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# 建立LINE bot

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### 什麼是LINE bot

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讓LINE帳號可以接收用戶訊息並自動回傳訊息的應用程式，也就是LINE的聊天機器人

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#### 如何運作

當使用者傳了一個訊息時，會透過LINE Platform 傳一個 request 到設定的webhook，應用程式會透過 Messaging API 去處理及傳遞 request 到 LINE Platform 然後回應給使用者，這些 request 必須透過 HTTPS 去傳遞

[原文](https://developers.line.me/en/docs/messaging-api/overview/)

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#### Messaging API 可以做什麼

- Send reply messages
- Send push messages
- Send various message types
-- including [text](https://developers.line.me/en/docs/messaging-api/message-types#text-messages), [stickers](https://developers.line.me/en/docs/messaging-api/message-types#stickers), [images](https://developers.line.me/en/docs/messaging-api/message-types#image), [videos](https://developers.line.me/en/docs/messaging-api/message-types#video), [audio](https://developers.line.me/en/docs/messaging-api/message-types#audio), [location](https://developers.line.me/en/docs/messaging-api/message-types#location), [imagemaps](https://developers.line.me/en/docs/messaging-api/message-types#imagemap-messages), and [template](https://developers.line.me/en/docs/messaging-api/message-types#template-messages) messages

- Get user profiles
-- You can get users' display names, profile images and status messages.

- Join group chats

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### 建立LINE bot

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#### 需求

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- Line bot帳號
- https server(使用heroku，LINE 官方示範)
- Node.js >= 4, preferably >=6
- npm preferably >=5

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- [登入LINE帳號](https://developers.line.me/en/)
- 建立provider
- 建立bot channel

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### 建立heroku帳號

- [註冊帳號](https://www.heroku.com/home)
- 建立app

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### 設定LINE bot未完成的部分


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### 建立專案

- `mkdir line-bot && cd line-bot`

- `npm init`
- `npm install --save express @line/bot-sdk`
- `touch index.js .gitignore`

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

const config = {
  channelAccessToken: '比較長的那串',
  channelSecret: '比較短的'
};

const app = express();
app.post('/', line.middleware(config), (req, res) => {
  Promise
    .all(req.body.events.map(handleEvent))
    .then((result) => res.json(result));
});

const client = new line.Client(config);
function handleEvent(event) {
  if (event.type !== 'message' || event.message.type !== 'text') {
    return Promise.resolve(null);
  }

  return client.replyMessage(event.replyToken, {
    type: 'text',
    text: event.message.text
  });
}

app.listen(process.env.PORT || 8080, function() {
  console.log("App now running on port");
});

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在package.json加上 "start":"node index.js"

"scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node index.js"
  },

記得在.gitignore裡，加上node_modules

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`git add .`
`git commit -m 'init'`
`git push https://git.heroku.com/linedemobot.git
master`

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### 參考

- [line-bot-sdk-nodejs](https://line.github.io/line-bot-sdk-nodejs/)
- [](https://developers.line.me/en/)