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<?php |
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/** |
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* Spiral Framework. |
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* |
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* @license MIT |
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* @author Anton Titov (Wolfy-J) |
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* |
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* @see https://github.com/zendframework/zend-httphandlerrunner for the canonical source repository |
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* @copyright Copyright (c) 2018 Zend Technologies USA Inc. (https://www.zend.com) |
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* @license https://github.com/zendframework/zend-httphandlerrunner/blob/master/LICENSE.md New BSD License |
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*/ |
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declare(strict_types=1); |
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namespace Spiral\Http\Emitter; |
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use Psr\Http\Message\ResponseInterface; |
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use Spiral\Http\Config\HttpConfig; |
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use Spiral\Http\EmitterInterface; |
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use Spiral\Http\Exception\EmitterException; |
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/** |
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* Source code has been extracted from Zend/Diactoros. |
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*/ |
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final class SapiEmitter implements EmitterInterface |
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{ |
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/** |
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* @var positive-int Preferred chunk size to be read from the stream before emitting. |
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*/ |
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public int $bufferSize = 2_097_152; // 2MB |
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public function __construct(HttpConfig $config) |
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{ |
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if (($chunkSize = $config->getChunkSize()) !== null) { |
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$this->bufferSize = $chunkSize; |
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} |
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} |
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/** |
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* Emits a response for a PHP SAPI environment. |
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* |
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* Emits the status line and headers via the header() function, and the |
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* body content via the output buffer. |
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* |
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* @param ResponseInterface $response |
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*/ |
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public function emit(ResponseInterface $response): bool |
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{ |
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$this->assertNoPreviousOutput(); |
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$this->emitHeaders($response); |
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$this->emitStatusLine($response); |
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$this->emitBody($response); |
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return true; |
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} |
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/** |
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* Emit the message body. |
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1 |
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*/ |
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private function emitBody(ResponseInterface $response): void |
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{ |
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$body = $response->getBody(); |
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if ($body->isSeekable()) { |
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$body->rewind(); |
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} |
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if (!$body->isReadable()) { |
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return; |
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} |
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while (!$body->eof()) { |
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echo $body->read($this->bufferSize); |
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flush(); |
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} |
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} |
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/** |
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* Checks to see if content has previously been sent. |
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* |
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* If either headers have been sent or the output buffer contains content, |
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* raises an exception. |
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* |
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* @throws EmitterException if headers have already been sent. |
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* @throws EmitterException if output is present in the output buffer. |
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1 |
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*/ |
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private function assertNoPreviousOutput(): void |
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{ |
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if (headers_sent()) { |
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throw new EmitterException('Unable to emit response, headers already send.'); |
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} |
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if (ob_get_level() > 0 && ob_get_length() > 0) { |
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throw new EmitterException('Unable to emit response, found non closed buffered output.'); |
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} |
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} |
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/** |
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* Emit the status line. |
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* |
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* Emits the status line using the protocol version and status code from |
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* the response; if a reason phrase is available, it, too, is emitted. |
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* |
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* It is important to mention that this method should be called after |
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* `emitHeaders()` in order to prevent PHP from changing the status code of |
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* the emitted response. |
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* |
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* @param ResponseInterface $response |
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*/ |
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private function emitStatusLine(ResponseInterface $response): void |
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{ |
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$reasonPhrase = $response->getReasonPhrase(); |
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$statusCode = $response->getStatusCode(); |
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header(sprintf( |
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'HTTP/%s %d%s', |
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$response->getProtocolVersion(), |
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$statusCode, |
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($reasonPhrase ? ' ' . $reasonPhrase : '') |
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), true, $statusCode); |
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} |
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/** |
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* Emit response headers. |
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* |
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* Loops through each header, emitting each; if the header value |
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* is an array with multiple values, ensures that each is sent |
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* in such a way as to create aggregate headers (instead of replace |
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* the previous). |
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* |
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* @param ResponseInterface $response |
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*/ |
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private function emitHeaders(ResponseInterface $response): void |
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{ |
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$statusCode = $response->getStatusCode(); |
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foreach ($response->getHeaders() as $header => $values) { |
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$name = $this->filterHeader($header); |
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$first = $name === 'Set-Cookie' ? false : true; |
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foreach ($values as $value) { |
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header(sprintf( |
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'%s: %s', |
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$name, |
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$value |
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), $first, $statusCode); |
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$first = false; |
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} |
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} |
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} |
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/** |
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* Filter a header name to wordcase |
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*/ |
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private function filterHeader(string $header): string |
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{ |
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return ucwords($header, '-'); |
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} |
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} |
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spiral /
framework
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