CurrentDateContext.php

<?php

namespace Drupal\rules\ContextProvider;

use Drupal\Component\Datetime\TimeInterface;
use Drupal\Core\Plugin\Context\Context;
use Drupal\Core\Plugin\Context\ContextDefinition;
use Drupal\Core\Plugin\Context\ContextProviderInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;

/**
 * Sets the current node as a context on node routes.
 */
class CurrentDateContext implements ContextProviderInterface {
    use StringTranslationTrait;
    
    /**
     * The datetime.time service.
     *
     * @var \Drupal\Component\Datetime\TimeInterface
     */
    protected $datetime;
    
    /**
     * Constructs a new CurrentDateContext.
     *
     * @param \Drupal\Component\Datetime\TimeInterface $datetime
     *   The datetime.time service.
     */
    public function __construct(TimeInterface $datetime) {
        $this->datetime = $datetime;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getRuntimeContexts(array $unqualified_context_ids) {
        $datetime = $this->datetime
            ->getCurrentTime();
        $context_definition = new ContextDefinition('timestamp', $this->t('Current date'));
        $context = new Context($context_definition, $datetime);
        $result = [
            'current_date' => $context,
        ];
        return $result;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getAvailableContexts() {
        return $this->getRuntimeContexts([]);
    }

}