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<?php

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namespace Yoast\WP\SEO\Actions\Indexables;

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use Yoast\WP\SEO\Surfaces\Meta_Surface;

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use Yoast\WP\SEO\Surfaces\Values\Meta;

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/**

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* Get head action for indexables.

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class Indexable_Head_Action {

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/**

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* Caches the output.

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* @var mixed

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protected $cache;

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/**

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* The meta surface.

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* @var Meta_Surface

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private $meta_surface;

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/**

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* Indexable_Head_Action constructor.

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* @param Meta_Surface $meta_surface The meta surface.

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public function __construct( Meta_Surface $meta_surface ) {

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$this->meta_surface = $meta_surface;

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}

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/**

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* Retrieves the head for a url.

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* @param string $url The url to get the head for.

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* @return object Object with head and status properties.

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public function for_url( $url ) {

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if ( $url === \trailingslashit( \get_home_url() ) ) {

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return $this->with_404_fallback( $this->with_cache( 'home_page' ) );

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}

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return $this->with_404_fallback( $this->with_cache( 'url', $url ) );

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}

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/**

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* Retrieves the head for a post.

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* @param int $id The id.

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* @return object Object with head and status properties.

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public function for_post( $id ) {

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return $this->with_404_fallback( $this->with_cache( 'post', $id ) );

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}

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/**

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* Retrieves the head for a term.

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* @param int $id The id.

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* @return object Object with head and status properties.

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public function for_term( $id ) {

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return $this->with_404_fallback( $this->with_cache( 'term', $id ) );

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}

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/**

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* Retrieves the head for an author.

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* @param int $id The id.

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* @return object Object with head and status properties.

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public function for_author( $id ) {

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return $this->with_404_fallback( $this->with_cache( 'author', $id ) );

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}

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/**

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* Retrieves the head for a post type archive.

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* @param int $type The id.

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* @return object Object with head and status properties.

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public function for_post_type_archive( $type ) {

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return $this->with_404_fallback( $this->with_cache( 'post_type_archive', $type ) );

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}

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/**

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* Retrieves the head for the posts page.

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* @return object Object with head and status properties.

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public function for_posts_page() {

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return $this->with_404_fallback( $this->with_cache( 'posts_page' ) );

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}

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/**

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* Retrieves the head for the 404 page. Always sets the status to 404.

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* @return object Object with head and status properties.

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public function for_404() {

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$meta = $this->with_cache( '404' );

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if ( ! $meta ) {

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return (object) [

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'html' => '',

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'json' => [],

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'status' => 404,

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];

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}

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$head = $meta->get_head();

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return (object) [

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'html' => $head->html,

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'json' => $head->json,

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'status' => 404,

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];

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}

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/**

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* Retrieves the head for a successful page load.

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* @param object $head The calculated Yoast head.

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* @return object The presentations and status code 200.

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protected function for_200( $head ) {

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return (object) [

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'html' => $head->html,

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'json' => $head->json,

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'status' => 200,

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];

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}

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/**

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* Returns the head with 404 fallback

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* @param Meta|false $meta The meta object.

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* @return object The head response.

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protected function with_404_fallback( $meta ) {

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if ( $meta === false ) {

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return $this->for_404();

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}

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else {

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return $this->for_200( $meta->get_head() );

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}

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}

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/**

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* Retrieves a value from the meta surface cached.

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* @param string $type The type of value to retrieve.

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* @param string $argument Optional. The argument for the value.

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* @return Meta The meta object.

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protected function with_cache( $type, $argument = '' ) {

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if ( ! isset( $this->cache[ $type ][ $argument ] ) ) {

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$this->cache[ $type ][ $argument ] = \call_user_func( [ $this->meta_surface, "for_$type" ], $argument );

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}

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return $this->cache[ $type ][ $argument ];

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}

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}

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