NotProtectedExtension.php

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<?php
namespace Magento\MediaStorage\Model\File\Validator;

class NotProtectedExtension extends \Zend_Validate_Abstract
{
    const PROTECTED_EXTENSION = 'protectedExtension';

    const XML_PATH_PROTECTED_FILE_EXTENSIONS = 'general/file/protected_extensions';

    protected $_value;

    protected $_protectedFileExtensions = [];

    protected $_scopeConfig;

    public function __construct(\Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig)
    {
        $this->_scopeConfig = $scopeConfig;
        $this->_initMessageTemplates();
        $this->_initProtectedFileExtensions();
    }

    protected function _initMessageTemplates()
    {
        if (!$this->_messageTemplates) {
            $this->_messageTemplates = [
                self::PROTECTED_EXTENSION => __('File with an extension "%value%" is protected and cannot be uploaded'),
            ];
        }
        return $this;
    }

    protected function _initProtectedFileExtensions()
    {
        if (!$this->_protectedFileExtensions) {
            $extensions = $this->getProtectedFileExtensions();
            if (is_string($extensions)) {
                $extensions = explode(',', $extensions);
            }
            foreach ($extensions as &$ext) {
                $ext = strtolower(trim($ext));
            }
            $this->_protectedFileExtensions = (array)$extensions;
        }
        return $this;
    }

    public function getProtectedFileExtensions($store = null)
    {
        return $this->_scopeConfig->getValue(
            self::XML_PATH_PROTECTED_FILE_EXTENSIONS,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
            $store
        );
    }

    public function isValid($value)
    {
        $value = strtolower(trim($value));
        $this->_setValue($value);

        if (in_array($this->_value, $this->_protectedFileExtensions)) {
            $this->_error(self::PROTECTED_EXTENSION, $this->_value);
            return false;
        }

        return true;
    }
}