なんかもうめっちゃ変えた

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

@@ -0,0 +1,57 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { DI } from '@/di-symbols.js';
+import { MessagingMessagesRepository } 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 { MessagingMessage } from '@/models/entities/MessagingMessage.js';
+import { UserEntityService } from './UserEntityService.js';
+import { DriveFileEntityService } from './DriveFileEntityService.js';
+import { UserGroupEntityService } from './UserGroupEntityService.js';
+
+@Injectable()
+export class MessagingMessageEntityService {
+	constructor(
+		@Inject(DI.messagingMessagesRepository)
+		private messagingMessagesRepository: MessagingMessagesRepository,
+
+		private userEntityService: UserEntityService,
+		private userGroupEntityService: UserGroupEntityService,
+		private driveFileEntityService: DriveFileEntityService,
+	) {
+	}
+
+	public async pack(
+		src: MessagingMessage['id'] | MessagingMessage,
+		me?: { id: User['id'] } | null | undefined,
+		options?: {
+			populateRecipient?: boolean,
+			populateGroup?: boolean,
+		},
+	): Promise<Packed<'MessagingMessage'>> {
+		const opts = options ?? {
+			populateRecipient: true,
+			populateGroup: true,
+		};
+
+		const message = typeof src === 'object' ? src : await this.messagingMessagesRepository.findOneByOrFail({ id: src });
+
+		return {
+			id: message.id,
+			createdAt: message.createdAt.toISOString(),
+			text: message.text,
+			userId: message.userId,
+			user: await this.userEntityService.pack(message.user ?? message.userId, me),
+			recipientId: message.recipientId,
+			recipient: message.recipientId && opts.populateRecipient ? await this.userEntityService.pack(message.recipient ?? message.recipientId, me) : undefined,
+			groupId: message.groupId,
+			group: message.groupId && opts.populateGroup ? await this.userGroupEntityService.pack(message.group ?? message.groupId) : undefined,
+			fileId: message.fileId,
+			file: message.fileId ? await this.driveFileEntityService.pack(message.fileId) : null,
+			isRead: message.isRead,
+			reads: message.reads,
+		};
+	}
+}
+