Add role parameter to LTI. BLD-583.

common/lib/xmodule/xmodule/lti_module.py

@@ -56,7 +56,6 @@ from pkg_resources import resource_string
 from xblock.core import String, Scope, List, XBlock
 from xblock.fields import Boolean, Float
 
-
 log = logging.getLogger(__name__)
 
 
@@ -328,6 +327,25 @@ class LTIModule(LTIFields, XModule):
         """
         return u':'.join(urllib.quote(i) for i in (self.lti_id, self.get_resource_link_id(), self.get_user_id()))
 
+    def get_course(self):
+        """
+        Return course by course id.
+        """
+        course_location = CourseDescriptor.id_to_location(self.course_id)
+        course = self.descriptor.runtime.modulestore.get_item(course_location)
+        return course
+
+    @property
+    def role(self):
+        """
+        Get system user role and convert it to LTI role.
+        """
+        roles = {
+            'student': u'Student',
+            'staff': u'Administrator',
+            'instructor': u'Instructor',
+        }
+        return roles.get(self.system.get_user_role(), u'Student')
 
     def oauth_params(self, custom_parameters, client_key, client_secret):
         """
@@ -351,7 +369,7 @@ class LTIModule(LTIFields, XModule):
             u'launch_presentation_return_url': '',
             u'lti_message_type': u'basic-lti-launch-request',
             u'lti_version': 'LTI-1p0',
-            u'role': u'student',
+            u'roles': self.role,
 
             # Parameters required for grading:
             u'resource_link_id': self.get_resource_link_id(),
@@ -607,10 +625,7 @@ oauth_consumer_key="", oauth_signature="frVp4JuvT1mVXlxktiAUjQ7%2F1cw%3D"'}
         """
         Obtains client_key and client_secret credentials from current course.
         """
-        course_id = self.course_id
-        course_location = CourseDescriptor.id_to_location(course_id)
-        course = self.descriptor.runtime.modulestore.get_item(course_location)
-
+        course = self.get_course()
         for lti_passport in course.lti_passports:
             try:
                 lti_id, key, secret = [i.strip() for i in lti_passport.split(':')]

common/lib/xmodule/xmodule/tests/__init__.py

@@ -77,6 +77,7 @@ def get_test_system(course_id=''):
         open_ended_grading_interface=open_ended_grading_interface,
         course_id=course_id,
         error_descriptor_class=ErrorDescriptor,
+        get_user_role=Mock(is_staff=False),
     )
 
 

common/lib/xmodule/xmodule/x_module.py

@@ -1029,7 +1029,7 @@ class ModuleSystem(ConfigurableFragmentWrapper, Runtime):  # pylint: disable=abs
             open_ended_grading_interface=None, s3_interface=None,
             cache=None, can_execute_unsafe_code=None, replace_course_urls=None,
             replace_jump_to_id_urls=None, error_descriptor_class=None, get_real_user=None,
-            field_data=None,
+            field_data=None, get_user_role=None,
             **kwargs):
         """
         Create a closure around the system environment.
@@ -1082,6 +1082,9 @@ class ModuleSystem(ConfigurableFragmentWrapper, Runtime):  # pylint: disable=abs
         get_real_user - function that takes `anonymous_student_id` and returns real user_id,
         associated with `anonymous_student_id`.
 
+        get_user_role - A function that returns user role. Implementation is different
+            for LMS and Studio.
+
         field_data - the `FieldData` to use for backing XBlock storage.
         """
 
@@ -1119,6 +1122,8 @@ class ModuleSystem(ConfigurableFragmentWrapper, Runtime):  # pylint: disable=abs
 
         self.get_real_user = get_real_user
 
+        self.get_user_role = get_user_role
+
     def get(self, attr):
         """	provide uniform access to attributes (like etree)."""
         return self.__dict__.get(attr)