add discount restriction stacked config models

openedx/features/discounts/admin.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+"""
+Django Admin pages for DiscountRestrictionConfig.
+"""
+
+from __future__ import absolute_import, unicode_literals
+
+from django.contrib import admin
+from django.utils.translation import ugettext_lazy as _
+
+from openedx.core.djangoapps.config_model_utils.admin import StackedConfigModelAdmin
+
+from .models import DiscountRestrictionConfig
+
+
+class DiscountRestrictionConfigAdmin(StackedConfigModelAdmin):
+    """
+    Admin to configure discount restrictions
+    """
+    fieldsets = (
+        ('Context', {
+            'fields': DiscountRestrictionConfig.KEY_FIELDS,
+            'description': _(
+                'These define the context to enable lms-controlled discounts on. '
+                'If no values are set, then the configuration applies globally. '
+                'If a single value is set, then the configuration applies to all courses '
+                'within that context. At most one value can be set at a time.<br>'
+                'If multiple contexts apply to a course (for example, if configuration '
+                'is specified for the course specifically, and for the org that the course '
+                'is in, then the more specific context overrides the more general context.'
+            ),
+        }),
+        ('Configuration', {
+            'fields': ('enabled',),
+            'description': _(
+                'If any of these values is left empty or "Unknown", then their value '
+                'at runtime will be retrieved from the next most specific context that applies. '
+                'For example, if "Enabled" is left as "Unknown" in the course context, then that '
+                'course will be Enabled only if the org that it is in is Enabled.'
+            ),
+        })
+    )
+    raw_id_fields = ('course',)
+
+admin.site.register(DiscountRestrictionConfig, DiscountRestrictionConfigAdmin)

openedx/features/discounts/applicability.py

@@ -10,6 +10,7 @@ not other discounts like coupons or enterprise/program offers configured in ecom
 """
 from course_modes.models import CourseMode
 from openedx.core.djangoapps.waffle_utils import WaffleFlag, WaffleFlagNamespace
+from openedx.features.discounts.models import DiscountRestrictionConfig
 
 # .. feature_toggle_name: discounts.enable_discounting
 # .. feature_toggle_type: flag
@@ -50,6 +51,10 @@ def can_receive_discount(user, course):  # pylint: disable=unused-argument
     if not verified_mode:
         return False
 
+    # Site, Partner, Course or Course Run not excluded from lms-controlled discounts
+    if not DiscountRestrictionConfig.enabled_for_course(course):
+        return False
+
     return True
 
 

openedx/features/discounts/migrations/0001_initial.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.20 on 2019-05-22 18:31
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+import openedx.core.djangoapps.config_model_utils.models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('course_overviews', '0014_courseoverview_certificate_available_date'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('sites', '0002_alter_domain_unique'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='DiscountRestrictionConfig',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('change_date', models.DateTimeField(auto_now_add=True, verbose_name='Change date')),
+                ('enabled', models.NullBooleanField(default=None, verbose_name='Enabled')),
+                ('org', models.CharField(blank=True, db_index=True, help_text='Configure values for all course runs associated with this Organization. This is the organization string (i.e. edX, MITx).', max_length=255, null=True)),
+                ('org_course', models.CharField(blank=True, db_index=True, help_text="Configure values for all course runs associated with this course. This is should be formatted as 'org+course' (i.e. MITx+6.002x, HarvardX+CS50).", max_length=255, null=True, validators=[openedx.core.djangoapps.config_model_utils.models.validate_course_in_org], verbose_name='Course in Org')),
+                ('changed_by', models.ForeignKey(editable=False, null=True, on_delete=django.db.models.deletion.PROTECT, to=settings.AUTH_USER_MODEL, verbose_name='Changed by')),
+                ('course', models.ForeignKey(blank=True, help_text='Configure values for this course run. This should be formatted as the CourseKey (i.e. course-v1://MITx+6.002x+2019_Q1)', null=True, on_delete=django.db.models.deletion.DO_NOTHING, to='course_overviews.CourseOverview', verbose_name='Course Run')),
+                ('site', models.ForeignKey(blank=True, help_text='Configure values for all course runs associated with this site.', null=True, on_delete=django.db.models.deletion.CASCADE, to='sites.Site')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.AddIndex(
+            model_name='discountrestrictionconfig',
+            index=models.Index(fields=['site', 'org', 'course'], name='discounts_d_site_id_d67da3_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='discountrestrictionconfig',
+            index=models.Index(fields=['site', 'org', 'org_course', 'course'], name='discounts_d_site_id_f83727_idx'),
+        ),
+    ]

openedx/features/discounts/models.py

@@ -0,0 +1,35 @@
+"""
+DiscountRestrictionConfig Models
+"""
+
+# -*- coding: utf-8 -*-
+from __future__ import absolute_import, unicode_literals
+
+from django.utils.encoding import python_2_unicode_compatible
+
+from openedx.core.djangoapps.config_model_utils.models import StackedConfigurationModel
+
+
+@python_2_unicode_compatible
+class DiscountRestrictionConfig(StackedConfigurationModel):
+    """
+    A ConfigurationModel used to manage restrictons for lms-controlled discounts
+    """
+
+    STACKABLE_FIELDS = ('enabled',)
+
+    @classmethod
+    def enabled_for_course(cls, course):
+        """
+        Return whether lms-controlled discounts can be enabled for this course.
+
+        Arguments:
+            course: The CourseOverview of the course being queried.
+        """
+        current_config = cls.current(course_key=course.id)
+        return current_config.enabled
+
+    def __str__(self):
+        return "DiscountRestrictionConfig(enabled={!r})".format(
+            self.enabled
+        )

openedx/features/discounts/tests/test_applicability.py

@@ -5,7 +5,9 @@ from datetime import timedelta
 from django.utils.timezone import now
 
 from course_modes.tests.factories import CourseModeFactory
+from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
 from openedx.core.djangoapps.waffle_utils.testutils import override_waffle_flag
+from openedx.features.discounts.models import DiscountRestrictionConfig
 from student.tests.factories import UserFactory
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
@@ -23,6 +25,8 @@ class TestApplicability(ModuleStoreTestCase):
         super(TestApplicability, self).setUp()
         self.user = UserFactory.create()
         self.course = CourseFactory.create(run='test', display_name='test')
+        course_overview = CourseOverview.get_from_id(self.course.id)
+        DiscountRestrictionConfig.objects.create(enabled=True, course=course_overview)
         CourseModeFactory.create(course_id=self.course.id, mode_slug='verified')
 
     def test_can_receive_discount(self):
@@ -39,9 +43,13 @@ class TestApplicability(ModuleStoreTestCase):
         self.assertEqual(applicability, True)
 
         no_verified_mode_course = CourseFactory(end=now() + timedelta(days=30))
+        no_verified_mode_course_overview = CourseOverview.get_from_id(no_verified_mode_course.id)
+        DiscountRestrictionConfig.objects.create(enabled=True, course=no_verified_mode_course_overview)
         applicability = can_receive_discount(user=self.user, course=no_verified_mode_course)
         self.assertEqual(applicability, False)
 
         course_that_has_ended = CourseFactory(end=now() - timedelta(days=30))
+        course_that_has_ended_overview = CourseOverview.get_from_id(course_that_has_ended.id)
+        DiscountRestrictionConfig.objects.create(enabled=True, course=course_that_has_ended_overview)
         applicability = can_receive_discount(user=self.user, course=course_that_has_ended)
         self.assertEqual(applicability, False)

openedx/features/discounts/tests/test_discount_restriction_models.py

@@ -0,0 +1,103 @@
+"""
+Test discount restriction config
+"""
+from __future__ import absolute_import
+
+import itertools
+
+import ddt
+
+from openedx.core.djangoapps.content.course_overviews.tests.factories import CourseOverviewFactory
+from openedx.core.djangoapps.site_configuration.tests.factories import SiteConfigurationFactory
+from openedx.core.djangolib.testing.utils import CacheIsolationTestCase
+from openedx.features.discounts.models import DiscountRestrictionConfig
+from student.tests.factories import UserFactory
+
+
+@ddt.ddt
+class TestDiscountRestrictionConfig(CacheIsolationTestCase):
+    """
+    Test discount restriction config
+    """
+    ENABLED_CACHES = ['default']
+
+    def setUp(self):
+        self.course_overview = CourseOverviewFactory.create()
+        self.user = UserFactory.create()
+        super(TestDiscountRestrictionConfig, self).setUp()
+
+    @ddt.data(True, False)
+    def test_enabled_for_course(
+        self,
+        enabled,
+    ):
+        DiscountRestrictionConfig.objects.create(
+            enabled=enabled,
+            course=self.course_overview,
+        )
+        course_key = self.course_overview.id
+
+        self.assertEqual(
+            enabled,
+            DiscountRestrictionConfig.current(course_key=course_key).enabled
+        )
+
+    @ddt.data(
+        # Generate all combinations of setting each configuration level to True/False/None
+        *itertools.product(*[(True, False, None)] * 4)
+    )
+    @ddt.unpack
+    def test_config_overrides(self, global_setting, site_setting, org_setting, course_setting):
+        """
+        Test that the stacked configuration overrides happen in the correct order and priority.
+
+        This is tested by exhaustively setting each combination of contexts, and validating that only
+        the lowest level context that is set to not-None is applied.
+        """
+        # Add a bunch of configuration outside the contexts that are being tested, to make sure
+        # there are no leaks of configuration across contexts
+        non_test_course_enabled = CourseOverviewFactory.create(org='non-test-org-enabled')
+        non_test_course_disabled = CourseOverviewFactory.create(org='non-test-org-disabled')
+        non_test_site_cfg_enabled = SiteConfigurationFactory.create(
+            values={'course_org_filter': non_test_course_enabled.org}
+        )
+        non_test_site_cfg_disabled = SiteConfigurationFactory.create(
+            values={'course_org_filter': non_test_course_disabled.org}
+        )
+
+        DiscountRestrictionConfig.objects.create(course=non_test_course_enabled, enabled=True)
+        DiscountRestrictionConfig.objects.create(course=non_test_course_disabled, enabled=False)
+        DiscountRestrictionConfig.objects.create(org=non_test_course_enabled.org, enabled=True)
+        DiscountRestrictionConfig.objects.create(org=non_test_course_disabled.org, enabled=False)
+        DiscountRestrictionConfig.objects.create(site=non_test_site_cfg_enabled.site, enabled=True)
+        DiscountRestrictionConfig.objects.create(site=non_test_site_cfg_disabled.site, enabled=False)
+
+        # Set up test objects
+        test_course = CourseOverviewFactory.create(org='test-org')
+        test_site_cfg = SiteConfigurationFactory.create(values={'course_org_filter': test_course.org})
+
+        DiscountRestrictionConfig.objects.create(enabled=global_setting)
+        DiscountRestrictionConfig.objects.create(course=test_course, enabled=course_setting)
+        DiscountRestrictionConfig.objects.create(org=test_course.org, enabled=org_setting)
+        DiscountRestrictionConfig.objects.create(site=test_site_cfg.site, enabled=site_setting)
+
+        expected_global_setting = self._resolve_settings([global_setting])
+        expected_site_setting = self._resolve_settings([global_setting, site_setting])
+        expected_org_setting = self._resolve_settings([global_setting, site_setting, org_setting])
+        expected_course_setting = self._resolve_settings([global_setting, site_setting, org_setting, course_setting])
+
+        self.assertEqual(expected_global_setting, DiscountRestrictionConfig.current().enabled)
+        self.assertEqual(expected_site_setting, DiscountRestrictionConfig.current(site=test_site_cfg.site).enabled)
+        self.assertEqual(expected_org_setting, DiscountRestrictionConfig.current(org=test_course.org).enabled)
+        self.assertEqual(expected_course_setting, DiscountRestrictionConfig.current(course_key=test_course.id).enabled)
+
+    def _resolve_settings(self, settings):
+        if all(setting is None for setting in settings):
+            return None
+
+        return [
+            setting
+            for setting
+            in settings
+            if setting is not None
+        ][-1]