Base Action subclass for IntelliJ plugin

SignInAction.java

public class SignInAction extends AnAction {
  @Override
  public void actionPerformed(AnActionEvent event) {
    Project project = event.getProject();
    // do your sign in work...
  }
  
  @Override
  public void update(AnActionEvent e) {
    e.getPresentation().setEnabledAndVisible(!isAuthenticated());
  }
  
  private boolean isAuthenticated() {
    // something to determine whether the user is authenticated...
  }
}