Symfony2 - Call EmailValidator inside a Custom Validator

Question

I'm creating a custom validator constraint to validate a "Contact", which is something like "John Doe <[email protected]>". Following the Cookbook I've created the Constraint Class:

<?php

namespace MyCompany\MyBundle\Validator\Constraints;

use Symfony\Component\Validator\Constraint;

/**
 * @Annotation
 */
class Contact extends Constraint
{
    public $message = 'The string "%string%" is not a valid Contact.';
}

and also created the validator:

<?php

namespace MyCompany\MyBundle\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Constraints\Email;
use Symfony\Component\Validator\Constraints\EmailValidator;

class ContactValidator extends ConstraintValidator
{
    public function validate($value, Constraint $constraint)
    {
        if (!preg_match('#(.*)\s+<(.*)>#', $value, $matches)) {
            $this->context->addViolation($constraint->message, array('%string%' => $value));
        }

        $emailValidator = new EmailValidator();
        if (isset($matches[2]) && $emailValidator->validate($matches[2], new Email())) {
            $this->context->addViolation($constraint->message, array('%string%' => $value));    
        }
    }
}

The point is that I'm trying to use the Symfony's EmailValidator inside my custom validator to check the email is valid. I don't want to reinvent the wheel and validate the email using my own regex.

Everything is ok when trying to validate a valid contact but, testing a contact with invalid email ("Gabriel Garcia <infoinv4l1d3mai1.com>") it craches with a PHP Fatal error:

Fatal error: Call to a member function addViolation() on a non-object in /home/dev/myproject/vendor/symfony/symfony/src/Symfony/Component/Validator/Constraints/EmailValidator.php on line 58

Digging into the EmailValidator.php class, I've realized that the issue is related to the $context (ExecutionContext). Here is line 58 of EmailValidator.php:

$this->context->addViolation($constraint->message, array('{{ value }}' => $value));

Seems that context attribute of the class is null. Anyone knows why? I need to inject it somewhere?

Thanks in advance.

P.S.: I'm using Symfony 2.3. Do not pay attention to the regex, I know it can be so much better. It's just for testing right now.

Answer 1

You can directly use the constraint

see http://symfony.com/doc/current/book/validation.html

use Symfony\Component\Validator\Constraints\Email

$emailConstraint = new Email();

// use the validator to validate the value
$errorList = $this->get('validator')->validateValue(
    $email,
    $emailConstraint
);

Best regard