billing: Include link to /plans and /billing in gear menu.

templates/zerver/app/navbar.html

@@ -153,6 +153,20 @@
                                     <span>{{ _('Statistics') }}</span>
                                 </a>
                             </li>
+                            {% if show_plans %}
+                            <li role="presentation">
+                                <a href="/plans" role="menuitem">
+                                    <i class="fa fa-rocket" aria-hidden="true"></i> {{ _('Plans and pricing') }}
+                                </a>
+                            </li>
+                            {% endif %}
+                            {% if show_billing %}
+                            <li role="presentation">
+                                <a href="/billing" role="menuitem">
+                                    <i class="fa fa-credit-card" aria-hidden="true"></i> {{ _('Billing') }}
+                                </a>
+                            </li>
+                            {% endif %}
                             <li class="divider" role="presentation"></li>
                             {% if enable_feedback %}
                             <li role="presentation">

zerver/tests/test_home.py

@@ -23,6 +23,7 @@ from zerver.models import (
     flush_per_request_caches, DefaultStream, Realm,
 )
 from zerver.views.home import home, sent_time_in_epoch_seconds
+from zilencer.models import Customer
 
 class HomeTest(ZulipTestCase):
     def test_home(self) -> None:
@@ -276,7 +277,7 @@ class HomeTest(ZulipTestCase):
                 result = self._get_home_page()
                 self.assertEqual(result.status_code, 200)
                 self.assert_length(cache_mock.call_args_list, 6)
-            self.assert_length(queries, 38)
+            self.assert_length(queries, 39)
 
     @slow("Creates and subscribes 10 users in a loop.  Should use bulk queries.")
     def test_num_queries_with_streams(self) -> None:
@@ -628,6 +629,60 @@ class HomeTest(ZulipTestCase):
         html = result.content.decode('utf-8')
         self.assertNotIn('Invite more users', html)
 
+    def test_show_billing(self) -> None:
+        customer = Customer.objects.create(realm=get_realm("zulip"), stripe_customer_id="cus_id")
+
+        # realm admin, but no billing relationship -> no billing link
+        user = self.example_user('iago')
+        self.login(user.email)
+        result_html = self._get_home_page().content.decode('utf-8')
+        self.assertNotIn('Billing', result_html)
+
+        # realm admin, with billing relationship -> show billing link
+        customer.has_billing_relationship = True
+        customer.save()
+        result_html = self._get_home_page().content.decode('utf-8')
+        self.assertIn('Billing', result_html)
+
+        # billing admin, with billing relationship -> show billing link
+        user.is_realm_admin = False
+        user.is_billing_admin = True
+        user.save(update_fields=['is_realm_admin', 'is_billing_admin'])
+        result_html = self._get_home_page().content.decode('utf-8')
+        self.assertIn('Billing', result_html)
+
+        # billing admin, but no billing relationship -> no billing link
+        customer.has_billing_relationship = False
+        customer.save()
+        result_html = self._get_home_page().content.decode('utf-8')
+        self.assertNotIn('Billing', result_html)
+
+        # billing admin, no customer object -> make sure it doesn't crash
+        customer.delete()
+        result = self._get_home_page()
+        self.assertEqual(result.status_code, 200)
+
+    def test_show_plans(self) -> None:
+        realm = get_realm("zulip")
+        self.login(self.example_email('hamlet'))
+
+        # Show plans link to all users if plan_type is LIMITED
+        realm.plan_type = Realm.LIMITED
+        realm.save(update_fields=["plan_type"])
+        result_html = self._get_home_page().content.decode('utf-8')
+        self.assertIn('Plans', result_html)
+
+        # Show plans link to no one, including admins, if SELF_HOSTED or PREMIUM
+        realm.plan_type = Realm.SELF_HOSTED
+        realm.save(update_fields=["plan_type"])
+        result_html = self._get_home_page().content.decode('utf-8')
+        self.assertNotIn('Plans', result_html)
+
+        realm.plan_type = Realm.PREMIUM
+        realm.save(update_fields=["plan_type"])
+        result_html = self._get_home_page().content.decode('utf-8')
+        self.assertNotIn('Plans', result_html)
+
     def test_desktop_home(self) -> None:
         email = self.example_email("hamlet")
         self.login(email)

zerver/views/home.py

@@ -248,6 +248,17 @@ def home_real(request: HttpRequest) -> HttpResponse:
     if user_profile.is_guest:
         show_invites = False
 
+    show_billing = False
+    show_plans = False
+    if settings.ZILENCER_ENABLED:
+        from zilencer.models import Customer
+        if user_profile.is_billing_admin or user_profile.is_realm_admin:
+            customer = Customer.objects.filter(realm=user_profile.realm).first()
+            if customer is not None and customer.has_billing_relationship:
+                show_billing = True
+        if user_profile.realm.plan_type == Realm.LIMITED:
+            show_plans = True
+
     request._log_data['extra'] = "[%s]" % (register_ret["queue_id"],)
 
     page_params['translation_data'] = {}
@@ -273,6 +284,8 @@ def home_real(request: HttpRequest) -> HttpResponse:
                                'pipeline': settings.PIPELINE_ENABLED,
                                'search_pills_enabled': settings.SEARCH_PILLS_ENABLED,
                                'show_invites': show_invites,
+                               'show_billing': show_billing,
+                               'show_plans': show_plans,
                                'is_admin': user_profile.is_realm_admin,
                                'is_guest': user_profile.is_guest,
                                'show_webathena': user_profile.realm.webathena_enabled,