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<?php

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namespace Yoast\WP\SEO\Integrations\Watchers;

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use WPSEO_Meta;

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use Yoast\WP\SEO\Conditionals\Migrations_Conditional;

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use Yoast\WP\SEO\Integrations\Integration_Interface;

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/**

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* WordPress post meta watcher.

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class Indexable_Post_Meta_Watcher implements Integration_Interface {

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/**

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* The post watcher.

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* @var Indexable_Post_Watcher

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protected $post_watcher;

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/**

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* An array of post IDs that need to be updated.

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* @var array<int>

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protected $post_ids_to_update = [];

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/**

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

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* @return string[]

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public static function get_conditionals() {

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return [ Migrations_Conditional::class ];

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}

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/**

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* Indexable_Postmeta_Watcher constructor.

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* @param Indexable_Post_Watcher $post_watcher The post watcher.

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public function __construct( Indexable_Post_Watcher $post_watcher ) {

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$this->post_watcher = $post_watcher;

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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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// Register all posts whose meta have changed.

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\add_action( 'added_post_meta', [ $this, 'add_post_id' ], 10, 3 );

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\add_action( 'updated_post_meta', [ $this, 'add_post_id' ], 10, 3 );

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\add_action( 'deleted_post_meta', [ $this, 'add_post_id' ], 10, 3 );

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// Remove posts that get saved as they are handled by the Indexable_Post_Watcher.

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\add_action( 'wp_insert_post', [ $this, 'remove_post_id' ] );

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\add_action( 'delete_post', [ $this, 'remove_post_id' ] );

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\add_action( 'edit_attachment', [ $this, 'remove_post_id' ] );

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\add_action( 'add_attachment', [ $this, 'remove_post_id' ] );

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\add_action( 'delete_attachment', [ $this, 'remove_post_id' ] );

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// Update indexables of all registered posts.

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\register_shutdown_function( [ $this, 'update_indexables' ] );

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}

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/**

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* Adds a post id to the array of posts to update.

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* @param int|string $meta_id The meta ID.

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* @param int|string $post_id The post ID.

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* @param string $meta_key The meta key.

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* @return void

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public function add_post_id( $meta_id, $post_id, $meta_key ) {

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// Only register changes to our own meta.

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if ( \is_string( $meta_key ) && \strpos( $meta_key, WPSEO_Meta::$meta_prefix ) !== 0 ) {

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return;

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}

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if ( ! \in_array( $post_id, $this->post_ids_to_update, true ) ) {

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$this->post_ids_to_update[] = (int) $post_id;

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}

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}

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/**

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* Removes a post id from the array of posts to update.

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* @param int|string $post_id The post ID.

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* @return void

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public function remove_post_id( $post_id ) {

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$this->post_ids_to_update = \array_diff( $this->post_ids_to_update, [ (int) $post_id ] );

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}

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/**

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* Updates all indexables changed during the request.

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* @return void

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public function update_indexables() {

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foreach ( $this->post_ids_to_update as $post_id ) {

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$this->post_watcher->build_indexable( $post_id );

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}

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}

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}

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