gistfile1.rb

require 'rubygems'
require 'json'
require 'sinatra'

File.open('whois_proxy.pid', 'w') { |f| f.write(Process.pid) }

get '/whois/:tld/:domain' do
  domain = (params['domain'] || '').gsub(/[^a-zA-Z0-9\-\_]/, '')
  tld = (params['tld'] || '').gsub(/[^a-zA-Z0-9\-\_]/, '')
  available = false
  fqdn = "#{domain}.#{tld}"
  if domain != '' and tld != ''
    hostcheck = `host #{fqdn}`
    if hostcheck.include?("does not exist") or hostcheck.include?("not found")
      whois = `whois #{fqdn}`
      available = true if whois.include?("No match") or whois.include?("not found in database") or whois.include?("NOT FOUND")
    end
  end
  {
    "#{params['domain']}.#{params['tld']}" => available
  }.to_json
end