なんかもうめっちゃ変えた

packages/backend/src/core/entities/FollowingEntityService.ts

@@ -0,0 +1,98 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { DI } from '@/di-symbols.js';
+import { FollowingsRepository } from '@/models/index.js';
+import { awaitAll } from '@/misc/prelude/await-all.js';
+import type { Packed } from '@/misc/schema.js';
+import type { } from '@/models/entities/Blocking.js';
+import type { User } from '@/models/entities/User.js';
+import type { Following } from '@/models/entities/Following.js';
+import { UserEntityService } from './UserEntityService.js';
+
+type LocalFollowerFollowing = Following & {
+	followerHost: null;
+	followerInbox: null;
+	followerSharedInbox: null;
+};
+
+type RemoteFollowerFollowing = Following & {
+	followerHost: string;
+	followerInbox: string;
+	followerSharedInbox: string;
+};
+
+type LocalFolloweeFollowing = Following & {
+	followeeHost: null;
+	followeeInbox: null;
+	followeeSharedInbox: null;
+};
+
+type RemoteFolloweeFollowing = Following & {
+	followeeHost: string;
+	followeeInbox: string;
+	followeeSharedInbox: string;
+};
+
+@Injectable()
+export class FollowingEntityService {
+	constructor(
+		@Inject(DI.followingsRepository)
+		private followingsRepository: FollowingsRepository,
+
+		private userEntityService: UserEntityService,
+	) {
+	}
+
+	public isLocalFollower(following: Following): following is LocalFollowerFollowing {
+		return following.followerHost == null;
+	}
+
+	public isRemoteFollower(following: Following): following is RemoteFollowerFollowing {
+		return following.followerHost != null;
+	}
+
+	public isLocalFollowee(following: Following): following is LocalFolloweeFollowing {
+		return following.followeeHost == null;
+	}
+
+	public isRemoteFollowee(following: Following): following is RemoteFolloweeFollowing {
+		return following.followeeHost != null;
+	}
+
+	public async pack(
+		src: Following['id'] | Following,
+		me?: { id: User['id'] } | null | undefined,
+		opts?: {
+			populateFollowee?: boolean;
+			populateFollower?: boolean;
+		},
+	): Promise<Packed<'Following'>> {
+		const following = typeof src === 'object' ? src : await this.followingsRepository.findOneByOrFail({ id: src });
+
+		if (opts == null) opts = {};
+
+		return await awaitAll({
+			id: following.id,
+			createdAt: following.createdAt.toISOString(),
+			followeeId: following.followeeId,
+			followerId: following.followerId,
+			followee: opts.populateFollowee ? this.userEntityService.pack(following.followee ?? following.followeeId, me, {
+				detail: true,
+			}) : undefined,
+			follower: opts.populateFollower ? this.userEntityService.pack(following.follower ?? following.followerId, me, {
+				detail: true,
+			}) : undefined,
+		});
+	}
+
+	public packMany(
+		followings: any[],
+		me?: { id: User['id'] } | null | undefined,
+		opts?: {
+			populateFollowee?: boolean;
+			populateFollower?: boolean;
+		},
+	) {
+		return Promise.all(followings.map(x => this.pack(x, me, opts)));
+	}
+}
+