Implement basic line webhook

 data
 data
-.ipynb_checkpoints
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+.ipynb_checkpoints
+node_modules
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+const express = require('express');
+const app = express();
+const mysql = require('mysql2/promise');
+const axios = require('axios').default;
+const bodyParser = require('body-parser');
+
+app.use(bodyParser.json());
+
+const channelToken = 'Bearer ZVI571ynUAVT0U44734ziyjVtStYiUi2UA4txCgVUvugv5YQwToMDgE991Sd4UbsZtJpBhXEtQKX/YkvQVx0PgH9F7qy75eUR0iKMwz33RXD5BG8JuFZ67FqR/GXZQNSk+kXHMBVnCQPeeNqTNn5MgdB04t89/1O/w1cDnyilFU=';
+
+const pool = mysql.createPool({
+    host: 'localhost',
+    user: 'root',
+    password: '0712',
+    database: 'tft'
+});
+
+app.post('/messages', function(req, res) {
+    for(let event of req.body.events) {
+        if(event.type == 'message')
+            onMessage(event.message, event.replyToken);
+    }
+
+    res.sendStatus(200);
+});
+
+function onMessage(message, replyToken) {
+    if(message.type != 'text')
+        return;
+    
+    let sql = 'SELECT i.`name` FROM `character_items` c JOIN `items` i ON c.`item`=i.`id` WHERE c.`character_id`=? ORDER BY c.`count` DESC LIMIT 0,5';
+    pool.query(sql, [message.text]).then(function([results]) {
+        let reply;
+        if(results.length == 0)
+            reply = '데이터가 없습니다.';
+        else
+            reply = `${message.text}의 추천 아이템은 ${results.map(e => e.name).join(', ')} 입니다.`;
+
+        axios.post('https://api.line.me/v2/bot/message/reply', {
+            replyToken: replyToken,
+            messages: [{type: 'text', text: reply}]
+        }, {
+            headers: {'Authorization': channelToken}
+        });
+    });
+}
+
+app.listen(3000, () => console.log('TFT Chatbot started'));
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+{
+  "name": "tft-chatbot",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^0.21.0",
+    "body-parser": "^1.19.0",
+    "express": "^4.17.1",
+    "mysql2": "^2.2.5"
+  }
+}