CreditmemoSender.php

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<?php
namespace Magento\Sales\Model\Order\Email\Sender;

use Magento\Payment\Helper\Data as PaymentHelper;
use Magento\Sales\Model\Order;
use Magento\Sales\Model\Order\Creditmemo;
use Magento\Sales\Model\Order\Email\Container\CreditmemoIdentity;
use Magento\Sales\Model\Order\Email\Container\Template;
use Magento\Sales\Model\Order\Email\Sender;
use Magento\Sales\Model\ResourceModel\Order\Creditmemo as CreditmemoResource;
use Magento\Sales\Model\Order\Address\Renderer;
use Magento\Framework\Event\ManagerInterface;
use Magento\Framework\DataObject;

class CreditmemoSender extends Sender
{
    protected $paymentHelper;

    protected $creditmemoResource;

    protected $globalConfig;

    protected $addressRenderer;

    protected $eventManager;

    public function __construct(
        Template $templateContainer,
        CreditmemoIdentity $identityContainer,
        \Magento\Sales\Model\Order\Email\SenderBuilderFactory $senderBuilderFactory,
        \Psr\Log\LoggerInterface $logger,
        Renderer $addressRenderer,
        PaymentHelper $paymentHelper,
        CreditmemoResource $creditmemoResource,
        \Magento\Framework\App\Config\ScopeConfigInterface $globalConfig,
        ManagerInterface $eventManager
    ) {
        parent::__construct($templateContainer, $identityContainer, $senderBuilderFactory, $logger, $addressRenderer);
        $this->paymentHelper = $paymentHelper;
        $this->creditmemoResource = $creditmemoResource;
        $this->globalConfig = $globalConfig;
        $this->addressRenderer = $addressRenderer;
        $this->eventManager = $eventManager;
    }

    public function send(Creditmemo $creditmemo, $forceSyncMode = false)
    {
        $creditmemo->setSendEmail(true);

        if (!$this->globalConfig->getValue('sales_email/general/async_sending') || $forceSyncMode) {
            $order = $creditmemo->getOrder();

            $transport = [
                'order' => $order,
                'creditmemo' => $creditmemo,
                'comment' => $creditmemo->getCustomerNoteNotify() ? $creditmemo->getCustomerNote() : '',
                'billing' => $order->getBillingAddress(),
                'payment_html' => $this->getPaymentHtml($order),
                'store' => $order->getStore(),
                'formattedShippingAddress' => $this->getFormattedShippingAddress($order),
                'formattedBillingAddress' => $this->getFormattedBillingAddress($order),
            ];
            $transportObject = new DataObject($transport);

            $this->eventManager->dispatch(
                'email_creditmemo_set_template_vars_before',
                ['sender' => $this, 'transport' => $transportObject->getData(), 'transportObject' => $transportObject]
            );

            $this->templateContainer->setTemplateVars($transportObject->getData());

            if ($this->checkAndSend($order)) {
                $creditmemo->setEmailSent(true);
                $this->creditmemoResource->saveAttribute($creditmemo, ['send_email', 'email_sent']);
                return true;
            }
        } else {
            $creditmemo->setEmailSent(null);
            $this->creditmemoResource->saveAttribute($creditmemo, 'email_sent');
        }

        $this->creditmemoResource->saveAttribute($creditmemo, 'send_email');

        return false;
    }

    protected function getPaymentHtml(Order $order)
    {
        return $this->paymentHelper->getInfoBlockHtml(
            $order->getPayment(),
            $this->identityContainer->getStore()->getStoreId()
        );
    }
}