refactoring

Resolve #7779

packages/backend/src/remote/activitypub/kernel/follow.ts

@@ -0,0 +1,20 @@
+import { IRemoteUser } from '@/models/entities/user';
+import follow from '@/services/following/create';
+import { IFollow } from '../type';
+import DbResolver from '../db-resolver';
+
+export default async (actor: IRemoteUser, activity: IFollow): Promise<string> => {
+	const dbResolver = new DbResolver();
+	const followee = await dbResolver.getUserFromApId(activity.object);
+
+	if (followee == null) {
+		return `skip: followee not found`;
+	}
+
+	if (followee.host != null) {
+		return `skip: フォローしようとしているユーザーはローカルユーザーではありません`;
+	}
+
+	await follow(actor, followee, activity.id);
+	return `ok`;
+};