Login#
Let's add a login/logout link in the top-right corner.
In our AppComponent, we add a boolean property to manage the login status,
and we use the authentication service to set its value:
export class AppComponent {
  logged = false;
  constructor(
    ...
  ) {
    ...
    this.services.authentication.isAuthenticated.subscribe(auth => {
      this.logged = auth.state;
    });
  }
Now, if we are not logged in yet, we display in app.component.html a link to traverse to the @@login view:
<div class="row">
  <div class="col-md-12">
    <a *ngIf="!logged" traverseTo="@@login" class="pull-right">Login</a>
  </div>
</div>
Let's implement the logout link.
Now if we create private contents in Plone, they won't show unless we are logged in.