Merge branch 'master' into greenkeeper/@types/rimraf-2.0.2

64 files changed, 2095 insertions, 369 deletions

diff --git a/src/api/authenticate.ts b/src/api/authenticate.ts
index d4cc3fc41f..b289959ac1 100644
--- a/src/api/authenticate.ts
+++ b/src/api/authenticate.ts
@@ -1,6 +1,6 @@
 import * as express from 'express';
 import App from './models/app';
-import User from './models/user';
+import { default as User, IUser } from './models/user';
 import AccessToken from './models/access-token';
 import isNativeToken from './common/is-native-token';
 
@@ -13,10 +13,10 @@ export interface IAuthContext {
 	/**
 	 * Authenticated user
 	 */
-	user: any;
+	user: IUser;
 
 	/**
-	 * Weather if the request is via the User-Native Token or not
+	 * Whether requested with a User-Native Token
 	 */
 	isSecure: boolean;
 }
@@ -25,11 +25,15 @@ export default (req: express.Request) => new Promise<IAuthContext>(async (resolv
 	const token = req.body['i'] as string;
 
 	if (token == null) {
-		return resolve({ app: null, user: null, isSecure: false });
+		return resolve({
+			app: null,
+			user: null,
+			isSecure: false
+		});
 	}
 
 	if (isNativeToken(token)) {
-		const user = await User
+		const user: IUser = await User
 			.findOne({ token: token });
 
 		if (user === null) {
@@ -56,6 +60,10 @@ export default (req: express.Request) => new Promise<IAuthContext>(async (resolv
 		const user = await User
 			.findOne({ _id: accessToken.user_id });
 
-		return resolve({ app: app, user: user, isSecure: false });
+		return resolve({
+			app: app,
+			user: user,
+			isSecure: false
+		});
 	}
 });
diff --git a/src/api/bot/core.ts b/src/api/bot/core.ts
new file mode 100644
index 0000000000..53fb18119e
--- /dev/null
+++ b/src/api/bot/core.ts
@@ -0,0 +1,398 @@
+import * as EventEmitter from 'events';
+import * as bcrypt from 'bcryptjs';
+
+import User, { IUser, init as initUser } from '../models/user';
+
+import getPostSummary from '../../common/get-post-summary';
+import getUserSummary from '../../common/get-user-summary';
+
+import Othello, { ai as othelloAi } from '../../common/othello';
+
+const hmm = [
+	'？',
+	'ふぅ～む...？',
+	'ちょっと何言ってるかわからないです',
+	'「ヘルプ」と言うと利用可能な操作が確認できますよ'
+];
+
+/**
+ * Botの頭脳
+ */
+export default class BotCore extends EventEmitter {
+	public user: IUser = null;
+
+	private context: Context = null;
+
+	constructor(user?: IUser) {
+		super();
+
+		this.user = user;
+	}
+
+	public clearContext() {
+		this.setContext(null);
+	}
+
+	public setContext(context: Context) {
+		this.context = context;
+		this.emit('updated');
+
+		if (context) {
+			context.on('updated', () => {
+				this.emit('updated');
+			});
+		}
+	}
+
+	public export() {
+		return {
+			user: this.user,
+			context: this.context ? this.context.export() : null
+		};
+	}
+
+	protected _import(data) {
+		this.user = data.user ? initUser(data.user) : null;
+		this.setContext(data.context ? Context.import(this, data.context) : null);
+	}
+
+	public static import(data) {
+		const bot = new BotCore();
+		bot._import(data);
+		return bot;
+	}
+
+	public async q(query: string): Promise<string | void> {
+		if (this.context != null) {
+			return await this.context.q(query);
+		}
+
+		if (/^@[a-zA-Z0-9-]+$/.test(query)) {
+			return await this.showUserCommand(query);
+		}
+
+		switch (query) {
+			case 'ping':
+				return 'PONG';
+
+			case 'help':
+			case 'ヘルプ':
+				return '利用可能なコマンド一覧です:\n' +
+					'help: これです\n' +
+					'me: アカウント情報を見ます\n' +
+					'login, signin: サインインします\n' +
+					'logout, signout: サインアウトします\n' +
+					'post: 投稿します\n' +
+					'tl: タイムラインを見ます\n' +
+					'@<ユーザー名>: ユーザーを表示します';
+
+			case 'me':
+				return this.user ? `${this.user.name}としてサインインしています。\n\n${getUserSummary(this.user)}` : 'サインインしていません';
+
+			case 'login':
+			case 'signin':
+			case 'ログイン':
+			case 'サインイン':
+				if (this.user != null) return '既にサインインしていますよ！';
+				this.setContext(new SigninContext(this));
+				return await this.context.greet();
+
+			case 'logout':
+			case 'signout':
+			case 'ログアウト':
+			case 'サインアウト':
+				if (this.user == null) return '今はサインインしてないですよ！';
+				this.signout();
+				return 'ご利用ありがとうございました <3';
+
+			case 'post':
+			case '投稿':
+				if (this.user == null) return 'まずサインインしてください。';
+				this.setContext(new PostContext(this));
+				return await this.context.greet();
+
+			case 'tl':
+			case 'タイムライン':
+				return await this.tlCommand();
+
+			case 'guessing-game':
+			case '数当てゲーム':
+				this.setContext(new GuessingGameContext(this));
+				return await this.context.greet();
+
+			case 'othello':
+			case 'オセロ':
+				this.setContext(new OthelloContext(this));
+				return await this.context.greet();
+
+			default:
+				return hmm[Math.floor(Math.random() * hmm.length)];
+		}
+	}
+
+	public signin(user: IUser) {
+		this.user = user;
+		this.emit('signin', user);
+		this.emit('updated');
+	}
+
+	public signout() {
+		const user = this.user;
+		this.user = null;
+		this.emit('signout', user);
+		this.emit('updated');
+	}
+
+	public async refreshUser() {
+		this.user = await User.findOne({
+			_id: this.user._id
+		}, {
+			fields: {
+				data: false
+			}
+		});
+
+		this.emit('updated');
+	}
+
+	public async tlCommand(): Promise<string | void> {
+		if (this.user == null) return 'まずサインインしてください。';
+
+		const tl = await require('../endpoints/posts/timeline')({
+			limit: 5
+		}, this.user);
+
+		const text = tl
+			.map(post => getPostSummary(post))
+			.join('\n-----\n');
+
+		return text;
+	}
+
+	public async showUserCommand(q: string): Promise<string | void> {
+		try {
+			const user = await require('../endpoints/users/show')({
+				username: q.substr(1)
+			}, this.user);
+
+			const text = getUserSummary(user);
+
+			return text;
+		} catch (e) {
+			return `問題が発生したようです...: ${e}`;
+		}
+	}
+}
+
+abstract class Context extends EventEmitter {
+	protected bot: BotCore;
+
+	public abstract async greet(): Promise<string>;
+	public abstract async q(query: string): Promise<string>;
+	public abstract export(): any;
+
+	constructor(bot: BotCore) {
+		super();
+		this.bot = bot;
+	}
+
+	public static import(bot: BotCore, data: any) {
+		if (data.type == 'guessing-game') return GuessingGameContext.import(bot, data.content);
+		if (data.type == 'othello') return OthelloContext.import(bot, data.content);
+		if (data.type == 'post') return PostContext.import(bot, data.content);
+		if (data.type == 'signin') return SigninContext.import(bot, data.content);
+		return null;
+	}
+}
+
+class SigninContext extends Context {
+	private temporaryUser: IUser = null;
+
+	public async greet(): Promise<string> {
+		return 'まずユーザー名を教えてください:';
+	}
+
+	public async q(query: string): Promise<string> {
+		if (this.temporaryUser == null) {
+			// Fetch user
+			const user: IUser = await User.findOne({
+				username_lower: query.toLowerCase()
+			}, {
+				fields: {
+					data: false
+				}
+			});
+
+			if (user === null) {
+				return `${query}というユーザーは存在しませんでした... もう一度教えてください:`;
+			} else {
+				this.temporaryUser = user;
+				this.emit('updated');
+				return `パスワードを教えてください:`;
+			}
+		} else {
+			// Compare password
+			const same = bcrypt.compareSync(query, this.temporaryUser.password);
+
+			if (same) {
+				this.bot.signin(this.temporaryUser);
+				this.bot.clearContext();
+				return `${this.temporaryUser.name}さん、おかえりなさい！`;
+			} else {
+				return `パスワードが違います... もう一度教えてください:`;
+			}
+		}
+	}
+
+	public export() {
+		return {
+			type: 'signin',
+			content: {
+				temporaryUser: this.temporaryUser
+			}
+		};
+	}
+
+	public static import(bot: BotCore, data: any) {
+		const context = new SigninContext(bot);
+		context.temporaryUser = data.temporaryUser;
+		return context;
+	}
+}
+
+class PostContext extends Context {
+	public async greet(): Promise<string> {
+		return '内容:';
+	}
+
+	public async q(query: string): Promise<string> {
+		await require('../endpoints/posts/create')({
+			text: query
+		}, this.bot.user);
+		this.bot.clearContext();
+		return '投稿しましたよ！';
+	}
+
+	public export() {
+		return {
+			type: 'post'
+		};
+	}
+
+	public static import(bot: BotCore, data: any) {
+		const context = new PostContext(bot);
+		return context;
+	}
+}
+
+class GuessingGameContext extends Context {
+	private secret: number;
+	private history: number[] = [];
+
+	public async greet(): Promise<string> {
+		this.secret = Math.floor(Math.random() * 100);
+		this.emit('updated');
+		return '0~100の秘密の数を当ててみてください:';
+	}
+
+	public async q(query: string): Promise<string> {
+		if (query == 'やめる') {
+			this.bot.clearContext();
+			return 'やめました。';
+		}
+
+		const guess = parseInt(query, 10);
+
+		if (isNaN(guess)) {
+			return '整数で推測してください。「やめる」と言うとゲームをやめます。';
+		}
+
+		const firsttime = this.history.indexOf(guess) === -1;
+
+		this.history.push(guess);
+		this.emit('updated');
+
+		if (this.secret < guess) {
+			return firsttime ? `${guess}よりも小さいですね` : `もう一度言いますが${guess}より小さいですよ`;
+		} else if (this.secret > guess) {
+			return firsttime ? `${guess}よりも大きいですね` : `もう一度言いますが${guess}より大きいですよ`;
+		} else {
+			this.bot.clearContext();
+			return `正解です🎉 (${this.history.length}回目で当てました)`;
+		}
+	}
+
+	public export() {
+		return {
+			type: 'guessing-game',
+			content: {
+				secret: this.secret,
+				history: this.history
+			}
+		};
+	}
+
+	public static import(bot: BotCore, data: any) {
+		const context = new GuessingGameContext(bot);
+		context.secret = data.secret;
+		context.history = data.history;
+		return context;
+	}
+}
+
+class OthelloContext extends Context {
+	private othello: Othello = null;
+
+	constructor(bot: BotCore) {
+		super(bot);
+
+		this.othello = new Othello();
+	}
+
+	public async greet(): Promise<string> {
+		return this.othello.toPatternString('black');
+	}
+
+	public async q(query: string): Promise<string> {
+		if (query == 'やめる') {
+			this.bot.clearContext();
+			return 'オセロをやめました。';
+		}
+
+		const n = parseInt(query, 10);
+
+		if (isNaN(n)) {
+			return '番号で指定してください。「やめる」と言うとゲームをやめます。';
+		}
+
+		this.othello.setByNumber('black', n);
+		const s = this.othello.toString() + '\n\n...(AI)...\n\n';
+		othelloAi('white', this.othello);
+		if (this.othello.getPattern('black').length === 0) {
+			this.bot.clearContext();
+			const blackCount = this.othello.board.map(row => row.filter(s => s == 'black').length).reduce((a, b) => a + b);
+			const whiteCount = this.othello.board.map(row => row.filter(s => s == 'white').length).reduce((a, b) => a + b);
+			const winner = blackCount == whiteCount ? '引き分け' : blackCount > whiteCount ? '黒の勝ち' : '白の勝ち';
+			return this.othello.toString() + `\n\n～終了～\n\n黒${blackCount}、白${whiteCount}で${winner}です。`;
+		} else {
+			this.emit('updated');
+			return s + this.othello.toPatternString('black');
+		}
+	}
+
+	public export() {
+		return {
+			type: 'othello',
+			content: {
+				board: this.othello.board
+			}
+		};
+	}
+
+	public static import(bot: BotCore, data: any) {
+		const context = new OthelloContext(bot);
+		context.othello = new Othello();
+		context.othello.board = data.board;
+		return context;
+	}
+}
diff --git a/src/api/bot/interfaces/line.ts b/src/api/bot/interfaces/line.ts
new file mode 100644
index 0000000000..0caa71ed2b
--- /dev/null
+++ b/src/api/bot/interfaces/line.ts
@@ -0,0 +1,234 @@
+import * as EventEmitter from 'events';
+import * as express from 'express';
+import * as request from 'request';
+import * as crypto from 'crypto';
+import User from '../../models/user';
+import config from '../../../conf';
+import BotCore from '../core';
+import _redis from '../../../db/redis';
+import prominence = require('prominence');
+import getPostSummary from '../../../common/get-post-summary';
+
+const redis = prominence(_redis);
+
+// SEE: https://developers.line.me/media/messaging-api/messages/sticker_list.pdf
+const stickers = [
+	'297',
+	'298',
+	'299',
+	'300',
+	'301',
+	'302',
+	'303',
+	'304',
+	'305',
+	'306',
+	'307'
+];
+
+class LineBot extends BotCore {
+	private replyToken: string;
+
+	private reply(messages: any[]) {
+		request.post({
+			url: 'https://api.line.me/v2/bot/message/reply',
+			headers: {
+				'Authorization': `Bearer ${config.line_bot.channel_access_token}`
+			},
+			json: {
+				replyToken: this.replyToken,
+				messages: messages
+			}
+		}, (err, res, body) => {
+			if (err) {
+				console.error(err);
+				return;
+			}
+		});
+	}
+
+	public async react(ev: any): Promise<void> {
+		this.replyToken = ev.replyToken;
+
+		switch (ev.type) {
+			// メッセージ
+			case 'message':
+				switch (ev.message.type) {
+					// テキスト
+					case 'text':
+						const res = await this.q(ev.message.text);
+						if (res == null) return;
+						// 返信
+						this.reply([{
+							type: 'text',
+							text: res
+						}]);
+						break;
+
+					// スタンプ
+					case 'sticker':
+						// スタンプで返信
+						this.reply([{
+							type: 'sticker',
+							packageId: '4',
+							stickerId: stickers[Math.floor(Math.random() * stickers.length)]
+						}]);
+						break;
+				}
+				break;
+
+			// postback
+			case 'postback':
+				const data = ev.postback.data;
+				const cmd = data.split('|')[0];
+				const arg = data.split('|')[1];
+				switch (cmd) {
+					case 'showtl':
+						this.showUserTimelinePostback(arg);
+						break;
+				}
+				break;
+		}
+	}
+
+	public static import(data) {
+		const bot = new LineBot();
+		bot._import(data);
+		return bot;
+	}
+
+	public async showUserCommand(q: string) {
+		const user = await require('../../endpoints/users/show')({
+			username: q.substr(1)
+		}, this.user);
+
+		const actions = [];
+
+		actions.push({
+			type: 'postback',
+			label: 'タイムラインを見る',
+			data: `showtl|${user.id}`
+		});
+
+		if (user.twitter) {
+			actions.push({
+				type: 'uri',
+				label: 'Twitterアカウントを見る',
+				uri: `https://twitter.com/${user.twitter.screen_name}`
+			});
+		}
+
+		actions.push({
+			type: 'uri',
+			label: 'Webで見る',
+			uri: `${config.url}/${user.username}`
+		});
+
+		this.reply([{
+			type: 'template',
+			altText: await super.showUserCommand(q),
+			template: {
+				type: 'buttons',
+				thumbnailImageUrl: `${user.avatar_url}?thumbnail&size=1024`,
+				title: `${user.name} (@${user.username})`,
+				text: user.description || '(no description)',
+				actions: actions
+			}
+		}]);
+	}
+
+	public async showUserTimelinePostback(userId: string) {
+		const tl = await require('../../endpoints/users/posts')({
+			user_id: userId,
+			limit: 5
+		}, this.user);
+
+		const text = `${tl[0].user.name}さんのタイムラインはこちらです:\n\n` + tl
+			.map(post => getPostSummary(post))
+			.join('\n-----\n');
+
+		this.reply([{
+			type: 'text',
+			text: text
+		}]);
+	}
+}
+
+module.exports = async (app: express.Application) => {
+	if (config.line_bot == null) return;
+
+	const handler = new EventEmitter();
+
+	handler.on('event', async (ev) => {
+
+		const sourceId = ev.source.userId;
+		const sessionId = `line-bot-sessions:${sourceId}`;
+
+		const session = await redis.get(sessionId);
+		let bot: LineBot;
+
+		if (session == null) {
+			const user = await User.findOne({
+				line: {
+					user_id: sourceId
+				}
+			});
+
+			bot = new LineBot(user);
+
+			bot.on('signin', user => {
+				User.update(user._id, {
+					$set: {
+						line: {
+							user_id: sourceId
+						}
+					}
+				});
+			});
+
+			bot.on('signout', user => {
+				User.update(user._id, {
+					$set: {
+						line: {
+							user_id: null
+						}
+					}
+				});
+			});
+
+			redis.set(sessionId, JSON.stringify(bot.export()));
+		} else {
+			bot = LineBot.import(JSON.parse(session));
+		}
+
+		bot.on('updated', () => {
+			redis.set(sessionId, JSON.stringify(bot.export()));
+		});
+
+		if (session != null) bot.refreshUser();
+
+		bot.react(ev);
+	});
+
+	app.post('/hooks/line', (req, res, next) => {
+		// req.headers['x-line-signature'] は常に string ですが、型定義の都合上
+		// string | string[] になっているので string を明示しています
+		const sig1 = req.headers['x-line-signature'] as string;
+
+		const hash = crypto.createHmac('SHA256', config.line_bot.channel_secret)
+			.update((req as any).rawBody);
+
+		const sig2 = hash.digest('base64');
+
+		// シグネチャ比較
+		if (sig1 === sig2) {
+			req.body.events.forEach(ev => {
+				handler.emit('event', ev);
+			});
+
+			res.sendStatus(200);
+		} else {
+			res.sendStatus(400);
+		}
+	});
+};
diff --git a/src/api/common/add-file-to-drive.ts b/src/api/common/add-file-to-drive.ts
index 714eeb520d..f9c22ccacd 100644
--- a/src/api/common/add-file-to-drive.ts
+++ b/src/api/common/add-file-to-drive.ts
@@ -4,14 +4,27 @@ import * as gm from 'gm';
 import * as debug from 'debug';
 import fileType = require('file-type');
 import prominence = require('prominence');
-import DriveFile from '../models/drive-file';
+import DriveFile, { getGridFSBucket } from '../models/drive-file';
 import DriveFolder from '../models/drive-folder';
 import serialize from '../serializers/drive-file';
 import event from '../event';
 import config from '../../conf';
+import { Duplex } from 'stream';
 
 const log = debug('misskey:register-drive-file');
 
+const addToGridFS = (name, binary, metadata): Promise<any> => new Promise(async (resolve, reject) => {
+	const dataStream = new Duplex();
+	dataStream.push(binary);
+	dataStream.push(null);
+
+	const bucket = await getGridFSBucket();
+	const writeStream = bucket.openUploadStream(name, { metadata });
+	writeStream.once('finish', (doc) => { resolve(doc); });
+	writeStream.on('error', reject);
+	dataStream.pipe(writeStream);
+});
+
 /**
  * Add file to drive
  *
@@ -58,7 +71,7 @@ export default (
 
 	// Generate hash
 	const hash = crypto
-		.createHash('sha256')
+		.createHash('md5')
 		.update(data)
 		.digest('hex') as string;
 
@@ -67,8 +80,8 @@ export default (
 	if (!force) {
 		// Check if there is a file with the same hash
 		const much = await DriveFile.findOne({
-			user_id: user._id,
-			hash: hash
+			md5: hash,
+			'metadata.user_id': user._id
 		});
 
 		if (much !== null) {
@@ -82,13 +95,13 @@ export default (
 	// Calculate drive usage
 	const usage = ((await DriveFile
 		.aggregate([
-			{ $match: { user_id: user._id } },
+			{ $match: { 'metadata.user_id': user._id } },
 			{ $project: {
-				datasize: true
+				length: true
 			}},
 			{ $group: {
 				_id: null,
-				usage: { $sum: '$datasize' }
+				usage: { $sum: '$length' }
 			}}
 		]))[0] || {
 			usage: 0
@@ -131,21 +144,15 @@ export default (
 	}
 
 	// Create DriveFile document
-	const file = await DriveFile.insert({
-		created_at: new Date(),
+	const file = await addToGridFS(`${user._id}/${name}`, data, {
 		user_id: user._id,
 		folder_id: folder !== null ? folder._id : null,
-		data: data,
-		datasize: size,
 		type: mime,
 		name: name,
 		comment: comment,
-		hash: hash,
 		properties: properties
 	});
 
-	delete file.data;
-
 	log(`drive file has been created ${file._id}`);
 
 	resolve(file);
diff --git a/src/api/common/generate-native-user-token.ts b/src/api/common/generate-native-user-token.ts
new file mode 100644
index 0000000000..2082b89a5a
--- /dev/null
+++ b/src/api/common/generate-native-user-token.ts
@@ -0,0 +1,3 @@
+import rndstr from 'rndstr';
+
+export default () => `!${rndstr('a-zA-Z0-9', 32)}`;
diff --git a/src/api/common/read-notification.ts b/src/api/common/read-notification.ts
new file mode 100644
index 0000000000..3009cc5d08
--- /dev/null
+++ b/src/api/common/read-notification.ts
@@ -0,0 +1,52 @@
+import * as mongo from 'mongodb';
+import { default as Notification, INotification } from '../models/notification';
+import publishUserStream from '../event';
+
+/**
+ * Mark as read notification(s)
+ */
+export default (
+	user: string | mongo.ObjectID,
+	message: string | string[] | INotification | INotification[] | mongo.ObjectID | mongo.ObjectID[]
+) => new Promise<any>(async (resolve, reject) => {
+
+	const userId = mongo.ObjectID.prototype.isPrototypeOf(user)
+		? user
+		: new mongo.ObjectID(user);
+
+	const ids: mongo.ObjectID[] = Array.isArray(message)
+		? mongo.ObjectID.prototype.isPrototypeOf(message[0])
+			? (message as mongo.ObjectID[])
+			: typeof message[0] === 'string'
+				? (message as string[]).map(m => new mongo.ObjectID(m))
+				: (message as INotification[]).map(m => m._id)
+		: mongo.ObjectID.prototype.isPrototypeOf(message)
+			? [(message as mongo.ObjectID)]
+			: typeof message === 'string'
+				? [new mongo.ObjectID(message)]
+				: [(message as INotification)._id];
+
+	// Update documents
+	await Notification.update({
+		_id: { $in: ids },
+		is_read: false
+	}, {
+		$set: {
+			is_read: true
+		}
+	}, {
+		multi: true
+	});
+
+	// Calc count of my unread notifications
+	const count = await Notification
+		.count({
+			notifiee_id: userId,
+			is_read: false
+		});
+
+	if (count == 0) {
+		// 全ての(いままで未読だった)通知を(これで)読みましたよというイベントを発行
+		publishUserStream(userId, 'read_all_notifications');
+	}
+});
diff --git a/src/api/endpoints.ts b/src/api/endpoints.ts
index 5bbc480a8e..afefce39e5 100644
--- a/src/api/endpoints.ts
+++ b/src/api/endpoints.ts
@@ -160,6 +160,18 @@ const endpoints: Endpoint[] = [
 		kind: 'account-write'
 	},
 	{
+		name: 'i/change_password',
+		withCredential: true
+	},
+	{
+		name: 'i/regenerate_token',
+		withCredential: true
+	},
+	{
+		name: 'i/pin',
+		kind: 'account-write'
+	},
+	{
 		name: 'i/appdata/get',
 		withCredential: true
 	},
@@ -184,17 +196,17 @@ const endpoints: Endpoint[] = [
 		kind: 'notification-read'
 	},
 	{
-		name: 'notifications/delete',
+		name: 'notifications/get_unread_count',
 		withCredential: true,
-		kind: 'notification-write'
+		kind: 'notification-read'
 	},
 	{
-		name: 'notifications/delete_all',
+		name: 'notifications/delete',
 		withCredential: true,
 		kind: 'notification-write'
 	},
 	{
-		name: 'notifications/mark_as_read',
+		name: 'notifications/delete_all',
 		withCredential: true,
 		kind: 'notification-write'
 	},
@@ -314,6 +326,9 @@ const endpoints: Endpoint[] = [
 		withCredential: true,
 		kind: 'account-read'
 	},
+	{
+		name: 'users/get_frequently_replied_users'
+	},
 
 	{
 		name: 'following/create',
@@ -383,6 +398,10 @@ const endpoints: Endpoint[] = [
 		withCredential: true
 	},
 	{
+		name: 'posts/categorize',
+		withCredential: true
+	},
+	{
 		name: 'posts/reactions',
 		withCredential: true
 	},
@@ -455,8 +474,33 @@ const endpoints: Endpoint[] = [
 		name: 'messaging/messages/create',
 		withCredential: true,
 		kind: 'messaging-write'
-	}
-
+	},
+	{
+		name: 'channels/create',
+		withCredential: true,
+		limit: {
+			duration: ms('1hour'),
+			max: 3,
+			minInterval: ms('10seconds')
+		}
+	},
+	{
+		name: 'channels/show'
+	},
+	{
+		name: 'channels/posts'
+	},
+	{
+		name: 'channels/watch',
+		withCredential: true
+	},
+	{
+		name: 'channels/unwatch',
+		withCredential: true
+	},
+	{
+		name: 'channels'
+	},
 ];
 
 export default endpoints;
diff --git a/src/api/endpoints/aggregation/posts.ts b/src/api/endpoints/aggregation/posts.ts
index 48ee225129..9d8bccbdb2 100644
--- a/src/api/endpoints/aggregation/posts.ts
+++ b/src/api/endpoints/aggregation/posts.ts
@@ -19,7 +19,7 @@ module.exports = params => new Promise(async (res, rej) => {
 		.aggregate([
 			{ $project: {
 				repost_id: '$repost_id',
-				reply_to_id: '$reply_to_id',
+				reply_id: '$reply_id',
 				created_at: { $add: ['$created_at', 9 * 60 * 60 * 1000] } // Convert into JST
 			}},
 			{ $project: {
@@ -34,7 +34,7 @@ module.exports = params => new Promise(async (res, rej) => {
 						then: 'repost',
 						else: {
 							$cond: {
-								if: { $ne: ['$reply_to_id', null] },
+								if: { $ne: ['$reply_id', null] },
 								then: 'reply',
 								else: 'post'
 							}
diff --git a/src/api/endpoints/aggregation/posts/reply.ts b/src/api/endpoints/aggregation/posts/reply.ts
index 02a60c8969..b114c34e1e 100644
--- a/src/api/endpoints/aggregation/posts/reply.ts
+++ b/src/api/endpoints/aggregation/posts/reply.ts
@@ -26,7 +26,7 @@ module.exports = (params) => new Promise(async (res, rej) => {
 
 	const datas = await Post
 		.aggregate([
-			{ $match: { reply_to: post._id } },
+			{ $match: { reply: post._id } },
 			{ $project: {
 				created_at: { $add: ['$created_at', 9 * 60 * 60 * 1000] } // Convert into JST
 			}},
diff --git a/src/api/endpoints/aggregation/users/activity.ts b/src/api/endpoints/aggregation/users/activity.ts
index 5a3e78c441..102a71d7cb 100644
--- a/src/api/endpoints/aggregation/users/activity.ts
+++ b/src/api/endpoints/aggregation/users/activity.ts
@@ -40,7 +40,7 @@ module.exports = (params) => new Promise(async (res, rej) => {
 			{ $match: { user_id: user._id } },
 			{ $project: {
 				repost_id: '$repost_id',
-				reply_to_id: '$reply_to_id',
+				reply_id: '$reply_id',
 				created_at: { $add: ['$created_at', 9 * 60 * 60 * 1000] } // Convert into JST
 			}},
 			{ $project: {
@@ -55,7 +55,7 @@ module.exports = (params) => new Promise(async (res, rej) => {
 						then: 'repost',
 						else: {
 							$cond: {
-								if: { $ne: ['$reply_to_id', null] },
+								if: { $ne: ['$reply_id', null] },
 								then: 'reply',
 								else: 'post'
 							}
diff --git a/src/api/endpoints/aggregation/users/post.ts b/src/api/endpoints/aggregation/users/post.ts
index c964815a0c..c6a75eee39 100644
--- a/src/api/endpoints/aggregation/users/post.ts
+++ b/src/api/endpoints/aggregation/users/post.ts
@@ -34,7 +34,7 @@ module.exports = (params) => new Promise(async (res, rej) => {
 			{ $match: { user_id: user._id } },
 			{ $project: {
 				repost_id: '$repost_id',
-				reply_to_id: '$reply_to_id',
+				reply_id: '$reply_id',
 				created_at: { $add: ['$created_at', 9 * 60 * 60 * 1000] } // Convert into JST
 			}},
 			{ $project: {
@@ -49,7 +49,7 @@ module.exports = (params) => new Promise(async (res, rej) => {
 						then: 'repost',
 						else: {
 							$cond: {
-								if: { $ne: ['$reply_to_id', null] },
+								if: { $ne: ['$reply_id', null] },
 								then: 'reply',
 								else: 'post'
 							}
diff --git a/src/api/endpoints/channels.ts b/src/api/endpoints/channels.ts
new file mode 100644
index 0000000000..e10c943896
--- /dev/null
+++ b/src/api/endpoints/channels.ts
@@ -0,0 +1,59 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Channel from '../models/channel';
+import serialize from '../serializers/channel';
+
+/**
+ * Get all channels
+ *
+ * @param {any} params
+ * @param {any} me
+ * @return {Promise<any>}
+ */
+module.exports = (params, me) => new Promise(async (res, rej) => {
+	// Get 'limit' parameter
+	const [limit = 10, limitErr] = $(params.limit).optional.number().range(1, 100).$;
+	if (limitErr) return rej('invalid limit param');
+
+	// Get 'since_id' parameter
+	const [sinceId, sinceIdErr] = $(params.since_id).optional.id().$;
+	if (sinceIdErr) return rej('invalid since_id param');
+
+	// Get 'max_id' parameter
+	const [maxId, maxIdErr] = $(params.max_id).optional.id().$;
+	if (maxIdErr) return rej('invalid max_id param');
+
+	// Check if both of since_id and max_id is specified
+	if (sinceId && maxId) {
+		return rej('cannot set since_id and max_id');
+	}
+
+	// Construct query
+	const sort = {
+		_id: -1
+	};
+	const query = {} as any;
+	if (sinceId) {
+		sort._id = 1;
+		query._id = {
+			$gt: sinceId
+		};
+	} else if (maxId) {
+		query._id = {
+			$lt: maxId
+		};
+	}
+
+	// Issue query
+	const channels = await Channel
+		.find(query, {
+			limit: limit,
+			sort: sort
+		});
+
+	// Serialize
+	res(await Promise.all(channels.map(async channel =>
+		await serialize(channel, me))));
+});
diff --git a/src/api/endpoints/channels/create.ts b/src/api/endpoints/channels/create.ts
new file mode 100644
index 0000000000..a8d7c29dc1
--- /dev/null
+++ b/src/api/endpoints/channels/create.ts
@@ -0,0 +1,39 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Channel from '../../models/channel';
+import Watching from '../../models/channel-watching';
+import serialize from '../../serializers/channel';
+
+/**
+ * Create a channel
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = async (params, user) => new Promise(async (res, rej) => {
+	// Get 'title' parameter
+	const [title, titleErr] = $(params.title).string().range(1, 100).$;
+	if (titleErr) return rej('invalid title param');
+
+	// Create a channel
+	const channel = await Channel.insert({
+		created_at: new Date(),
+		user_id: user._id,
+		title: title,
+		index: 0,
+		watching_count: 1
+	});
+
+	// Response
+	res(await serialize(channel));
+
+	// Create Watching
+	await Watching.insert({
+		created_at: new Date(),
+		user_id: user._id,
+		channel_id: channel._id
+	});
+});
diff --git a/src/api/endpoints/channels/posts.ts b/src/api/endpoints/channels/posts.ts
new file mode 100644
index 0000000000..fa91fb93ee
--- /dev/null
+++ b/src/api/endpoints/channels/posts.ts
@@ -0,0 +1,79 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import { default as Channel, IChannel } from '../../models/channel';
+import { default as Post, IPost } from '../../models/post';
+import serialize from '../../serializers/post';
+
+/**
+ * Show a posts of a channel
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	// Get 'limit' parameter
+	const [limit = 1000, limitErr] = $(params.limit).optional.number().range(1, 1000).$;
+	if (limitErr) return rej('invalid limit param');
+
+	// Get 'since_id' parameter
+	const [sinceId, sinceIdErr] = $(params.since_id).optional.id().$;
+	if (sinceIdErr) return rej('invalid since_id param');
+
+	// Get 'max_id' parameter
+	const [maxId, maxIdErr] = $(params.max_id).optional.id().$;
+	if (maxIdErr) return rej('invalid max_id param');
+
+	// Check if both of since_id and max_id is specified
+	if (sinceId && maxId) {
+		return rej('cannot set since_id and max_id');
+	}
+
+	// Get 'channel_id' parameter
+	const [channelId, channelIdErr] = $(params.channel_id).id().$;
+	if (channelIdErr) return rej('invalid channel_id param');
+
+	// Fetch channel
+	const channel: IChannel = await Channel.findOne({
+		_id: channelId
+	});
+
+	if (channel === null) {
+		return rej('channel not found');
+	}
+
+	//#region Construct query
+	const sort = {
+		_id: -1
+	};
+
+	const query = {
+		channel_id: channel._id
+	} as any;
+
+	if (sinceId) {
+		sort._id = 1;
+		query._id = {
+			$gt: sinceId
+		};
+	} else if (maxId) {
+		query._id = {
+			$lt: maxId
+		};
+	}
+	//#endregion Construct query
+
+	// Issue query
+	const posts = await Post
+		.find(query, {
+			limit: limit,
+			sort: sort
+		});
+
+	// Serialize
+	res(await Promise.all(posts.map(async (post) =>
+		await serialize(post, user)
+	)));
+});
diff --git a/src/api/endpoints/channels/show.ts b/src/api/endpoints/channels/show.ts
new file mode 100644
index 0000000000..8861e54594
--- /dev/null
+++ b/src/api/endpoints/channels/show.ts
@@ -0,0 +1,31 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import { default as Channel, IChannel } from '../../models/channel';
+import serialize from '../../serializers/channel';
+
+/**
+ * Show a channel
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	// Get 'channel_id' parameter
+	const [channelId, channelIdErr] = $(params.channel_id).id().$;
+	if (channelIdErr) return rej('invalid channel_id param');
+
+	// Fetch channel
+	const channel: IChannel = await Channel.findOne({
+		_id: channelId
+	});
+
+	if (channel === null) {
+		return rej('channel not found');
+	}
+
+	// Serialize
+	res(await serialize(channel, user));
+});
diff --git a/src/api/endpoints/channels/unwatch.ts b/src/api/endpoints/channels/unwatch.ts
new file mode 100644
index 0000000000..19d3be118a
--- /dev/null
+++ b/src/api/endpoints/channels/unwatch.ts
@@ -0,0 +1,60 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Channel from '../../models/channel';
+import Watching from '../../models/channel-watching';
+
+/**
+ * Unwatch a channel
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	// Get 'channel_id' parameter
+	const [channelId, channelIdErr] = $(params.channel_id).id().$;
+	if (channelIdErr) return rej('invalid channel_id param');
+
+	//#region Fetch channel
+	const channel = await Channel.findOne({
+		_id: channelId
+	});
+
+	if (channel === null) {
+		return rej('channel not found');
+	}
+	//#endregion
+
+	//#region Check whether not watching
+	const exist = await Watching.findOne({
+		user_id: user._id,
+		channel_id: channel._id,
+		deleted_at: { $exists: false }
+	});
+
+	if (exist === null) {
+		return rej('already not watching');
+	}
+	//#endregion
+
+	// Delete watching
+	await Watching.update({
+		_id: exist._id
+	}, {
+		$set: {
+			deleted_at: new Date()
+		}
+	});
+
+	// Send response
+	res();
+
+	// Decrement watching count
+	Channel.update(channel._id, {
+		$inc: {
+			watching_count: -1
+		}
+	});
+});
diff --git a/src/api/endpoints/channels/watch.ts b/src/api/endpoints/channels/watch.ts
new file mode 100644
index 0000000000..030e0dd411
--- /dev/null
+++ b/src/api/endpoints/channels/watch.ts
@@ -0,0 +1,58 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Channel from '../../models/channel';
+import Watching from '../../models/channel-watching';
+
+/**
+ * Watch a channel
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	// Get 'channel_id' parameter
+	const [channelId, channelIdErr] = $(params.channel_id).id().$;
+	if (channelIdErr) return rej('invalid channel_id param');
+
+	//#region Fetch channel
+	const channel = await Channel.findOne({
+		_id: channelId
+	});
+
+	if (channel === null) {
+		return rej('channel not found');
+	}
+	//#endregion
+
+	//#region Check whether already watching
+	const exist = await Watching.findOne({
+		user_id: user._id,
+		channel_id: channel._id,
+		deleted_at: { $exists: false }
+	});
+
+	if (exist !== null) {
+		return rej('already watching');
+	}
+	//#endregion
+
+	// Create Watching
+	await Watching.insert({
+		created_at: new Date(),
+		user_id: user._id,
+		channel_id: channel._id
+	});
+
+	// Send response
+	res();
+
+	// Increment watching count
+	Channel.update(channel._id, {
+		$inc: {
+			watching_count: 1
+		}
+	});
+});
diff --git a/src/api/endpoints/drive.ts b/src/api/endpoints/drive.ts
index 41ad6301d7..d92473633a 100644
--- a/src/api/endpoints/drive.ts
+++ b/src/api/endpoints/drive.ts
@@ -14,16 +14,16 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 	// Calculate drive usage
 	const usage = ((await DriveFile
 		.aggregate([
-			{ $match: { user_id: user._id } },
+			{ $match: { 'metadata.user_id': user._id } },
 			{
 				$project: {
-					datasize: true
+					length: true
 				}
 			},
 			{
 				$group: {
 					_id: null,
-					usage: { $sum: '$datasize' }
+					usage: { $sum: '$length' }
 				}
 			}
 		]))[0] || {
diff --git a/src/api/endpoints/drive/files.ts b/src/api/endpoints/drive/files.ts
index a68ae34817..53b48a8bec 100644
--- a/src/api/endpoints/drive/files.ts
+++ b/src/api/endpoints/drive/files.ts
@@ -13,35 +13,35 @@ import serialize from '../../serializers/drive-file';
  * @param {any} app
  * @return {Promise<any>}
  */
-module.exports = (params, user, app) => new Promise(async (res, rej) => {
+module.exports = async (params, user, app) => {
 	// Get 'limit' parameter
 	const [limit = 10, limitErr] = $(params.limit).optional.number().range(1, 100).$;
-	if (limitErr) return rej('invalid limit param');
+	if (limitErr) throw 'invalid limit param';
 
 	// Get 'since_id' parameter
 	const [sinceId, sinceIdErr] = $(params.since_id).optional.id().$;
-	if (sinceIdErr) return rej('invalid since_id param');
+	if (sinceIdErr) throw 'invalid since_id param';
 
 	// Get 'max_id' parameter
 	const [maxId, maxIdErr] = $(params.max_id).optional.id().$;
-	if (maxIdErr) return rej('invalid max_id param');
+	if (maxIdErr) throw 'invalid max_id param';
 
 	// Check if both of since_id and max_id is specified
 	if (sinceId && maxId) {
-		return rej('cannot set since_id and max_id');
+		throw 'cannot set since_id and max_id';
 	}
 
 	// Get 'folder_id' parameter
 	const [folderId = null, folderIdErr] = $(params.folder_id).optional.nullable.id().$;
-	if (folderIdErr) return rej('invalid folder_id param');
+	if (folderIdErr) throw 'invalid folder_id param';
 
 	// Construct query
 	const sort = {
 		_id: -1
 	};
 	const query = {
-		user_id: user._id,
-		folder_id: folderId
+		'metadata.user_id': user._id,
+		'metadata.folder_id': folderId
 	} as any;
 	if (sinceId) {
 		sort._id = 1;
@@ -57,14 +57,11 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 	// Issue query
 	const files = await DriveFile
 		.find(query, {
-			fields: {
-				data: false
-			},
 			limit: limit,
 			sort: sort
 		});
 
 	// Serialize
-	res(await Promise.all(files.map(async file =>
-		await serialize(file))));
-});
+	const _files = await Promise.all(files.map(file => serialize(file)));
+	return _files;
+};
diff --git a/src/api/endpoints/drive/files/find.ts b/src/api/endpoints/drive/files/find.ts
index cd0b33f2ca..1c818131d7 100644
--- a/src/api/endpoints/drive/files/find.ts
+++ b/src/api/endpoints/drive/files/find.ts
@@ -24,13 +24,9 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 	// Issue query
 	const files = await DriveFile
 		.find({
-			name: name,
-			user_id: user._id,
-			folder_id: folderId
-		}, {
-			fields: {
-				data: false
-			}
+			'metadata.name': name,
+			'metadata.user_id': user._id,
+			'metadata.folder_id': folderId
 		});
 
 	// Serialize
diff --git a/src/api/endpoints/drive/files/show.ts b/src/api/endpoints/drive/files/show.ts
index 8dbc297e4f..3c7cf774f9 100644
--- a/src/api/endpoints/drive/files/show.ts
+++ b/src/api/endpoints/drive/files/show.ts
@@ -12,28 +12,26 @@ import serialize from '../../../serializers/drive-file';
  * @param {any} user
  * @return {Promise<any>}
  */
-module.exports = (params, user) => new Promise(async (res, rej) => {
+module.exports = async (params, user) => {
 	// Get 'file_id' parameter
 	const [fileId, fileIdErr] = $(params.file_id).id().$;
-	if (fileIdErr) return rej('invalid file_id param');
+	if (fileIdErr) throw 'invalid file_id param';
 
 	// Fetch file
 	const file = await DriveFile
 		.findOne({
 			_id: fileId,
-			user_id: user._id
-		}, {
-			fields: {
-				data: false
-			}
+			'metadata.user_id': user._id
 		});
 
 	if (file === null) {
-		return rej('file-not-found');
+		throw 'file-not-found';
 	}
 
 	// Serialize
-	res(await serialize(file, {
+	const _file = await serialize(file, {
 		detail: true
-	}));
-});
+	});
+
+	return _file;
+};
diff --git a/src/api/endpoints/drive/files/update.ts b/src/api/endpoints/drive/files/update.ts
index 1cfbdd8f0b..d7b858c2ba 100644
--- a/src/api/endpoints/drive/files/update.ts
+++ b/src/api/endpoints/drive/files/update.ts
@@ -24,11 +24,7 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 	const file = await DriveFile
 		.findOne({
 			_id: fileId,
-			user_id: user._id
-		}, {
-			fields: {
-				data: false
-			}
+			'metadata.user_id': user._id
 		});
 
 	if (file === null) {
@@ -38,7 +34,7 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 	// Get 'name' parameter
 	const [name, nameErr] = $(params.name).optional.string().pipe(validateFileName).$;
 	if (nameErr) return rej('invalid name param');
-	if (name) file.name = name;
+	if (name) file.metadata.name = name;
 
 	// Get 'folder_id' parameter
 	const [folderId, folderIdErr] = $(params.folder_id).optional.nullable.id().$;
@@ -46,7 +42,7 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 
 	if (folderId !== undefined) {
 		if (folderId === null) {
-			file.folder_id = null;
+			file.metadata.folder_id = null;
 		} else {
 			// Fetch folder
 			const folder = await DriveFolder
@@ -59,14 +55,14 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 				return rej('folder-not-found');
 			}
 
-			file.folder_id = folder._id;
+			file.metadata.folder_id = folder._id;
 		}
 	}
 
-	DriveFile.update(file._id, {
+	await DriveFile.update(file._id, {
 		$set: {
-			name: file.name,
-			folder_id: file.folder_id
+			'metadata.name': file.metadata.name,
+			'metadata.folder_id': file.metadata.folder_id
 		}
 	});
 
diff --git a/src/api/endpoints/drive/folders/find.ts b/src/api/endpoints/drive/folders/find.ts
index cdf055839a..a5eb8e015d 100644
--- a/src/api/endpoints/drive/folders/find.ts
+++ b/src/api/endpoints/drive/folders/find.ts
@@ -30,6 +30,5 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 		});
 
 	// Serialize
-	res(await Promise.all(folders.map(async folder =>
-		await serialize(folder))));
+	res(await Promise.all(folders.map(folder => serialize(folder))));
 });
diff --git a/src/api/endpoints/drive/folders/update.ts b/src/api/endpoints/drive/folders/update.ts
index eec2757878..4f2e3d2a7a 100644
--- a/src/api/endpoints/drive/folders/update.ts
+++ b/src/api/endpoints/drive/folders/update.ts
@@ -4,7 +4,7 @@
 import $ from 'cafy';
 import DriveFolder from '../../../models/drive-folder';
 import { isValidFolderName } from '../../../models/drive-folder';
-import serialize from '../../../serializers/drive-file';
+import serialize from '../../../serializers/drive-folder';
 import event from '../../../event';
 
 /**
diff --git a/src/api/endpoints/i/appdata/set.ts b/src/api/endpoints/i/appdata/set.ts
index 24f192de6b..9c3dbe185b 100644
--- a/src/api/endpoints/i/appdata/set.ts
+++ b/src/api/endpoints/i/appdata/set.ts
@@ -21,7 +21,7 @@ module.exports = (params, user, app, isSecure) => new Promise(async (res, rej) =
 	const [data, dataError] = $(params.data).optional.object()
 		.pipe(obj => {
 			const hasInvalidData = Object.entries(obj).some(([k, v]) =>
-				$(k).string().match(/^[a-z_]+$/).isNg() && $(v).string().isNg());
+				$(k).string().match(/^[a-z_]+$/).nok() && $(v).string().nok());
 			return !hasInvalidData;
 		}).$;
 	if (dataError) return rej('invalid data param');
diff --git a/src/api/endpoints/i/change_password.ts b/src/api/endpoints/i/change_password.ts
new file mode 100644
index 0000000000..faceded29d
--- /dev/null
+++ b/src/api/endpoints/i/change_password.ts
@@ -0,0 +1,42 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import * as bcrypt from 'bcryptjs';
+import User from '../../models/user';
+
+/**
+ * Change password
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = async (params, user) => new Promise(async (res, rej) => {
+	// Get 'current_password' parameter
+	const [currentPassword, currentPasswordErr] = $(params.current_password).string().$;
+	if (currentPasswordErr) return rej('invalid current_password param');
+
+	// Get 'new_password' parameter
+	const [newPassword, newPasswordErr] = $(params.new_password).string().$;
+	if (newPasswordErr) return rej('invalid new_password param');
+
+	// Compare password
+	const same = bcrypt.compareSync(currentPassword, user.password);
+
+	if (!same) {
+		return rej('incorrect password');
+	}
+
+	// Generate hash of password
+	const salt = bcrypt.genSaltSync(8);
+	const hash = bcrypt.hashSync(newPassword, salt);
+
+	await User.update(user._id, {
+		$set: {
+			password: hash
+		}
+	});
+
+	res();
+});
diff --git a/src/api/endpoints/i/notifications.ts b/src/api/endpoints/i/notifications.ts
index 5575fb7412..607e0768a4 100644
--- a/src/api/endpoints/i/notifications.ts
+++ b/src/api/endpoints/i/notifications.ts
@@ -5,6 +5,7 @@ import $ from 'cafy';
 import Notification from '../../models/notification';
 import serialize from '../../serializers/notification';
 import getFriends from '../../common/get-friends';
+import read from '../../common/read-notification';
 
 /**
  * Get notifications
@@ -91,17 +92,6 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 
 	// Mark as read all
 	if (notifications.length > 0 && markAsRead) {
-		const ids = notifications
-			.filter(x => x.is_read == false)
-			.map(x => x._id);
-
-		// Update documents
-		await Notification.update({
-			_id: { $in: ids }
-		}, {
-			$set: { is_read: true }
-		}, {
-			multi: true
-		});
+		read(user._id, notifications);
 	}
 });
diff --git a/src/api/endpoints/i/pin.ts b/src/api/endpoints/i/pin.ts
new file mode 100644
index 0000000000..a94950d22b
--- /dev/null
+++ b/src/api/endpoints/i/pin.ts
@@ -0,0 +1,44 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import User from '../../models/user';
+import Post from '../../models/post';
+import serialize from '../../serializers/user';
+
+/**
+ * Pin post
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = async (params, user) => new Promise(async (res, rej) => {
+	// Get 'post_id' parameter
+	const [postId, postIdErr] = $(params.post_id).id().$;
+	if (postIdErr) return rej('invalid post_id param');
+
+	// Fetch pinee
+	const post = await Post.findOne({
+		_id: postId,
+		user_id: user._id
+	});
+
+	if (post === null) {
+		return rej('post not found');
+	}
+
+	await User.update(user._id, {
+		$set: {
+			pinned_post_id: post._id
+		}
+	});
+
+	// Serialize
+	const iObj = await serialize(user, user, {
+		detail: true
+	});
+
+	// Send response
+	res(iObj);
+});
diff --git a/src/api/endpoints/i/regenerate_token.ts b/src/api/endpoints/i/regenerate_token.ts
new file mode 100644
index 0000000000..f96d10ebfc
--- /dev/null
+++ b/src/api/endpoints/i/regenerate_token.ts
@@ -0,0 +1,42 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import * as bcrypt from 'bcryptjs';
+import User from '../../models/user';
+import event from '../../event';
+import generateUserToken from '../../common/generate-native-user-token';
+
+/**
+ * Regenerate native token
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = async (params, user) => new Promise(async (res, rej) => {
+	// Get 'password' parameter
+	const [password, passwordErr] = $(params.password).string().$;
+	if (passwordErr) return rej('invalid password param');
+
+	// Compare password
+	const same = bcrypt.compareSync(password, user.password);
+
+	if (!same) {
+		return rej('incorrect password');
+	}
+
+	// Generate secret
+	const secret = generateUserToken();
+
+	await User.update(user._id, {
+		$set: {
+			token: secret
+		}
+	});
+
+	res();
+
+	// Publish event
+	event(user._id, 'my_token_regenerated');
+});
diff --git a/src/api/endpoints/messaging/messages/create.ts b/src/api/endpoints/messaging/messages/create.ts
index 8af55d850c..149852c093 100644
--- a/src/api/endpoints/messaging/messages/create.ts
+++ b/src/api/endpoints/messaging/messages/create.ts
@@ -54,9 +54,7 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 	if (fileId !== undefined) {
 		file = await DriveFile.findOne({
 			_id: fileId,
-			user_id: user._id
-		}, {
-			data: false
+			'metadata.user_id': user._id
 		});
 
 		if (file === null) {
diff --git a/src/api/endpoints/notifications/get_unread_count.ts b/src/api/endpoints/notifications/get_unread_count.ts
new file mode 100644
index 0000000000..9514e78713
--- /dev/null
+++ b/src/api/endpoints/notifications/get_unread_count.ts
@@ -0,0 +1,23 @@
+/**
+ * Module dependencies
+ */
+import Notification from '../../models/notification';
+
+/**
+ * Get count of unread notifications
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	const count = await Notification
+		.count({
+			notifiee_id: user._id,
+			is_read: false
+		});
+
+	res({
+		count: count
+	});
+});
diff --git a/src/api/endpoints/notifications/mark_as_read.ts b/src/api/endpoints/notifications/mark_as_read.ts
deleted file mode 100644
index 5cce33e850..0000000000
--- a/src/api/endpoints/notifications/mark_as_read.ts
+++ /dev/null
@@ -1,47 +0,0 @@
-/**
- * Module dependencies
- */
-import $ from 'cafy';
-import Notification from '../../models/notification';
-import serialize from '../../serializers/notification';
-import event from '../../event';
-
-/**
- * Mark as read a notification
- *
- * @param {any} params
- * @param {any} user
- * @return {Promise<any>}
- */
-module.exports = (params, user) => new Promise(async (res, rej) => {
-	const [notificationId, notificationIdErr] = $(params.notification_id).id().$;
-	if (notificationIdErr) return rej('invalid notification_id param');
-
-	// Get notification
-	const notification = await Notification
-		.findOne({
-			_id: notificationId,
-			i: user._id
-		});
-
-	if (notification === null) {
-		return rej('notification-not-found');
-	}
-
-	// Update
-	notification.is_read = true;
-	Notification.update({ _id: notification._id }, {
-		$set: {
-			is_read: true
-		}
-	});
-
-	// Response
-	res();
-
-	// Serialize
-	const notificationObj = await serialize(notification);
-
-	// Publish read_notification event
-	event(user._id, 'read_notification', notificationObj);
-});
diff --git a/src/api/endpoints/notifications/mark_as_read_all.ts b/src/api/endpoints/notifications/mark_as_read_all.ts
new file mode 100644
index 0000000000..3550e344c4
--- /dev/null
+++ b/src/api/endpoints/notifications/mark_as_read_all.ts
@@ -0,0 +1,32 @@
+/**
+ * Module dependencies
+ */
+import Notification from '../../models/notification';
+import event from '../../event';
+
+/**
+ * Mark as read all notifications
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	// Update documents
+	await Notification.update({
+		notifiee_id: user._id,
+		is_read: false
+	}, {
+		$set: {
+			is_read: true
+		}
+	}, {
+		multi: true
+	});
+
+	// Response
+	res();
+
+	// 全ての通知を読みましたよというイベントを発行
+	event(user._id, 'read_all_notifications');
+});
diff --git a/src/api/endpoints/posts.ts b/src/api/endpoints/posts.ts
index 23b9bd0b66..f6efcc108d 100644
--- a/src/api/endpoints/posts.ts
+++ b/src/api/endpoints/posts.ts
@@ -62,7 +62,7 @@ module.exports = (params) => new Promise(async (res, rej) => {
 	}
 
 	if (reply != undefined) {
-		query.reply_to_id = reply ? { $exists: true, $ne: null } : null;
+		query.reply_id = reply ? { $exists: true, $ne: null } : null;
 	}
 
 	if (repost != undefined) {
diff --git a/src/api/endpoints/posts/categorize.ts b/src/api/endpoints/posts/categorize.ts
new file mode 100644
index 0000000000..3530ba6bc4
--- /dev/null
+++ b/src/api/endpoints/posts/categorize.ts
@@ -0,0 +1,52 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Post from '../../models/post';
+
+/**
+ * Categorize a post
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	if (!user.is_pro) {
+		return rej('This endpoint is available only from a Pro account');
+	}
+
+	// Get 'post_id' parameter
+	const [postId, postIdErr] = $(params.post_id).id().$;
+	if (postIdErr) return rej('invalid post_id param');
+
+	// Get categorizee
+	const post = await Post.findOne({
+		_id: postId
+	});
+
+	if (post === null) {
+		return rej('post not found');
+	}
+
+	if (post.is_category_verified) {
+		return rej('This post already has the verified category');
+	}
+
+	// Get 'category' parameter
+	const [category, categoryErr] = $(params.category).string().or([
+		'music', 'game', 'anime', 'it', 'gadgets', 'photography'
+	]).$;
+	if (categoryErr) return rej('invalid category param');
+
+	// Set category
+	Post.update({ _id: post._id }, {
+		$set: {
+			category: category,
+			is_category_verified: true
+		}
+	});
+
+	// Send response
+	res();
+});
diff --git a/src/api/endpoints/posts/context.ts b/src/api/endpoints/posts/context.ts
index cd5f15f481..bad59a6bee 100644
--- a/src/api/endpoints/posts/context.ts
+++ b/src/api/endpoints/posts/context.ts
@@ -49,13 +49,13 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 			return;
 		}
 
-		if (p.reply_to_id) {
-			await get(p.reply_to_id);
+		if (p.reply_id) {
+			await get(p.reply_id);
 		}
 	}
 
-	if (post.reply_to_id) {
-		await get(post.reply_to_id);
+	if (post.reply_id) {
+		await get(post.reply_id);
 	}
 
 	// Serialize
diff --git a/src/api/endpoints/posts/create.ts b/src/api/endpoints/posts/create.ts
index eb979402c4..4f4b7e2e83 100644
--- a/src/api/endpoints/posts/create.ts
+++ b/src/api/endpoints/posts/create.ts
@@ -4,16 +4,17 @@
 import $ from 'cafy';
 import deepEqual = require('deep-equal');
 import parse from '../../common/text';
-import Post from '../../models/post';
-import { isValidText } from '../../models/post';
-import User from '../../models/user';
+import { default as Post, IPost, isValidText } from '../../models/post';
+import { default as User, IUser } from '../../models/user';
+import { default as Channel, IChannel } from '../../models/channel';
 import Following from '../../models/following';
 import DriveFile from '../../models/drive-file';
 import Watching from '../../models/post-watching';
+import ChannelWatching from '../../models/channel-watching';
 import serialize from '../../serializers/post';
 import notify from '../../common/notify';
 import watch from '../../common/watch-post';
-import event from '../../event';
+import { default as event, publishChannelStream } from '../../event';
 import config from '../../../conf';
 
 /**
@@ -24,7 +25,7 @@ import config from '../../../conf';
  * @param {any} app
  * @return {Promise<any>}
  */
-module.exports = (params, user, app) => new Promise(async (res, rej) => {
+module.exports = (params, user: IUser, app) => new Promise(async (res, rej) => {
 	// Get 'text' parameter
 	const [text, textErr] = $(params.text).optional.string().pipe(isValidText).$;
 	if (textErr) return rej('invalid text');
@@ -43,9 +44,7 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 			// SELECT _id
 			const entity = await DriveFile.findOne({
 				_id: mediaId,
-				user_id: user._id
-			}, {
-				_id: true
+				'metadata.user_id': user._id
 			});
 
 			if (entity === null) {
@@ -62,7 +61,8 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 	const [repostId, repostIdErr] = $(params.repost_id).optional.id().$;
 	if (repostIdErr) return rej('invalid repost_id');
 
-	let repost = null;
+	let repost: IPost = null;
+	let isQuote = false;
 	if (repostId !== undefined) {
 		// Fetch repost to post
 		repost = await Post.findOne({
@@ -84,43 +84,86 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 			}
 		});
 
+		isQuote = text != null || files != null;
+
 		// 直近と同じRepost対象かつ引用じゃなかったらエラー
 		if (latestPost &&
 			latestPost.repost_id &&
 			latestPost.repost_id.equals(repost._id) &&
-			text === undefined && files === null) {
+			!isQuote) {
 			return rej('cannot repost same post that already reposted in your latest post');
 		}
 
 		// 直近がRepost対象かつ引用じゃなかったらエラー
 		if (latestPost &&
 			latestPost._id.equals(repost._id) &&
-			text === undefined && files === null) {
+			!isQuote) {
 			return rej('cannot repost your latest post');
 		}
 	}
 
-	// Get 'in_reply_to_post_id' parameter
-	const [inReplyToPostId, inReplyToPostIdErr] = $(params.reply_to_id).optional.id().$;
-	if (inReplyToPostIdErr) return rej('invalid in_reply_to_post_id');
+	// Get 'reply_id' parameter
+	const [replyId, replyIdErr] = $(params.reply_id).optional.id().$;
+	if (replyIdErr) return rej('invalid reply_id');
 
-	let inReplyToPost = null;
-	if (inReplyToPostId !== undefined) {
+	let reply: IPost = null;
+	if (replyId !== undefined) {
 		// Fetch reply
-		inReplyToPost = await Post.findOne({
-			_id: inReplyToPostId
+		reply = await Post.findOne({
+			_id: replyId
 		});
 
-		if (inReplyToPost === null) {
+		if (reply === null) {
 			return rej('in reply to post is not found');
 		}
 
 		// 返信対象が引用でないRepostだったらエラー
-		if (inReplyToPost.repost_id && !inReplyToPost.text && !inReplyToPost.media_ids) {
+		if (reply.repost_id && !reply.text && !reply.media_ids) {
 			return rej('cannot reply to repost');
 		}
 	}
 
+	// Get 'channel_id' parameter
+	const [channelId, channelIdErr] = $(params.channel_id).optional.id().$;
+	if (channelIdErr) return rej('invalid channel_id');
+
+	let channel: IChannel = null;
+	if (channelId !== undefined) {
+		// Fetch channel
+		channel = await Channel.findOne({
+			_id: channelId
+		});
+
+		if (channel === null) {
+			return rej('channel not found');
+		}
+
+		// 返信対象の投稿がこのチャンネルじゃなかったらダメ
+		if (reply && !channelId.equals(reply.channel_id)) {
+			return rej('チャンネル内部からチャンネル外部の投稿に返信することはできません');
+		}
+
+		// Repost対象の投稿がこのチャンネルじゃなかったらダメ
+		if (repost && !channelId.equals(repost.channel_id)) {
+			return rej('チャンネル内部からチャンネル外部の投稿をRepostすることはできません');
+		}
+
+		// 引用ではないRepostはダメ
+		if (repost && !isQuote) {
+			return rej('チャンネル内部では引用ではないRepostをすることはできません');
+		}
+	} else {
+		// 返信対象の投稿がチャンネルへの投稿だったらダメ
+		if (reply && reply.channel_id != null) {
+			return rej('チャンネル外部からチャンネル内部の投稿に返信することはできません');
+		}
+
+		// Repost対象の投稿がチャンネルへの投稿だったらダメ
+		if (repost && repost.channel_id != null) {
+			return rej('チャンネル外部からチャンネル内部の投稿をRepostすることはできません');
+		}
+	}
+
 	// Get 'poll' parameter
 	const [poll, pollErr] = $(params.poll).optional.strict.object()
 		.have('choices', $().array('string')
@@ -148,15 +191,15 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 	if (user.latest_post) {
 		if (deepEqual({
 			text: user.latest_post.text,
-			reply: user.latest_post.reply_to_id ? user.latest_post.reply_to_id.toString() : null,
+			reply: user.latest_post.reply_id ? user.latest_post.reply_id.toString() : null,
 			repost: user.latest_post.repost_id ? user.latest_post.repost_id.toString() : null,
 			media_ids: (user.latest_post.media_ids || []).map(id => id.toString())
 		}, {
-				text: text,
-				reply: inReplyToPost ? inReplyToPost._id.toString() : null,
-				repost: repost ? repost._id.toString() : null,
-				media_ids: (files || []).map(file => file._id.toString())
-			})) {
+			text: text,
+			reply: reply ? reply._id.toString() : null,
+			repost: repost ? repost._id.toString() : null,
+			media_ids: (files || []).map(file => file._id.toString())
+		})) {
 			return rej('duplicate');
 		}
 	}
@@ -164,8 +207,10 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 	// 投稿を作成
 	const post = await Post.insert({
 		created_at: new Date(),
+		channel_id: channel ? channel._id : undefined,
+		index: channel ? channel.index + 1 : undefined,
 		media_ids: files ? files.map(file => file._id) : undefined,
-		reply_to_id: inReplyToPost ? inReplyToPost._id : undefined,
+		reply_id: reply ? reply._id : undefined,
 		repost_id: repost ? repost._id : undefined,
 		poll: poll,
 		text: text,
@@ -179,8 +224,7 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 	// Reponse
 	res(postObj);
 
-	// -----------------------------------------------------------
-	// Post processes
+	//#region Post processes
 
 	User.update({ _id: user._id }, {
 		$set: {
@@ -203,23 +247,51 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 		}
 	}
 
-	// Publish event to myself's stream
-	event(user._id, 'post', postObj);
+	// タイムラインへの投稿
+	if (!channel) {
+		// Publish event to myself's stream
+		event(user._id, 'post', postObj);
 
-	// Fetch all followers
-	const followers = await Following
-		.find({
-			followee_id: user._id,
+		// Fetch all followers
+		const followers = await Following
+			.find({
+				followee_id: user._id,
+				// 削除されたドキュメントは除く
+				deleted_at: { $exists: false }
+			}, {
+				follower_id: true,
+				_id: false
+			});
+
+		// Publish event to followers stream
+		followers.forEach(following =>
+			event(following.follower_id, 'post', postObj));
+	}
+
+	// チャンネルへの投稿
+	if (channel) {
+		// Increment channel index(posts count)
+		Channel.update({ _id: channel._id }, {
+			$inc: {
+				index: 1
+			}
+		});
+
+		// Publish event to channel
+		publishChannelStream(channel._id, 'post', postObj);
+
+		// Get channel watchers
+		const watches = await ChannelWatching.find({
+			channel_id: channel._id,
 			// 削除されたドキュメントは除く
 			deleted_at: { $exists: false }
-		}, {
-			follower_id: true,
-			_id: false
 		});
 
-	// Publish event to followers stream
-	followers.forEach(following =>
-		event(following.follower_id, 'post', postObj));
+		// チャンネルの視聴者(のタイムライン)に配信
+		watches.forEach(w => {
+			event(w.user_id, 'post', postObj);
+		});
+	}
 
 	// Increment my posts count
 	User.update({ _id: user._id }, {
@@ -229,23 +301,23 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 	});
 
 	// If has in reply to post
-	if (inReplyToPost) {
+	if (reply) {
 		// Increment replies count
-		Post.update({ _id: inReplyToPost._id }, {
+		Post.update({ _id: reply._id }, {
 			$inc: {
 				replies_count: 1
 			}
 		});
 
 		// 自分自身へのリプライでない限りは通知を作成
-		notify(inReplyToPost.user_id, user._id, 'reply', {
+		notify(reply.user_id, user._id, 'reply', {
 			post_id: post._id
 		});
 
 		// Fetch watchers
 		Watching
 			.find({
-				post_id: inReplyToPost._id,
+				post_id: reply._id,
 				user_id: { $ne: user._id },
 				// 削除されたドキュメントは除く
 				deleted_at: { $exists: false }
@@ -265,10 +337,10 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 		// この投稿をWatchする
 		// TODO: ユーザーが「返信したときに自動でWatchする」設定を
 		//       オフにしていた場合はしない
-		watch(user._id, inReplyToPost);
+		watch(user._id, reply);
 
 		// Add mention
-		addMention(inReplyToPost.user_id, 'reply');
+		addMention(reply.user_id, 'reply');
 	}
 
 	// If it is repost
@@ -369,7 +441,7 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 			if (mentionee == null) return;
 
 			// 既に言及されたユーザーに対する返信や引用repostの場合も無視
-			if (inReplyToPost && inReplyToPost.user_id.equals(mentionee._id)) return;
+			if (reply && reply.user_id.equals(mentionee._id)) return;
 			if (repost && repost.user_id.equals(mentionee._id)) return;
 
 			// Add mention
@@ -406,4 +478,6 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 			}
 		});
 	}
+
+	//#endregion
 });
diff --git a/src/api/endpoints/posts/replies.ts b/src/api/endpoints/posts/replies.ts
index 89f4d99841..3fd6a46769 100644
--- a/src/api/endpoints/posts/replies.ts
+++ b/src/api/endpoints/posts/replies.ts
@@ -40,7 +40,7 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 
 	// Issue query
 	const replies = await Post
-		.find({ reply_to_id: post._id }, {
+		.find({ reply_id: post._id }, {
 			limit: limit,
 			skip: offset,
 			sort: {
diff --git a/src/api/endpoints/posts/timeline.ts b/src/api/endpoints/posts/timeline.ts
index 314e992344..203413e23a 100644
--- a/src/api/endpoints/posts/timeline.ts
+++ b/src/api/endpoints/posts/timeline.ts
@@ -2,7 +2,9 @@
  * Module dependencies
  */
 import $ from 'cafy';
+import rap from '@prezzemolo/rap';
 import Post from '../../models/post';
+import ChannelWatching from '../../models/channel-watching';
 import getFriends from '../../common/get-friends';
 import serialize from '../../serializers/post';
 
@@ -14,36 +16,62 @@ import serialize from '../../serializers/post';
  * @param {any} app
  * @return {Promise<any>}
  */
-module.exports = (params, user, app) => new Promise(async (res, rej) => {
+module.exports = async (params, user, app) => {
 	// Get 'limit' parameter
 	const [limit = 10, limitErr] = $(params.limit).optional.number().range(1, 100).$;
-	if (limitErr) return rej('invalid limit param');
+	if (limitErr) throw 'invalid limit param';
 
 	// Get 'since_id' parameter
 	const [sinceId, sinceIdErr] = $(params.since_id).optional.id().$;
-	if (sinceIdErr) return rej('invalid since_id param');
+	if (sinceIdErr) throw 'invalid since_id param';
 
 	// Get 'max_id' parameter
 	const [maxId, maxIdErr] = $(params.max_id).optional.id().$;
-	if (maxIdErr) return rej('invalid max_id param');
+	if (maxIdErr) throw 'invalid max_id param';
 
 	// Check if both of since_id and max_id is specified
 	if (sinceId && maxId) {
-		return rej('cannot set since_id and max_id');
+		throw 'cannot set since_id and max_id';
 	}
 
-	// ID list of the user $self and other users who the user follows
-	const followingIds = await getFriends(user._id);
+	const { followingIds, watchChannelIds } = await rap({
+		// ID list of the user itself and other users who the user follows
+		followingIds: getFriends(user._id),
+		// Watchしているチャンネルを取得
+		watchChannelIds: ChannelWatching.find({
+			user_id: user._id,
+			// 削除されたドキュメントは除く
+			deleted_at: { $exists: false }
+		}).then(watches => watches.map(w => w.channel_id))
+	});
 
-	// Construct query
+	//#region Construct query
 	const sort = {
 		_id: -1
 	};
+
 	const query = {
-		user_id: {
-			$in: followingIds
-		}
+		$or: [{
+			// フォローしている人のタイムラインへの投稿
+			user_id: {
+				$in: followingIds
+			},
+			// 「タイムラインへの」投稿に限定するためにチャンネルが指定されていないもののみに限る
+			$or: [{
+				channel_id: {
+					$exists: false
+				}
+			}, {
+				channel_id: null
+			}]
+		}, {
+			// Watchしているチャンネルへの投稿
+			channel_id: {
+				$in: watchChannelIds
+			}
+		}]
 	} as any;
+
 	if (sinceId) {
 		sort._id = 1;
 		query._id = {
@@ -54,6 +82,7 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 			$lt: maxId
 		};
 	}
+	//#endregion
 
 	// Issue query
 	const timeline = await Post
@@ -63,7 +92,6 @@ module.exports = (params, user, app) => new Promise(async (res, rej) => {
 		});
 
 	// Serialize
-	res(await Promise.all(timeline.map(async post =>
-		await serialize(post, user)
-	)));
-});
+	const _timeline = await Promise.all(timeline.map(post => serialize(post, user)));
+	return _timeline;
+};
diff --git a/src/api/endpoints/posts/trend.ts b/src/api/endpoints/posts/trend.ts
index 3277206d26..64a195dff1 100644
--- a/src/api/endpoints/posts/trend.ts
+++ b/src/api/endpoints/posts/trend.ts
@@ -48,7 +48,7 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 	} as any;
 
 	if (reply != undefined) {
-		query.reply_to_id = reply ? { $exists: true, $ne: null } : null;
+		query.reply_id = reply ? { $exists: true, $ne: null } : null;
 	}
 
 	if (repost != undefined) {
diff --git a/src/api/endpoints/users/get_frequently_replied_users.ts b/src/api/endpoints/users/get_frequently_replied_users.ts
new file mode 100644
index 0000000000..bb0f3b4cea
--- /dev/null
+++ b/src/api/endpoints/users/get_frequently_replied_users.ts
@@ -0,0 +1,96 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Post from '../../models/post';
+import User from '../../models/user';
+import serialize from '../../serializers/user';
+
+module.exports = (params, me) => new Promise(async (res, rej) => {
+	// Get 'user_id' parameter
+	const [userId, userIdErr] = $(params.user_id).id().$;
+	if (userIdErr) return rej('invalid user_id param');
+
+	// Lookup user
+	const user = await User.findOne({
+		_id: userId
+	}, {
+		fields: {
+			_id: true
+		}
+	});
+
+	if (user === null) {
+		return rej('user not found');
+	}
+
+	// Fetch recent posts
+	const recentPosts = await Post.find({
+		user_id: user._id,
+		reply_id: {
+			$exists: true,
+			$ne: null
+		}
+	}, {
+		sort: {
+			_id: -1
+		},
+		limit: 1000,
+		fields: {
+			_id: false,
+			reply_id: true
+		}
+	});
+
+	// 投稿が少なかったら中断
+	if (recentPosts.length === 0) {
+		return res([]);
+	}
+
+	const replyTargetPosts = await Post.find({
+		_id: {
+			$in: recentPosts.map(p => p.reply_id)
+		},
+		user_id: {
+			$ne: user._id
+		}
+	}, {
+		fields: {
+			_id: false,
+			user_id: true
+		}
+	});
+
+	const repliedUsers = {};
+
+	// Extract replies from recent posts
+	replyTargetPosts.forEach(post => {
+		const userId = post.user_id.toString();
+		if (repliedUsers[userId]) {
+			repliedUsers[userId]++;
+		} else {
+			repliedUsers[userId] = 1;
+		}
+	});
+
+	// Calc peak
+	let peak = 0;
+	Object.keys(repliedUsers).forEach(user => {
+		if (repliedUsers[user] > peak) peak = repliedUsers[user];
+	});
+
+	// Sort replies by frequency
+	const repliedUsersSorted = Object.keys(repliedUsers).sort((a, b) => repliedUsers[b] - repliedUsers[a]);
+
+	// Lookup top 10 replies
+	const topRepliedUsers = repliedUsersSorted.slice(0, 10);
+
+	// Make replies object (includes weights)
+	const repliesObj = await Promise.all(topRepliedUsers.map(async (user) => ({
+		user: await serialize(user, me, { detail: true }),
+		weight: repliedUsers[user] / peak
+	})));
+
+	// Response
+	res(repliesObj);
+});
diff --git a/src/api/endpoints/users/posts.ts b/src/api/endpoints/users/posts.ts
index e37b660773..d8204b8b80 100644
--- a/src/api/endpoints/users/posts.ts
+++ b/src/api/endpoints/users/posts.ts
@@ -85,7 +85,7 @@ module.exports = (params, me) => new Promise(async (res, rej) => {
 	}
 
 	if (!includeReplies) {
-		query.reply_to_id = null;
+		query.reply_id = null;
 	}
 
 	if (withMedia) {
diff --git a/src/api/event.ts b/src/api/event.ts
index 9613a9f7cc..909b0d2556 100644
--- a/src/api/event.ts
+++ b/src/api/event.ts
@@ -25,6 +25,10 @@ class MisskeyEvent {
 		this.publish(`messaging-stream:${userId}-${otherpartyId}`, type, typeof value === 'undefined' ? null : value);
 	}
 
+	public publishChannelStream(channelId: ID, type: string, value?: any): void {
+		this.publish(`channel-stream:${channelId}`, type, typeof value === 'undefined' ? null : value);
+	}
+
 	private publish(channel: string, type: string, value?: any): void {
 		const message = value == null ?
 			{ type: type } :
@@ -41,3 +45,5 @@ export default ev.publishUserStream.bind(ev);
 export const publishPostStream = ev.publishPostStream.bind(ev);
 
 export const publishMessagingStream = ev.publishMessagingStream.bind(ev);
+
+export const publishChannelStream = ev.publishChannelStream.bind(ev);
diff --git a/src/api/models/access-token.ts b/src/api/models/access-token.ts
index 2a8a512ddc..9985be5013 100644
--- a/src/api/models/access-token.ts
+++ b/src/api/models/access-token.ts
@@ -2,7 +2,7 @@ import db from '../../db/mongodb';
 
 const collection = db.get('access_tokens');
 
-(collection as any).index('token'); // fuck type definition
-(collection as any).index('hash'); // fuck type definition
+(collection as any).createIndex('token'); // fuck type definition
+(collection as any).createIndex('hash'); // fuck type definition
 
 export default collection as any; // fuck type definition
diff --git a/src/api/models/app.ts b/src/api/models/app.ts
index bf5dc80c2c..68f2f448b0 100644
--- a/src/api/models/app.ts
+++ b/src/api/models/app.ts
@@ -2,9 +2,9 @@ import db from '../../db/mongodb';
 
 const collection = db.get('apps');
 
-(collection as any).index('name_id'); // fuck type definition
-(collection as any).index('name_id_lower'); // fuck type definition
-(collection as any).index('secret'); // fuck type definition
+(collection as any).createIndex('name_id'); // fuck type definition
+(collection as any).createIndex('name_id_lower'); // fuck type definition
+(collection as any).createIndex('secret'); // fuck type definition
 
 export default collection as any; // fuck type definition
 
diff --git a/src/api/models/channel-watching.ts b/src/api/models/channel-watching.ts
new file mode 100644
index 0000000000..6184ae408d
--- /dev/null
+++ b/src/api/models/channel-watching.ts
@@ -0,0 +1,3 @@
+import db from '../../db/mongodb';
+
+export default db.get('channel_watching') as any; // fuck type definition
diff --git a/src/api/models/channel.ts b/src/api/models/channel.ts
new file mode 100644
index 0000000000..c80e84dbc8
--- /dev/null
+++ b/src/api/models/channel.ts
@@ -0,0 +1,14 @@
+import * as mongo from 'mongodb';
+import db from '../../db/mongodb';
+
+const collection = db.get('channels');
+
+export default collection as any; // fuck type definition
+
+export type IChannel = {
+	_id: mongo.ObjectID;
+	created_at: Date;
+	title: string;
+	user_id: mongo.ObjectID;
+	index: number;
+};
diff --git a/src/api/models/drive-file.ts b/src/api/models/drive-file.ts
index 4c7204b1f4..8968d065cd 100644
--- a/src/api/models/drive-file.ts
+++ b/src/api/models/drive-file.ts
@@ -1,11 +1,22 @@
-import db from '../../db/mongodb';
+import * as mongodb from 'mongodb';
+import monkDb, { nativeDbConn } from '../../db/mongodb';
 
-const collection = db.get('drive_files');
+const collection = monkDb.get('drive_files.files');
 
-(collection as any).index('hash'); // fuck type definition
+(collection as any).createIndex('hash'); // fuck type definition
 
 export default collection as any; // fuck type definition
 
+const getGridFSBucket = async (): Promise<mongodb.GridFSBucket> => {
+	const db = await nativeDbConn();
+	const bucket = new mongodb.GridFSBucket(db, {
+		bucketName: 'drive_files'
+	});
+	return bucket;
+};
+
+export { getGridFSBucket };
+
 export function validateFileName(name: string): boolean {
 	return (
 		(name.trim().length > 0) &&
diff --git a/src/api/models/notification.ts b/src/api/models/notification.ts
index 1c1f429a0d..1065e8baaa 100644
--- a/src/api/models/notification.ts
+++ b/src/api/models/notification.ts
@@ -1,3 +1,8 @@
+import * as mongo from 'mongodb';
 import db from '../../db/mongodb';
 
 export default db.get('notifications') as any; // fuck type definition
+
+export interface INotification {
+	_id: mongo.ObjectID;
+}
diff --git a/src/api/models/post.ts b/src/api/models/post.ts
index baab63f991..7584ce182d 100644
--- a/src/api/models/post.ts
+++ b/src/api/models/post.ts
@@ -1,3 +1,5 @@
+import * as mongo from 'mongodb';
+
 import db from '../../db/mongodb';
 
 export default db.get('posts') as any; // fuck type definition
@@ -5,3 +7,16 @@ export default db.get('posts') as any; // fuck type definition
 export function isValidText(text: string): boolean {
 	return text.length <= 1000 && text.trim() != '';
 }
+
+export type IPost = {
+	_id: mongo.ObjectID;
+	channel_id: mongo.ObjectID;
+	created_at: Date;
+	media_ids: mongo.ObjectID[];
+	reply_id: mongo.ObjectID;
+	repost_id: mongo.ObjectID;
+	poll: {}; // todo
+	text: string;
+	user_id: mongo.ObjectID;
+	app_id: mongo.ObjectID;
+};
diff --git a/src/api/models/user.ts b/src/api/models/user.ts
index cd16459891..b2f3af09fa 100644
--- a/src/api/models/user.ts
+++ b/src/api/models/user.ts
@@ -1,9 +1,12 @@
+import * as mongo from 'mongodb';
+
 import db from '../../db/mongodb';
+import { IPost } from './post';
 
 const collection = db.get('users');
 
-(collection as any).index('username'); // fuck type definition
-(collection as any).index('token'); // fuck type definition
+(collection as any).createIndex('username'); // fuck type definition
+(collection as any).createIndex('token'); // fuck type definition
 
 export default collection as any; // fuck type definition
 
@@ -31,6 +34,50 @@ export function isValidBirthday(birthday: string): boolean {
 	return typeof birthday == 'string' && /^([0-9]{4})\-([0-9]{2})-([0-9]{2})$/.test(birthday);
 }
 
-export interface IUser {
+export type IUser = {
+	_id: mongo.ObjectID;
+	created_at: Date;
+	email: string;
+	followers_count: number;
+	following_count: number;
+	links: string[];
 	name: string;
+	password: string;
+	posts_count: number;
+	drive_capacity: number;
+	username: string;
+	username_lower: string;
+	token: string;
+	avatar_id: mongo.ObjectID;
+	banner_id: mongo.ObjectID;
+	data: any;
+	twitter: {
+		access_token: string;
+		access_token_secret: string;
+		user_id: string;
+		screen_name: string;
+	};
+	line: {
+		user_id: string;
+	};
+	description: string;
+	profile: {
+		location: string;
+		birthday: string; // 'YYYY-MM-DD'
+		tags: string[];
+	};
+	last_used_at: Date;
+	latest_post: IPost;
+	pinned_post_id: mongo.ObjectID;
+	is_pro: boolean;
+	is_suspended: boolean;
+	keywords: string[];
+};
+
+export function init(user): IUser {
+	user._id = new mongo.ObjectID(user._id);
+	user.avatar_id = new mongo.ObjectID(user.avatar_id);
+	user.banner_id = new mongo.ObjectID(user.banner_id);
+	user.pinned_post_id = new mongo.ObjectID(user.pinned_post_id);
+	return user;
 }
diff --git a/src/api/private/signin.ts b/src/api/private/signin.ts
index afa83e50c3..c7dc243980 100644
--- a/src/api/private/signin.ts
+++ b/src/api/private/signin.ts
@@ -1,6 +1,6 @@
 import * as express from 'express';
 import * as bcrypt from 'bcryptjs';
-import User from '../models/user';
+import { default as User, IUser } from '../models/user';
 import Signin from '../models/signin';
 import serialize from '../serializers/signin';
 import event from '../event';
@@ -23,7 +23,7 @@ export default async (req: express.Request, res: express.Response) => {
 	}
 
 	// Fetch user
-	const user = await User.findOne({
+	const user: IUser = await User.findOne({
 		username_lower: username.toLowerCase()
 	}, {
 		fields: {
diff --git a/src/api/private/signup.ts b/src/api/private/signup.ts
index 2375c22845..bcc17a876d 100644
--- a/src/api/private/signup.ts
+++ b/src/api/private/signup.ts
@@ -1,10 +1,10 @@
 import * as express from 'express';
 import * as bcrypt from 'bcryptjs';
-import rndstr from 'rndstr';
 import recaptcha = require('recaptcha-promise');
-import User from '../models/user';
+import { default as User, IUser } from '../models/user';
 import { validateUsername, validatePassword } from '../models/user';
 import serialize from '../serializers/user';
+import generateUserToken from '../common/generate-native-user-token';
 import config from '../../conf';
 
 recaptcha.init({
@@ -58,10 +58,10 @@ export default async (req: express.Request, res: express.Response) => {
 	const hash = bcrypt.hashSync(password, salt);
 
 	// Generate secret
-	const secret = `!${rndstr('a-zA-Z0-9', 32)}`;
+	const secret = generateUserToken();
 
 	// Create account
-	const account = await User.insert({
+	const account: IUser = await User.insert({
 		token: secret,
 		avatar_id: null,
 		banner_id: null,
diff --git a/src/api/serializers/channel.ts b/src/api/serializers/channel.ts
new file mode 100644
index 0000000000..3cba39aa16
--- /dev/null
+++ b/src/api/serializers/channel.ts
@@ -0,0 +1,66 @@
+/**
+ * Module dependencies
+ */
+import * as mongo from 'mongodb';
+import deepcopy = require('deepcopy');
+import { IUser } from '../models/user';
+import { default as Channel, IChannel } from '../models/channel';
+import Watching from '../models/channel-watching';
+
+/**
+ * Serialize a channel
+ *
+ * @param channel target
+ * @param me? serializee
+ * @return response
+ */
+export default (
+	channel: string | mongo.ObjectID | IChannel,
+	me?: string | mongo.ObjectID | IUser
+) => new Promise<any>(async (resolve, reject) => {
+
+	let _channel: any;
+
+	// Populate the channel if 'channel' is ID
+	if (mongo.ObjectID.prototype.isPrototypeOf(channel)) {
+		_channel = await Channel.findOne({
+			_id: channel
+		});
+	} else if (typeof channel === 'string') {
+		_channel = await Channel.findOne({
+			_id: new mongo.ObjectID(channel)
+		});
+	} else {
+		_channel = deepcopy(channel);
+	}
+
+	// Rename _id to id
+	_channel.id = _channel._id;
+	delete _channel._id;
+
+	// Remove needless properties
+	delete _channel.user_id;
+
+	// 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;
+
+	if (me) {
+		//#region Watchしているかどうか
+		const watch = await Watching.findOne({
+			user_id: meId,
+			channel_id: _channel.id,
+			deleted_at: { $exists: false }
+		});
+
+		_channel.is_watching = watch !== null;
+		//#endregion
+	}
+
+	resolve(_channel);
+});
diff --git a/src/api/serializers/drive-file.ts b/src/api/serializers/drive-file.ts
index b4e2ab064a..2af7db5726 100644
--- a/src/api/serializers/drive-file.ts
+++ b/src/api/serializers/drive-file.ts
@@ -31,44 +31,40 @@ export default (
 	if (mongo.ObjectID.prototype.isPrototypeOf(file)) {
 		_file = await DriveFile.findOne({
 			_id: file
-		}, {
-				fields: {
-					data: false
-				}
-			});
+		});
 	} else if (typeof file === 'string') {
 		_file = await DriveFile.findOne({
 			_id: new mongo.ObjectID(file)
-		}, {
-				fields: {
-					data: false
-				}
-			});
+		});
 	} else {
 		_file = deepcopy(file);
 	}
 
-	// Rename _id to id
-	_file.id = _file._id;
-	delete _file._id;
+	if (!_file) return reject('invalid file arg.');
+
+	// rendered target
+	let _target: any = {};
+
+	_target.id = _file._id;
+	_target.created_at = _file.uploadDate;
 
-	delete _file.data;
+	_target = Object.assign(_target, _file.metadata);
 
-	_file.url = `${config.drive_url}/${_file.id}/${encodeURIComponent(_file.name)}`;
+	_target.url = `${config.drive_url}/${_target.id}/${encodeURIComponent(_target.name)}`;
 
-	if (opts.detail && _file.folder_id) {
+	if (opts.detail && _target.folder_id) {
 		// Populate folder
-		_file.folder = await serializeDriveFolder(_file.folder_id, {
+		_target.folder = await serializeDriveFolder(_target.folder_id, {
 			detail: true
 		});
 	}
 
-	if (opts.detail && _file.tags) {
+	if (opts.detail && _target.tags) {
 		// Populate tags
-		_file.tags = await _file.tags.map(async (tag: any) =>
+		_target.tags = await _target.tags.map(async (tag: any) =>
 			await serializeDriveTag(tag)
 		);
 	}
 
-	resolve(_file);
+	resolve(_target);
 });
diff --git a/src/api/serializers/drive-folder.ts b/src/api/serializers/drive-folder.ts
index a428464108..6ebf454a28 100644
--- a/src/api/serializers/drive-folder.ts
+++ b/src/api/serializers/drive-folder.ts
@@ -44,7 +44,7 @@ const self = (
 		});
 
 		const childFilesCount = await DriveFile.count({
-			folder_id: _folder.id
+			'metadata.folder_id': _folder.id
 		});
 
 		_folder.folders_count = childFoldersCount;
diff --git a/src/api/serializers/post.ts b/src/api/serializers/post.ts
index 3c96884dd1..03fd120772 100644
--- a/src/api/serializers/post.ts
+++ b/src/api/serializers/post.ts
@@ -3,33 +3,45 @@
  */
 import * as mongo from 'mongodb';
 import deepcopy = require('deepcopy');
-import Post from '../models/post';
+import { default as Post, IPost } from '../models/post';
 import Reaction from '../models/post-reaction';
+import { IUser } from '../models/user';
 import Vote from '../models/poll-vote';
 import serializeApp from './app';
+import serializeChannel from './channel';
 import serializeUser from './user';
 import serializeDriveFile from './drive-file';
 import parse from '../common/text';
+import rap from '@prezzemolo/rap';
 
 /**
  * Serialize a post
  *
- * @param {any} post
- * @param {any} me?
- * @param {any} options?
- * @return {Promise<any>}
+ * @param post target
+ * @param me? serializee
+ * @param options? serialize options
+ * @return response
  */
-const self = (
-	post: any,
-	me?: any,
+const self = async (
+	post: string | mongo.ObjectID | IPost,
+	me?: string | mongo.ObjectID | IUser,
 	options?: {
 		detail: boolean
 	}
-) => new Promise<any>(async (resolve, reject) => {
+) => {
 	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
@@ -45,6 +57,8 @@ const self = (
 		_post = deepcopy(post);
 	}
 
+	if (!_post) throw 'invalid post arg.';
+
 	const id = _post._id;
 
 	// Rename _id to id
@@ -59,62 +73,120 @@ const self = (
 	}
 
 	// Populate user
-	_post.user = await serializeUser(_post.user_id, me);
+	_post.user = serializeUser(_post.user_id, meId);
 
 	// Populate app
 	if (_post.app_id) {
-		_post.app = await serializeApp(_post.app_id);
+		_post.app = serializeApp(_post.app_id);
 	}
 
-	if (_post.media_ids) {
-		// Populate media
-		_post.media = await Promise.all(_post.media_ids.map(async fileId =>
-			await serializeDriveFile(fileId)
-		));
+	// Populate channel
+	if (_post.channel_id) {
+		_post.channel = serializeChannel(_post.channel_id);
 	}
 
-	if (_post.reply_to_id && opts.detail) {
-		// Populate reply to post
-		_post.reply_to = await self(_post.reply_to_id, me, {
-			detail: false
-		});
+	// Populate media
+	if (_post.media_ids) {
+		_post.media = Promise.all(_post.media_ids.map(fileId =>
+			serializeDriveFile(fileId)
+		));
 	}
 
-	if (_post.repost_id && opts.detail) {
-		// Populate repost
-		_post.repost = await self(_post.repost_id, me, {
-			detail: _post.text == null
-		});
-	}
+	// When requested a detailed post data
+	if (opts.detail) {
+		// Get previous post info
+		_post.prev = (async () => {
+			const prev = await Post.findOne({
+				user_id: _post.user_id,
+				_id: {
+					$lt: id
+				}
+			}, {
+				fields: {
+					_id: true
+				},
+				sort: {
+					_id: -1
+				}
+			});
+			return prev ? prev._id : null;
+		})();
 
-	// Poll
-	if (me && _post.poll && opts.detail) {
-		const vote = await Vote
-			.findOne({
-				user_id: me._id,
-				post_id: id
+		// Get next post info
+		_post.next = (async () => {
+			const next = await Post.findOne({
+				user_id: _post.user_id,
+				_id: {
+					$gt: id
+				}
+			}, {
+				fields: {
+					_id: true
+				},
+				sort: {
+					_id: 1
+				}
 			});
+			return next ? next._id : null;
+		})();
 
-		if (vote != null) {
-			_post.poll.choices.filter(c => c.id == vote.choice)[0].is_voted = true;
+		if (_post.reply_id) {
+			// Populate reply to post
+			_post.reply = self(_post.reply_id, meId, {
+				detail: false
+			});
 		}
-	}
 
-	// Fetch my reaction
-	if (me && opts.detail) {
-		const reaction = await Reaction
-			.findOne({
-				user_id: me._id,
-				post_id: id,
-				deleted_at: { $exists: false }
+		if (_post.repost_id) {
+			// Populate repost
+			_post.repost = self(_post.repost_id, meId, {
+				detail: _post.text == null
 			});
+		}
+
+		// Poll
+		if (meId && _post.poll) {
+			_post.poll = (async (poll) => {
+				const vote = await Vote
+					.findOne({
+						user_id: meId,
+						post_id: id
+					});
+
+				if (vote != null) {
+					const myChoice = poll.choices
+						.filter(c => c.id == vote.choice)[0];
+
+					myChoice.is_voted = true;
+				}
 
-		if (reaction) {
-			_post.my_reaction = reaction.reaction;
+				return poll;
+			})(_post.poll);
+		}
+
+		// Fetch my reaction
+		if (meId) {
+			_post.my_reaction = (async () => {
+				const reaction = await Reaction
+					.findOne({
+						user_id: meId,
+						post_id: id,
+						deleted_at: { $exists: false }
+					});
+
+				if (reaction) {
+					return reaction.reaction;
+				}
+
+				return null;
+			})();
 		}
 	}
 
-	resolve(_post);
-});
+	// resolve promises in _post object
+	_post = await rap(_post);
+
+	return _post;
+};
 
 export default self;
diff --git a/src/api/serializers/user.ts b/src/api/serializers/user.ts
index bdbc749589..0d24d6cc04 100644
--- a/src/api/serializers/user.ts
+++ b/src/api/serializers/user.ts
@@ -3,22 +3,24 @@
  */
 import * as mongo from 'mongodb';
 import deepcopy = require('deepcopy');
-import User from '../models/user';
+import { default as User, IUser } from '../models/user';
+import serializePost from './post';
 import Following from '../models/following';
 import getFriends from '../common/get-friends';
 import config from '../../conf';
+import rap from '@prezzemolo/rap';
 
 /**
  * Serialize a user
  *
- * @param {any} user
- * @param {any} me?
- * @param {any} options?
- * @return {Promise<any>}
+ * @param user target
+ * @param me? serializee
+ * @param options? serialize options
+ * @return response
  */
 export default (
-	user: any,
-	me?: any,
+	user: string | mongo.ObjectID | IUser,
+	me?: string | mongo.ObjectID | IUser,
 	options?: {
 		detail?: boolean,
 		includeSecrets?: boolean
@@ -36,7 +38,9 @@ export default (
 		data: false
 	} : {
 		data: false,
-		profile: false
+		profile: false,
+		keywords: false,
+		domains: false
 	};
 
 	// Populate the user if 'user' is ID
@@ -52,14 +56,16 @@ export default (
 		_user = deepcopy(user);
 	}
 
+	if (!_user) return reject('invalid user arg.');
+
 	// Me
-	if (me && !mongo.ObjectID.prototype.isPrototypeOf(me)) {
-		if (typeof me === 'string') {
-			me = new mongo.ObjectID(me);
-		} else {
-			me = me._id;
-		}
-	}
+	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;
 
 	// Rename _id to id
 	_user.id = _user._id;
@@ -76,6 +82,7 @@ export default (
 		delete _user.twitter.access_token;
 		delete _user.twitter.access_token_secret;
 	}
+	delete _user.line;
 
 	// Visible via only the official client
 	if (!opts.includeSecrets) {
@@ -91,51 +98,65 @@ export default (
 		? `${config.drive_url}/${_user.banner_id}`
 		: null;
 
-	if (!me || !me.equals(_user.id) || !opts.detail) {
+	if (!meId || !meId.equals(_user.id) || !opts.detail) {
 		delete _user.avatar_id;
 		delete _user.banner_id;
 
 		delete _user.drive_capacity;
 	}
 
-	if (me && !me.equals(_user.id)) {
+	if (meId && !meId.equals(_user.id)) {
 		// If the user is following
-		const follow = await Following.findOne({
-			follower_id: me,
-			followee_id: _user.id,
-			deleted_at: { $exists: false }
-		});
-		_user.is_following = follow !== null;
+		_user.is_following = (async () => {
+			const follow = await Following.findOne({
+				follower_id: meId,
+				followee_id: _user.id,
+				deleted_at: { $exists: false }
+			});
+			return follow !== null;
+		})();
 
 		// If the user is followed
-		const follow2 = await Following.findOne({
-			follower_id: _user.id,
-			followee_id: me,
-			deleted_at: { $exists: false }
-		});
-		_user.is_followed = follow2 !== null;
+		_user.is_followed = (async () => {
+			const follow2 = await Following.findOne({
+				follower_id: _user.id,
+				followee_id: meId,
+				deleted_at: { $exists: false }
+			});
+			return follow2 !== null;
+		})();
 	}
 
-	if (me && !me.equals(_user.id) && opts.detail) {
-		const myFollowingIds = await getFriends(me);
+	if (opts.detail) {
+		if (_user.pinned_post_id) {
+			// Populate pinned post
+			_user.pinned_post = serializePost(_user.pinned_post_id, meId, {
+				detail: true
+			});
+		}
+
+		if (meId && !meId.equals(_user.id)) {
+			const myFollowingIds = await getFriends(meId);
 
-		// Get following you know count
-		const followingYouKnowCount = await Following.count({
-			followee_id: { $in: myFollowingIds },
-			follower_id: _user.id,
-			deleted_at: { $exists: false }
-		});
-		_user.following_you_know_count = followingYouKnowCount;
+			// Get following you know count
+			_user.following_you_know_count = Following.count({
+				followee_id: { $in: myFollowingIds },
+				follower_id: _user.id,
+				deleted_at: { $exists: false }
+			});
 
-		// Get followers you know count
-		const followersYouKnowCount = await Following.count({
-			followee_id: _user.id,
-			follower_id: { $in: myFollowingIds },
-			deleted_at: { $exists: false }
-		});
-		_user.followers_you_know_count = followersYouKnowCount;
+			// Get followers you know count
+			_user.followers_you_know_count = Following.count({
+				followee_id: _user.id,
+				follower_id: { $in: myFollowingIds },
+				deleted_at: { $exists: false }
+			});
+		}
 	}
 
+	// resolve promises in _user object
+	_user = await rap(_user);
+
 	resolve(_user);
 });
 /*
diff --git a/src/api/server.ts b/src/api/server.ts
index c98167eb3e..3de32d9eab 100644
--- a/src/api/server.ts
+++ b/src/api/server.ts
@@ -19,7 +19,12 @@ app.disable('x-powered-by');
 app.set('etag', false);
 app.use(bodyParser.urlencoded({ extended: true }));
 app.use(bodyParser.json({
-	type: ['application/json', 'text/plain']
+	type: ['application/json', 'text/plain'],
+	verify: (req, res, buf, encoding) => {
+		if (buf && buf.length) {
+			(req as any).rawBody = buf.toString(encoding || 'utf8');
+		}
+	}
 }));
 app.use(cors({
 	origin: true
@@ -54,4 +59,6 @@ app.use((req, res, next) => {
 require('./service/github')(app);
 require('./service/twitter')(app);
 
+require('./bot/interfaces/line')(app);
+
 module.exports = app;
diff --git a/src/api/service/github.ts b/src/api/service/github.ts
index a631808ba5..1c78267c0f 100644
--- a/src/api/service/github.ts
+++ b/src/api/service/github.ts
@@ -111,12 +111,12 @@ module.exports = async (app: express.Application) => {
 
 	handler.on('watch', event => {
 		const sender = event.sender;
-		post(`Starred by **${sender.login}**`);
+		post(`⭐️ Starred by **${sender.login}** ⭐️`);
 	});
 
 	handler.on('fork', event => {
 		const repo = event.forkee;
-		post(`Forked:\n${repo.html_url}`);
+		post(`🍴 Forked:\n${repo.html_url} 🍴`);
 	});
 
 	handler.on('pull_request', event => {
diff --git a/src/api/stream/channel.ts b/src/api/stream/channel.ts
new file mode 100644
index 0000000000..d67d77cbf4
--- /dev/null
+++ b/src/api/stream/channel.ts
@@ -0,0 +1,12 @@
+import * as websocket from 'websocket';
+import * as redis from 'redis';
+
+export default function(request: websocket.request, connection: websocket.connection, subscriber: redis.RedisClient): void {
+	const channel = request.resourceURL.query.channel;
+
+	// Subscribe channel stream
+	subscriber.subscribe(`misskey:channel-stream:${channel}`);
+	subscriber.on('message', (_, data) => {
+		connection.send(data);
+	});
+}
diff --git a/src/api/stream/home.ts b/src/api/stream/home.ts
index 2ab8d3025b..7c8f3bfec8 100644
--- a/src/api/stream/home.ts
+++ b/src/api/stream/home.ts
@@ -2,7 +2,9 @@ import * as websocket from 'websocket';
 import * as redis from 'redis';
 import * as debug from 'debug';
 
+import User from '../models/user';
 import serializePost from '../serializers/post';
+import readNotification from '../common/read-notification';
 
 const log = debug('misskey');
 
@@ -35,6 +37,20 @@ export default function homeStream(request: websocket.request, connection: webso
 		const msg = JSON.parse(data.utf8Data);
 
 		switch (msg.type) {
+			case 'alive':
+				// Update lastUsedAt
+				User.update({ _id: user._id }, {
+					$set: {
+						last_used_at: new Date()
+					}
+				});
+				break;
+
+			case 'read_notification':
+				if (!msg.id) return;
+				readNotification(user._id, msg.id);
+				break;
+
 			case 'capture':
 				if (!msg.id) return;
 				const postId = msg.id;
diff --git a/src/api/stream/server.ts b/src/api/stream/server.ts
index 6de5337499..0db6643d40 100644
--- a/src/api/stream/server.ts
+++ b/src/api/stream/server.ts
@@ -14,7 +14,6 @@ export default function homeStream(request: websocket.request, connection: webso
 	ev.addListener('stats', onStats);
 
 	connection.on('close', () => {
-		console.log('yooo');
 		ev.removeListener('stats', onStats);
 	});
 }
diff --git a/src/api/streaming.ts b/src/api/streaming.ts
index c71132100c..0e512fb210 100644
--- a/src/api/streaming.ts
+++ b/src/api/streaming.ts
@@ -2,13 +2,14 @@ import * as http from 'http';
 import * as websocket from 'websocket';
 import * as redis from 'redis';
 import config from '../conf';
-import User from './models/user';
+import { default as User, IUser } from './models/user';
 import AccessToken from './models/access-token';
 import isNativeToken from './common/is-native-token';
 
 import homeStream from './stream/home';
 import messagingStream from './stream/messaging';
 import serverStream from './stream/server';
+import channelStream from './stream/channel';
 
 module.exports = (server: http.Server) => {
 	/**
@@ -26,14 +27,6 @@ module.exports = (server: http.Server) => {
 			return;
 		}
 
-		const user = await authenticate(connection, request.resourceURL.query.i);
-
-		if (user == null) {
-			connection.send('authentication-failed');
-			connection.close();
-			return;
-		}
-
 		// Connect to Redis
 		const subscriber = redis.createClient(
 			config.redis.port, config.redis.host);
@@ -43,6 +36,19 @@ module.exports = (server: http.Server) => {
 			subscriber.quit();
 		});
 
+		if (request.resourceURL.pathname === '/channel') {
+			channelStream(request, connection, subscriber);
+			return;
+		}
+
+		const user = await authenticate(request.resourceURL.query.i);
+
+		if (user == null) {
+			connection.send('authentication-failed');
+			connection.close();
+			return;
+		}
+
 		const channel =
 			request.resourceURL.pathname === '/' ? homeStream :
 			request.resourceURL.pathname === '/messaging' ? messagingStream :
@@ -56,7 +62,11 @@ module.exports = (server: http.Server) => {
 	});
 };
 
-function authenticate(connection: websocket.connection, token: string): Promise<any> {
+/**
+ * 接続してきたユーザーを取得します
+ * @param token 送信されてきたトークン
+ */
+function authenticate(token: string): Promise<IUser> {
 	if (token == null) {
 		return Promise.resolve(null);
 	}
@@ -64,8 +74,7 @@ function authenticate(connection: websocket.connection, token: string): Promise<
 	return new Promise(async (resolve, reject) => {
 		if (isNativeToken(token)) {
 			// Fetch user
-			// SELECT _id
-			const user = await User
+			const user: IUser = await User
 				.findOne({
 					token: token
 				});
@@ -81,13 +90,8 @@ function authenticate(connection: websocket.connection, token: string): Promise<
 			}
 
 			// Fetch user
-			// SELECT _id
-			const user = await User
-				.findOne({ _id: accessToken.user_id }, {
-					fields: {
-						_id: true
-					}
-				});
+			const user: IUser = await User
+				.findOne({ _id: accessToken.user_id });
 
 			resolve(user);
 		}