<?

session_start();

if (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] == "logout")

{

	logout();

}

// If a user had just entered his/her login && password, store them in our session.

if(isset($_POST["authenticate"]))

{

    	$_SESSION["userpwd"] = $_POST["password"];

    	$_SESSION["userlogin"] = $_POST["username"];

}

// Check if the session hasnt expired yet.

if ((isset($_SESSION["userid"])) && ($_SESSION["lastmod"] != "") && ((time() - $_SESSION["lastmod"]) > $EXPIRE))

{

	logout( _('Session expired, please login again.'),"error");

}

// If the session hasn't expired yet, give our session a fresh new timestamp.

$_SESSION["lastmod"] = time();

if(isset($_SESSION["userlogin"]) && isset($_SESSION["userpwd"]))

{

    //Username and password are set, lets try to authenticate.

	$result = $db->query("SELECT id, fullname, level FROM users WHERE username='". $_SESSION["userlogin"]  ."' AND password='". md5($_SESSION["userpwd"])  ."' AND active=1");

	if($result->numRows() == 1)

	{

        	$rowObj = $result->fetchRow();

		$_SESSION["userid"] = $rowObj["id"];

		$_SESSION["name"] = $rowObj["fullname"];

		$_SESSION["level"] = $rowObj["level"];

        	if($_POST["authenticate"])

        	{

            		//If a user has just authenticated, redirect him to index with timestamp, so post-data gets lost.

            		session_write_close();

            		clean_page("index.php");

            		exit;

        	}

    	}

    	else

    	{

        	//Authentication failed, retry.

	        auth( _('Authentication failed!'),"error");

	}

}

else

{

	//No username and password set, show auth form (again).

	auth();

}

/*

 * Print the login form.

 */

function auth($msg="",$type="success")

{

	include_once('inc/header.inc.php');

	if ( $msg )

	{

		print "<div class=\"$type\">$msg</div>\n";

	}

	?>

	<h2><? echo _('Login'); ?></h2>

	<?

	?>

	<form method="post" action="<? echo $_SERVER["PHP_SELF"] ?>">

	 <table border="0">

	  <tr>

	   <td class="n"><? echo _('Login'); ?>:</td>

	   <td class="n"><input type="text" class="input" name="username"></td>

	  </tr>

	  <tr>

	   <td class="n"><? echo _('Password'); ?>:</td>

	   <td class="n"><input type="password" class="input" name="password"></td>

	  </tr>

	  <tr>

	   <td class="n">&nbsp;</td>

	   <td class="n">

	    <input type="submit" name="authenticate" class="button" value=" <? echo _('Login'); ?> ">

	   </td>

	  </tr>

	 </table>

	</form>

	<?

	include_once('inc/footer.inc.php');

	exit;

}

/*

 * Logout the user and kickback to login form.

 */

function logout($msg="")

{

	if ( $msg == "" ) {

		$msg = _('You have logged out.');

		$type = "success";

	};

	unset($_SESSION["userid"]);

	unset($_SESSION["name"]);

	unset($_SESSION["level"]);;

	session_destroy();

	session_write_close();

	auth($msg, $type);

	exit;

}

?>