Merge branch 'filter-spam-users' into 'master'

Do not allow spam users to be created

See merge request nilsding/retrospring!68

app/validators/screen_name_validator.rb

@@ -3,10 +3,14 @@ class ScreenNameValidator < ActiveModel::EachValidator
                               notifications inbox sign_in sign_up sidekiq moderation moderator mod administrator
                               siteadmin site_admin help retro_spring retroospring retrosprlng niisding nllsding 
                               pixeidesu plxeldesu plxeidesu terms privacy)
+  FORBIDDEN_SCREEN_NAME_REGEXPS = [/wreciap\z/i]
 
   def validate_each(record, attribute, value)
     if FORBIDDEN_SCREEN_NAMES.include? value.downcase
       record.errors[attribute] << "Thou shalt not use this username!  Please choose another one."
     end
+    if FORBIDDEN_SCREEN_NAME_REGEXPS.any? { |regexp| value.downcase =~ regexp }
+      record.errors[attribute] << "Registration is tempoarily disabled for new users."
+    end
   end
 end