国会図書館検索API利用サンプル

ndl_search_sample.rb

require "faraday"
require 'nokogiri'

class NdlSearch

  def get_book_info(title, creator = nil)
    data = []
    query = {
      :mediatype => 1,
      :cnt => 10
    }
    query[:title] = title
    query[:creator] = creator if creator
    response = ndl_get('/api/opensearch', query)
    xml = Nokogiri::XML(response.body)
    xml.remove_namespaces!
    items = xml.xpath('/rss/channel/item')
    items.each do |item|
      #puts "-------"
      #puts item
      book = {}
      item.children.each do |c|
        key = c.name
        next if key == 'text'
        val = "#{c.content}"
        label = c.attribute("type")
        if label
          label = "#{label}".gsub(/^dcndl:|^dcterms:/,'')
          book[label] ||= []
          book[label] << val unless book[label].include?(val)
          val = "#{label}:#{val}"
        end
        book[key] ||= []
        book[key] << val unless book[key].include?(val)
      end
      book = book.map {|key,val| [key, val.join(',')]}.to_h
      data << book
    end
    data
  end

  private

  def ndl_get(path, pram)
    con = Faraday.new(:url => 'http://iss.ndl.go.jp') do |f|
      f.request  :url_encoded
      f.response :logger
      f.adapter  Faraday.default_adapter
    end
    con.get path, pram
  end
end

ndl_search = NdlSearch.new
res =  ndl_search.get_book_info('オリジン','ダンブラウン')
res.each do |book|
  puts '-----------'
  book.each do |key, val|
    puts "#{key}:#{val}"
  end
end