<?php

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/**

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* Main class file for the SEO Tools module.

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*

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* @package automattic/jetpack

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*/

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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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* @phan-constructor-used-for-side-effects

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*/

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class Jetpack_SEO {

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/**

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* Constructor.

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*/

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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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/**

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* Initialization method for Jetpack_SEO.

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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 from 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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Jetpack_SEO_Posts::register_post_meta();

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// Exclude posts with 'jetpack_seo_noindex' set true from the Jetpack sitemap.

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add_filter( 'jetpack_sitemap_skip_post', array( 'Jetpack_SEO_Posts', 'exclude_noindex_posts_from_jetpack_sitemap' ), 10, 2 );

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add_action( 'rest_api_init', array( $this, 'add_custom_field_post_type_meta' ) );

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}

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/**

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* Add custom field meta to all public post types that don't already have it.

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*/

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public function add_custom_field_post_type_meta() {

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/**

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* Filter the list of post types for which custom fields support is added.

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*

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* This filter allows modification of the post types that will be processed

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* to add support for custom fields if they do not already support it.

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*

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* @since 14.2

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*

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* @param array $post_types An array of post type names.

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*/

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$post_types = apply_filters(

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'jetpack_seo_custom_field_post_types',

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get_post_types(

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array(

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'public' => true,

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'show_ui' => true,

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'_builtin' => false,

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)

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)

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);

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foreach ( $post_types as $post_type ) {

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if ( ! post_type_supports( $post_type, 'custom-fields' ) ) {

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add_post_type_support( $post_type, 'custom-fields' );

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}

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}

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}

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/**

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* Helper method to fetch authors.

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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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if ( ! $post instanceof WP_Post ) {

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continue;

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}

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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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/**

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* Constructs open graph tag data.

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*

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* @param array $tags Array of tag data.

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* @return array of tag data.

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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 ( class_exists( 'woocommerce' ) && is_shop() ) {

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$shop_page_id = get_option( 'woocommerce_shop_page_id' );

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if ( $shop_page_id ) {

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$post_custom_description = Jetpack_SEO_Posts::get_post_custom_description( get_post( $shop_page_id ) );

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}

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}

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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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} elseif ( ! empty( $post_custom_description ) ) {

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$tags['og:description'] = $post_custom_description;

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}

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return $tags;

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}

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/**

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* Outputs Jetpack's SEO <meta> tags.

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*/

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public function meta_tags() {

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global $wp_query;

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$post_count = is_countable( $wp_query->posts ) ? count( $wp_query->posts ) : 0;

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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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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(

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strip_shortcodes(

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wp_strip_all_tags( $description, true )

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)

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);

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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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/* translators: first property is an user's display name, the second is the site's title. */

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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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isset( $obj->display_name ) ? $obj->display_name : __( 'the author', 'jetpack' ),

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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 = '';

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if ( isset( $obj->term_id ) && isset( $obj->taxonomy ) ) {

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$description = get_term_field( 'description', $obj->term_id, $obj->taxonomy, 'raw' );

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}

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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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/* translators: %1$s: A post category. %2$l: Post authors. */

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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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/* translators: %1$s: Number of posts published. %2$l: Post author. %3$s: A year date. */

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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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$post_count, // 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 = gmdate( 'F Y', mktime( 0, 0, 0, get_query_var( 'monthnum' ), 1, get_query_var( 'year' ) ) );

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/* translators: %1$s: Number of posts published. %2$l: Post author. %3$s: A month/year date. */

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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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$post_count, // 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 = gmdate(

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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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/* translators: %1$s: Number of posts published. %2$l: Post author. %3$s: A month/day/year date. */

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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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$post_count, // 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, $post_count, $authors, $period );

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}

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$mark_as_noindex = Jetpack_SEO_Posts::get_post_noindex_setting( get_post() );

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if ( $mark_as_noindex ) {

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$meta['robots'] = 'noindex';

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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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