function tryToGetExistingThread()
{
$threadid = verify_param('thread', "/^\\d{1,8}\$/", '');
$thread = null;
if (empty($threadid)) {
$visitor = GetVisitorFromRequestAndSetCookie();
$thread = MapperFactory::getMapper('Thread')->getActiveThreadForVisitor($visitor['id']);
} else {
$thread = Thread::getInstance()->GetThreadById($threadid);
$token = verify_param('token', "/^\\d{1,8}\$/");
if ($token != $thread['token'] || $thread['state'] == STATE_CLOSED) {
$thread = null;
}
}
if (!empty($thread) && (visitorHasAccess($thread) || empty($threadid))) {
ThreadProcessor::getInstance()->ProcessThread($thread['threadid'], 'ping_visitor');
$thread = Thread::getInstance()->GetThreadById($thread['threadid']);
if (empty($thread) || $thread['state'] == STATE_CLOSED) {
$thread = null;
}
} else {
$thread = null;
}
return $thread;
}
$outformat = verify_param("html", "/^on\$/", "off") == 'on' ? "html" : "xml";
$istyping = verify_param("typed", "/^1\$/", "") == '1';
$viewonly = verify_param("viewonly", "/^true\$/", "false") == 'true';
if (!$isvisitor) {
$o = Operator::getInstance();
$operator = $o->GetLoggedOperator(false);
$f = "i" . "s" . "O" . "p" . "er" . "a" . "to" . "rsL" . "im" . "it" . "E" . "x" . "ce" . "ed" . "ed";
if ($o->{$f}()) {
die;
}
}
$thread = Thread::getInstance()->GetThreadById($threadid);
if (empty($thread) || !isset($thread['token']) || $token != $thread['token']) {
die("wrong thread in thread.php");
}
if ($isvisitor && !visitorHasAccess($thread)) {
show_error("server: visitor has no access to the thread");
}
if ($isvisitor) {
ThreadProcessor::getInstance()->ProcessThread($threadid, 'visitor_ping', array('istyping' => !empty($istyping)));
}
if (!$isvisitor && !$viewonly) {
EventController::getInstance()->dispatchEvent(EventController::EVENT_OPERATOR_PING, array($threadid, 'operator_ping', array('istyping' => !empty($istyping), 'operatorid' => $operator['operatorid'])));
}
$operator = null;
if (!$isvisitor && !$viewonly) {
$operator = Operator::getInstance()->GetLoggedOperator();
$viewonly = $thread['operatorid'] != $operator['operatorid'] && !empty($thread['operatorid']);
}
//$visitSession = VisitSession::GetInstance()->GetVisitSessionById($thread['visitsessionid']);
$v = GetVisitorFromRequestAndSetCookie();