signups: Move logic for realm admin notification to corporate app.

As we would like to send similar notifications for other billing
state changes (for all BillingSession types), it makes sense to
move the logic for creating and sending these admin realm internal
messages to the BillingSession framework in the corporate app.

In the case that a channel with the specified name does not exist,
we now send direct messages to the admin realm administrators with
the channel, topic and message so that the information is not lost
and so that the channel for these messages can be created.

corporate/lib/stripe.py

@@ -54,9 +54,10 @@ from zerver.lib.send_email import (
 from zerver.lib.timestamp import datetime_to_timestamp, timestamp_to_datetime
 from zerver.lib.url_encoding import append_url_query_string
 from zerver.lib.utils import assert_is_not_none
-from zerver.models import Realm, RealmAuditLog, UserProfile
+from zerver.models import Realm, RealmAuditLog, Stream, UserProfile
 from zerver.models.realm_audit_logs import AuditLogEventType
 from zerver.models.realms import get_org_type_display_name, get_realm
+from zerver.models.streams import get_stream
 from zerver.models.users import get_system_bot
 from zilencer.lib.remote_counts import MissingDataError
 from zilencer.models import (
@@ -3843,6 +3844,31 @@ class BillingSession(ABC):
 
         return last_ledger
 
+    def send_support_admin_realm_internal_message(
+        self, channel_name: str, topic: str, message: str
+    ) -> None:
+        from zerver.actions.message_send import (
+            internal_send_private_message,
+            internal_send_stream_message,
+        )
+
+        admin_realm = get_realm(settings.SYSTEM_BOT_REALM)
+        sender = get_system_bot(settings.NOTIFICATION_BOT, admin_realm.id)
+        try:
+            channel = get_stream(channel_name, admin_realm)
+            internal_send_stream_message(
+                sender,
+                channel,
+                topic,
+                message,
+            )
+        except Stream.DoesNotExist:  # nocoverage
+            direct_message = (
+                f":red_circle: Channel named '{channel_name}' doesn't exist.\n\n{topic}:\n{message}"
+            )
+            for user in admin_realm.get_human_admin_users():
+                internal_send_private_message(sender, user, direct_message)
+
 
 class RealmBillingSession(BillingSession):
     def __init__(
@@ -4212,6 +4238,14 @@ class RealmBillingSession(BillingSession):
         # anything weird.
         pass
 
+    def send_realm_created_internal_admin_message(self) -> None:
+        channel = "signups"
+        topic = "new organizations"
+        support_url = self.support_url()
+        organization_type = get_org_type_display_name(self.realm.org_type)
+        message = f"[{self.realm.name}]({support_url}) ([{self.realm.display_subdomain}]({self.realm.url})). Organization type: {organization_type}"
+        self.send_support_admin_realm_internal_message(channel, topic, message)
+
 
 class RemoteRealmBillingSession(BillingSession):
     def __init__(

zerver/actions/create_realm.py

@@ -9,7 +9,6 @@ from django.utils.translation import gettext as _
 from django.utils.translation import override as override_language
 
 from confirmation import settings as confirmation_settings
-from zerver.actions.message_send import internal_send_stream_message
 from zerver.actions.realm_settings import (
     do_add_deactivated_redirect,
     do_change_realm_plan_type,
@@ -19,7 +18,7 @@ from zerver.lib.bulk_create import create_users
 from zerver.lib.push_notifications import sends_notifications_directly
 from zerver.lib.remote_server import maybe_enqueue_audit_log_upload
 from zerver.lib.server_initialization import create_internal_realm, server_initialized
-from zerver.lib.streams import ensure_stream, get_signups_stream
+from zerver.lib.streams import ensure_stream
 from zerver.lib.user_groups import (
     create_system_user_groups_for_realm,
     get_role_based_system_groups_dict,
@@ -32,19 +31,12 @@ from zerver.models import (
     RealmAuditLog,
     RealmAuthenticationMethod,
     RealmUserDefault,
-    Stream,
     UserProfile,
 )
 from zerver.models.groups import SystemGroups
 from zerver.models.presence import PresenceSequence
 from zerver.models.realm_audit_logs import AuditLogEventType
-from zerver.models.realms import (
-    CommonPolicyEnum,
-    InviteToRealmPolicyEnum,
-    get_org_type_display_name,
-    get_realm,
-)
-from zerver.models.users import get_system_bot
+from zerver.models.realms import CommonPolicyEnum, InviteToRealmPolicyEnum
 from zproject.backends import all_default_backend_names
 
 
@@ -369,32 +361,12 @@ def do_create_realm(
         prereg_realm.created_realm = realm
         prereg_realm.save(update_fields=["status", "created_realm"])
 
-    # Send a notification to the admin realm when a new organization registers.
     if settings.CORPORATE_ENABLED:
-        from corporate.lib.support import get_realm_support_url
+        # Send a notification to the admin realm when a new organization registers.
+        from corporate.lib.stripe import RealmBillingSession
 
-        admin_realm = get_realm(settings.SYSTEM_BOT_REALM)
-        sender = get_system_bot(settings.NOTIFICATION_BOT, admin_realm.id)
-
-        support_url = get_realm_support_url(realm)
-        organization_type = get_org_type_display_name(realm.org_type)
-
-        message = f"[{realm.name}]({support_url}) ([{realm.display_subdomain}]({realm.url})). Organization type: {organization_type}"
-        topic_name = "new organizations"
-
-        try:
-            signups_stream = get_signups_stream(admin_realm)
-
-            internal_send_stream_message(
-                sender,
-                signups_stream,
-                topic_name,
-                message,
-            )
-        except Stream.DoesNotExist:  # nocoverage
-            # If the signups stream hasn't been created in the admin
-            # realm, don't auto-create it to send to it; just do nothing.
-            pass
+        billing_session = RealmBillingSession(user=None, realm=realm)
+        billing_session.send_realm_created_internal_admin_message()
 
     setup_realm_internal_bots(realm)
     return realm

zerver/lib/streams.py

@@ -835,11 +835,6 @@ def get_stream_by_narrow_operand_access_unchecked(operand: str | int, realm: Rea
     return get_stream_by_id_in_realm(operand, realm)
 
 
-def get_signups_stream(realm: Realm) -> Stream:
-    # This one-liner helps us work around a lint rule.
-    return get_stream("signups", realm)
-
-
 def ensure_stream(
     realm: Realm,
     stream_name: str,