Return back dependency injections & implement plugin factory interface so...

use Drupal\Core\Condition\ConditionPluginBase;

use Drupal\Core\Form\FormStateInterface;

use Drupal\Core\Plugin\ContainerFactoryPluginInterface;

use Symfony\Component\DependencyInjection\ContainerInterface;

use Symfony\Component\HttpFoundation\RequestStack;

/**

 * Pass checks if cookie is present & it's value equal to defined value.

 *   description = @Translation("Allows to select cookie & it's value.")

 * )

 */

class Cookie extends ConditionPluginBase {

class Cookie extends ConditionPluginBase implements ContainerFactoryPluginInterface {

  /**

   * The request stack.

   *

   * @var \Symfony\Component\HttpFoundation\RequestStack

   */

  protected $requestStack;

  /**

   * Creates a new Cookie instance.

   *

   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack

   *   The request stack.

   * @param array $configuration

   *   The plugin configuration, i.e. an array with configuration values keyed

   *   by configuration option name. The special key 'context' may be used to

   *   initialize the defined contexts by setting it to an array of context

   *   values keyed by context names.

   * @param string $plugin_id

   *   The plugin_id for the plugin instance.

   * @param mixed $plugin_definition

   *   The plugin implementation definition.

   */

  public function __construct(RequestStack $request_stack, array $configuration, $plugin_id, $plugin_definition) {

    parent::__construct($configuration, $plugin_id, $plugin_definition);

    $this->requestStack = $request_stack;

  }

  /**

   * {@inheritdoc}

   */

  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {

    return new static(

      $container->get('request_stack'),

      $configuration,

      $plugin_id,

      $plugin_definition

    );

  }

  /**

   * {@inheritdoc}

    $cookie_name = $this->configuration['cookie_name'];

    $cookie_value = $this->configuration['cookie_value'];

    return \Drupal::request()->cookies->get($cookie_name) === $cookie_value;

    $cookies = $this->requestStack->getCurrentRequest()->cookies;

    return $cookies->get($cookie_name) === $cookie_value;

  }

  /**