<?php

if(isset($_GET['room'])){
	$room=strtolower(preg_replace('/[^A-Za-z0-9]/i','',$_GET['room']));
	if(strlen($room)>=3){
		$roomfile=md5(VIRTUALHOST.'qr'.$room);
		if(file_exists('./data/room-qr/'.$roomfile.'.png')){
			header("Content-type: image/png");
			echo file_get_contents('./data/room-qr/'.$roomfile.'.png');
			exit;
		} else {
			require_once('./tools/qr/qrlib.php');
			QRcode::png($room, './data/room-qr/'.$roomfile.'.png', 'L', 8, 2);
			header("Content-type: image/png");
			echo file_get_contents('./data/room-qr/'.$roomfile.'.png');
			exit;
		}
	} else {
		echo 'Invalid room number!';
	}
} else {
	echo 'Room number not defined!';
	die();
}

?>