reminder_bot: Add infra for adding reminder bot to every realm.

zerver/management/commands/create_realm_internal_bots.py

@@ -0,0 +1,40 @@
+
+from typing import Any, Iterable, Text, Tuple
+
+from django.conf import settings
+from django.core.management.base import BaseCommand
+
+from zerver.lib.actions import create_users
+from zerver.models import Realm, UserProfile
+
+class Command(BaseCommand):
+    help = "Create Realm internal bots. These bots provide various services like doing reminders."
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        internal_bots = set([(bot['name'], bot['email_template'] % (settings.INTERNAL_BOT_DOMAIN,))
+                            for bot in settings.REALM_INTERNAL_BOTS])
+
+        existing_bots = list(UserProfile.objects.select_related(
+            'realm').filter(email__in=[bot[1] for bot in internal_bots]))
+
+        all_realms = list(Realm.objects.all())
+
+        for realm in all_realms:
+            this_realm_bots = set()
+            for bot in existing_bots:
+                if bot.realm.string_id == realm.string_id:
+                    this_realm_bots.update([bot])
+            bots_to_create = list(internal_bots - this_realm_bots)
+            if bots_to_create:
+                create_users(realm, bots_to_create, bot_type=UserProfile.DEFAULT_BOT)
+
+        # Set the owners for these bots to the bots themselves
+        bots = UserProfile.objects.filter(
+            email__in=[bot_info[1] for bot_info in internal_bots],
+            bot_owner__isnull=True
+        )
+        for bot in bots:
+            bot.bot_owner = bot
+            bot.save()
+
+        self.stdout.write("Successfully created realm default bots.\n")