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<?php
class VideoStream
{
private $path = "";
private $stream = "";
private $start = -1;
private $end = -1;
private $size = 0;
function __construct($filePath)
{
$this->path = $filePath;
}
/**
* Decrypts a msg using sodium
*/
private function decrypt($msg) {
$key = "v6jM4s0hYqa52m8Bt5c1z7Celv6hFbnF";
$nonce = "mf5cOb6g19QRbX93bD6Fpj5d";
return sodium_crypto_secretbox_open($msg, $nonce, $key); // decr
}
/**
* Open stream
*/
private function open()
{
if (!($this->stream = fopen($this->path, 'rb'))) {
die('Could not open stream for reading');
}
}
/**
* Close curretly opened stream
*/
private function end()
{
fclose($this->stream);
exit;
}
/**
* Calculate the size of the decrypted video, based on $val,
* the size of the encrypted video.
* Works as long as the video has been encrypted by chunks of 1024 bytes
* (each chunck takes 16 bytes more when encrypted)
*/
private function clearSize($val)
{
$fullChuncksNb = floor($val/1040); // nb of chuncks of 1024 bytes (1024+16)
$lastChunckSize = $val - ($fullChuncksNb * 1040) - 16; // size of the last chunk (decrypted)
return $fullChuncksNb * 1024 + $lastChunckSize;
}
/**
* Set proper header to serve the video content
*/
private function setHeader()
{
ob_get_clean();
header("Content-Type: video/mp4");
header("Cache-Control: max-age=2592000, public");
header("Expires: ".gmdate('D, d M Y H:i:s', time()+2592000) . ' GMT');
header("Last-Modified: ".gmdate('D, d M Y H:i:s', @filemtime($this->path)) . ' GMT' );
$this->start = 0;
$this->size = $this->clearSize(filesize($this->path));
$this->cryptSize = filesize($this->path);
$this->end = $this->size - 1;
header("Accept-Ranges: bytes");
if (isset($_SERVER['HTTP_RANGE'])) {
$c_start = $this->start;
$c_end = $this->end;
list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
if (strpos($range, ',') !== false) {
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $this->start-$this->end/$this->size");
exit;
}
if ($range == '-') {
$c_start = $this->size - substr($range, 1);
}else{
$range = explode('-', $range);
$c_start = $range[0];
$c_end = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $c_end;
}
$c_end = ($c_end > $this->end) ? $this->end : $c_end;
if ($c_start > $c_end || $c_start > $this->size - 1 || $c_end >= $this->size) {
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $this->start-$this->end/$this->size");
exit;
}
$this->start = $c_start;
$this->end = $c_end;
$this->length = $this->end - $this->start + 1;
header('HTTP/1.1 206 Partial Content');
header("Content-Length: " . $this->length);
header("Content-Range: bytes $this->start-$this->end/".$this->size);
}
else
{
header("Content-Length: ". $this->size);
}
}
/**
* Perform the streaming of calculated range
*/
private function stream()
{
set_time_limit(0);
$bytesToRead = 1040;
// z_start = index of the chunck containing start
$z_start = $this->start;
$z_start /= 1024;
$z_start = floor($z_start);
// z_end = index of the chunck containing end
$z_end = $this->end;
$z_end /= 1024;
$z_end = floor($z_end);
// let's go at the beginning of the chunk containing z_start
fseek($this->stream, $z_start * $bytesToRead);
// read the chunk and decrypt it
$data = fread($this->stream, $bytesToRead); // size 1040
$data = $this->decrypt($data); // size 1024
// extracts the relevant bytes from this chunk
$len = ($z_end > $z_start) ? 1023 - ($this->start%1024) + 1 : $this->end - $this->start + 1;
$bytes = mb_substr($data, ($this->start%1024), $len, '8bit');
// keep record of how much bytes has been returned so far
$written = $len;
echo $bytes;
flush();
// i = pos of the cursor in the crypted stream (could be 1040, 2080, ...)
$i = ftell($this->stream);
while (!feof($this->stream) && $i < $this->cryptSize)
{
// if we are in last chunk of the crypted file (length < 1024)
if (($i + $bytesToRead) > $this->cryptSize - 1)
$bytesToRead = $this->cryptSize - $i;
// read and decrypt
$data = fread($this->stream, $bytesToRead);
$data = $this->decrypt($data);
// if I don't need all the bytes of this chunck
if ($written + 1024 > $this->length) {
$len = $this->length - $written;
$bytes2 = mb_substr($data, 0, $len, '8bit');
echo $bytes2;
flush();
return;
} else {
echo $data;
$written += 1024;
flush();
}
$i += 1040;
}
}
/**
* Start streaming video content
*/
function start()
{
$this->open();
$this->setHeader();
$this->stream();
$this->end();
}
}
$filePath = "file";
$stream = new VideoStream($filePath);
$stream->start();
?> |
Streamer une video cryptée
Répondre avec citation
Ligne 82 du streamer j'avais ce $this->log qui datait d'un debug d'il y a quelques jours. Je ne sais pas si c'est ça (ça me surprend, quand même, que firefox ait pu lancer le machin avec cette fonction qui n'existe pas), mais depuis que j'ai remis cette fonction, brave/chrome a le même comportement que firefox. 
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