bin/whatever-dl

   1 #!/usr/bin/ruby -w
   2 #
   3 # whatever-dl, a script to download online (web-based) videos.
   4 #
   5 # Copyright Michael Orlitzky
   6 #
   7 # http://michael.orlitzky.com/
   8 #
   9 # This program is free software: you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation, either version 3 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17 # GNU General Public License for more details.
  18 #
  19 # http://www.fsf.org/licensing/licenses/gpl.html
  20 #
  21
  22 # We require the UriUtilities class to handle
  23 # the download of the video URL.
  24 require 'src/uri_utilities'
  25
  26
  27 # All of the website classes are located in one
  28 # directory, so we can 'require' them automatically.
  29 Dir.glob('src/websites/*.rb').each do |r|
  30   require r
  31 end
  32
  33
  34 EXIT_SUCCESS = 0
  35 EXIT_NO_URL = 1
  36 EXIT_INVALID_URL = 2
  37 EXIT_COULDNT_GET_VIDEO_URL = 3
  38 EXIT_OUTPUT_FILE_ALREADY_EXISTS = 4
  39 EXIT_ERROR_READING_FROM_VIDEO_URL = 5
  40 EXIT_CONNECTION_REFUSED = 6
  41 EXIT_HTTP_ERROR = 7
  42 EXIT_ACCESS_DENIED = 8
  43
  44 # Only actually do something if this script was called
  45 # directly (i.e. not from the tests).
  46 if (__FILE__ == $0) then
  47   if (ARGV.length < 1) then
  48     # If the user didn't give us a URL, yell
  49     # at him or her.
  50     puts 'Usage: whatever-dl <url>'
  51     Kernel.exit(EXIT_NO_URL)
  52   end
  53
  54   # Factory method.
  55   site = Website.create(ARGV[0])
  56
  57   if site.nil?
  58     puts 'Invalid URL.'
  59     exit(EXIT_INVALID_URL)
  60   end
  61
  62   video_url = site.get_video_url()
  63
  64   if video_url.nil?
  65     puts 'Error retrieving video URL.'
  66     exit(EXIT_COULDNT_GET_VIDEO_URL)
  67   end
  68
  69   video_uri = URI.parse(video_url)
  70   uu = UriUtilities.new()
  71
  72   if File.exists?(site.get_video_filename())
  73     puts "Error: output file already exists. Please remove #{site.get_video_filename()}, and try again."
  74     Kernel.exit(EXIT_OUTPUT_FILE_ALREADY_EXISTS)
  75   end
  76
  77
  78   # Attempt to download the file, and rescue and report
  79   # any (predictable) exceptions.
  80   begin
  81     puts "Fetching #{video_url}"
  82     puts "Saving as #{site.get_video_filename()}."
  83     puts ""
  84     uu.download_with_progress_bar(video_uri, site.get_video_filename())
  85   rescue Errno::ECONNREFUSED => e
  86     puts 'The connection to the server (to download the video file) was refused. Check your connection, and try again later.'
  87     Kernel.exit(EXIT_CONNECTION_REFUSED)
  88   rescue Errno::EACCES => e
  89     puts "Access denied. Check that you have write permission to the output file/directory. Details: #{e.message}."
  90   rescue OpenURI::HTTPError => e
  91     puts "An HTTP error occurred while downloading the video file: #{e.message}."
  92     Kernel.exit(EXIT_HTTP_ERROR)
  93   end
  94
  95   # Write an empty line at the end for aesthetic reasons.
  96   puts ""
  97
  98   Kernel.exit(EXIT_SUCCESS)
  99 end