small ruby server to show a random tinygrab image

grabby.rb

require 'sinatra'
require 'open-uri'

get '/' do
  tryImg
end

def tryImg

  rand = ''
  1.upto(4) { rand << rand(36).to_s(36) }

  open('http://grab.by/%s' % rand) do |c|

    if c.content_type == 'image/png'
      content_type c.content_type
      c.read

    else
      tryImg

    end

  end

end