Add role parameter to LTI. BLD-583.

cms/djangoapps/contentstore/tests/test_access.py

@@ -0,0 +1,42 @@
+"""
+Tests access.py
+"""
+from django.test import TestCase
+from django.contrib.auth.models import User
+from xmodule.modulestore import Location
+
+from student.roles import CourseInstructorRole, CourseStaffRole
+from student.tests.factories import AdminFactory
+from student.auth import add_users
+from contentstore.views.access import get_user_role
+
+class RolesTest(TestCase):
+    """
+    Tests for user roles.
+    """
+    def setUp(self):
+        """ Test case setup """
+        self.global_admin = AdminFactory()
+        self.instructor = User.objects.create_user('testinstructor', 'testinstructor+courses@edx.org', 'foo')
+        self.staff = User.objects.create_user('teststaff', 'teststaff+courses@edx.org', 'foo')
+        self.location = Location('i4x', 'mitX', '101', 'course', 'test')
+
+    def test_get_user_role_instructor(self):
+        """
+        Verifies if user is instructor.
+        """
+        add_users(self.global_admin, CourseInstructorRole(self.location), self.instructor)
+        self.assertEqual(
+            'instructor',
+            get_user_role(self.instructor, self.location, self.location.course_id)
+        )
+
+    def test_get_user_role_staff(self):
+        """
+        Verifies if user is staff.
+        """
+        add_users(self.global_admin, CourseStaffRole(self.location), self.staff)
+        self.assertEqual(
+            'staff',
+            get_user_role(self.staff, self.location, self.location.course_id)
+        )

cms/djangoapps/contentstore/views/access.py

@@ -1,6 +1,6 @@
 from ..utils import get_course_location_for_item
 from xmodule.modulestore.locator import CourseLocator
-from student.roles import CourseStaffRole, GlobalStaff
+from student.roles import CourseStaffRole, GlobalStaff, CourseInstructorRole
 from student import auth
 
 
@@ -20,3 +20,17 @@ def has_course_access(user, location, role=CourseStaffRole):
         # this can be expensive if location is not category=='course'
         location = get_course_location_for_item(location)
     return auth.has_access(user, role(location))
+
+
+def get_user_role(user, location, context):
+    """
+    Return corresponding string if user has staff or instructor role in Studio.
+    This will not return student role because its purpose for using in Studio.
+
+    :param location: a descriptor.location
+    :param context: a course_id
+    """
+    if auth.has_access(user, CourseInstructorRole(location, context)):
+        return 'instructor'
+    else:
+        return 'staff'

cms/djangoapps/contentstore/views/preview.py

@@ -26,6 +26,8 @@ from .session_kv_store import SessionKeyValueStore
 from .helpers import render_from_lms
 from ..utils import get_course_for_item
 
+from contentstore.views.access import get_user_role
+
 __all__ = ['preview_handler']
 
 log = logging.getLogger(__name__)
@@ -132,6 +134,7 @@ def _preview_module_system(request, descriptor):
             ),
         ),
         error_descriptor_class=ErrorDescriptor,
+        get_user_role=lambda: get_user_role(request.user, descriptor.location, course_id),
     )