整理した

src/models/post.ts

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+import * as mongo from 'mongodb';
+import deepcopy = require('deepcopy');
+import rap from '@prezzemolo/rap';
+import db from '../db/mongodb';
+import { IUser, pack as packUser } from './user';
+import { pack as packApp } from './app';
+import { pack as packChannel } from './channel';
+import Vote from './poll-vote';
+import Reaction from './post-reaction';
+import { pack as packFile } from './drive-file';
+import parse from '../common/text';
+
+const Post = db.get<IPost>('posts');
+
+export default Post;
+
+export function isValidText(text: string): boolean {
+	return text.length <= 1000 && text.trim() != '';
+}
+
+export type IPost = {
+	_id: mongo.ObjectID;
+	channelId: mongo.ObjectID;
+	createdAt: Date;
+	mediaIds: mongo.ObjectID[];
+	replyId: mongo.ObjectID;
+	repostId: mongo.ObjectID;
+	poll: any; // todo
+	text: string;
+	userId: mongo.ObjectID;
+	appId: mongo.ObjectID;
+	viaMobile: boolean;
+	repostCount: number;
+	repliesCount: number;
+	reactionCounts: any;
+	mentions: mongo.ObjectID[];
+	geo: {
+		coordinates: number[];
+		altitude: number;
+		accuracy: number;
+		altitudeAccuracy: number;
+		heading: number;
+		speed: number;
+	};
+};
+
+/**
+ * Pack a post for API response
+ *
+ * @param post target
+ * @param me? serializee
+ * @param options? serialize options
+ * @return response
+ */
+export const pack = async (
+	post: string | mongo.ObjectID | IPost,
+	me?: string | mongo.ObjectID | IUser,
+	options?: {
+		detail: boolean
+	}
+) => {
+	const opts = options || {
+		detail: true,
+	};
+
+	// Me
+	const meId: mongo.ObjectID = me
+		? mongo.ObjectID.prototype.isPrototypeOf(me)
+			? me as mongo.ObjectID
+			: typeof me === 'string'
+				? new mongo.ObjectID(me)
+				: (me as IUser)._id
+		: null;
+
+	let _post: any;
+
+	// Populate the post if 'post' is ID
+	if (mongo.ObjectID.prototype.isPrototypeOf(post)) {
+		_post = await Post.findOne({
+			_id: post
+		});
+	} else if (typeof post === 'string') {
+		_post = await Post.findOne({
+			_id: new mongo.ObjectID(post)
+		});
+	} else {
+		_post = deepcopy(post);
+	}
+
+	if (!_post) throw 'invalid post arg.';
+
+	const id = _post._id;
+
+	// Rename _id to id
+	_post.id = _post._id;
+	delete _post._id;
+
+	delete _post.mentions;
+	if (_post.geo) delete _post.geo.type;
+
+	// Parse text
+	if (_post.text) {
+		_post.ast = parse(_post.text);
+	}
+
+	// Populate user
+	_post.user = packUser(_post.userId, meId);
+
+	// Populate app
+	if (_post.appId) {
+		_post.app = packApp(_post.appId);
+	}
+
+	// Populate channel
+	if (_post.channelId) {
+		_post.channel = packChannel(_post.channelId);
+	}
+
+	// Populate media
+	if (_post.mediaIds) {
+		_post.media = Promise.all(_post.mediaIds.map(fileId =>
+			packFile(fileId)
+		));
+	}
+
+	// When requested a detailed post data
+	if (opts.detail) {
+		// Get previous post info
+		_post.prev = (async () => {
+			const prev = await Post.findOne({
+				userId: _post.userId,
+				_id: {
+					$lt: id
+				}
+			}, {
+				fields: {
+					_id: true
+				},
+				sort: {
+					_id: -1
+				}
+			});
+			return prev ? prev._id : null;
+		})();
+
+		// Get next post info
+		_post.next = (async () => {
+			const next = await Post.findOne({
+				userId: _post.userId,
+				_id: {
+					$gt: id
+				}
+			}, {
+				fields: {
+					_id: true
+				},
+				sort: {
+					_id: 1
+				}
+			});
+			return next ? next._id : null;
+		})();
+
+		if (_post.replyId) {
+			// Populate reply to post
+			_post.reply = pack(_post.replyId, meId, {
+				detail: false
+			});
+		}
+
+		if (_post.repostId) {
+			// Populate repost
+			_post.repost = pack(_post.repostId, meId, {
+				detail: _post.text == null
+			});
+		}
+
+		// Poll
+		if (meId && _post.poll) {
+			_post.poll = (async (poll) => {
+				const vote = await Vote
+					.findOne({
+						userId: meId,
+						postId: id
+					});
+
+				if (vote != null) {
+					const myChoice = poll.choices
+						.filter(c => c.id == vote.choice)[0];
+
+					myChoice.isVoted = true;
+				}
+
+				return poll;
+			})(_post.poll);
+		}
+
+		// Fetch my reaction
+		if (meId) {
+			_post.myReaction = (async () => {
+				const reaction = await Reaction
+					.findOne({
+						userId: meId,
+						postId: id,
+						deletedAt: { $exists: false }
+					});
+
+				if (reaction) {
+					return reaction.reaction;
+				}
+
+				return null;
+			})();
+		}
+	}
+
+	// resolve promises in _post object
+	_post = await rap(_post);
+
+	return _post;
+};