Amazon Web Service

Amazon Web Service に ISBN で問い合わせしてみる。

登録IDの取得
http://www.amazon.co.jp/gp/feature.html?docId=451209

オンラインドキュメントトップページ
http://www.amazon.com/gp/browse.html/?node=3487571

オンラインドキュメントトップページから迷子になった後にやっとたどり着いたページ
http://docs.amazonwebservices.com/AWSEcommerceService/2007-02-22/

問い合わせ先：ecs.amazonaws.jp
目的のXML ：
Medium Response Group
http://docs.amazonwebservices.com/AWSEcommerceService/2007-02-22/ApiReference/MediumResponseGroup.html

獲得したい情報：

URL
表紙URL
著者名
ISBN
出版社名
出版日付
タイトル
価格

# isbn_lookup.rb
=begin
The Base URL
# http://docs.amazonwebservices.com/AWSEcommerceService/2007-02-22/PgRestRequestsArticle.html
# For Amazon.co.jp (JP) => http://ecs.amazonaws.jp/onca/xml?Service=AWSECommerceService

ItemSearch Operation
# http://docs.amazonwebservices.com/AWSEcommerceService/2007-02-22/ApiReference/ItemSearchOperation.html

Medium Response Group
# http://docs.amazonwebservices.com/AWSEcommerceService/2007-02-22/ApiReference/MediumResponseGroup.html>

The Request that Generated the Response (REST)

http://ecs.amazonaws.com/onca/xml?Service=AWSECommerceService
# http://ecs.amazonaws.jp/onca/xml?Service=AWSECommerceService
    &AWSAccessKeyId=[Your Access Key ID Here]
    &AssociateTag=[Your Associate ID Here]
    &Operation=ItemLookup
    &ItemId=B00008OE6I
    &ResponseGroup=Medium
=end

require 'uri'
require 'net/http'
require "rexml/document"

module Amazon

  class ISBN_Lookup

    def initialize(aws_accessKeyId, associate_ID)
      @aws_key = aws_accessKeyId
      @aws_id = associate_ID
      @jp_ecs = 'http://ecs.amazonaws.jp'
    end

    def seturi(isbn)
      uri = URI.parse(@jp_ecs)
      uri.path='/onca/xml'
      q = [
        "Service=AWSECommerceService",
        "AWSAccessKeyId=#{@aws_key}",
        "Operation=ItemLookup",
        "ItemId=#{isbn}",
        "AssociateTag=#{@aws_id}",
        "ResponseGroup=Medium"
      ]
      uri.query = q.join("&")
      return uri
    end
  end

  class Access

    def initialize(uri)
      @host = uri.host
      @request = uri.request_uri
    end

    def error_message
      print "SocketError\n"
    end

    def reponse
      begin
        Net::HTTP.start(@host) { |http|
          response = http.get(@request)
          return response.body
        }
      rescue SocketError, error_message
      end
    end
  end

  class Book < Struct.new(:detailpageurl, :mediumimage_url, :author, :isbn, :publisher, :publicationdate, :title, :amount)

    def initialize(res)
      @doc = REXML::Document.new(res) unless res.nil?
      @itemAttributes = @doc.root.elements['Items/Item/ItemAttributes'] unless res.nil?
    end

    def setup
      return nil if @doc.nil?
      return nil if @itemAttributes.nil?
      @itemAttributes.to_a.each{|x| 
        xx = x.name.downcase
        self[:amount] = x.text('Amount') if xx.to_s == "listprice"
        unless members.index(xx.to_s).nil?
          sym = xx.to_sym  #symbol
          self[sym] = x.text
        end
      }
      self.detailpageurl = urldegital
      self.mediumimage_url = urlimg
      return self
    end

    def get(xpath)
      @doc.root.elements[xpath].text unless @doc.root.elements[xpath].nil?
    end

    def urldegital
      get('Items/Item/DetailPageURL')
    end

    def urlimg
      get('Items/Item/MediumImage/URL')
    end

  end

end

#+++++++++++++++++++++++++
#example;

# ISBN :4063406482
aws_key　= xxxxxxx 
aws_id = xxxxxxx

isbn = '4063406482'
uri = Amazon::ISBN_Lookup.new(aws_key, aws_id).seturi(isbn)
res = Amazon::Access.new(uri).reponse
book = Amazon::Book.new(res)
p book.setup
#exit
puts book.mediumimage_url
#=> http://ec1.images-amazon.com/images/I/21po5oj5XOL.jpg
puts book.author
#=> 二ノ宮 知子
puts book.isbn
#=> 4063406482
puts book.publisher
#=> 講談社
puts book.publicationdate
#=> 2007-06-13
puts book.title
#=> のだめカンタービレ #18 (18)
puts book.amount
#=> 410

これをもとにエントリーに書籍リンクをはるとこまでが目的。。。

--imported_from
http://www.midore.net/daybook/2007/06/1180989126.html