trait RedirectDestinationTrait

trait RedirectDestinationTrait {
    
    /**
     * The redirect destination service.
     *
     * @var \Drupal\Core\Routing\RedirectDestinationInterface
     */
    protected $redirectDestination;
    
    /**
     * Prepares a 'destination' URL query parameter for use with \Drupal\Core\Url.
     *
     * @see \Drupal\Core\Routing\RedirectDestinationInterface::getAsArray()
     *
     * @return array
     *   An associative array containing the key:
     *   - destination: The value of the current request's 'destination' query
     *     parameter, if present. This can be either a relative or absolute URL.
     *     However, for security, redirection to external URLs is not performed.
     *     If the query parameter isn't present, then the URL of the current
     *     request is returned.
     */
    protected function getDestinationArray() {
        return $this->getRedirectDestination()
            ->getAsArray();
    }
    
    /**
     * Returns the redirect destination service.
     *
     * @return \Drupal\Core\Routing\RedirectDestinationInterface
     *   The redirect destination helper.
     */
    protected function getRedirectDestination() {
        if (!isset($this->redirectDestination)) {
            $this->redirectDestination = \Drupal::destination();
        }
        return $this->redirectDestination;
    }
    
    /**
     * Sets the redirect destination service.
     *
     * @param \Drupal\Core\Routing\RedirectDestinationInterface $redirect_destination
     *   The redirect destination service.
     *
     * @return $this
     */
    public function setRedirectDestination(RedirectDestinationInterface $redirect_destination) {
        $this->redirectDestination = $redirect_destination;
        return $this;
    }

}