Change resource_link_id on import (BLD-768).

LTI: Update resource_link_id to change on import to another system or context (BLD-768).

CHANGELOG.rst

@@ -5,6 +5,8 @@ These are notable changes in edx-platform.  This is a rolling list of changes,
 in roughly chronological order, most recent first.  Add your entries at or near
 the top.  Include a label indicating the component affected.
 
+Blades: Update LTI resource_link_id parameter. BLD-768.
+
 Blades: Transcript translations should be displayed in their source language (BLD-935).
 
 Blades: Create an upload modal for video transcript translations (BLD-751).

common/lib/xmodule/xmodule/lti_module.py

@@ -309,8 +309,26 @@ class LTIModule(LTIFields, XModule):
         context and imported into another system or context.
 
         This parameter is required.
+
+        Example:  u'edx.org-i4x-2-3-lti-31de800015cf4afb973356dbe81496df'
+
+        Hostname, edx.org,
+        makes resource_link_id change on import to another system.
+
+        Last part of location, location.name - 31de800015cf4afb973356dbe81496df,
+        is random hash, updated by course_id,
+        this makes resource_link_id unique inside single course.
+
+        First part of location is tag-org-course-category, i4x-2-3-lti.
+
+        Location.name itself does not change on import to another course,
+        but org and course_id change.
+
+        So together with org and course_id in a form of
+        i4x-2-3-lti-31de800015cf4afb973356dbe81496df this part of resource_link_id:
+        makes resource_link_id to be unique among courses inside same system.
         """
-        return unicode(urllib.quote(self.id))
+        return unicode(urllib.quote("{}-{}".format(self.system.hostname, self.location.html_id())))
 
     def get_lis_result_sourcedid(self):
         """

common/lib/xmodule/xmodule/tests/test_lti_unit.py

@@ -59,9 +59,9 @@ class LTIModuleTest(LogicTest):
 
         self.user_id = self.xmodule.runtime.anonymous_student_id
         self.lti_id = self.xmodule.lti_id
-        self.module_id = '//MITx/999/lti/'
+        self.unquoted_resource_link_id= u'{}-i4x-2-3-lti-31de800015cf4afb973356dbe81496df'.format(self.xmodule.runtime.hostname)
 
-        sourcedId = u':'.join(urllib.quote(i) for i in (self.lti_id, self.module_id, self.user_id))
+        sourcedId = u':'.join(urllib.quote(i) for i in (self.lti_id, self.unquoted_resource_link_id, self.user_id))
 
         self.DEFAULTS = {
             'sourcedId': sourcedId,
@@ -255,16 +255,20 @@ class LTIModuleTest(LogicTest):
         self.assertEqual(real_outcome_service_url, expected_outcome_service_url)
 
     def test_resource_link_id(self):
-        with patch('xmodule.lti_module.LTIModule.id', new_callable=PropertyMock) as mock_id:
-            mock_id.return_value = self.module_id
-            expected_resource_link_id = unicode(urllib.quote(self.module_id))
+        with patch('xmodule.lti_module.LTIModule.location', new_callable=PropertyMock) as mock_location:
+            self.xmodule.location.html_id = lambda: 'i4x-2-3-lti-31de800015cf4afb973356dbe81496df'
+            expected_resource_link_id = unicode(urllib.quote(self.unquoted_resource_link_id))
             real_resource_link_id = self.xmodule.get_resource_link_id()
             self.assertEqual(real_resource_link_id, expected_resource_link_id)
 
     def test_lis_result_sourcedid(self):
-        with patch('xmodule.lti_module.LTIModule.id', new_callable=PropertyMock) as mock_id:
-            mock_id.return_value = self.module_id
-            expected_sourcedId = u':'.join(urllib.quote(i) for i in (self.lti_id, self.module_id, self.user_id))
+        with patch('xmodule.lti_module.LTIModule.location', new_callable=PropertyMock) as mock_location:
+            self.xmodule.location.html_id = lambda: 'i4x-2-3-lti-31de800015cf4afb973356dbe81496df'
+            expected_sourcedId = u':'.join(urllib.quote(i) for i in (
+                self.lti_id,
+                urllib.quote(self.unquoted_resource_link_id),
+                self.user_id
+            ))
             real_lis_result_sourcedid = self.xmodule.get_lis_result_sourcedid()
             self.assertEqual(real_lis_result_sourcedid, expected_sourcedId)
 

lms/djangoapps/courseware/tests/test_lti_integration.py

@@ -28,17 +28,18 @@ class TestLTI(BaseTestXmodule):
         mocked_decoded_signature = u'my_signature='
 
         lti_id = self.item_descriptor.lti_id
-        module_id = unicode(urllib.quote(self.item_descriptor.id))
         user_id = unicode(self.item_descriptor.xmodule_runtime.anonymous_student_id)
+        hostname = self.item_descriptor.xmodule_runtime.hostname
+        resource_link_id = unicode(urllib.quote('{}-{}'.format(hostname, self.item_descriptor.location.html_id())))
 
         sourcedId = "{id}:{resource_link}:{user_id}".format(
             id=urllib.quote(lti_id),
-            resource_link=urllib.quote(module_id),
+            resource_link=urllib.quote(resource_link_id),
             user_id=urllib.quote(user_id)
         )
 
         lis_outcome_service_url = 'https://{host}{path}'.format(
-            host=self.item_descriptor.xmodule_runtime.hostname,
+            host=hostname,
             path=self.item_descriptor.xmodule_runtime.handler_url(self.item_descriptor, 'grade_handler', thirdparty=True).rstrip('/?')
         )
         self.correct_headers = {
@@ -49,7 +50,7 @@ class TestLTI(BaseTestXmodule):
             u'lti_version': 'LTI-1p0',
             u'roles': u'Student',
 
-            u'resource_link_id': module_id,
+            u'resource_link_id': resource_link_id,
             u'lis_result_sourcedid': sourcedId,
 
             u'oauth_nonce': mocked_nonce,