forked from blallo/rss-bridge
82ed2c5ffb
JSON format does not serialize object instances, which we don't want anyways, and improves readability. The hashing algorithm changed to md5 to prevent collisions with existing cache files
115 lines
2.4 KiB
PHP
115 lines
2.4 KiB
PHP
<?php
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/**
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* Cache with file system
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*/
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class FileCache implements CacheInterface {
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protected $path;
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protected $param;
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public function loadData(){
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return json_decode(file_get_contents($this->getCacheFile()), true);
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}
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public function saveData($datas){
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$writeStream = file_put_contents($this->getCacheFile(), json_encode($datas, JSON_PRETTY_PRINT));
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if(!$writeStream) {
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throw new \Exception("Cannot write the cache... Do you have the right permissions ?");
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}
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return $this;
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}
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public function getTime(){
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$cacheFile = $this->getCacheFile();
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if(file_exists($cacheFile)){
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return filemtime($cacheFile);
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}
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return false;
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}
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public function purgeCache($duration){
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$cachePath = $this->getPath();
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if(file_exists($cachePath)){
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$cacheIterator = new RecursiveIteratorIterator(
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new RecursiveDirectoryIterator($cachePath),
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RecursiveIteratorIterator::CHILD_FIRST
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);
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foreach($cacheIterator as $cacheFile){
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if(in_array($cacheFile->getBasename(), array('.', '..')))
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continue;
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elseif($cacheFile->isFile()){
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if(filemtime($cacheFile->getPathname()) < time() - $duration)
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unlink($cacheFile->getPathname());
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}
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}
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}
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}
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/**
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* Set cache path
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* @return self
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*/
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public function setPath($path){
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if(is_null($path) || !is_string($path)){
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throw new \Exception('The given path is invalid!');
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}
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$this->path = $path;
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// Make sure path ends with '/' or '\'
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$lastchar = substr($this->path, -1, 1);
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if($lastchar !== '/' && $lastchar !== '\\')
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$this->path .= '/';
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if(!is_dir($this->path))
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mkdir($this->path, 0755, true);
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return $this;
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}
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/**
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* Set HTTP GET parameters
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* @return self
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*/
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public function setParameters(array $param){
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$this->param = array_map('strtolower', $param);
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return $this;
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}
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/**
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* Return cache path (and create if not exist)
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* @return string Cache path
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*/
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protected function getPath(){
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if(is_null($this->path)){
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throw new \Exception('Call "setPath" first!');
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}
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return $this->path;
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}
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/**
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* Get the file name use for cache store
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* @return string Path to the file cache
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*/
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protected function getCacheFile(){
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return $this->getPath() . $this->getCacheName();
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}
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/**
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* Determines file name for store the cache
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* return string
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*/
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protected function getCacheName(){
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if(is_null($this->param)){
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throw new \Exception('Call "setParameters" first!');
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}
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return hash('md5', http_build_query($this->param)) . '.cache';
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}
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}
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