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In this second tutorial, I am sharing about the coding part to make the telegram bot. In the previous video, I share about getting the necessary keys to use to make this bot; now in this tutorial, I will make use of the keys to create the bot.

About this tutorial

This is a tutorial of making a telegram bot on top of steem blockchain. The bot will watch for all the post on steemit and when there is a post with a tag of "contest" and "teammalaysia", it till notify out in telegram.

This bot solves the issue of not noticing a certain contest being announced, and when you want to participate it but it is over.

The dependencies:

• node-telegram-bot-api - an API layer for telegram with Node.js
• steem - Official Steem API
• dotenv - a library to use .env file

Setup the bot

• install all dependencies (npm install or yarn install)

• create a .env file (refer to .env.sample )

CHANNEL_ID=-100<CHANNEL_ID>
BOT_KEY=<API_KEY>

• depends on what tag you want to watch. (in this example, I use "teammalaysia" and "contest")

if (
      tags.includes('contest') &&
      tags.includes('teammalaysia')
    )

• To run it, just node index.js.

For production, you can use the PM2 library.

Full source code

const telegram = require('node-telegram-bot-api');
const steem = require('steem');
const dotenv = require('dotenv');

dotenv.config();

const bot = new telegram(process.env.BOT_KEY, {
  polling: true
});

steem.api.streamTransactions('head', function(err, result) {
  if (err) {
    return;
  }

  let txType = result.operations[0][0];
  let txData = result.operations[0][1];

  // Check a post and it is not being resteem
  if (txType === 'comment' && txData.parent_author === '') {
    let tags;

    try {
      tags = JSON.parse(txData.json_metadata).tags;
    } catch (e) {
      return;
    }

    if (
      tags.includes('contest') &&
      tags.includes('teammalaysia')
    ) {
      let link = `@${txData.author}/${txData.permlink}`;

      bot.sendMessage(
        process.env.CHANNEL_ID,
        `https://steemit.com/${link}`
      );
    }
  }
});

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