I'm using forced download to download mostly zips and mp3s on site i did (http://pr1pad.kissyour.net) - to track downloads in google analytics, in database and to hide real download path:
It's this:
extending CI model
... - bunch of code
function _fullread ($sd, $len) {
$ret = '';
$read = 0;
while ($read < $len && ($buf = fread($sd, $len - $read))) {
$read += strlen($buf);
$ret .= $buf;
}
return $ret;
}
function download(){
/* DOWNLOAD ITSELF */
ini_set('memory_limit', '160M');
apache_setenv('no-gzip', '1');
ob_end_flush();
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public",FALSE);
header("Content-Description: File Transfer");
header("Content-type: application/octet-stream");
if (isset($_SERVER['HTTP_USER_AGENT']) &&
(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false))
header('Content-Type: application/force-download'); //IE HEADER
header("Accept-Ranges: bytes");
header("Content-Disposition: attachment; filename=\"" . basename("dir-with- files/".$filename) . "\";");
header("Content-Transfer-Encoding: binary");
header("Content-Length: " . filesize("dir-with-files/".$filename));
// Send file for download
if ($stream = fopen("dir-with-files/$filename", 'rb')){
while(!feof($stream) && connection_status() == 0){
//reset time limit for big files
set_time_limit(0);
print($this->_fullread($stream,1024*16));
flush();
}
fclose($stream);
}
}
It's on LAMP with CI 1.7.2 - It's my own method put together from various how-tos all over the internet, because during developement, these problems came up:
- server limit. ini_set
haven't helped, so I used buffered _fullread
instead normal fread
, which was used insted of @readonly
- ob_end_flush(), because site is did in CI1.7.2 and i needed to clean buffer
Now... It doesn't work. It did, then it stopped showing expected size/download time - I tried to clean it up and while I was cleaning up the code, something happened, I don't know what and in any previous version - it haven't worked (no change in settings whatsoever) - edit: don't work = outputs everything into browser window.
So I said, screw it, I'll look here.
So, I basically look for script or function, which i can put to my output model and will do:
Thank you in advance.
Edit: Now I feel more screwed then ever/before, since I tried to force download with .htaccess - while it worked, it had few minor/major (pick yours) problems
Now, although I deleted .htaccess, it still waits until download is complete (just as if it was downloading to cache first) and it just get's connected
and show open/save dialog.
So, I used this code (It's modified version of resumable http download found on internet)
function _output_file($file, $path)
{
$size = filesize($path.$file);
@ob_end_clean(); //turn off output buffering to decrease cpu usage
// required for IE, otherwise Content-Disposition may be ignored
if(ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
header('Content-Type: application/force-download');
header('Content-Disposition: attachment; filename="'.basename($file).'"');
header("Content-Transfer-Encoding: binary");
header('Accept-Ranges: bytes');
/* The three lines below basically make the
download non-cacheable */
header("Cache-control: no-cache, pre-check=0, post-check=0");
header("Cache-control: private");
header('Pragma: private');
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
// multipart-download and download resuming support
if(isset($_SERVER['HTTP_RANGE']))
{
list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2);
list($range) = explode(",",$range,2);
list($range, $range_end) = explode("-", $range);
$range=intval($range);
if(!$range_end) {
$range_end=$size-1;
} else {
$range_end=intval($range_end);
}
$new_length = $range_end-$range+1;
header("HTTP/1.1 206 Partial Content");
header("Content-Length: $new_length");
header("Content-Range: bytes $range-$range_end/$size");
} else {
$new_length=$size;
header("Content-Length: ".$size);
}
/* output the file itself */
$chunksize = 1*(1024*1024); //you may want to change this
$bytes_send = 0;
if ($file = fopen($path.$file, 'rb'))
{
if(isset($_SERVER['HTTP_RANGE']))
fseek($file, $range);
while
(!feof($file) &&
(!connection_aborted()) &&
($bytes_send<$new_length) )
{
$buffer = fread($file, $chunksize);
print($buffer); //echo($buffer); // is also possible
flush();
$bytes_send += strlen($buffer);
}
fclose($file);
} else die('Error - can not open file.');
die();
}
and then in model:
function download_file($filename){
/*
DOWNLOAD
*/
$path = "datadirwithmyfiles/"; //directory
//track analytics
include('includes/Galvanize.php'); //great plugin
$GA = new Galvanize('UA-XXXXXXX-7');
$GA->trackPageView();
$this->_output_file($filename, $path);
}
It works as expected in all mentiond browser on Win / MAC - so far, no problems with it.