Currency.php

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<?php
namespace Magento\Framework\Validator;

use Magento\Framework\Setup\Lists;

class Currency
{
    protected $lists;

    public function __construct(Lists $lists)
    {
        $this->lists = $lists;
    }

    public function isValid($currencyCode)
    {
        $isValid = true;
        $allowedCurrencyCodes = array_keys($this->lists->getCurrencyList());

        if (!$currencyCode || !in_array($currencyCode, $allowedCurrencyCodes)) {
            $isValid = false;
        }

        return $isValid;
    }
}