Cert.php

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<?php
namespace Magento\Paypal\Model;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Filesystem\Directory\WriteInterface;

class Cert extends \Magento\Framework\Model\AbstractModel
{
    const BASEPATH_PAYPAL_CERT = 'cert/paypal/';

    protected $varDirectory;

    protected $encryptor;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Framework\Encryption\EncryptorInterface $encryptor,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->varDirectory = $filesystem->getDirectoryWrite(DirectoryList::VAR_DIR);
        $this->encryptor = $encryptor;
        parent::__construct($context, $registry, $resource, $resourceCollection, $data);
    }

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

    public function loadByWebsite($websiteId, $strictLoad = true)
    {
        $this->setWebsiteId($websiteId);
        $this->_getResource()->loadByWebsite($this, $strictLoad);
        return $this;
    }

    public function getCertPath()
    {
        if (!$this->getContent()) {
            throw new \Magento\Framework\Exception\LocalizedException(__('The PayPal certificate does not exist.'));
        }

        $certFileName = sprintf('cert_%s_%s.pem', $this->getWebsiteId(), strtotime($this->getUpdatedAt()));
        $certFile = self::BASEPATH_PAYPAL_CERT . $certFileName;

        if (!$this->varDirectory->isExist($certFile)) {
            $this->_createCertFile($certFile);
        }
        return $this->varDirectory->getAbsolutePath($certFile);
    }

    protected function _createCertFile($file)
    {
        if ($this->varDirectory->isDirectory(self::BASEPATH_PAYPAL_CERT)) {
            $this->_removeOutdatedCertFile();
        }
        $this->varDirectory->writeFile($file, $this->encryptor->decrypt($this->getContent()));
    }

    protected function _removeOutdatedCertFile()
    {
        $pattern = sprintf('cert_%s*', $this->getWebsiteId());
        $entries = $this->varDirectory->search($pattern, self::BASEPATH_PAYPAL_CERT);
        foreach ($entries as $entry) {
            $this->varDirectory->delete($entry);
        }
    }

    public function afterDelete()
    {
        $this->_removeOutdatedCertFile();
        return $this;
    }
}