Cert.php

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<?php
namespace Magento\Paypal\Model\System\Config\Backend;

use Magento\Framework\Filesystem;
use Magento\Framework\Filesystem\DirectoryList;

class Cert extends \Magento\Framework\App\Config\Value
{
    protected $_certFactory;

    protected $_encryptor;

    protected $_tmpDirectory;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Paypal\Model\CertFactory $certFactory,
        \Magento\Framework\Encryption\EncryptorInterface $encryptor,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_certFactory = $certFactory;
        $this->_encryptor = $encryptor;
        $this->_tmpDirectory = $filesystem->getDirectoryRead(DirectoryList::SYS_TMP);
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }

    public function beforeSave()
    {
        $value = $this->getValue();

        if (!empty($value['value'])) {
            $this->setValue($value['value']);
        }

        if (is_array($value) && !empty($value['delete'])) {
            $this->setValue('');
            $this->_certFactory->create()->loadByWebsite($this->getScopeId())->delete();
        }

        if (empty($value['tmp_name'])) {
            return $this;
        }

        $tmpPath = $this->_tmpDirectory->getRelativePath($value['tmp_name']);

        if ($tmpPath && $this->_tmpDirectory->isExist($tmpPath)) {
            if (!$this->_tmpDirectory->stat($tmpPath)['size']) {
                throw new \Magento\Framework\Exception\LocalizedException(__('The PayPal certificate file is empty.'));
            }
            $this->setValue($value['name']);
            $content = $this->_encryptor->encrypt($this->_tmpDirectory->readFile($tmpPath));
            $this->_certFactory->create()->loadByWebsite($this->getScopeId())->setContent($content)->save();
        }
        return $this;
    }

    public function afterDelete()
    {
        $this->_certFactory->create()->loadByWebsite($this->getScopeId())->delete();
        return $this;
    }
}