Find valid .google domains

google.js

// I ran this with:
// while true; do node ~/Desktop/google.js --max_old_space_size=4096 --optimize_for_size --max_executable_size=4096 --stack_size=4096 && break; done
// This will run the script with 4GB allocated memory, and auto-restart if it crashes (happens sometimes due to out of memory).

const https = require('https');
const fs = require('fs');

// File storage between runs.
const validStorage = '/Users/ruben/Desktop/validURLs.txt';
const attemptsStorage = '/Users/ruben/Desktop/attempts.txt';

let attempts = [];
const alphabet = ['a', 'b', 'c', 'd', 'e', 'g', 'f', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];

// Loads previous attempts from file system.
function loadHistory() {
  return new Promise((resolve, reject) => {
    // Read attempts file.
    fs.readFile(attemptsStorage, 'utf8', (err, content) => {
      if(err) {
        reject();
      }

      // Load file into attempts array in memory.
      attempts = content.split('\n');
      resolve();
    });
  });
}
// Generates a unique URL not seen in attempts array.
function generateURL() {
  return new Promise((resolve, reject) => {
    let name = '';
    let foundUnique = false;
    do {
      // Generate a name
      name = '';
      for(var i = 0; i < Math.ceil(Math.random() * 10); i++) {
        const letter = alphabet[(Math.floor(Math.random() * alphabet.length))];
        name += letter;
      }

      // Make sure we haven't seen this name yet.
      foundUnique = !attempts.includes(name);
    } while(!foundUnique)

    // Store this attempt in memory.
    fs.appendFile(attemptsStorage, name+"\n", 'utf8', (err) => {
      if(err) {
        console.log(err);
        reject(err);
      }
      
      // Return the name.
      resolve('https://' + name + '.google/');
    });
  });
}
// Recursive loop, makes attempts to .google URLs and stores if valid.
function beginAttempts() {
  // Randomly generate a unique URL.
  generateURL().then((url) => {
    // Make GET request.
    const req = https.get(url, (res) => {
      // Output and store valid requests.
      if(res.statusCode == '301' || res.statusCode == '200') {
        console.log('VALID URL', url, res.statusCode);
        fs.appendFile(validStorage, url+"\n", 'utf8'); 
      }

      // Try again.
      beginAttempts();
    });
    
    // If the request failed (likely ENOTFOUND), try again.
    req.on('error', (err) => {
      console.log(err.code + ": " + err.hostname);
      // Try again.
      beginAttempts();
    });
  });
}

// Starts program.
loadHistory().then(beginAttempts);