EuropeanVatValidator.php

<?php

declare(strict_types=1);

namespace MyPackage\Validator\Constraints\Vat;

use Psr\Log\LoggerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

class EuropeanVatValidator extends ConstraintValidator
{
    /**
     * @var LoggerInterface
     */
    protected $logger;

    public function __construct(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }

    /**
     * {@inheritdoc}
     */
    public function validate($value, Constraint $constraint)
    {
        if (!$constraint instanceof EuropeanVat) {
            throw new UnexpectedTypeException($constraint, EuropeanVat::class);
        }

        if (\count($this->context->getViolations())) {
            return;
        }

        $countryCode = mb_substr($value, 0, 2);
        $vatNumber = mb_substr($value, 2);

        $data = $this->context->getRoot()->getData();

        if ($countryCode != $data->getAddress()->getCountryCode()) {
            $this->context->addViolation($constraint->invalidCountryCode);

            return;
        }

        try {
            $client = new \SoapClient($constraint->wsdlValidationUrl);
            $result = $client->checkVat([
                'countryCode' => $countryCode,
                'vatNumber' => $vatNumber,
            ]);
        } catch (\SoapFault $e) {
            // TODO: since the server is frequently unavailable, we do not blame the user for it...
            $this->logger->error($e->getMessage());
            //$this->context->addViolation($constraint->serverUnreachable);

            return;
        }

        if ($result->valid) {
            return;
        }

        $this->context->addViolation($constraint->message);
    }
}