Rss-Bridge/caches/FileCache.php

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<?php
/**
* Cache with file system
*/
class FileCache extends CacheAbstract {
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public function loadData(){
$this->isPrepareCache();
$datas = unserialize(file_get_contents($this->getCacheFile()));
return $datas;
}
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public function saveData($datas){
$this->isPrepareCache();
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$writeStream = file_put_contents($this->getCacheFile(), serialize($datas));
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if(!$writeStream) {
throw new \Exception("Cannot write the cache... Do you have the right permissions ?");
}
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return $this;
}
public function getTime(){
$this->isPrepareCache();
$cacheFile = $this->getCacheFile();
if(file_exists($cacheFile)){
return filemtime($cacheFile);
}
return false;
}
public function purgeCache(){
$cacheTimeLimit = time() - 86400; // 86400 -> 24h
$cachePath = $this->getCachePath();
if(file_exists($cachePath)){
$cacheIterator = new RecursiveIteratorIterator(
new RecursiveDirectoryIterator($cachePath),
RecursiveIteratorIterator::CHILD_FIRST
);
foreach($cacheIterator as $cacheFile){
if(in_array($cacheFile->getBasename(), array('.', '..')))
continue;
elseif($cacheFile->isFile()){
if(filemtime($cacheFile->getPathname()) < $cacheTimeLimit)
unlink($cacheFile->getPathname());
}
}
}
}
/**
* Cache is prepared ?
* Note : Cache name is based on request information, then cache must be prepare before use
* @return \Exception|true
*/
protected function isPrepareCache(){
if(is_null($this->param)){
throw new \Exception('Please feed "prepare" method before try to load');
}
return true;
}
/**
* Return cache path (and create if not exist)
* @return string Cache path
*/
protected function getCachePath(){
$cacheDir = __DIR__ . '/../cache/'; // FIXME : configuration ?
// FIXME : implement recursive dir creation
if(!is_dir($cacheDir)){
mkdir($cacheDir,0705);
chmod($cacheDir,0705);
}
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return $cacheDir;
}
/**
* Get the file name use for cache store
* @return string Path to the file cache
*/
protected function getCacheFile(){
return $this->getCachePath() . $this->getCacheName();
}
/**
* Determines file name for store the cache
* return string
*/
protected function getCacheName(){
$this->isPrepareCache();
$stringToEncode = $_SERVER['REQUEST_URI'] . http_build_query($this->param);
$stringToEncode = preg_replace('/(\?|&)format=[^&]*/i', '$1', $stringToEncode);
return hash('sha1', $stringToEncode) . '.cache';
}
}