bot.js

/*!
 * Bot.js
 * A Node JS Twitter bot that periodically searches for tweets and then like, reply and follow automatically.
 * The bot saves tweets ids already processed to avoid interact with the same ones again.
 * Version 1.0.0
 * Created by Carlos E. Torres (carlos.torres@cacira.com)
 * http://cacira.com
 * http://cetorres.com
 * Date: 02/09/2017
 */

// Create object reference to libs
var Twit = require('twit');
var fs = require('fs');

// Set Twitter API keys
var TWITTER_CONSUMER_KEY = '';
var TWITTER_CONSUMER_SECRET = '';
var TWITTER_ACCESS_TOKEN = '';
var TWITTER_ACCESS_TOKEN_SECRET = '';

// Database file
var DB_FILE = "bot_db.txt";

// Set interval time. Try to use a not so small interval to avoid Twitter to lock your account.
var INTERVAL = 3*60*60*1000; // 3 hours

// Set Twitter search phrase. You can use hash tags or simples text. Hash tags works better. Separate with OR or AND.
var TWITTER_SEARCH_PHRASE = '#AGoodHashTag OR #AnotherOne OR #MyGreatSearch';

// Set max number of tweets to get on the search results each time
var TWITTER_SEARCH_MAX_RESULTS = 20;

// Set tweets to reply
var TWEETS_TO_REPLY = [
	"Write something to reply.",
	"Bot will randomly pick one of the tweets to send.",
	"Try to be very natural and human like on the replies.",
	"Use the main Twitter handle you want to promote in all options. @MyHandle",
	"Create 5 to 10 replies. The more options the more natural bot will look."
];

// Init Twit lib
var Bot = new Twit({
	consumer_key: TWITTER_CONSUMER_KEY,
	consumer_secret: TWITTER_CONSUMER_SECRET,
	access_token: TWITTER_ACCESS_TOKEN,
	access_token_secret: TWITTER_ACCESS_TOKEN_SECRET
});

function BotStart() {

	var query = {
		q: TWITTER_SEARCH_PHRASE,
		result_type: "recent",
		lang: 'en',
		count: TWITTER_SEARCH_MAX_RESULTS
	}

	console.log("> Twitter bot is running (" + Date() + ")...")

	Bot.get('search/tweets', query, BotQueryResults);

	function BotQueryResults (error, data, response) {
		if (error) {
			console.log('Bot could not find tweets matching the query: ' + error);
		}
		else {

			// DB file
			var bot_db = [];

			// If db file doesn't exist, create empty file
			if (!fs.existsSync(DB_FILE)) {
			    fs.closeSync(fs.openSync(DB_FILE, 'w'));
			}

			fs.readFile(DB_FILE, 'utf8', function (err, fileData) {
				if (!err) {
					fileData = fileData.trim();
					if (fileData != "") {
						bot_db = fileData.split("\n");
					}

					var processed_tweets = [];

					for (var i = 0; i < data.statuses.length; i++) {

						// Tweet id
						var id = data.statuses[i].id_str;

						// User id and handle
						var userId = data.statuses[i].user.id_str;
						var userHandle = data.statuses[i].user.screen_name;

						// If id doesn't exist on database, process it
						if (bot_db.indexOf(id) == -1) {

							processed_tweets.push(id);

							fs.appendFile(DB_FILE, id + "\n", function (err) {
								if (err) {
									console.log("Error on save to '" + DB_FILE + "' file.");
								}
						  	});

							// Like
							Bot.post('favorites/create', {id: id}, function(err, response){
						        if (err) {
						           console.log("> Error: Tweet " + id + " could not be favorited. " + err);
						        }
						    });

							// Reply
							var textToReply = TWEETS_TO_REPLY[Math.floor(Math.random()*TWEETS_TO_REPLY.length)];
							textToReply = "Hey @" + userHandle + ". " + textToReply;
							Bot.post('statuses/update', {status: textToReply, in_reply_to_status_id: id}, function(err, response){
						        if (err) {
						          console.log("> Error: Status could not be updated. " + err);
						        }
						    });

							// Follow
							Bot.post('friendships/create', {user_id: userId, follow: "true"}, function(err, response){
						        if (err) {
						          console.log("> Error: Could not follow user " + userId + ". " + err);
						        }
						    });

						}

					}

					// Log of processed tweets
					if (processed_tweets.length > 0) {
						console.log("> Tweets processed: " + processed_tweets);
					}
					else {
						console.log("> No tweets processed.");
					}

				}
			});

		}

	}

}

// Start bot and timer
BotStart();
setInterval(BotStart, INTERVAL);