/**
* Force the download of a file by the user's browser by preventing any
* caching. Contains a workaround for Internet Explorer.
*
* @link http://support.microsoft.com/kb/316431
* @link http://support.microsoft.com/kb/812935
*
* @uses download::dialog()
* @uses download::send()
*
* @param string a file path or file name
* @param mixed data to be sent if the filename does not exist
* @param string suggested filename to display in the download
* @return void
*/
public static function force($filename = NULL, $data = NULL, $nicename = NULL)
{
download::dialog(empty($nicename) ? $filename : $nicename);
// Prevent caching
header('Expires: Thu, 01 Jan 1970 00:00:00 GMT');
if (request::user_agent('browser') === 'Internet Explorer' and request::user_agent('version') <= '6.0') {
// HTTP 1.0
header('Pragma:');
// HTTP 1.1 with IE extensions
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
} else {
// HTTP 1.0
header('Pragma: no-cache');
// HTTP 1.1
header('Cache-Control: no-cache, max-age=0');
}
if (is_file($filename)) {
download::send($filename);
} else {
download::send($filename, $data);
}
}
public function media($type = NULL, $file = NULL)
{
// Get the file path from the request
$file = implode('/', URI::instance()->segment_array(2));
// Find the file extension
$ext = pathinfo($file, PATHINFO_EXTENSION);
// Remove the extension from the filename
$file = substr($file, 0, -(strlen($ext) + 1));
// Find the file
if (!($file = Kohana::find_file('media', $file, FALSE, $ext))) {
Event::run('system.404');
}
// Tell browsers to cache the file for an hour. Chrome especially seems to not want to cache things
expires::check(3600);
// Send the file content as the response, and send some basic headers
download::send($file);
}
