system/library/url.php

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<?php
/**
 * @package   OpenCart
 * @author    Daniel Kerr
 * @copyright Copyright (c) 2005 - 2017, OpenCart, Ltd. (https://www.opencart.com/)
 * @license   https://opensource.org/licenses/GPL-3.0
 * @author    Daniel Kerr
 * @see       https://www.opencart.com
 */

/**
 * URL class.
 */
class Url {
	/** @var string */
	private $url;
	/** @var Controller[] */
	private $rewrite = array();

	/**
	 * Constructor.
	 *
	 * @param string $url
	 * @param string $ssl Unused
	 */
	public function __construct($url, $ssl = '') {
		$this->url = $url;
	}

	/**
	 *
	 *
	 * @param Controller $rewrite
	 *
	 * @return void
	 */
	public function addRewrite($rewrite) {
		$this->rewrite[] = $rewrite;
	}

	/**
	 *
	 *
	 * @param string          $route
	 * @param string|string[] $args
	 *
	 * @return string
	 */
	public function link($route, $args = '', $auto_admin_token = true) {
		$url = $this->url . 'index.php?route=' . (string)$route;

        // Add user_token to admin link if it's not passed in
        if ($auto_admin_token && is_admin() && $user_token = array_get(session()->data, 'user_token')) {
            if (is_array($args) && !in_array('user_token', $args)) {
                $args['user_token'] = $user_token;
            } else if (!str_contains($args, 'user_token')) {
                $args .= '&user_token=' . $user_token;
            }
        }