Introduce processor

src/server/api/bot/interfaces/line.ts

@@ -0,0 +1,238 @@
+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 getAcct from '../../../common/user/get-acct';
+import parseAcct from '../../../common/user/parse-acct';
+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 ${config.line_bot.channel_access_token}`
+			},
+			json: {
+				replyToken: this.replyToken,
+				messages: messages
+			}
+		}, (err, res, body) => {
+			if (err) {
+				console.error(err);
+				return;
+			}
+		});
+	}
+
+	public async react(ev: any): Promise<void> {
+		this.replyToken = ev.replyToken;
+
+		switch (ev.type) {
+			// メッセージ
+			case 'message':
+				switch (ev.message.type) {
+					// テキスト
+					case 'text':
+						const res = await this.q(ev.message.text);
+						if (res == null) return;
+						// 返信
+						this.reply([{
+							type: 'text',
+							text: res
+						}]);
+						break;
+
+					// スタンプ
+					case 'sticker':
+						// スタンプで返信
+						this.reply([{
+							type: 'sticker',
+							packageId: '4',
+							stickerId: stickers[Math.floor(Math.random() * stickers.length)]
+						}]);
+						break;
+				}
+				break;
+
+			// postback
+			case 'postback':
+				const data = ev.postback.data;
+				const cmd = data.split('|')[0];
+				const arg = data.split('|')[1];
+				switch (cmd) {
+					case 'showtl':
+						this.showUserTimelinePostback(arg);
+						break;
+				}
+				break;
+		}
+	}
+
+	public static import(data) {
+		const bot = new LineBot();
+		bot._import(data);
+		return bot;
+	}
+
+	public async showUserCommand(q: string) {
+		const user = await require('../../endpoints/users/show')(parseAcct(q.substr(1)), this.user);
+
+		const acct = getAcct(user);
+		const actions = [];
+
+		actions.push({
+			type: 'postback',
+			label: 'タイムラインを見る',
+			data: `showtl|${user.id}`
+		});
+
+		if (user.account.twitter) {
+			actions.push({
+				type: 'uri',
+				label: 'Twitterアカウントを見る',
+				uri: `https://twitter.com/${user.account.twitter.screen_name}`
+			});
+		}
+
+		actions.push({
+			type: 'uri',
+			label: 'Webで見る',
+			uri: `${config.url}/@${acct}`
+		});
+
+		this.reply([{
+			type: 'template',
+			altText: await super.showUserCommand(q),
+			template: {
+				type: 'buttons',
+				thumbnailImageUrl: `${user.avatar_url}?thumbnail&size=1024`,
+				title: `${user.name} (@${acct})`,
+				text: user.description || '(no description)',
+				actions: actions
+			}
+		}]);
+
+		return null;
+	}
+
+	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({
+				host: null,
+				'account.line': {
+					user_id: sourceId
+				}
+			});
+
+			bot = new LineBot(user);
+
+			bot.on('signin', user => {
+				User.update(user._id, {
+					$set: {
+						'account.line': {
+							user_id: sourceId
+						}
+					}
+				});
+			});
+
+			bot.on('signout', user => {
+				User.update(user._id, {
+					$set: {
+						'account.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);
+		}
+	});
+};