check_read_active_theme_permission example

    public function get_items_permissions_check( $request ) {
        if ( current_user_can( 'switch_themes' ) || current_user_can( 'manage_network_themes' ) ) {
            return true;
        }

        $registered = $this->get_collection_params();
        if ( isset( $registered['status'], $request['status'] ) && is_array( $request['status'] ) && array( 'active' ) === $request['status'] ) {
            return $this->check_read_active_theme_permission();
        }

        return new WP_Error(
            'rest_cannot_view_themes',
            __( 'Sorry, you are not allowed to view themes.' ),
            array( 'status' => rest_authorization_required_code() )
        );
    }

    /** * Checks if a given request has access to read the theme. * * @since 5.7.0 * * @param WP_REST_Request $request Full details about the request. * @return bool|WP_Error True if the request has read access for the item, otherwise WP_Error object. */