I want to restrict a single node to anonymous users in Drupal 8. I don't want to use any module for it as its useless for single restriction as per me.

I know that I can do it with something like this.

{% if user.hasPermission('myPermission') %}
     //my template HTML
{% else %}
    //some login for the customer
{% endif %} 

I don't want to restrict the content via permission, instead I want to restrict it with something like

{% if user.hasRole('authenticated') %}

Is this possible with a theme hook or do I have to use a module?


To check in twig if the user is authenticated you can use the default variable logged_in:

{% if logged_in %}
  <p>The user is authenticated".</p>
{% endif %}

This works because the user module provides the variable in preprocess for all templates:

 * Implements hook_template_preprocess_default_variables_alter().
 * @see user_user_login()
 * @see user_user_logout()
function user_template_preprocess_default_variables_alter(&$variables) {
  $user = \Drupal::currentUser();

  $variables['user'] = clone $user;
  // Remove password and session IDs, since themes should not need nor see them.
  unset($variables['user']->pass, $variables['user']->sid, $variables['user']->ssid);

  $variables['is_admin'] = $user->hasPermission('access administration pages');
  $variables['logged_in'] = $user->isAuthenticated();

Generic roles

If you want to check a generic role, you can't use hasRole(), because this method is not available for accounts. You would have to use getRoles() and check if the role is in the returned array:

{% if 'example_role' in user.getroles  %}
  <p>The user has the role "example_role".</p>
{% endif %}
  • Since the OP is interested in finding out if the user is authenticated, this is the right answer. For a generic role, this would not work. – kiamlaluno Jan 23 '17 at 9:13
  • @kiamlaluno, you are right, this would make a more complete answer, I add the code for a generic role – 4k4 Jan 23 '17 at 9:23
  • the example with generic roles works like charm. to bad that "getroles" was never listed as i searched for it. thank you very much. – Gabbax0r Jan 23 '17 at 9:34
  • I didn't mean the answer was wrong, but it was the one answering the question. Now it is even better, though. I cannot up-vote it since I voted it already, but I would give it a second vote, if I could. – kiamlaluno Jan 23 '17 at 16:40
  • @kiamlaluno, didn't see the problem with the limited account interface right away. It was your hint that I digged a bit deeper where the real problem is. – 4k4 Jan 23 '17 at 16:58

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