Implement U2F registration.

- Move the `TwoFactorAuthsController`'s `new` action to `show`, since
  the page is not used to create a single "two factor auth" anymore. We
  can have a single 2FA authenticator app, along with any number of U2F
  devices, in any combination, so the page will be accessed after the
  first "two factor auth" is created.
- Add the `u2f` javascript library, which provides an API to the
  browser's U2F implementation.
- Add tests for the JS components

1 files changed, 2 insertions, 1 deletions

diff --git a/config/routes.rb b/config/routes.rb
index 1fc7985136b..27ab79d68f5 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -343,8 +343,9 @@ Rails.application.routes.draw do
       resources :keys
       resources :emails, only: [:index, :create, :destroy]
       resource :avatar, only: [:destroy]
-      resource :two_factor_auth, only: [:new, :create, :destroy] do
+      resource :two_factor_auth, only: [:show, :create, :destroy] do
         member do
+          post :create_u2f
           post :codes
           patch :skip
         end