OptionalContextCondition.php

<?php

namespace Drupal\condition_test\Plugin\Condition;

use Drupal\Core\Condition\Attribute\Condition;
use Drupal\Core\Condition\ConditionPluginBase;
use Drupal\Core\Plugin\Context\EntityContextDefinition;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Provides a condition with an optional node context.
 *
 * The context type entity:node is used since that would allow to also use this
 * for web tests with the node route context.
 */
class OptionalContextCondition extends ConditionPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function evaluate() {
        // Grant access if no context value is given.
        return !$this->getContextValue('node');
    }
    
    /**
     * {@inheritdoc}
     */
    public function summary() {
        return $this->t('Context with optional context.');
    }

}