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<?php declare(strict_types=1); |
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namespace DaveRandom\Resume; |
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final class ResourceServlet |
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{ |
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/** |
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* @var \DaveRandom\Resume\Resource |
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*/ |
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private $resource; |
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/** |
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* Generate the default response headers for this resource |
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* |
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* @return HeaderSet |
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*/ |
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private function generateDefaultHeaders(): HeaderSet |
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{ |
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$ranges = $this->resource instanceof RangeUnitProvider |
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? \implode(',', $this->resource->getRangeUnits()) |
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: 'bytes'; |
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if ($ranges === '') { |
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$ranges = 'none'; |
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} |
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return new HeaderSet([ |
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'Content-Type' => $this->resource->getMimeType(), |
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'Accept-Ranges' => $ranges, |
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]); |
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} |
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/** |
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* Send the headers that are included regardless of whether a range was requested |
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* |
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* @param OutputWriter $outputWriter |
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* @param HeaderSet $headers |
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*/ |
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private function sendHeaders(OutputWriter $outputWriter, HeaderSet $headers) |
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{ |
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foreach ($this->resource->getAdditionalHeaders() as $name => $value) { |
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$headers->setHeader($name, $value); |
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} |
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foreach ($headers as $name => $value) { |
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$outputWriter->sendHeader(\trim($name), \trim($value)); |
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} |
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} |
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/** |
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* Create a Content-Range header corresponding to the specified unit and ranges |
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* |
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* @param string $unit |
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* @param Range[] $ranges |
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* @param int $size |
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* @return string |
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*/ |
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private function getContentRangeHeader(string $unit, array $ranges, int $size): string |
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{ |
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return $unit . ' ' . \implode(',', $ranges) . '/' . $size; |
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} |
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/** |
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* Send the complete resource to the client |
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* |
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* @param OutputWriter $outputWriter |
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* @param HeaderSet $headers |
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*/ |
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private function sendCompleteResource(OutputWriter $outputWriter, HeaderSet $headers) |
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{ |
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$outputWriter->setResponseCode(200); |
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$this->sendHeaders($outputWriter, $headers); |
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$headers->setHeader('Content-Length', (string)$this->resource->getLength()); |
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$this->resource->sendData($outputWriter); |
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} |
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/** |
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* Send the requested ranges to the client |
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* |
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* @param OutputWriter $outputWriter |
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* @param HeaderSet $headers |
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* @param RangeSet $rangeSet |
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*/ |
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private function sendResourceRanges(OutputWriter $outputWriter, HeaderSet $headers, RangeSet $rangeSet) |
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{ |
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$totalResourceSize = $this->resource->getLength(); |
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$ranges = $rangeSet->getRangesForSize($totalResourceSize); |
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$responseBodySize = \array_reduce($ranges, function(int $size, Range $range) { |
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return $size + $range->getLength(); |
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}, 0); |
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$outputWriter->setResponseCode(206); |
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$this->sendHeaders($outputWriter, $headers); |
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$contentRangeHeader = $this->getContentRangeHeader($rangeSet->getUnit(), $ranges, $totalResourceSize); |
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$outputWriter->sendHeader('Content-Range', $contentRangeHeader); |
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$outputWriter->sendHeader('Content-Length', (string)$responseBodySize); |
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foreach ($ranges as $range) { |
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$this->resource->sendData($outputWriter, $range); |
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} |
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} |
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public function __construct(Resource $resource) |
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{ |
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$this->resource = $resource; |
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} |
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/** |
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* Send data from a file based on the Range header described by the supplied RangeSet |
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* |
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* @param RangeSet|null $rangeSet Range header on which the transmission will be based |
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* @param OutputWriter|null $outputWriter Output writer via which resource will be sent |
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*/ |
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public function sendResource(RangeSet $rangeSet = null, OutputWriter $outputWriter = null) |
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{ |
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$outputWriter = $outputWriter ?? new DefaultOutputWriter(); |
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$headers = $this->generateDefaultHeaders(); |
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if ($rangeSet === null) { |
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$this->sendCompleteResource($outputWriter, $headers); |
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} else { |
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$this->sendResourceRanges($outputWriter, $headers, $rangeSet); |
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} |
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} |
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} |
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DaveRandom /
Resume
