LINE Messageing API recipient fetcher

A small NodeJS utils for LINE bot webhook for fetching recipient ID.

According to LINE Messaging API Documention, recipient ID can be groupID, userID or roomID, it will be used in LibreNMS to send message to a group or a user. Here is the step to get it.

How to use?

Here is the step for setup a line notify.

Step 1. Go to Line developers and register an account.

https://developers.line.biz/

Using your real Line account to register.

Step 2. Add a new channel

1. Create a provider if you don't have.

2. Create a channel, choosing Messaging API, and continue fill up the forms.

   • Channel type: Messaging API
   • Provider: (Choose your provider)
   • Company or owner's country or region: (Choose your region)
   • Channel name:
     (It will be your LINE bot's name by default, it cannot edit it later )
   • Channel description:
     (It will be your LINE bot's description by default)
   • Category: (Choose a proper category)
   • Subcategory: (Choose a proper subcategory)

   then create it.

3. Go to "Messaging API" tab of your channel, here listing some important value.

   • Bot basic ID and QR code is your LINE bot's ID and QR code.
   • Channel access token (long-lived), will use it later, keep it safe.

4. Use your real Line account add your LINE bot as a friend.

Step 3. Setup a webhook to fetch recipient ID

Using following small NodeJS program and ngrok for temporally https. Following step is using Mac for demonstration. Linux also can be apply these steps.

1. Open a folder

   $ mkdir myLineBot
   

2. Do npm initialize

   $ npm init -y
   

3. Install express package

   $ npm install express
   

4. Add and edit index.js

   $ vi index.js
   

   The index.js contents is on gist.

5. Run the program

   $ node index.js
   

6. using ngrok expose port to public

   $ ngrok http 3000
   

7. Go to "Messaging API" tab of your channel, fill up Webhook URL to https://<your ngrok domain>/webhook

8. If you want to let LINE bot send message to a yourself, use your real account to send a message to your LINE bot. Program will print out the userID in console.

   sample value:

   {"type":"user","userId":"U527xxxxxxxxxxxxxxxxxxxxxxxxxc0ee"}
   

9. If you want to let LINE bot send message to a group, do the following steps.

   • Add your LINE bot into group
   • Use your real account to send a message to group

   Program will print out the groupID in console, it will be Recipient ID, keep it safe.

   sample value:

   {"type":"group","groupId":"Ce51xxxxxxxxxxxxxxxxxxxxxxxxxx6ef","userId":"U527xxxxxxxxxxxxxxxxxxxxxxxxxc0ee"}