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<?php |
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namespace RichanFongdasen\Varnishable\Concerns; |
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use Illuminate\Http\Response; |
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use Symfony\Component\HttpFoundation\HeaderBag; |
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trait ManipulateHttpResponse |
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{ |
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/** |
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* HTTP Request object. |
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* |
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* @var \Symfony\Component\HttpFoundation\HeaderBag |
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*/ |
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protected $requestHeaders; |
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/** |
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* Acknowledge the ESI support and send a specific |
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* HTTP header as a reply. |
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* |
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* @param \Illuminate\Http\Response $response |
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* |
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* @return void |
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*/ |
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protected function acknowledgeEsiSupport(Response $response) |
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{ |
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$esiHeader = $this->getConfig('esi_capability_header'); |
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if ($esiHeader = $this->requestHeaders->get($esiHeader)) { |
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$response->header($this->getConfig('esi_reply_header'), $esiHeader); |
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} |
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} |
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/** |
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* Add cacheable header so varnish can recognize |
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* the response as a cacheable content. |
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* |
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* @param \Illuminate\Http\Response $response |
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* @param int $cacheDuration |
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*/ |
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protected function addCacheableHeader(Response $response, $cacheDuration) |
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{ |
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$duration = $this->getCacheDuration((int) $cacheDuration); |
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return $response->header($this->getConfig('cacheable_header'), '1') |
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->header('Cache-Control', 'public, max-age='.$duration); |
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} |
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/** |
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* Add uncacheable header so varnish can recognize |
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* the response as an uncacheable content. |
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* |
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* @param \Illuminate\Http\Response $response |
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*/ |
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public function addUncacheableHeader(Response $response) |
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{ |
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return $response->header($this->getConfig('uncacheable_header'), '1'); |
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} |
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/** |
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* Add an ETag header to the current response. |
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* |
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* @param \Illuminate\Http\Response $response |
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* |
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* @return void |
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*/ |
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protected function addEtagHeader(Response $response) |
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{ |
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if ($this->getConfig('use_etag')) { |
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$response->setEtag(md5($response->getContent())); |
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} |
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} |
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/** |
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* Normalize the given cache duration and convert |
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* it to seconds. |
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* |
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* @param int $duration |
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* |
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* @return int|float |
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*/ |
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protected function getCacheDuration($duration) |
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{ |
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$cacheInMinutes = ($duration > 0) ? $duration : $this->getConfig('cache_duration'); |
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return $cacheInMinutes * 60; |
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} |
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/** |
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* Manipulate the current Http response. |
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* |
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* @param \Illuminate\Http\Response $response |
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* @param int $cacheDuration |
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* |
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* @return \Illuminate\Http\Response |
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*/ |
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public function manipulate(Response $response, $cacheDuration) |
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{ |
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$this->acknowledgeEsiSupport($response); |
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if ($this->shouldNotCache($response)) { |
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return $response; |
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} |
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$this->addCacheableHeader($response, $cacheDuration); |
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$this->addEtagHeader($response); |
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return $response; |
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} |
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/** |
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* Set the current Http request headers. |
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* |
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* @param \Symfony\Component\HttpFoundation\HeaderBag $headers |
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*/ |
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public function setRequestHeaders(HeaderBag $headers) |
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{ |
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$this->requestHeaders = $headers; |
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} |
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/** |
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* Check if the current response shouldn't be cached. |
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* |
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* @param \Illuminate\Http\Response $response |
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* |
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* @return string|array |
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*/ |
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protected function shouldNotCache(Response $response) |
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{ |
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return $response->headers->get($this->getConfig('uncacheable_header')); |
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} |
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/** |
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* Get configuration value for a specific key. |
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* |
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* @param string $key |
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* |
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* @return mixed |
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*/ |
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abstract public function getConfig($key); |
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} |
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richan-fongdasen /
laravel-varnishable
