<?php
if (php_sapi_name() == "cli")
  return true;

// Define session max duration
if (!isset($session_max_duration))
	$session_max_duration = (12*60*60); // Default to 12h
ini_set('session.gc_maxlifetime', $session_max_duration);
ini_set('session.cookie_lifetime', $session_max_duration);

// Start session
session_start();

// Init session key
if (!isset($_SESSION['session_key'])) {
	$_SESSION['session_key']=uniqid();
}

// Handle session timeout
if ($session_timeout) {
	if (!isset($_SESSION['session_last_access'])) {
		logging('DEBUG', 'Set initial session last access');
		$_SESSION['session_last_access'] = time();
	}
	elseif ($_SESSION['session_last_access'] > (time() - $session_timeout)) {
		logging('DEBUG', 'Session timeout not expired, update session last access (Previous value : '.$_SESSION['session_last_access'].')');
		$_SESSION['session_last_access'] = time();
	}
	else {
		logging('INFO', 'Session destroyed due to inactivity');
		session_destroy();
	}
}

function check_session_key($value=null) {
  if (is_null($value) && isset($_REQUEST['session_key']))
    $value = $_REQUEST['session_key'];
  return ($value && $_SESSION['session_key'] == $value);
}