feat(slack): Support new backend system (#56)

plugins/slack-catalog-backend/README.md

@@ -30,6 +30,14 @@ Enriches existing `User` entities with information from Slack, notably the user'
 
 #### Installation
 
+Add the following to your `packages/backend/index.ts`:
+
+```ts
+backend.add(import('@seatgeek/backstage-plugin-slack-catalog-backend'));
+```
+
+##### Legacy backend system
+
 Add the following to your `packages/backend/catalog.ts`:
 
 ```ts

plugins/slack-catalog-backend/package.json

@@ -23,9 +23,11 @@
   },
   "dependencies": {
     "@backstage/backend-common": "^0.20.1",
+    "@backstage/backend-plugin-api": "^0.6.16",
     "@backstage/catalog-model": "^1.4.3",
     "@backstage/config": "^1.1.1",
     "@backstage/plugin-catalog-common": "^1.0.20",
+    "@backstage/plugin-catalog-node": "^1.11.0",
     "@slack/web-api": "^7.0.2",
     "winston": "^3.2.1"
   },

plugins/slack-catalog-backend/src/SlackUserProcessor.test.ts

@@ -5,6 +5,7 @@
 import { SystemEntity, UserEntity } from '@backstage/catalog-model';
 import { WebClient } from '@slack/web-api';
 import * as winston from 'winston';
+
 import { SlackUserProcessor } from './SlackUserProcessor';
 
 jest.mock('@slack/web-api', () => {

plugins/slack-catalog-backend/src/index.ts

@@ -3,3 +3,4 @@
  * Licensed under the terms of the Apache-2.0 license. See LICENSE file in project root for terms.
  */
 export { SlackUserProcessor } from './SlackUserProcessor';
+export { catalogModuleSlackUserProcessor as default } from './module';

plugins/slack-catalog-backend/src/module.ts

@@ -0,0 +1,43 @@
+/*
+ * Copyright SeatGeek
+ * Licensed under the terms of the Apache-2.0 license. See LICENSE file in project root for terms.
+ */
+import { loggerToWinstonLogger } from '@backstage/backend-common';
+import {
+  coreServices,
+  createBackendModule,
+} from '@backstage/backend-plugin-api';
+import { catalogProcessingExtensionPoint } from '@backstage/plugin-catalog-node/alpha';
+import { WebClient } from '@slack/web-api';
+
+import { SlackUserProcessor } from './SlackUserProcessor';
+
+export const catalogModuleSlackUserProcessor = createBackendModule({
+  pluginId: 'catalog', // name of the plugin that the module is targeting
+  moduleId: 'slack-catalog-backend',
+  register(env) {
+    env.registerInit({
+      deps: {
+        catalog: catalogProcessingExtensionPoint,
+        logger: coreServices.logger,
+        config: coreServices.rootConfig,
+      },
+      async init({ catalog, logger, config }) {
+        // Log warning if no token is set
+        const slackToken = config.getOptionalString('slackCatalog.token');
+        if (!slackToken) {
+          logger.warn(
+            'No token provided for SlackUserProcessor, skipping Slack user lookup',
+          );
+          return;
+        }
+        catalog.addProcessor(
+          new SlackUserProcessor(
+            new WebClient(slackToken),
+            loggerToWinstonLogger(logger),
+          ),
+        );
+      },
+    });
+  },
+});