gistfile1.rb

require 'uri'
require 'time'
require 'openssl'

require 'rubygems'
require 'typhoeus'
require 'nokogiri'

class JAWS
  include Typhoeus

  class << self
    attr_accessor :aws_access_key_id
    attr_accessor :aws_secret_access_key
  end

  def self.escape(val)
    URI.escape(val, /([^a-zA-Z0-9\-_.~]+)/n)
  end

  def self.sign(http_verb, base_uri, params)
    uri = URI.parse(base_uri)

    path = {
      'AWSAccessKeyId'   => aws_access_key_id,
      'SignatureMethod'  => 'HmacSHA256',
      'SignatureVersion' => '2',
      'Timestamp'        => Time.now.utc.iso8601
    }.merge(params).map do |key, val|
      "#{escape(key)}=#{escape(val)}"
    end.sort.join('&')

    "#{path}&Signature=" + escape(
      [
        ::OpenSSL::HMAC.digest(
          ::OpenSSL::Digest::Digest.new("sha256"),
          aws_secret_access_key,
          "#{http_verb.upcase}\n#{uri.host.downcase}\n#{uri.path}\n#{path}"
        )
      ].pack('m').strip
    )
  end

  def self.send(http_verb, base_uri, params)
    get\
      "#{base_uri}?#{sign(http_verb, base_uri, params)}",
      :on_success => lambda { |r|
        Nokogiri::XML.parse(r.body)
      }
  end

  class SDB
    module Adapter
      module Adapter20090415
        URI = 'https://sdb.amazonaws.com/'
        PARAMS = {'Version' => '2009-04-15'}

        def list_domain(params={}, &block)
          JAWS.send(
            'GET',
            URI,
            PARAMS.merge('Action' => 'ListDomains').merge(params)
          ).xpath('//domainname').each do |val|
            block.call val.content
          end
        end
      end

      extend Adapter20090415
    end

    def self.each(&block)
      Adapter.list_domain(&block)
    end

    def self.[](key)
    end

    class Domain
      attr_reader :name

      def initialize(name)
        @name = name
      end
    end
  end
end