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<?php |
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declare(strict_types=1); |
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namespace HttpSoft\Emitter; |
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use HttpSoft\Emitter\Exception\HeadersAlreadySentException; |
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use HttpSoft\Emitter\Exception\OutputAlreadySentException; |
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use InvalidArgumentException; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\StreamInterface; |
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use function flush; |
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use function ob_get_length; |
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use function ob_get_level; |
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use function preg_match; |
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use function sprintf; |
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use function strlen; |
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use function str_replace; |
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use function strtolower; |
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use function trim; |
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use function ucwords; |
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final class SapiEmitter implements EmitterInterface |
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{ |
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/** |
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* @var int|null |
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*/ |
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private ?int $bufferLength; |
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/** |
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* @param int|null $bufferLength |
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* @throws InvalidArgumentException if buffer length is integer type and less than or one. |
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*/ |
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public function __construct(int $bufferLength = null) |
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{ |
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if ($bufferLength !== null && $bufferLength < 1) { |
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throw new InvalidArgumentException(sprintf( |
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'Buffer length for `%s` must be greater than zero; received `%d`.', |
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self::class, |
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$bufferLength |
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)); |
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} |
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$this->bufferLength = $bufferLength; |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @throws HeadersAlreadySentException if headers already sent. |
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* @throws OutputAlreadySentException if output has been emitted previously. |
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*/ |
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public function emit(ResponseInterface $response, bool $withoutBody = false): void |
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{ |
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if (headers_sent()) { |
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throw HeadersAlreadySentException::create(); |
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} |
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if (ob_get_level() > 0 && ob_get_length() > 0) { |
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throw OutputAlreadySentException::create(); |
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} |
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$this->emitHeaders($response); |
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$this->emitStatusLine($response); |
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if (!$withoutBody && $response->getBody()->isReadable()) { |
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$this->emitBody($response); |
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} |
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} |
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/** |
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* Loops through and emits each header as specified to `Psr\Http\Message\MessageInterface::getHeaders()`. |
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* |
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* @param ResponseInterface $response |
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*/ |
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private function emitHeaders(ResponseInterface $response): void |
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{ |
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foreach ($response->getHeaders() as $name => $values) { |
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$name = str_replace(' ', '-', ucwords(strtolower(str_replace('-', ' ', (string) $name)))); |
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$firstReplace = ($name === 'Set-Cookie') ? false : true; |
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foreach ($values as $value) { |
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header("{$name}: {$value}", $firstReplace); |
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$firstReplace = false; |
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} |
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} |
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} |
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/** |
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* Emits the response status line. |
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* |
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* @param ResponseInterface $response |
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* @psalm-suppress RedundantCastGivenDocblockType |
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*/ |
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private function emitStatusLine(ResponseInterface $response): void |
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{ |
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$statusCode = (int) $response->getStatusCode(); |
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$reasonPhrase = trim((string) $response->getReasonPhrase()); |
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$protocolVersion = trim((string) $response->getProtocolVersion()); |
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$status = $statusCode . (!$reasonPhrase ? '' : " {$reasonPhrase}"); |
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header("HTTP/{$protocolVersion} {$status}", true, $statusCode); |
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} |
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/** |
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* Emits the message body. |
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* |
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* @param ResponseInterface $response |
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* @psalm-suppress MixedArgument |
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*/ |
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private function emitBody(ResponseInterface $response): void |
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{ |
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if ($this->bufferLength === null) { |
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echo $response->getBody(); |
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return; |
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} |
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flush(); |
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$body = $response->getBody(); |
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$range = $this->parseContentRange($response->getHeaderLine('content-range')); |
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if (isset($range['unit']) && $range['unit'] === 'bytes') { |
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$this->emitBodyRange($body, $range['first'], $range['last']); |
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return; |
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} |
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if ($body->isSeekable()) { |
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$body->rewind(); |
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} |
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while (!$body->eof()) { |
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echo $body->read($this->bufferLength); |
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} |
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} |
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/** |
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* Emits a range of the message body. |
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* |
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* @param StreamInterface $body |
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* @param int $first |
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* @param int $last |
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* @psalm-suppress PossiblyNullArgument |
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*/ |
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private function emitBodyRange(StreamInterface $body, int $first, int $last): void |
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{ |
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$length = $last - $first + 1; |
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if ($body->isSeekable()) { |
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$body->seek($first); |
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} |
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while ($length >= $this->bufferLength && !$body->eof()) { |
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$contents = $body->read($this->bufferLength); |
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$length -= strlen($contents); |
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echo $contents; |
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} |
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1 |
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if ($length > 0 && !$body->eof()) { |
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echo $body->read($length); |
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} |
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1 |
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} |
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/** |
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* Parse Content-Range header. |
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* |
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* @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.16 |
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* @param string $header |
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* @return array|null |
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*/ |
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private function parseContentRange(string $header): ?array |
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{ |
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if (preg_match('/(?P<unit>[\w]+)\s+(?P<first>\d+)-(?P<last>\d+)\/(?P<length>\d+|\*)/', $header, $matches)) { |
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return [ |
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'unit' => $matches['unit'], |
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'first' => (int) $matches['first'], |
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'last' => (int) $matches['last'], |
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'length' => ($matches['length'] === '*') ? '*' : (int) $matches['length'], |
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]; |
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} |
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return null; |
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} |
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} |
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httpsoft /
http-emitter
