なんかもうめっちゃ変えた

packages/backend/src/core/AccountUpdateService.ts

@@ -0,0 +1,38 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { DI } from '@/di-symbols.js';
+import { UsersRepository } from '@/models/index.js';
+import { Config } from '@/config.js';
+import type { User } from '@/models/entities/User.js';
+import { ApRendererService } from '@/core/remote/activitypub/ApRendererService.js';
+import { RelayService } from '@/core/RelayService.js';
+import { ApDeliverManagerService } from '@/core/remote/activitypub/ApDeliverManagerService.js';
+import { UserEntityService } from './entities/UserEntityService.js';
+
+@Injectable()
+export class AccountUpdateService {
+	constructor(
+		@Inject(DI.config)
+		private config: Config,
+
+		@Inject(DI.usersRepository)
+		private usersRepository: UsersRepository,
+
+		private userEntityService: UserEntityService,
+		private apRendererService: ApRendererService,
+		private apDeliverManagerService: ApDeliverManagerService,
+		private relayService: RelayService,
+	) {
+	}
+
+	public async publishToFollowers(userId: User['id']) {
+		const user = await this.usersRepository.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 (this.userEntityService.isLocalUser(user)) {
+			const content = this.apRendererService.renderActivity(this.apRendererService.renderUpdate(await this.apRendererService.renderPerson(user), user));
+			this.apDeliverManagerService.deliverToFollowers(user, content);
+			this.relayService.deliverToRelays(user, content);
+		}
+	}
+}