Use controller for setting up QR Code

app/controllers/user_controller.rb

@@ -177,10 +177,9 @@ class UserController < ApplicationController
     current_user.otp_secret_key = User.otp_random_secret
 
     @provisioning_uri = current_user.provisioning_uri(nil, issuer: APP_CONFIG[:hostname])
-    qr_code = RQRCode::QRCode.new(@provisioning_uri, :size => 12, :level => :h)
-    @qr_svg = qr_code.as_svg(offset: 0, color: '000',
-                         shape_rendering: 'crispEdges',
-                         module_size: 4)
+    qr_code = RQRCode::QRCode.new(current_user.provisioning_uri("Retrospring:#{current_user.screen_name}", issuer: "Retrospring"))
+
+    @qr_svg = qr_code.as_svg({offset: 4, module_size: 4, color: '000;fill:var(--primary)'}).html_safe
   end
 
   def update_2fa

app/views/settings/_security.haml

@@ -6,7 +6,7 @@
         .totp-setup__left
           .totp-setup__card
             .totp-setup__qr
-              = RQRCode::QRCode.new(current_user.provisioning_uri("Retrospring:#{current_user.screen_name}", issuer: "Retrospring")).as_svg({:offset => 4, :module_size => 4, :color => '000;fill:var(--primary)'}).html_safe
+              = @qr_svg
             %p.totp-setup__text
               If you cannot scan the QR code, use the following key instead:
               %code= current_user.otp_secret_key.scan(/.{4}/).flatten.join(' ')
@@ -29,4 +29,4 @@
             = f.submit t('views.actions.save'), class: 'btn btn-primary'
     - else
       %p Your account is set up to require the use of a one-time password in order to log in
-      = link_to t('views.actions.remove'), destroy_user_2fa_path, :class => 'btn btn-primary', :method => 'delete', :data => { confirm: "Are you sure you want to disable two-factor authentication?" }
+      = link_to t('views.actions.remove'), destroy_user_2fa_path, class: 'btn btn-primary', method: 'delete', data: { confirm: "Are you sure you want to disable two-factor authentication?" }