134 lines
4.3 KiB
PHP
134 lines
4.3 KiB
PHP
<?php
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namespace BookStack\Http;
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use BookStack\Util\WebSafeMimeSniffer;
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use Illuminate\Http\Request;
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/**
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* Helper wrapper for range-based stream response handling.
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* Much of this used symfony/http-foundation as a reference during build.
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* URL: https://github.com/symfony/http-foundation/blob/v6.0.20/BinaryFileResponse.php
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* License: MIT license, Copyright (c) Fabien Potencier.
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*/
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class RangeSupportedStream
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{
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protected string $sniffContent = '';
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protected array $responseHeaders = [];
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protected int $responseStatus = 200;
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protected int $responseLength = 0;
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protected int $responseOffset = 0;
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public function __construct(
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protected $stream,
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protected int $fileSize,
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Request $request,
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) {
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$this->responseLength = $this->fileSize;
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$this->parseRequest($request);
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}
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/**
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* Sniff a mime type from the stream.
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*/
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public function sniffMime(): string
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{
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$offset = min(2000, $this->fileSize);
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$this->sniffContent = fread($this->stream, $offset);
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return (new WebSafeMimeSniffer())->sniff($this->sniffContent);
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}
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/**
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* Output the current stream to stdout before closing out the stream.
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*/
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public function outputAndClose(): void
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{
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// End & flush the output buffer, if we're in one, otherwise we still use memory.
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// Output buffer may or may not exist depending on PHP `output_buffering` setting.
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// Ignore in testing since output buffers are used to gather a response.
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if (!empty(ob_get_status()) && !app()->runningUnitTests()) {
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ob_end_clean();
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}
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$outStream = fopen('php://output', 'w');
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$sniffLength = strlen($this->sniffContent);
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$bytesToWrite = $this->responseLength;
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if ($sniffLength > 0 && $this->responseOffset < $sniffLength) {
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$sniffEnd = min($sniffLength, $bytesToWrite + $this->responseOffset);
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$sniffOutLength = $sniffEnd - $this->responseOffset;
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$sniffOutput = substr($this->sniffContent, $this->responseOffset, $sniffOutLength);
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fwrite($outStream, $sniffOutput);
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$bytesToWrite -= $sniffOutLength;
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} else if ($this->responseOffset !== 0) {
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fseek($this->stream, $this->responseOffset);
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}
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stream_copy_to_stream($this->stream, $outStream, $bytesToWrite);
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fclose($this->stream);
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fclose($outStream);
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}
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public function getResponseHeaders(): array
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{
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return $this->responseHeaders;
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}
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public function getResponseStatus(): int
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{
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return $this->responseStatus;
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}
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protected function parseRequest(Request $request): void
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{
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$this->responseHeaders['Accept-Ranges'] = $request->isMethodSafe() ? 'bytes' : 'none';
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$range = $this->getRangeFromRequest($request);
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if ($range) {
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[$start, $end] = $range;
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if ($start < 0 || $start > $end) {
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$this->responseStatus = 416;
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$this->responseHeaders['Content-Range'] = sprintf('bytes */%s', $this->fileSize);
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} elseif ($end - $start < $this->fileSize - 1) {
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$this->responseLength = $end < $this->fileSize ? $end - $start + 1 : -1;
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$this->responseOffset = $start;
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$this->responseStatus = 206;
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$this->responseHeaders['Content-Range'] = sprintf('bytes %s-%s/%s', $start, $end, $this->fileSize);
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$this->responseHeaders['Content-Length'] = $end - $start + 1;
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}
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}
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if ($request->isMethod('HEAD')) {
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$this->responseLength = 0;
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}
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}
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protected function getRangeFromRequest(Request $request): ?array
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{
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$range = $request->headers->get('Range');
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if (!$range || !$request->isMethod('GET') || !str_starts_with($range, 'bytes=')) {
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return null;
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}
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if ($request->headers->has('If-Range')) {
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return null;
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}
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[$start, $end] = explode('-', substr($range, 6), 2) + [0];
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$end = ('' === $end) ? $this->fileSize - 1 : (int) $end;
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if ('' === $start) {
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$start = $this->fileSize - $end;
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$end = $this->fileSize - 1;
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} else {
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$start = (int) $start;
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}
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$end = min($end, $this->fileSize - 1);
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return [$start, $end];
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}
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}
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