Add configurable prevention of user registration

Should be done appropriately soon.

lib/outlook_web/router.ex

@@ -3,6 +3,8 @@ defmodule OutlookWeb.Router do
 
   import OutlookWeb.UserAuth
 
+  import Outlook.PreventRegistration
+
   pipeline :browser do
     plug :accepts, ["html"]
     plug :fetch_session
@@ -18,6 +20,10 @@ defmodule OutlookWeb.Router do
     plug :put_layout, {OutlookWeb.Layouts, :public}
   end
 
+  pipeline :check_registration do
+    plug :prevent_registration
+  end
+
   pipeline :api do
     plug :accepts, ["json"]
   end
@@ -56,7 +62,7 @@ defmodule OutlookWeb.Router do
   ## Authentication routes
 
   scope "/", OutlookWeb do
-    pipe_through [:browser, :redirect_if_user_is_authenticated]
+    pipe_through [:browser, :redirect_if_user_is_authenticated, :check_registration]
 
     live_session :redirect_if_user_is_authenticated,
       on_mount: [{OutlookWeb.UserAuth, :redirect_if_user_is_authenticated}] do