Merge pull request #3277 from edx/oleg/custom-params-fix

Do not allow user overwrite some LTI parameters using custom parameters field. BLD-989.

common/lib/xmodule/xmodule/lti_module.py

@@ -191,19 +191,15 @@ class LTIModule(LTIFields, XModule):
         PARAMETERS = [
             "lti_message_type",
             "lti_version",
-            "resource_link_id",
             "resource_link_title",
             "resource_link_description",
-            "user_id",
             "user_image",
-            "roles",
             "lis_person_name_given",
             "lis_person_name_family",
             "lis_person_name_full",
             "lis_person_contact_email_primary",
             "lis_person_sourcedid",
             "role_scope_mentor",
-            "context_id",
             "context_type",
             "context_title",
             "context_label",