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✏️ Editing: referrer.php

<?php
/**
 * Filters manager class
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

/**
 * Define Jet_Smart_Filters_Referrer_Manager class
 */
class Jet_Smart_Filters_Referrer_Manager {

/**
	 * Available types:
	 * front - send request to the initial page with ?jsf_ajax=1
	 * ajax - send request to admin-ajax.php with referrer data in the request
	 */
	public $referrer_type = 'default';

/**
	 * Query varaibale key to define front referrer request
	 */
	public static $front_query_key = 'jsf_ajax';

/**
	 * Query varaibale key to define referrer method while request and not on the settings
	 *
	 * @var string
	 */
	public static $force_referrer_key = 'jsf_force_referrer';

/**
	 * Query varaibale key to define referrer firing sequence - early or late
	 *
	 * @var string
	 */
	public static $sequence_referrer_key = 'jsf_referrer_sequence';

/**
	 * Constructor for the class
	 */
	public function __construct() {

if ( ! empty( $_GET[ self::$force_referrer_key ] ) ) {
			$this->referrer_type = sanitize_key( $_GET[ self::$force_referrer_key ] );
		} else {
			$this->referrer_type = jet_smart_filters()->settings->get( 'ajax_request_types' );
		}

if ( 'default' === $this->referrer_type || ! $this->referrer_type ) {

if ( jet_smart_filters()->query->is_ajax_filter() ) {
				$this->define_filters_request_constant();
			}

return;
		}

add_filter( 'jet-smart-filters/filters/localized-data', array( $this, 'set_referrer_settings' ) );

if ( 'referrer' === $this->referrer_type ) {
			add_action( 'jet-smart-filters/render/ajax/before', array( $this, 'setup_ajax_referrer' ) );
		}

if ( 'self' === $this->referrer_type && ! empty( $_GET[ self::$front_query_key ] ) ) {

$sequence = ! empty( $_GET[ self::$sequence_referrer_key ] ) ? sanitize_key( $_GET[ self::$sequence_referrer_key ] ) : 'early';

if ( ! in_array( $sequence, array( 'early', 'late' ) ) ) {
				$sequence = 'early';
			}

$hook = 'parse_request';
			$priority = 10;

if ( 'late' === $sequence ) {
				$hook = 'wp';
				$priority = 99999;
			}

/**
			 * Only 'parse_request' and 'wp' hooks are available for the front referrer
			 * because both og them accepts the WP object as a parameter
			 */
			add_action( $hook, array( $this, 'setup_front_referrer' ), $priority );
		}

}

public function define_filters_request_constant() {
		define( 'JET_SMART_FILTERS_DOING_REQUEST', true );
	}

public function set_referrer_settings( $data ) {

if ( 'referrer' === $this->referrer_type ) {
			$data['referrer_data'] = $this->get_referrer_data();
		}

if ( 'self' === $this->referrer_type ) {
			$data['referrer_url'] = self::get_referrer_url();
		}

return $data;
	}

/**
	 * Setup front referrer
	 */
	public function setup_front_referrer( $wp ) {

$this->define_filters_request_constant();

do_action( 'jet-smart-filters/referrer/self/before' );

$wp->query_posts();
		$wp->register_globals();

if ( apply_filters( 'jet-smart-filters/referrer/front/define-ajax', false ) ) {
			define( 'DOING_AJAX', true );
		}

jet_smart_filters()->query->set_is_ajax_filter();

do_action( 'jet-smart-filters/referrer/request' );

do_action( 'wp_ajax_jet_smart_filters' );
		do_action( 'wp_ajax_nopriv_jet_smart_filters' );

die();
	}

/**
	 * Setup data by referrer URL string
	 */
	public function setup_ajax_referrer() {

if ( empty( $_REQUEST['referrer'] ) ) {
			return;
		}

$referrer = $_REQUEST['referrer'];

if ( ! is_array( $referrer ) ) {
			return;
		}

$this->define_filters_request_constant();

global $wp;

$map = array(
			'uri'  => 'REQUEST_URI',
			'info' => 'PATH_INFO',
			'self' => 'PHP_SELF',
		);

$temp = array();

$uri      = ! empty( $referrer['uri'] ) ? $referrer['uri'] : false;
		$uri_data = explode( '?', $uri );

if ( ! empty( $uri_data[1] ) ) {
			parse_str( $uri_data[1], $request );

foreach ( $request as $key => $value ) {
				$_GET[ $key ]     = $value;
				$_REQUEST[ $key ] = $value;
			}
		}

foreach ( $map as $request_key => $server_key ) {
			if ( isset( $referrer[ $request_key ] ) ) {
				$temp[ $server_key ] = isset( $_SERVER[ $server_key ] ) ? $_SERVER[ $server_key ] : '';
				$_SERVER[ $server_key ] = $referrer[ $request_key ];
			}
		}

global $current_screen;

$current_screen = WP_Screen::get( 'front' );

do_action( 'jet-smart-filters/referrer/ajax/before' );

$wp->parse_request();
		$wp->query_posts();
		$wp->register_globals();

foreach ( $temp as $key => $value) {
			$_SERVER[ $key ] = $value;
		}

do_action( 'jet-smart-filters/referrer/request' );
	}

/**
	 * Returns referrer URL
	 */
	public function get_referrer_data() {

return array(
			'uri'  => ! empty( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : null,
			'info' => ! empty( $_SERVER['PATH_INFO'] ) ? $_SERVER['PATH_INFO'] : null,
			'self' => ! empty( $_SERVER['PHP_SELF'] ) ? $_SERVER['PHP_SELF'] : null,
		);
	}

/**
	 * Returns referrer URL
	 */
	public static function get_referrer_url() {
		return add_query_arg( array( self::$front_query_key => 1 ) );
	}
}

MR SKB