restrict name to be set to lis_person_name_full (should be display name) or to lis_person_name_given (should be first name).

don't use xikolo api any longer for consumer openHPI, use the values in CodeOcean.

app/models/external_user.rb

@@ -5,11 +5,9 @@ class ExternalUser < ActiveRecord::Base
   validates :external_id, presence: true
 
   def displayname
-    result =  "User " + id.to_s
-    if(!consumer.nil? && consumer.name == 'openHPI')
-      result = Rails.cache.fetch("#{cache_key}/displayname", expires_in: 12.hours) do
-         Xikolo::UserClient.get(external_id.to_s)[:display_name]
-      end
+    result = name
+    if(result == nil || discount == "")
+      result = "User " + id.to_s
     end
     result
   end