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<?php |
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namespace Http\Client\Plugin; |
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use Http\Client\Tools\Promise\FulfilledPromise; |
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use Psr\Cache\CacheItemPoolInterface; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* Allow for caching a response. |
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* |
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* @author Tobias Nyholm <[email protected]> |
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*/ |
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class CachePlugin implements Plugin |
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{ |
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/** |
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* @var CacheItemPoolInterface |
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*/ |
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private $pool; |
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/** |
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* Default time to store object in cache. This value is used if CachePlugin::respectCacheHeaders is false or |
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* if cache headers are missing. |
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* |
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* @var int |
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*/ |
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private $defaultTtl; |
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/** |
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* Look at the cache headers to know whether this response may be cached and to |
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* decide how it can be cached. |
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* |
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* @var bool Defaults to true |
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*/ |
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private $respectCacheHeaders; |
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/** |
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* Available options are |
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* - respect_cache_headers: Whether to look at the cache directives or ignore them. |
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* |
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* @param CacheItemPoolInterface $pool |
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* @param array $options |
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*/ |
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public function __construct(CacheItemPoolInterface $pool, array $options = []) |
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{ |
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$this->pool = $pool; |
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$this->defaultTtl = isset($options['default_ttl']) ? $options['default_ttl'] : null; |
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$this->respectCacheHeaders = isset($options['respect_cache_headers']) ? $options['respect_cache_headers'] : true; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function handleRequest(RequestInterface $request, callable $next, callable $first) |
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{ |
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$method = strtoupper($request->getMethod()); |
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// if the request not is cachable, move to $next |
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if ($method !== 'GET' && $method !== 'HEAD') { |
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return $next($request); |
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} |
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// If we can cache the request |
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$key = $this->createCacheKey($request); |
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$cacheItem = $this->pool->getItem($key); |
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if ($cacheItem->isHit()) { |
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// return cached response |
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return new FulfilledPromise($cacheItem->get()); |
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} |
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return $next($request)->then(function (ResponseInterface $response) use ($cacheItem) { |
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if ($this->isCacheable($response)) { |
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$cacheItem->set($response) |
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->expiresAfter($this->getMaxAge($response)); |
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$this->pool->save($cacheItem); |
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} |
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return $response; |
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}); |
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} |
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/** |
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* Verify that we can cache this response. |
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* |
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* @param ResponseInterface $response |
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* |
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* @return bool |
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*/ |
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protected function isCacheable(ResponseInterface $response) |
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{ |
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if (!in_array($response->getStatusCode(), [200, 203, 300, 301, 302, 404, 410])) { |
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return false; |
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} |
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if (!$this->respectCacheHeaders) { |
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return true; |
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} |
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if ($this->getCacheControlDirective($response, 'no-store') || $this->getCacheControlDirective($response, 'private')) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Get the value of a parameter in the cache control header. |
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* |
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* @param ResponseInterface $response |
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* @param string $name The field of Cache-Control to fetch |
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* |
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* @return bool|string The value of the directive, true if directive without value, false if directive not present. |
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*/ |
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private function getCacheControlDirective(ResponseInterface $response, $name) |
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{ |
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$headers = $response->getHeader('Cache-Control'); |
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foreach ($headers as $header) { |
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if (preg_match(sprintf('|%s=?([0-9]+)?|i', $name), $header, $matches)) { |
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// return the value for $name if it exists |
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if (isset($matches[1])) { |
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return $matches[1]; |
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} |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param RequestInterface $request |
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* |
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* @return string |
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*/ |
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private function createCacheKey(RequestInterface $request) |
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{ |
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return md5($request->getMethod().' '.$request->getUri()); |
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} |
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/** |
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* Get a ttl in seconds. It could return null if we do not respect cache headers and got no defaultTtl. |
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* |
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* @param ResponseInterface $response |
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* |
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* @return int|null |
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*/ |
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2 |
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private function getMaxAge(ResponseInterface $response) |
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{ |
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if (!$this->respectCacheHeaders) { |
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return $this->defaultTtl; |
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} |
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// check for max age in the Cache-Control header |
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$maxAge = $this->getCacheControlDirective($response, 'max-age'); |
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if (!is_bool($maxAge)) { |
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$ageHeaders = $response->getHeader('Age'); |
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foreach ($ageHeaders as $age) { |
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return $maxAge - ((int) $age); |
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} |
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return $maxAge; |
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} |
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// check for ttl in the Expires header |
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1 |
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$headers = $response->getHeader('Expires'); |
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1 |
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foreach ($headers as $header) { |
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return (new \DateTime($header))->getTimestamp() - (new \DateTime())->getTimestamp(); |
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1 |
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} |
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1 |
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return $this->defaultTtl; |
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} |
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} |
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php-http /
plugins
