javascript - Php copy CPU consumption -

i creating site allows users view file via javascript plugin.

to this, , maintain security of file, creating 1 time unique copy of original file, each time javascript plugin accessed.

the original file @ maximum 30mb, how scale multiple users of system? if 100 people create , access copy of file.

you can creating htaccess rewrite refer user php script:

rewriteengine on rewriterule ^download/([^/]+) /lib/download.php?file=$1 [qsa] 

this forward request yourdomain.com/download/anyfilehere.mp3?one_time_token=abcdefg lib/download.php , set $_get['file'] anyfilehere.mp3. one_time_token $_get parameter forwarded, used [qsa].

the download.php this:

<?php     if (!empty($_get['file'])) {         if (!empty($_get['one_time_token'])) {             if (tokenok($_get['one_time_token'])) { //create function called tokenok download token in eg. database                 $filename = '/var/www/downloadfolder/' . $_get['file'];                 if (file_exists($filename)) {                     expiretoken($_get['one_time_token']); //create function called expiretoken expire token in eg. database                     readfile($filename); //read file user                     die();                 } else {                     die('error: file not found');                 }             } else {                 die('error: token not ok');             }         } else {             die('error: token not specified');         }     } else {         die('error: file not specified');     } ?> 

things consider:

• output mime header type specifying content-type of file
• read this php manual entry on readfile
• limit 1 time token valid in time frame (and notify user of this), instead of allowing downloaded once
• how system react if user cancels download, , therefore can't download again?
• what if download fails? need request new download link?
• if it's streaming mp3 file, make sure seeking works (it won't if seek outside mp3 has streamed to, it'll create new request mp3 file)