Class.SessionUtils.php

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<?php
/*
 * @author Anakeen
 * @license http://creativecommons.org/licenses/by-nc-sa/2.0/fr/ Anakeen - licence CC
 * @package FDL
*/

class SessionUtils
{
    
    private $dbaccess;
    
    function __construct($dbaccess)
    {
        $this->dbaccess = $dbaccess;
    }
    
    function getSessionMaxAge()
    {
        $query = new DbObj($this->dbaccess);
        $err = $query->exec_query("SELECT val FROM paramv WHERE name = 'CORE_SESSIONMAXAGE'");
        if ($err != "") {
            error_log(__CLASS__ . "::" . __FUNCTION__ . " " . "exec_query returned with error: " . $err);
            return false;
        }
        if ($query->numrows() <= 0) {
            error_log(__CLASS__ . "::" . __FUNCTION__ . " " . "exec_query returned an empty result set");
            return false;
        }
        $res = $query->fetch_array(0);
        if (is_numeric($res['val'])) {
            return $res['val'] . " seconds";
        }
        return $res['val'];
    }
    
    function getSessionMaxAgeSeconds($default = "1 week")
    {
        $session_maxage = $this->getSessionMaxAge($default);
        if ($session_maxage === false) {
            return false;
        }
        if (preg_match('/^(\d+)\s+(\w+)/i', $session_maxage, $m)) {
            $maxage = $m[1];
            $unit = strtolower($m[2]);
            switch (substr($unit, 0, 1)) {
                case 'y':
                    $maxage = $maxage * 364 * 24 * 60 * 60;
                    break; # years
                    
                case 'm':
                    if (substr($unit, 0, 2) == 'mo') {
                        $maxage = $maxage * 30 * 24 * 60 * 60;
                        break; # months
                        
                    } else {
                        $maxage = $maxage * 60;
                        break; # minutes
                        
                    }
                case 'w':
                    $maxage = $maxage * 7 * 24 * 60 * 60;
                    break; # weeks
                    
                case 'd':
                    $maxage = $maxage * 24 * 60 * 60;
                    break; # days
                    
                case 'h':
                    $maxage = $maxage * 60 * 60;
                    break; # hours
                    
                case 's':
                    break; # seconds
                    
                default:
                    return FALSE;
            }
            return $maxage;
        }
        return FALSE;
    }
    
    function deleteExpiredSessionFiles()
    {
        include_once ('WHAT/Lib.Prefix.php');
        
        global $pubdir;
        
        $session_maxage = $this->getSessionMaxAgeSeconds();
        if ($session_maxage === false) {
            $err = sprintf("Malformed CORE_SESSIONMAXAGE");
            return $err;
        }
        $maxage = time() - $session_maxage;
        
        $sessionDir = sprintf("%s/session", $pubdir);
        $dir = opendir($sessionDir);
        if ($dir === false) {
            $err = sprintf("Error opening directory '%s'.", $sessionDir);
            return $err;
        }
        
        $sessions = array();
        while ($file = readdir($dir)) {
            if (preg_match("/^sess_(.+)$/", $file, $m)) {
                $sess_id = $m[1];
                $sess_file = sprintf("%s/%s", $sessionDir, $file);
                $stat = @stat($sess_file);
                if ($stat !== false && $stat['mtime'] < $maxage) {
                    @unlink($sess_file);
                }
            }
        }
        closedir($dir);
        
        return "";
    }
}
?>