prevent accessing /admin from extranet

app/controllers/admin/application_controller.rb

 class Admin::ApplicationController < ApplicationController
   layout 'admin/layouts/application'
 
+  before_action :redirect_if_context_is_not_an_university!
   before_action :load_block_copy_cookie
 
   include Admin::Filterable
@@ -37,4 +38,11 @@ class Admin::ApplicationController < ApplicationController
     # If the block doesn't exist anymore
   end
 
+  private
+
+  def redirect_if_context_is_not_an_university!
+    # Currently (Nov 2023), context can be: an extranet, an university (admin) or none.
+    redirect_to root_path unless current_context.is_a?(University)
+  end
+
 end