Add feature flag for Import/Export API in LMS

This feature flag gates the exposure of the Full course/library
Import/Export API URLs in the LMS. This allows openedX deployments
that operate without Studio to take advantage of the API, while
others may turn the feature off to reserve all content authoring for
Studio.

lms/envs/common.py

@@ -408,6 +408,9 @@ FEATURES = {
 
     # Credit course API
     'ENABLE_CREDIT_API': False,
+
+    # Full Course/Library Import/Export API
+    'ENABLE_IMPORT_EXPORT_LMS': False,
 }
 
 # Ignore static asset files on import which match this pattern

lms/envs/test.py

@@ -493,3 +493,6 @@ PROFILE_IMAGE_MIN_BYTES = 100
 FEATURES['ENABLE_LTI_PROVIDER'] = True
 INSTALLED_APPS += ('lti_provider',)
 AUTHENTICATION_BACKENDS += ('lti_provider.users.LtiBackend',)
+
+# Enable the Full Course/Library Import/Export API
+FEATURES['ENABLE_IMPORT_EXPORT_LMS'] = True

lms/urls.py

@@ -89,11 +89,14 @@ urlpatterns = (
     # Video Abstraction Layer used to allow video teams to manage video assets
     # independently of courseware. https://github.com/edx/edx-val
     url(r'^api/val/v0/', include('edxval.urls')),
-
-    # Full Course/Library Import/Export API
-    url(r'^api/import_export/v1/', include('openedx.core.djangoapps.import_export.urls')),
 )
 
+# Full Course/Library Import/Export API
+if settings.FEATURES["ENABLE_IMPORT_EXPORT_LMS"]:
+    urlpatterns += (
+        url(r'^api/import_export/v1/', include('openedx.core.djangoapps.import_export.urls')),
+    )
+
 if settings.FEATURES["ENABLE_COMBINED_LOGIN_REGISTRATION"]:
     # Backwards compatibility with old URL structure, but serve the new views
     urlpatterns += (

openedx/core/djangoapps/import_export/courses/tests/utils.py

@@ -3,16 +3,16 @@ Utilities for contentstore tests
 '''
 
 from datetime import timedelta
-
+from django.conf import settings
 from django.utils import timezone
+
+from provider.oauth2.models import AccessToken, Client as OAuth2Client
+from provider import constants
 from rest_framework.test import APIClient
 
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
-from django.conf import settings
 
-from provider.oauth2.models import AccessToken, Client as OAuth2Client
-from provider import constants
 
 TEST_DATA_DIR = settings.COMMON_TEST_DATA_ROOT