WP_REST_Posts_Controller::handle_status_param( string $post_status, WP_Post_Type $post_type )
Determines validity and normalizes the given status parameter.
Parameters
- $post_status
-  (string) (Required) Post status. 
- $post_type
-  (WP_Post_Type) (Required) Post type. 
Return
(string|WP_Error) Post status or WP_Error if lacking the proper permission.
Source
File: wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
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;
	}  Changelog
| Version | Description | 
|---|---|
| 4.7.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/classes/wp_rest_posts_controller/handle_status_param