Download Songs

song-download.rb

=begin
The MIT License (MIT)

Copyright (c) 2015 Sandip Ransing

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
=end

require 'open-uri'

BASE_URL = "http://www.thesufi.com/sufimusic/nusrat-fateh-ali-khan.html"
DOWNLOAD_DIR = "nusrat fateh ali khan"
MATCH_CRITERIA = 'http://www.thesufi.com/sufimusic/nusrat-fateh-ali-khan/'
EXTENSIONS = ['.mp3', '.mp4', '.wav']

URL_Regex = /http:\/\/[^" ;]+\b/
Dir.mkdir(DOWNLOAD_DIR) unless File.exists? DOWNLOAD_DIR

main_html = open(BASE_URL).read rescue 'Invalid URL'
main_html.scan(URL_Regex).each do |url|
  next unless url.match MATCH_CRITERIA
  html = open(url).read rescue next
  html.scan(URL_Regex).each do |url|
    next unless url.end_with? *EXTENSIONS
    dir, name = url.split(/\//)[-2..-1]
    dir = [DOWNLOAD_DIR, dir].join('/')
    Dir.mkdir(dir) unless File.exists? dir
    filepath = [dir, name].join('/')
    next if File.exists? filepath
    open(filepath, "wb") do |file|
      file.write(open(url).read)
    end
    puts "downloaded: #{name}"
  end
end