Implement unfollow by remote account

src/remote/activitypub/act/undo/index.ts

@@ -0,0 +1,23 @@
+import act from '../../act';
+import unfollow from './unfollow';
+
+export default async (resolver, actor, activity) => {
+	if ('actor' in activity && actor.account.uri !== activity.actor) {
+		throw new Error();
+	}
+
+	const results = await act(resolver, actor, activity.object);
+
+	await Promise.all(results.map(async result => {
+		if (result === null) {
+			return;
+		}
+
+		switch (result.object.$ref) {
+		case 'following':
+			await unfollow(result.resolver, result.object);
+		}
+	}));
+
+	return null;
+};