billing: Set max_invites to 3000 for Premium organizations.

This is meant to be effectively infinite for legitimate use.

zerver/lib/actions.py

@@ -3027,6 +3027,10 @@ def do_change_plan_type(user: UserProfile, plan_type: int) -> None:
                                  realm=realm, acting_user=user, event_time=timezone_now(),
                                  extra_data={'old_value': old_value, 'new_value': plan_type})
 
+    if plan_type == Realm.PREMIUM:
+        realm.max_invites = Realm.MAX_INVITES_PREMIUM
+        realm.save(update_fields=['_max_invites'])
+
 def do_change_default_sending_stream(user_profile: UserProfile, stream: Optional[Stream],
                                      log: bool=True) -> None:
     user_profile.default_sending_stream = stream

zerver/models.py

@@ -143,6 +143,7 @@ class Realm(models.Model):
     MAX_REALM_SUBDOMAIN_LENGTH = 40
     MAX_VIDEO_CHAT_PROVIDER_LENGTH = 40
     MAX_GOOGLE_HANGOUTS_DOMAIN_LENGTH = 255  # This is just the maximum domain length by RFC
+    MAX_INVITES_PREMIUM = 3000
     VIDEO_CHAT_PROVIDERS = [u"Jitsi", u"Google Hangouts"]
     AUTHENTICATION_FLAGS = [u'Google', u'Email', u'GitHub', u'LDAP', u'Dev', u'RemoteUser']
     SUBDOMAIN_FOR_ROOT_DOMAIN = ''

zilencer/tests/test_stripe.py

@@ -150,6 +150,7 @@ class StripeTest(ZulipTestCase):
         realm = get_realm("zulip")
         self.assertTrue(realm.has_seat_based_plan)
         self.assertEqual(realm.plan_type, Realm.PREMIUM)
+        self.assertEqual(realm.max_invites, Realm.MAX_INVITES_PREMIUM)
         # Check that we can no longer access /upgrade
         response = self.client_get("/upgrade/")
         self.assertEqual(response.status_code, 302)