add cloudflare 2fa verify stuff

Author: manuelmeurer

app/controllers/application_controller.rb

@@ -4,4 +4,8 @@ class ApplicationController < ActionController::Base
   def home
     render "shared/home"
   end
+
+  def cloudflare_verify
+    render plain: ENV.fetch("CLOUDFLARE_2FA_VERIFY")
+  end
 end

app/views/layouts/application.html.haml

@@ -14,6 +14,7 @@
     %meta{ "http-equiv": "Content-Type",    content: "text/html; charset=utf-8" }
 
     %meta{ name: "viewport",                content: "width=device-width,initial-scale=1" }
+    %meta{ name: "cf-2fa-verify",           content: ENV.fetch("CLOUDFLARE_2FA_VERIFY") }
 
     = stylesheet_link_tag :application, data: { turbo_track: "reload" }, media: "all"
 

config/routes.rb

@@ -16,6 +16,8 @@
 Rails.application.routes.draw do
   mount Sidekiq::Web => "sidekiq"
 
+  get "/.well-known/cf-2fa-verify.txt" => "application#cloudflare_verify"
+
   get ":sitemap", sitemap: /sitemap[A-Za-z\d.]*/, to: redirect { "https://#{ENV.fetch "CLOUDFLARE_R2_BUCKET_URL"}#{_2.path}" }
 
   root "application#home"