/**
* @param RequestInterface $request
* @param ResponseInterface $response
* @return CacheEntry|null entry to save, null if can't cache it
*/
protected function getCacheObject(RequestInterface $request, ResponseInterface $response)
{
if (!isset($this->statusAccepted[$response->getStatusCode()])) {
// Don't cache it
return;
}
$cacheControl = new KeyValueHttpHeader($response->getHeader('Cache-Control'));
$varyHeader = new KeyValueHttpHeader($response->getHeader('Vary'));
if ($varyHeader->has('*')) {
// This will never match with a request
return;
}
if ($cacheControl->has('no-store')) {
// No store allowed (maybe some sensitives data...)
return;
}
if ($cacheControl->has('no-cache')) {
// Stale response see RFC7234 section 5.2.1.4
$entry = new CacheEntry($request, $response, new \DateTime('-1 seconds'));
return $entry->hasValidationInformation() ? $entry : null;
}
foreach ($this->ageKey as $key) {
if ($cacheControl->has($key)) {
return new CacheEntry($request, $response, new \DateTime('+' . (int) $cacheControl->get($key) . 'seconds'));
}
}
if ($response->hasHeader('Expires')) {
$expireAt = \DateTime::createFromFormat(\DateTime::RFC1123, $response->getHeaderLine('Expires'));
if ($expireAt !== false) {
return new CacheEntry($request, $response, $expireAt);
}
}
return new CacheEntry($request, $response, new \DateTime('-1 seconds'));
}
/**
* @param ResponseInterface $response
* @return CacheEntry|null entry to save, null if can't cache it
*/
protected function getCacheObject(ResponseInterface $response)
{
if ($response->hasHeader("Cache-Control")) {
$cacheControlDirectives = $response->getHeader("Cache-Control");
if (in_array("no-store", $cacheControlDirectives)) {
// No store allowed (maybe some sensitives data...)
return null;
}
if (in_array("no-cache", $cacheControlDirectives)) {
// Stale response see RFC7234 section 5.2.1.4
$entry = new CacheEntry($response, new \DateTime('-1 seconds'));
return $entry->hasValidationInformation() ? $entry : null;
}
$matches = [];
if (preg_match('/^max-age=([0-9]*)$/', $response->getHeaderLine("Cache-Control"), $matches)) {
// Handle max-age header
return new CacheEntry($response, new \DateTime('+' . $matches[1] . 'seconds'));
}
}
if ($response->hasHeader("Expires")) {
$expireAt = \DateTime::createFromFormat('D, d M Y H:i:s T', $response->getHeaderLine("Expires"));
if ($expireAt !== FALSE) {
return new CacheEntry($response, $expireAt);
}
}
return new CacheEntry($response, new \DateTime('1 days ago'));
}
/**
* @param ResponseInterface $response
* @return CacheEntry|null entry to save, null if can't cache it
*/
protected function getCacheObject(ResponseInterface $response)
{
if ($response->hasHeader("Cache-Control")) {
$values = new KeyValueHttpHeader($response->getHeader("Cache-Control"));
if ($values->has('no-store')) {
// No store allowed (maybe some sensitives data...)
return null;
}
if ($values->has('no-cache')) {
// Stale response see RFC7234 section 5.2.1.4
$entry = new CacheEntry($response, new \DateTime('-1 seconds'));
return $entry->hasValidationInformation() ? $entry : null;
}
if ($values->has('max-age')) {
return new CacheEntry($response, new \DateTime('+' . $values->get('max-age') . 'seconds'));
}
return new CacheEntry($response, new \DateTime());
}
if ($response->hasHeader("Expires")) {
$expireAt = \DateTime::createFromFormat('D, d M Y H:i:s T', $response->getHeaderLine("Expires"));
if ($expireAt !== FALSE) {
return new CacheEntry($response, $expireAt);
}
}
return new CacheEntry($response, new \DateTime('-1 seconds'));
}
/**
* {@inheritdoc}
*/
public function save($key, CacheEntry $data)
{
try {
$lifeTime = $data->getTTL();
if ($lifeTime >= 0) {
return $this->cache->save($key, gzcompress(serialize($data)), $lifeTime);
}
} catch (\Exception $ignored) {
// No fail if we can't save it the storage
}
return false;
}
/**
* @param ResponseInterface $response
* @param KeyValueHttpHeader $cacheControl
* @return CacheEntry|null
*/
protected function getCacheObjectForCacheControl(ResponseInterface $response, KeyValueHttpHeader $cacheControl)
{
if ($cacheControl->has('no-store')) {
// No store allowed (maybe some sensitives data...)
return null;
}
if ($cacheControl->has('no-cache')) {
// Stale response see RFC7234 section 5.2.1.4
$entry = new CacheEntry($response, new \DateTime('-1 seconds'));
return $entry->hasValidationInformation() ? $entry : null;
}
if ($cacheControl->has('max-age')) {
return new CacheEntry($response, new \DateTime('+' . (int) $cacheControl->get('max-age') . 'seconds'));
}
return new CacheEntry($response, new \DateTime());
}
/**
* {@inheritdoc}
*/
public function save($key, CacheEntry $data)
{
try {
$lifeTime = $data->getTTL();
if ($lifeTime === 0) {
return $this->cache->forever($key, serialize($data));
} else {
if ($lifeTime > 0) {
return $this->cache->add($key, serialize($data), $lifeTime);
}
}
} catch (\Exception $ignored) {
// No fail if we can't save it the storage
}
return false;
}
/**
* @param RequestInterface $request
* @param CacheEntry $cacheEntry
*
* @return RequestInterface
*/
protected static function getRequestWithReValidationHeader(RequestInterface $request, CacheEntry $cacheEntry)
{
if ($cacheEntry->getResponse()->hasHeader('Last-Modified')) {
$request = $request->withHeader('If-Modified-Since', $cacheEntry->getResponse()->getHeader('Last-Modified'));
}
if ($cacheEntry->getResponse()->hasHeader('Etag')) {
$request = $request->withHeader('If-None-Match', $cacheEntry->getResponse()->getHeader('Etag'));
}
return $request;
}
/**
* @param RequestInterface $request
* @param CacheStorageInterface $cacheStorage
* @param CacheEntry $cacheEntry
* @return bool if added
*/
protected static function addReValidationRequest(RequestInterface $request, CacheStorageInterface &$cacheStorage, CacheEntry $cacheEntry)
{
// Add the promise for revalidate
if (static::$client !== null) {
/** @var RequestInterface $request */
$request = $request->withHeader("X-ReValidation", "1");
static::$waitingRevalidate[] = static::$client->sendAsync($request)->then(function (ResponseInterface $response) use($request, &$cacheStorage, $cacheEntry) {
if ($response->getStatusCode() == 304) {
// Not modified => cache entry is re-validate
/** @var ResponseInterface $response */
$response = $response->withStatus($cacheEntry->getResponse()->getStatusCode());
$response = $response->withBody($cacheEntry->getResponse()->getBody());
}
$cacheStorage->cache($request, $response);
});
return true;
}
return false;
}
