Add ability to resend code

app/controllers/devise/two_factor_authentication_controller.rb

@@ -27,6 +27,11 @@ class Devise::TwoFactorAuthenticationController < DeviseController
     end
   end
 
+  def resend_code
+    resource.send_two_factor_authentication_code
+    redirect_to user_two_factor_authentication_path, notice: "Your authentication code has been sent."
+  end
+
   private
 
     def authenticate_scope!

app/views/devise/two_factor_authentication/show.html.erb

@@ -7,4 +7,5 @@
   <%= submit_tag "Submit" %>
 <% end %>
 
+<%= link_to 'Resend Code', resend_code_user_two_factor_authentication_path, action: :get %>
 <%= link_to "Sign out", destroy_user_session_path, :method => :delete %>

lib/two_factor_authentication/routes.rb

@@ -3,7 +3,9 @@ module ActionDispatch::Routing
     protected
 
       def devise_two_factor_authentication(mapping, controllers)
-        resource :two_factor_authentication, :only => [:show, :update], :path => mapping.path_names[:two_factor_authentication], :controller => controllers[:two_factor_authentication]
+        resource :two_factor_authentication, :only => [:show, :update, :resend_code], :path => mapping.path_names[:two_factor_authentication], :controller => controllers[:two_factor_authentication] do
+          collection { get "resend_code" }
+        end
       end
   end
 end