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<?php

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namespace Yoast\WP\SEO\Integrations\Front_End;

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use Yoast\WP\SEO\Conditionals\Front_End_Conditional;

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use Yoast\WP\SEO\Helpers\Options_Helper;

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use Yoast\WP\SEO\Integrations\Integration_Interface;

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/**

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* Adds actions that cleanup unwanted rss feed links.

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class Crawl_Cleanup_Rss implements Integration_Interface {

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/**

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* The options helper.

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* @var Options_Helper

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private $options_helper;

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/**

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* Crawl Cleanup RSS integration constructor.

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* @param Options_Helper $options_helper The option helper.

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public function __construct( Options_Helper $options_helper ) {

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$this->options_helper = $options_helper;

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}

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/**

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* Returns the conditionals based on which this loadable should be active.

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* @return array The conditionals.

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public static function get_conditionals() {

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return [ Front_End_Conditional::class ];

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}

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/**

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* Register our RSS related hooks.

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* @return void

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public function register_hooks() {

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if ( $this->is_true( 'remove_feed_global' ) ) {

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\add_action( 'feed_links_show_posts_feed', '__return_false' );

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}

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if ( $this->is_true( 'remove_feed_global_comments' ) ) {

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\add_action( 'feed_links_show_comments_feed', '__return_false' );

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}

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\add_action( 'wp', [ $this, 'maybe_disable_feeds' ] );

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\add_action( 'wp', [ $this, 'maybe_redirect_feeds' ], -10000 );

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}

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/**

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* Disable feeds on selected cases.

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* @return void

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public function maybe_disable_feeds() {

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if ( ( \is_singular() && $this->is_true( 'remove_feed_post_comments' ) )

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|| ( \is_author() && $this->is_true( 'remove_feed_authors' ) )

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|| ( \is_category() && $this->is_true( 'remove_feed_categories' ) )

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|| ( \is_tag() && $this->is_true( 'remove_feed_tags' ) )

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|| ( \is_tax() && $this->is_true( 'remove_feed_custom_taxonomies' ) )

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|| ( \is_post_type_archive() && $this->is_true( 'remove_feed_post_types' ) )

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|| ( \is_search() && $this->is_true( 'remove_feed_search' ) )

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) {

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\remove_action( 'wp_head', 'feed_links_extra', 3 );

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}

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}

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/**

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* Redirect feeds we don't want away.

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* @return void

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public function maybe_redirect_feeds() {

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global $wp_query;

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if ( ! \is_feed() ) {

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return;

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}

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if ( \in_array( \get_query_var( 'feed' ), [ 'atom', 'rdf' ], true ) && $this->is_true( 'remove_atom_rdf_feeds' ) ) {

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$this->redirect_feed( \home_url(), 'We disable Atom/RDF feeds for performance reasons.' );

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}

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// Only if we're on the global feed, the query is _just_ `'feed' => 'feed'`, hence this check.

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if ( ( $wp_query->query === [ 'feed' => 'feed' ]

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|| $wp_query->query === [ 'feed' => 'atom' ]

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|| $wp_query->query === [ 'feed' => 'rdf' ] )

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&& $this->is_true( 'remove_feed_global' ) ) {

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$this->redirect_feed( \home_url(), 'We disable the RSS feed for performance reasons.' );

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}

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if ( \is_comment_feed() && ! ( \is_singular() || \is_attachment() ) && $this->is_true( 'remove_feed_global_comments' ) ) {

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$this->redirect_feed( \home_url(), 'We disable comment feeds for performance reasons.' );

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}

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elseif ( \is_comment_feed()

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&& \is_singular()

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&& ( $this->is_true( 'remove_feed_post_comments' ) || $this->is_true( 'remove_feed_global_comments' ) ) ) {

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$url = \get_permalink( \get_queried_object() );

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$this->redirect_feed( $url, 'We disable post comment feeds for performance reasons.' );

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}

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if ( \is_author() && $this->is_true( 'remove_feed_authors' ) ) {

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$author_id = (int) \get_query_var( 'author' );

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$url = \get_author_posts_url( $author_id );

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$this->redirect_feed( $url, 'We disable author feeds for performance reasons.' );

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}

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if ( ( \is_category() && $this->is_true( 'remove_feed_categories' ) )

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|| ( \is_tag() && $this->is_true( 'remove_feed_tags' ) )

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|| ( \is_tax() && $this->is_true( 'remove_feed_custom_taxonomies' ) ) ) {

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$term = \get_queried_object();

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$url = \get_term_link( $term, $term->taxonomy );

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if ( \is_wp_error( $url ) ) {

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$url = \home_url();

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}

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$this->redirect_feed( $url, 'We disable taxonomy feeds for performance reasons.' );

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}

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if ( ( \is_post_type_archive() ) && $this->is_true( 'remove_feed_post_types' ) ) {

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$url = \get_post_type_archive_link( $this->get_queried_post_type() );

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$this->redirect_feed( $url, 'We disable post type feeds for performance reasons.' );

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}

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if ( \is_search() && $this->is_true( 'remove_feed_search' ) ) {

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$url = \trailingslashit( \home_url() ) . '?s=' . \get_search_query();

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$this->redirect_feed( $url, 'We disable search RSS feeds for performance reasons.' );

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}

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}

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/**

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* Sends a cache control header.

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* @param int $expiration The expiration time.

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* @return void

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public function cache_control_header( $expiration ) {

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\header_remove( 'Expires' );

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// The cacheability of the current request. 'public' allows caching, 'private' would not allow caching by proxies like CloudFlare.

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$cacheability = 'public';

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$format = '%1$s, max-age=%2$d, s-maxage=%2$d, stale-while-revalidate=120, stale-if-error=14400';

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if ( \is_user_logged_in() ) {

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$expiration = 0;

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$cacheability = 'private';

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$format = '%1$s, max-age=%2$d';

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}

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\header( \sprintf( 'Cache-Control: ' . $format, $cacheability, $expiration ), true );

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}

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/**

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* Redirect a feed result to somewhere else.

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* @param string $url The location we're redirecting to.

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* @param string $reason The reason we're redirecting.

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* @return void

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private function redirect_feed( $url, $reason ) {

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\header_remove( 'Content-Type' );

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\header_remove( 'Last-Modified' );

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$this->cache_control_header( 7 * \DAY_IN_SECONDS );

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\wp_safe_redirect( $url, 301, 'Yoast SEO: ' . $reason );

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exit;

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}

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/**

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* Retrieves the queried post type.

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* @return string The queried post type.

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private function get_queried_post_type() {

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$post_type = \get_query_var( 'post_type' );

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if ( \is_array( $post_type ) ) {

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$post_type = \reset( $post_type );

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}

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return $post_type;

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}

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/**

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* Checks if the value of an option is set to true.

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* @param string $option_name The option name.

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* @return bool

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private function is_true( $option_name ) {

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return $this->options_helper->get( $option_name ) === true;

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}

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}

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