Allow messaging backends to be enabled/disabled per organization (#1151)

# What this PR does
Allows messaging backends to be enabled/disabled per organization when
getting a list of available personal notification channels.

## Checklist

- [x] Tests updated
- [ ] Documentation added (N/A)
- [x] `CHANGELOG.md` updated

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Added
+
+- Allow messaging backends to be enabled/disabled per organization ([#1151](https://github.com/grafana/oncall/pull/1151))
+
 ## v1.1.17 (2023-01-18)
 
 ### Changed

engine/apps/api/tests/test_user_notification_policy.py

@@ -1,4 +1,5 @@
 import json
+from unittest.mock import patch
 
 import pytest
 from django.urls import reverse
@@ -8,6 +9,7 @@ from rest_framework.test import APIClient
 
 from apps.api.permissions import LegacyAccessControlRole
 from apps.base.models import UserNotificationPolicy
+from apps.base.tests.messaging_backend import TestOnlyBackend
 
 DEFAULT_NOTIFICATION_CHANNEL = UserNotificationPolicy.NotificationChannel.SLACK
 
@@ -463,3 +465,22 @@ def test_notification_policy_backends_enabled(
     assert response.status_code == status.HTTP_200_OK
     options = [opt["display_name"] for opt in response.json()]
     assert "Test Only Backend" in options
+
+
+@pytest.mark.django_db
+def test_notification_policy_backends_disabled_for_organization(
+    user_notification_policy_internal_api_setup, settings, make_user_auth_headers
+):
+    token, _, users = user_notification_policy_internal_api_setup
+    admin, _ = users
+
+    client = APIClient()
+    url = reverse("api-internal:notification_policy-notify-by-options")
+
+    with patch.object(TestOnlyBackend, "is_enabled_for_organization", return_value=False):
+        response = client.get(url, **make_user_auth_headers(admin, token))
+
+    assert response.status_code == status.HTTP_200_OK
+
+    options = [opt["display_name"] for opt in response.json()]
+    assert "Test Only Backend" not in options

engine/apps/api/views/user_notification_policy.py

@@ -176,7 +176,9 @@ class UserNotificationPolicyView(UpdateSerializerMixin, ModelViewSet):
             built_in_backend_names = {b[0] for b in BUILT_IN_BACKENDS}
             if notification_channel.name not in built_in_backend_names:
                 extra_messaging_backend = get_messaging_backend_from_id(notification_channel.name)
-                if extra_messaging_backend is None:
+                if extra_messaging_backend is None or not extra_messaging_backend.is_enabled_for_organization(
+                    request.auth.organization
+                ):
                     continue
 
             choices.append(

engine/apps/base/messaging.py

@@ -38,6 +38,10 @@ class BaseMessagingBackend:
         """Remove backend link to user account."""
         return
 
+    @staticmethod
+    def is_enabled_for_organization(organization):
+        return True
+
     def serialize_user(self, user):
         """Return a serialized backend user representation."""
         raise NotImplementedError("serialize_user method missing implementation")

engine/apps/mobile_app/backend.py

@@ -4,6 +4,7 @@ from django.conf import settings
 from fcm_django.models import FCMDevice
 
 from apps.base.messaging import BaseMessagingBackend
+from apps.base.models import DynamicSetting
 from apps.mobile_app.tasks import notify_user_async
 
 
@@ -50,6 +51,14 @@ class MobileAppBackend(BaseMessagingBackend):
             critical=critical,
         )
 
+    @staticmethod
+    def is_enabled_for_organization(organization):
+        mobile_app_settings, _ = DynamicSetting.objects.get_or_create(
+            name="mobile_app_settings", defaults={"json_value": {"org_ids": []}}
+        )
+
+        return organization.pk in mobile_app_settings.json_value["org_ids"]
+
 
 class MobileAppCriticalBackend(MobileAppBackend):
     """