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<?php

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/**

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* REST API: WP_REST_Autosaves_Controller class.

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* @package WordPress

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* @subpackage REST_API

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* @since 5.0.0

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/**

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* Core class used to access autosaves via the REST API.

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* @since 5.0.0

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* @see WP_REST_Revisions_Controller

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* @see WP_REST_Controller

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class WP_REST_Autosaves_Controller extends WP_REST_Revisions_Controller {

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/**

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* Parent post type.

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* @since 5.0.0

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* @var string

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private $parent_post_type;

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/**

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* Parent post controller.

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* @since 5.0.0

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* @var WP_REST_Controller

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private $parent_controller;

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/**

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* Revision controller.

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* @since 5.0.0

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* @var WP_REST_Revisions_Controller

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private $revisions_controller;

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/**

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* The base of the parent controller's route.

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* @since 5.0.0

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* @var string

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private $parent_base;

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/**

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* Constructor.

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* @since 5.0.0

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* @param string $parent_post_type Post type of the parent.

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public function __construct( $parent_post_type ) {

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$this->parent_post_type = $parent_post_type;

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$post_type_object = get_post_type_object( $parent_post_type );

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$parent_controller = $post_type_object->get_rest_controller();

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if ( ! $parent_controller ) {

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$parent_controller = new WP_REST_Posts_Controller( $parent_post_type );

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}

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$this->parent_controller = $parent_controller;

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$revisions_controller = $post_type_object->get_revisions_rest_controller();

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if ( ! $revisions_controller ) {

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$revisions_controller = new WP_REST_Revisions_Controller( $parent_post_type );

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}

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$this->revisions_controller = $revisions_controller;

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$this->rest_base = 'autosaves';

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$this->parent_base = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;

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$this->namespace = ! empty( $post_type_object->rest_namespace ) ? $post_type_object->rest_namespace : 'wp/v2';

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}

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/**

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* Registers the routes for autosaves.

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* @since 5.0.0

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* @see register_rest_route()

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public function register_routes() {

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register_rest_route(

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$this->namespace,

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'/' . $this->parent_base . '/(?P<id>[\d]+)/' . $this->rest_base,

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array(

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'args' => array(

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'parent' => array(

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'description' => __( 'The ID for the parent of the autosave.' ),

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'type' => 'integer',

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array(

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'methods' => WP_REST_Server::READABLE,

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'callback' => array( $this, 'get_items' ),

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'permission_callback' => array( $this, 'get_items_permissions_check' ),

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'args' => $this->get_collection_params(),

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array(

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'methods' => WP_REST_Server::CREATABLE,

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'callback' => array( $this, 'create_item' ),

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'permission_callback' => array( $this, 'create_item_permissions_check' ),

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'args' => $this->parent_controller->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),

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'schema' => array( $this, 'get_public_item_schema' ),

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)

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);

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register_rest_route(

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$this->namespace,

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'/' . $this->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base . '/(?P<id>[\d]+)',

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array(

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'args' => array(

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'parent' => array(

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'description' => __( 'The ID for the parent of the autosave.' ),

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'type' => 'integer',

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'id' => array(

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'description' => __( 'The ID for the autosave.' ),

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'type' => 'integer',

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array(

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'methods' => WP_REST_Server::READABLE,

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'callback' => array( $this, 'get_item' ),

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'permission_callback' => array( $this->revisions_controller, 'get_item_permissions_check' ),

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'args' => array(

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'context' => $this->get_context_param( array( 'default' => 'view' ) ),

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'schema' => array( $this, 'get_public_item_schema' ),

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)

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);

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}

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/**

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* Get the parent post.

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* @since 5.0.0

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* @param int $parent_id Supplied ID.

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* @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.

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protected function get_parent( $parent_id ) {

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return $this->revisions_controller->get_parent( $parent_id );

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}

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/**

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* Checks if a given request has access to get autosaves.

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* @since 5.0.0

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* @param WP_REST_Request $request Full details about the request.

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* @return true|WP_Error True if the request has read access, WP_Error object otherwise.

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public function get_items_permissions_check( $request ) {

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$parent = $this->get_parent( $request['id'] );

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if ( is_wp_error( $parent ) ) {

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return $parent;

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}

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if ( ! current_user_can( 'edit_post', $parent->ID ) ) {

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return new WP_Error(

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'rest_cannot_read',

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__( 'Sorry, you are not allowed to view autosaves of this post.' ),

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array( 'status' => rest_authorization_required_code() )

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);

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}

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return true;

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}

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/**

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* Checks if a given request has access to create an autosave revision.

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* Autosave revisions inherit permissions from the parent post,

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* check if the current user has permission to edit the post.

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* @since 5.0.0

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* @param WP_REST_Request $request Full details about the request.

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* @return true|WP_Error True if the request has access to create the item, WP_Error object otherwise.

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public function create_item_permissions_check( $request ) {

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$id = $request->get_param( 'id' );

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if ( empty( $id ) ) {

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return new WP_Error(

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'rest_post_invalid_id',

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__( 'Invalid item ID.' ),

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array( 'status' => 404 )

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);

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}

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return $this->parent_controller->update_item_permissions_check( $request );

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}

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/**

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* Creates, updates or deletes an autosave revision.

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* @since 5.0.0

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* @param WP_REST_Request $request Full details about the request.

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* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.

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public function create_item( $request ) {

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if ( ! defined( 'WP_RUN_CORE_TESTS' ) && ! defined( 'DOING_AUTOSAVE' ) ) {

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define( 'DOING_AUTOSAVE', true );

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}

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$post = $this->get_parent( $request['id'] );

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if ( is_wp_error( $post ) ) {

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return $post;

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}

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$prepared_post = $this->parent_controller->prepare_item_for_database( $request );

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$prepared_post->ID = $post->ID;

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$user_id = get_current_user_id();

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// We need to check post lock to ensure the original author didn't leave their browser tab open.

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if ( ! function_exists( 'wp_check_post_lock' ) ) {

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require_once ABSPATH . 'wp-admin/includes/post.php';

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}

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$post_lock = wp_check_post_lock( $post->ID );

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$is_draft = 'draft' === $post->post_status || 'auto-draft' === $post->post_status;

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if ( $is_draft && (int) $post->post_author === $user_id && ! $post_lock ) {

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* Draft posts for the same author: autosaving updates the post and does not create a revision.

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* Convert the post object to an array and add slashes, wp_update_post() expects escaped array.

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$autosave_id = wp_update_post( wp_slash( (array) $prepared_post ), true );

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} else {

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// Non-draft posts: create or update the post autosave. Pass the meta data.

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$autosave_id = $this->create_post_autosave( (array) $prepared_post, (array) $request->get_param( 'meta' ) );

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}

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if ( is_wp_error( $autosave_id ) ) {

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return $autosave_id;

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}

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$autosave = get_post( $autosave_id );

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$request->set_param( 'context', 'edit' );

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$response = $this->prepare_item_for_response( $autosave, $request );

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$response = rest_ensure_response( $response );

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return $response;

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}

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/**

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* Get the autosave, if the ID is valid.

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* @since 5.0.0

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* @param WP_REST_Request $request Full details about the request.

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* @return WP_Post|WP_Error Revision post object if ID is valid, WP_Error otherwise.

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public function get_item( $request ) {

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$parent_id = (int) $request->get_param( 'parent' );

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if ( $parent_id <= 0 ) {

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return new WP_Error(

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'rest_post_invalid_id',

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__( 'Invalid post parent ID.' ),

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array( 'status' => 404 )

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);

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}

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$autosave = wp_get_post_autosave( $parent_id );

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if ( ! $autosave ) {

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return new WP_Error(

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'rest_post_no_autosave',

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__( 'There is no autosave revision for this post.' ),

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array( 'status' => 404 )

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);

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}

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$response = $this->prepare_item_for_response( $autosave, $request );

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return $response;

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}

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/**

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* Gets a collection of autosaves using wp_get_post_autosave.

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* Contains the user's autosave, for empty if it doesn't exist.

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* @since 5.0.0

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* @param WP_REST_Request $request Full details about the request.

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* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.

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public function get_items( $request ) {

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$parent = $this->get_parent( $request['id'] );

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if ( is_wp_error( $parent ) ) {

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return $parent;

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}

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$response = array();

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$parent_id = $parent->ID;

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$revisions = wp_get_post_revisions( $parent_id, array( 'check_enabled' => false ) );

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foreach ( $revisions as $revision ) {

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if ( str_contains( $revision->post_name, "{$parent_id}-autosave" ) ) {

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$data = $this->prepare_item_for_response( $revision, $request );

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$response[] = $this->prepare_response_for_collection( $data );

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}

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}

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return rest_ensure_response( $response );

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}

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/**

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* Retrieves the autosave's schema, conforming to JSON Schema.

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* @since 5.0.0

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* @return array Item schema data.

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public function get_item_schema() {

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if ( $this->schema ) {

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return $this->add_additional_fields_schema( $this->schema );

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}

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$schema = $this->revisions_controller->get_item_schema();

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$schema['properties']['preview_link'] = array(

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'description' => __( 'Preview link for the post.' ),

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'type' => 'string',

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'format' => 'uri',

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'context' => array( 'edit' ),

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'readonly' => true,

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);

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$this->schema = $schema;

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return $this->add_additional_fields_schema( $this->schema );

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}

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/**

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* Creates autosave for the specified post.

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* From wp-admin/post.php.

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* @since 5.0.0

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* @since 6.4.0 The `$meta` parameter was added.

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* @param array $post_data Associative array containing the post data.

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* @param array $meta Associative array containing the post meta data.

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* @return mixed The autosave revision ID or WP_Error.

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public function create_post_autosave( $post_data, array $meta = array() ) {

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$post_id = (int) $post_data['ID'];

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$post = get_post( $post_id );

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if ( is_wp_error( $post ) ) {

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return $post;

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}

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// Only create an autosave when it is different from the saved post.

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$autosave_is_different = false;

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$new_autosave = _wp_post_revision_data( $post_data, true );

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foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) {

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if ( normalize_whitespace( $new_autosave[ $field ] ) !== normalize_whitespace( $post->$field ) ) {

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$autosave_is_different = true;

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break;

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}

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}

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// Check if meta values have changed.

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if ( ! empty( $meta ) ) {

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$revisioned_meta_keys = wp_post_revision_meta_keys( $post->post_type );

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foreach ( $revisioned_meta_keys as $meta_key ) {

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// get_metadata_raw is used to avoid retrieving the default value.

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$old_meta = get_metadata_raw( 'post', $post_id, $meta_key, true );

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$new_meta = isset( $meta[ $meta_key ] ) ? $meta[ $meta_key ] : '';

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if ( $new_meta !== $old_meta ) {

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$autosave_is_different = true;

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break;

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}

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}

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}

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$user_id = get_current_user_id();

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// Store one autosave per author. If there is already an autosave, overwrite it.

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$old_autosave = wp_get_post_autosave( $post_id, $user_id );

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if ( ! $autosave_is_different && $old_autosave ) {

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// Nothing to save, return the existing autosave.

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return $old_autosave->ID;

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}

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if ( $old_autosave ) {

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$new_autosave['ID'] = $old_autosave->ID;

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$new_autosave['post_author'] = $user_id;

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/** This filter is documented in wp-admin/post.php */

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do_action( 'wp_creating_autosave', $new_autosave );

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// wp_update_post() expects escaped array.

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$revision_id = wp_update_post( wp_slash( $new_autosave ) );

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} else {

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// Create the new autosave as a special post revision.

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$revision_id = _wp_put_post_revision( $post_data, true );

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}

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if ( is_wp_error( $revision_id ) || 0 === $revision_id ) {

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return $revision_id;

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}

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// Attached any passed meta values that have revisions enabled.

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if ( ! empty( $meta ) ) {

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foreach ( $revisioned_meta_keys as $meta_key ) {

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if ( isset( $meta[ $meta_key ] ) ) {

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update_metadata( 'post', $revision_id, $meta_key, wp_slash( $meta[ $meta_key ] ) );

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}

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}

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}

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return $revision_id;

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}

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/**

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* Prepares the revision for the REST response.

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* @since 5.0.0

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* @since 5.9.0 Renamed `$post` to `$item` to match parent class for PHP 8 named parameter support.

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* @param WP_Post $item Post revision object.

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* @param WP_REST_Request $request Request object.

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* @return WP_REST_Response Response object.

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public function prepare_item_for_response( $item, $request ) {

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// Restores the more descriptive, specific name for use within this method.

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$post = $item;

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$response = $this->revisions_controller->prepare_item_for_response( $post, $request );

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$fields = $this->get_fields_for_response( $request );

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if ( in_array( 'preview_link', $fields, true ) ) {

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$parent_id = wp_is_post_autosave( $post );

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$preview_post_id = false === $parent_id ? $post->ID : $parent_id;

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$preview_query_args = array();

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if ( false !== $parent_id ) {

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$preview_query_args['preview_id'] = $parent_id;

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$preview_query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $parent_id );

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}

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$response->data['preview_link'] = get_preview_post_link( $preview_post_id, $preview_query_args );

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}

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$context = ! empty( $request['context'] ) ? $request['context'] : 'view';

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$response->data = $this->add_additional_fields_to_object( $response->data, $request );

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$response->data = $this->filter_response_by_context( $response->data, $context );

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/**

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* Filters a revision returned from the REST API.

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* Allows modification of the revision right before it is returned.

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* @since 5.0.0

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* @param WP_REST_Response $response The response object.

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* @param WP_Post $post The original revision object.

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* @param WP_REST_Request $request Request used to generate the response.

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return apply_filters( 'rest_prepare_autosave', $response, $post, $request );

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}

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/**

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* Retrieves the query params for the autosaves collection.

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* @since 5.0.0

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* @return array Collection parameters.

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public function get_collection_params() {

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return array(

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'context' => $this->get_context_param( array( 'default' => 'view' ) ),

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);

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}

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}

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