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206
wp-content/plugins/jetpack/modules/seo-tools/jetpack-seo.php
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206
wp-content/plugins/jetpack/modules/seo-tools/jetpack-seo.php
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<?php
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/**
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* An SEO expert walks into a bar, bars, pub, public house, Irish pub, drinks, beer, wine, liquor, Grey Goose, Cristal...
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*/
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class Jetpack_SEO {
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public function __construct() {
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add_action( 'init', array( $this, 'init' ) );
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}
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public function init() {
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/**
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* Can be used to prevent SEO tools from inserting custom meta tags.
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*
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* @module seo-tools
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*
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* @since 4.4.0
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*
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* @param bool true Should Jetpack's SEO Meta Tags be enabled. Defaults to true.
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*/
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if ( apply_filters( 'jetpack_seo_meta_tags_enabled', true ) ) {
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add_action( 'wp_head', array( $this, 'meta_tags' ) );
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// Add support for editing page excerpts in pages, regardless of theme support.
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add_post_type_support( 'page', 'excerpt' );
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}
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/**
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* Can be used to prevent SEO tools form modifying site titles.
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*
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* @module seo-tools
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*
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* @since 4.4.0
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*
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* @param bool true Should Jetpack SEO modify site titles. Defaults to true.
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*/
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if ( apply_filters( 'jetpack_seo_custom_titles', true ) ) {
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// Overwrite page title with custom SEO meta title for themes that support title-tag.
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add_filter( 'pre_get_document_title', array( 'Jetpack_SEO_Titles', 'get_custom_title' ) );
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// Add overwrite support for themes that don't support title-tag.
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add_filter( 'wp_title', array( 'Jetpack_SEO_Titles', 'get_custom_title' ) );
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}
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add_filter( 'jetpack_open_graph_tags', array( $this, 'set_custom_og_tags' ) );
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}
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private function get_authors() {
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global $wp_query;
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$authors = array();
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foreach ( $wp_query->posts as $post ) {
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$authors[] = get_the_author_meta( 'display_name', (int) $post->post_author );
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}
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$authors = array_unique( $authors );
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return $authors;
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}
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public function set_custom_og_tags( $tags ) {
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$custom_title = Jetpack_SEO_Titles::get_custom_title();
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if ( ! empty( $custom_title ) ) {
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$tags['og:title'] = $custom_title;
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}
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$post_custom_description = Jetpack_SEO_Posts::get_post_custom_description( get_post() );
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$front_page_meta = Jetpack_SEO_Utils::get_front_page_meta_description();
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if ( is_front_page() && ! empty( $front_page_meta ) ) {
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$tags['og:description'] = $front_page_meta;
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} else {
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if ( ! empty( $post_custom_description ) ) {
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$tags['og:description'] = $post_custom_description;
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}
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}
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return $tags;
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}
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public function meta_tags() {
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global $wp_query;
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$period = '';
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$template = '';
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$meta = array();
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/**
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* Can be used to specify a list of themes that set their own meta tags.
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*
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* If current site is using one of the themes listed as conflicting, inserting Jetpack SEO
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* meta tags will be prevented.
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*
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* @module seo-tools
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*
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* @since 4.4.0
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*
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* @param array List of conflicted theme names. Defaults to empty array.
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*/
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$conflicted_themes = apply_filters( 'jetpack_seo_meta_tags_conflicted_themes', array() );
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if ( isset( $conflicted_themes[ get_option( 'template' ) ] ) ) {
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return;
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}
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$front_page_meta = Jetpack_SEO_Utils::get_front_page_meta_description();
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$description = $front_page_meta ? $front_page_meta : get_bloginfo( 'description' );
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$meta['description'] = trim( $description );
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// Try to target things if we're on a "specific" page of any kind.
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if ( is_singular() ) {
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// Business users can overwrite the description.
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if ( ! ( is_front_page() && Jetpack_SEO_Utils::get_front_page_meta_description() ) ) {
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$description = Jetpack_SEO_Posts::get_post_description( get_post() );
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if ( $description ) {
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$description = wp_trim_words( strip_shortcodes( wp_kses( $description, array() ) ) );
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$meta['description'] = $description;
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}
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}
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} elseif ( is_author() ) {
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$obj = get_queried_object();
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$meta['description'] = sprintf(
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_x( 'Read all of the posts by %1$s on %2$s', 'Read all of the posts by Author Name on Blog Title', 'jetpack' ),
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$obj->display_name,
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get_bloginfo( 'title' )
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);
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} elseif ( is_tag() || is_category() || is_tax() ) {
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$obj = get_queried_object();
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$description = get_term_field( 'description', $obj->term_id, $obj->taxonomy, 'raw' );
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if ( ! is_wp_error( $description ) && '' != $description ) {
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$meta['description'] = wp_trim_words( $description );
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} else {
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$authors = $this->get_authors();
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$meta['description'] = wp_sprintf(
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_x( 'Posts about %1$s written by %2$l', 'Posts about Category written by John and Bob', 'jetpack' ),
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single_term_title( '', false ),
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$authors
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);
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}
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} elseif ( is_date() ) {
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if ( is_year() ) {
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$period = get_query_var( 'year' );
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$template = _nx(
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'%1$s post published by %2$l in the year %3$s', // singular
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'%1$s posts published by %2$l in the year %3$s', // plural
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count( $wp_query->posts ), // number
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'10 posts published by John in the year 2012', // context
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'jetpack'
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);
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} elseif ( is_month() ) {
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$period = date( 'F Y', mktime( 0, 0, 0, get_query_var( 'monthnum' ), 1, get_query_var( 'year' ) ) );
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$template = _nx(
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'%1$s post published by %2$l during %3$s', // singular
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'%1$s posts published by %2$l during %3$s', // plural
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count( $wp_query->posts ), // number
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'10 posts publishes by John during May 2012', // context
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'jetpack'
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);
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} elseif ( is_day() ) {
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$period = date(
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'F j, Y',
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mktime( 0, 0, 0, get_query_var( 'monthnum' ), get_query_var( 'day' ), get_query_var( 'year' ) )
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);
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$template = _nx(
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'%1$s post published by %2$l on %3$s', // singular
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'%1$s posts published by %2$l on %3$s', // plural
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count( $wp_query->posts ), // number
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'10 posts published by John on May 30, 2012', // context
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'jetpack'
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);
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}
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$authors = $this->get_authors();
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$meta['description'] = wp_sprintf( $template, count( $wp_query->posts ), $authors, $period );
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}
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/**
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* Can be used to edit the default SEO tools meta tags.
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*
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* @module seo-tools
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*
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* @since 4.4.0
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*
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* @param array Array that consists of meta name and meta content pairs.
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*/
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$meta = apply_filters( 'jetpack_seo_meta_tags', $meta );
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// Output them
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foreach ( $meta as $name => $content ) {
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if ( ! empty( $content ) ) {
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echo '<meta name="' . esc_attr( $name ) . '" content="' . esc_attr( $content ) . '" />' . "\n";
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}
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}
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}
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}
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