barkey/packages/backend/src/services/i/update.ts

import renderUpdate from '@/remote/activitypub/renderer/update.js';
import { renderActivity } from '@/remote/activitypub/renderer/index.js';
import { Users } from '@/models/index.js';
import { User } from '@/models/entities/user.js';
import { renderPerson } from '@/remote/activitypub/renderer/person.js';
import { deliverToFollowers } from '@/remote/activitypub/deliver-manager.js';
import { deliverToRelays } from '../relay.js';

export async function publishToFollowers(userId: User['id']) {
	const user = await Users.findOneBy({ id: userId });
	if (user == null) throw new Error('user not found');

	// フォロワーがリモートユーザーかつ投稿者がローカルユーザーならUpdateを配信
	if (Users.isLocalUser(user)) {
		const content = renderActivity(renderUpdate(await renderPerson(user), user));
		deliverToFollowers(user, content);
		deliverToRelays(user, content);
	}
}