feat: add notifications filtering by processors

Signed-off-by: Yaron Dayagi <ydayagi@redhat.com>

plugins/notifications-node/api-report.md

@@ -8,6 +8,7 @@ import { DiscoveryService } from '@backstage/backend-plugin-api';
 import { ExtensionPoint } from '@backstage/backend-plugin-api';
 import { Notification as Notification_2 } from '@backstage/plugin-notifications-common';
 import { NotificationPayload } from '@backstage/plugin-notifications-common';
+import { NotificationSeverity } from '@backstage/plugin-notifications-common';
 import { ServiceRef } from '@backstage/backend-plugin-api';
 
 // @public (undocumented)
@@ -23,6 +24,7 @@ export class DefaultNotificationService implements NotificationService {
 // @public
 export interface NotificationProcessor {
   getName(): string;
+  getNotificationFilters?(): NotificationProcessorFilters;
   postProcess?(
     notification: Notification_2,
     options: NotificationSendOptions,
@@ -36,6 +38,13 @@ export interface NotificationProcessor {
   ): Promise<NotificationSendOptions>;
 }
 
+// @public (undocumented)
+export type NotificationProcessorFilters = {
+  minSeverity?: NotificationSeverity;
+  maxSeverity?: NotificationSeverity;
+  excludedTopics?: string[];
+};
+
 // @public (undocumented)
 export type NotificationRecipients =
   | {

plugins/notifications-node/src/extensions.ts

@@ -14,7 +14,10 @@
  * limitations under the License.
  */
 import { createExtensionPoint } from '@backstage/backend-plugin-api';
-import { Notification } from '@backstage/plugin-notifications-common';
+import {
+  Notification,
+  NotificationSeverity,
+} from '@backstage/plugin-notifications-common';
 import { NotificationSendOptions } from './service';
 
 /**
@@ -90,6 +93,11 @@ export interface NotificationProcessor {
     notification: Notification,
     options: NotificationSendOptions,
   ): Promise<void>;
+
+  /**
+   * notification filters are used to call the processor only in certain conditions
+   */
+  getNotificationFilters?(): NotificationProcessorFilters;
 }
 
 /**
@@ -108,3 +116,12 @@ export const notificationsProcessingExtensionPoint =
   createExtensionPoint<NotificationsProcessingExtensionPoint>({
     id: 'notifications.processing',
   });
+
+/**
+ * @public
+ */
+export type NotificationProcessorFilters = {
+  minSeverity?: NotificationSeverity;
+  maxSeverity?: NotificationSeverity;
+  excludedTopics?: string[];
+};