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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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use Yoast\WP\SEO\Surfaces\Meta_Surface;

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/**

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* Class Feed_Improvements

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class Feed_Improvements implements Integration_Interface {

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/**

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* Holds the options helper.

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* @var Options_Helper

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private $options;

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/**

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* Holds the meta helper surface.

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* @var Meta_Surface

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private $meta;

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/**

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* Canonical_Header constructor.

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* @codeCoverageIgnore It only sets depedencies.

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* @param Options_Helper $options The options helper.

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* @param Meta_Surface $meta The meta surface.

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public function __construct(

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Options_Helper $options,

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Meta_Surface $meta

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) {

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$this->options = $options;

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$this->meta = $meta;

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}

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/**

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

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* @return array

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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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* Registers hooks to WordPress.

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* @return void

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public function register_hooks() {

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\add_filter( 'get_bloginfo_rss', [ $this, 'filter_bloginfo_rss' ], 10, 2 );

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\add_filter( 'document_title_separator', [ $this, 'filter_document_title_separator' ] );

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\add_action( 'do_feed_rss', [ $this, 'handle_rss_feed' ], 9 );

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\add_action( 'do_feed_rss2', [ $this, 'send_canonical_header' ], 9 );

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\add_action( 'do_feed_rss2', [ $this, 'add_robots_headers' ], 9 );

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}

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/**

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* Filter `bloginfo_rss` output to give the URL for what's being shown instead of just always the homepage.

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* @param string $show The output so far.

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* @param string $what What is being shown.

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* @return string

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public function filter_bloginfo_rss( $show, $what ) {

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if ( $what === 'url' ) {

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return $this->get_url_for_queried_object( $show );

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}

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return $show;

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}

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/**

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* Makes sure send canonical header always runs, because this RSS hook does not support the for_comments parameter

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* @return void

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public function handle_rss_feed() {

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$this->send_canonical_header( false );

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}

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/**

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* Adds a canonical link header to the main canonical URL for the requested feed object. If it is not a comment

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* feed.

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* @param bool $for_comments If the RRS feed is meant for a comment feed.

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* @return void

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public function send_canonical_header( $for_comments ) {

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if ( $for_comments || \headers_sent() ) {

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return;

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}

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$queried_object = \get_queried_object();

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// Don't call get_class with null. This gives a warning.

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$class = ( $queried_object !== null ) ? \get_class( $queried_object ) : null;

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$url = $this->get_url_for_queried_object( $this->meta->for_home_page()->canonical );

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if ( ( ! empty( $url ) && $url !== $this->meta->for_home_page()->canonical ) || $class === null ) {

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\header( \sprintf( 'Link: <%s>; rel="canonical"', $url ), false );

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}

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}

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/**

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* Adds noindex, follow tag for comment feeds.

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* @param bool $for_comments If the RSS feed is meant for a comment feed.

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* @return void

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public function add_robots_headers( $for_comments ) {

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if ( $for_comments && ! \headers_sent() ) {

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\header( 'X-Robots-Tag: noindex, follow', true );

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}

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}

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/**

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* Makes sure the title separator set in Yoast SEO is used for all feeds.

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* @param string $separator The separator from WordPress.

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* @return string The separator from Yoast SEO's settings.

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public function filter_document_title_separator( $separator ) {

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return \html_entity_decode( $this->options->get_title_separator() );

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}

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/**

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* Determines the main URL for the queried object.

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* @param string $url The URL determined so far.

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* @return string The canonical URL for the queried object.

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protected function get_url_for_queried_object( $url = '' ) {

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$queried_object = \get_queried_object();

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// Don't call get_class with null. This gives a warning.

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$class = ( $queried_object !== null ) ? \get_class( $queried_object ) : null;

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$meta = false;

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switch ( $class ) {

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// Post type archive feeds.

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case 'WP_Post_Type':

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$meta = $this->meta->for_post_type_archive( $queried_object->name );

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break;

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// Post comment feeds.

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case 'WP_Post':

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$meta = $this->meta->for_post( $queried_object->ID );

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break;

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// Term feeds.

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case 'WP_Term':

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$meta = $this->meta->for_term( $queried_object->term_id );

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break;

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// Author feeds.

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case 'WP_User':

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$meta = $this->meta->for_author( $queried_object->ID );

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break;

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// This would be NULL on the home page and on date archive feeds.

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case null:

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$meta = $this->meta->for_home_page();

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break;

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default:

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break;

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}

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if ( $meta ) {

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return $meta->canonical;

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}

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return $url;

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}

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}

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