ChatGPT - LINE Chatbot

app.js

const express = require('express');
const line = require('@line/bot-sdk');
const request = require('request');

const CHANNEL_ACCESS_TOKEN = 'YOUR_CHANNEL_ACCESS_TOKEN';
const CHANNEL_SECRET = 'YOUR_CHANNEL_SECRET';
const OPENAI_API_KEY = 'YOUR_OPENAI_API_KEY';

// 建立 LINE Bot 物件
const config = {
  channelAccessToken: CHANNEL_ACCESS_TOKEN,
  channelSecret: CHANNEL_SECRET
};
const bot = new line.Client(config);

// 建立 Express 實例
const app = express();

// 設定 webhook 處理函式
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(500).end();
    });
});

// 處理每個事件
function handleEvent(event) {
  if (event.type !== 'message' || event.message.type !== 'text') {
    // 若不是文字訊息則直接回應
    return Promise.resolve(null);
  }

  // 使用 OpenAI API 進行文字生成
  return new Promise((resolve, reject) => {
    request.post({
      url: 'https://api.openai.com/v1/completions',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${OPENAI_API_KEY}`
      },
      json: {
        model: 'text-davinci-003',
        prompt: event.message.text,
        temperature: 0.7,
        max_tokens: 1000,
        top_p: 1,
        frequency_penalty: 0,
        presence_penalty: 0
      }
    }, (error, response, body) => {
      if (error) {
        reject(error);
      } else {
        // 將 Chatbot 的回覆訊息發送給用戶
        resolve(bot.replyMessage(event.replyToken, {
          type: 'text',
          text: body.choices[0].text
        }));
      }
    });
  });
}

// 啟動伺服器
const port = process.env.PORT || 3000;
app.listen(port, () => {
  console.log(`Chatbot server is running on ${port}`);
});