diff -r c7c34916027a -r 177826044cd9 wp/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php	Mon Oct 14 18:28:13 2019 +0200
@@ -0,0 +1,204 @@
+<?php
+/**
+ * REST API: WP_REST_Post_Search_Handler class
+ *
+ * @package WordPress
+ * @subpackage REST_API
+ * @since 5.0.0
+ */
+
+/**
+ * Core class representing a search handler for posts in the REST API.
+ *
+ * @since 5.0.0
+ */
+class WP_REST_Post_Search_Handler extends WP_REST_Search_Handler {
+
+	/**
+	 * Constructor.
+	 *
+	 * @since 5.0.0
+	 */
+	public function __construct() {
+		$this->type = 'post';
+
+		// Support all public post types except attachments.
+		$this->subtypes = array_diff(
+			array_values(
+				get_post_types(
+					array(
+						'public'       => true,
+						'show_in_rest' => true,
+					),
+					'names'
+				)
+			),
+			array( 'attachment' )
+		);
+	}
+
+	/**
+	 * Searches the object type content for a given search request.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param WP_REST_Request $request Full REST request.
+	 * @return array Associative array containing an `WP_REST_Search_Handler::RESULT_IDS` containing
+	 *               an array of found IDs and `WP_REST_Search_Handler::RESULT_TOTAL` containing the
+	 *               total count for the matching search results.
+	 */
+	public function search_items( WP_REST_Request $request ) {
+
+		// Get the post types to search for the current request.
+		$post_types = $request[ WP_REST_Search_Controller::PROP_SUBTYPE ];
+		if ( in_array( WP_REST_Search_Controller::TYPE_ANY, $post_types, true ) ) {
+			$post_types = $this->subtypes;
+		}
+
+		$query_args = array(
+			'post_type'           => $post_types,
+			'post_status'         => 'publish',
+			'paged'               => (int) $request['page'],
+			'posts_per_page'      => (int) $request['per_page'],
+			'ignore_sticky_posts' => true,
+			'fields'              => 'ids',
+		);
+
+		if ( ! empty( $request['search'] ) ) {
+			$query_args['s'] = $request['search'];
+		}
+
+		/**
+		 * Filters the query arguments for a search request.
+		 *
+		 * Enables adding extra arguments or setting defaults for a post search request.
+		 *
+		 * @since 5.1.0
+		 *
+		 * @param array           $query_args Key value array of query var to query value.
+		 * @param WP_REST_Request $request    The request used.
+		 */
+		$query_args = apply_filters( 'rest_post_search_query', $query_args, $request );
+
+		$query     = new WP_Query();
+		$found_ids = $query->query( $query_args );
+		$total     = $query->found_posts;
+
+		return array(
+			self::RESULT_IDS   => $found_ids,
+			self::RESULT_TOTAL => $total,
+		);
+	}
+
+	/**
+	 * Prepares the search result for a given ID.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param int   $id     Item ID.
+	 * @param array $fields Fields to include for the item.
+	 * @return array Associative array containing all fields for the item.
+	 */
+	public function prepare_item( $id, array $fields ) {
+		$post = get_post( $id );
+
+		$data = array();
+
+		if ( in_array( WP_REST_Search_Controller::PROP_ID, $fields, true ) ) {
+			$data[ WP_REST_Search_Controller::PROP_ID ] = (int) $post->ID;
+		}
+
+		if ( in_array( WP_REST_Search_Controller::PROP_TITLE, $fields, true ) ) {
+			if ( post_type_supports( $post->post_type, 'title' ) ) {
+				add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+				$data[ WP_REST_Search_Controller::PROP_TITLE ] = get_the_title( $post->ID );
+				remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			} else {
+				$data[ WP_REST_Search_Controller::PROP_TITLE ] = '';
+			}
+		}
+
+		if ( in_array( WP_REST_Search_Controller::PROP_URL, $fields, true ) ) {
+			$data[ WP_REST_Search_Controller::PROP_URL ] = get_permalink( $post->ID );
+		}
+
+		if ( in_array( WP_REST_Search_Controller::PROP_TYPE, $fields, true ) ) {
+			$data[ WP_REST_Search_Controller::PROP_TYPE ] = $this->type;
+		}
+
+		if ( in_array( WP_REST_Search_Controller::PROP_SUBTYPE, $fields, true ) ) {
+			$data[ WP_REST_Search_Controller::PROP_SUBTYPE ] = $post->post_type;
+		}
+
+		return $data;
+	}
+
+	/**
+	 * Prepares links for the search result of a given ID.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param int $id Item ID.
+	 * @return array Links for the given item.
+	 */
+	public function prepare_item_links( $id ) {
+		$post = get_post( $id );
+
+		$links = array();
+
+		$item_route = $this->detect_rest_item_route( $post );
+		if ( ! empty( $item_route ) ) {
+			$links['self'] = array(
+				'href'       => rest_url( $item_route ),
+				'embeddable' => true,
+			);
+		}
+
+		$links['about'] = array(
+			'href' => rest_url( 'wp/v2/types/' . $post->post_type ),
+		);
+
+		return $links;
+	}
+
+	/**
+	 * Overwrites the default protected title format.
+	 *
+	 * By default, WordPress will show password protected posts with a title of
+	 * "Protected: %s". As the REST API communicates the protected status of a post
+	 * in a machine readable format, we remove the "Protected: " prefix.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @return string Protected title format.
+	 */
+	public function protected_title_format() {
+		return '%s';
+	}
+
+	/**
+	 * Attempts to detect the route to access a single item.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param WP_Post $post Post object.
+	 * @return string REST route relative to the REST base URI, or empty string if unknown.
+	 */
+	protected function detect_rest_item_route( $post ) {
+		$post_type = get_post_type_object( $post->post_type );
+		if ( ! $post_type ) {
+			return '';
+		}
+
+		// It's currently impossible to detect the REST URL from a custom controller.
+		if ( ! empty( $post_type->rest_controller_class ) && 'WP_REST_Posts_Controller' !== $post_type->rest_controller_class ) {
+			return '';
+		}
+
+		$namespace = 'wp/v2';
+		$rest_base = ! empty( $post_type->rest_base ) ? $post_type->rest_base : $post_type->name;
+
+		return sprintf( '%s/%s/%d', $namespace, $rest_base, $post->ID );
+	}
+
+}