Using bit.ly API to shorten URL

bitly.rb

class Bitly

  attr_reader :client

  def initialize(username, password)
    @username, @password = username, password
    @client = RestClient::Resource.new('http://api.bitly.com/v3')
  end

  def shorten(url)
    params = default_params.merge(:longUrl => url)
    JSON::parse(@client['shorten'].post(params))['data']['url']
  end

  private

  def default_params
    {  
      :format => 'json',
      :login => @username,
      :apiKey => @password
    }  
  end

end