Add ability to block sign-ups from IP (#19037)

app/controllers/auth/registrations_controller.rb

@@ -82,7 +82,7 @@ class Auth::RegistrationsController < Devise::RegistrationsController
   end
 
   def check_enabled_registrations
-    redirect_to root_path if single_user_mode? || omniauth_only? || !allowed_registrations?
+    redirect_to root_path if single_user_mode? || omniauth_only? || !allowed_registrations? || ip_blocked?
   end
 
   def allowed_registrations?
@@ -93,6 +93,10 @@ class Auth::RegistrationsController < Devise::RegistrationsController
     ENV['OMNIAUTH_ONLY'] == 'true'
   end
 
+  def ip_blocked?
+    IpBlock.where(severity: :sign_up_block).where('ip >>= ?', request.remote_ip.to_s).exists?
+  end
+
   def invite_code
     if params[:user]
       params[:user][:invite_code]