Template.php

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<?php
namespace Magento\Newsletter\Model;

class Template extends \Magento\Email\Model\AbstractTemplate
{
    protected $_mail;

    protected $_storeManager;

    protected $_request;

    protected $_filterFactory;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\View\DesignInterface $design,
        \Magento\Framework\Registry $registry,
        \Magento\Store\Model\App\Emulation $appEmulation,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\View\Asset\Repository $assetRepo,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Email\Model\Template\Config $emailConfig,
        \Magento\Email\Model\TemplateFactory $templateFactory,
        \Magento\Framework\Filter\FilterManager $filterManager,
        \Magento\Framework\UrlInterface $urlModel,
        \Magento\Framework\App\RequestInterface $request,
        \Magento\Newsletter\Model\Template\FilterFactory $filterFactory,
        array $data = []
    ) {
        parent::__construct(
            $context,
            $design,
            $registry,
            $appEmulation,
            $storeManager,
            $assetRepo,
            $filesystem,
            $scopeConfig,
            $emailConfig,
            $templateFactory,
            $filterManager,
            $urlModel,
            $data
        );
        $this->_storeManager = $storeManager;
        $this->_request = $request;
        $this->_filterFactory = $filterFactory;
    }

    protected function _construct()
    {
        $this->_init(\Magento\Newsletter\Model\ResourceModel\Template::class);
    }

    public function validate()
    {
        $validators = [
            'template_code' => [\Zend_Filter_Input::ALLOW_EMPTY => false],
            'template_type' => 'Int',
            'template_sender_email' => 'EmailAddress',
            'template_sender_name' => [\Zend_Filter_Input::ALLOW_EMPTY => false],
        ];
        $data = [];
        foreach (array_keys($validators) as $validateField) {
            $data[$validateField] = $this->getDataUsingMethod($validateField);
        }

        $validateInput = new \Zend_Filter_Input([], $validators, $data);
        if (!$validateInput->isValid()) {
            $errorMessages = [];
            foreach ($validateInput->getMessages() as $messages) {
                if (is_array($messages)) {
                    foreach ($messages as $message) {
                        $errorMessages[] = $message;
                    }
                } else {
                    $errorMessages[] = $messages;
                }
            }

            throw new \Magento\Framework\Exception\LocalizedException(__(join("\n", $errorMessages)));
        }
    }

    public function beforeSave()
    {
        $this->validate();
        parent::beforeSave();
        return $this;
    }

    public function getType()
    {
        return $this->getTemplateType();
    }

    public function getProcessedTemplateSubject(array $variables)
    {
        $variables['this'] = $this;

        return $this->getTemplateFilter()
            ->setVariables($variables)
            ->filter($this->getTemplateSubject());
    }

    public function getTemplateText()
    {
        if (!$this->getData('template_text') && !$this->getId()) {
            $this->setData(
                'template_text',
                __(
                    'Follow this link to unsubscribe <!-- This tag is for unsubscribe link  -->' .
                    '<a href="{{var subscriber.getUnsubscriptionLink()}}">{{var subscriber.getUnsubscriptionLink()}}' .
                    '</a>'
                )
            );
        }

        return $this->getData('template_text');
    }

    protected function getFilterFactory()
    {
        return $this->_filterFactory;
    }

    public function isValidForSend()
    {
        return $this->getTemplateSenderName() && $this->getTemplateSenderEmail() && $this->getTemplateSubject();
    }
}