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<?php
namespace Automattic\WooCommerce\StoreApi\Utilities;
/**
* Pagination class.
*/
class Pagination {
/**
* Add pagination headers to a response object.
*
* @param \WP_REST_Response $response Reference to the response object.
* @param \WP_REST_Request $request The request object.
* @param int $total_items Total items found.
* @param int $total_pages Total pages found.
* @return \WP_REST_Response
*/
public function add_headers( $response, $request, $total_items, $total_pages ) {
$response->header( 'X-WP-Total', $total_items );
$response->header( 'X-WP-TotalPages', $total_pages );
$current_page = $this->get_current_page( $request );
$link_base = $this->get_link_base( $request );
if ( $current_page > 1 ) {
$previous_page = $current_page - 1;
if ( $previous_page > $total_pages ) {
$previous_page = $total_pages;
}
$this->add_page_link( $response, 'prev', $previous_page, $link_base );
}
if ( $total_pages > $current_page ) {
$this->add_page_link( $response, 'next', ( $current_page + 1 ), $link_base );
}
return $response;
}
/**
* Get current page.
*
* @param \WP_REST_Request $request The request object.
* @return int Get the page from the request object.
*/
protected function get_current_page( $request ) {
return (int) $request->get_param( 'page' );
}
/**
* Get base for links from the request object.
*
* @param \WP_REST_Request $request The request object.
* @return string
*/
protected function get_link_base( $request ) {
return esc_url( add_query_arg( $request->get_query_params(), rest_url( $request->get_route() ) ) );
}
/**
* Add a page link.
*
* @param \WP_REST_Response $response Reference to the response object.
* @param string $name Page link name. e.g. prev.
* @param int $page Page number.
* @param string $link_base Base URL.
*/
protected function add_page_link( &$response, $name, $page, $link_base ) {
$response->link_header( $name, add_query_arg( 'page', $page, $link_base ) );
}
}