Rubyで、さまざまなサービスの短縮URLを展開する

short_url.rb

#!ruby -Ku

require 'net/http'
require 'uri'
require 'json'
require 'pp'

class ShortURL
  # 普通のURLを渡した場合、そのまま返す
  def self.expand(short_url)
    # http://longurl.org/api
    connection = Net::HTTP.new('api.longurl.org')
    connection.start do |http|
      headers = {
        'Referer' => '',
        'User-Agent' => ''
      }

      path = "/v2/expand?url=#{URI.encode(short_url)}&format=json"
      response = http.request_get(path, headers)

      data = JSON.parse(response.body)

      if data['messages']
        raise data['messages'][0]['message']
      end

      data['long-url']
    end
  end
end

__END__

# test
pp ShortURL.expand('http://is.gd/w')
pp ShortURL.expand('http://www.google.co.jp')
pp ShortURL.expand('zxsdzsdfzdf')