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<?php |
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namespace Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Utils; |
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use Psr7Middlewares\Middleware; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\StreamInterface; |
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/** |
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* Middleware to read the response. |
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*/ |
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class ReadResponse |
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{ |
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use Utils\FileTrait; |
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private $continueOnError = false; |
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/** |
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* Configure if continue to the next middleware if the response has not found |
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* |
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* @param bool $continueOnError |
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* |
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* @return self |
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*/ |
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public function continueOnError($continueOnError = true) |
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{ |
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$this->continueOnError = $continueOnError; |
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return $this; |
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} |
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/** |
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* Execute the middleware. |
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* |
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* @param ServerRequestInterface $request |
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* @param ResponseInterface $response |
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* @param callable $next |
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* |
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* @return ResponseInterface |
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*/ |
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public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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//If the method is not allowed |
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if ($request->getMethod() !== 'GET') { |
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if ($this->continueOnError) { |
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return $next($request, $response); |
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} |
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return $response->withStatus(405); |
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} |
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$body = Middleware::createStream(); |
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$file = $this->getFilename($request); |
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//If the file does not exists, check if is gzipped |
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if (!is_file($file)) { |
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$file .= '.gz'; |
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if (EncodingNegotiator::getEncoding($request) !== 'gzip' || !is_file($file)) { |
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if ($this->continueOnError) { |
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return $next($request, $response); |
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} |
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return $response->withStatus(404); |
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} |
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$response = $response->withHeader('Content-Encoding', 'gzip'); |
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} |
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self::readFile($file, $body); |
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//Handle range header |
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$response = $this->range($request, $response->withBody($body)); |
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if ($this->continueOnError) { |
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return $response; |
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} |
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return $next($request, $response); |
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} |
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/** |
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* Reads a file and write in the body. |
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* |
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* @param string $file |
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* @param StreamInterface $body |
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*/ |
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private static function readFile($file, StreamInterface $body) |
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{ |
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if (filesize($file) <= 4096) { |
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$body->write(file_get_contents($file)); |
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return; |
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} |
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$stream = fopen($file, 'r'); |
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while (!feof($stream)) { |
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$body->write(fread($stream, 4096)); |
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} |
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fclose($stream); |
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} |
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/** |
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* Handle range requests. |
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* |
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* @param ServerRequestInterface $request |
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* @param ResponseInterface $response |
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* |
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* @return ResponseInterface |
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*/ |
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private static function range(ServerRequestInterface $request, ResponseInterface $response) |
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{ |
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$response = $response->withHeader('Accept-Ranges', 'bytes'); |
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$range = $request->getHeaderLine('Range'); |
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if (empty($range) || !($range = self::parseRangeHeader($range))) { |
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return $response; |
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} |
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list($first, $last) = $range; |
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$size = $response->getBody()->getSize(); |
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if ($last === null) { |
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$last = $size - 1; |
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} |
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return $response |
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->withStatus(206) |
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->withHeader('Content-Length', (string) ($last - $first + 1)) |
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->withHeader('Content-Range', sprintf('bytes %d-%d/%d', $first, $last, $size)); |
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} |
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/** |
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* Parses a range header, for example: bytes=500-999. |
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* |
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* @param string $header |
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* |
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* @return false|array [first, last] |
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*/ |
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private static function parseRangeHeader($header) |
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{ |
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if (preg_match('/bytes=(?P<first>\d+)-(?P<last>\d+)?/', $header, $matches)) { |
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return [ |
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(int) $matches['first'], |
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isset($matches['last']) ? (int) $matches['last'] : null, |
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]; |
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} |
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return false; |
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} |
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} |
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oscarotero /
psr7-middlewares
