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Файловый менеджер - Редактировать - /home/harasnat/www/learning/lib/guzzlehttp/kevinrob/guzzlecache/src/Strategy/PrivateCacheStrategy.php

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<?php namespace Kevinrob\GuzzleCache\Strategy; use Kevinrob\GuzzleCache\CacheEntry; use Kevinrob\GuzzleCache\KeyValueHttpHeader; use Kevinrob\GuzzleCache\Storage\CacheStorageInterface; use Kevinrob\GuzzleCache\Storage\VolatileRuntimeStorage; use Psr\Http\Message\RequestInterface; use Psr\Http\Message\ResponseInterface; /** * This strategy represents a "private" HTTP client. * Pay attention to share storage between application with caution! * * For example, a response with cache-control header "private, max-age=60" * will be cached by this strategy. * * The rules applied are from RFC 7234. * * @see https://tools.ietf.org/html/rfc7234 / class PrivateCacheStrategy implements CacheStrategyInterface { /* * @var CacheStorageInterface / protected $storage; /* * @var int[] / protected $statusAccepted = [ 200 => 200, 203 => 203, 204 => 204, 300 => 300, 301 => 301, 404 => 404, 405 => 405, 410 => 410, 414 => 414, 418 => 418, 501 => 501, ]; /* * @var string[] / protected $ageKey = [ 'max-age', ]; public function __construct(CacheStorageInterface $cache = null) { $this->storage = $cache !== null ? $cache : new VolatileRuntimeStorage(); } /* * @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')); } /** * Generate a key for the response cache. * * @param RequestInterface $request * @param null\|KeyValueHttpHeader $varyHeaders The vary headers which should be honoured by the cache (optional) * * @return string / protected function getCacheKey(RequestInterface $request, KeyValueHttpHeader $varyHeaders = null) { if (!$varyHeaders) { return hash('sha256', $request->getMethod().$request->getUri()); } $cacheHeaders = []; foreach ($varyHeaders as $key => $value) { if ($request->hasHeader($key)) { $cacheHeaders[$key] = $request->getHeader($key); } } return hash('sha256', $request->getMethod().$request->getUri().json_encode($cacheHeaders)); } /* * Return a CacheEntry or null if no cache. * * @param RequestInterface $request * * @return CacheEntry\|null / public function fetch(RequestInterface $request) { /* @var int\|null $maxAge / $maxAge = null; if ($request->hasHeader('Cache-Control')) { $reqCacheControl = new KeyValueHttpHeader($request->getHeader('Cache-Control')); if ($reqCacheControl->has('no-cache')) { // Can't return cache return null; } $maxAge = $reqCacheControl->get('max-age', null); } elseif ($request->hasHeader('Pragma')) { $pragma = new KeyValueHttpHeader($request->getHeader('Pragma')); if ($pragma->has('no-cache')) { // Can't return cache return null; } } $cache = $this->storage->fetch($this->getCacheKey($request)); if ($cache !== null) { $varyHeaders = $cache->getVaryHeaders(); // vary headers exist from a previous response, check if we have a cache that matches those headers if (!$varyHeaders->isEmpty()) { $cache = $this->storage->fetch($this->getCacheKey($request, $varyHeaders)); if (!$cache) { return null; } } if ((string)$cache->getOriginalRequest()->getUri() !== (string)$request->getUri()) { return null; } if ($maxAge !== null) { if ($cache->getAge() > $maxAge) { // Cache entry is too old for the request requirements! return null; } } if (!$cache->isVaryEquals($request)) { return null; } } return $cache; } /* * @param RequestInterface $request * @param ResponseInterface $response * * @return bool true if success / public function cache(RequestInterface $request, ResponseInterface $response) { $reqCacheControl = new KeyValueHttpHeader($request->getHeader('Cache-Control')); if ($reqCacheControl->has('no-store')) { // No caching allowed return false; } $cacheObject = $this->getCacheObject($request, $response); if ($cacheObject !== null) { // store the cache against the URI-only key $success = $this->storage->save( $this->getCacheKey($request), $cacheObject ); $varyHeaders = $cacheObject->getVaryHeaders(); if (!$varyHeaders->isEmpty()) { // also store the cache against the vary headers based key $success = $this->storage->save( $this->getCacheKey($request, $varyHeaders), $cacheObject ); } return $success; } return false; } /* * @param RequestInterface $request * @param ResponseInterface $response * * @return bool true if success / public function update(RequestInterface $request, ResponseInterface $response) { return $this->cache($request, $response); } /* * {@inheritdoc} */ public function delete(RequestInterface $request) { return $this->storage->delete($this->getCacheKey($request)); } }

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