downtrotter.rb

require 'rubygems'
require 'nokogiri'
require 'open-uri'
require 'net/http'

def OpenURI.redirectable?(uri1, uri2)
  uri1.scheme.downcase == uri2.scheme.downcase || (/\A(?:http|ftp|https)\z/i =~ uri1.scheme && /\A(?:https?|ftp)\z/i =~ uri2.scheme)
end

module Daytrotter
  ROOT_DIR      = File.expand_path(File.dirname(__FILE__))
  ROOT_URL      = "http://www.daytrotter.com"
  ALPHABETICAL  = "#{ROOT_URL}/al/artists/alphabetical.html"
  CHRONOLOGICAL = "#{ROOT_URL}/al/artists/chronological.html"
  
  class Session
    attr_accessor :url, :artist, :date, :doc
    
    def initialize(url,artist,date)
      @artist = artist
      @url    = "#{ROOT_URL}#{url}"
      @date   = date
    end
    
    def free_download_url
      @doc = Nokogiri::HTML(open(@url))
      link = @doc.search('a b.free').first().parent().attribute('href')
      if(link != nil)
        return URI.encode("#{ROOT_URL}#{link}")
      else
        return nil
      end
    end
    
    def download_for_free
      url = self.free_download_url
      unless url.nil?
        @doc = Nokogiri::HTML(open url)
        Net::HTTP.start('daytrotter.com') { |http|
          resp = http.get('/launch-download-manager.jnlp',{
            'accept'  => '*/*',
            'referer' => url,
            'host'    => 'daytrotter.com'
          })
          open("#{ROOT_DIR}/#{@artist}.jnlp", 'wb') { |file|
            file.write(resp.body)
          }
          # `open #{filename}`
        }
      end
      # if url != nil
      #   @doc = Nokogiri::HTML(open url)
      #   Net::HTTP.start('daytrotter.com') { |http|
      #     resp = http.get('/launch-download-manager.jnlp')
      #     open("launch-download-manager.jnlp", "wb") { |file|
      #       file.write(resp.body)
      #     }
      #     `open #{ROOT_DIR}/launch-download-manager.jnlp`
      #   }
      # end
    end
  end
  
  class Sessions    
    def self.chronological
      @doc = Nokogiri::HTML(open(CHRONOLOGICAL))
      @sessions = [];
      @doc.css('#SessionArchives > ol li[class!=clear]').each do |session|
        url    = session.search('a').first().attribute('href')
        artist = session.search('b').text()
        date   = session.search('i').text()
        @sessions << Session.new(url,artist,date)
      end
      return @sessions
    end
  end
end

Daytrotter::Sessions.chronological[0..1].each do |session|
  puts "Downloading #{session.artist} - published #{session.date}"
  session.download_for_free
end