XmlValidator.php

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<?php
namespace Magento\Dhl\Model\Validator;

use Magento\Sales\Exception\DocumentValidationException;

class XmlValidator
{
    private $xmlSecurity;

    private $errorProcessor;

    public function __construct(
        \Magento\Framework\Xml\Security $xmlSecurity,
        ResponseErrorProcessor $errorProcessor
    ) {
        $this->xmlSecurity = $xmlSecurity;
        $this->errorProcessor = $errorProcessor;
    }

    public function validate($xmlResponse, $isShippingLabel = false)
    {
        if (strlen(trim($xmlResponse)) > 0 && strpos(trim($xmlResponse), '<?xml') === 0) {
            if (!$this->xmlSecurity->scan($xmlResponse)) {
                throw new DocumentValidationException(__('The security validation of the XML document has failed.'));
            }
            $xml = simplexml_load_string($xmlResponse, \Magento\Shipping\Model\Simplexml\Element::class);

            if (in_array($xml->getName(), ['ErrorResponse', 'ShipmentValidateErrorResponse'])
                || isset($xml->GetQuoteResponse->Note->Condition)
            ) {
                $exceptionPhrase = $this->errorProcessor->process($xml, $isShippingLabel);
                throw new DocumentValidationException($exceptionPhrase, null, $exceptionPhrase->getArguments()[0]);
            }
        } else {
            throw new DocumentValidationException(__('The response is in the wrong format'));
        }
    }
}