update devstack video upload authentication mechanism

cms/djangoapps/contentstore/views/tests/test_videos.py

@@ -48,7 +48,6 @@ from ..videos import (
     KEY_EXPIRATION_IN_SECONDS,
     VIDEO_IMAGE_UPLOAD_ENABLED,
     WAFFLE_SWITCHES,
-    AssumeRole,
     StatusDisplayStrings,
     TranscriptProvider,
     _get_default_video_image_url,
@@ -447,16 +446,12 @@ class VideosHandlerTestCase(VideoUploadTestMixin, CourseTestCase):
         response = json.loads(response.content.decode('utf-8'))
         self.assertEqual(response['error'], u'The file name for %s must contain only ASCII characters.' % file_name)
 
+    @override_settings(AWS_ACCESS_KEY_ID='test_key_id', AWS_SECRET_ACCESS_KEY='test_secret', AWS_SECURITY_TOKEN='token')
     @patch('boto.s3.key.Key')
     @patch('boto.s3.connection.S3Connection')
     @override_flag(waffle_flags()[ENABLE_DEVSTACK_VIDEO_UPLOADS].namespaced_flag_name, active=True)
-    def test_assume_role_connection(self, mock_conn, mock_key):
+    def test_devstack_upload_connection(self, mock_conn, mock_key):
         files = [{'file_name': 'first.mp4', 'content_type': 'video/mp4'}]
-        credentials = {
-            'access_key': 'test_key',
-            'secret_key': 'test_secret',
-            'session_token': 'test_session_token'
-        }
         mock_key_instances = [
             Mock(
                 generate_url=Mock(
@@ -466,22 +461,18 @@ class VideosHandlerTestCase(VideoUploadTestMixin, CourseTestCase):
             for file_info in files
         ]
         mock_key.side_effect = mock_key_instances
+        response = self.client.post(
+            self.url,
+            json.dumps({'files': files}),
+            content_type='application/json'
+        )
 
-        with patch.object(AssumeRole, 'get_instance') as assume_role:
-            assume_role.return_value.credentials = credentials
-
-            response = self.client.post(
-                self.url,
-                json.dumps({'files': files}),
-                content_type='application/json'
-            )
-
-            self.assertEqual(response.status_code, 200)
-            mock_conn.assert_called_once_with(
-                aws_access_key_id=credentials['access_key'],
-                aws_secret_access_key=credentials['secret_key'],
-                security_token=credentials['session_token']
-            )
+        self.assertEqual(response.status_code, 200)
+        mock_conn.assert_called_once_with(
+            aws_access_key_id=settings.AWS_ACCESS_KEY_ID,
+            aws_secret_access_key=settings.AWS_SECRET_ACCESS_KEY,
+            security_token=settings.AWS_SECURITY_TOKEN
+        )
 
     @patch('boto.s3.key.Key')
     @patch('boto.s3.connection.S3Connection')

cms/djangoapps/contentstore/views/videos.py

@@ -98,38 +98,6 @@ MAX_UPLOAD_HOURS = 24
 VIDEOS_PER_PAGE = 100
 
 
-class AssumeRole(object):
-    """ Singleton class to establish connection to aws using mfa and assume role """
-    __instance = None
-
-    @staticmethod
-    def get_instance():
-        """ Static access method. """
-        if not AssumeRole.__instance:
-            AssumeRole()
-
-        return AssumeRole.__instance
-
-    def __init__(self):
-        """ Virtually private constructor. """
-        if AssumeRole.__instance:
-            raise Exception("This is a singleton class!")
-
-        sts = STSConnection(
-            settings.AWS_ACCESS_KEY_ID,
-            settings.AWS_SECRET_ACCESS_KEY
-        )
-        self.credentials = sts.assume_role(
-            role_arn=settings.ROLE_ARN,
-            role_session_name='vem',
-            duration_seconds=3600,
-            mfa_serial_number=settings.MFA_SERIAL_NUMBER,
-            mfa_token=settings.MFA_TOKEN
-        ).credentials.to_dict()
-
-        AssumeRole.__instance = self
-
-
 class TranscriptProvider(object):
     """
     Transcription Provider Enumeration
@@ -808,15 +776,14 @@ def videos_post(course, request):
 
 def storage_service_bucket(course_key=None):
     """
-    Returns an S3 bucket for video upload. The S3 bucket returned depends on
-    which pipeline, VEDA or VEM, is enabled.
+    Returns an S3 bucket for video upload.
     """
     if waffle_flags()[ENABLE_DEVSTACK_VIDEO_UPLOADS].is_enabled():
-        credentials = AssumeRole.get_instance().credentials
         params = {
-            'aws_access_key_id': credentials['access_key'],
-            'aws_secret_access_key': credentials['secret_key'],
-            'security_token': credentials['session_token']
+            'aws_access_key_id': settings.AWS_ACCESS_KEY_ID,
+            'aws_secret_access_key': settings.AWS_SECRET_ACCESS_KEY,
+            'security_token': settings.AWS_SECURITY_TOKEN
+
         }
     else:
         params = {

cms/envs/common.py

@@ -563,6 +563,7 @@ AWS_SES_REGION_NAME = 'us-east-1'
 AWS_SES_REGION_ENDPOINT = 'email.us-east-1.amazonaws.com'
 AWS_ACCESS_KEY_ID = None
 AWS_SECRET_ACCESS_KEY = None
+AWS_SECURITY_TOKEN = None
 AWS_QUERYSTRING_AUTH = False
 AWS_STORAGE_BUCKET_NAME = 'SET-ME-PLEASE (ex. bucket-name)'
 AWS_S3_CUSTOM_DOMAIN = 'SET-ME-PLEASE (ex. bucket-name.s3.amazonaws.com)'