tg-username-checker.js

/*
 * Script for checking whether the Telegram username is occupied.
 * Uses t.me (or its mirrors, configurable as a second parameter), so there are no
 * flood limits.
 * Usage:
 * const checkUsername = require('./tg-username-checker')
 * // ...
 * await checkUsername('someone')
 * await checkUsername('someone', 'telesco.pe')
 * Alternatively, can be used as an interactive CLI when ran directly.
 *
 * (c) 2019 teidesu. This script is licensed under GPLv3
 */
const axios = require('axios')

async function check(domain, tme = 't.me') {
    const { data } = await axios.get(`https://${tme}/${domain}`)
    const match = data.match(/<div[^>]* class="tgme_page_extra"[^>]*>(.+?)<\/div>/s)
    if (!match) {
        return false
    }
    const text = match[1].trim()
    return text.indexOf('members') > -1 || text === '@' + domain
}

module.exports = check

// vvv THE FOLLOWING IS NOT NEEDED FOR CHECKING, UI/TEST STUFF ONLY. MAY BE FREELY REMOVED WHEN USED AS A LIBRARY vvv //

const readline = require('readline')

const CRED = '\33[91m'
const CGREEN = '\33[92m'
const CEND = '\33[0m'
const CYELLOW = '\33[33m'

function prompt(text) {
    return new Promise(resolve => {
        const rl = readline.createInterface({
            input: process.stdin,
            output: process.stdout
        })
        rl.question(text, (val) => {
            rl.close()
            resolve(val)
        })
    })
}



async function test() {
	proms = []
    // tggdesu, desubot, ksaxbot, tggblog should return true, others -- false.
	for (let i of ['tggdesu', 'desubot', 'ksaxbot', 'tggblog', 'djsdhasjkdhsak', 'fjhdhfdjhfdjbot', 'foo', 's']) {
    	proms.push(check(i).then(res => console.log(i, res)))
    }
    return Promise.all(proms)
}

async function main() {
    for (;;) {
        const d = await prompt(CYELLOW + 'Domain > ' + CEND)
        if (d === 'q') {
            break
        }
        process.stdout.write(CYELLOW + 'Checking...' + CEND + '\r')
        const res = await check(d)
        console.log((!res ? CGREEN + 'Available!' : CRED + 'Occupied!') + CEND + '   ')
    }
}

if (require.main === module) {
    main().catch(console.error)
}