Conditional validator

Condition.php

<?php

declare(strict_types=1);

namespace App\Validator\Constraints;

use Symfony\Component\Validator\Constraints\Composite;

/**
 * @Annotation()
 * @Target({"PROPERTY", "METHOD", "ANNOTATION"})
 */
final class Condition extends Composite
{
    public $expression;
    public $constraints = [];

    /**
     * {@inheritdoc}
     */
    public function getDefaultOption()
    {
        return 'expression';
    }

    /**
     * {@inheritdoc}
     */
    public function getRequiredOptions()
    {
        return [
            'expression',
        ];
    }

    /**
     * {@inheritdoc}
     */
    protected function getCompositeOption()
    {
        return 'constraints';
    }
}

ConditionValidator.php

<?php

declare(strict_types=1);

namespace App\Validator\Constraints;

use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

final class ConditionValidator extends ConstraintValidator
{
    private $expressionLanguage;

    public function __construct(?ExpressionLanguage $expressionLanguage = null)
    {
        $this->expressionLanguage = $expressionLanguage ?? new ExpressionLanguage();
    }

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

        $condition = $this->expressionLanguage->evaluate($constraint->expression, [
            'value' => $value,
            'this' => $this->context->getObject(),
        ]);

        if ($condition) {
            $this->context->getValidator()
                ->inContext($this->context)
                ->validate($value, $constraint->constraints);
        }
    }
}

Passport.php

<?php

declare(strict_types=1);

namespace App\Dto;

use App\Validator\Constraints\Condition;
use Symfony\Component\Validator\Constraints as Assert;

final class Passport
{
    public $country;

    /**
     * @Condition("'ru' === this.country", {
     *     @Assert\NotNull(),
     * })
     */
    public $series;
}