/**
* Calling this will stream the file to the client.
* The parameter is a bitstream dao.
* Optional second parameter is the download offset in bytes.
*
* @param BitstreamDao $bitstream
* @param int $offset
* @param bool $incrementDownload
* @throws Zend_Exception
*/
public function download($bitstream, $offset = 0, $incrementDownload = false)
{
// Disable gzip output on apache servers (otherwise no progress in browser)
if (function_exists('apache_setenv')) {
apache_setenv('no-gzip', '1');
}
$mimetype = $bitstream->getMimetype();
$path = $bitstream->getAssetstore()->getPath() . '/' . $bitstream->getPath();
$name = $bitstream->getName();
if (!file_exists($path)) {
throw new Zend_Exception('Unable to find file on the disk');
}
$chunkSize = 1024 * 64;
$fileSize = UtilityComponent::fileSize($path);
$handle = fopen($path, 'rb');
if ($handle === false) {
throw new Zend_Exception('Unable to open the file');
}
if (!$this->testingmode) {
// don't send any headers in testing mode since it will break it
$modified = gmdate('D, d M Y H:i:s') . ' GMT';
$contentType = $mimetype;
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Last-Modified: ' . $modified);
// if pdf set the content-type accordingly
if (!isset($contentType) && pathinfo($name, PATHINFO_EXTENSION) == 'pdf') {
$contentType = 'application/pdf';
$enableContentDisposition = false;
}
if (!isset($contentType)) {
$contentType = 'application/octet-stream';
}
// Hack for .vsp files (for OSA)
if (!isset($contentType) && strlen($name) > 4 && substr($name, strlen($name) - 4, 4) == '.vsp') {
$contentType = 'application/isp';
}
$agent = env('HTTP_USER_AGENT');
if (preg_match('%Opera(/| )([0-9].[0-9]{1,2})%', $agent) || preg_match('/MSIE ([0-9].[0-9]{1,2})/', $agent)) {
header('Content-Type: ' . $contentType);
header('Content-Disposition: attachment; filename="' . $name . '"');
header('Expires: 0');
header('Accept-Ranges: bytes');
header('Cache-Control: private', false);
header('Pragma: private');
$httpRange = env('HTTP_RANGE');
if (isset($httpRange)) {
// HTTP range is of the form "bytes=n-" where n is the offset
list(, $range) = explode('=', $httpRange);
$firstByte = strstr($range, '-', true);
$lastByte = $fileSize - 1;
$length = $fileSize - $firstByte;
header('HTTP/1.1 206 Partial Content');
header('Content-Length: ' . $length);
header('Content-Range: bytes ' . $firstByte . '-' . $lastByte . '/' . $fileSize);
fseek($handle, $firstByte);
} else {
header('Content-Length: ' . $fileSize);
}
} else {
header('Accept-Ranges: bytes');
header('Expires: 0');
header('Content-Type: ' . $contentType);
header('Content-Length: ' . $fileSize);
if (!isset($enableContentDisposition) || $enableContentDisposition == true) {
header('Content-Disposition: attachment; filename="' . $name . '"');
}
if (isset($httpRange)) {
list(, $range) = explode('=', $httpRange);
$firstByte = strstr($range, '-', true);
$lastByte = $fileSize - 1;
$length = $fileSize - $firstByte;
header('HTTP/1.1 206 Partial Content');
header('Content-Length: ' . $length);
header('Content-Range: bytes ' . $firstByte . '-' . $lastByte . '/' . $fileSize);
fseek($handle, $firstByte);
}
}
}
ignore_user_abort(true);
// must call this so the script doesn't end as soon as connection closed
// close the database connection so we don't get too many connections problems
Zend_Registry::get('dbAdapter')->closeConnection();
session_write_close();
// unlock session writing for concurrent access
// kill the whole ob stack (Zend uses double nested output buffers)
while (!$this->testingmode && ob_get_level() > 0) {
ob_end_clean();
}
if (is_numeric($offset) && $offset > 0 && $offset <= $fileSize) {
fseek($handle, $offset);
}
while (!feof($handle) && connection_status() == 0) {
echo fread($handle, $chunkSize);
}
if ($incrementDownload && feof($handle)) {
// Only record downloads that actually complete
/** @var ItemModel $itemModel */
$itemModel = MidasLoader::loadModel('Item');
$itemModel->incrementDownloadCount($bitstream->getItemrevision()->getItem());
}
fclose($handle);
if (!$this->testingmode) {
// don't exit if we are in testing mode
exit;
}
}
