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<?php
/**
* Add support for headless WP.
*
* @since 1.0.15
* @package RankMath
* @subpackage RankMath\Rest
* @author Rank Math <support@rankmath.com>
*/
namespace RankMath\Rest;
use WP_Error;
use WP_REST_Server;
use WP_REST_Request;
use WP_REST_Response;
use WP_REST_Controller;
use RankMath\Helpers\Url;
use RankMath\Helper;
use RankMath\Frontend\Frontend;
defined( 'ABSPATH' ) || exit;
/**
* Front class.
*/
class Headless extends WP_REST_Controller {
/**
* Whether the request is for the homepage.
*
* @var boolean
*/
public $is_home = false;
/**
* Constructor.
*/
public function __construct() {
$this->namespace = \RankMath\Rest\Rest_Helper::BASE;
}
/**
* Registers the routes for the objects of the controller.
*/
public function register_routes() {
if ( ! Helper::get_settings( 'general.headless_support' ) ) {
return;
}
register_rest_route(
$this->namespace,
'/getHead',
[
'methods' => WP_REST_Server::READABLE,
'callback' => [ $this, 'get_head' ],
'permission_callback' => '__return_true',
'args' => [
'url' => [
'type' => 'string',
'required' => true,
'description' => esc_html__( 'URL to get HTML tags for.', 'rank-math' ),
'validate_callback' => [ $this, 'is_valid_url' ],
],
],
]
);
}
/**
* Get all tags that go in the <head>. Useful for headless WP installations.
*
* @param WP_REST_Request $request Request object, should include the "url" parameter.
*
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function get_head( WP_REST_Request $request ) {
$resp = new WP_REST_Response();
$url = $request->get_param( 'url' );
$html = $this->get_html_head( $url );
$resp->set_status( 200 );
$resp->set_data(
[
'success' => true,
'head' => $html,
]
);
return $resp;
}
/**
* Return Rank Math head HTML output for the given URL.
*
* @param string $url Request URL.
*
* @return string
*/
private function get_html_head( $url ) {
$this->setup_post_head( $url );
ob_start();
do_action( 'wp' );
do_action( 'rank_math/head' );
return ob_get_clean();
}
/**
* Prepare head output for a URL.
*
* @param string $url Request URL.
*
* @return void
*/
private function setup_post_head( $url ) {
// Setup WordPress.
$_SERVER['REQUEST_URI'] = $this->generate_request_uri( $url );
remove_all_actions( 'wp' );
remove_all_actions( 'parse_request' );
wp();
if ( $this->is_home ) {
$GLOBALS['wp_query']->is_home = true;
}
remove_filter( 'option_rewrite_rules', [ $this, 'fix_query_notice' ] );
header( 'Content-Type: application/json; charset=UTF-8' );
// Setup Rank Math.
rank_math()->variables->setup();
rank_math()->manager->load_modules();
new Frontend();
}
/**
* Generate $_SERVER['REQUEST_URI'] value based on input URL.
*
* @param string $url Input URL.
* @return string
*/
public function generate_request_uri( $url ) {
$quoted = preg_quote( rtrim( home_url(), '/' ), '/' );
$request_uri = preg_replace( sprintf( '/^%s/i', $quoted ), '', rtrim( $url, '/' ) );
if ( empty( $request_uri ) ) {
$request_uri = '/';
$this->is_home = true;
$front_page_id = get_option( 'page_on_front' );
if ( 'page' === get_option( 'show_on_front' ) && $front_page_id ) {
$this->is_home = false;
$request_uri = get_post_field( 'post_name', $front_page_id );
}
add_filter( 'option_rewrite_rules', [ $this, 'fix_query_notice' ] );
}
return $request_uri;
}
/**
* Filter rewrite_rules to avoid a PHP notice.
*
* @param array $rules Original rules.
* @return array
*/
public function fix_query_notice( $rules ) {
if ( ! is_array( $rules ) || isset( $rules['$'] ) ) {
return $rules;
}
global $wp_rewrite;
$rules['$'] = $wp_rewrite->index;
return $rules;
}
/**
* Check if provided URL is valid and internal.
*
* @param string $url URL.
*
* @return boolean
*/
public function is_valid_url( $url ) {
$url = preg_replace_callback(
'/[^\x20-\x7f]/',
function( $match ) {
return rawurlencode( $match[0] );
},
$url
);
return Url::is_url( $url ) && ! Url::is_external( $url );
}
}
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