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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\Integrations\Integration_Interface;

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use Yoast\WP\SEO\Wrappers\WP_Query_Wrapper;

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/**

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* Handles intercepting requests.

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class Handle_404 implements Integration_Interface {

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/**

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* The WP Query wrapper.

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* @var WP_Query_Wrapper

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private $query_wrapper;

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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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* Initializes the integration.

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* This is the place to register hooks and filters.

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* @return void

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public function register_hooks() {

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\add_filter( 'pre_handle_404', [ $this, 'handle_404' ] );

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}

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/**

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* Handle_404 constructor.

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* @codeCoverageIgnore Handles dependencies.

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* @param WP_Query_Wrapper $query_wrapper The query wrapper.

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public function __construct( WP_Query_Wrapper $query_wrapper ) {

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$this->query_wrapper = $query_wrapper;

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}

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/**

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* Handles the 404 status code.

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* @param bool $handled Whether we've handled the request.

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* @return bool True if it's 404.

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public function handle_404( $handled ) {

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if ( ! $this->is_feed_404() ) {

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return $handled;

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}

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$this->set_404();

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$this->set_headers();

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\add_filter( 'old_slug_redirect_url', '__return_false' );

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\add_filter( 'redirect_canonical', '__return_false' );

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return true;

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}

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/**

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* If there are no posts in a feed, make it 404 instead of sending an empty RSS feed.

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* @return bool True if it's 404.

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protected function is_feed_404() {

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if ( ! \is_feed() ) {

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return false;

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}

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$wp_query = $this->query_wrapper->get_query();

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// Don't 404 if the query contains post(s) or an object.

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if ( $wp_query->posts || $wp_query->get_queried_object() ) {

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return false;

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}

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// Don't 404 if it isn't archive or singular.

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if ( ! $wp_query->is_archive() && ! $wp_query->is_singular() ) {

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return false;

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}

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return true;

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}

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/**

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* Sets the 404 status code.

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* @return void

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protected function set_404() {

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$wp_query = $this->query_wrapper->get_query();

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$wp_query->is_feed = false;

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$wp_query->set_404();

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$this->query_wrapper->set_query( $wp_query );

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}

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/**

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* Sets the headers for http.

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* @codeCoverageIgnore

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* @return void

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protected function set_headers() {

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// Overwrite Content-Type header.

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if ( ! \headers_sent() ) {

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\header( 'Content-Type: ' . \get_option( 'html_type' ) . '; charset=' . \get_option( 'blog_charset' ) );

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}

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\status_header( 404 );

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\nocache_headers();

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}

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}

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