feat: Add support for the Notification specification

test/unit/server/notifications/generate/ActivityNotificationGenerator.test.ts

@@ -0,0 +1,67 @@
+import { BasicRepresentation } from '../../../../../src/http/representation/BasicRepresentation';
+import { RepresentationMetadata } from '../../../../../src/http/representation/RepresentationMetadata';
+import type { ResourceIdentifier } from '../../../../../src/http/representation/ResourceIdentifier';
+import {
+  ActivityNotificationGenerator,
+} from '../../../../../src/server/notifications/generate/ActivityNotificationGenerator';
+import type { SubscriptionInfo } from '../../../../../src/server/notifications/SubscriptionStorage';
+import type { ResourceStore } from '../../../../../src/storage/ResourceStore';
+import { AS, DC, LDP, RDF } from '../../../../../src/util/Vocabularies';
+
+describe('An ActivityNotificationGenerator', (): void => {
+  const topic: ResourceIdentifier = { path: 'http://example.com/foo' };
+  const info: SubscriptionInfo = {
+    id: 'id',
+    topic: topic.path,
+    type: 'type',
+    features: {},
+    lastEmit: 0,
+  };
+  const activity = AS.terms.Update;
+  const metadata = new RepresentationMetadata({
+    [RDF.type]: LDP.terms.Resource,
+    // Needed for ETag
+    [DC.modified]: new Date().toISOString(),
+  });
+  let store: jest.Mocked<ResourceStore>;
+  let generator: ActivityNotificationGenerator;
+
+  beforeEach(async(): Promise<void> => {
+    store = {
+      getRepresentation: jest.fn().mockResolvedValue(new BasicRepresentation('', metadata)),
+    } as any;
+
+    generator = new ActivityNotificationGenerator(store);
+  });
+
+  it('only handles defined activities.', async(): Promise<void> => {
+    await expect(generator.canHandle({ topic, info })).rejects.toThrow('Only defined activities are supported.');
+    await expect(generator.canHandle({ topic, info, activity })).resolves.toBeUndefined();
+  });
+
+  it('generates a notification.', async(): Promise<void> => {
+    const date = '1988-03-09T14:48:00.000Z';
+    const ms = Date.parse(date);
+    jest.useFakeTimers();
+    jest.setSystemTime(ms);
+
+    await expect(generator.handle({ topic, info, activity })).resolves.toEqual({
+      '@context': [
+        'https://www.w3.org/ns/activitystreams',
+        'https://www.w3.org/ns/solid/notification/v1',
+      ],
+      id: `urn:${ms}:http://example.com/foo`,
+      type: [ 'Update' ],
+      object: {
+        id: 'http://example.com/foo',
+        type: [
+          LDP.Resource,
+        ],
+      },
+      state: expect.stringMatching(/"\d+"/u),
+      published: date,
+    });
+
+    jest.useRealTimers();
+  });
+});