[Ruby]amazon-ecs を使った商品情報取得サンプル。ResponseGoup は ItemAttributes, SalesRank, OfferSummary を指定。

paapi-sample.rb

# encoding: utf-8
 
require 'amazon/ecs'
require 'yaml'
require 'nokogiri' 

class PaapiSample
  def initialize
    @config = YAML.load_file('./paapi-sample.yaml')

    Amazon::Ecs.options = {
      :associate_tag => @config['associate_tag'],
      :AWS_access_key_id => @config['AWS_access_key_id'],
      :AWS_secret_key => @config['AWS_secret_key']
    }
  end

  def get asin
    info = Hash::new
    res = Amazon::Ecs.item_lookup(asin, :response_group => "ItemAttributes, SalesRank, OfferSummary", :country => 'jp')
    res.items.each do |item|
      element = item.get_element('ItemAttributes');
      info[:asin] = asin
      info[:title] = element.get('Title')
      info[:amount] = element.get('ListPrice/Amount')
      info[:public_date] = element.get('PublicationDate')
      info[:url] = "http://www.amazon.co.jp/dp/#{asin}?tag=#{@config['associate_tag']}"

      element = item.get_element('SalesRank');
      Nokogiri::XML(element.to_s).xpath('/').each do |node|
        info[:sales_rank] = node.text
      end
      
      element = item.get_element('OfferSummary');
      info[:used_price] = element.get('LowestUsedPrice/Amount')
      info[:num_of_new] = element.get('TotalNew')
      info[:num_of_used] = element.get('TotalUsed')
    end
    return info 
  end 
      
end   
    
if __FILE__ == $0
  obj = PaapiSample.new
  asin = "4894712288"
  asin = ARGV[0] unless ARGV[0] == nil
  info = obj.get(asin)
  puts info
  puts info[:title]
  puts info[:url]
  puts info[:sales_rank]
  puts info[:amount]
  puts info[:num_of_new]
  puts info[:used_price]
  puts info[:num_of_used]
end

paapi-sample.yaml

associate_tag: XXX
AWS_access_key_id: YYY
AWS_secret_key: ZZZ