nginx/files/_auth.conf

  {%- if site.auth is defined %}
  {%- if site.auth.engine == 'basic' %}
  auth_basic "Restricted";
  {%- if site.auth.htpasswd is defined %}
  auth_basic_user_file /etc/nginx/{{ site.auth.htpasswd }};
  {%- else %}
  auth_basic_user_file /etc/nginx/htpasswd;
  {%- endif %}
  {%- endif %}
  {%- endif %}