The following PHP script does the job of tracking your downloads – like who (IP) downloaded what. It does the following operations
- accept the file download request in a particular format – for ex : www.xyz.com/download.php?src=filename.ext
- verifies the presence of the file
- serves the file for download
- log the details – client’s IP and the file downloaded – into a file
<?php
//set 404 page Not Found page
$errorpage=”Location: http://www.mysite.com/404.htm”;
//name of the file to be downloaded
$filename=$_GET["src"];
//checking for file name being empty
if (empty($filename))
{
header($errorpage); //404 page
exit();
}
//checking for file existance
if (!file_exists($filename))
{
header($errorpage); //404 page
exit();
}
//prep the requested file for download
//send header
$mtype=”application/force-download”;
$mtype=$_FILES[$filename]['type'];
$fsize=filesize($filename);
header(“Pragma: public”);
header(“Expires: 0″);
header(“Cache-Control: must-revalidate, post-check=0, pre-check=0″);
header(“Cache-Control: public”);
header(“Content-Description: File Transfer”);
header(“Content-Type: $mtype”);
header(“Content-Disposition: attachment; filename=\”$filename\”");
header(“Content-Transfer-Encoding: binary”);
header(“Content-Length: ” . $fsize);
//start sending out the file contents
$fileptr=@fopen($filename,”rb”);
if ($fileptr) {
while (!feof($fileptr)) {
print(fread($fileptr,1024*8));
flush();
if (connection_status()!=0) {
@fclose($fileptr);
die();
}
}
@fclose($fileptr);
}
else {
header($errorpage); //404page
die();
}
//LOGGING successful download in to a file
//file is opened in append mode
$handle=fopen(“download.log”,”a+”);
//IP from which the request is issued is available from $_SERVER macro
$remoteipaddress=$_SERVER["REMOTE_ADDR"];
//values are written in to the file for future reference
if ($handle != FALSE) {
//log who downloaded what
fwrite ($handle, $remoteipaddress.” – “.$filename.”\n”);
fflush ($handle);
}
fclose($handle);
?>
The data available from this can be used in a number of ways – like understanding the download pattern over a period of time, demand from around the world, …
note :
You can use the following code snippet to serve the file [source]
Use this after the comment “//start sending out the file contents” line :
ob_clean();
flush();
readfile($file);
