BookStack/app/Http/Responses/DownloadResponseFactory.php

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<?php
namespace BookStack\Http\Responses;
use BookStack\Util\WebSafeMimeSniffer;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Symfony\Component\HttpFoundation\StreamedResponse;
class DownloadResponseFactory
{
protected Request $request;
public function __construct(Request $request)
{
$this->request = $request;
}
/**
* Create a response that directly forces a download in the browser.
*/
public function directly(string $content, string $fileName): Response
{
return response()->make($content, 200, $this->getHeaders($fileName));
}
/**
* Create a response that forces a download, from a given stream of content.
*/
public function streamedDirectly($stream, string $fileName): StreamedResponse
{
return response()->stream(function () use ($stream) {
// End & flush the output buffer, if we're in one, otherwise we still use memory.
// Output buffer may or may not exist depending on PHP `output_buffering` setting.
// Ignore in testing since output buffers are used to gather a response.
if (!empty(ob_get_status()) && !app()->runningUnitTests()) {
ob_end_clean();
}
fpassthru($stream);
fclose($stream);
}, 200, $this->getHeaders($fileName));
}
/**
* Create a file download response that provides the file with a content-type
* correct for the file, in a way so the browser can show the content in browser,
* for a given content stream.
*/
public function streamedInline($stream, string $fileName): StreamedResponse
{
$sniffContent = fread($stream, 2000);
$mime = (new WebSafeMimeSniffer())->sniff($sniffContent);
return response()->stream(function () use ($sniffContent, $stream) {
echo $sniffContent;
fpassthru($stream);
fclose($stream);
}, 200, $this->getHeaders($fileName, $mime));
}
/**
* Get the common headers to provide for a download response.
*/
protected function getHeaders(string $fileName, string $mime = 'application/octet-stream'): array
{
$disposition = ($mime === 'application/octet-stream') ? 'attachment' : 'inline';
$downloadName = str_replace('"', '', $fileName);
return [
'Content-Type' => $mime,
'Content-Disposition' => "{$disposition}; filename=\"{$downloadName}\"",
'X-Content-Type-Options' => 'nosniff',
];
}
}