整理した

src/models/messaging-message.ts

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+import * as mongo from 'mongodb';
+import deepcopy = require('deepcopy');
+import { pack as packUser } from './user';
+import { pack as packFile } from './drive-file';
+import db from '../db/mongodb';
+import parse from '../common/text';
+
+const MessagingMessage = db.get<IMessagingMessage>('messagingMessages');
+export default MessagingMessage;
+
+export interface IMessagingMessage {
+	_id: mongo.ObjectID;
+	createdAt: Date;
+	text: string;
+	userId: mongo.ObjectID;
+	recipientId: mongo.ObjectID;
+	isRead: boolean;
+	fileId: mongo.ObjectID;
+}
+
+export function isValidText(text: string): boolean {
+	return text.length <= 1000 && text.trim() != '';
+}
+
+/**
+ * Pack a messaging message for API response
+ *
+ * @param {any} message
+ * @param {any} me?
+ * @param {any} options?
+ * @return {Promise<any>}
+ */
+export const pack = (
+	message: any,
+	me?: any,
+	options?: {
+		populateRecipient: boolean
+	}
+) => new Promise<any>(async (resolve, reject) => {
+	const opts = options || {
+		populateRecipient: true
+	};
+
+	let _message: any;
+
+	// Populate the message if 'message' is ID
+	if (mongo.ObjectID.prototype.isPrototypeOf(message)) {
+		_message = await MessagingMessage.findOne({
+			_id: message
+		});
+	} else if (typeof message === 'string') {
+		_message = await MessagingMessage.findOne({
+			_id: new mongo.ObjectID(message)
+		});
+	} else {
+		_message = deepcopy(message);
+	}
+
+	// Rename _id to id
+	_message.id = _message._id;
+	delete _message._id;
+
+	// Parse text
+	if (_message.text) {
+		_message.ast = parse(_message.text);
+	}
+
+	// Populate user
+	_message.user = await packUser(_message.userId, me);
+
+	if (_message.fileId) {
+		// Populate file
+		_message.file = await packFile(_message.fileId);
+	}
+
+	if (opts.populateRecipient) {
+		// Populate recipient
+		_message.recipient = await packUser(_message.recipientId, me);
+	}
+
+	resolve(_message);
+});