koel/app/Http/Streamers/PHPStreamer.php

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<?php
namespace App\Http\Streamers;
class PHPStreamer extends BaseStreamer implements StreamerInterface
{
public function __construct($id)
{
parent::__construct($id);
}
/**
* Stream the current song using the most basic PHP method: readfile()
* Credits: DaveRandom @ http://stackoverflow.com/a/4451376/794641.
*/
public function stream()
{
// Get the 'Range' header if one was sent
if (isset($_SERVER['HTTP_RANGE'])) {
// IIS/Some Apache versions
$range = $_SERVER['HTTP_RANGE'];
} elseif (function_exists('apache_request_headers') && $apache = apache_request_headers()) {
// Try Apache again
$headers = [];
foreach ($apache as $header => $val) {
$headers[strtolower($header)] = $val;
}
$range = isset($headers['range']) ? $headers['range'] : false;
} else {
// We can't get the header/there isn't one set
$range = false;
}
// Get the data range requested (if any)
$fileSize = filesize($this->song->path);
if ($range) {
$partial = true;
list($param, $range) = explode('=', $range);
if (strtolower(trim($param)) != 'bytes') {
// Bad request - range unit is not 'bytes'
abort(400);
}
$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
abort(400);
}
if ($range[0] === '') {
// First number missing, return last $range[1] bytes
$end = $fileSize - 1;
$start = $end - intval($range[0]);
} elseif ($range[1] === '') {
// Second number missing, return from byte $range[0] to end
$start = intval($range[0]);
$end = $fileSize - 1;
} else {
// Both numbers present, return specific range
$start = intval($range[0]);
$end = intval($range[1]);
if ($end >= $fileSize || (!$start && (!$end || $end == ($fileSize - 1)))) {
// Invalid range/whole file specified, return whole file
$partial = false;
}
}
$length = $end - $start + 1;
} else {
// No range requested
$partial = false;
}
// Send standard headers
header("Content-Type: {$this->contentType}");
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header("Content-Length: $length");
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header('Content-Disposition: attachment; filename="'.basename($this->song->path).'"');
header('Accept-Ranges: bytes');
// if requested, send extra headers and part of file...
if ($partial) {
header('HTTP/1.1 206 Partial Content');
header("Content-Range: bytes $start-$end/$fileSize");
if (!$fp = fopen($this->song->path, 'r')) {
// Error out if we can't read the file
abort(500);
}
if ($start) {
fseek($fp, $start);
}
while ($length) {
// Read in blocks of 8KB so we don't chew up memory on the server
$read = ($length > 8192) ? 8192 : $length;
$length -= $read;
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echo fread($fp, $read);
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}
fclose($fp);
} else {
// ...otherwise just send the whole file
readfile($this->song->path);
}
exit;
}
}