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src/api/bot/interfaces/line.ts

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+import * as EventEmitter from 'events';
+import * as express from 'express';
+import * as crypto from 'crypto';
+//import User from '../../models/user';
+import config from '../../../conf';
+/*import BotCore from '../core';
+
+const sessions: {
+	userId: string;
+	session: BotCore;
+}[] = [];
+*/
+module.exports = async (app: express.Application) => {
+	if (config.line_bot == null) return;
+
+	const handler = new EventEmitter();
+
+	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(JSON.stringify(req.body));
+
+		const sig2 = hash.digest('base64');
+
+		// シグネチャ比較
+		if (sig1 === sig2) {
+			console.log(req.body);
+			handler.emit(req.body.type);
+			res.sendStatus(200);
+		} else {
+			res.sendStatus(400);
+		}
+	});
+};