The Right Way to Serve Binary Data and Partial Content Using Zend Framework 2

Question

I want to allow binary files with some kind of access control. Since the control is quite complex, I can’t just let Apache serve the files, I have to serve them via PHP using my Zend Framework 2 application. The action is as follows:

public function sendAction() { $filename = /* database action */; $size = filesize($filename); $response = $this->getResponse(); if($this->getRequest()->getHeaders()->has('Range')) { list($unit, $range) = explode('=', $this->getRequest()->getHeaders()->get('Range')->toString()); $ranges = explode(',', $range); $ranges = explode('-', $ranges[0]); $start = (int)$ranges[0]; $end = (int)(isset($ranges[1]) ? $ranges[1] : $size - 1); $length = $start - $end; $response->getHeaders()->addHeaders(array('Content-Type' => 'audio/mpeg', 'Accept-Ranges' => 'bytes', 'Content-Length' => $length - 1)); $response->setStatusCode(206); $f = fopen($filename, 'r'); if($start) fseek($f, $start); $out = ''; while($length) { $read = ($length > 8192) ? 8192 : $length; $length -= $read; $out .= fread($fp,$read); } fclose($f); $response->setContent($out); } else { $response ->setContent(file_get_contents($filename)) ->getHeaders()->addHeaders(array('Content-Type' => 'audio/mpeg', 'Accept-Ranges' => 'bytes')); } return $this->getResponse(); } 

Good for one, I'm sure this is very inefficient, since files are always loaded into RAM entirely for this, before being serviced.

However, this does not work. When I try to access the file, I get the correct audio/mpeg player in Chrome, but then the browser cancels the requests and stops. I can’t play the sound at all.

I couldn’t find any clues on the Internet about how to correctly implement answer 206 in Zend 2, maybe someone can help me here.

Answer 1

You must use a stream.

Sample code from my application

 public function documentAction() { $name = $this->params('name'); try { if (!$this->getServiceLocator()->get('AuthStorage')->hasIdentity()) { throw new \Exception('You must login.'); } $file = getcwd().'/data/uploads/'.pathinfo($name)['basename']; if (file_exists($file)) { $response = new \Zend\Http\Response\Stream(); $headers = new \Zend\Http\Headers(); $headers->addHeaderLine('Content-type', 'application/pdf'); $response->setHeaders($headers); $response->setStream(fopen($file, 'r')); return $response; } else { throw new \Exception('File not exist'); } } catch (\Exception $e) { $this->flashMessenger()->setNamespace('error')->addMessage('404'); return $this->redirect()->toUrl('/'); } } 

Answer 2

This works for rendering PDF in a browser (e.g. PDFJS), streaming mp4 video or a download file.

 $headers = new \Zend\Http\Headers(); $headers->addHeaderLine('Content-Type', $type) ->addHeaderLine('Cache-Control', 'must-revalidate') ->addHeaderLine('Pragma', 'public'); $response = new \Zend\Http\Response(); $downloadFile = false | true; // <-- Change this if($downloadFile) { $headers->addHeaderLine('Content-Disposition', 'attachment; filename="' . $fileName . '"') ->addHeaderLine('Content-Length', $size); // ->addHeaderLine('Set-Cookie', 'fileDownload=true; path=/'); $response = new \Zend\Http\Response\Stream(); $response->setStream(fopen($pathFile, 'r')); $response->setHeaders($headers); return $response; } $size = filesize($pathFile); $start = 0; $end = $size - 1; $buffer = 1024000; // Get the 'Range' header if one was sent if (isset($_SERVER['HTTP_RANGE'])) { $range = $_SERVER['HTTP_RANGE']; // IIS/Some Apache versions } else if ($apache = apache_request_headers()) { // Try Apache again $arrHeaders = array(); foreach ($apache as $header => $val) { $arrHeaders[strtolower($header)] = $val; } if (isset($arrHeaders['range'])) { $range = $arrHeaders['range']; } else { $range = false; // We can't get the header/there isn't one set } } else { $range = false; // We can't get the header/there isn't one set } // Get the data range requested (if any) $size = filesize($pathFile); if ($range) { $partial = true; list($param,$range) = explode('=',$range); if (strtolower(trim($param)) != 'bytes') { // Bad request - range unit is not 'bytes' $response->setStatusCode(400); // 400 Invalid Request exit; } $range = explode(',',$range); $range = explode('-',$range[0]); // We only deal with the first requested range if (count($range) != 2) { // Bad request - 'bytes' parameter is not valid $response->setStatusCode(400); // 400 Invalid Request exit; } if ($range[0] === '') { // First number missing, return last $range[1] bytes $end = $size - 1; $start = $end - intval($range[1]); } else if ($range[1] === '') { // Second number missing, return from byte $range[0] to end $start = intval($range[0]); $end = $size - 1; } else { // Both numbers present, return specific range $start = intval($range[0]); $end = intval($range[1]); if ($end >= $size || (!$start && (!$end || $end == ($size - 1)))) { $partial = false; // Invalid range/whole file specified, return whole file } } $length = $end - $start + 1; } else { $partial = false; // No range requested $length = $size; } // error_log(var_export(array($range, $partial, $length), true)); // Send standard headers $headers->addHeaderLine("Content-Length", $length); $headers->addHeaderLine("Accept-Ranges", "bytes"); // if requested, send extra headers and part of file... if ($partial) { $response->setStatusCode(206); // 206 (Partial Content) $headers->addHeaderLine("Content-Range", "bytes $start-$end/".$size); if (!$fp = fopen($pathFile, 'r')) { // Error out if we can't read the file $response->setStatusCode(500); // 500 Internal Server Error exit; } if ($start) { fseek($fp,$start); } $out = ''; while ($length) { // Read in blocks of 8KB so we don't chew up memory on the server $read = ($length > 8192) ? 8192 : $length; $length -= $read; $out .= fread($fp,$read); } fclose($fp); } else { $out = readfile($pathFile); // ...otherwise just send the whole file } $response->setContent($out); $response->setHeaders($headers); return $response;