Added API endpoints for CreditCourse

Endpoints support create, read, and list operations.

NOTE: This commit also includes a retrofitted SimpleRouter that supports overriding the lookup regex. This retrofit is simpler to implement than updating edx-ora2 which is pinned to DRF 2.3.x.

XCOM-524

lms/envs/test.py

@@ -63,6 +63,8 @@ FEATURES['ENABLE_SHOPPING_CART'] = True
 
 FEATURES['ENABLE_VERIFIED_CERTIFICATES'] = True
 
+FEATURES['ENABLE_CREDIT_API'] = True
+
 # Enable this feature for course staff grade downloads, to enable acceptance tests
 FEATURES['ENABLE_S3_GRADE_DOWNLOADS'] = True
 FEATURES['ALLOW_COURSE_STAFF_GRADE_DOWNLOADS'] = True

openedx/core/djangoapps/credit/routers.py

+""" DRF routers. """
+
+from rest_framework import routers
+
+
+class SimpleRouter(routers.SimpleRouter):
+    """ Simple DRF router. """
+
+    # Note (CCB): This is a retrofit of a DRF 2.4 feature onto DRF 2.3. This is, sadly, simpler than
+    # updating edx-ora2 to work with DRF 2.4. See https://github.com/tomchristie/django-rest-framework/pull/1333
+    # for details on this specific DRF 2.4 feature.
+    def get_lookup_regex(self, viewset, lookup_prefix=''):
+        """
+        Given a viewset, return the portion of URL regex that is used
+        to match against a single instance.
+        Note that lookup_prefix is not used directly inside REST rest_framework
+        itself, but is required in order to nicely support nested router
+        implementations, such as drf-nested-routers.
+        https://github.com/alanjds/drf-nested-routers
+        """
+        base_regex = '(?P<{lookup_prefix}{lookup_field}>{lookup_value})'
+        lookup_field = getattr(viewset, 'lookup_field', 'pk')
+        try:
+            lookup_value = viewset.lookup_value_regex
+        except AttributeError:
+            # Don't consume `.json` style suffixes
+            lookup_value = '[^/.]+'
+        return base_regex.format(
+            lookup_prefix=lookup_prefix,
+            lookup_field=lookup_field,
+            lookup_value=lookup_value
+        )

openedx/core/djangoapps/credit/serializers.py

+""" Credit API Serializers """
+
+from rest_framework import serializers
+
+from openedx.core.djangoapps.credit.models import CreditCourse
+
+
+class CreditCourseSerializer(serializers.ModelSerializer):
+    """ CreditCourse Serializer """
+
+    class Meta(object):  # pylint: disable=missing-docstring
+        model = CreditCourse
+        exclude = ('id',)

openedx/core/djangoapps/credit/tests/test_views.py

 """
 Tests for credit app views.
 """
-import unittest
-import json
 import datetime
-import pytz
+import json
+import unittest
 
 import ddt
-from mock import patch
+from django.conf import settings
+from django.core.urlresolvers import reverse
 from django.test import TestCase
 from django.test.utils import override_settings
-from django.core.urlresolvers import reverse
-from django.conf import settings
+from mock import patch
+from oauth2_provider.tests.factories import AccessTokenFactory, ClientFactory
+from opaque_keys.edx.keys import CourseKey
+import pytz
 
 from student.tests.factories import UserFactory
-from util.testing import UrlResetMixin
 from util.date_utils import to_timestamp
-from opaque_keys.edx.keys import CourseKey
+from util.testing import UrlResetMixin
 from openedx.core.djangoapps.credit import api
 from openedx.core.djangoapps.credit.signature import signature
 from openedx.core.djangoapps.credit.models import (
@@ -28,7 +29,7 @@ from openedx.core.djangoapps.credit.models import (
     CreditRequest,
 )
 
-
+JSON = 'application/json'
 TEST_CREDIT_PROVIDER_SECRET_KEY = "931433d583c84ca7ba41784bad3232e6"
 
 
@@ -167,7 +168,7 @@ class CreditProviderViewTests(UrlResetMixin, TestCase):
     )
     def test_create_credit_request_invalid_parameters(self, request_data):
         url = reverse("credit:create_request", args=[self.PROVIDER_ID])
-        response = self.client.post(url, data=request_data, content_type="application/json")
+        response = self.client.post(url, data=request_data, content_type=JSON)
         self.assertEqual(response.status_code, 400)
 
     def test_credit_provider_callback_validates_signature(self):
@@ -228,7 +229,7 @@ class CreditProviderViewTests(UrlResetMixin, TestCase):
     )
     def test_credit_provider_callback_invalid_parameters(self, request_data):
         url = reverse("credit:provider_callback", args=[self.PROVIDER_ID])
-        response = self.client.post(url, data=request_data, content_type="application/json")
+        response = self.client.post(url, data=request_data, content_type=JSON)
         self.assertEqual(response.status_code, 400)
 
     def test_credit_provider_invalid_status(self):
@@ -286,7 +287,7 @@ class CreditProviderViewTests(UrlResetMixin, TestCase):
                 "username": username,
                 "course_key": unicode(course_key),
             }),
-            content_type="application/json",
+            content_type=JSON,
         )
 
     def _create_credit_request_and_get_uuid(self, username, course_key):
@@ -326,7 +327,7 @@ class CreditProviderViewTests(UrlResetMixin, TestCase):
         }
         parameters["signature"] = kwargs.get("sig", signature(parameters, secret_key))
 
-        return self.client.post(url, data=json.dumps(parameters), content_type="application/json")
+        return self.client.post(url, data=json.dumps(parameters), content_type=JSON)
 
     def _assert_request_status(self, uuid, expected_status):
         """
@@ -334,3 +335,126 @@ class CreditProviderViewTests(UrlResetMixin, TestCase):
         """
         request = CreditRequest.objects.get(uuid=uuid)
         self.assertEqual(request.status, expected_status)
+
+
+@unittest.skipUnless(settings.ROOT_URLCONF == 'lms.urls', 'Test only valid in lms')
+class CreditCourseViewSetTests(TestCase):
+    """ Tests for the CreditCourse endpoints.
+
+     GET/POST /api/v1/credit/creditcourse/
+     GET/PUT  /api/v1/credit/creditcourse/:course_id/
+    """
+    password = 'password'
+
+    def setUp(self):
+        super(CreditCourseViewSetTests, self).setUp()
+
+        # This value must be set here, as setting it outside of a method results in issues with CMS/Studio tests.
+        self.path = reverse('credit:creditcourse-list')
+
+        # Create a user and login, so that we can use session auth for the
+        # tests that aren't specifically testing authentication or authorization.
+        user = UserFactory(password=self.password, is_staff=True)
+        self.client.login(username=user.username, password=self.password)
+
+    def _serialize_credit_course(self, credit_course):
+        """ Serializes a CreditCourse to a Python dict. """
+
+        return {
+            'course_key': unicode(credit_course.course_key),
+            'enabled': credit_course.enabled
+        }
+
+    def test_session_auth(self):
+        """ Verify the endpoint supports session authentication, and only allows authorization for staff users. """
+        user = UserFactory(password=self.password, is_staff=False)
+        self.client.login(username=user.username, password=self.password)
+
+        # Non-staff users should not have access to the API
+        response = self.client.get(self.path)
+        self.assertEqual(response.status_code, 403)
+
+        # Staff users should have access to the API
+        user.is_staff = True
+        user.save()  # pylint: disable=no-member
+        response = self.client.get(self.path)
+        self.assertEqual(response.status_code, 200)
+
+    def test_oauth(self):
+        """ Verify the endpoint supports OAuth, and only allows authorization for staff users. """
+        user = UserFactory(is_staff=False)
+        oauth_client = ClientFactory.create()
+        access_token = AccessTokenFactory.create(user=user, client=oauth_client).token
+        headers = {
+            'HTTP_AUTHORIZATION': 'Bearer ' + access_token
+        }
+
+        # Non-staff users should not have access to the API
+        response = self.client.get(self.path, **headers)
+        self.assertEqual(response.status_code, 403)
+
+        # Staff users should have access to the API
+        user.is_staff = True
+        user.save()  # pylint: disable=no-member
+        response = self.client.get(self.path, **headers)
+        self.assertEqual(response.status_code, 200)
+
+    def test_create(self):
+        """ Verify the endpoint supports creating new CreditCourse objects. """
+        course_key = CourseKey.from_string('a/b/c')
+        enabled = True
+        data = {
+            'course_key': unicode(course_key),
+            'enabled': enabled
+        }
+
+        response = self.client.post(self.path, data=json.dumps(data), content_type=JSON)
+        self.assertEqual(response.status_code, 201)
+
+        # Verify the API returns the serialized CreditCourse
+        self.assertDictEqual(json.loads(response.content), data)
+
+        # Verify the CreditCourse was actually created
+        self.assertTrue(CreditCourse.objects.filter(course_key=course_key, enabled=enabled).exists())
+
+    def test_get(self):
+        """ Verify the endpoint supports retrieving CreditCourse objects. """
+        course_id = 'a/b/c'
+        cc1 = CreditCourse.objects.create(course_key=CourseKey.from_string(course_id))
+        path = reverse('credit:creditcourse-detail', args=[course_id])
+
+        response = self.client.get(path)
+        self.assertEqual(response.status_code, 200)
+
+        # Verify the API returns the serialized CreditCourse
+        self.assertDictEqual(json.loads(response.content), self._serialize_credit_course(cc1))
+
+    def test_list(self):
+        """ Verify the endpoint supports listing all CreditCourse objects. """
+        cc1 = CreditCourse.objects.create(course_key=CourseKey.from_string('a/b/c'))
+        cc2 = CreditCourse.objects.create(course_key=CourseKey.from_string('d/e/f'), enabled=True)
+        expected = [self._serialize_credit_course(cc1), self._serialize_credit_course(cc2)]
+
+        response = self.client.get(self.path)
+        self.assertEqual(response.status_code, 200)
+
+        # Verify the API returns a list of serialized CreditCourse objects
+        self.assertListEqual(json.loads(response.content), expected)
+
+    def test_update(self):
+        """ Verify the endpoint supports updating a CreditCourse object. """
+        course_id = 'course-v1:edX+BlendedX+1T2015'
+        credit_course = CreditCourse.objects.create(course_key=CourseKey.from_string(course_id), enabled=False)
+        self.assertFalse(credit_course.enabled)
+
+        path = reverse('credit:creditcourse-detail', args=[course_id])
+        data = {'course_key': course_id, 'enabled': True}
+        response = self.client.put(path, json.dumps(data), content_type=JSON)
+        self.assertEqual(response.status_code, 200)
+
+        # Verify the serialized CreditCourse is returned
+        self.assertDictEqual(json.loads(response.content), data)
+
+        # Verify the data was persisted
+        credit_course = CreditCourse.objects.get(course_key=credit_course.course_key)
+        self.assertTrue(credit_course.enabled)

openedx/core/djangoapps/credit/urls.py

 """
 URLs for the credit app.
 """
-from django.conf.urls import patterns, url
+from django.conf.urls import patterns, url, include
 
-from .api.provider import get_credit_provider_info
-from .views import create_credit_request, credit_provider_callback, get_providers_detail, get_eligibility_for_user
+from openedx.core.djangoapps.credit import views, routers
+from openedx.core.djangoapps.credit.api.provider import get_credit_provider_info
 
 PROVIDER_ID_PATTERN = r'(?P<provider_id>[^/]+)'
 
-urlpatterns = patterns(
+V1_URLS = patterns(
     '',
 
     url(
-        r"^v1/providers/(?P<provider_id>[^/]+)/$",
-        get_credit_provider_info,
-        name="get_provider_info"
+        r'^providers/$',
+        views.get_providers_detail,
+        name='providers_detail'
     ),
+
     url(
-        r"^v1/providers/$",
-        get_providers_detail,
-        name="providers_detail"
+        r'^providers/{provider_id}/$'.format(provider_id=PROVIDER_ID_PATTERN),
+        get_credit_provider_info,
+        name='get_provider_info'
     ),
 
     url(
-        r"^v1/providers/{provider_id}/request/$".format(provider_id=PROVIDER_ID_PATTERN),
-        create_credit_request,
-        name="create_request"
+        r'^providers/{provider_id}/request/$'.format(provider_id=PROVIDER_ID_PATTERN),
+        views.create_credit_request,
+        name='create_request'
     ),
 
     url(
-        r"^v1/providers/{provider_id}/callback/?$".format(provider_id=PROVIDER_ID_PATTERN),
-        credit_provider_callback,
-        name="provider_callback"
+        r'^providers/{provider_id}/callback/?$'.format(provider_id=PROVIDER_ID_PATTERN),
+        views.credit_provider_callback,
+        name='provider_callback'
     ),
 
     url(
-        r"^v1/eligibility/$",
-        get_eligibility_for_user,
-        name="eligibility_details"
+        r'^eligibility/$',
+        views.get_eligibility_for_user,
+        name='eligibility_details'
     ),
+)
+
+router = routers.SimpleRouter()  # pylint: disable=invalid-name
+router.register(r'courses', views.CreditCourseViewSet)
+V1_URLS += router.urls
 
+urlpatterns = patterns(
+    '',
+    url(r'^v1/', include(V1_URLS)),
 )

openedx/core/djangoapps/credit/views.py

@@ -4,27 +4,28 @@ Views for the credit Django app.
 import json
 import datetime
 import logging
-import pytz
 
+from django.conf import settings
 from django.http import (
     HttpResponse,
     HttpResponseBadRequest,
     HttpResponseForbidden,
     Http404
 )
-from django.views.decorators.http import require_POST, require_GET
 from django.views.decorators.csrf import csrf_exempt
-from django.conf import settings
-
-from opaque_keys.edx.keys import CourseKey
+from django.views.decorators.http import require_POST, require_GET
 from opaque_keys import InvalidKeyError
+from opaque_keys.edx.keys import CourseKey
+import pytz
+from rest_framework import viewsets, mixins, permissions, authentication
 
 from util.json_request import JsonResponse
 from util.date_utils import from_timestamp
 from openedx.core.djangoapps.credit import api
-from openedx.core.djangoapps.credit.signature import signature, get_shared_secret_key
 from openedx.core.djangoapps.credit.exceptions import CreditApiBadRequest, CreditRequestNotFound
-
+from openedx.core.djangoapps.credit.models import CreditCourse
+from openedx.core.djangoapps.credit.serializers import CreditCourseSerializer
+from openedx.core.djangoapps.credit.signature import signature, get_shared_secret_key
 
 log = logging.getLogger(__name__)
 
@@ -84,7 +85,7 @@ def create_credit_request(request, provider_id):
 
     This end-point will get-or-create a record in the database to track
     the request.  It will then calculate the parameters to send to
-    the credit provider and digitially sign the parameters, using a secret
+    the credit provider and digitally sign the parameters, using a secret
     key shared with the credit provider.
 
     The user's browser is responsible for POSTing these parameters
@@ -366,3 +367,23 @@ def _validate_timestamp(timestamp_value, provider_id):
             timestamp_value, elapsed_seconds, provider_id,
         )
         return HttpResponseForbidden(u"Timestamp is too far in the past.")
+
+
+class CreditCourseViewSet(mixins.CreateModelMixin, mixins.UpdateModelMixin, viewsets.ReadOnlyModelViewSet):
+    """ CreditCourse endpoints. """
+
+    lookup_field = 'course_key'
+    lookup_value_regex = settings.COURSE_KEY_REGEX
+    queryset = CreditCourse.objects.all()
+    serializer_class = CreditCourseSerializer
+    authentication_classes = (authentication.OAuth2Authentication, authentication.SessionAuthentication,)
+    permission_classes = (permissions.IsAuthenticated, permissions.IsAdminUser)
+
+    def dispatch(self, request, *args, **kwargs):
+        # Convert the course ID/key from a string to an actual CourseKey object.
+        course_id = kwargs.get(self.lookup_field, None)
+
+        if course_id:
+            kwargs[self.lookup_field] = CourseKey.from_string(course_id)
+
+        return super(CreditCourseViewSet, self).dispatch(request, *args, **kwargs)