How can I restrict page access based on customer tags in Liquid?

[LaurenV]

I'm getting started on a new liquid page template where some secret content should be visible to customers with the tag 'Active'. Any customers without the tag should see a 'not allowed' message. I also want to be sure that while editing the site, admins/editors are able to preview both sections in order to edit content for either case. The main issue seems to be displaying the 'not allowed message' outside of the Theme Customizer but I'm not sure where to go from here. Here is my logic and current output:

{% unless customer.tags contains 'Active' %}
  {% section 'not-allowed-message' %}
{% endunless %}
{% if customer.tags contains 'Active' or request.design_mode or content_for_header contains 'AdminBarInjector' %}
  {% section 'secret-content' %}
{% endif %}

Location	Output	Expected
Theme Customizer	Both	Both
Preview Store while signed in as an admin/editor	Secret Content only	Both
Preview Store while signed out/in incognito	Nothing	Not Allowed Message only
Preview Store while signed in as a customer with the 'Active' tag	Secret Content only	Secret Content only

Any help or suggestions are greatly appreciated!

[JoesIdeas · Accepted solution]

I use this to show only in preview mode:

{% if content_for_header contains "previewBarInjector.init()" %}
<p>This shows only in preview mode</p>
{% endif %}

[LaurenV]

Thank you! I still have no idea why the unless portion of the code was not originally working, but after replacing AdminBarInjector with previewBarInjector.init(), the logic worked about as expected. There's one caveat, however it's something I can look past unless my client specifically comes back and asks for it.

Location	Output	Expected
Preview Store while signed in as an admin/editor	Not Allowed Message only	Both

Thanks again for your help!