Add client_credential flow to refresh management cmd

ECOM-3602

course_discovery/apps/courses/management/commands/refresh_all_courses.py

 import logging
 
-from django.core.management import BaseCommand, CommandError
+from django.conf import settings
+from django.core.management import BaseCommand
+from edx_rest_api_client.client import EdxRestApiClient
 
 from course_discovery.apps.courses.models import Course
 
@@ -23,8 +25,16 @@ class Command(BaseCommand):
         access_token = options.get('access_token')
 
         if not access_token:
-            msg = 'Courses cannot be migrated if no access token is supplied.'
-            logger.error(msg)
-            raise CommandError(msg)
+            logger.info('No access token provided. Retrieving access token using client_credential flow...')
+
+            try:
+                access_token, __ = EdxRestApiClient.get_oauth_access_token(
+                    '{root}/access_token'.format(root=settings.SOCIAL_AUTH_EDX_OIDC_URL_ROOT),
+                    settings.SOCIAL_AUTH_EDX_OIDC_KEY,
+                    settings.SOCIAL_AUTH_EDX_OIDC_SECRET
+                )
+            except Exception:
+                logger.exception('No access token provided or acquired through client_credential flow.')
+                raise
 
         Course.refresh_all(access_token=access_token)

course_discovery/apps/courses/tests/test_refresh_all_courses.py

-import mock
-from django.core.management import CommandError, call_command
+""" Tests for Refresh All Courses management command. """
+
+from django.core.management import call_command
 from django.test import TestCase
+from django.test.utils import override_settings
+from edx_rest_api_client.client import EdxRestApiClient
+import httpretty
+from mock import patch
+
+from course_discovery.apps.courses.models import Course
 
 
+@override_settings(
+    SOCIAL_AUTH_EDX_OIDC_URL_ROOT="http://auth-url.com/oauth2",
+    SOCIAL_AUTH_EDX_OIDC_KEY="client_id",
+    SOCIAL_AUTH_EDX_OIDC_SECRET="client_secret"
+)
 class RefreshAllCoursesCommandTests(TestCase):
+    """ Tests for refresh_all_courses management command. """
     cmd = 'refresh_all_courses'
 
-    def test_call(self):
-        """ Verify the management command calls Course.refresh_all(). """
+    def test_call_with_access_token(self):
+        """ Verify the management command calls Course.refresh_all() with access token. """
         access_token = 'secret'
 
-        with mock.patch('course_discovery.apps.courses.models.Course.refresh_all') as mock_refresh:
+        with patch.object(Course, 'refresh_all') as mock_refresh:
             call_command(self.cmd, access_token=access_token)
             mock_refresh.assert_called_once_with(access_token=access_token)
 
-    def test_call_without_access_token(self):
-        """ Verify the command requires an access token. """
-        with self.assertRaisesRegex(CommandError, 'Courses cannot be migrated if no access token is supplied.'):
-            call_command(self.cmd)
+    @httpretty.activate
+    def test_call_with_client_credentials(self):
+        """ Verify the management command calls Course.refresh_all() with client credentials. """
+        access_token = 'secret'
+
+        with patch.object(EdxRestApiClient, 'get_oauth_access_token') as mock_access_token:
+            mock_access_token.return_value = (access_token, None)
+            with patch.object(Course, 'refresh_all') as mock_refresh:
+                call_command(self.cmd)
+                mock_refresh.assert_called_once_with(access_token=access_token)
+
+    @httpretty.activate
+    def test_call_with_client_credentials_error(self):
+        """ Verify the command requires an access token to complete. """
+        with patch.object(EdxRestApiClient, 'get_oauth_access_token') as mock_access_token:
+            mock_access_token.side_effect = Exception()
+            with self.assertRaises(Exception):
+                call_command(self.cmd)

docs/getting_started.rst

 Getting Started
 ===============
 
-If you have not already done so, create/activate a `virtualenv`_. Unless otherwise stated, assume all terminal code
+If you have not already done so, create/activate a `virtualenv`_ running Python 3. Unless otherwise stated, assume all terminal code
 below is executed within the virtualenv.
 
 .. _virtualenv: https://virtualenvwrapper.readthedocs.org/en/latest/

requirements/base.txt

@@ -5,6 +5,6 @@ djangorestframework == 3.3.1
 djangorestframework-jwt==1.7.2
 django-rest-swagger[reST]==0.3.4
 edx-auth-backends == 0.1.3
-edx-rest-api-client==1.2.1
+edx-rest-api-client==1.5.0
 elasticsearch>=1.0.0,<2.0.0
 pytz == 2015.7

requirements/test.txt

@@ -7,6 +7,7 @@ django-dynamic-fixture == 1.8.5
 django-nose == 1.4.2
 edx-lint == 0.4.0
 factory-boy==2.6.0
+httpretty==0.8.14
 mock == 1.3.0
 nose-ignore-docstring == 0.2
 pep8 == 1.6.2