```ruby
module Lokka
  module GoogleAnalytics
    def self.registered(app)
      app.get '/admin/plugins/google_analytics' do
        haml :"plugin/lokka-google_analytics/views/index", :layout => :"admin/layout"
      end

      app.put '/admin/plugins/google_analytics' do
        Option.tracker = params['tracker']
        Option.tracker_dn = params['tracker_dn']
        flash[:notice] = 'Updated.'
        redirect to('/admin/plugins/google_analytics')
      end

      app.before do
        tracker = Option.tracker
        if !tracker.blank? and ENV['RACK_ENV'] == 'production' and !logged_in?
          dn = Option.tracker_dn
          tracker_script = "<script type=\"text/javascript\">var _gaq=_gaq||[];_gaq.push(['_setAccount','#{tracker}']);"
          tracker_script += "_gaq.push(['_setDomainName', '.#{dn}']);" unless dn.blank?
          tracker_script += "_gaq.push(['_trackPageview']);(function(){var ga=document.createElement('script');ga.type='text/javascript';ga.async=true;ga.src=('https:'==document.location.protocol?'https://ssl':'http://www')+'.google-analytics.com/ga.js';var s=document.getElementsByTagName('script')[0];s.parentNode.insertBefore(ga,s);})();</script>"

          unless dn.blank?
            content_for :header do
              text = <<-EOS
              <script type="text/javascript">
                google_analytics_domain_name  = "#{dn}";
                window.google_analytics_uacct = "UA-accountnumber-propertyindex";
              </script>
              EOS
            end
          end

          content_for :footer do
            tracker_script
          end
        end
      end
    end
  end
end
```

Update Google Analytics Tracking Tag
user
```ruby
module Lokka
  module GoogleAnalytics
    def self.registered(app)
      app.get '/admin/plugins/google_analytics' do
        haml :"plugin/lokka-google_analytics/views/index", :layout => :"admin/layout"
      end

      app.put '/admin/plugins/google_analytics' do
        Option.tracker = params['tracker']
        Option.tracker_dn = params['tracker_dn']
        flash[:notice] = 'Updated.'
        redirect to('/admin/plugins/google_analytics')
      end

      app.before do
        tracker = Option.tracker
        if !tracker.blank? and ENV['RACK_ENV'] == 'production' and !logged_in?
          unless dn.blank?
            content_for :header do
              text = <<~EOS
                <script>
                  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
                  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
                  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
                  })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

                  ga('create', '#{tracker}', 'auto');
                  ga('send', 'pageview');
                </script>
              EOS
            end
          end
        end
      end
    end
  end
end
```
assistant