Re: YouTube and other streaming media (caching)

["Horacio H." <pokehorace@xxxxxxxxx>]

Hi everybody,

regarding this issue:

http://wiki.squid-cache.org/WikiSandBox/Discussion/YoutubeCaching

I came up with a workaroud, it's a rewriter script in PHP (sorry I'm
not good at Perl, but maybe someone would be kind enough to later
share a transcoded version... jeje)

NOTE 1: Use this script for testing purposes only, It may not work as
expected... I've tested it only with very few URLs... If you can
improve it, please share.

NOTE 2: To use this script you need the PHP command line interface. In
Ubuntu yo can install it with this command:

sudo apt-get install php5-cli

NOTE 3: Make sure the log file is writable by the script.

And now the script:

#!/usr/bin/php -q
<?php
#
# 2008-11-03 : v1.3 : Horacio H.
#

 ## Open log file ##

 $log = fopen('/var/squid/logs/rewriter.log','a+');

 ## Main loop ##

 while ( $X = fgets(STDIN) ) {

   $X = trim($X);

   $lin = split(' ', $X);

   $url = $lin[0];

   ## This section is for rewriting store-URL of YT & GG videos ##

   if ( preg_match('@^http://[^/]+/(get_video|videodownload|videoplayback)\?@',$url)
) {

     ## Get reply headers ##

     $rep = get_headers($url);

     ## If reply is a redirect, make its store-URL unique to avoid
matching the store-URL of a video ##

     $rnd = "";

     if ( preg_match('/ 30[123] /',$rep[0]) ) {

       $rnd = "&REDIR=" . rand(10000,99999);

     }

     $url = preg_replace('@.*id=([^&]*)&?.*$@',"http://videos.SQUIDINTERNAL/ID=$1$rnd",$url);

   }

   ## Return rewrited URL ##

   print $url . "\n";

   ## Record what we did on log ##

   fwrite($log,"$url $rep[0]\n");

   ## May do some good, but I'm not sure ##

   flush();

 }

 fclose($log);

?>
## END OF SCRIPT ##

The trick here is knowing if the URL is a redirect (301, 302 or 303)
with the get_headers function.  It would be nice if the Squid process
passed the HTTP status to the script, maybe as a key=value pair, but
I'm not even a programmer so that is way beyond my knowledge...

Regards,

Horacio H.