From 8ec91fc42d92fa4d15207a508377b8d03c7ee2ba Mon Sep 17 00:00:00 2001
From: Rishi Gupta <rishig@zulipchat.com>
Date: Tue, 11 Dec 2018 22:47:53 -0800
Subject: [PATCH] billing: Remove process_downgrade.

---
 corporate/lib/stripe.py                       |  56 +---------
 .../downgrade:Customer.create.1.json          | Bin 1581 -> 0 bytes
 .../downgrade:Customer.retrieve.1.json        | Bin 4880 -> 0 bytes
 .../downgrade:Customer.retrieve.2.json        | Bin 4884 -> 0 bytes
 .../downgrade:Customer.retrieve.3.json        | Bin 2222 -> 0 bytes
 .../downgrade:Customer.save.1.json            | Bin 1587 -> 0 bytes
 .../downgrade:Invoice.upcoming.1.json         | Bin 6226 -> 0 bytes
 .../downgrade:Subscription.create.1.json      | Bin 2160 -> 0 bytes
 .../downgrade:Subscription.delete.1.json      | Bin 2178 -> 0 bytes
 .../downgrade:Subscription.retrieve.1.json    | Bin 2178 -> 0 bytes
 .../downgrade:Subscription.save.1.json        | Bin 2164 -> 0 bytes
 .../downgrade:Token.create.1.json             | Bin 826 -> 0 bytes
 ...ade_with_money_owed:Customer.create.1.json | Bin 1581 -> 0 bytes
 ...e_with_money_owed:Customer.retrieve.1.json | Bin 4880 -> 0 bytes
 ...e_with_money_owed:Customer.retrieve.2.json | Bin 4880 -> 0 bytes
 ...e_with_money_owed:Customer.retrieve.3.json | Bin 2217 -> 0 bytes
 ...grade_with_money_owed:Customer.save.1.json | Bin 4894 -> 0 bytes
 ...de_with_money_owed:Invoice.upcoming.1.json | Bin 4205 -> 0 bytes
 ..._with_money_owed:InvoiceItem.create.1.json | Bin 459 -> 0 bytes
 ...with_money_owed:Subscription.create.1.json | Bin 2160 -> 0 bytes
 ...with_money_owed:Subscription.delete.1.json | Bin 2174 -> 0 bytes
 ...th_money_owed:Subscription.retrieve.1.json | Bin 2174 -> 0 bytes
 ...ngrade_with_money_owed:Token.create.1.json | Bin 826 -> 0 bytes
 ...ith_no_subscription:Customer.create.1.json | Bin 780 -> 0 bytes
 ...h_no_subscription:Customer.retrieve.1.json | Bin 780 -> 0 bytes
 corporate/tests/test_stripe.py                | 104 +-----------------
 corporate/views.py                            |   2 +-
 27 files changed, 7 insertions(+), 155 deletions(-)
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Customer.create.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Customer.retrieve.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Customer.retrieve.2.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Customer.retrieve.3.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Customer.save.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Invoice.upcoming.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Subscription.create.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Subscription.delete.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Subscription.retrieve.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Subscription.save.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade:Token.create.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Customer.create.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Customer.retrieve.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Customer.retrieve.2.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Customer.retrieve.3.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Customer.save.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Invoice.upcoming.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:InvoiceItem.create.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Subscription.create.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Subscription.delete.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Subscription.retrieve.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_money_owed:Token.create.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_no_subscription:Customer.create.1.json
 delete mode 100644 corporate/tests/stripe_fixtures/downgrade_with_no_subscription:Customer.retrieve.1.json

diff --git a/corporate/lib/stripe.py b/corporate/lib/stripe.py
index 87c7928ceb..882e16f00a 100644
--- a/corporate/lib/stripe.py
+++ b/corporate/lib/stripe.py
@@ -103,29 +103,6 @@ def stripe_get_customer(stripe_customer_id: str) -> stripe.Customer:
 def stripe_get_upcoming_invoice(stripe_customer_id: str) -> stripe.Invoice:
     return stripe.Invoice.upcoming(customer=stripe_customer_id)
 
-@catch_stripe_errors
-def stripe_get_invoice_preview_for_downgrade(
-        stripe_customer_id: str, stripe_subscription_id: str,
-        stripe_subscriptionitem_id: str) -> stripe.Invoice:
-    return stripe.Invoice.upcoming(
-        customer=stripe_customer_id, subscription=stripe_subscription_id,
-        subscription_items=[{'id': stripe_subscriptionitem_id, 'quantity': 0}])
-
-def preview_invoice_total_for_downgrade(stripe_customer: stripe.Customer) -> int:
-    stripe_subscription = extract_current_subscription(stripe_customer)
-    if stripe_subscription is None:
-        # Most likely situation is: user A goes to billing page, user B
-        # cancels subscription, user A clicks on "downgrade" or something
-        # else that calls this function.
-        billing_logger.error("Trying to extract subscription item that doesn't exist, for Stripe customer %s"
-                             % (stripe_customer.id,))
-        raise BillingError('downgrade without subscription', BillingError.TRY_RELOADING)
-    for item in stripe_subscription['items']:
-        # There should only be one item, but we can't index into stripe_subscription['items']
-        stripe_subscriptionitem_id = item.id
-    return stripe_get_invoice_preview_for_downgrade(
-        stripe_customer.id, stripe_subscription.id, stripe_subscriptionitem_id).total
-
 # This allows us to access /billing in tests without having to mock the
 # whole invoice object
 def upcoming_invoice_total(stripe_customer_id: str) -> int:
@@ -289,34 +266,5 @@ def attach_discount_to_realm(user: UserProfile, percent_off: int) -> None:
     else:
         do_replace_coupon(user, coupon)
 
-@catch_stripe_errors
-def process_downgrade(user: UserProfile) -> None:
-    # This is no longer implementing our intended policy. Until that is
-    # resolved we should use the Stripe dashboard to downgrade.
-    assert(settings.TEST_SUITE)
-    stripe_customer = stripe_get_customer(
-        Customer.objects.filter(realm=user.realm).first().stripe_customer_id)
-    subscription_balance = preview_invoice_total_for_downgrade(stripe_customer)
-    # If subscription_balance > 0, they owe us money. This is likely due to
-    # people they added in the last day, so we can just forgive it.
-    # Stripe automatically forgives it when we delete the subscription, so nothing we need to do there.
-    if subscription_balance < 0:
-        stripe_customer.account_balance = stripe_customer.account_balance + subscription_balance
-    stripe_subscription = extract_current_subscription(stripe_customer)
-    # Wish these two could be transaction.atomic
-    stripe_subscription = stripe.Subscription.delete(stripe_subscription)
-    stripe.Customer.save(stripe_customer)
-    with transaction.atomic():
-        user.realm.has_seat_based_plan = False
-        user.realm.save(update_fields=['has_seat_based_plan'])
-        RealmAuditLog.objects.create(
-            realm=user.realm,
-            acting_user=user,
-            event_type=RealmAuditLog.STRIPE_PLAN_CHANGED,
-            event_time=timestamp_to_datetime(stripe_subscription.canceled_at),
-            extra_data=ujson.dumps({'plan': None, 'quantity': stripe_subscription.quantity}))
-    # Doing this last, since it results in user-visible confirmation (via
-    # product changes) that the downgrade succeeded.
-    # Keeping it out of the transaction.atomic block because it will
-    # eventually have a lot of stuff going on.
-    do_change_plan_type(user.realm, Realm.LIMITED)
+def process_downgrade(user: UserProfile) -> None:  # nocoverage
+    pass
diff --git a/corporate/tests/stripe_fixtures/downgrade:Customer.create.1.json b/corporate/tests/stripe_fixtures/downgrade:Customer.create.1.json
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diff --git a/corporate/tests/stripe_fixtures/downgrade:Customer.retrieve.1.json b/corporate/tests/stripe_fixtures/downgrade:Customer.retrieve.1.json
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diff --git a/corporate/tests/stripe_fixtures/downgrade_with_money_owed:Token.create.1.json b/corporate/tests/stripe_fixtures/downgrade_with_money_owed:Token.create.1.json
deleted file mode 100644
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diff --git a/corporate/tests/stripe_fixtures/downgrade_with_no_subscription:Customer.create.1.json b/corporate/tests/stripe_fixtures/downgrade_with_no_subscription:Customer.create.1.json
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diff --git a/corporate/tests/stripe_fixtures/downgrade_with_no_subscription:Customer.retrieve.1.json b/corporate/tests/stripe_fixtures/downgrade_with_no_subscription:Customer.retrieve.1.json
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diff --git a/corporate/tests/test_stripe.py b/corporate/tests/test_stripe.py
index cf834d9143..071639d207 100644
--- a/corporate/tests/test_stripe.py
+++ b/corporate/tests/test_stripe.py
@@ -27,8 +27,7 @@ from corporate.lib.stripe import catch_stripe_errors, \
     do_subscribe_customer_to_plan, attach_discount_to_realm, \
     get_seat_count, extract_current_subscription, sign_string, unsign_string, \
     BillingError, StripeCardError, StripeConnectionError, stripe_get_customer, \
-    DEFAULT_INVOICE_DAYS_UNTIL_DUE, MIN_INVOICED_SEAT_COUNT, do_create_customer, \
-    process_downgrade
+    DEFAULT_INVOICE_DAYS_UNTIL_DUE, MIN_INVOICED_SEAT_COUNT, do_create_customer
 from corporate.models import Customer, Plan, Coupon
 from corporate.views import payment_method_string
 import corporate.urls
@@ -625,27 +624,11 @@ class StripeTest(ZulipTestCase):
 
         # If you signup with a card and then downgrade, we still have your
         # card on file, and should show it
-        realm = do_create_realm('realm1', 'realm1')
-        user = do_create_user('name@realm1.com', 'password', realm, 'name', 'name')
-        self.login(user.email, password='password', realm=realm)
-        self.upgrade(realm=realm)
-        with patch('corporate.lib.stripe.preview_invoice_total_for_downgrade', return_value=1):
-            process_downgrade(user)
-        stripe_customer = stripe_get_customer(Customer.objects.get(realm=user.realm).stripe_customer_id)
-        self.assertEqual('Card ending in 4242', payment_method_string(stripe_customer))
+        # TODO
 
         # If you signup via invoice, and then downgrade immediately, the
         # default_source is in a weird intermediate state.
-        realm = do_create_realm('realm2', 'realm2')
-        user = do_create_user('name@realm2.com', 'password', realm, 'name', 'name')
-        self.login(user.email, password='password', realm=realm)
-        self.upgrade(invoice=True, realm=realm)
-        with patch('corporate.lib.stripe.preview_invoice_total_for_downgrade', return_value=1):
-            process_downgrade(user)
-        stripe_customer = stripe_get_customer(Customer.objects.get(realm=user.realm).stripe_customer_id)
-        # Could be either one, depending on exact timing with the test
-        self.assertTrue('Unknown payment method' in payment_method_string(stripe_customer) or
-                        'No payment method' in payment_method_string(stripe_customer))
+        # TODO
 
     @mock_stripe()
     def test_attach_discount_to_realm(self, *mocks: Mock) -> None:
@@ -673,86 +656,6 @@ class StripeTest(ZulipTestCase):
         upcoming_invoice = stripe.Invoice.upcoming(customer=stripe_customer.id)
         self.assertEqual(upcoming_invoice.amount_due, get_seat_count(user.realm) * 80 * 75)
 
-    # Tests upgrade followed by immediate downgrade. Doesn't test the
-    # calculations for how much credit they should get if they had the
-    # subscription for more than 0 time.
-    @mock_stripe(tested_timestamp_fields=["canceled_at"])
-    def test_downgrade(self, *mocks: Mock) -> None:
-        user = self.example_user('iago')
-        self.login(user.email)
-        self.upgrade()
-        realm = get_realm('zulip')
-        self.assertEqual(realm.has_seat_based_plan, True)
-        self.assertEqual(realm.plan_type, Realm.STANDARD)
-        RealmAuditLog.objects.filter(realm=realm).delete()
-
-        stripe_customer = stripe_get_customer(Customer.objects.get(realm=user.realm).stripe_customer_id)
-        self.assertEqual(stripe_customer.account_balance, 0)
-        # Change subscription in Stripe, but don't pay for it
-        stripe_subscription = extract_current_subscription(stripe_customer)
-        stripe_subscription.quantity = 123
-        stripe.Subscription.save(stripe_subscription)
-
-        response = self.client_post("/json/billing/downgrade", {})
-        self.assert_json_success(response)
-        stripe_customer = stripe_get_customer(stripe_customer.id)
-        self.assertEqual(stripe_customer.account_balance, self.seat_count * -8000)
-        self.assertIsNone(extract_current_subscription(stripe_customer))
-        stripe_subscription = stripe.Subscription.retrieve(stripe_subscription.id)
-        self.assertEqual(stripe_subscription.status, "canceled")
-
-        realm = get_realm('zulip')
-        self.assertEqual(realm.plan_type, Realm.LIMITED)
-        self.assertFalse(realm.has_seat_based_plan)
-
-        audit_log_entries = list(RealmAuditLog.objects.filter(realm=realm)
-                                 .values_list('event_type', 'event_time',
-                                              'requires_billing_update').order_by('id'))
-        self.assertEqual(audit_log_entries, [
-            (RealmAuditLog.STRIPE_PLAN_CHANGED,
-             timestamp_to_datetime(stripe_subscription.canceled_at), False),
-            (RealmAuditLog.REALM_PLAN_TYPE_CHANGED, Kandra(), False),
-        ])
-        self.assertEqual(ujson.loads(RealmAuditLog.objects.filter(
-            event_type=RealmAuditLog.STRIPE_PLAN_CHANGED).values_list('extra_data', flat=True).first()),
-            {'plan': None, 'quantity': 123})
-
-    @mock_stripe()
-    def test_downgrade_with_no_subscription(self, *mocks: Mock) -> None:
-        user = self.example_user("iago")
-        do_create_customer(user)
-        self.login(user.email)
-        with patch("stripe.Customer.save") as mock_save_customer:
-            with patch("corporate.lib.stripe.billing_logger.error"):
-                response = self.client_post("/json/billing/downgrade", {})
-        mock_save_customer.assert_not_called()
-        self.assert_json_error_contains(response, 'Please reload')
-        self.assertEqual(ujson.loads(response.content)['error_description'], 'downgrade without subscription')
-
-    @mock_stripe()
-    def test_downgrade_with_money_owed(self, *mocks: Mock) -> None:
-        user = self.example_user('iago')
-        self.login(user.email)
-        self.upgrade()
-        stripe_customer = stripe_get_customer(Customer.objects.get(realm=user.realm).stripe_customer_id)
-        self.assertEqual(stripe_customer.account_balance, 0)
-        stripe_subscription = extract_current_subscription(stripe_customer)
-        # Create a situation where customer net owes us money
-        stripe.InvoiceItem.create(
-            amount=100000,
-            currency='usd',
-            customer=stripe_customer,
-            subscription=stripe_subscription)
-
-        response = self.client_post("/json/billing/downgrade", {})
-        self.assert_json_success(response)
-        stripe_customer = stripe_get_customer(stripe_customer.id)
-        # Check that positive balance was forgiven
-        self.assertEqual(stripe_customer.account_balance, 0)
-        self.assertIsNone(extract_current_subscription(stripe_customer))
-        stripe_subscription = stripe.Subscription.retrieve(stripe_subscription.id)
-        self.assertEqual(stripe_subscription.status, "canceled")
-
     @mock_stripe()
     def test_replace_payment_source(self, *mocks: Mock) -> None:
         user = self.example_user("hamlet")
@@ -856,6 +759,7 @@ class RequiresBillingAccessTest(ZulipTestCase):
         params = [
             ("/json/billing/sources/change", "do_replace_payment_source",
              {'stripe_token': ujson.dumps('token')}),
+            # TODO: second argument should be something like "process_downgrade"
             ("/json/billing/downgrade", "process_downgrade", {}),
         ]  # type: List[Tuple[str, str, Dict[str, Any]]]
 
diff --git a/corporate/views.py b/corporate/views.py
index 382a4651a1..5d8bf90d7b 100644
--- a/corporate/views.py
+++ b/corporate/views.py
@@ -194,7 +194,7 @@ def billing_home(request: HttpRequest) -> HttpResponse:
     return render(request, 'corporate/billing.html', context=context)
 
 @require_billing_access
-def downgrade(request: HttpRequest, user: UserProfile) -> HttpResponse:
+def downgrade(request: HttpRequest, user: UserProfile) -> HttpResponse:  # nocoverage
     try:
         process_downgrade(user)
     except BillingError as e: