1 files changed, 97 insertions, 0 deletions
diff --git a/admin/Library/Files/Log.php b/admin/Library/Files/Log.php
new file mode 100644
index 0000000..895c26d
--- /dev/null
+++ b/admin/Library/Files/Log.php
@@ -0,0 +1,97 @@
+<?php
+
+// All EasyGiant code is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+// See COPYRIGHT.txt and LICENSE.txt.
+
+if (!defined('EG')) die('Direct access not allowed!');
+
+//class to manage a file di log
+//this is a singleton class
+class Files_Log
+{
+	
+	const DS = DIRECTORY_SEPARATOR;
+	
+	// array of instances of the class
+	//key: name of the instance, value:instance. The name of the instance is also the name of the log file to open
+	private static $instance = array();
+
+	public static $logFolder = './'; //the log folder
+	public static $logExtension = '.log'; //the extension of the log files
+	public static $logPermission = 0777;
+	
+	private $splFile; //SplFileObject
+	
+	//$fileName: the file to open
+	private function __construct($fileName)
+	{
+		$finalChar = self::$logFolder[strlen(self::$logFolder) - 1];
+		if (strcmp($finalChar,self::DS) !== 0) self::$logFolder .= self::DS;
+		
+		$path = self::$logFolder . $fileName . self::$logExtension;
+		$this->splFile = new SplFileObject($path,'a+');
+		//change the permission of the file
+		@chmod($path,self::$logPermission);
+	}
+
+	// The singleton method
+	// $instanceName: name of the key of self::$instance. It is also the name of the log file to open
+	public static function getInstance($instanceName)
+	{
+		if (!isset(self::$instance[$instanceName])) {
+			$className = __CLASS__;
+			self::$instance[$instanceName] = new $className($instanceName);
+		}
+
+		return self::$instance[$instanceName];
+	}
+
+	//write the string $string at the end of the file
+	public function writeString($string,$format = 'Y-m-d H:i:s')
+	{
+		$date = date($format);
+		$this->splFile->fwrite("[$date]\t".$string."\n");
+	}
+
+	//get the date string of the line $line
+	public function getDateString($line)
+	{
+		if (preg_match('/^[\[]{1}([a-zA-Z0-9:\-\s])*[\]]{1}/',$line,$match))
+		{
+			$match[0] = str_replace('[',null,$match[0]);
+			$match[0] = str_replace(']',null,$match[0]);
+			return $match[0];
+		}
+		else
+		{
+			return false;
+		}
+	}
+
+	//delete all the lines older than a number of days equal to $days
+	public function clearBefore($days = 30)
+	{
+		$tempArray = array();
+		$newTime = time() - (int)$days * 24 * 3600;
+		foreach ($this->splFile as $line)
+		{
+			$lineTime = strtotime($this->getDateString($line));
+			if ($lineTime !== false and $lineTime > $newTime)
+			{
+				$tempArray[] = $line;
+			}
+		}
+		$this->splFile->ftruncate(0);
+		foreach ($tempArray as $row)
+		{
+			$this->splFile->fwrite($row);
+		}
+	}
+	
+	// Prevent users to clone the instance
+	public function __clone()
+	{
+		throw new Exception('error in '. __METHOD__.': clone is not allowed');
+	}
+
+}
+\ No newline at end of file