diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,2493 @@
+<?php
+/**
+ * REST API: WP_REST_Posts_Controller class
+ *
+ * @package WordPress
+ * @subpackage REST_API
+ * @since 4.7.0
+ */
+
+/**
+ * Core class to access posts via the REST API.
+ *
+ * @since 4.7.0
+ *
+ * @see WP_REST_Controller
+ */
+class WP_REST_Posts_Controller extends WP_REST_Controller {
+
+	/**
+	 * Post type.
+	 *
+	 * @since 4.7.0
+	 * @var string
+	 */
+	protected $post_type;
+
+	/**
+	 * Instance of a post meta fields object.
+	 *
+	 * @since 4.7.0
+	 * @var WP_REST_Post_Meta_Fields
+	 */
+	protected $meta;
+
+	/**
+	 * Constructor.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string $post_type Post type.
+	 */
+	public function __construct( $post_type ) {
+		$this->post_type = $post_type;
+		$this->namespace = 'wp/v2';
+		$obj = get_post_type_object( $post_type );
+		$this->rest_base = ! empty( $obj->rest_base ) ? $obj->rest_base : $obj->name;
+
+		$this->meta = new WP_REST_Post_Meta_Fields( $this->post_type );
+	}
+
+	/**
+	 * Registers the routes for the objects of the controller.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @see register_rest_route()
+	 */
+	public function register_routes() {
+
+		register_rest_route( $this->namespace, '/' . $this->rest_base, array(
+			array(
+				'methods'             => WP_REST_Server::READABLE,
+				'callback'            => array( $this, 'get_items' ),
+				'permission_callback' => array( $this, 'get_items_permissions_check' ),
+				'args'                => $this->get_collection_params(),
+			),
+			array(
+				'methods'             => WP_REST_Server::CREATABLE,
+				'callback'            => array( $this, 'create_item' ),
+				'permission_callback' => array( $this, 'create_item_permissions_check' ),
+				'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::CREATABLE ),
+			),
+			'schema' => array( $this, 'get_public_item_schema' ),
+		) );
+
+		$schema = $this->get_item_schema();
+		$get_item_args = array(
+			'context'  => $this->get_context_param( array( 'default' => 'view' ) ),
+		);
+		if ( isset( $schema['properties']['password'] ) ) {
+			$get_item_args['password'] = array(
+				'description' => __( 'The password for the post if it is password protected.' ),
+				'type'        => 'string',
+			);
+		}
+		register_rest_route( $this->namespace, '/' . $this->rest_base . '/(?P<id>[\d]+)', array(
+			'args' => array(
+				'id' => array(
+					'description' => __( 'Unique identifier for the object.' ),
+					'type'        => 'integer',
+				),
+			),
+			array(
+				'methods'             => WP_REST_Server::READABLE,
+				'callback'            => array( $this, 'get_item' ),
+				'permission_callback' => array( $this, 'get_item_permissions_check' ),
+				'args'                => $get_item_args,
+			),
+			array(
+				'methods'             => WP_REST_Server::EDITABLE,
+				'callback'            => array( $this, 'update_item' ),
+				'permission_callback' => array( $this, 'update_item_permissions_check' ),
+				'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
+			),
+			array(
+				'methods'             => WP_REST_Server::DELETABLE,
+				'callback'            => array( $this, 'delete_item' ),
+				'permission_callback' => array( $this, 'delete_item_permissions_check' ),
+				'args'                => array(
+					'force' => array(
+						'type'        => 'boolean',
+						'default'     => false,
+						'description' => __( 'Whether to bypass trash and force deletion.' ),
+					),
+				),
+			),
+			'schema' => array( $this, 'get_public_item_schema' ),
+		) );
+	}
+
+	/**
+	 * Checks if a given request has access to read posts.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param  WP_REST_Request $request Full details about the request.
+	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
+	 */
+	public function get_items_permissions_check( $request ) {
+
+		$post_type = get_post_type_object( $this->post_type );
+
+		if ( 'edit' === $request['context'] && ! current_user_can( $post_type->cap->edit_posts ) ) {
+			return new WP_Error( 'rest_forbidden_context', __( 'Sorry, you are not allowed to edit posts in this post type.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		return true;
+	}
+
+	/**
+	 * Retrieves a collection of posts.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+	 */
+	public function get_items( $request ) {
+
+		// Ensure a search string is set in case the orderby is set to 'relevance'.
+		if ( ! empty( $request['orderby'] ) && 'relevance' === $request['orderby'] && empty( $request['search'] ) ) {
+			return new WP_Error( 'rest_no_search_term_defined', __( 'You need to define a search term to order by relevance.' ), array( 'status' => 400 ) );
+		}
+
+		// Ensure an include parameter is set in case the orderby is set to 'include'.
+		if ( ! empty( $request['orderby'] ) && 'include' === $request['orderby'] && empty( $request['include'] ) ) {
+			return new WP_Error( 'rest_orderby_include_missing_include', __( 'You need to define an include parameter to order by include.' ), array( 'status' => 400 ) );
+		}
+
+		// Retrieve the list of registered collection query parameters.
+		$registered = $this->get_collection_params();
+		$args = array();
+
+		/*
+		 * This array defines mappings between public API query parameters whose
+		 * values are accepted as-passed, and their internal WP_Query parameter
+		 * name equivalents (some are the same). Only values which are also
+		 * present in $registered will be set.
+		 */
+		$parameter_mappings = array(
+			'author'         => 'author__in',
+			'author_exclude' => 'author__not_in',
+			'exclude'        => 'post__not_in',
+			'include'        => 'post__in',
+			'menu_order'     => 'menu_order',
+			'offset'         => 'offset',
+			'order'          => 'order',
+			'orderby'        => 'orderby',
+			'page'           => 'paged',
+			'parent'         => 'post_parent__in',
+			'parent_exclude' => 'post_parent__not_in',
+			'search'         => 's',
+			'slug'           => 'post_name__in',
+			'status'         => 'post_status',
+		);
+
+		/*
+		 * For each known parameter which is both registered and present in the request,
+		 * set the parameter's value on the query $args.
+		 */
+		foreach ( $parameter_mappings as $api_param => $wp_param ) {
+			if ( isset( $registered[ $api_param ], $request[ $api_param ] ) ) {
+				$args[ $wp_param ] = $request[ $api_param ];
+			}
+		}
+
+		// Check for & assign any parameters which require special handling or setting.
+		$args['date_query'] = array();
+
+		// Set before into date query. Date query must be specified as an array of an array.
+		if ( isset( $registered['before'], $request['before'] ) ) {
+			$args['date_query'][0]['before'] = $request['before'];
+		}
+
+		// Set after into date query. Date query must be specified as an array of an array.
+		if ( isset( $registered['after'], $request['after'] ) ) {
+			$args['date_query'][0]['after'] = $request['after'];
+		}
+
+		// Ensure our per_page parameter overrides any provided posts_per_page filter.
+		if ( isset( $registered['per_page'] ) ) {
+			$args['posts_per_page'] = $request['per_page'];
+		}
+
+		if ( isset( $registered['sticky'], $request['sticky'] ) ) {
+			$sticky_posts = get_option( 'sticky_posts', array() );
+			if ( ! is_array( $sticky_posts ) ) {
+				$sticky_posts = array();
+			}
+			if ( $request['sticky'] ) {
+				/*
+				 * As post__in will be used to only get sticky posts,
+				 * we have to support the case where post__in was already
+				 * specified.
+				 */
+				$args['post__in'] = $args['post__in'] ? array_intersect( $sticky_posts, $args['post__in'] ) : $sticky_posts;
+
+				/*
+				 * If we intersected, but there are no post ids in common,
+				 * WP_Query won't return "no posts" for post__in = array()
+				 * so we have to fake it a bit.
+				 */
+				if ( ! $args['post__in'] ) {
+					$args['post__in'] = array( 0 );
+				}
+			} elseif ( $sticky_posts ) {
+				/*
+				 * As post___not_in will be used to only get posts that
+				 * are not sticky, we have to support the case where post__not_in
+				 * was already specified.
+				 */
+				$args['post__not_in'] = array_merge( $args['post__not_in'], $sticky_posts );
+			}
+		}
+
+		// Force the post_type argument, since it's not a user input variable.
+		$args['post_type'] = $this->post_type;
+
+		/**
+		 * Filters the query arguments for a request.
+		 *
+		 * Enables adding extra arguments or setting defaults for a post collection request.
+		 *
+		 * @since 4.7.0
+		 *
+		 * @link https://developer.wordpress.org/reference/classes/wp_query/
+		 *
+		 * @param array           $args    Key value array of query var to query value.
+		 * @param WP_REST_Request $request The request used.
+		 */
+		$args = apply_filters( "rest_{$this->post_type}_query", $args, $request );
+		$query_args = $this->prepare_items_query( $args, $request );
+
+		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
+
+		foreach ( $taxonomies as $taxonomy ) {
+			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
+			$tax_exclude = $base . '_exclude';
+
+			if ( ! empty( $request[ $base ] ) ) {
+				$query_args['tax_query'][] = array(
+					'taxonomy'         => $taxonomy->name,
+					'field'            => 'term_id',
+					'terms'            => $request[ $base ],
+					'include_children' => false,
+				);
+			}
+
+			if ( ! empty( $request[ $tax_exclude ] ) ) {
+				$query_args['tax_query'][] = array(
+					'taxonomy'         => $taxonomy->name,
+					'field'            => 'term_id',
+					'terms'            => $request[ $tax_exclude ],
+					'include_children' => false,
+					'operator'         => 'NOT IN',
+				);
+			}
+		}
+
+		$posts_query  = new WP_Query();
+		$query_result = $posts_query->query( $query_args );
+
+		// Allow access to all password protected posts if the context is edit.
+		if ( 'edit' === $request['context'] ) {
+			add_filter( 'post_password_required', '__return_false' );
+		}
+
+		$posts = array();
+
+		foreach ( $query_result as $post ) {
+			if ( ! $this->check_read_permission( $post ) ) {
+				continue;
+			}
+
+			$data    = $this->prepare_item_for_response( $post, $request );
+			$posts[] = $this->prepare_response_for_collection( $data );
+		}
+
+		// Reset filter.
+		if ( 'edit' === $request['context'] ) {
+			remove_filter( 'post_password_required', '__return_false' );
+		}
+
+		$page = (int) $query_args['paged'];
+		$total_posts = $posts_query->found_posts;
+
+		if ( $total_posts < 1 ) {
+			// Out-of-bounds, run the query again without LIMIT for total count.
+			unset( $query_args['paged'] );
+
+			$count_query = new WP_Query();
+			$count_query->query( $query_args );
+			$total_posts = $count_query->found_posts;
+		}
+
+		$max_pages = ceil( $total_posts / (int) $posts_query->query_vars['posts_per_page'] );
+
+		if ( $page > $max_pages && $total_posts > 0 ) {
+			return new WP_Error( 'rest_post_invalid_page_number', __( 'The page number requested is larger than the number of pages available.' ), array( 'status' => 400 ) );
+		}
+
+		$response  = rest_ensure_response( $posts );
+
+		$response->header( 'X-WP-Total', (int) $total_posts );
+		$response->header( 'X-WP-TotalPages', (int) $max_pages );
+
+		$request_params = $request->get_query_params();
+		$base = add_query_arg( $request_params, rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ) );
+
+		if ( $page > 1 ) {
+			$prev_page = $page - 1;
+
+			if ( $prev_page > $max_pages ) {
+				$prev_page = $max_pages;
+			}
+
+			$prev_link = add_query_arg( 'page', $prev_page, $base );
+			$response->link_header( 'prev', $prev_link );
+		}
+		if ( $max_pages > $page ) {
+			$next_page = $page + 1;
+			$next_link = add_query_arg( 'page', $next_page, $base );
+
+			$response->link_header( 'next', $next_link );
+		}
+
+		return $response;
+	}
+
+	/**
+	 * Get the post, if the ID is valid.
+	 *
+	 * @since 4.7.2
+	 *
+	 * @param int $id Supplied ID.
+	 * @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
+	 */
+	protected function get_post( $id ) {
+		$error = new WP_Error( 'rest_post_invalid_id', __( 'Invalid post ID.' ), array( 'status' => 404 ) );
+		if ( (int) $id <= 0 ) {
+			return $error;
+		}
+
+		$post = get_post( (int) $id );
+		if ( empty( $post ) || empty( $post->ID ) || $this->post_type !== $post->post_type ) {
+			return $error;
+		}
+
+		return $post;
+	}
+
+	/**
+	 * Checks if a given request has access to read a post.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return bool|WP_Error True if the request has read access for the item, WP_Error object otherwise.
+	 */
+	public function get_item_permissions_check( $request ) {
+		$post = $this->get_post( $request['id'] );
+		if ( is_wp_error( $post ) ) {
+			return $post;
+		}
+
+		if ( 'edit' === $request['context'] && $post && ! $this->check_update_permission( $post ) ) {
+			return new WP_Error( 'rest_forbidden_context', __( 'Sorry, you are not allowed to edit this post.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		if ( $post && ! empty( $request['password'] ) ) {
+			// Check post password, and return error if invalid.
+			if ( ! hash_equals( $post->post_password, $request['password'] ) ) {
+				return new WP_Error( 'rest_post_incorrect_password', __( 'Incorrect post password.' ), array( 'status' => 403 ) );
+			}
+		}
+
+		// Allow access to all password protected posts if the context is edit.
+		if ( 'edit' === $request['context'] ) {
+			add_filter( 'post_password_required', '__return_false' );
+		}
+
+		if ( $post ) {
+			return $this->check_read_permission( $post );
+		}
+
+		return true;
+	}
+
+	/**
+	 * Checks if the user can access password-protected content.
+	 *
+	 * This method determines whether we need to override the regular password
+	 * check in core with a filter.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_Post         $post    Post to check against.
+	 * @param WP_REST_Request $request Request data to check.
+	 * @return bool True if the user can access password-protected content, otherwise false.
+	 */
+	public function can_access_password_content( $post, $request ) {
+		if ( empty( $post->post_password ) ) {
+			// No filter required.
+			return false;
+		}
+
+		// Edit context always gets access to password-protected posts.
+		if ( 'edit' === $request['context'] ) {
+			return true;
+		}
+
+		// No password, no auth.
+		if ( empty( $request['password'] ) ) {
+			return false;
+		}
+
+		// Double-check the request password.
+		return hash_equals( $post->post_password, $request['password'] );
+	}
+
+	/**
+	 * Retrieves a single post.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+	 */
+	public function get_item( $request ) {
+		$post = $this->get_post( $request['id'] );
+		if ( is_wp_error( $post ) ) {
+			return $post;
+		}
+
+		$data     = $this->prepare_item_for_response( $post, $request );
+		$response = rest_ensure_response( $data );
+
+		if ( is_post_type_viewable( get_post_type_object( $post->post_type ) ) ) {
+			$response->link_header( 'alternate',  get_permalink( $post->ID ), array( 'type' => 'text/html' ) );
+		}
+
+		return $response;
+	}
+
+	/**
+	 * Checks if a given request has access to create a post.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return true|WP_Error True if the request has access to create items, WP_Error object otherwise.
+	 */
+	public function create_item_permissions_check( $request ) {
+		if ( ! empty( $request['id'] ) ) {
+			return new WP_Error( 'rest_post_exists', __( 'Cannot create existing post.' ), array( 'status' => 400 ) );
+		}
+
+		$post_type = get_post_type_object( $this->post_type );
+
+		if ( ! empty( $request['author'] ) && get_current_user_id() !== $request['author'] && ! current_user_can( $post_type->cap->edit_others_posts ) ) {
+			return new WP_Error( 'rest_cannot_edit_others', __( 'Sorry, you are not allowed to create posts as this user.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		if ( ! empty( $request['sticky'] ) && ! current_user_can( $post_type->cap->edit_others_posts ) ) {
+			return new WP_Error( 'rest_cannot_assign_sticky', __( 'Sorry, you are not allowed to make posts sticky.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		if ( ! current_user_can( $post_type->cap->create_posts ) ) {
+			return new WP_Error( 'rest_cannot_create', __( 'Sorry, you are not allowed to create posts as this user.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		if ( ! $this->check_assign_terms_permission( $request ) ) {
+			return new WP_Error( 'rest_cannot_assign_term', __( 'Sorry, you are not allowed to assign the provided terms.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		return true;
+	}
+
+	/**
+	 * Creates a single post.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+	 */
+	public function create_item( $request ) {
+		if ( ! empty( $request['id'] ) ) {
+			return new WP_Error( 'rest_post_exists', __( 'Cannot create existing post.' ), array( 'status' => 400 ) );
+		}
+
+		$prepared_post = $this->prepare_item_for_database( $request );
+
+		if ( is_wp_error( $prepared_post ) ) {
+			return $prepared_post;
+		}
+
+		$prepared_post->post_type = $this->post_type;
+
+		$post_id = wp_insert_post( wp_slash( (array) $prepared_post ), true );
+
+		if ( is_wp_error( $post_id ) ) {
+
+			if ( 'db_insert_error' === $post_id->get_error_code() ) {
+				$post_id->add_data( array( 'status' => 500 ) );
+			} else {
+				$post_id->add_data( array( 'status' => 400 ) );
+			}
+
+			return $post_id;
+		}
+
+		$post = get_post( $post_id );
+
+		/**
+		 * Fires after a single post is created or updated via the REST API.
+		 *
+		 * The dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
+		 *
+		 * @since 4.7.0
+		 *
+		 * @param WP_Post         $post     Inserted or updated post object.
+		 * @param WP_REST_Request $request  Request object.
+		 * @param bool            $creating True when creating a post, false when updating.
+		 */
+		do_action( "rest_insert_{$this->post_type}", $post, $request, true );
+
+		$schema = $this->get_item_schema();
+
+		if ( ! empty( $schema['properties']['sticky'] ) ) {
+			if ( ! empty( $request['sticky'] ) ) {
+				stick_post( $post_id );
+			} else {
+				unstick_post( $post_id );
+			}
+		}
+
+		if ( ! empty( $schema['properties']['featured_media'] ) && isset( $request['featured_media'] ) ) {
+			$this->handle_featured_media( $request['featured_media'], $post_id );
+		}
+
+		if ( ! empty( $schema['properties']['format'] ) && ! empty( $request['format'] ) ) {
+			set_post_format( $post, $request['format'] );
+		}
+
+		if ( ! empty( $schema['properties']['template'] ) && isset( $request['template'] ) ) {
+			$this->handle_template( $request['template'], $post_id, true );
+		}
+
+		$terms_update = $this->handle_terms( $post_id, $request );
+
+		if ( is_wp_error( $terms_update ) ) {
+			return $terms_update;
+		}
+
+		if ( ! empty( $schema['properties']['meta'] ) && isset( $request['meta'] ) ) {
+			$meta_update = $this->meta->update_value( $request['meta'], $post_id );
+
+			if ( is_wp_error( $meta_update ) ) {
+				return $meta_update;
+			}
+		}
+
+		$post = get_post( $post_id );
+		$fields_update = $this->update_additional_fields_for_object( $post, $request );
+
+		if ( is_wp_error( $fields_update ) ) {
+			return $fields_update;
+		}
+
+		$request->set_param( 'context', 'edit' );
+
+		$response = $this->prepare_item_for_response( $post, $request );
+		$response = rest_ensure_response( $response );
+
+		$response->set_status( 201 );
+		$response->header( 'Location', rest_url( sprintf( '%s/%s/%d', $this->namespace, $this->rest_base, $post_id ) ) );
+
+		return $response;
+	}
+
+	/**
+	 * Checks if a given request has access to update a post.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return true|WP_Error True if the request has access to update the item, WP_Error object otherwise.
+	 */
+	public function update_item_permissions_check( $request ) {
+		$post = $this->get_post( $request['id'] );
+		if ( is_wp_error( $post ) ) {
+			return $post;
+		}
+
+		$post_type = get_post_type_object( $this->post_type );
+
+		if ( $post && ! $this->check_update_permission( $post ) ) {
+			return new WP_Error( 'rest_cannot_edit', __( 'Sorry, you are not allowed to edit this post.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		if ( ! empty( $request['author'] ) && get_current_user_id() !== $request['author'] && ! current_user_can( $post_type->cap->edit_others_posts ) ) {
+			return new WP_Error( 'rest_cannot_edit_others', __( 'Sorry, you are not allowed to update posts as this user.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		if ( ! empty( $request['sticky'] ) && ! current_user_can( $post_type->cap->edit_others_posts ) ) {
+			return new WP_Error( 'rest_cannot_assign_sticky', __( 'Sorry, you are not allowed to make posts sticky.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		if ( ! $this->check_assign_terms_permission( $request ) ) {
+			return new WP_Error( 'rest_cannot_assign_term', __( 'Sorry, you are not allowed to assign the provided terms.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		return true;
+	}
+
+	/**
+	 * Updates a single post.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+	 */
+	public function update_item( $request ) {
+		$valid_check = $this->get_post( $request['id'] );
+		if ( is_wp_error( $valid_check ) ) {
+			return $valid_check;
+		}
+
+		$post = $this->prepare_item_for_database( $request );
+
+		if ( is_wp_error( $post ) ) {
+			return $post;
+		}
+
+		// convert the post object to an array, otherwise wp_update_post will expect non-escaped input.
+		$post_id = wp_update_post( wp_slash( (array) $post ), true );
+
+		if ( is_wp_error( $post_id ) ) {
+			if ( 'db_update_error' === $post_id->get_error_code() ) {
+				$post_id->add_data( array( 'status' => 500 ) );
+			} else {
+				$post_id->add_data( array( 'status' => 400 ) );
+			}
+			return $post_id;
+		}
+
+		$post = get_post( $post_id );
+
+		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
+		do_action( "rest_insert_{$this->post_type}", $post, $request, false );
+
+		$schema = $this->get_item_schema();
+
+		if ( ! empty( $schema['properties']['format'] ) && ! empty( $request['format'] ) ) {
+			set_post_format( $post, $request['format'] );
+		}
+
+		if ( ! empty( $schema['properties']['featured_media'] ) && isset( $request['featured_media'] ) ) {
+			$this->handle_featured_media( $request['featured_media'], $post_id );
+		}
+
+		if ( ! empty( $schema['properties']['sticky'] ) && isset( $request['sticky'] ) ) {
+			if ( ! empty( $request['sticky'] ) ) {
+				stick_post( $post_id );
+			} else {
+				unstick_post( $post_id );
+			}
+		}
+
+		if ( ! empty( $schema['properties']['template'] ) && isset( $request['template'] ) ) {
+			$this->handle_template( $request['template'], $post->ID );
+		}
+
+		$terms_update = $this->handle_terms( $post->ID, $request );
+
+		if ( is_wp_error( $terms_update ) ) {
+			return $terms_update;
+		}
+
+		if ( ! empty( $schema['properties']['meta'] ) && isset( $request['meta'] ) ) {
+			$meta_update = $this->meta->update_value( $request['meta'], $post->ID );
+
+			if ( is_wp_error( $meta_update ) ) {
+				return $meta_update;
+			}
+		}
+
+		$post = get_post( $post_id );
+		$fields_update = $this->update_additional_fields_for_object( $post, $request );
+
+		if ( is_wp_error( $fields_update ) ) {
+			return $fields_update;
+		}
+
+		$request->set_param( 'context', 'edit' );
+
+		$response = $this->prepare_item_for_response( $post, $request );
+
+		return rest_ensure_response( $response );
+	}
+
+	/**
+	 * Checks if a given request has access to delete a post.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return true|WP_Error True if the request has access to delete the item, WP_Error object otherwise.
+	 */
+	public function delete_item_permissions_check( $request ) {
+		$post = $this->get_post( $request['id'] );
+		if ( is_wp_error( $post ) ) {
+			return $post;
+		}
+
+		if ( $post && ! $this->check_delete_permission( $post ) ) {
+			return new WP_Error( 'rest_cannot_delete', __( 'Sorry, you are not allowed to delete this post.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		return true;
+	}
+
+	/**
+	 * Deletes a single post.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+	 */
+	public function delete_item( $request ) {
+		$post = $this->get_post( $request['id'] );
+		if ( is_wp_error( $post ) ) {
+			return $post;
+		}
+
+		$id    = $post->ID;
+		$force = (bool) $request['force'];
+
+		$supports_trash = ( EMPTY_TRASH_DAYS > 0 );
+
+		if ( 'attachment' === $post->post_type ) {
+			$supports_trash = $supports_trash && MEDIA_TRASH;
+		}
+
+		/**
+		 * Filters whether a post is trashable.
+		 *
+		 * The dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
+		 *
+		 * Pass false to disable trash support for the post.
+		 *
+		 * @since 4.7.0
+		 *
+		 * @param bool    $supports_trash Whether the post type support trashing.
+		 * @param WP_Post $post           The Post object being considered for trashing support.
+		 */
+		$supports_trash = apply_filters( "rest_{$this->post_type}_trashable", $supports_trash, $post );
+
+		if ( ! $this->check_delete_permission( $post ) ) {
+			return new WP_Error( 'rest_user_cannot_delete_post', __( 'Sorry, you are not allowed to delete this post.' ), array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		$request->set_param( 'context', 'edit' );
+
+
+		// If we're forcing, then delete permanently.
+		if ( $force ) {
+			$previous = $this->prepare_item_for_response( $post, $request );
+			$result = wp_delete_post( $id, true );
+			$response = new WP_REST_Response();
+			$response->set_data( array( 'deleted' => true, 'previous' => $previous->get_data() ) );
+		} else {
+			// If we don't support trashing for this type, error out.
+			if ( ! $supports_trash ) {
+				/* translators: %s: force=true */
+				return new WP_Error( 'rest_trash_not_supported', sprintf( __( "The post does not support trashing. Set '%s' to delete." ), 'force=true' ), array( 'status' => 501 ) );
+			}
+
+			// Otherwise, only trash if we haven't already.
+			if ( 'trash' === $post->post_status ) {
+				return new WP_Error( 'rest_already_trashed', __( 'The post has already been deleted.' ), array( 'status' => 410 ) );
+			}
+
+			// (Note that internally this falls through to `wp_delete_post` if
+			// the trash is disabled.)
+			$result = wp_trash_post( $id );
+			$post = get_post( $id );
+			$response = $this->prepare_item_for_response( $post, $request );
+		}
+
+		if ( ! $result ) {
+			return new WP_Error( 'rest_cannot_delete', __( 'The post cannot be deleted.' ), array( 'status' => 500 ) );
+		}
+
+		/**
+		 * Fires immediately after a single post is deleted or trashed via the REST API.
+		 *
+		 * They dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
+		 *
+		 * @since 4.7.0
+		 *
+		 * @param object           $post     The deleted or trashed post.
+		 * @param WP_REST_Response $response The response data.
+		 * @param WP_REST_Request  $request  The request sent to the API.
+		 */
+		do_action( "rest_delete_{$this->post_type}", $post, $response, $request );
+
+		return $response;
+	}
+
+	/**
+	 * Determines the allowed query_vars for a get_items() response and prepares
+	 * them for WP_Query.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param array           $prepared_args Optional. Prepared WP_Query arguments. Default empty array.
+	 * @param WP_REST_Request $request       Optional. Full details about the request.
+	 * @return array Items query arguments.
+	 */
+	protected function prepare_items_query( $prepared_args = array(), $request = null ) {
+		$query_args = array();
+
+		foreach ( $prepared_args as $key => $value ) {
+			/**
+			 * Filters the query_vars used in get_items() for the constructed query.
+			 *
+			 * The dynamic portion of the hook name, `$key`, refers to the query_var key.
+			 *
+			 * @since 4.7.0
+			 *
+			 * @param string $value The query_var value.
+			 */
+			$query_args[ $key ] = apply_filters( "rest_query_var-{$key}", $value );
+		}
+
+		if ( 'post' !== $this->post_type || ! isset( $query_args['ignore_sticky_posts'] ) ) {
+			$query_args['ignore_sticky_posts'] = true;
+		}
+
+		// Map to proper WP_Query orderby param.
+		if ( isset( $query_args['orderby'] ) && isset( $request['orderby'] ) ) {
+			$orderby_mappings = array(
+				'id'            => 'ID',
+				'include'       => 'post__in',
+				'slug'          => 'post_name',
+				'include_slugs' => 'post_name__in',
+			);
+
+			if ( isset( $orderby_mappings[ $request['orderby'] ] ) ) {
+				$query_args['orderby'] = $orderby_mappings[ $request['orderby'] ];
+			}
+		}
+
+		return $query_args;
+	}
+
+	/**
+	 * Checks the post_date_gmt or modified_gmt and prepare any post or
+	 * modified date for single post output.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string      $date_gmt GMT publication time.
+	 * @param string|null $date     Optional. Local publication time. Default null.
+	 * @return string|null ISO8601/RFC3339 formatted datetime.
+	 */
+	protected function prepare_date_response( $date_gmt, $date = null ) {
+		// Use the date if passed.
+		if ( isset( $date ) ) {
+			return mysql_to_rfc3339( $date );
+		}
+
+		// Return null if $date_gmt is empty/zeros.
+		if ( '0000-00-00 00:00:00' === $date_gmt ) {
+			return null;
+		}
+
+		// Return the formatted datetime.
+		return mysql_to_rfc3339( $date_gmt );
+	}
+
+	/**
+	 * Prepares a single post for create or update.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request Request object.
+	 * @return stdClass|WP_Error Post object or WP_Error.
+	 */
+	protected function prepare_item_for_database( $request ) {
+		$prepared_post = new stdClass;
+
+		// Post ID.
+		if ( isset( $request['id'] ) ) {
+			$existing_post = $this->get_post( $request['id'] );
+			if ( is_wp_error( $existing_post ) ) {
+				return $existing_post;
+			}
+
+			$prepared_post->ID = $existing_post->ID;
+		}
+
+		$schema = $this->get_item_schema();
+
+		// Post title.
+		if ( ! empty( $schema['properties']['title'] ) && isset( $request['title'] ) ) {
+			if ( is_string( $request['title'] ) ) {
+				$prepared_post->post_title = $request['title'];
+			} elseif ( ! empty( $request['title']['raw'] ) ) {
+				$prepared_post->post_title = $request['title']['raw'];
+			}
+		}
+
+		// Post content.
+		if ( ! empty( $schema['properties']['content'] ) && isset( $request['content'] ) ) {
+			if ( is_string( $request['content'] ) ) {
+				$prepared_post->post_content = $request['content'];
+			} elseif ( isset( $request['content']['raw'] ) ) {
+				$prepared_post->post_content = $request['content']['raw'];
+			}
+		}
+
+		// Post excerpt.
+		if ( ! empty( $schema['properties']['excerpt'] ) && isset( $request['excerpt'] ) ) {
+			if ( is_string( $request['excerpt'] ) ) {
+				$prepared_post->post_excerpt = $request['excerpt'];
+			} elseif ( isset( $request['excerpt']['raw'] ) ) {
+				$prepared_post->post_excerpt = $request['excerpt']['raw'];
+			}
+		}
+
+		// Post type.
+		if ( empty( $request['id'] ) ) {
+			// Creating new post, use default type for the controller.
+			$prepared_post->post_type = $this->post_type;
+		} else {
+			// Updating a post, use previous type.
+			$prepared_post->post_type = get_post_type( $request['id'] );
+		}
+
+		$post_type = get_post_type_object( $prepared_post->post_type );
+
+		// Post status.
+		if ( ! empty( $schema['properties']['status'] ) && isset( $request['status'] ) ) {
+			$status = $this->handle_status_param( $request['status'], $post_type );
+
+			if ( is_wp_error( $status ) ) {
+				return $status;
+			}
+
+			$prepared_post->post_status = $status;
+		}
+
+		// Post date.
+		if ( ! empty( $schema['properties']['date'] ) && ! empty( $request['date'] ) ) {
+			$date_data = rest_get_date_with_gmt( $request['date'] );
+
+			if ( ! empty( $date_data ) ) {
+				list( $prepared_post->post_date, $prepared_post->post_date_gmt ) = $date_data;
+				$prepared_post->edit_date = true;
+			}
+		} elseif ( ! empty( $schema['properties']['date_gmt'] ) && ! empty( $request['date_gmt'] ) ) {
+			$date_data = rest_get_date_with_gmt( $request['date_gmt'], true );
+
+			if ( ! empty( $date_data ) ) {
+				list( $prepared_post->post_date, $prepared_post->post_date_gmt ) = $date_data;
+				$prepared_post->edit_date = true;
+			}
+		}
+
+		// Post slug.
+		if ( ! empty( $schema['properties']['slug'] ) && isset( $request['slug'] ) ) {
+			$prepared_post->post_name = $request['slug'];
+		}
+
+		// Author.
+		if ( ! empty( $schema['properties']['author'] ) && ! empty( $request['author'] ) ) {
+			$post_author = (int) $request['author'];
+
+			if ( get_current_user_id() !== $post_author ) {
+				$user_obj = get_userdata( $post_author );
+
+				if ( ! $user_obj ) {
+					return new WP_Error( 'rest_invalid_author', __( 'Invalid author ID.' ), array( 'status' => 400 ) );
+				}
+			}
+
+			$prepared_post->post_author = $post_author;
+		}
+
+		// Post password.
+		if ( ! empty( $schema['properties']['password'] ) && isset( $request['password'] ) ) {
+			$prepared_post->post_password = $request['password'];
+
+			if ( '' !== $request['password'] ) {
+				if ( ! empty( $schema['properties']['sticky'] ) && ! empty( $request['sticky'] ) ) {
+					return new WP_Error( 'rest_invalid_field', __( 'A post can not be sticky and have a password.' ), array( 'status' => 400 ) );
+				}
+
+				if ( ! empty( $prepared_post->ID ) && is_sticky( $prepared_post->ID ) ) {
+					return new WP_Error( 'rest_invalid_field', __( 'A sticky post can not be password protected.' ), array( 'status' => 400 ) );
+				}
+			}
+		}
+
+		if ( ! empty( $schema['properties']['sticky'] ) && ! empty( $request['sticky'] ) ) {
+			if ( ! empty( $prepared_post->ID ) && post_password_required( $prepared_post->ID ) ) {
+				return new WP_Error( 'rest_invalid_field', __( 'A password protected post can not be set to sticky.' ), array( 'status' => 400 ) );
+			}
+		}
+
+		// Parent.
+		if ( ! empty( $schema['properties']['parent'] ) && isset( $request['parent'] ) ) {
+			if ( 0 === (int) $request['parent'] ) {
+				$prepared_post->post_parent = 0;
+			} else {
+				$parent = get_post( (int) $request['parent'] );
+				if ( empty( $parent ) ) {
+					return new WP_Error( 'rest_post_invalid_id', __( 'Invalid post parent ID.' ), array( 'status' => 400 ) );
+				}
+				$prepared_post->post_parent = (int) $parent->ID;
+			}
+		}
+
+		// Menu order.
+		if ( ! empty( $schema['properties']['menu_order'] ) && isset( $request['menu_order'] ) ) {
+			$prepared_post->menu_order = (int) $request['menu_order'];
+		}
+
+		// Comment status.
+		if ( ! empty( $schema['properties']['comment_status'] ) && ! empty( $request['comment_status'] ) ) {
+			$prepared_post->comment_status = $request['comment_status'];
+		}
+
+		// Ping status.
+		if ( ! empty( $schema['properties']['ping_status'] ) && ! empty( $request['ping_status'] ) ) {
+			$prepared_post->ping_status = $request['ping_status'];
+		}
+
+		if ( ! empty( $schema['properties']['template'] ) ) {
+			// Force template to null so that it can be handled exclusively by the REST controller.
+			$prepared_post->page_template = null;
+		}
+
+		/**
+		 * Filters a post before it is inserted via the REST API.
+		 *
+		 * The dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
+		 *
+		 * @since 4.7.0
+		 *
+		 * @param stdClass        $prepared_post An object representing a single post prepared
+		 *                                       for inserting or updating the database.
+		 * @param WP_REST_Request $request       Request object.
+		 */
+		return apply_filters( "rest_pre_insert_{$this->post_type}", $prepared_post, $request );
+
+	}
+
+	/**
+	 * Determines validity and normalizes the given status parameter.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string $post_status Post status.
+	 * @param object $post_type   Post type.
+	 * @return string|WP_Error Post status or WP_Error if lacking the proper permission.
+	 */
+	protected function handle_status_param( $post_status, $post_type ) {
+
+		switch ( $post_status ) {
+			case 'draft':
+			case 'pending':
+				break;
+			case 'private':
+				if ( ! current_user_can( $post_type->cap->publish_posts ) ) {
+					return new WP_Error( 'rest_cannot_publish', __( 'Sorry, you are not allowed to create private posts in this post type.' ), array( 'status' => rest_authorization_required_code() ) );
+				}
+				break;
+			case 'publish':
+			case 'future':
+				if ( ! current_user_can( $post_type->cap->publish_posts ) ) {
+					return new WP_Error( 'rest_cannot_publish', __( 'Sorry, you are not allowed to publish posts in this post type.' ), array( 'status' => rest_authorization_required_code() ) );
+				}
+				break;
+			default:
+				if ( ! get_post_status_object( $post_status ) ) {
+					$post_status = 'draft';
+				}
+				break;
+		}
+
+		return $post_status;
+	}
+
+	/**
+	 * Determines the featured media based on a request param.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param int $featured_media Featured Media ID.
+	 * @param int $post_id        Post ID.
+	 * @return bool|WP_Error Whether the post thumbnail was successfully deleted, otherwise WP_Error.
+	 */
+	protected function handle_featured_media( $featured_media, $post_id ) {
+
+		$featured_media = (int) $featured_media;
+		if ( $featured_media ) {
+			$result = set_post_thumbnail( $post_id, $featured_media );
+			if ( $result ) {
+				return true;
+			} else {
+				return new WP_Error( 'rest_invalid_featured_media', __( 'Invalid featured media ID.' ), array( 'status' => 400 ) );
+			}
+		} else {
+			return delete_post_thumbnail( $post_id );
+		}
+
+	}
+
+	/**
+	 * Check whether the template is valid for the given post.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param string          $template Page template filename.
+	 * @param WP_REST_Request $request  Request.
+	 * @return bool|WP_Error True if template is still valid or if the same as existing value, or false if template not supported.
+	 */
+	public function check_template( $template, $request ) {
+
+		if ( ! $template ) {
+			return true;
+		}
+
+		if ( $request['id'] ) {
+			$current_template = get_page_template_slug( $request['id'] );
+		} else {
+			$current_template = '';
+		}
+
+		// Always allow for updating a post to the same template, even if that template is no longer supported.
+		if ( $template === $current_template ) {
+			return true;
+		}
+
+		// If this is a create request, get_post() will return null and wp theme will fallback to the passed post type.
+		$allowed_templates = wp_get_theme()->get_page_templates( get_post( $request['id'] ), $this->post_type );
+
+		if ( isset( $allowed_templates[ $template ] ) ) {
+			return true;
+		}
+
+		/* translators: 1: parameter, 2: list of valid values */
+		return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not one of %2$s.' ), 'template', implode( ', ', array_keys( $allowed_templates ) ) ) );
+	}
+
+	/**
+	 * Sets the template for a post.
+	 *
+	 * @since 4.7.0
+	 * @since 4.9.0 Introduced the $validate parameter.
+	 *
+	 * @param string  $template Page template filename.
+	 * @param integer $post_id  Post ID.
+	 * @param bool    $validate Whether to validate that the template selected is valid.
+	 */
+	public function handle_template( $template, $post_id, $validate = false ) {
+
+		if ( $validate && ! array_key_exists( $template, wp_get_theme()->get_page_templates( get_post( $post_id ) ) ) ) {
+			$template = '';
+		}
+
+		update_post_meta( $post_id, '_wp_page_template', $template );
+	}
+
+	/**
+	 * Updates the post's terms from a REST request.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param int             $post_id The post ID to update the terms form.
+	 * @param WP_REST_Request $request The request object with post and terms data.
+	 * @return null|WP_Error WP_Error on an error assigning any of the terms, otherwise null.
+	 */
+	protected function handle_terms( $post_id, $request ) {
+		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
+
+		foreach ( $taxonomies as $taxonomy ) {
+			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
+
+			if ( ! isset( $request[ $base ] ) ) {
+				continue;
+			}
+
+			$result = wp_set_object_terms( $post_id, $request[ $base ], $taxonomy->name );
+
+			if ( is_wp_error( $result ) ) {
+				return $result;
+			}
+		}
+	}
+
+	/**
+	 * Checks whether current user can assign all terms sent with the current request.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_REST_Request $request The request object with post and terms data.
+	 * @return bool Whether the current user can assign the provided terms.
+	 */
+	protected function check_assign_terms_permission( $request ) {
+		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
+		foreach ( $taxonomies as $taxonomy ) {
+			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
+
+			if ( ! isset( $request[ $base ] ) ) {
+				continue;
+			}
+
+			foreach ( $request[ $base ] as $term_id ) {
+				// Invalid terms will be rejected later.
+				if ( ! get_term( $term_id, $taxonomy->name ) ) {
+					continue;
+				}
+
+				if ( ! current_user_can( 'assign_term', (int) $term_id ) ) {
+					return false;
+				}
+			}
+		}
+
+		return true;
+	}
+
+	/**
+	 * Checks if a given post type can be viewed or managed.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param object|string $post_type Post type name or object.
+	 * @return bool Whether the post type is allowed in REST.
+	 */
+	protected function check_is_post_type_allowed( $post_type ) {
+		if ( ! is_object( $post_type ) ) {
+			$post_type = get_post_type_object( $post_type );
+		}
+
+		if ( ! empty( $post_type ) && ! empty( $post_type->show_in_rest ) ) {
+			return true;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Checks if a post can be read.
+	 *
+	 * Correctly handles posts with the inherit status.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param object $post Post object.
+	 * @return bool Whether the post can be read.
+	 */
+	public function check_read_permission( $post ) {
+		$post_type = get_post_type_object( $post->post_type );
+		if ( ! $this->check_is_post_type_allowed( $post_type ) ) {
+			return false;
+		}
+
+		// Is the post readable?
+		if ( 'publish' === $post->post_status || current_user_can( $post_type->cap->read_post, $post->ID ) ) {
+			return true;
+		}
+
+		$post_status_obj = get_post_status_object( $post->post_status );
+		if ( $post_status_obj && $post_status_obj->public ) {
+			return true;
+		}
+
+		// Can we read the parent if we're inheriting?
+		if ( 'inherit' === $post->post_status && $post->post_parent > 0 ) {
+			$parent = get_post( $post->post_parent );
+			if ( $parent ) {
+				return $this->check_read_permission( $parent );
+			}
+		}
+
+		/*
+		 * If there isn't a parent, but the status is set to inherit, assume
+		 * it's published (as per get_post_status()).
+		 */
+		if ( 'inherit' === $post->post_status ) {
+			return true;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Checks if a post can be edited.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param object $post Post object.
+	 * @return bool Whether the post can be edited.
+	 */
+	protected function check_update_permission( $post ) {
+		$post_type = get_post_type_object( $post->post_type );
+
+		if ( ! $this->check_is_post_type_allowed( $post_type ) ) {
+			return false;
+		}
+
+		return current_user_can( $post_type->cap->edit_post, $post->ID );
+	}
+
+	/**
+	 * Checks if a post can be created.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param object $post Post object.
+	 * @return bool Whether the post can be created.
+	 */
+	protected function check_create_permission( $post ) {
+		$post_type = get_post_type_object( $post->post_type );
+
+		if ( ! $this->check_is_post_type_allowed( $post_type ) ) {
+			return false;
+		}
+
+		return current_user_can( $post_type->cap->create_posts );
+	}
+
+	/**
+	 * Checks if a post can be deleted.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param object $post Post object.
+	 * @return bool Whether the post can be deleted.
+	 */
+	protected function check_delete_permission( $post ) {
+		$post_type = get_post_type_object( $post->post_type );
+
+		if ( ! $this->check_is_post_type_allowed( $post_type ) ) {
+			return false;
+		}
+
+		return current_user_can( $post_type->cap->delete_post, $post->ID );
+	}
+
+	/**
+	 * Prepares a single post output for response.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_Post         $post    Post object.
+	 * @param WP_REST_Request $request Request object.
+	 * @return WP_REST_Response Response object.
+	 */
+	public function prepare_item_for_response( $post, $request ) {
+		$GLOBALS['post'] = $post;
+
+		setup_postdata( $post );
+
+		$fields = $this->get_fields_for_response( $request );
+
+		// Base fields for every post.
+		$data = array();
+
+		if ( in_array( 'id', $fields, true ) ) {
+			$data['id'] = $post->ID;
+		}
+
+		if ( in_array( 'date', $fields, true ) ) {
+			$data['date'] = $this->prepare_date_response( $post->post_date_gmt, $post->post_date );
+		}
+
+		if ( in_array( 'date_gmt', $fields, true ) ) {
+			// For drafts, `post_date_gmt` may not be set, indicating that the
+			// date of the draft should be updated each time it is saved (see
+			// #38883).  In this case, shim the value based on the `post_date`
+			// field with the site's timezone offset applied.
+			if ( '0000-00-00 00:00:00' === $post->post_date_gmt ) {
+				$post_date_gmt = get_gmt_from_date( $post->post_date );
+			} else {
+				$post_date_gmt = $post->post_date_gmt;
+			}
+			$data['date_gmt'] = $this->prepare_date_response( $post_date_gmt );
+		}
+
+		if ( in_array( 'guid', $fields, true ) ) {
+			$data['guid'] = array(
+				/** This filter is documented in wp-includes/post-template.php */
+				'rendered' => apply_filters( 'get_the_guid', $post->guid, $post->ID ),
+				'raw'      => $post->guid,
+			);
+		}
+
+		if ( in_array( 'modified', $fields, true ) ) {
+			$data['modified'] = $this->prepare_date_response( $post->post_modified_gmt, $post->post_modified );
+		}
+
+		if ( in_array( 'modified_gmt', $fields, true ) ) {
+			// For drafts, `post_modified_gmt` may not be set (see
+			// `post_date_gmt` comments above).  In this case, shim the value
+			// based on the `post_modified` field with the site's timezone
+			// offset applied.
+			if ( '0000-00-00 00:00:00' === $post->post_modified_gmt ) {
+				$post_modified_gmt = date( 'Y-m-d H:i:s', strtotime( $post->post_modified ) - ( get_option( 'gmt_offset' ) * 3600 ) );
+			} else {
+				$post_modified_gmt = $post->post_modified_gmt;
+			}
+			$data['modified_gmt'] = $this->prepare_date_response( $post_modified_gmt );
+		}
+
+		if ( in_array( 'password', $fields, true ) ) {
+			$data['password'] = $post->post_password;
+		}
+
+		if ( in_array( 'slug', $fields, true ) ) {
+			$data['slug'] = $post->post_name;
+		}
+
+		if ( in_array( 'status', $fields, true ) ) {
+			$data['status'] = $post->post_status;
+		}
+
+		if ( in_array( 'type', $fields, true ) ) {
+			$data['type'] = $post->post_type;
+		}
+
+		if ( in_array( 'link', $fields, true ) ) {
+			$data['link'] = get_permalink( $post->ID );
+		}
+
+		if ( in_array( 'title', $fields, true ) ) {
+			add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+
+			$data['title'] = array(
+				'raw'      => $post->post_title,
+				'rendered' => get_the_title( $post->ID ),
+			);
+
+			remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+		}
+
+		$has_password_filter = false;
+
+		if ( $this->can_access_password_content( $post, $request ) ) {
+			// Allow access to the post, permissions already checked before.
+			add_filter( 'post_password_required', '__return_false' );
+
+			$has_password_filter = true;
+		}
+
+		if ( in_array( 'content', $fields, true ) ) {
+			$data['content'] = array(
+				'raw'       => $post->post_content,
+				/** This filter is documented in wp-includes/post-template.php */
+				'rendered'  => post_password_required( $post ) ? '' : apply_filters( 'the_content', $post->post_content ),
+				'protected' => (bool) $post->post_password,
+			);
+		}
+
+		if ( in_array( 'excerpt', $fields, true ) ) {
+			/** This filter is documented in wp-includes/post-template.php */
+			$excerpt = apply_filters( 'the_excerpt', apply_filters( 'get_the_excerpt', $post->post_excerpt, $post ) );
+			$data['excerpt'] = array(
+				'raw'       => $post->post_excerpt,
+				'rendered'  => post_password_required( $post ) ? '' : $excerpt,
+				'protected' => (bool) $post->post_password,
+			);
+		}
+
+		if ( $has_password_filter ) {
+			// Reset filter.
+			remove_filter( 'post_password_required', '__return_false' );
+		}
+
+		if ( in_array( 'author', $fields, true ) ) {
+			$data['author'] = (int) $post->post_author;
+		}
+
+		if ( in_array( 'featured_media', $fields, true ) ) {
+			$data['featured_media'] = (int) get_post_thumbnail_id( $post->ID );
+		}
+
+		if ( in_array( 'parent', $fields, true ) ) {
+			$data['parent'] = (int) $post->post_parent;
+		}
+
+		if ( in_array( 'menu_order', $fields, true ) ) {
+			$data['menu_order'] = (int) $post->menu_order;
+		}
+
+		if ( in_array( 'comment_status', $fields, true ) ) {
+			$data['comment_status'] = $post->comment_status;
+		}
+
+		if ( in_array( 'ping_status', $fields, true ) ) {
+			$data['ping_status'] = $post->ping_status;
+		}
+
+		if ( in_array( 'sticky', $fields, true ) ) {
+			$data['sticky'] = is_sticky( $post->ID );
+		}
+
+		if ( in_array( 'template', $fields, true ) ) {
+			if ( $template = get_page_template_slug( $post->ID ) ) {
+				$data['template'] = $template;
+			} else {
+				$data['template'] = '';
+			}
+		}
+
+		if ( in_array( 'format', $fields, true ) ) {
+			$data['format'] = get_post_format( $post->ID );
+
+			// Fill in blank post format.
+			if ( empty( $data['format'] ) ) {
+				$data['format'] = 'standard';
+			}
+		}
+
+		if ( in_array( 'meta', $fields, true ) ) {
+			$data['meta'] = $this->meta->get_value( $post->ID, $request );
+		}
+
+		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
+
+		foreach ( $taxonomies as $taxonomy ) {
+			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
+
+			if ( in_array( $base, $fields, true ) ) {
+				$terms = get_the_terms( $post, $taxonomy->name );
+				$data[ $base ] = $terms ? array_values( wp_list_pluck( $terms, 'term_id' ) ) : array();
+			}
+		}
+
+		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
+		$data    = $this->add_additional_fields_to_object( $data, $request );
+		$data    = $this->filter_response_by_context( $data, $context );
+
+		// Wrap the data in a response object.
+		$response = rest_ensure_response( $data );
+
+		$links = $this->prepare_links( $post );
+		$response->add_links( $links );
+
+		if ( ! empty( $links['self']['href'] ) ) {
+			$actions = $this->get_available_actions( $post, $request );
+
+			$self = $links['self']['href'];
+
+			foreach ( $actions as $rel ) {
+				$response->add_link( $rel, $self );
+			}
+		}
+
+		/**
+		 * Filters the post data for a response.
+		 *
+		 * The dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
+		 *
+		 * @since 4.7.0
+		 *
+		 * @param WP_REST_Response $response The response object.
+		 * @param WP_Post          $post     Post object.
+		 * @param WP_REST_Request  $request  Request object.
+		 */
+		return apply_filters( "rest_prepare_{$this->post_type}", $response, $post, $request );
+	}
+
+	/**
+	 * 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 4.7.0
+	 *
+	 * @return string Protected title format.
+	 */
+	public function protected_title_format() {
+		return '%s';
+	}
+
+	/**
+	 * Prepares links for the request.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param WP_Post $post Post object.
+	 * @return array Links for the given post.
+	 */
+	protected function prepare_links( $post ) {
+		$base = sprintf( '%s/%s', $this->namespace, $this->rest_base );
+
+		// Entity meta.
+		$links = array(
+			'self' => array(
+				'href'   => rest_url( trailingslashit( $base ) . $post->ID ),
+			),
+			'collection' => array(
+				'href'   => rest_url( $base ),
+			),
+			'about'      => array(
+				'href'   => rest_url( 'wp/v2/types/' . $this->post_type ),
+			),
+		);
+
+		if ( ( in_array( $post->post_type, array( 'post', 'page' ), true ) || post_type_supports( $post->post_type, 'author' ) )
+			&& ! empty( $post->post_author ) ) {
+			$links['author'] = array(
+				'href'       => rest_url( 'wp/v2/users/' . $post->post_author ),
+				'embeddable' => true,
+			);
+		}
+
+		if ( in_array( $post->post_type, array( 'post', 'page' ), true ) || post_type_supports( $post->post_type, 'comments' ) ) {
+			$replies_url = rest_url( 'wp/v2/comments' );
+			$replies_url = add_query_arg( 'post', $post->ID, $replies_url );
+
+			$links['replies'] = array(
+				'href'       => $replies_url,
+				'embeddable' => true,
+			);
+		}
+
+		if ( in_array( $post->post_type, array( 'post', 'page' ), true ) || post_type_supports( $post->post_type, 'revisions' ) ) {
+			$revisions       = wp_get_post_revisions( $post->ID, array( 'fields' => 'ids' ) );
+			$revisions_count = count( $revisions );
+
+			$links['version-history'] = array(
+				'href'  => rest_url( trailingslashit( $base ) . $post->ID . '/revisions' ),
+				'count' => $revisions_count,
+			);
+
+			if ( $revisions_count > 0 ) {
+				$last_revision = array_shift( $revisions );
+
+				$links['predecessor-version'] = array(
+					'href' => rest_url( trailingslashit( $base ) . $post->ID . '/revisions/' . $last_revision ),
+					'id'   => $last_revision,
+				);
+			}
+
+		}
+
+		$post_type_obj = get_post_type_object( $post->post_type );
+
+		if ( $post_type_obj->hierarchical && ! empty( $post->post_parent ) ) {
+			$links['up'] = array(
+				'href'       => rest_url( trailingslashit( $base ) . (int) $post->post_parent ),
+				'embeddable' => true,
+			);
+		}
+
+		// If we have a featured media, add that.
+		if ( $featured_media = get_post_thumbnail_id( $post->ID ) ) {
+			$image_url = rest_url( 'wp/v2/media/' . $featured_media );
+
+			$links['https://api.w.org/featuredmedia'] = array(
+				'href'       => $image_url,
+				'embeddable' => true,
+			);
+		}
+
+		if ( ! in_array( $post->post_type, array( 'attachment', 'nav_menu_item', 'revision' ), true ) ) {
+			$attachments_url = rest_url( 'wp/v2/media' );
+			$attachments_url = add_query_arg( 'parent', $post->ID, $attachments_url );
+
+			$links['https://api.w.org/attachment'] = array(
+				'href' => $attachments_url,
+			);
+		}
+
+		$taxonomies = get_object_taxonomies( $post->post_type );
+
+		if ( ! empty( $taxonomies ) ) {
+			$links['https://api.w.org/term'] = array();
+
+			foreach ( $taxonomies as $tax ) {
+				$taxonomy_obj = get_taxonomy( $tax );
+
+				// Skip taxonomies that are not public.
+				if ( empty( $taxonomy_obj->show_in_rest ) ) {
+					continue;
+				}
+
+				$tax_base = ! empty( $taxonomy_obj->rest_base ) ? $taxonomy_obj->rest_base : $tax;
+
+				$terms_url = add_query_arg(
+					'post',
+					$post->ID,
+					rest_url( 'wp/v2/' . $tax_base )
+				);
+
+				$links['https://api.w.org/term'][] = array(
+					'href'       => $terms_url,
+					'taxonomy'   => $tax,
+					'embeddable' => true,
+				);
+			}
+		}
+
+		return $links;
+	}
+
+	/**
+	 * Get the link relations available for the post and current user.
+	 *
+	 * @since 4.9.8
+	 *
+	 * @param WP_Post $post Post object.
+	 * @param WP_REST_Request Request object.
+	 *
+	 * @return array List of link relations.
+	 */
+	protected function get_available_actions( $post, $request ) {
+
+		if ( 'edit' !== $request['context'] ) {
+			return array();
+		}
+
+		$rels = array();
+
+		$post_type = get_post_type_object( $post->post_type );
+
+		if ( 'attachment' !== $this->post_type && current_user_can( $post_type->cap->publish_posts ) ) {
+			$rels[] = 'https://api.w.org/action-publish';
+		}
+
+		if ( 'post' === $post_type->name ) {
+			if ( current_user_can( $post_type->cap->edit_others_posts ) && current_user_can( $post_type->cap->publish_posts ) ) {
+				$rels[] = 'https://api.w.org/action-sticky';
+			}
+		}
+
+		if ( post_type_supports( $post_type->name, 'author' ) ) {
+			if ( current_user_can( $post_type->cap->edit_others_posts ) ) {
+				$rels[] = 'https://api.w.org/action-assign-author';
+			}
+		}
+
+		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
+
+		foreach ( $taxonomies as $tax ) {
+			$tax_base   = ! empty( $tax->rest_base ) ? $tax->rest_base : $tax->name;
+			$create_cap = is_taxonomy_hierarchical( $tax->name ) ? $tax->cap->edit_terms : $tax->cap->assign_terms;
+
+			if ( current_user_can( $create_cap ) ) {
+				$rels[] = 'https://api.w.org/action-create-' . $tax_base;
+			}
+
+			if ( current_user_can( $tax->cap->assign_terms ) ) {
+				$rels[] = 'https://api.w.org/action-assign-' . $tax_base;
+			}
+		}
+
+		return $rels;
+	}
+
+	/**
+	 * Retrieves the post's schema, conforming to JSON Schema.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @return array Item schema data.
+	 */
+	public function get_item_schema() {
+
+		$schema = array(
+			'$schema'    => 'http://json-schema.org/draft-04/schema#',
+			'title'      => $this->post_type,
+			'type'       => 'object',
+			// Base properties for every Post.
+			'properties' => array(
+				'date'            => array(
+					'description' => __( "The date the object was published, in the site's timezone." ),
+					'type'        => 'string',
+					'format'      => 'date-time',
+					'context'     => array( 'view', 'edit', 'embed' ),
+				),
+				'date_gmt'        => array(
+					'description' => __( 'The date the object was published, as GMT.' ),
+					'type'        => 'string',
+					'format'      => 'date-time',
+					'context'     => array( 'view', 'edit' ),
+				),
+				'guid'            => array(
+					'description' => __( 'The globally unique identifier for the object.' ),
+					'type'        => 'object',
+					'context'     => array( 'view', 'edit' ),
+					'readonly'    => true,
+					'properties'  => array(
+						'raw'      => array(
+							'description' => __( 'GUID for the object, as it exists in the database.' ),
+							'type'        => 'string',
+							'context'     => array( 'edit' ),
+							'readonly'    => true,
+						),
+						'rendered' => array(
+							'description' => __( 'GUID for the object, transformed for display.' ),
+							'type'        => 'string',
+							'context'     => array( 'view', 'edit' ),
+							'readonly'    => true,
+						),
+					),
+				),
+				'id'              => array(
+					'description' => __( 'Unique identifier for the object.' ),
+					'type'        => 'integer',
+					'context'     => array( 'view', 'edit', 'embed' ),
+					'readonly'    => true,
+				),
+				'link'            => array(
+					'description' => __( 'URL to the object.' ),
+					'type'        => 'string',
+					'format'      => 'uri',
+					'context'     => array( 'view', 'edit', 'embed' ),
+					'readonly'    => true,
+				),
+				'modified'        => array(
+					'description' => __( "The date the object was last modified, in the site's timezone." ),
+					'type'        => 'string',
+					'format'      => 'date-time',
+					'context'     => array( 'view', 'edit' ),
+					'readonly'    => true,
+				),
+				'modified_gmt'    => array(
+					'description' => __( 'The date the object was last modified, as GMT.' ),
+					'type'        => 'string',
+					'format'      => 'date-time',
+					'context'     => array( 'view', 'edit' ),
+					'readonly'    => true,
+				),
+				'slug'            => array(
+					'description' => __( 'An alphanumeric identifier for the object unique to its type.' ),
+					'type'        => 'string',
+					'context'     => array( 'view', 'edit', 'embed' ),
+					'arg_options' => array(
+						'sanitize_callback' => array( $this, 'sanitize_slug' ),
+					),
+				),
+				'status'          => array(
+					'description' => __( 'A named status for the object.' ),
+					'type'        => 'string',
+					'enum'        => array_keys( get_post_stati( array( 'internal' => false ) ) ),
+					'context'     => array( 'view', 'edit' ),
+				),
+				'type'            => array(
+					'description' => __( 'Type of Post for the object.' ),
+					'type'        => 'string',
+					'context'     => array( 'view', 'edit', 'embed' ),
+					'readonly'    => true,
+				),
+				'password'        => array(
+					'description' => __( 'A password to protect access to the content and excerpt.' ),
+					'type'        => 'string',
+					'context'     => array( 'edit' ),
+				),
+			),
+		);
+
+		$post_type_obj = get_post_type_object( $this->post_type );
+
+		if ( $post_type_obj->hierarchical ) {
+			$schema['properties']['parent'] = array(
+				'description' => __( 'The ID for the parent of the object.' ),
+				'type'        => 'integer',
+				'context'     => array( 'view', 'edit' ),
+			);
+		}
+
+		$post_type_attributes = array(
+			'title',
+			'editor',
+			'author',
+			'excerpt',
+			'thumbnail',
+			'comments',
+			'revisions',
+			'page-attributes',
+			'post-formats',
+			'custom-fields',
+		);
+		$fixed_schemas = array(
+			'post' => array(
+				'title',
+				'editor',
+				'author',
+				'excerpt',
+				'thumbnail',
+				'comments',
+				'revisions',
+				'post-formats',
+				'custom-fields',
+			),
+			'page' => array(
+				'title',
+				'editor',
+				'author',
+				'excerpt',
+				'thumbnail',
+				'comments',
+				'revisions',
+				'page-attributes',
+				'custom-fields',
+			),
+			'attachment' => array(
+				'title',
+				'author',
+				'comments',
+				'revisions',
+				'custom-fields',
+			),
+		);
+		foreach ( $post_type_attributes as $attribute ) {
+			if ( isset( $fixed_schemas[ $this->post_type ] ) && ! in_array( $attribute, $fixed_schemas[ $this->post_type ], true ) ) {
+				continue;
+			} elseif ( ! isset( $fixed_schemas[ $this->post_type ] ) && ! post_type_supports( $this->post_type, $attribute ) ) {
+				continue;
+			}
+
+			switch ( $attribute ) {
+
+				case 'title':
+					$schema['properties']['title'] = array(
+						'description' => __( 'The title for the object.' ),
+						'type'        => 'object',
+						'context'     => array( 'view', 'edit', 'embed' ),
+						'arg_options' => array(
+							'sanitize_callback' => null, // Note: sanitization implemented in self::prepare_item_for_database()
+							'validate_callback' => null, // Note: validation implemented in self::prepare_item_for_database()
+						),
+						'properties'  => array(
+							'raw' => array(
+								'description' => __( 'Title for the object, as it exists in the database.' ),
+								'type'        => 'string',
+								'context'     => array( 'edit' ),
+							),
+							'rendered' => array(
+								'description' => __( 'HTML title for the object, transformed for display.' ),
+								'type'        => 'string',
+								'context'     => array( 'view', 'edit', 'embed' ),
+								'readonly'    => true,
+							),
+						),
+					);
+					break;
+
+				case 'editor':
+					$schema['properties']['content'] = array(
+						'description' => __( 'The content for the object.' ),
+						'type'        => 'object',
+						'context'     => array( 'view', 'edit' ),
+						'arg_options' => array(
+							'sanitize_callback' => null, // Note: sanitization implemented in self::prepare_item_for_database()
+							'validate_callback' => null, // Note: validation implemented in self::prepare_item_for_database()
+						),
+						'properties'  => array(
+							'raw' => array(
+								'description' => __( 'Content for the object, as it exists in the database.' ),
+								'type'        => 'string',
+								'context'     => array( 'edit' ),
+							),
+							'rendered' => array(
+								'description' => __( 'HTML content for the object, transformed for display.' ),
+								'type'        => 'string',
+								'context'     => array( 'view', 'edit' ),
+								'readonly'    => true,
+							),
+							'protected'       => array(
+								'description' => __( 'Whether the content is protected with a password.' ),
+								'type'        => 'boolean',
+								'context'     => array( 'view', 'edit', 'embed' ),
+								'readonly'    => true,
+							),
+						),
+					);
+					break;
+
+				case 'author':
+					$schema['properties']['author'] = array(
+						'description' => __( 'The ID for the author of the object.' ),
+						'type'        => 'integer',
+						'context'     => array( 'view', 'edit', 'embed' ),
+					);
+					break;
+
+				case 'excerpt':
+					$schema['properties']['excerpt'] = array(
+						'description' => __( 'The excerpt for the object.' ),
+						'type'        => 'object',
+						'context'     => array( 'view', 'edit', 'embed' ),
+						'arg_options' => array(
+							'sanitize_callback' => null, // Note: sanitization implemented in self::prepare_item_for_database()
+							'validate_callback' => null, // Note: validation implemented in self::prepare_item_for_database()
+						),
+						'properties'  => array(
+							'raw' => array(
+								'description' => __( 'Excerpt for the object, as it exists in the database.' ),
+								'type'        => 'string',
+								'context'     => array( 'edit' ),
+							),
+							'rendered' => array(
+								'description' => __( 'HTML excerpt for the object, transformed for display.' ),
+								'type'        => 'string',
+								'context'     => array( 'view', 'edit', 'embed' ),
+								'readonly'    => true,
+							),
+							'protected'       => array(
+								'description' => __( 'Whether the excerpt is protected with a password.' ),
+								'type'        => 'boolean',
+								'context'     => array( 'view', 'edit', 'embed' ),
+								'readonly'    => true,
+							),
+						),
+					);
+					break;
+
+				case 'thumbnail':
+					$schema['properties']['featured_media'] = array(
+						'description' => __( 'The ID of the featured media for the object.' ),
+						'type'        => 'integer',
+						'context'     => array( 'view', 'edit', 'embed' ),
+					);
+					break;
+
+				case 'comments':
+					$schema['properties']['comment_status'] = array(
+						'description' => __( 'Whether or not comments are open on the object.' ),
+						'type'        => 'string',
+						'enum'        => array( 'open', 'closed' ),
+						'context'     => array( 'view', 'edit' ),
+					);
+					$schema['properties']['ping_status'] = array(
+						'description' => __( 'Whether or not the object can be pinged.' ),
+						'type'        => 'string',
+						'enum'        => array( 'open', 'closed' ),
+						'context'     => array( 'view', 'edit' ),
+					);
+					break;
+
+				case 'page-attributes':
+					$schema['properties']['menu_order'] = array(
+						'description' => __( 'The order of the object in relation to other object of its type.' ),
+						'type'        => 'integer',
+						'context'     => array( 'view', 'edit' ),
+					);
+					break;
+
+				case 'post-formats':
+					// Get the native post formats and remove the array keys.
+					$formats = array_values( get_post_format_slugs() );
+
+					$schema['properties']['format'] = array(
+						'description' => __( 'The format for the object.' ),
+						'type'        => 'string',
+						'enum'        => $formats,
+						'context'     => array( 'view', 'edit' ),
+					);
+					break;
+
+				case 'custom-fields':
+					$schema['properties']['meta'] = $this->meta->get_field_schema();
+					break;
+
+			}
+		}
+
+		if ( 'post' === $this->post_type ) {
+			$schema['properties']['sticky'] = array(
+				'description' => __( 'Whether or not the object should be treated as sticky.' ),
+				'type'        => 'boolean',
+				'context'     => array( 'view', 'edit' ),
+			);
+		}
+
+		$schema['properties']['template'] = array(
+			'description' => __( 'The theme file to use to display the object.' ),
+			'type'        => 'string',
+			'context'     => array( 'view', 'edit' ),
+			'arg_options' => array(
+				'validate_callback' => array( $this, 'check_template' ),
+			),
+		);
+
+		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
+		foreach ( $taxonomies as $taxonomy ) {
+			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
+			$schema['properties'][ $base ] = array(
+				/* translators: %s: taxonomy name */
+				'description' => sprintf( __( 'The terms assigned to the object in the %s taxonomy.' ), $taxonomy->name ),
+				'type'        => 'array',
+				'items'       => array(
+					'type'    => 'integer',
+				),
+				'context'     => array( 'view', 'edit' ),
+			);
+		}
+
+		$schema_links = $this->get_schema_links();
+
+		if ( $schema_links ) {
+			$schema['links'] = $schema_links;
+		}
+
+		return $this->add_additional_fields_schema( $schema );
+	}
+
+	/**
+	 * Retrieve Link Description Objects that should be added to the Schema for the posts collection.
+	 *
+	 * @since 4.9.8
+	 *
+	 * @return array
+	 */
+	protected function get_schema_links() {
+
+		$href = rest_url( "{$this->namespace}/{$this->rest_base}/{id}" );
+
+		$links = array();
+
+		if ( 'attachment' !== $this->post_type ) {
+			$links[] = array(
+				'rel'          => 'https://api.w.org/action-publish',
+				'title'        => __( 'The current user can publish this post.' ),
+				'href'         => $href,
+				'targetSchema' => array(
+					'type'       => 'object',
+					'properties' => array(
+						'status' => array(
+							'type' => 'string',
+							'enum' => array( 'publish', 'future' ),
+						),
+					),
+				),
+			);
+		}
+
+		if ( 'post' === $this->post_type ) {
+			$links[] = array(
+				'rel'          => 'https://api.w.org/action-sticky',
+				'title'        => __( 'The current user can sticky this post.' ),
+				'href'         => $href,
+				'targetSchema' => array(
+					'type'       => 'object',
+					'properties' => array(
+						'sticky' => array(
+							'type' => 'boolean',
+						),
+					),
+				),
+			);
+		}
+
+		if ( post_type_supports( $this->post_type, 'author' ) ) {
+			$links[] = array(
+				'rel'          => 'https://api.w.org/action-assign-author',
+				'title'        => __( 'The current user can change the author on this post.' ),
+				'href'         => $href,
+				'targetSchema' => array(
+					'type'       => 'object',
+					'properties' => array(
+						'author' => array(
+							'type' => 'integer',
+						),
+					),
+				),
+			);
+		}
+
+		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
+
+		foreach ( $taxonomies as $tax ) {
+			$tax_base = ! empty( $tax->rest_base ) ? $tax->rest_base : $tax->name;
+
+			/* translators: %s: taxonomy name */
+			$assign_title = sprintf( __( 'The current user can assign terms in the %s taxonomy.' ), $tax->name );
+			/* translators: %s: taxonomy name */
+			$create_title = sprintf( __( 'The current user can create terms in the %s taxonomy.' ), $tax->name );
+
+			$links[] = array(
+				'rel'          => 'https://api.w.org/action-assign-' . $tax_base,
+				'title'        => $assign_title,
+				'href'         => $href,
+				'targetSchema' => array(
+					'type'       => 'object',
+					'properties' => array(
+						$tax_base => array(
+							'type'  => 'array',
+							'items' => array(
+								'type' => 'integer',
+							),
+						),
+					),
+				),
+			);
+
+			$links[] = array(
+				'rel'          => 'https://api.w.org/action-create-' . $tax_base,
+				'title'        => $create_title,
+				'href'         => $href,
+				'targetSchema' => array(
+					'type'       => 'object',
+					'properties' => array(
+						$tax_base => array(
+							'type'  => 'array',
+							'items' => array(
+								'type' => 'integer',
+							),
+						),
+					),
+				),
+			);
+		}
+
+		return $links;
+	}
+
+	/**
+	 * Retrieves the query params for the posts collection.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @return array Collection parameters.
+	 */
+	public function get_collection_params() {
+		$query_params = parent::get_collection_params();
+
+		$query_params['context']['default'] = 'view';
+
+		$query_params['after'] = array(
+			'description'        => __( 'Limit response to posts published after a given ISO8601 compliant date.' ),
+			'type'               => 'string',
+			'format'             => 'date-time',
+		);
+
+		if ( post_type_supports( $this->post_type, 'author' ) ) {
+			$query_params['author'] = array(
+				'description'         => __( 'Limit result set to posts assigned to specific authors.' ),
+				'type'                => 'array',
+				'items'               => array(
+					'type'            => 'integer',
+				),
+				'default'             => array(),
+			);
+			$query_params['author_exclude'] = array(
+				'description'         => __( 'Ensure result set excludes posts assigned to specific authors.' ),
+				'type'                => 'array',
+				'items'               => array(
+					'type'            => 'integer',
+				),
+				'default'             => array(),
+			);
+		}
+
+		$query_params['before'] = array(
+			'description'        => __( 'Limit response to posts published before a given ISO8601 compliant date.' ),
+			'type'               => 'string',
+			'format'             => 'date-time',
+		);
+
+		$query_params['exclude'] = array(
+			'description'        => __( 'Ensure result set excludes specific IDs.' ),
+			'type'               => 'array',
+			'items'              => array(
+				'type'           => 'integer',
+			),
+			'default'            => array(),
+		);
+
+		$query_params['include'] = array(
+			'description'        => __( 'Limit result set to specific IDs.' ),
+			'type'               => 'array',
+			'items'              => array(
+				'type'           => 'integer',
+			),
+			'default'            => array(),
+		);
+
+		if ( 'page' === $this->post_type || post_type_supports( $this->post_type, 'page-attributes' ) ) {
+			$query_params['menu_order'] = array(
+				'description'        => __( 'Limit result set to posts with a specific menu_order value.' ),
+				'type'               => 'integer',
+			);
+		}
+
+		$query_params['offset'] = array(
+			'description'        => __( 'Offset the result set by a specific number of items.' ),
+			'type'               => 'integer',
+		);
+
+		$query_params['order'] = array(
+			'description'        => __( 'Order sort attribute ascending or descending.' ),
+			'type'               => 'string',
+			'default'            => 'desc',
+			'enum'               => array( 'asc', 'desc' ),
+		);
+
+		$query_params['orderby'] = array(
+			'description'        => __( 'Sort collection by object attribute.' ),
+			'type'               => 'string',
+			'default'            => 'date',
+			'enum'               => array(
+				'author',
+				'date',
+				'id',
+				'include',
+				'modified',
+				'parent',
+				'relevance',
+				'slug',
+				'include_slugs',
+				'title',
+			),
+		);
+
+		if ( 'page' === $this->post_type || post_type_supports( $this->post_type, 'page-attributes' ) ) {
+			$query_params['orderby']['enum'][] = 'menu_order';
+		}
+
+		$post_type = get_post_type_object( $this->post_type );
+
+		if ( $post_type->hierarchical || 'attachment' === $this->post_type ) {
+			$query_params['parent'] = array(
+				'description'       => __( 'Limit result set to items with particular parent IDs.' ),
+				'type'              => 'array',
+				'items'             => array(
+					'type'          => 'integer',
+				),
+				'default'           => array(),
+			);
+			$query_params['parent_exclude'] = array(
+				'description'       => __( 'Limit result set to all items except those of a particular parent ID.' ),
+				'type'              => 'array',
+				'items'             => array(
+					'type'          => 'integer',
+				),
+				'default'           => array(),
+			);
+		}
+
+		$query_params['slug'] = array(
+			'description'       => __( 'Limit result set to posts with one or more specific slugs.' ),
+			'type'              => 'array',
+			'items'             => array(
+				'type'          => 'string',
+			),
+			'sanitize_callback' => 'wp_parse_slug_list',
+		);
+
+		$query_params['status'] = array(
+			'default'           => 'publish',
+			'description'       => __( 'Limit result set to posts assigned one or more statuses.' ),
+			'type'              => 'array',
+			'items'             => array(
+				'enum'          => array_merge( array_keys( get_post_stati() ), array( 'any' ) ),
+				'type'          => 'string',
+			),
+			'sanitize_callback' => array( $this, 'sanitize_post_statuses' ),
+		);
+
+		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
+
+		foreach ( $taxonomies as $taxonomy ) {
+			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
+
+			$query_params[ $base ] = array(
+				/* translators: %s: taxonomy name */
+				'description'       => sprintf( __( 'Limit result set to all items that have the specified term assigned in the %s taxonomy.' ), $base ),
+				'type'              => 'array',
+				'items'             => array(
+					'type'          => 'integer',
+				),
+				'default'           => array(),
+			);
+
+			$query_params[ $base . '_exclude' ] = array(
+				/* translators: %s: taxonomy name */
+				'description' => sprintf( __( 'Limit result set to all items except those that have the specified term assigned in the %s taxonomy.' ), $base ),
+				'type'        => 'array',
+				'items'       => array(
+					'type'    => 'integer',
+				),
+				'default'           => array(),
+			);
+		}
+
+		if ( 'post' === $this->post_type ) {
+			$query_params['sticky'] = array(
+				'description'       => __( 'Limit result set to items that are sticky.' ),
+				'type'              => 'boolean',
+			);
+		}
+
+		/**
+		 * Filter collection parameters for the posts controller.
+		 *
+		 * The dynamic part of the filter `$this->post_type` refers to the post
+		 * type slug for the controller.
+		 *
+		 * This filter registers the collection parameter, but does not map the
+		 * collection parameter to an internal WP_Query parameter. Use the
+		 * `rest_{$this->post_type}_query` filter to set WP_Query parameters.
+		 *
+		 * @since 4.7.0
+		 *
+		 * @param array        $query_params JSON Schema-formatted collection parameters.
+		 * @param WP_Post_Type $post_type    Post type object.
+		 */
+		return apply_filters( "rest_{$this->post_type}_collection_params", $query_params, $post_type );
+	}
+
+	/**
+	 * Sanitizes and validates the list of post statuses, including whether the
+	 * user can query private statuses.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param  string|array    $statuses  One or more post statuses.
+	 * @param  WP_REST_Request $request   Full details about the request.
+	 * @param  string          $parameter Additional parameter to pass to validation.
+	 * @return array|WP_Error A list of valid statuses, otherwise WP_Error object.
+	 */
+	public function sanitize_post_statuses( $statuses, $request, $parameter ) {
+		$statuses = wp_parse_slug_list( $statuses );
+
+		// The default status is different in WP_REST_Attachments_Controller
+		$attributes = $request->get_attributes();
+		$default_status = $attributes['args']['status']['default'];
+
+		foreach ( $statuses as $status ) {
+			if ( $status === $default_status ) {
+				continue;
+			}
+
+			$post_type_obj = get_post_type_object( $this->post_type );
+
+			if ( current_user_can( $post_type_obj->cap->edit_posts ) ) {
+				$result = rest_validate_request_arg( $status, $request, $parameter );
+				if ( is_wp_error( $result ) ) {
+					return $result;
+				}
+			} else {
+				return new WP_Error( 'rest_forbidden_status', __( 'Status is forbidden.' ), array( 'status' => rest_authorization_required_code() ) );
+			}
+		}
+
+		return $statuses;
+	}
+}