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<?php
/**
* REST API: WP_REST_Autosaves_Controller class.
*
* @package WordPress
* @subpackage REST_API
* @since 5.0.0
*/
/**
* Core class used to access autosaves via the REST API.
*
* @since 5.0.0
*
* @see WP_REST_Revisions_Controller
* @see WP_REST_Controller
*/
class WP_REST_Autosaves_Controller extends WP_REST_Revisions_Controller {
/**
* Parent post type.
*
* @since 5.0.0
* @var string
*/
private $parent_post_type;
/**
* Parent post controller.
*
* @since 5.0.0
* @var WP_REST_Controller
*/
private $parent_controller;
/**
* Revision controller.
*
* @since 5.0.0
* @var WP_REST_Revisions_Controller
*/
private $revisions_controller;
/**
* The base of the parent controller's route.
*
* @since 5.0.0
* @var string
*/
private $parent_base;
/**
* Constructor.
*
* @since 5.0.0
*
* @param string $parent_post_type Post type of the parent.
*/
public function __construct( $parent_post_type ) {
$this->parent_post_type = $parent_post_type;
$post_type_object = get_post_type_object( $parent_post_type );
$parent_controller = $post_type_object->get_rest_controller();
if ( ! $parent_controller ) {
$parent_controller = new WP_REST_Posts_Controller( $parent_post_type );
}
$this->parent_controller = $parent_controller;
$revisions_controller = $post_type_object->get_revisions_rest_controller();
if ( ! $revisions_controller ) {
$revisions_controller = new WP_REST_Revisions_Controller( $parent_post_type );
}
$this->revisions_controller = $revisions_controller;
$this->rest_base = 'autosaves';
$this->parent_base = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;
$this->namespace = ! empty( $post_type_object->rest_namespace ) ? $post_type_object->rest_namespace : 'wp/v2';
}
/**
* Registers the routes for autosaves.
*
* @since 5.0.0
*
* @see register_rest_route()
*/
public function register_routes() {
register_rest_route(
$this->namespace,
'/' . $this->parent_base . '/(?P<id>[\d]+)/' . $this->rest_base,
array(
'args' => array(
'parent' => array(
'description' => __( 'The ID for the parent of the autosave.' ),
'type' => 'integer',
),
),
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->parent_controller->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
),
'schema' => array( $this, 'get_public_item_schema' ),
)
);
register_rest_route(
$this->namespace,
'/' . $this->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base . '/(?P<id>[\d]+)',
array(
'args' => array(
'parent' => array(
'description' => __( 'The ID for the parent of the autosave.' ),
'type' => 'integer',
),
'id' => array(
'description' => __( 'The ID for the autosave.' ),
'type' => 'integer',
),
),
array(
'methods' => WP_REST_Server::READABLE,
'callback' => array( $this, 'get_item' ),
'permission_callback' => array( $this->revisions_controller, 'get_item_permissions_check' ),
'args' => array(
'context' => $this->get_context_param( array( 'default' => 'view' ) ),
),
),
'schema' => array( $this, 'get_public_item_schema' ),
)
);
}
/**
* Get the parent post.
*
* @since 5.0.0
*
* @param int $parent_id Supplied ID.
* @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
*/
protected function get_parent( $parent_id ) {
return $this->revisions_controller->get_parent( $parent_id );
}
/**
* Checks if a given request has access to get autosaves.
*
* @since 5.0.0
*
* @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 ) {
$parent = $this->get_parent( $request['id'] );
if ( is_wp_error( $parent ) ) {
return $parent;
}
if ( ! current_user_can( 'edit_post', $parent->ID ) ) {
return new WP_Error(
'rest_cannot_read',
__( 'Sorry, you are not allowed to view autosaves of this post.' ),
array( 'status' => rest_authorization_required_code() )
);
}
return true;
}
/**
* Checks if a given request has access to create an autosave revision.
*
* Autosave revisions inherit permissions from the parent post,
* check if the current user has permission to edit the post.
*
* @since 5.0.0
*
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True if the request has access to create the item, WP_Error object otherwise.
*/
public function create_item_permissions_check( $request ) {
$id = $request->get_param( 'id' );
if ( empty( $id ) ) {
return new WP_Error(
'rest_post_invalid_id',
__( 'Invalid item ID.' ),
array( 'status' => 404 )
);
}
return $this->parent_controller->update_item_permissions_check( $request );
}
/**
* Creates, updates or deletes an autosave revision.
*
* @since 5.0.0
*
* @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 ( ! defined( 'WP_RUN_CORE_TESTS' ) && ! defined( 'DOING_AUTOSAVE' ) ) {
define( 'DOING_AUTOSAVE', true );
}
$post = $this->get_parent( $request['id'] );
if ( is_wp_error( $post ) ) {
return $post;
}
$prepared_post = $this->parent_controller->prepare_item_for_database( $request );
$prepared_post->ID = $post->ID;
$user_id = get_current_user_id();
// We need to check post lock to ensure the original author didn't leave their browser tab open.
if ( ! function_exists( 'wp_check_post_lock' ) ) {
require_once ABSPATH . 'wp-admin/includes/post.php';
}
$post_lock = wp_check_post_lock( $post->ID );
$is_draft = 'draft' === $post->post_status || 'auto-draft' === $post->post_status;
if ( $is_draft && (int) $post->post_author === $user_id && ! $post_lock ) {
/*
* Draft posts for the same author: autosaving updates the post and does not create a revision.
* Convert the post object to an array and add slashes, wp_update_post() expects escaped array.
*/
$autosave_id = wp_update_post( wp_slash( (array) $prepared_post ), true );
} else {
// Non-draft posts: create or update the post autosave. Pass the meta data.
$autosave_id = $this->create_post_autosave( (array) $prepared_post, (array) $request->get_param( 'meta' ) );
}
if ( is_wp_error( $autosave_id ) ) {
return $autosave_id;
}
$autosave = get_post( $autosave_id );
$request->set_param( 'context', 'edit' );
$response = $this->prepare_item_for_response( $autosave, $request );
$response = rest_ensure_response( $response );
return $response;
}
/**
* Get the autosave, if the ID is valid.
*
* @since 5.0.0
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_Post|WP_Error Revision post object if ID is valid, WP_Error otherwise.
*/
public function get_item( $request ) {
$parent_id = (int) $request->get_param( 'parent' );
if ( $parent_id <= 0 ) {
return new WP_Error(
'rest_post_invalid_id',
__( 'Invalid post parent ID.' ),
array( 'status' => 404 )
);
}
$autosave = wp_get_post_autosave( $parent_id );
if ( ! $autosave ) {
return new WP_Error(
'rest_post_no_autosave',
__( 'There is no autosave revision for this post.' ),
array( 'status' => 404 )
);
}
$response = $this->prepare_item_for_response( $autosave, $request );
return $response;
}
/**
* Gets a collection of autosaves using wp_get_post_autosave.
*
* Contains the user's autosave, for empty if it doesn't exist.
*
* @since 5.0.0
*
* @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 ) {
$parent = $this->get_parent( $request['id'] );
if ( is_wp_error( $parent ) ) {
return $parent;
}
$response = array();
$parent_id = $parent->ID;
$revisions = wp_get_post_revisions( $parent_id, array( 'check_enabled' => false ) );
foreach ( $revisions as $revision ) {
if ( str_contains( $revision->post_name, "{$parent_id}-autosave" ) ) {
$data = $this->prepare_item_for_response( $revision, $request );
$response[] = $this->prepare_response_for_collection( $data );
}
}
return rest_ensure_response( $response );
}
/**
* Retrieves the autosave's schema, conforming to JSON Schema.
*
* @since 5.0.0
*
* @return array Item schema data.
*/
public function get_item_schema() {
if ( $this->schema ) {
return $this->add_additional_fields_schema( $this->schema );
}
$schema = $this->revisions_controller->get_item_schema();
$schema['properties']['preview_link'] = array(
'description' => __( 'Preview link for the post.' ),
'type' => 'string',
'format' => 'uri',
'context' => array( 'edit' ),
'readonly' => true,
);
$this->schema = $schema;
return $this->add_additional_fields_schema( $this->schema );
}
/**
* Creates autosave for the specified post.
*
* From wp-admin/post.php.
*
* @since 5.0.0
* @since 6.4.0 The `$meta` parameter was added.
*
* @param array $post_data Associative array containing the post data.
* @param array $meta Associative array containing the post meta data.
* @return mixed The autosave revision ID or WP_Error.
*/
public function create_post_autosave( $post_data, array $meta = array() ) {
$post_id = (int) $post_data['ID'];
$post = get_post( $post_id );
if ( is_wp_error( $post ) ) {
return $post;
}
// Only create an autosave when it is different from the saved post.
$autosave_is_different = false;
$new_autosave = _wp_post_revision_data( $post_data, true );
foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) {
if ( normalize_whitespace( $new_autosave[ $field ] ) !== normalize_whitespace( $post->$field ) ) {
$autosave_is_different = true;
break;
}
}
// Check if meta values have changed.
if ( ! empty( $meta ) ) {
$revisioned_meta_keys = wp_post_revision_meta_keys( $post->post_type );
foreach ( $revisioned_meta_keys as $meta_key ) {
// get_metadata_raw is used to avoid retrieving the default value.
$old_meta = get_metadata_raw( 'post', $post_id, $meta_key, true );
$new_meta = isset( $meta[ $meta_key ] ) ? $meta[ $meta_key ] : '';
if ( $new_meta !== $old_meta ) {
$autosave_is_different = true;
break;
}
}
}
$user_id = get_current_user_id();
// Store one autosave per author. If there is already an autosave, overwrite it.
$old_autosave = wp_get_post_autosave( $post_id, $user_id );
if ( ! $autosave_is_different && $old_autosave ) {
// Nothing to save, return the existing autosave.
return $old_autosave->ID;
}
if ( $old_autosave ) {
$new_autosave['ID'] = $old_autosave->ID;
$new_autosave['post_author'] = $user_id;
/** This filter is documented in wp-admin/post.php */
do_action( 'wp_creating_autosave', $new_autosave );
// wp_update_post() expects escaped array.
$revision_id = wp_update_post( wp_slash( $new_autosave ) );
} else {
// Create the new autosave as a special post revision.
$revision_id = _wp_put_post_revision( $post_data, true );
}
if ( is_wp_error( $revision_id ) || 0 === $revision_id ) {
return $revision_id;
}
// Attached any passed meta values that have revisions enabled.
if ( ! empty( $meta ) ) {
foreach ( $revisioned_meta_keys as $meta_key ) {
if ( isset( $meta[ $meta_key ] ) ) {
update_metadata( 'post', $revision_id, $meta_key, wp_slash( $meta[ $meta_key ] ) );
}
}
}
return $revision_id;
}
/**
* Prepares the revision for the REST response.
*
* @since 5.0.0
* @since 5.9.0 Renamed `$post` to `$item` to match parent class for PHP 8 named parameter support.
*
* @param WP_Post $item Post revision object.
* @param WP_REST_Request $request Request object.
* @return WP_REST_Response Response object.
*/
public function prepare_item_for_response( $item, $request ) {
// Restores the more descriptive, specific name for use within this method.
$post = $item;
$response = $this->revisions_controller->prepare_item_for_response( $post, $request );
$fields = $this->get_fields_for_response( $request );
if ( in_array( 'preview_link', $fields, true ) ) {
$parent_id = wp_is_post_autosave( $post );
$preview_post_id = false === $parent_id ? $post->ID : $parent_id;
$preview_query_args = array();
if ( false !== $parent_id ) {
$preview_query_args['preview_id'] = $parent_id;
$preview_query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $parent_id );
}
$response->data['preview_link'] = get_preview_post_link( $preview_post_id, $preview_query_args );
}
$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
$response->data = $this->add_additional_fields_to_object( $response->data, $request );
$response->data = $this->filter_response_by_context( $response->data, $context );
/**
* Filters a revision returned from the REST API.
*
* Allows modification of the revision right before it is returned.
*
* @since 5.0.0
*
* @param WP_REST_Response $response The response object.
* @param WP_Post $post The original revision object.
* @param WP_REST_Request $request Request used to generate the response.
*/
return apply_filters( 'rest_prepare_autosave', $response, $post, $request );
}
/**
* Retrieves the query params for the autosaves collection.
*
* @since 5.0.0
*
* @return array Collection parameters.
*/
public function get_collection_params() {
return array(
'context' => $this->get_context_param( array( 'default' => 'view' ) ),
);
}
}
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