system/library/mail.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
 * @link        https://www.opencart.com
 */

/**
 * Mail class
 */
class Mail
{
    protected $to;
    protected $from;
    protected $sender;
    protected $reply_to;
    protected $subject;
    protected $text;
    protected $html;
    protected $attachments = array();
    public $parameter;
    private $logger;
    private $adaptorText;
    private $originAdaptor;

    /**
     * Constructor
     *
     * @param    string $adaptor
     * @throws Exception
     */
    public function __construct($adaptor = '')
    {
        if (empty($adaptor)) {
            $adaptor = config('config_mail_engine');
        }

        $this->originAdaptor = $adaptor;
        if ($adaptor == 'mail' || $adaptor == 'smtp') {
            $adaptor = 'SwiftMailer';
        }
        $this->adaptorText = snake_case($adaptor);
        $class = 'Mail\\' . $adaptor;

        if (class_exists($class)) {
            $this->adaptor = new $class();
        } else {
            trigger_error('Error: Could not load mail adaptor ' . $adaptor . '!');
            exit();
        }
        $this->setParams();
        $this->logger = new \Log("mail/{$this->adaptorText}.log");
        $this->logger->write("=====================================================");
        $this->logger->write("Start log for {$this->adaptorText}:");
    }

    private function setParams()
    {