cloudflare_email_scrape.js

#!/usr/bin/env node

'use strict';

/**
 * Usage:
 * `require('./cloudflare_email_scrape')('d1bcb491b6a4a2ffb9bea2a5')`
 * `curl -s https://gus.host | ./cloudflare_email_scrape.js`
 * `./cloudflare_email_scrape d1bcb491b6a4a2ffb9bea2a5 ...`
 */

function parseHash(hash) {
  const mask = parseInt(hash.substr(0, 2), 16);
  let final = '';
  for (let i = 2; i < hash.length && hash.charAt(i) !== 'X'; i += 2) {
    final += String.fromCharCode(parseInt(hash.substr(i, 2), 16) ^ mask);
  }
  return final;
}

const RE = /data-cfemail="(.+?)"/g;

if (require.main === module) {
  if (process.argv.length > 2) {
    process.stdout.write(JSON.stringify(process.argv.slice(2).map((h) => parseHash(h))));
  } else {
    let body = '';
    process.stdin.on('readable', () => {
      const chunk = process.stdin.read();
      if (chunk !== null) {
        body += chunk;
      }
    });
    process.stdin.on('end', () => {
      const emails = [];
      let match;
      while (true) {
        match = RE.exec(body);
        if (!match) {
          break;
        }
        emails.push(parseHash(match[1]));
      }
      process.stdout.write(JSON.stringify(emails, null, 2));
    });
  }
}

module.exports = parseHash;