145 lines
3.2 KiB
PHP
145 lines
3.2 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\HttpFoundation;
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/**
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* StreamedResponse represents a streamed HTTP response.
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*
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* A StreamedResponse uses a callback for its content.
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*
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* The callback should use the standard PHP functions like echo
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* to stream the response back to the client. The flush() function
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* can also be used if needed.
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*
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* @see flush()
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class StreamedResponse extends Response
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{
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protected $callback;
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protected $streamed;
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private $headersSent;
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/**
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* @param callable|null $callback A valid PHP callback or null to set it later
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* @param int $status The response status code
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* @param array $headers An array of response headers
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*/
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public function __construct(callable $callback = null, $status = 200, $headers = [])
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{
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parent::__construct(null, $status, $headers);
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if (null !== $callback) {
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$this->setCallback($callback);
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}
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$this->streamed = false;
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$this->headersSent = false;
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}
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/**
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* Factory method for chainability.
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*
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* @param callable|null $callback A valid PHP callback or null to set it later
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* @param int $status The response status code
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* @param array $headers An array of response headers
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*
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* @return static
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*/
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public static function create($callback = null, $status = 200, $headers = [])
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{
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return new static($callback, $status, $headers);
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}
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/**
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* Sets the PHP callback associated with this Response.
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*
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* @param callable $callback A valid PHP callback
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*
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* @return $this
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*/
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public function setCallback(callable $callback)
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{
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$this->callback = $callback;
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return $this;
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}
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/**
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* {@inheritdoc}
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*
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* This method only sends the headers once.
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*
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* @return $this
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*/
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public function sendHeaders()
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{
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if ($this->headersSent) {
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return $this;
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}
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$this->headersSent = true;
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return parent::sendHeaders();
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}
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/**
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* {@inheritdoc}
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*
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* This method only sends the content once.
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*
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* @return $this
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*/
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public function sendContent()
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{
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if ($this->streamed) {
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return $this;
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}
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$this->streamed = true;
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if (null === $this->callback) {
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throw new \LogicException('The Response callback must not be null.');
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}
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\call_user_func($this->callback);
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return $this;
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}
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/**
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* {@inheritdoc}
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*
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* @throws \LogicException when the content is not null
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*
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* @return $this
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*/
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public function setContent($content)
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{
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if (null !== $content) {
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throw new \LogicException('The content cannot be set on a StreamedResponse instance.');
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}
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$this->streamed = true;
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return $this;
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}
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/**
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* {@inheritdoc}
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*/
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public function getContent()
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{
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return false;
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}
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}
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