Update app.js

Delete app_mother_legacy.js

-var express = require('express');
-var app = express();
-const line = require('@line/bot-sdk');
-
-
-//papago api
-var request = require('request');
-
-//번역 api_url
-var translate_api_url = 'https://openapi.naver.com/v1/papago/n2mt';
-
-//언어감지 api_url
-var languagedetect_api_url = 'https://openapi.naver.com/v1/papago/detectLangs'
-
-// Naver Auth Key
-//새로 발급받은 naver papago api id, pw 입력
-var client_id = 'xZMx34y7uru1v8lywZ2d';
-var client_secret = 'p6L7M7WsH9';
-
-const config = {
-  channelAccessToken: 'mnny0MJSezgBXzR9C3Ddcc1Csdb7Y9jkvy2nqV5saOmvR2YOJ1/kj/2M0CNsLA+57B2qDpdUQ7WbCTtIKx/LAJ6Kwfop4tX3up7EM8H9EZK1td6GMbhhCb6wvUFVdb1PcTO4joCv8mspd3ubo8a+gAdB04t89/1O/w1cDnyilFU=',
-  channelSecret: 'bde77633a16fc5bfbd532d5990c6170e',
-};
-
-
-// create LINE SDK client
-const client = new line.Client(config);
-
-// create Express app
-// about Express itself: https://expressjs.com/
-
-// register a webhook handler with middleware
-// about the middleware, please refer to doc
-app.post('/webhook', line.middleware(config), (req, res) => {
-  Promise
-    .all(req.body.events.map(handleEvent))
-    .then((result) => res.json(result))
-    .catch((err) => {
-      console.error(err);
-      res.status(200).end();
-    });
-});
-
-// event handler
-function handleEvent(event) {
-  if (event.type !== 'message' || event.message.type !== 'text') {
-    // ignore non-text-message event
-    return Promise.resolve(null);
-  }
-  return new Promise(function(resolve, reject) {
-    //언어 감지 option
-    var detect_options = {
-      url : languagedetect_api_url,
-      form : {'query': event.message.text},
-      headers: {'X-Naver-Client-Id': client_id, 'X-Naver-Client-Secret': client_secret}
-    };
-
-    //papago 언어 감지
-    request.post(detect_options,function(error,response,body){
-      console.log(response.statusCode);
-      if(!error && response.statusCode == 200){
-        var detect_body = JSON.parse(response.body);
-        var source = '';
-        var target = '';
-        var result = { type: 'text', text:''};
-
-        //언어 감지가 제대로 됐는지 확인
-        console.log(detect_body.langCode);
-
-
-        //번역은 한국어->영어 / 영어->한국어만 지원
-        if(detect_body.langCode == 'ko'||detect_body.langCode == 'en'){
-          source = detect_body.langCode == 'ko' ? 'ko':'en';
-          target = source == 'ko' ? 'en':'ko';
-          //papago 번역 option
-          var options = {
-              url:  translate_api_url,
-              // 한국어(source : ko), 영어(target: en), 카톡에서 받는 메시지(text)
-              form: {'source':source, 'target':target, 'text':event.message.text},
-              headers: {'X-Naver-Client-Id': client_id, 'X-Naver-Client-Secret': client_secret}
-          };
-
-          // Naver Post API
-          request.post(options, function(error, response, body){
-              // Translate API Sucess
-              if(!error && response.statusCode == 200){
-                  // JSON
-                  var objBody = JSON.parse(response.body);
-                  // Message 잘 찍히는지 확인
-
-                  result.text = objBody.message.result.translatedText;
-                  console.log(result.text);
-                  //번역된 문장 보내기
-                  client.replyMessage(event.replyToken,result).then(resolve).catch(reject);
-              }
-          });
-        }
-        // 메시지의 언어가 영어 또는 한국어가 아닐 경우
-        else{
-          result.text = '언어를 감지할 수 없습니다. \n 번역 언어는 한글 또는 영어만 가능합니다.';
-          client.replyMessage(event.replyToken,result).then(resolve).catch(reject);
-        }
-
-      }
-
-    });
-
-    });
-  }
-
-app.listen(3000, function () {
-  console.log('Linebot listening on port 3000!');
-});