phpsec#38 First implementation of file system storage class.

Author: xqus

phpsec/phpsec.store.filesystem.php

@@ -11,4 +11,58 @@
 
 class phpsecStoreFilesystem extends phpsecStore {
 
+  private $_dataDir  = null;
+  public  $_hashType = 'sha256';
+
+  public function __construct($loc) {
+    if(!is_writeable($loc)) {
+      phpsec::error('Storage directory('.$loc.') not writeable');
+      return false;
+    }
+    $this->_dataDir = $loc;
+    return true;
+  }
+
+  public function read($type, $id) {
+    $fileName =  $this->fileName($type, $id);
+    if(!file_exists($fileName)) {
+      return false;
+    }
+    $data = json_decode(file_get_contents($fileName));
+    $mac = phpsecCrypt::pbkdf2($data->data, $id, 1000, 32);
+
+    if($mac != base64_decode($data->mac)) {
+      phpsec::error('Message authentication code invalid while reading store');
+      return false;
+    }
+    return unserialize(base64_decode($data->data));
+  }
+
+  public function write($type, $id, $data) {
+    $fileName =  $this->fileName($type, $id);
+    $saveData['data'] = base64_encode(serialize($data));
+    $saveData['mac']  = base64_encode(phpsecCrypt::pbkdf2($saveData['data'], $id, 1000, 32));
+
+    $data = json_encode($saveData);
+    $fp = fopen($fileName, 'w');
+    if($fp !== false) {
+      if(flock($fp, LOCK_EX)) {
+        fwrite($fp, $data);
+        flock($fp, LOCK_UN);
+        fclose($fp);
+        return true;
+      } else {
+        self::error('Could not lock logfile while writing to store');
+      }
+    }
+    return false;
+  }
+
+  public function delete($type, $id) {
+    @unlink(fileName($type, $id));
+  }
+
+  private function fileName($type, $id) {
+    return $this->_dataDir.'/store_'.$type.'_'.hash($this->_hashType, $id);
+  }
 }