apply https

+const express = require('express');
+
+const app = express();
+
+app.get('/', (req, res) => {
+  res.send('Hello world!');
+});
+
+module.exports = app;
\ No newline at end of file

+const fs = require('fs');
+const path = require('path');
+
+const domain = '2020105640.oss-2021.tk';
+
+module.exports = {
+    LINE: {
+        URL: {
+            NOTIFY: 'https://notify-api.line.me/api/notify',
+        },
+        TOKEN: 'Cu3yosmWtXOPBhjccMCdJj2YH1g5KF8rhBv0zHZyqj3uYOrHSPYkixI+6SP7bfZOdC8J4xwhOriJahHtLxsQxUMnTaanncGyAyTFyD9+18gvzEcS39plUIadREyL38HoY/9o6O3a3guSOMxyiT+cJQdB04t89/1O/w1cDnyilFU=',
+    },
+    CONFIG: {
+        PORT: 443,
+        HTTPS_OPTIONS: {
+            ca: fs.readFileSync(`/etc/letsencrypt/live/${domain}/fullchain.pem`),
+            key: fs.readFileSync(path.resolve(process.cwd(), `/etc/letsencrypt/live/${domain}/privkey.pem`), 'utf8').toString(),
+            cert: fs.readFileSync(path.resolve(process.cwd(), `/etc/letsencrypt/live/${domain}/cert.pem`), 'utf8').toString(),
+        }
+    }
+};
\ No newline at end of file

+const https = require('https');
+
+const app = require('./app');
+const constants = require('./constants');
+
+try {
+  const options = constants.CONFIG.HTTPS_OPTIONS;
+  https.createServer(options, app).listen(constants.CONFIG.PORT, () => {
+    console.log(`[SYSTEM] HTTPS server is running on port ${constants.CONFIG.PORT}`);
+  })
+} catch (err) {
+  console.log('[SYSTEM] Cannot start HTTPS server.');
+  console.log(err);
+}
\ No newline at end of file

@@ -2,11 +2,11 @@
   "name": "sweetday-dessert-chatbot",
   "version": "1.0.0",
   "description": "Chatbot based on Express.js, Line API",
-  "main": "app.js",
+  "main": "index.js",
   "scripts": {
-    "start": "node app.js",
-    "start:dev": "nodemon app.js",
-    "start:prod": "pm2 app.js",
+    "start": "node https/index.js",
+    "start:dev": "nodemon --watch https/ https/index.js",
+    "start:prod": "pm2 https/index.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {
@@ -23,5 +23,8 @@
   "license": "MIT",
   "dependencies": {
     "express": "^4.17.1"
+  },
+  "devDependencies":{
+    "nodemon": "^2.0.7"
   }
 }