function RequestFileUpload($_user, $_filename)
{
$fileid = md5(namebase($_filename) . $this->UserId . $this->BrowserId);
$filemask = $this->UserId . "_" . $fileid;
$fileurid = EX_FILE_UPLOAD_REQUEST . "_" . $fileid;
$request = new FileUploadRequest($fileurid, $this->DesiredChatPartner);
$request->SenderUserId = $this->UserId;
$request->FileName = namebase($_filename);
$request->FileMask = $filemask;
$request->FileId = $fileid;
$request->SenderBrowserId = $this->BrowserId;
if (dataSetExists($request->TargetFile)) {
$request->Load();
if ($request->Permission == PERMISSION_FULL) {
$_user->AddFunctionCall("top.lz_chat_file_start_upload('" . $_filename . "');", false);
} else {
if ($request->Permission == PERMISSION_NONE) {
$_user->AddFunctionCall("top.lz_chat_file_stop();", false);
$_user->AddFunctionCall("top.lz_chat_file_error(1);", false);
$request->Destroy();
}
}
} else {
if (!dataSetExists($request->TargetFile)) {
if (!isValidUploadFile($_filename)) {
$_user->AddFunctionCall("top.lz_chat_file_error(2);", false);
} else {
$request->Save();
}
}
}
return $_user;
}