396 lines
14 KiB
PHP
396 lines
14 KiB
PHP
<?php
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/**
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* Open Graph Tags
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*
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* Add Open Graph tags so that Facebook (and any other service that supports them)
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* can crawl the site better and we provide a better sharing experience.
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*
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* @link http://ogp.me/
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* @link http://developers.facebook.com/docs/opengraph/
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*/
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add_action( 'wp_head', 'jetpack_og_tags' );
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function jetpack_og_tags() {
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/**
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* Allow Jetpack to output Open Graph Meta Tags.
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*
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* @module sharedaddy, publicize
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*
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* @since 2.0.0
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* @deprecated 2.0.3 Duplicative filter. Use `jetpack_enable_open_graph`.
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*
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* @param bool true Should Jetpack's Open Graph Meta Tags be enabled. Default to true.
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*/
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if ( false === apply_filters( 'jetpack_enable_opengraph', true ) ) {
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_deprecated_function( 'jetpack_enable_opengraph', '2.0.3', 'jetpack_enable_open_graph' );
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return;
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}
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// Disable the widont filter on WP.com to avoid stray  s
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$disable_widont = remove_filter( 'the_title', 'widont' );
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$og_output = "\n<!-- Jetpack Open Graph Tags -->\n";
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$tags = array();
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/**
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* Filter the minimum width of the images used in Jetpack Open Graph Meta Tags.
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*
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* @module sharedaddy, publicize
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*
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* @since 2.0.0
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*
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* @param int 200 Minimum image width used in Jetpack Open Graph Meta Tags.
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*/
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$image_width = absint( apply_filters( 'jetpack_open_graph_image_width', 200 ) );
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/**
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* Filter the minimum height of the images used in Jetpack Open Graph Meta Tags.
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*
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* @module sharedaddy, publicize
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*
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* @since 2.0.0
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*
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* @param int 200 Minimum image height used in Jetpack Open Graph Meta Tags.
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*/
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$image_height = absint( apply_filters( 'jetpack_open_graph_image_height', 200 ) );
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$description_length = 197;
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if ( is_home() || is_front_page() ) {
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$site_type = get_option( 'open_graph_protocol_site_type' );
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$tags['og:type'] = ! empty( $site_type ) ? $site_type : 'website';
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$tags['og:title'] = get_bloginfo( 'name' );
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$tags['og:description'] = get_bloginfo( 'description' );
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$front_page_id = get_option( 'page_for_posts' );
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if ( 'page' == get_option( 'show_on_front' ) && $front_page_id && is_home() )
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$tags['og:url'] = get_permalink( $front_page_id );
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else
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$tags['og:url'] = home_url( '/' );
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// Associate a blog's root path with one or more Facebook accounts
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$facebook_admins = get_option( 'facebook_admins' );
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if ( ! empty( $facebook_admins ) )
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$tags['fb:admins'] = $facebook_admins;
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} else if ( is_author() ) {
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$tags['og:type'] = 'profile';
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$author = get_queried_object();
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$tags['og:title'] = $author->display_name;
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if ( ! empty( $author->user_url ) ) {
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$tags['og:url'] = $author->user_url;
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} else {
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$tags['og:url'] = get_author_posts_url( $author->ID );
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}
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$tags['og:description'] = $author->description;
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$tags['profile:first_name'] = get_the_author_meta( 'first_name', $author->ID );
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$tags['profile:last_name'] = get_the_author_meta( 'last_name', $author->ID );
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} else if ( is_singular() ) {
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global $post;
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$data = $post; // so that we don't accidentally explode the global
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$tags['og:type'] = 'article';
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if ( empty( $data->post_title ) ) {
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$tags['og:title'] = ' ';
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} else {
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/** This filter is documented in core/src/wp-includes/post-template.php */
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$tags['og:title'] = wp_kses( apply_filters( 'the_title', $data->post_title, $data->ID ), array() );
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}
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$tags['og:url'] = get_permalink( $data->ID );
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if ( ! post_password_required() ) {
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if ( ! empty( $data->post_excerpt ) ) {
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$tags['og:description'] = preg_replace( '@https?://[\S]+@', '', strip_shortcodes( wp_kses( $data->post_excerpt, array() ) ) );
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} else {
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$exploded_content_on_more_tag = explode( '<!--more-->', $data->post_content );
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$tags['og:description'] = wp_trim_words( preg_replace( '@https?://[\S]+@', '', strip_shortcodes( wp_kses( $exploded_content_on_more_tag[0], array() ) ) ) );
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}
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}
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if ( empty( $tags['og:description'] ) ) {
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/**
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* Filter the fallback `og:description` used when no excerpt information is provided.
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*
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* @module sharedaddy, publicize
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*
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* @since 3.9.0
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*
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* @param string $var Fallback og:description. Default is translated `Visit the post for more'.
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* @param object $data Post object for the current post.
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*/
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$tags['og:description'] = apply_filters( 'jetpack_open_graph_fallback_description', __( 'Visit the post for more.', 'jetpack' ), $data );
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} else {
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// Intentionally not using a filter to prevent pollution. @see https://github.com/Automattic/jetpack/pull/2899#issuecomment-151957382
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$tags['og:description'] = wp_kses( trim( convert_chars( wptexturize( $tags['og:description'] ) ) ), array() );
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}
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$tags['article:published_time'] = date( 'c', strtotime( $data->post_date_gmt ) );
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$tags['article:modified_time'] = date( 'c', strtotime( $data->post_modified_gmt ) );
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if ( post_type_supports( get_post_type( $data ), 'author' ) && isset( $data->post_author ) ) {
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$publicize_facebook_user = get_post_meta( $data->ID, '_publicize_facebook_user', true );
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if ( ! empty( $publicize_facebook_user ) ) {
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$tags['article:author'] = esc_url( $publicize_facebook_user );
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}
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}
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}
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/**
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* Allow plugins to inject additional template-specific Open Graph tags.
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*
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* @module sharedaddy, publicize
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*
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* @since 3.0.0
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*
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* @param array $tags Array of Open Graph Meta tags.
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* @param array $args Array of image size parameters.
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*/
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$tags = apply_filters( 'jetpack_open_graph_base_tags', $tags, compact( 'image_width', 'image_height' ) );
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// Re-enable widont if we had disabled it
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if ( $disable_widont )
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add_filter( 'the_title', 'widont' );
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/**
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* Do not return any Open Graph Meta tags if we don't have any info about a post.
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*
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* @module sharedaddy, publicize
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*
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* @since 3.0.0
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*
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* @param bool true Do not return any Open Graph Meta tags if we don't have any info about a post.
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*/
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if ( empty( $tags ) && apply_filters( 'jetpack_open_graph_return_if_empty', true ) )
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return;
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$tags['og:site_name'] = get_bloginfo( 'name' );
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// Get image info and build tags
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if ( ! post_password_required() ) {
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$image_info = jetpack_og_get_image( $image_width, $image_height );
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$tags['og:image'] = $image_info['src'];
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if ( ! empty( $image_info['width'] ) ) {
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$tags['og:image:width'] = $image_info['width'];
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}
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if ( ! empty( $image_info['height'] ) ) {
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$tags['og:image:height'] = $image_info['height'];
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}
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}
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// Facebook whines if you give it an empty title
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if ( empty( $tags['og:title'] ) )
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$tags['og:title'] = __( '(no title)', 'jetpack' );
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// Shorten the description if it's too long
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if ( isset( $tags['og:description'] ) ) {
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$tags['og:description'] = strlen( $tags['og:description'] ) > $description_length ? mb_substr( $tags['og:description'], 0, $description_length ) . '…' : $tags['og:description'];
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}
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// Try to add OG locale tag if the WP->FB data mapping exists
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if ( defined( 'JETPACK__GLOTPRESS_LOCALES_PATH' ) && file_exists( JETPACK__GLOTPRESS_LOCALES_PATH ) ) {
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require_once JETPACK__GLOTPRESS_LOCALES_PATH;
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$_locale = get_locale();
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// We have to account for w.org vs WP.com locale divergence
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if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
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$gp_locale = GP_Locales::by_field( 'slug', $_locale );
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} else {
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$gp_locale = GP_Locales::by_field( 'wp_locale', $_locale );
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}
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}
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if ( isset( $gp_locale->facebook_locale ) && ! empty( $gp_locale->facebook_locale ) ) {
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$tags['og:locale'] = $gp_locale->facebook_locale;
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}
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/**
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* Allow the addition of additional Open Graph Meta tags, or modify the existing tags.
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*
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* @module sharedaddy, publicize
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*
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* @since 2.0.0
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*
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* @param array $tags Array of Open Graph Meta tags.
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* @param array $args Array of image size parameters.
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*/
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$tags = apply_filters( 'jetpack_open_graph_tags', $tags, compact( 'image_width', 'image_height' ) );
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// secure_urls need to go right after each og:image to work properly so we will abstract them here
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$secure = $tags['og:image:secure_url'] = ( empty( $tags['og:image:secure_url'] ) ) ? '' : $tags['og:image:secure_url'];
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unset( $tags['og:image:secure_url'] );
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$secure_image_num = 0;
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foreach ( (array) $tags as $tag_property => $tag_content ) {
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// to accommodate multiple images
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$tag_content = (array) $tag_content;
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$tag_content = array_unique( $tag_content );
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foreach ( $tag_content as $tag_content_single ) {
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if ( empty( $tag_content_single ) )
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continue; // Don't ever output empty tags
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$og_tag = sprintf( '<meta property="%s" content="%s" />', esc_attr( $tag_property ), esc_attr( $tag_content_single ) );
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/**
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* Filter the HTML Output of each Open Graph Meta tag.
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*
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* @module sharedaddy, publicize
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*
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* @since 2.0.0
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*
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* @param string $og_tag HTML HTML Output of each Open Graph Meta tag.
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*/
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$og_output .= apply_filters( 'jetpack_open_graph_output', $og_tag );
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$og_output .= "\n";
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if ( 'og:image' == $tag_property ) {
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if ( is_array( $secure ) && !empty( $secure[$secure_image_num] ) ) {
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$og_tag = sprintf( '<meta property="og:image:secure_url" content="%s" />', esc_url( $secure[ $secure_image_num ] ) );
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/** This filter is documented in functions.opengraph.php */
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$og_output .= apply_filters( 'jetpack_open_graph_output', $og_tag );
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$og_output .= "\n";
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} else if ( !is_array( $secure ) && !empty( $secure ) ) {
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$og_tag = sprintf( '<meta property="og:image:secure_url" content="%s" />', esc_url( $secure ) );
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/** This filter is documented in functions.opengraph.php */
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$og_output .= apply_filters( 'jetpack_open_graph_output', $og_tag );
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$og_output .= "\n";
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}
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$secure_image_num++;
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}
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}
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}
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echo $og_output;
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}
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function jetpack_og_get_image( $width = 200, $height = 200, $max_images = 4 ) { // Facebook requires thumbnails to be a minimum of 200x200
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$image = '';
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if ( is_singular() && ! is_home() ) {
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global $post;
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$image = '';
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// Grab obvious image if $post is an attachment page for an image
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if ( is_attachment( $post->ID ) && 'image' == substr( $post->post_mime_type, 0, 5 ) ) {
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$image = wp_get_attachment_url( $post->ID );
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}
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// Attempt to find something good for this post using our generalized PostImages code
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if ( ! $image && class_exists( 'Jetpack_PostImages' ) ) {
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$post_images = Jetpack_PostImages::get_images( $post->ID, array( 'width' => $width, 'height' => $height ) );
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if ( $post_images && ! is_wp_error( $post_images ) ) {
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$image = array();
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foreach ( (array) $post_images as $post_image ) {
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$image['src'] = $post_image['src'];
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if ( isset( $post_image['src_width'], $post_image['src_height'] ) ) {
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$image['width'] = $post_image['src_width'];
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$image['height'] = $post_image['src_height'];
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}
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}
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}
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}
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} else if ( is_author() ) {
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$author = get_queried_object();
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if ( function_exists( 'get_avatar_url' ) ) {
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// Prefer the core function get_avatar_url() if available, WP 4.2+
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$image['src'] = get_avatar_url( $author->user_email, array( 'size' => $width ) );
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}
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else {
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$has_filter = has_filter( 'pre_option_show_avatars', '__return_true' );
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if ( ! $has_filter ) {
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add_filter( 'pre_option_show_avatars', '__return_true' );
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}
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$avatar = get_avatar( $author->user_email, $width );
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if ( ! $has_filter ) {
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remove_filter( 'pre_option_show_avatars', '__return_true' );
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}
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if ( ! empty( $avatar ) && ! is_wp_error( $avatar ) ) {
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if ( preg_match( '/src=["\']([^"\']+)["\']/', $avatar, $matches ) );
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$image['src'] = wp_specialchars_decode( $matches[1], ENT_QUOTES );
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}
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}
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}
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if ( empty( $image ) ) {
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$image = array();
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} else if ( ! is_array( $image ) ) {
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$image = array(
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'src' => $image
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);
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}
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// First fall back, blavatar
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if ( empty( $image ) && function_exists( 'blavatar_domain' ) ) {
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$blavatar_domain = blavatar_domain( site_url() );
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if ( blavatar_exists( $blavatar_domain ) ) {
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$image['src'] = blavatar_url( $blavatar_domain, 'img', $width, false, true );
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$image['width'] = $width;
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$image['height'] = $height;
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}
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}
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// Second fall back, Site Logo
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if ( empty( $image ) && ( function_exists( 'jetpack_has_site_logo' ) && jetpack_has_site_logo() ) ) {
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$image['src'] = jetpack_get_site_logo( 'url' );
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$image_dimensions = jetpack_get_site_logo_dimensions();
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if ( ! empty( $image_dimensions ) ) {
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$image['width'] = $image_dimensions['width'];
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$image['height'] = $image_dimensions['height'];
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}
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}
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// Third fall back, Core Site Icon. Added in WP 4.3.
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if ( empty( $image ) && ( function_exists( 'has_site_icon') && has_site_icon() ) ) {
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$image['src'] = get_site_icon_url( 512 );
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$image['width'] = '512';
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$image['height'] = '512';
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}
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// Finally fall back, blank image
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if ( empty( $image ) ) {
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/**
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* Filter the default Open Graph Image tag, used when no Image can be found in a post.
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*
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* @since 3.0.0
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*
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* @param string $str Default Image URL.
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*/
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$image['src'] = apply_filters( 'jetpack_open_graph_image_default', 'https://s0.wp.com/i/blank.jpg' );
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}
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return $image;
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}
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/**
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* @param $email
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* @param $width
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* @return array|bool|mixed|string
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*/
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function jetpack_og_get_image_gravatar( $email, $width ) {
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$image = '';
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if ( function_exists( 'get_avatar_url' ) ) {
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$avatar = get_avatar_url( $email, $width );
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if ( ! empty( $avatar ) ) {
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if ( is_array( $avatar ) )
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$image = $avatar[0];
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else
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$image = $avatar;
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}
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} else {
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$has_filter = has_filter( 'pre_option_show_avatars', '__return_true' );
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if ( !$has_filter ) {
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add_filter( 'pre_option_show_avatars', '__return_true' );
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}
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$avatar = get_avatar( $email, $width );
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if ( !$has_filter ) {
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remove_filter( 'pre_option_show_avatars', '__return_true' );
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}
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if ( !empty( $avatar ) && !is_wp_error( $avatar ) ) {
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if ( preg_match( '/src=["\']([^"\']+)["\']/', $avatar, $matches ) )
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$image = wp_specialchars_decode($matches[1], ENT_QUOTES);
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}
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}
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return $image;
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}
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