なんかもうめっちゃ変えた

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

@@ -0,0 +1,66 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { DI } from '@/di-symbols.js';
+import { ChannelFollowingsRepository, ChannelsRepository, DriveFilesRepository, NoteUnreadsRepository } 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 { Channel } from '@/models/entities/Channel.js';
+import { UserEntityService } from './UserEntityService.js';
+import { DriveFileEntityService } from './DriveFileEntityService.js';
+
+@Injectable()
+export class ChannelEntityService {
+	constructor(
+		@Inject(DI.channelsRepository)
+		private channelsRepository: ChannelsRepository,
+
+		@Inject(DI.channelFollowingsRepository)
+		private channelFollowingsRepository: ChannelFollowingsRepository,
+
+		@Inject(DI.noteUnreadsRepository)
+		private noteUnreadsRepository: NoteUnreadsRepository,
+
+		@Inject(DI.driveFilesRepository)
+		private driveFilesRepository: DriveFilesRepository,
+
+		private userEntityService: UserEntityService,
+		private driveFileEntityService: DriveFileEntityService,
+	) {
+	}
+
+	public async pack(
+		src: Channel['id'] | Channel,
+		me?: { id: User['id'] } | null | undefined,
+	): Promise<Packed<'Channel'>> {
+		const channel = typeof src === 'object' ? src : await this.channelsRepository.findOneByOrFail({ id: src });
+		const meId = me ? me.id : null;
+
+		const banner = channel.bannerId ? await this.driveFilesRepository.findOneBy({ id: channel.bannerId }) : null;
+
+		const hasUnreadNote = meId ? (await this.noteUnreadsRepository.findOneBy({ noteChannelId: channel.id, userId: meId })) != null : undefined;
+
+		const following = meId ? await this.channelFollowingsRepository.findOneBy({
+			followerId: meId,
+			followeeId: channel.id,
+		}) : null;
+
+		return {
+			id: channel.id,
+			createdAt: channel.createdAt.toISOString(),
+			lastNotedAt: channel.lastNotedAt ? channel.lastNotedAt.toISOString() : null,
+			name: channel.name,
+			description: channel.description,
+			userId: channel.userId,
+			bannerUrl: banner ? this.driveFileEntityService.getPublicUrl(banner, false) : null,
+			usersCount: channel.usersCount,
+			notesCount: channel.notesCount,
+
+			...(me ? {
+				isFollowing: following != null,
+				hasUnreadNote,
+			} : {}),
+		};
+	}
+}
+