Taobao API parameters handler module.

gistfile1.rb

# encoding: utf-8

# include Taobao::Parameters module, then call #params=() instance method to set more parameters ( method_name, etc.) and call 
# #params_after_sign to get the full url query parameters after signing.

require 'digest/md5'

module Taobao
  module Parameters
    def self.included(base)
      base.class_eval do
        attr_writer :timestamp
        attr_accessor :method_name
        attr_writer :params
      end 
      base.extend ClassMethods 
      base.send :include, InstanceMethods
    end 

    module InstanceMethods
      def default_params
        {   
          :method       => method_name,
          :session      => nil,
          :timestamp    => timestamp,
          :format       => format,
          :app_key      => self.class.app_key,
          :v            => 2.0,
          :sign_method  => :md5,
          :pid          => self.class.pid
        }   
      end 

      def params
        @params ||= {}
      end 

      def params_before_sign
        parameters = default_params.merge(params)
        parameters.delete_if {|name, value| value.nil?}         
        parameters 
      end 

      def params_after_sign
        params_before_sign.merge(:sign => self.class.sign(params_before_sign))
      end 

      def format
        :json
      end 

      def timestamp
        if @timestamp && @timestamp.is_a?(String)
          @timestamp
        else
          (@timestamp ||= Time.now).strftime("%Y-%m-%d %H:%M:%S")
        end 
      end 
    end 
    module ClassMethods
      def app_secret
        "" # TODO taobao api secret
      end

      def app_key
        "" # TODO taobao api key
      end

      def pid
        "" # TODO PID
      end

      def sign(options = {})
        str = options.keys.sort.map do |name|
          "#{name}#{options[name]}"
        end.join

        str = [app_secret, str, app_secret].join

        Digest::MD5.hexdigest(str).upcase
      end
    end
  end
end