From 3a8aa504b7ab41a3d64903335f3b0bc5e57e212b Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Thu, 1 Apr 2010 18:53:27 -0400
Subject: [PATCH] Update the Redtube class. It is no longer necessary to
 perform magic rituals prior to calculating the video URL.

---
 src/websites/redtube.rb | 134 +++-------------------------------------
 1 file changed, 9 insertions(+), 125 deletions(-)

diff --git a/src/websites/redtube.rb b/src/websites/redtube.rb
index 3b1a4fa..f65e8ad 100644
--- a/src/websites/redtube.rb
+++ b/src/websites/redtube.rb
@@ -14,25 +14,11 @@
 # GNU General Public License for more details.
 #
 # http://www.fsf.org/licensing/licenses/gpl.html
-#
-# 
-# NOTE:
-#
-# All credit belongs to whomever reverse-engineered the Redtube
-# Flash applet in the first place. I took the algorithm from this
-# script:
-#
-# http://userscripts.org/scripts/review/8691
-#
-# and merely cleaned it up a bit while porting it to Ruby.
-#
 
-# The Redtube class needs the extra string methods..
-require 'src/string'
 require 'src/website'
+require 'cgi'
+
 
-# This class handles the algorithm magic needed to get
-# the URL from a Redtube video id.
 class Redtube < Website
 
   VALID_REDTUBE_URL_REGEX = /^(http:\/\/)?(www\.)?redtube\.com\/(\d+)$/
@@ -42,132 +28,30 @@ class Redtube < Website
   end
 
 
-  # The only public method. This calls the other parts
-  # of the algorithm and, with any luck, we wind up with
-  # the URL to the video.
   def get_video_url()
-    # First, parse the video ID out of the URL.
-    video_id = parse_video_id()
-    
-    padded_id = video_id.to_s.pad_left('0', 7)
-
-    video_dir = self.get_video_dir(video_id)
-    file_name = self.get_file_name(padded_id)
-
     page_data = self.get_page_data(@url)
-
-    # As far as I know, the MP4s don't work yet.
-    # So just default to the FLV.
-    top_secret_hash = parse_hash_flv(page_data)
-
-    return 'http://dl.redtube.com/' +
-           self.get_root_server_dir() +
-           "/#{video_dir}/#{file_name}" +
-           top_secret_hash
-  end
-
-
-  def get_video_filename()
-    # Mildly redundant.
-    video_id = parse_video_id()
-    padded_id = video_id.to_s.pad_left('0', 7)
-
-    return self.get_file_name(padded_id)
+    return self.parse_hashlink(page_data)
   end
 
 
   protected;
 
-  VIDEO_FILE_EXTENSION = '.flv'
-
   def parse_video_id()
     return /\d+/.match(@url)[0]
   end
 
 
+  def parse_hashlink(page_data)
+    hashlink_regex = /hashlink=([^"]+)"/
 
-  def parse_hash_flv(page_data)
-    # Hashes are generated for both flv/mp4 and are delivered
-    # along with the video page. We need to stick them back on
-    # the end of the final video URL, or else it doesn't work.
-    hash_flv_regex = /&hash_flv=(\/.*?)&/
-
-    matches = hash_flv_regex.match(page_data)
+    matches = hashlink_regex.match(page_data)
 
     if matches.nil?
-      raise StandardError.new("Couldn't parse the hash_flv variable.")
+      raise StandardError.new("Could not parse the 'hashlink' Flash variable.")
     end
 
-    return matches[1]
-  end
-
-
-  def get_root_server_dir()
-    # They hard code this shit into the SWF file.
-    return '467f9bca32b1989277b48582944f325afa3374'
+    # The hashlink variable /is/ the video URL, but it's encoded.
+    return CGI::unescape(matches[1])
   end
   
-  # Not sure what they're thinking with this one.
-  def get_video_dir(video_id)
-    return (video_id.to_f / 1000.0).floor.to_s.pad_left('0', 7)
-  end
-
-
-  # The first part of the algorithmic magic. Multiply each 
-  # digit of the padded video id by the index of the
-  # following digit, and sum them up.
-  def int_magic(padded_video_id)
-    ret = 0
-
-    0.upto(6) do |a|
-      ret += padded_video_id[a,1].to_i * (a+1)
-    end
-  
-    return ret
-  end
-
-
-  # Part 2 of the magic. Sum the digits of the result
-  # of the first magic.
-  def more_magic(file_string)
-    magic = self.int_magic(file_string).to_s
-    
-    ret = 0
-    
-    0.upto(magic.length - 1) do |a|
-      ret += magic[a,1].to_i
-    end
-
-    return ret
-  end
-
-
-  # Complete fricking mystery
-  def get_file_name(file_string)
-    map = ['R', '1', '5', '3', '4', '2', 'O', '7', 'K', '9', 'H', 'B', 'C', 'D', 'X', 'F', 'G', 'A', 'I', 'J', '8', 'L', 'M', 'Z', '6', 'P', 'Q', '0', 'S', 'T', 'U', 'V', 'W', 'E', 'Y', 'N']
-
-    # The stupid variable names I copied from the
-    # source script. Considering myself disclaimed.
-    my_int = self.more_magic(file_string)
-    new_char = '0' + my_int.to_s
-    
-    if my_int >= 10 then
-      new_char = my_int.to_s
-    end
-    
-    file_name =  map[file_string[3] - 48 + my_int + 3]
-    file_name += new_char[1,1]
-    file_name += map[file_string[0] - 48 + my_int + 2]
-    file_name += map[file_string[2] - 48 + my_int + 1]
-    file_name += map[file_string[5] - 48 + my_int + 6]
-    file_name += map[file_string[1] - 48 + my_int + 5]
-    file_name += new_char[0,1]
-    file_name += map[file_string[4] - 48 + my_int + 7]
-    file_name += map[file_string[6] - 48 + my_int + 4]
-    file_name += VIDEO_FILE_EXTENSION
-    
-    return file_name
-  end 
-
-  
 end
-- 
2.43.2