ self::OGP_NS . 'title' ] = get_the_title();
if ( post_type_supports( $post_type, 'excerpt' ) ) {
$description = '';
// did the publisher specify a custom excerpt? use it
if ( ! empty( $post->post_excerpt ) )
$description = apply_filters( 'get_the_excerpt', $post->post_excerpt );
else
$description = $post->post_content;
$description = self::clean_description( $description );
if ( $description )
$meta_tags[ self::OGP_NS . 'description' ] = $description;
}
$meta_tags[ self::OGP_NS . 'type' ] = self::get_post_og_type( $post );
$images = self::get_og_images( $post );
if ( ! empty( $images ) )
$meta_tags[ self::OGP_NS . 'image' ] = array_values( $images );
unset( $images );
if ( $meta_tags[ self::OGP_NS . 'type' ] === 'article' ) {
// add article-specific properties
$meta_tags = array_merge( $meta_tags, self::get_article_properties( $post ) );
} else if ( $meta_tags[ self::OGP_NS . 'type' ] === 'video.other' ) {
// attempt to declare a video or videos
$videos = self::get_og_videos( $post );
if ( ! empty( $videos ) ) {
$videos = array_values( $videos );
if ( count( $videos ) === 1 ) {
$video = array_shift( $videos );
if ( $video && isset( $video[ self::VIDEO_NS ] ) ) {
foreach( $video[self::VIDEO_NS] as $property => $value ) {
$meta_tags[ self::VIDEO_NS . $property ] = $value;
}
unset( $video[ self::VIDEO_NS ] );
}
$meta_tags[ self::OGP_NS . 'video' ] = array( $video );
unset( $video );
} else {
$videos_only = array();
foreach( $videos as $video ) {
unset( $video[self::VIDEO_NS] );
$videos_only[] = $video;
}
$meta_tags[ self::OGP_NS . 'video' ] = $videos_only;
unset( $videos_only );
}
}
unset( $videos );
if ( empty( $meta_tags[ self::OGP_NS . 'video' ] ) ) {
// try to find well-known and easily mapped video provider WP_Embeds
$videos = self::get_embed_videos( $post );
if ( ! empty( $videos ) ) {
foreach( $videos as $video_url => $video ) {
if ( empty( $video ) )
continue;
if ( isset( $video['image'] ) ) {
$meta_tags[ self::OGP_NS . 'image' ][] = $video['image'];
unset( $video['image'] );
}
$meta_tags[ self::OGP_NS . 'video' ] = array_values( $video );
}
}
unset( $videos );
}
}
// include MP3s for audio post formats
if ( has_post_format( 'audio', $post ) ) {
$audios = self::get_og_audio( $post );
if ( ! empty( $audios ) )
$meta_tags[ self::OGP_NS . 'audio' ] = array_values( $audios );
unset( $audios );
}
if ( post_type_supports( $post_type, 'author' ) && isset( $post->post_author ) ) {
// Facebook user helper
if ( ! class_exists( 'Facebook_User' ) )
require_once( $facebook_loader->plugin_directory . 'facebook-user.php' );
$facebook_user_data = Facebook_User::get_user_meta( $post->post_author, 'fb_data', true );
$author_fbid = '';
if ( is_array( $facebook_user_data ) && isset( $facebook_user_data['fb_uid'] ) )
$author_fbid = $facebook_user_data['fb_uid'];
unset( $facebook_user_data );
if ( $author_fbid ) {
$meta_tags[ self::FB_NS . 'profile_id' ] = $author_fbid;
// adding an fb:admin grants comment moderation permissions for Comment Box
if ( get_option( 'facebook_comments_enabled' ) && user_can( $post->post_author, 'moderate_comments' ) ) {
if ( ! class_exists( 'Facebook_Comments' ) )
require_once( $facebook_loader->plugin_directory . 'social-plugins/class-facebook-comments.php' );
if ( Facebook_Comments::comments_enabled_for_post_type( $post ) )
$meta_tags[ self::FB_NS . 'admins' ] = $author_fbid;
}
}
unset( $author_fbid );
}
} else if ( is_author() ) {
$author = get_queried_object();
if ( $author && isset( $author->ID ) ) {
$author_id = $author->ID;
$meta_tags[ self::OGP_NS . 'type' ] = 'profile';
$meta_tags[ self::OGP_NS . 'title' ] = get_the_author_meta( 'display_name', $author_id );
$meta_tags[ self::OGP_NS . 'url' ] = get_author_posts_url( get_the_author_meta( 'ID', $author_id ) );
$meta_tags[ self::PROFILE_NS . 'first_name' ] = get_the_author_meta( 'first_name', $author_id );
$meta_tags[ self::PROFILE_NS . 'last_name'] = get_the_author_meta( 'last_name', $author_id );
$description = self::clean_description( get_the_author_meta( 'description', $author_id ) );
if ( $description )
$meta_tags[ self::OGP_NS . 'description'] = $description;
// Facebook user helper
if ( ! class_exists( 'Facebook_User' ) )
require_once( $facebook_loader->plugin_directory . 'facebook-user.php' );
$facebook_user_data = Facebook_User::get_user_meta( $author_id, 'fb_data', true );
if ( is_array( $facebook_user_data ) && isset( $facebook_user_data['fb_uid'] ) )
$meta_tags[ self::FB_NS . 'profile_id' ] = $facebook_user_data['fb_uid'];
unset( $facebook_user_data );
// no need to show username if there is only one
if ( is_multi_author() )
$meta_tags[ self::PROFILE_NS . 'username' ] = get_the_author_meta( 'login', $author_id );
}
unset( $author );
} else if ( is_page() ) {
$meta_tags[ self::OGP_NS . 'type' ] = 'article';
$meta_tags[ self::OGP_NS . 'title' ] = get_the_title();
// duplicate_hook
$meta_tags[ self::OGP_NS . 'url' ] = apply_filters( 'facebook_rel_canonical', get_permalink() );
}
/**
* Customize Open Graph protocol for the site or page before output.
*
* Add, change, and delete Open Graph protocol values used to summarize a link shared on Facebook and create new Open Graph objects.
*
* @since 1.0
* @param array $meta_tags {
* Open Graph protocol values to be output
*
* @type string Full IRI RDFa Core property
* @type mixed property value or multiple values
* }
* @param stdClass|WP_Post $post the current post global if set
*/
$meta_tags = apply_filters( 'fb_meta_tags', $meta_tags, $post );
/**
* Control auto-prefixing or full IRI RDFa Core 1.1 properties output for the page.
*
* Use prefixed values (e.g. og:image) by default to maximize compatibility with indexers. Assumes prefix CURIE mappings will be set on or to properly map the prefixes or the publisher is not concerned with RDFa Core 1.1 compatibility and reserved prefixes.
*
* @since 1.1.6
* @param bool default true
*/
if ( apply_filters( 'facebook_ogp_prefixed', true ) )
$meta_tags = self::prefixed_properties( $meta_tags );
foreach ( $meta_tags as $property => $content ) {
self::meta_elements( $property, $content );
}
}
/**
* Classify the current post as an Open Graph object type.
*
* @since 1.5
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/ Facebook global object types
* @param stdClass|WP_Post $post the post to classify
* @return string Open Graph protocol type property value
*/
public static function get_post_og_type( $post ) {
$og_type = 'website';
if ( ! ( $post && isset( $post->ID ) ) )
return $og_type;
// treat video post format as OG type video
if ( has_post_format( 'video', $post ) )
$og_type = 'video.other';
else if ( get_post_type( $post ) === 'post' )
$og_type = 'article';
$og_type = apply_filters( 'facebook_og_type', $og_type, $post );
if ( ! $og_type )
$og_type = 'website';
return $og_type;
}
/**
* Map WordPress post data to Open Graph article object properties.
*
* @since 1.5
*
* @param stdClass|WP_Post $post the post of interest
* @return array {
* Associative array of OGP properties and values related to the post
*
* @type string Full IRI Open Graph protocol property
* @type string|array Open Graph protocol property value
* }
*/
public static function get_article_properties( $post ) {
global $facebook_loader;
$ogp = array(
self::ARTICLE_NS . 'published_time' => date( 'c', strtotime( $post->post_date_gmt ) ),
self::ARTICLE_NS . 'modified_time' => date( 'c', strtotime( $post->post_modified_gmt ) )
);
if ( post_type_supports( get_post_type( $post ), 'author' ) && isset( $post->post_author ) ) {
if ( ! class_exists( 'Facebook_User' ) )
require_once( $facebook_loader->plugin_directory . 'facebook-user.php' );
$facebook_user_data = Facebook_User::get_user_meta( $post->post_author, 'fb_data', true );
if ( is_array( $facebook_user_data ) && isset( $facebook_user_data['link'] ) )
$ogp[ self::ARTICLE_NS . 'author' ] = $facebook_user_data['link'];
else
$ogp[ self::ARTICLE_NS . 'author' ] = get_author_posts_url( $post->post_author );
unset( $facebook_user_data );
}
$facebook_page = get_option( 'facebook_publish_page' );
if ( is_array( $facebook_page ) && isset( $facebook_page['link'] ) )
$ogp[ self::ARTICLE_NS . 'publisher' ] = $facebook_page['link'];
unset( $facebook_page );
// add the first category as a section. all other categories as tags
$cat_ids = get_the_category( $post->ID );
if ( ! empty( $cat_ids ) ) {
$no_category = apply_filters( 'the_category', __( 'Uncategorized' ) );
$cat = get_category( $cat_ids[0] );
if ( ! empty( $cat ) && isset( $cat->name ) && $cat->name !== $no_category )
$ogp[ self::ARTICLE_NS . 'section' ] = $cat->name;
// output the rest of the categories as tags
unset( $cat_ids[0] );
if ( ! empty( $cat_ids ) ) {
$ogp[ self::ARTICLE_NS . 'tag' ] = array();
foreach( $cat_ids as $cat_id ) {
$cat = get_category( $cat_id );
if ( isset( $cat->name ) && $cat->name !== $no_category )
$ogp[ self::ARTICLE_NS . 'tag' ][] = $cat->name;
unset( $cat );
}
}
}
// add tags. treat tags as lower priority than multiple categories
$tags = get_the_tags( $post->ID );
if ( $tags ) {
if ( ! isset( $ogp[ self::ARTICLE_NS . 'tag' ] ) )
$ogp[ self::ARTICLE_NS . 'tag' ] = array();
foreach ( $tags as $tag ) {
$ogp[ self::ARTICLE_NS . 'tag' ][] = $tag->name;
}
}
return $ogp;
}
/**
* Extract Open Graph protocol image information from a WordPress image attachment.
*
* @since 1.5
*
* @uses wp_get_attachment_image_src()
* @param int $attachment_id post id of the attachment object
* @param string $size requested size. one of thumbnail, medium, large, or full
* @return array {
* Attachment converted into image, width, and height values or empty if no image data found or minimum requirements not met
*
* @type string 'url' Full URI of the attachment for the requested size
* @type int 'width' Width of the image in whole pixels
* @type int 'height' Height of the image in whole pixels
* }
*/
public static function attachment_to_og_image( $attachment_id, $size = 'full' ) {
if ( ! ( is_string( $size ) && $size ) )
$size = 'full';
$image = array();
list( $attachment_url, $attachment_width, $attachment_height ) = wp_get_attachment_image_src( $attachment_id, $size );
if ( empty( $attachment_url ) )
return $image;
$image['url'] = $attachment_url;
if ( ! empty( $attachment_width ) ) {
$image['width'] = absint( $attachment_width );
if ( ! $image['width'] )
unset( $image['width'] );
else if ( $image['width'] < self::MIN_IMAGE_DIMENSION )
return array();
}
if ( ! empty( $attachment_height ) ) {
$image['height'] = absint( $attachment_height );
if ( ! $image['height'] )
unset( $image['height'] );
else if ( $image['height'] < self::MIN_IMAGE_DIMENSION )
return array();
}
return $image;
}
/**
* Identify image attachments related to the post.
*
* Request the full size of the attachment, not necessarily the same as the size used in the post.
*
* @since 1.5
*
* @param stdClass|WP_Post $post WordPress post of interest
* @return array {
* Open Graph protocol image structured data
*
* @type string URL of the image
* @type array associative array of image data
* }
*/
public static function get_og_images( $post ) {
$og_images = array();
if ( ! $post || ! isset( $post->ID ) )
return $og_images;
// does current post type and the current theme support post thumbnails?
if ( post_type_supports( get_post_type( $post ), 'thumbnail' ) && function_exists( 'has_post_thumbnail' ) && has_post_thumbnail() ) {
list( $post_thumbnail_url, $post_thumbnail_width, $post_thumbnail_height ) = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'full' );
$image = self::attachment_to_og_image( get_post_thumbnail_id( $post->ID ) );
if ( isset( $image['url'] ) && ! isset( $og_images[ $image['url'] ] ) )
$og_images[ $image['url'] ] = $image;
unset( $image );
}
// get image attachments
if ( function_exists( 'get_attached_media' ) ) {
$images = get_attached_media( 'image', $post->ID );
if ( ! empty( $images ) ) {
foreach( $images as $i ) {
if ( ! isset( $i->ID ) )
continue;
$image = self::attachment_to_og_image( $i->ID );
if ( ! isset( $image['url'] ) || isset( $og_images[ $image['url'] ] ) )
continue;
$og_images[ $image['url'] ] = $image;
if ( count( $og_images ) === self::MAX_IMAGE_COUNT )
return $og_images;
}
}
unset( $images );
}
// test for WP_Embed handled images
if ( ! empty( $post->post_content ) ) {
// Instagram
preg_match_all( '#\s*http://instagr(\.am|am\.com)/p/(.*)/\s*#i', $post->post_content, $matches );
if ( isset( $matches[2] ) ) {
foreach( $matches[2] as $instagram_id ) {
$instagram_url = esc_url_raw( 'http://instagram.com/p/' . $instagram_id . '/media/?size=l', array( 'http' ) );
if ( ! $instagram_url || isset( $og_images[$instagram_url] ) )
continue;
$og_images[$instagram_url] = array( 'url' => $instagram_url );
unset( $instagram_url );
}
}
unset( $matches );
}
// add gallery content
if ( function_exists( 'get_post_galleries' ) ) {
// use get_post_galleries function from WP 3.6+
$galleries = get_post_galleries( $post, false );
foreach( $galleries as $gallery ) {
// use ids to request full-size image URI
if ( ! ( isset( $gallery['ids'] ) && $gallery['ids'] ) )
continue;
$gallery['ids'] = explode( ',', $gallery['ids'] );
foreach( $gallery['ids'] as $attachment_id ) {
$image = self::attachment_to_og_image( $attachment_id );
if ( ! isset( $image['url'] ) || isset( $og_images[ $image['url'] ] ) )
continue;
$og_images[ $image['url'] ] = $image;
if ( count( $og_images ) === self::MAX_IMAGE_COUNT )
return $og_images;
unset( $image );
}
}
unset( $galleries );
} else {
// extract full-size images from gallery shortcode
$og_images = self::gallery_images( $post, $og_images );
}
return $og_images;
}
/**
* Identify video attachments related to the post.
*
* Prefer SWF and MP4 videos.
*
* @since 1.5
*
* @param stdClass|WP_Post $post WordPress post of interest
* @return array {
* Array of associative arrays containing OGP video structured data
*
* @type string URL of the video
* @type array Open Graph protocol video properties with possible video object namespaced properties
* }
*/
public static function get_og_videos( $post ) {
$og_videos = array();
if ( ! $post )
return $og_videos;
if ( function_exists( 'get_attached_media' ) ) {
$videos = get_attached_media( 'video', $post->ID );
foreach( $videos as $video ) {
if ( ! isset( $video->ID ) )
continue;
$url = wp_get_attachment_url( $video->ID );
if ( ! $url || isset( $og_videos[ $url ] ) )
continue;
$og_video = array( 'url' => $url );
unset( $url );
if ( isset( $video->post_mime_type ) && $video->post_mime_type )
$og_video['type'] = $video->post_mime_type;
$meta = wp_get_attachment_metadata( $video->ID );
if ( is_array( $meta ) ) {
if ( isset( $meta['width'] ) && isset( $meta['height'] ) ) {
$meta['width'] = absint( $meta['width'] );
$meta['height'] = absint( $meta['height'] );
if ( $meta['width'] < self::MIN_IMAGE_DIMENSION || $meta['height'] < self::MIN_IMAGE_DIMENSION )
continue;
$og_video['width'] = $meta['width'];
$og_video['height'] = $meta['height'];
}
if ( isset( $meta['length'] ) ) {
$meta['length'] = absint( $meta['length'] );
if ( $meta['length'] > 0 )
$og_video[ self::VIDEO_NS ]['duration'] = $meta['length'];
}
}
unset( $meta );
$og_videos[ $og_video['url'] ] = $og_video;
unset( $og_video );
}
unset( $videos );
}
return $og_videos;
}
/**
* Convert popular video providers to SWF and image URLs
*
* @since 1.5.3
*
* @param stdClass|WP_Post $post WordPress post of interest
* @return array {
* Array of associative arrays containing OGP video structured data for WP_Embed autolinked providers
*
* @type string URL of the video
* @type array Open Graph protocol video properties with possible 'image' key containing an og:image strutured data array for the video
* }
*/
public static function get_embed_videos( $post ) {
$og_videos = array();
if ( ! ( isset( $post->post_content ) && $post->post_content ) )
return $og_videos;
// @see WP_Embed::autoembed()
preg_match_all( '|^\s*(https?://[^\s"]+)\s*$|im', $post->post_content, $embed_urls );
if ( ! isset( $embed_urls[1] ) )
return $og_videos;
$embed_urls = array_unique( $embed_urls[1], SORT_STRING );
foreach( $embed_urls as $embed_url ) {
if ( preg_match( '#^https?://www\.youtube\.com/watch\?(.*)#i', $embed_url, $matches ) ) {
parse_str( $matches[1], $youtube_parameters );
if ( isset( $youtube_parameters['v'] ) && $youtube_parameters['v'] )
$og_videos = self::youtube_video_to_open_graph( $youtube_parameters['v'], $og_videos );
unset( $youtube_parameters );
} else if ( preg_match( '#^http://youtu\.be/(.*)#i', $embed_url, $matches ) ) {
$og_videos = self::youtube_video_to_open_graph( $matches[1], $og_videos );
} else if ( preg_match( '#^https?://(www\.)?vimeo\.com/([0-9]+)\??#i', $embed_url, $matches ) ) {
$og_videos = self::vimeo_video_to_open_graph( $matches[2], $og_videos );
}
}
return $og_videos;
}
/**
* Identify MP3 (audio/mpeg) attachments related to the post.
*
* @since 1.5
*
* @param stdClass|WP_Post $post WordPress post of interest
* @return array {
* Array of associative arrays containing OGP audio structured data
*
* @type string URL of the audio file
* @type array Open Graph protocol audio properties
* }
*/
public static function get_og_audio( $post ) {
$og_audios = array();
if ( ! $post )
return $og_audios;
if ( function_exists( 'get_attached_media' ) ) {
$audios = get_attached_media( 'audio/mpeg', $post->ID );
foreach ( $audios as $audio ) {
$url = wp_get_attachment_url( $audio->ID );
if ( ! $url || isset( $og_audios[ $url ] ) )
continue;
$og_audio = array( 'url' => $url );
unset( $url );
if ( isset( $audio->post_mime_type ) && $audio->post_mime_type )
$og_audio['type'] = $audio->post_mime_type;
$og_audios[ $og_audio['url'] ] = $og_audio;
unset( $og_audio );
}
unset( $audios );
}
return $og_audios;
}
/**
* Find gallery shortcodes in the post. Build Open Graph protocol image results.
*
* Used if get_post_galleries() is not present (adds support for WordPress < 3.6).
*
* @since 1.1.9
*
* @param stdClass|WP_Post $post current post object
* @param array $existing_images add to an existing list of images. Check for duplication.
* @return array {
* Array of arrays containing Open Graph protocol image markup
*
* @type string URL of the image
* @type array Open Graph protocol image properties
* }
*/
public static function gallery_images( $post, $existing_images = array() ) {
global $shortcode_tags;
if ( ! is_array( $existing_images ) )
$existing_images = array();
$og_images = array();
if ( ! ( isset( $shortcode_tags['gallery'] ) && isset( $post->post_content ) && $post->post_content ) )
return $og_images;
$first_gallery = strpos( $post->post_content, '[gallery' );
if ( $first_gallery === false )
return $og_images;
// use regex finder with only the gallery shortcode
$old_shortcodes = $shortcode_tags;
$shortcode_tags = array( 'gallery' => $shortcode_tags['gallery'] );
// find all the gallery shortcodes in the post content
preg_match_all( '/' . get_shortcode_regex() . '/s', $post->post_content, $galleries, PREG_SET_ORDER, $first_gallery );
// reset
$shortcode_tags = $old_shortcodes;
foreach( $galleries as $gallery_shortcode ) {
// request the full-sized image
if ( empty( $gallery_shortcode[3] ) ) {
$gallery_shortcode[3] = ' size="full"';
} else {
// break it down
$parsed_attributes = shortcode_parse_atts( $gallery_shortcode[3] );
// add new attribute or override existing
$parsed_attributes['size'] = 'full';
// build it up again
$attr_str = '';
foreach ( $parsed_attributes as $attribute => $value ) {
$attr_str .= ' ' . $attribute . '="' . $value . '"';
}
unset( $parsed_attributes );
if ( $attr_str )
$gallery_shortcode[3] = $attr_str;
unset( $attr_str );
}
// pass the shortcode through all filters and actors
$gallery_html = do_shortcode_tag( $gallery_shortcode );
if ( ! $gallery_html )
continue;
$gallery_html = strip_tags( $gallery_html, '![]()
' );
if ( ! $gallery_html )
continue;
$first_image = strpos( $gallery_html, ']+>/i', $gallery_html, $images, PREG_PATTERN_ORDER, $first_image );
unset( $gallery_html );
if ( ! ( is_array( $images ) && is_array( $images[0] ) ) )
continue;
$images = $images[0];
foreach ( $images as $image ) {
preg_match_all( '/(src|width|height)="([^"]*)"/i', $image, $image_attributes, PREG_SET_ORDER );
$og_image = array();
foreach( $image_attributes as $parsed_attributes ) {
if ( $parsed_attributes[1] === 'src' ) {
$url = esc_url_raw( wp_specialchars_decode( $parsed_attributes[2] ), array( 'http', 'https' ) );
if ( $url )
$og_image['url'] = $url;
unset( $url );
} else if ( $parsed_attributes[1] === 'width' || $parsed_attributes[1] === 'height' ) {
$pixels = absint( $parsed_attributes[2] );
if ( $pixels > 0 )
$og_image[ $parsed_attributes[1] ] = $pixels;
unset( $pixels );
}
}
if ( ! isset( $og_image['url'] ) || isset( $existing_images[ $og_image['url'] ] ) || ( isset( $og_image['width'] ) && $og_image['width'] < self::MIN_IMAGE_DIMENSION ) || ( isset( $og_image['height'] ) && $og_image['height'] < self::MIN_IMAGE_DIMENSION ) )
continue;
$existing_images[ $og_image['url'] ] = $og_image;
unset( $og_image );
if ( count( $existing_images ) === self::MAX_IMAGE_COUNT )
return $existing_images;
}
}
return $existing_images;
}
/**
* Build Open Graph protocol markup for a single YouTube video identifier.
*
* @since 1.5.3
*
* @link https://developers.google.com/youtube/player_parameters YouTube Embedded Player Parameters
* @param string $youtube_id YouTube video identifier
* @param array $exiting_videos Existing matched videos. Avoid duplication by comparing YouTube HTML embed URIs
* @return array Passed 'existing_videos' array with a possible YouTube video added
*/
public static function youtube_video_to_open_graph( $youtube_id, $og_videos = array() ) {
if ( ! is_array( $og_videos ) )
$og_videos = array();
if ( ! ( is_string( $youtube_id ) && $youtube_id ) )
return $og_videos;
$iframe_url = esc_url_raw( 'https://www.youtube.com/embed/' . $youtube_id . '?autoplay=1&rel=0', array( 'https' ) );
if ( ! $iframe_url || isset( $og_videos[ $iframe_url ] ) )
return $existing_videos;
$flash_url = esc_url_raw( 'https://www.youtube.com/v/' . $youtube_id . '?version=3&autoplay=1&rel=0', array( 'https' ) );
if ( ! $flash_url )
return $og_videos;
$og_videos[ $iframe_url ] = array(
'html' => array(
'url' => $iframe_url,
'type' => 'text/html'
),
'swf' => array(
'url' => $flash_url,
'type' => 'application/x-shockwave-flash'
)
);
$image_url = esc_url_raw( 'http://img.youtube.com/vi/' . $youtube_id . '/sddefault.jpg', array( 'http', 'https' ) );
if ( $image_url ) {
$og_videos[ $iframe_url ]['image'] = array( 'url' => $image_url );
}
return $og_videos;
}
/**
* Build Open Graph protocol markup for a single Vimeo video identifier.
*
* Note: this function does not query the Vimeo API and therefore does not include a thumbnail image for the video. For best results be sure to set your own og:image.
*
* @since 1.5.3
*
* @link http://developer.vimeo.com/player/embedding Vimeo Embedded Player documentation
* @param string $vimeo_id Vimeo video identifier
* @param array $exiting_videos Existing matched videos. Avoid duplication by comparing Vimeo HTML embed URIs
* @return array Passed 'existing_videos' array with a possible Vimeo video added
*/
public static function vimeo_video_to_open_graph( $vimeo_id, $og_videos = array() ){
if ( ! is_array( $og_videos ) )
$og_videos = array();
if ( ! ( is_string( $vimeo_id ) && $vimeo_id ) )
return $og_videos;
$iframe_url = esc_url_raw( 'https://player.vimeo.com/video/' . $vimeo_id . '?autoplay=1', array( 'https' ) );
if ( ! $iframe_url || isset( $og_videos[ $iframe_url ] ) )
return $og_videos;
$flash_url = esc_url_raw( 'https://vimeo.com/moogaloop.swf?' . http_build_query( array( 'clip_id' => $vimeo_id, 'autoplay' => 1 ), '', '&' ), array( 'https' ) );
if ( ! $flash_url )
return $og_videos;
$og_videos[ $iframe_url ] = array(
'html' => array(
'url' => $iframe_url,
'type' => 'text/html'
),
'swf' => array(
'url' => $flash_url,
'type' => 'application/x-shockwave-flash'
)
);
return $og_videos;
}
}
?>