<?php
/* vim: set ts=4 tw=0 sw=4 noet: */
require_once $CFG->root .'config.php';

class FileSessionHandler {
    private $savePath;
    private $log_level;
    private $log_method;

    public function __construct() {
        global $CFG;

        if (isset($CFG->log_level)) {
            $this->log_level = $CFG->log_level;
        } else {
            $this->log_level = 1;
        }

        if (isset($CFG->log_method)) {
            $this->log_method = $CFG->log_method;
        } else {
            $this->log_level = 'syslog';
        }

        $this->log("Init FileSessionHandler", 4);

    }

    private function log($message, $level = 1) {
        global $CFG;

        if ($level > $this->log_level)
            return;

        $time = date('c');

        $priority = LOG_INFO;
        switch ($level) {
            case 1: $priority = LOG_ERR; break;
            case 2: $priority = LOG_WARNING; break;
            case 3: $priority = LOG_INFO; break;
            case 4: $priority = LOG_DEBUG; break;
        }

        switch ($this->log_method) {
            case 'file':
                if (isset($CFG->log_file)) {
                    if ($CFG->log_file[0] == '/') {
                        $file = $CFG->log_file;
                    } else {
                        $file = $CFG->root.$CFG->log_file;
                    }
                } else {
                    $file = $CFG->root.'qtadmin.log';
                }
                file_put_contents($file, "[$time]: $message\n", FILE_APPEND | LOCK_EX);
                chmod($file, 0600);
                break;
            case 'stderr':
                file_put_contents('php://stderr', "[$time]: $message\n");
                break;
            case 'syslog':
                syslog($priority, $message);
                break;
        }
    }

    public function open($savePath, $sessionName) {
        $this->log("FileSessionHandler->open", 4);
        $this->savePath = $savePath;
        if (!is_dir($this->savePath)) {
            mkdir($this->savePath, 0777);
        }

        return true;
    }

    function close() {
        $this->log("FileSessionHandler->close", 4);
        return true;
    }

    function read($id) {
        return (string)@file_get_contents("$this->savePath/qt_sess_$id");
    }

    function write($id, $data) {
        $this->log("FileSessionHandler->write : $id->$data", 4);
        $result = file_put_contents("$this->savePath/qt_sess_$id", $data);
        chmod("$this->savePath/qt_sess_$id", 0600);

        return ($result === false) ? false : true;
    }

    function destroy($id) {
        $this->log("FileSessionHandler->destroy : $id", 4);
        $file = "$this->savePath/qt_sess_$id";
        if (file_exists($file)) {
            unlink($file);
        }

        return true;
    }

    function gc($maxlifetime) {
        $this->log("FileSessionHandler->gc : $maxlifetime", 4);
        foreach (glob("$this->savePath/qt_sess_*") as $file) {
            if (filemtime($file) + $maxlifetime < time() && file_exists($file)) {
                unlink($file);
            }
        }

        return true;
    }
}

$handler = new FileSessionHandler();
session_set_save_handler(
    array($handler, 'open'),
    array($handler, 'close'),
    array($handler, 'read'),
    array($handler, 'write'),
    array($handler, 'destroy'),
    array($handler, 'gc')
);

// the following prevents unexpected effects when using objects as save handlers
register_shutdown_function('session_write_close');
?>