150 lines
3.7 KiB
PHP
150 lines
3.7 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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* ResponseHeaderBag is a container for Response HTTP headers.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class ResponseHeaderBag extends HeaderBag
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{
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protected $computedCacheControl = array();
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/**
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* Constructor.
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*
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* @param array $headers An array of HTTP headers
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*/
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public function __construct(array $headers = array())
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{
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parent::__construct($headers);
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if (!isset($this->headers['cache-control'])) {
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$this->set('cache-control', '');
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function __toString()
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{
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$cookies = '';
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foreach ($this->cookies as $cookie) {
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$cookies .= 'Set-Cookie: '.$cookie."\r\n";
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}
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return parent::__toString().$cookies;
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}
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/**
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* {@inheritdoc}
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*/
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public function replace(array $headers = array())
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{
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parent::replace($headers);
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if (!isset($this->headers['cache-control'])) {
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$this->set('cache-control', '');
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function set($key, $values, $replace = true)
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{
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parent::set($key, $values, $replace);
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// ensure the cache-control header has sensible defaults
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if (in_array(strtr(strtolower($key), '_', '-'), array('cache-control', 'etag', 'last-modified', 'expires'))) {
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$computed = $this->computeCacheControlValue();
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$this->headers['cache-control'] = array($computed);
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$this->computedCacheControl = $this->parseCacheControl($computed);
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function remove($key)
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{
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parent::remove($key);
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if ('cache-control' === strtr(strtolower($key), '_', '-')) {
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$this->computedCacheControl = array();
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function hasCacheControlDirective($key)
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{
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return array_key_exists($key, $this->computedCacheControl);
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}
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/**
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* {@inheritdoc}
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*/
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public function getCacheControlDirective($key)
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{
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return array_key_exists($key, $this->computedCacheControl) ? $this->computedCacheControl[$key] : null;
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}
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/**
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* Clears a cookie in the browser
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*
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* @param string $name
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* @param string $path
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* @param string $domain
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* @return void
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*/
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public function clearCookie($name, $path = null, $domain = null)
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{
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$this->setCookie(new Cookie($name, null, 1, $path, $domain));
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}
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/**
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* Returns the calculated value of the cache-control header.
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*
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* This considers several other headers and calculates or modifies the
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* cache-control header to a sensible, conservative value.
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*
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* @return string
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*/
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protected function computeCacheControlValue()
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{
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if (!$this->cacheControl && !$this->has('ETag') && !$this->has('Last-Modified') && !$this->has('Expires')) {
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return 'no-cache';
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}
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if (!$this->cacheControl) {
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// conservative by default
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return 'private, must-revalidate';
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}
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$header = $this->getCacheControlHeader();
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if (isset($this->cacheControl['public']) || isset($this->cacheControl['private'])) {
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return $header;
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}
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// public if s-maxage is defined, private otherwise
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if (!isset($this->cacheControl['s-maxage'])) {
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return $header.', private';
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}
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return $header;
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}
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}
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