【EC-CUBE 4】自動送信されるメールテンプレートを変更する方法

<?php

/*
 * This file is part of EC-CUBE
 *
 * Copyright(c) EC-CUBE CO.,LTD. All Rights Reserved.
 *
 * http://www.ec-cube.co.jp/
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Customize\Service;

use Doctrine\ORM\NonUniqueResultException;
use Eccube\Common\EccubeConfig;
use Eccube\Entity\BaseInfo;
use Eccube\Entity\Customer;
use Eccube\Entity\MailHistory;
use Eccube\Entity\MailTemplate;
use Eccube\Entity\Order;
use Eccube\Entity\OrderItem;
use Eccube\Entity\Shipping;
use Eccube\Event\EccubeEvents;
use Eccube\Event\EventArgs;
use Eccube\Repository\BaseInfoRepository;
use Eccube\Repository\MailHistoryRepository;
use Eccube\Repository\MailTemplateRepository;
use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
use Symfony\Component\Mailer\MailerInterface;
use Symfony\Component\Mime\Address;
use Symfony\Component\Mime\Email;
use Twig\Error\LoaderError;
use Twig\Error\RuntimeError;
use Twig\Error\SyntaxError;
use Eccube\Service\MailService as BaseMailService;

class MailService extends BaseMailService
{
    public function __construct(
        MailerInterface $mailer,
        MailTemplateRepository $mailTemplateRepository,
        MailHistoryRepository $mailHistoryRepository,
        BaseInfoRepository $baseInfoRepository,
        EventDispatcherInterface $eventDispatcher,
        \Twig\Environment $twig,
        EccubeConfig $eccubeConfig,
    ) {
        parent::__construct(
            $mailer,
            $mailTemplateRepository,
            $mailHistoryRepository,
            $baseInfoRepository,
            $eventDispatcher,
            $twig,
            $eccubeConfig
        );
    }

    /**
     * Send order mail.
     *
     * @param \Eccube\Entity\Order $Order 受注情報
     *
     * @return Email
     */
    public function sendOrderMail(Order $Order)
    {
        log_info('受注メール送信開始');

        // デフォルトのコード
        // $MailTemplate = $this->mailTemplateRepository->find($this->eccubeConfig['eccube_order_mail_template_id']);

        // 修正コード
        $MailTemplate = $this->mailTemplateRepository->find($this->eccubeConfig['my_order_mail_template_id']);

        $body = $this->twig->render($MailTemplate->getFileName(), [
            'Order' => $Order,
        ]);

        $message = (new Email())
            ->subject('['.$this->BaseInfo->getShopName().'] '.$MailTemplate->getMailSubject())
            ->from(new Address($this->BaseInfo->getEmail01(), $this->BaseInfo->getShopName()))
            ->to($this->convertRFCViolatingEmail($Order->getEmail()))
            ->bcc($this->BaseInfo->getEmail01())
            ->replyTo($this->BaseInfo->getEmail03())
            ->returnPath($this->BaseInfo->getEmail04());

        // HTMLテンプレートが存在する場合
        $htmlFileName = $this->getHtmlTemplate($MailTemplate->getFileName());
        if (!is_null($htmlFileName)) {
            $htmlBody = $this->twig->render($htmlFileName, [
                'Order' => $Order,
            ]);

            $message
                ->text($body)
                ->html($htmlBody);
        } else {
            $message->text($body);
        }

        $event = new EventArgs(
            [
                'message' => $message,
                'Order' => $Order,
                'MailTemplate' => $MailTemplate,
                'BaseInfo' => $this->BaseInfo,
            ],
            null
        );
        $this->eventDispatcher->dispatch($event, EccubeEvents::MAIL_ORDER);

        try {
            $this->mailer->send($message);
        } catch (TransportExceptionInterface $e) {
            log_critical($e->getMessage());
        }

        $MailHistory = new MailHistory();
        $MailHistory->setMailSubject($message->getSubject())
            ->setMailBody($message->getTextBody())
            ->setOrder($Order)
            ->setSendDate(new \DateTime());

        // HTML用メールの設定
        $htmlBody = $message->getHtmlBody();
        if (!empty($htmlBody)) {
            $MailHistory->setMailHtmlBody($htmlBody);
        }

        $this->mailHistoryRepository->save($MailHistory);

        log_info('受注メール送信完了');

        return $message;
    }
}

    Eccube\Service\MailService:
        class: Customize\Service\MailService
        arguments:
            - '@mailer.mailer'
            - '@Eccube\Repository\MailTemplateRepository'
            - '@Eccube\Repository\MailHistoryRepository'
            - '@Eccube\Repository\BaseInfoRepository'
            - '@event_dispatcher'
            - '@twig'
            - '@Eccube\Common\EccubeConfig'