404 lines
11 KiB
PHP
404 lines
11 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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* This code is partially based on the Rack-Cache library by Ryan Tomayko,
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* which is released under the MIT license.
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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\HttpKernel\HttpCache;
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\Response;
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/**
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* Store implements all the logic for storing cache metadata (Request and Response headers).
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Store implements StoreInterface
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{
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private $root;
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private $keyCache;
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private $locks;
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/**
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* Constructor.
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*
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* @param string $root The path to the cache directory
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*/
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public function __construct($root)
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{
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$this->root = $root;
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if (!is_dir($this->root)) {
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mkdir($this->root, 0777, true);
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}
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$this->keyCache = new \SplObjectStorage();
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$this->locks = array();
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}
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/**
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* Cleanups storage.
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*/
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public function cleanup()
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{
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// unlock everything
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foreach ($this->locks as $lock) {
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@unlink($lock);
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}
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$error = error_get_last();
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if (1 === $error['type'] && false === headers_sent()) {
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// send a 503
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header('HTTP/1.0 503 Service Unavailable');
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header('Retry-After: 10');
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echo '503 Service Unavailable';
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}
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}
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/**
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* Locks the cache for a given Request.
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*
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* @param Request $request A Request instance
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*
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* @return Boolean|string true if the lock is acquired, the path to the current lock otherwise
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*/
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public function lock(Request $request)
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{
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if (false !== $lock = @fopen($path = $this->getPath($this->getCacheKey($request).'.lck'), 'x')) {
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fclose($lock);
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$this->locks[] = $path;
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return true;
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}
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return $path;
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}
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/**
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* Releases the lock for the given Request.
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*
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* @param Request $request A Request instance
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*/
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public function unlock(Request $request)
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{
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return @unlink($this->getPath($this->getCacheKey($request).'.lck'));
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}
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/**
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* Locates a cached Response for the Request provided.
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*
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* @param Request $request A Request instance
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*
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* @return Response|null A Response instance, or null if no cache entry was found
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*/
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public function lookup(Request $request)
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{
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$key = $this->getCacheKey($request);
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if (!$entries = $this->getMetadata($key)) {
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return null;
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}
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// find a cached entry that matches the request.
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$match = null;
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foreach ($entries as $entry) {
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if ($this->requestsMatch(isset($entry[1]['vary'][0]) ? $entry[1]['vary'][0] : '', $request->headers->all(), $entry[0])) {
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$match = $entry;
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break;
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}
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}
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if (null === $match) {
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return null;
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}
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list($req, $headers) = $match;
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if (is_file($body = $this->getPath($headers['x-content-digest'][0]))) {
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return $this->restoreResponse($headers, $body);
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}
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// TODO the metaStore referenced an entity that doesn't exist in
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// the entityStore. We definitely want to return nil but we should
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// also purge the entry from the meta-store when this is detected.
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return null;
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}
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/**
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* Writes a cache entry to the store for the given Request and Response.
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*
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* Existing entries are read and any that match the response are removed. This
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* method calls write with the new list of cache entries.
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*
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* @param Request $request A Request instance
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* @param Response $response A Response instance
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*
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* @return string The key under which the response is stored
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*/
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public function write(Request $request, Response $response)
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{
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$key = $this->getCacheKey($request);
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$storedEnv = $this->persistRequest($request);
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// write the response body to the entity store if this is the original response
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if (!$response->headers->has('X-Content-Digest')) {
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$digest = 'en'.sha1($response->getContent());
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if (false === $this->save($digest, $response->getContent())) {
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throw new \RuntimeException('Unable to store the entity.');
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}
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$response->headers->set('X-Content-Digest', $digest);
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if (!$response->headers->has('Transfer-Encoding')) {
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$response->headers->set('Content-Length', strlen($response->getContent()));
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}
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}
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// read existing cache entries, remove non-varying, and add this one to the list
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$entries = array();
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$vary = $response->headers->get('vary');
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foreach ($this->getMetadata($key) as $entry) {
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if (!isset($entry[1]['vary'][0])) {
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$entry[1]['vary'] = array('');
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}
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if ($vary != $entry[1]['vary'][0] || !$this->requestsMatch($vary, $entry[0], $storedEnv)) {
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$entries[] = $entry;
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}
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}
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$headers = $this->persistResponse($response);
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unset($headers['age']);
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array_unshift($entries, array($storedEnv, $headers));
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if (false === $this->save($key, serialize($entries))) {
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throw new \RuntimeException('Unable to store the metadata.');
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}
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return $key;
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}
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/**
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* Invalidates all cache entries that match the request.
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*
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* @param Request $request A Request instance
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*/
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public function invalidate(Request $request)
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{
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$modified = false;
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$key = $this->getCacheKey($request);
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$entries = array();
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foreach ($this->getMetadata($key) as $entry) {
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$response = $this->restoreResponse($entry[1]);
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if ($response->isFresh()) {
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$response->expire();
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$modified = true;
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$entries[] = array($entry[0], $this->persistResponse($response));
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} else {
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$entries[] = $entry;
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}
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}
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if ($modified) {
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if (false === $this->save($key, serialize($entries))) {
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throw new \RuntimeException('Unable to store the metadata.');
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}
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}
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// As per the RFC, invalidate Location and Content-Location URLs if present
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foreach (array('Location', 'Content-Location') as $header) {
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if ($uri = $request->headers->get($header)) {
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$subRequest = Request::create($uri, 'get', array(), array(), array(), $request->server->all());
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$this->invalidate($subRequest);
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}
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}
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}
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/**
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* Determines whether two Request HTTP header sets are non-varying based on
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* the vary response header value provided.
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*
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* @param string $vary A Response vary header
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* @param array $env1 A Request HTTP header array
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* @param array $env2 A Request HTTP header array
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*
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* @return Boolean true if the the two environments match, false otherwise
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*/
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private function requestsMatch($vary, $env1, $env2)
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{
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if (empty($vary)) {
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return true;
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}
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foreach (preg_split('/[\s,]+/', $vary) as $header) {
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$key = strtr(strtolower($header), '_', '-');
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$v1 = isset($env1[$key]) ? $env1[$key] : null;
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$v2 = isset($env2[$key]) ? $env2[$key] : null;
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if ($v1 !== $v2) {
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return false;
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}
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}
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return true;
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}
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/**
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* Gets all data associated with the given key.
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*
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* Use this method only if you know what you are doing.
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*
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* @param string $key The store key
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*
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* @return array An array of data associated with the key
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*/
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private function getMetadata($key)
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{
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if (false === $entries = $this->load($key)) {
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return array();
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}
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return unserialize($entries);
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}
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/**
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* Purges data for the given URL.
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*
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* @param string $url A URL
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*
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* @return Boolean true if the URL exists and has been purged, false otherwise
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*/
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public function purge($url)
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{
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if (is_file($path = $this->getPath($this->getCacheKey(Request::create($url))))) {
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unlink($path);
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return true;
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}
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return false;
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}
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/**
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* Loads data for the given key.
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*
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* @param string $key The store key
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*
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* @return string The data associated with the key
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*/
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private function load($key)
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{
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$path = $this->getPath($key);
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return is_file($path) ? file_get_contents($path) : false;
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}
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/**
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* Save data for the given key.
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*
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* @param string $key The store key
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* @param string $data The data to store
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*/
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private function save($key, $data)
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{
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$path = $this->getPath($key);
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if (!is_dir(dirname($path)) && false === @mkdir(dirname($path), 0777, true)) {
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return false;
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}
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$tmpFile = tempnam(dirname($path), basename($path));
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if (false === $fp = @fopen($tmpFile, 'wb')) {
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return false;
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}
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@fwrite($fp, $data);
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@fclose($fp);
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if ($data != file_get_contents($tmpFile)) {
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return false;
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}
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if (false === @rename($tmpFile, $path)) {
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return false;
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}
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@chmod($path, 0666 & ~umask());
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}
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public function getPath($key)
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{
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return $this->root.DIRECTORY_SEPARATOR.substr($key, 0, 2).DIRECTORY_SEPARATOR.substr($key, 2, 2).DIRECTORY_SEPARATOR.substr($key, 4, 2).DIRECTORY_SEPARATOR.substr($key, 6);
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}
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/**
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* Returns a cache key for the given Request.
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*
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* @param Request $request A Request instance
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*
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* @return string A key for the given Request
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*/
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private function getCacheKey(Request $request)
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{
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if (isset($this->keyCache[$request])) {
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return $this->keyCache[$request];
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}
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return $this->keyCache[$request] = 'md'.sha1($request->getUri());
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}
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/**
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* Persists the Request HTTP headers.
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*
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* @param Request $request A Request instance
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*
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* @return array An array of HTTP headers
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*/
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private function persistRequest(Request $request)
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{
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return $request->headers->all();
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}
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/**
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* Persists the Response HTTP headers.
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*
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* @param Response $response A Response instance
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*
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* @return array An array of HTTP headers
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*/
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private function persistResponse(Response $response)
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{
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$headers = $response->headers->all();
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$headers['X-Status'] = array($response->getStatusCode());
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return $headers;
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}
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/**
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* Restores a Response from the HTTP headers and body.
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*
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* @param array $headers An array of HTTP headers for the Response
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* @param string $body The Response body
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*/
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private function restoreResponse($headers, $body = null)
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{
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$status = $headers['X-Status'][0];
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unset($headers['X-Status']);
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if (null !== $body) {
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$headers['X-Body-File'] = array($body);
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}
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return new Response($body, $status, $headers);
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}
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}
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