Get Podcast Feed from iTunes URL

podcasts.rb

require 'httparty'
require 'nokogiri'

def get_id url
  #extract the id from the url
  url.scan(/id(\d+)/).first.first
end

def get_page url
  #download the html content of the podcast page using itunes user-agent
  HTTParty.post(url, headers: {
    'User-Agent' => 'iTunes/10.3.1 (Macintosh; Intel Mac OS X 10.6.8) AppleWebKit/533.21.1'
  })
end

def get_feed html
  #extract the feed-url attribute from the first button element containing one
  Nokogiri::HTML(html).css('button').find{ |b| not b['feed-url'].nil? }['feed-url']
end

def get_feed_from_itunes url
  #convert a itunes podcast url into a feed url
  get_feed(get_page "https://itunes.apple.com/WebObjects/DZR.woa/wa/viewPodcast?id=#{get_id url}")
end


test = 'https://itunes.apple.com/us/podcast/99-invisible/id394775318?mt=2'
puts get_feed_from_itunes u