Rubyでニコ動のタイトルやサムネ画像URLを取得したりとか

gistfile1.rb

#!/usr/bin/env ruby
# vim: fileencoding=utf-8
require 'open-uri'

module NicoVideo
  GETTHUMBINFO_URL = "http://ext.nicovideo.jp/api/getthumbinfo"
  OK_STRING = %q|<nicovideo_thumb_response status="ok">|
  FAIL_STRING = %q|<nicovideo_thumb_response status="fail">|
  ELEMENTS = [:title,
              :description,
              :thumbnail_url,
              :watch_url]
  THUMBINFO = Struct.new(*ELEMENTS)

  def getthumbinfo(video_id)
    doc = open("#{GETTHUMBINFO_URL}/#{video_id}"){|f|f.read}
    if /#{OK_STRING}/ =~ doc
      ELEMENTS.inject(THUMBINFO.new) do |result, element|
        result[element] = doc.slice(%r|<#{element}>(.+?)</#{element}>|, 1)
        result
      end
# Ruby1.9系なら下記のコード
#      ELEMENTS.each_with_object(THUMBINFO.new) do |element, obj|
#        obj[element] = doc.slice(%r|<#{element}>(.+?)</#{element}>|, 1)
#      end
    else
      false
    end
  end
  module_function :getthumbinfo
end

if $0 == __FILE__
  sm9 = NicoVideo.getthumbinfo(:sm9)
  puts sm9.title                 #=> 新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師
  puts sm9.description           #=> レッツゴー！陰陽師（フルコーラスバージョン）
  puts sm9.thumbnail_url         #=> http://tn-skr2.smilevideo.jp/smile?i=9
  puts sm9.watch_url             #=> http://www.nicovideo.jp/watch/sm9

  p NicoVideo.getthumbinfo(:smX) #=> false
end