urlbox.rb

require 'cgi'
require 'openssl'
require 'open-uri'
 
def urlbox(url, options={})
  urlbox_apikey = 'xxx-xxx'
  urlbox_secret = 'xxx-xxx'
 
  query = {
    :url       => url,
    :force     => options[:force],
    :full_page  => options[:full_page],
    :thumb_width => options[:thumb_width],
    :width  => options[:width],
    :height  => options[:height],
  }
 
  query_string = query.
    sort_by {|s| s[0].to_s }. 
    select {|s| s[1] }.       
    map {|s| s.map {|v| CGI::escape(v.to_s) }.join('=') }.
    join('&')
 
  # puts query_string
 
  puts URI::encode(query_string)
  
  token = OpenSSL::HMAC.hexdigest('sha1', urlbox_secret, query_string)
 
  "http://api.urlbox.io/v1/#{urlbox_apikey}/#{token}/png/?#{query_string}"
end
 
puts urlbox "www.google.com"