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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Yii\Web; |
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use InvalidArgumentException; |
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use Psr\Http\Message\ResponseInterface; |
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use Yiisoft\Http\Status; |
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use Yiisoft\Yii\Web\Exception\HeadersHaveBeenSentException; |
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use function flush; |
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use function in_array; |
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use function sprintf; |
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use function strtolower; |
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/** |
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* SapiEmitter sends a response using standard PHP Server API i.e. with {@see header()} and "echo". |
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*/ |
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final class SapiEmitter |
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{ |
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private const NO_BODY_RESPONSE_CODES = [ |
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Status::CONTINUE, |
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Status::SWITCHING_PROTOCOLS, |
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Status::PROCESSING, |
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Status::NO_CONTENT, |
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Status::RESET_CONTENT, |
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Status::NOT_MODIFIED, |
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]; |
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private const DEFAULT_BUFFER_SIZE = 8_388_608; // 8MB |
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private int $bufferSize; |
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public function __construct(int $bufferSize = null) |
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{ |
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if ($bufferSize !== null && $bufferSize <= 0) { |
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throw new InvalidArgumentException('Buffer size must be greater than zero.'); |
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} |
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$this->bufferSize = $bufferSize ?? self::DEFAULT_BUFFER_SIZE; |
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} |
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/** |
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* Respond to the client with headers and body. |
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* |
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* @param ResponseInterface $response Response object to send. |
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* @param bool $withoutBody If body should be ignored. |
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* |
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* @throws HeadersHaveBeenSentException |
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*/ |
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public function emit(ResponseInterface $response, bool $withoutBody = false): void |
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{ |
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$status = $response->getStatusCode(); |
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$withoutBody = $withoutBody || !$this->shouldOutputBody($response); |
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$withoutContentLength = $withoutBody || $response->hasHeader('Transfer-Encoding'); |
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if ($withoutContentLength) { |
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$response = $response->withoutHeader('Content-Length'); |
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} |
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// We can't send headers if they are already sent. |
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if (headers_sent()) { |
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throw new HeadersHaveBeenSentException(); |
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} |
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header_remove(); |
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// Send HTTP Status-Line. |
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header(sprintf( |
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'HTTP/%s %d %s', |
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$response->getProtocolVersion(), |
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$status, |
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$response->getReasonPhrase() |
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), true, $status); |
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// Send headers. |
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foreach ($response->getHeaders() as $header => $values) { |
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$replaceFirst = strtolower($header) !== 'set-cookie'; |
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foreach ($values as $value) { |
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header("{$header}: {$value}", $replaceFirst); |
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$replaceFirst = false; |
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} |
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} |
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if (!$withoutBody) { |
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if (!$withoutContentLength && !$response->hasHeader('Content-Length')) { |
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$contentLength = $response->getBody()->getSize(); |
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if ($contentLength !== null) { |
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header("Content-Length: {$contentLength}", true); |
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} |
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} |
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$this->emitBody($response); |
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} |
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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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$body->rewind(); |
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} |
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while (!$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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private function shouldOutputBody(ResponseInterface $response): bool |
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{ |
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if (in_array($response->getStatusCode(), self::NO_BODY_RESPONSE_CODES, true)) { |
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return false; |
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} |
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// Check if body is empty. |
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$body = $response->getBody(); |
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if (!$body->isReadable()) { |
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return false; |
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} |
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$size = $body->getSize(); |
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if ($size !== null) { |
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return $size > 0; |
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} |
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if ($body->isSeekable()) { |
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$body->rewind(); |
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$byte = $body->read(1); |
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if ($byte === '' || $body->eof()) { |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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yiisoft /
yii-web
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