DeviceBundle/Validator/Constraints/DeviceValidator.php

<?php

namespace DeviceBundle\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use WebserviceBundle\Services\Webservice;

class DeviceValidator extends ConstraintValidator
{

    /**
     * @var string
     */
    private $deviceCheckUrl;

    /**
     * @var Webservice
     */
    private $webservice;


    /**
     * @param Webservice $webservice
     * @param string $deviceCheckUrl
     */
    public function __construct(Webservice $webservice, $deviceCheckUrl)
    {
        $this->webservice = $webservice;
        $this->deviceCheckUrl = $deviceCheckUrl;
    }

    /**
     * @param object $entity
     * @param Constraint $constraint
     */
    public function validate($entity, Constraint $constraint)
    {
        $result = $this->webservice->makeGetRequest($this->deviceCheckUrl);
        $data = json_decode($result, true);
        if (is_null($entity->getId()) && isset($data['result']) && $data['result'] == false) {
            $this->context->buildViolation($constraint->message)
                    ->addViolation();
        }
    }

}