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opengraph.php
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opengraph.php
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<?php
/**
* Plugin Name: Open Graph
* Plugin URI: https://wordpress.org/plugins/opengraph
* Description: Adds Open Graph metadata to your pages
* Author: Will Norris
* Author URI: https://willnorris.com/
* Version: 1.11.3
* License: Apache License, Version 2.0
* License URI: http://www.apache.org/licenses/LICENSE-2.0.html
* Text Domain: opengraph
*/
// If you have the opengraph plugin running alongside jetpack, we assume you'd
// rather use our opengraph support, so disable jetpack's opengraph functionality.
add_filter( 'jetpack_enable_opengraph', '__return_false' );
add_filter( 'jetpack_enable_open_graph', '__return_false' );
// Disable strict mode by default.
if ( ! defined( 'OPENGRAPH_STRICT_MODE' ) ) {
define( 'OPENGRAPH_STRICT_MODE', false );
}
/**
* Add Open Graph XML prefix to <html> element.
*
* @uses apply_filters calls 'opengraph_prefixes' filter on RDFa prefix array
*/
function opengraph_add_prefix( $output ) {
$prefixes = array(
'og' => 'http://ogp.me/ns#',
);
$prefixes = apply_filters( 'opengraph_prefixes', $prefixes );
$prefix_str = '';
foreach ( $prefixes as $k => $v ) {
$prefix_str .= $k . ': ' . $v . ' ';
}
$prefix_str = trim( $prefix_str );
if ( preg_match( '/(prefix\s*=\s*[\"|\'])/i', $output ) ) {
$output = preg_replace( '/(prefix\s*=\s*[\"|\'])/i', '${1}' . $prefix_str, $output );
} else {
$output .= ' prefix="' . esc_attr( $prefix_str ) . '"';
}
return $output;
}
add_filter( 'language_attributes', 'opengraph_add_prefix' );
/**
* Add additional prefix namespaces that are supported by the opengraph plugin.
*/
function opengraph_additional_prefixes( $prefixes ) {
if ( is_author() ) {
$prefixes['profile'] = 'http://ogp.me/ns/profile#';
}
if ( is_singular() ) {
$prefixes['article'] = 'http://ogp.me/ns/article#';
}
return $prefixes;
}
/**
* Get the Open Graph metadata for the current page.
*
* @uses apply_filters() Calls 'opengraph_{$name}' for each property name
* @uses apply_filters() Calls 'twitter_{$name}' for each property name
* @uses apply_filters() Calls 'opengraph_metadata' before returning metadata array
*/
function opengraph_metadata() {
$metadata = array();
// default properties defined at http://ogp.me/
$properties = array(
// required
'title',
'type',
'image',
'url',
// optional
'audio',
'description',
'determiner',
'locale',
'site_name',
'video',
);
foreach ( $properties as $property ) {
$filter = 'opengraph_' . $property;
$metadata[ "og:$property" ] = apply_filters( $filter, '' );
}
$twitter_properties = array( 'card', 'creator' );
foreach ( $twitter_properties as $property ) {
$filter = 'twitter_' . $property;
$metadata[ "twitter:$property" ] = apply_filters( $filter, '' );
}
return apply_filters( 'opengraph_metadata', $metadata );
}
/**
* Register filters for default Open Graph metadata.
*/
function opengraph_default_metadata() {
// core metadata attributes
add_filter( 'opengraph_title', 'opengraph_default_title', 5 );
add_filter( 'opengraph_type', 'opengraph_default_type', 5 );
add_filter( 'opengraph_image', 'opengraph_default_image', 5 );
add_filter( 'opengraph_url', 'opengraph_default_url', 5 );
add_filter( 'opengraph_description', 'opengraph_default_description', 5 );
add_filter( 'opengraph_locale', 'opengraph_default_locale', 5 );
add_filter( 'opengraph_site_name', 'opengraph_default_sitename', 5 );
add_filter( 'opengraph_audio', 'opengraph_default_audio', 5 );
add_filter( 'opengraph_video', 'opengraph_default_video', 5 );
// additional prefixes
add_filter( 'opengraph_prefixes', 'opengraph_additional_prefixes' );
// additional profile metadata
add_filter( 'opengraph_metadata', 'opengraph_profile_metadata' );
// additional article metadata
add_filter( 'opengraph_metadata', 'opengraph_article_metadata' );
// twitter card metadata
add_filter( 'twitter_card', 'twitter_default_card', 5 );
add_filter( 'twitter_creator', 'twitter_default_creator', 5 );
}
add_action( 'wp', 'opengraph_default_metadata' );
/**
* Default title property, using the page title.
*/
function opengraph_default_title( $title ) {
if ( $title ) {
return $title;
}
// set default title, because twitter is requiring one
$title = __( 'Untitled', 'opengraph' );
if ( is_home() || is_front_page() ) {
$title = get_bloginfo( 'name' );
} elseif ( is_singular() ) {
$title = get_the_title( get_queried_object_id() );
// fall back to description
if ( empty( $title ) ) {
$title = opengraph_default_description( null, 5 );
}
} elseif ( is_author() ) {
$author = get_queried_object();
$title = $author->display_name;
} elseif ( is_category() && single_cat_title( '', false ) ) {
$title = single_cat_title( '', false );
} elseif ( is_tag() && single_tag_title( '', false ) ) {
$title = single_tag_title( '', false );
} elseif ( is_archive() && get_post_format() ) {
$title = get_post_format_string( get_post_format() );
} elseif ( is_archive() && function_exists( 'get_the_archive_title' ) && get_the_archive_title() ) { // new in version 4.1 to get all other archive titles
$title = get_the_archive_title();
}
return wp_strip_all_tags( $title );
}
/**
* Default type property.
*/
function opengraph_default_type( $type ) {
if ( empty( $type ) ) {
if ( is_singular( array( 'post', 'page' ) ) ) {
$type = 'article';
} elseif ( is_author() ) {
$type = 'profile';
} else {
$type = 'website';
}
}
return $type;
}
/**
* Default image property, using the post-thumbnail and any attached images.
*/
function opengraph_default_image( $image ) {
if ( $image ) {
return $image;
}
// show avatar on profile pages
if ( is_author() ) {
return get_avatar_url( get_the_author_meta( 'ID' ), array( 'size' => 512 ) );
}
// As of July 2014, Facebook seems to only let you select from the first 3 images
$max_images = apply_filters( 'opengraph_max_images', 3 );
// max images can't be negative or zero
if ( $max_images <= 0 ) {
$max_images = 1;
}
if ( is_singular() && ! is_attachment() ) {
$id = get_queried_object_id();
$image_ids = array();
// list post thumbnail first if this post has one
if ( function_exists( 'has_post_thumbnail' ) && has_post_thumbnail( $id ) ) {
$image_ids[] = get_post_thumbnail_id( $id );
} else {
// otherwise list any image attachments
$query = new WP_Query(
array(
'post_parent' => $id,
'post_status' => 'inherit',
'post_type' => 'attachment',
'post_mime_type' => 'image',
'order' => 'ASC',
'orderby' => 'menu_order ID',
'posts_per_page' => $max_images,
)
);
foreach ( $query->get_posts() as $attachment ) {
if ( ! in_array( $attachment->ID, $image_ids, true ) ) {
$image_ids[] = $attachment->ID;
}
}
}
// get URLs for each image
$image = array();
foreach ( $image_ids as $id ) {
$thumbnail = wp_get_attachment_image_src( $id, 'full' );
if ( $thumbnail ) {
$image[] = $thumbnail[0];
}
}
} elseif ( is_attachment() && wp_attachment_is_image() ) {
$id = get_queried_object_id();
$image = array( wp_get_attachment_url( $id ) );
}
if ( empty( $image ) ) {
$image = array();
// add header images
if ( function_exists( 'get_uploaded_header_images' ) ) {
if ( is_random_header_image() ) {
foreach ( get_uploaded_header_images() as $header_image ) {
$image[] = $header_image['url'];
if ( sizeof( $image ) >= $max_images ) {
break;
}
}
} elseif ( get_header_image() ) {
$image[] = get_header_image();
}
}
// add site icon
if ( empty( $image ) && function_exists( 'get_site_icon_url' ) && has_site_icon() ) {
$image[] = get_site_icon_url( 512 );
}
}
return $image;
}
/**
* Default audio property, using get_attached_media.
*/
function opengraph_default_audio( $audio ) {
$id = get_queried_object_id();
$attachments = get_attached_media( 'audio', $id );
if ( empty( $attachments ) ) {
return $audio;
}
if ( empty( $audio ) ) {
$audio = array();
}
foreach ( $attachments as $attachment ) {
$audio[] = wp_get_attachment_url( $attachment->ID );
}
return $audio;
}
/**
* Default video property, using get_attached_media.
*/
function opengraph_default_video( $video ) {
$id = get_queried_object_id();
$attachments = get_attached_media( 'video', $id );
if ( empty( $attachments ) ) {
return $video;
}
if ( empty( $video ) ) {
$video = array();
}
foreach ( $attachments as $attachment ) {
$video[] = wp_get_attachment_url( $attachment->ID );
}
return $video;
}
/**
* Default url property, using the permalink for the page.
*/
function opengraph_default_url( $url ) {
if ( empty( $url ) ) {
if ( is_singular() ) {
$url = get_permalink();
} elseif ( is_author() ) {
$url = get_author_posts_url( get_queried_object_id() );
}
}
return esc_url( $url );
}
/**
* Default site_name property, using the bloginfo name.
*/
function opengraph_default_sitename( $name ) {
if ( empty( $name ) ) {
$name = get_bloginfo( 'name' );
}
return wp_strip_all_tags( $name );
}
/**
* Default description property, using the excerpt or content for posts, or the
* bloginfo description.
*/
function opengraph_default_description( $description, $length = 55 ) {
if ( $description ) {
return $description;
}
if ( is_singular() ) {
$post = get_queried_object();
if ( post_password_required( $post ) ) {
$description = __( 'This content is password protected.' );
} else if ( ! empty( $post->post_excerpt ) ) {
$description = $post->post_excerpt;
} else {
$description = $post->post_content;
}
} elseif ( is_author() ) {
$id = get_queried_object_id();
$description = get_user_meta( $id, 'description', true );
} elseif ( is_category() && category_description() ) {
$description = category_description();
} elseif ( is_tag() && tag_description() ) {
$description = tag_description();
} elseif ( is_archive() && function_exists( 'get_the_archive_description' ) && get_the_archive_description() ) { // new in version 4.1 to get all other archive descriptions
$description = get_the_archive_description();
} else {
$description = get_bloginfo( 'description' );
}
// strip description to first 55 words.
$description = strip_tags( strip_shortcodes( $description ) );
$description = opengraph_trim_text( $description, $length );
return wp_strip_all_tags( $description );
}
/**
* Default locale property, using the WordPress locale.
*/
function opengraph_default_locale( $locale ) {
if ( empty( $locale ) ) {
$locale = get_locale();
}
return $locale;
}
/**
* Default twitter-card type.
*/
function twitter_default_card( $card ) {
if ( $card ) {
return $card;
}
$card = 'summary';
$images = opengraph_default_image( null );
// show large image on...
if ( is_singular() ) {
if (
// gallery and image posts
in_array( get_post_format(), array( 'image', 'gallery' ), true ) ||
// posts with more than one image
( is_array( $images ) && count( $images ) > 1 ) ||
// posts with a post-thumbnail
( function_exists( 'has_post_thumbnail' ) && has_post_thumbnail() )
) {
$card = 'summary_large_image';
}
}
return $card;
}
/**
* Default twitter-card creator.
*/
function twitter_default_creator( $creator ) {
if ( $creator || ! is_singular() ) {
return $creator;
}
$post = get_queried_object();
$author = $post->post_author;
$twitter = get_the_author_meta( 'twitter', $author );
if ( ! $twitter ) {
return $creator;
}
// check if twitter-account matches "http://twitter.com/username"
if ( preg_match( '/^http:\/\/twitter\.com\/(#!\/)?(\w+)/i', $twitter, $matches ) ) {
$creator = '@' . $matches[2];
} elseif ( preg_match( '/^@?(\w+)$/i', $twitter, $matches ) ) { // check if twitter-account matches "(@)username"
$creator = '@' . $matches[1];
}
return $creator;
}
/**
* Output Open Graph <meta> tags in the page header.
*/
function opengraph_meta_tags() {
$metadata = opengraph_metadata();
foreach ( $metadata as $key => $value ) {
if ( empty( $key ) || empty( $value ) ) {
continue;
}
$value = (array) $value;
foreach ( $value as $v ) {
// check if "strict mode" is enabled
if ( OPENGRAPH_STRICT_MODE === false ) {
// use "property" and "name"
printf(
'<meta property="%1$s" name="%1$s" content="%2$s" />' . PHP_EOL,
esc_attr( $key ),
esc_attr( $v )
);
} else {
// use "name" attribute for Twitter Cards
if ( stripos( $key, 'twitter:' ) === 0 ) {
printf(
'<meta name="%1$s" content="%2$s" />' . PHP_EOL,
esc_attr( $key ),
esc_attr( $v )
);
} else { // use "property" attribute for Open Graph
printf(
'<meta property="%1$s" content="%2$s" />' . PHP_EOL,
esc_attr( $key ),
esc_attr( $v )
);
}
}
}
}
}
add_action( 'wp_head', 'opengraph_meta_tags' );
/**
* Include profile metadata for author pages.
*
* @link http://ogp.me/#type_profile
*/
function opengraph_profile_metadata( $metadata ) {
if ( is_author() ) {
$id = get_queried_object_id();
$metadata['profile:first_name'] = get_the_author_meta( 'first_name', $id );
$metadata['profile:last_name'] = get_the_author_meta( 'last_name', $id );
$metadata['profile:username'] = get_the_author_meta( 'nicename', $id );
}
return $metadata;
}
/**
* Include article metadata for posts and pages.
*
* @link http://ogp.me/#type_article
*/
function opengraph_article_metadata( $metadata ) {
if ( ! is_singular() ) {
return $metadata;
}
$post = get_queried_object();
$author = $post->post_author;
// check if page/post has tags
$tags = wp_get_object_terms( $post->ID, 'post_tag' );
if ( $tags && is_array( $tags ) ) {
foreach ( $tags as $tag ) {
$metadata['article:tag'][] = $tag->name;
}
}
// check if page/post has categories
$categories = wp_get_object_terms( $post->ID, 'category' );
if ( $categories && is_array( $categories ) ) {
$metadata['article:section'][] = current( $categories )->name;
}
$metadata['article:published_time'] = get_the_time( 'c', $post->ID );
$metadata['article:modified_time'] = get_the_modified_time( 'c', $post->ID );
$metadata['article:author'][] = get_author_posts_url( $author );
$facebook = get_the_author_meta( 'facebook', $author );
if ( ! empty( $facebook ) ) {
$metadata['article:author'][] = $facebook;
}
return $metadata;
}
/**
* Add "twitter" as a contact method
*/
function opengraph_user_contactmethods( $user_contactmethods ) {
$user_contactmethods['twitter'] = __( 'Twitter', 'opengraph' );
$user_contactmethods['facebook'] = __( 'Facebook (Profile URL)', 'opengraph' );
return $user_contactmethods;
}
add_filter( 'user_contactmethods', 'opengraph_user_contactmethods', 1 );
/**
* Add 512x512 icon size
*
* @param array $sizes sizes available for the site icon
* @return array updated list of icons
*/
function opengraph_site_icon_image_sizes( $sizes ) {
$sizes[] = 512;
return array_unique( $sizes );
}
add_filter( 'site_icon_image_sizes', 'opengraph_site_icon_image_sizes' );
/**
* Helper function to trim text using the same default values for length and
* 'more' text as wp_trim_excerpt.
*/
function opengraph_trim_text( $text, $length = 55 ) {
$excerpt_length = apply_filters( 'excerpt_length', $length );
$excerpt_more = apply_filters( 'excerpt_more', ' [...]' );
return wp_trim_words( $text, $excerpt_length, $excerpt_more );
}