class.ilFileSystemGUI.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilFileSystemGUI
{
        var $ctrl;

        protected $use_upload_directory = false;

        protected $allowed_suffixes = array();

        protected $forbidden_suffixes = array();


        function ilFileSystemGUI($a_main_directory)
        {
                global $lng, $ilCtrl, $tpl, $ilias;

                $this->ctrl =& $ilCtrl;
                $this->lng =& $lng;
                $this->ilias =& $ilias;
                $this->tpl =& $tpl;
                $this->main_dir = $a_main_directory;
                $this->post_dir_path = false;
                $this->commands = array(
                        0 => array(
                                "object" => $this,
                                "method" => "downloadFile",
                                "name" => $lng->txt("download"),
                                "int" => true
                        ),
                        1 => array(
                                "object" => $this,
                                "method" => "confirmDeleteFile",
                                "name" => $lng->txt("delete"),
                                "allow_dir" => true,
                                "int" => true
                        ),
                        2 => array(
                                "object" => $this,
                                "method" => "unzipFile",
                                "name" => $lng->txt("unzip"),
                                "int" => true
                        ),
                        3 => array(
                                "object" => $this,
                                "method" => "renameFileForm",
                                "name" => $lng->txt("rename"),
                                "allow_dir" => true,
                                "int" => true
                        ),
                );

                $this->file_labels = array();
                $this->label_enable = false;
                $this->ctrl->saveParameter($this, "cdir");
                $lng->loadLanguageModule("content");
                $this->setAllowDirectories(true);
                $this->setAllowDirectoryCreation(true);
                $this->setAllowFileCreation(true);
//echo "<br>main_dir:".$this->main_dir.":";
        }

        function setAllowedSuffixes($a_suffixes)
        {
                $this->allowed_suffixes = $a_suffixes;
        }

        function getAllowedSuffixes()
        {
                return $this->allowed_suffixes;
        }

        function setForbiddenSuffixes($a_suffixes)
        {
                $this->forbidden_suffixes = $a_suffixes;
        }

        function getForbiddenSuffixes()
        {
                return $this->forbidden_suffixes;
        }

        function isValidSuffix($a_suffix)
        {
                if (is_array($this->getForbiddenSuffixes()) && in_array($a_suffix, $this->getForbiddenSuffixes()))
                {
                        return false;
                }
                if (is_array($this->getAllowedSuffixes()) && in_array($a_suffix, $this->getAllowedSuffixes()))
                {
                        return true;
                }
                if (!is_array($this->getAllowedSuffixes()) || count($this->getAllowedSuffixes()) == 0)
                {
                        return true;
                }
                return false;
        }


        function setAllowDirectories($a_val)
        {
                $this->allow_directories = $a_val;
        }
        
        function getAllowDirectories()
        {
                return $this->allow_directories;
        }

        function setPostDirPath($a_val)
        {
                $this->post_dir_path = $a_val;
        }

        function getPostDirPath()
        {
                return $this->post_dir_path;
        }

        function setTableId($a_val)
        {
                $this->table_id = $a_val;
        }
        
        function getTableId()
        {
                return $this->table_id;
        }

        function setTitle($a_val)
        {
                $this->title = $a_val;
        }
        
        function getTitle()
        {
                return $this->title;
        }

        function setUseUploadDirectory($a_val)
        {
                $this->use_upload_directory = $a_val;
        }

        function getUseUploadDirectory()
        {
                return $this->use_upload_directory;
        }
        
        protected function setPerformedCommand($command, $pars = "")
        {
                if (!is_array($pars))
                {
                        $pars = array();
                }
                $_SESSION["fsys"]["lastcomm"] = array_merge(
                        array("cmd" => $command), $pars);
        }
        
        public function getLastPerformedCommand()
        {
                $ret = $_SESSION["fsys"]["lastcomm"];
                $_SESSION["fsys"]["lastcomm"] = "none";
                return $ret;
        }
        
        function &executeCommand()
        {
                $next_class = $this->ctrl->getNextClass($this);
                $cmd = $this->ctrl->getCmd("listFiles");

                switch($next_class)
                {

                        default:
                                if (substr($cmd, 0, 11) == "extCommand_")
                                {
                                        $ret =& $this->extCommand(substr($cmd, 11, strlen($cmd) - 11));
                                }
                                else
                                {
                                        $ret =& $this->$cmd();
                                }
                                break;
                }

                return $ret;
        }


        function addCommand(&$a_obj, $a_func, $a_name, $a_single = true,
                $a_allow_dir = false)
        {
                $i = count($this->commands);

                $this->commands[$i]["object"] =& $a_obj;
                $this->commands[$i]["method"] = $a_func;
                $this->commands[$i]["name"] = $a_name;
                $this->commands[$i]["single"] = $a_single;
                $this->commands[$i]["allow_dir"] = $a_allow_dir;

                //$this->commands[] = $arr;
        }

        function clearCommands()
        {
                $this->commands = array();
        }

        function labelFile($a_file, $a_label)
        {
                $this->file_labels[$a_file][] = $a_label;
        }

        function activateLabels($a_act, $a_label_header)
        {
                $this->label_enable = $a_act;
                $this->label_header = $a_label_header;
        }

        function &extCommand($a_nr)
        {
                if (isset($_POST["file"]))
                {
                        // remove ".." items
                        foreach ($_POST["file"] as $k => $v)
                        {
                                if ($_POST["file"][$k] == "..")
                                {
                                        unset($_POST["file"][$k]);
                                }
                        }
                }
                // check if at least one item is select
                else
                {
                        $this->ilias->raiseError($this->lng->txt("no_checkbox"),$this->ilias->error_obj->MESSAGE);
                }

                // check if only one item is select, if command does not allow multiple selection
                if (count($_POST["file"]) > 1 && $this->commands[$a_nr]["single"])
                {
                        $this->ilias->raiseError($this->lng->txt("cont_select_max_one_item"),$this->ilias->error_obj->MESSAGE);
                }

                $cur_subdir = str_replace(".", "", ilUtil::stripSlashes($_GET["cdir"]));

                // collect files and
                $files = array();
                foreach ($_POST["file"] as $k => $v)
                {
                        $file = (!empty($cur_subdir))
                                ? $this->main_dir."/".$cur_subdir."/".ilUtil::stripSlashes($_POST["file"][$k])
                                : $this->main_dir."/".ilUtil::stripSlashes($_POST["file"][$k]);

                        // check wether selected item is a directory
                        if (@is_dir($file) && !$this->commands[$a_nr]["allow_dir"])
                        {
                                $this->ilias->raiseError($this->lng->txt("select_a_file"),$this->ilias->error_obj->MESSAGE);
                        }
                        $file = (!empty($cur_subdir))
                                ? $cur_subdir."/".ilUtil::stripSlashes($_POST["file"][$k])
                                : ilUtil::stripSlashes($_POST["file"][$k]);
                        $files[] = $file;
                }

                if ($this->commands[$a_nr]["single"])
                {
                        $files = $files[0];
                }

                $obj =& $this->commands[$a_nr]["object"];
                $method = $this->commands[$a_nr]["method"];

                return $obj->$method($files);
        }

        public function setAllowDirectoryCreation($a_val)
        {
                $this->directory_creation = $a_val;
        }

        public function getAllowDirectoryCreation()
        {
                return $this->directory_creation;
        }

        public function setAllowFileCreation($a_val)
        {
                $this->file_creation = $a_val;
        }

        public function getAllowFileCreation()
        {
                return $this->file_creation;
        }

        function listFiles()
        {
                global $ilToolbar, $lng, $ilCtrl;
                

                // determine directory
                // FIXME: I have to call stripSlashes here twice, because I could not
                //        determine where the second layer of slashes is added to the
                //        URL Parameter
                $cur_subdir = ilUtil::stripSlashes(ilUtil::stripSlashes($_GET["cdir"]));
                $new_subdir = ilUtil::stripSlashes(ilUtil::stripSlashes($_GET["newdir"]));

                if($new_subdir == "..")
                {
                        $cur_subdir = substr($cur_subdir, 0, strrpos($cur_subdir, "/"));
                }
                else
                {
                        if (!empty($new_subdir))
                        {
                                if (!empty($cur_subdir))
                                {
                                        $cur_subdir = $cur_subdir."/".$new_subdir;
                                }
                                else
                                {
                                        $cur_subdir = $new_subdir;
                                }
                        }
                }

                $cur_subdir = str_replace("..", "", $cur_subdir);
                $cur_dir = (!empty($cur_subdir))
                        ? $this->main_dir."/".$cur_subdir
                        : $this->main_dir;

                $this->ctrl->setParameter($this, "cdir", $cur_subdir);
                
                // toolbar for adding files/directories
                $ilToolbar->setFormAction($ilCtrl->getFormAction($this), true);
                include_once("./Services/Form/classes/class.ilTextInputGUI.php");
                
                if ($this->getAllowDirectories() && $this->getAllowDirectoryCreation())
                {
                        $ti = new ilTextInputGUI($this->lng->txt("cont_new_dir"), "new_dir");
                        $ti->setMaxLength(80);
                        $ti->setSize(10);
                        $ilToolbar->addInputItem($ti, true);
                        $ilToolbar->addFormButton($lng->txt("create"), "createDirectory");
                        
                        $ilToolbar->addSeparator();
                }
                
                include_once("./Services/Form/classes/class.ilFileInputGUI.php");
                if ($this->getAllowFileCreation())
                {
                        $fi = new ilFileInputGUI($this->lng->txt("cont_new_file"), "new_file");
                        $fi->setSize(10);
                        $ilToolbar->addInputItem($fi, true);
                        $ilToolbar->addFormButton($lng->txt("upload"), "uploadFile");
                }
                
                include_once 'Services/FileSystem/classes/class.ilUploadFiles.php';
                if (ilUploadFiles::_getUploadDirectory() && $this->getAllowFileCreation() && $this->getUseUploadDirectory())
                {
                        $ilToolbar->addSeparator();
                        $files = ilUploadFiles::_getUploadFiles();
                        $options[""] = $lng->txt("cont_select_from_upload_dir"); 
                        foreach($files as $file)
                        {
                                $file = htmlspecialchars($file, ENT_QUOTES, "utf-8");
                                $options[$file] = $file;
                        }
                        include_once("./Services/Form/classes/class.ilSelectInputGUI.php");
                        $si = new ilSelectInputGUI($this->lng->txt("cont_uploaded_file"), "uploaded_file");
                        $si->setOptions($options);
                        $ilToolbar->addInputItem($si, true);
                        $ilToolbar->addFormButton($lng->txt("copy"), "uploadFile");
                }
                        
                // load files templates
                include_once("./Services/FileSystem/classes/class.ilFileSystemTableGUI.php");
                $fs_table = new ilFileSystemTableGUI($this, "listFiles", $cur_dir, $cur_subdir,
                        $this->label_enable, $this->file_labels, $this->label_header, $this->commands,
                        $this->getPostDirPath(), $this->getTableId());
                if ($this->getTitle() != "")
                {
                        $fs_table->setTitle($this->getTitle());
                }
                if ($_GET["resetoffset"] == 1)
                {
                        $fs_table->resetOffset();
                }
                $this->tpl->setContent($fs_table->getHTML());
        }

        function renameFileForm()
        {
                global $lng, $ilCtrl;
                
                if (!isset($_POST["file"]))
                {
                        $this->ilias->raiseError($this->lng->txt("no_checkbox"),$this->ilias->error_obj->MESSAGE);
                }

                if (count($_POST["file"]) > 1)
                {
                        $this->ilias->raiseError($this->lng->txt("cont_select_max_one_item"),$this->ilias->error_obj->MESSAGE);
                }

                if (ilUtil::stripSlashes($_POST["file"][0]) == ".." )
                {
                        $this->ilias->raiseError($this->lng->txt("select_a_file"),$this->ilias->error_obj->MESSAGE);
                }

                $cur_subdir = str_replace(".", "", ilUtil::stripSlashes($_GET["cdir"]));
                $file = (!empty($cur_subdir))
                        ? $this->main_dir."/".$cur_subdir."/".ilUtil::stripSlashes($_POST["file"][0])
                        : $this->main_dir."/".ilUtil::stripSlashes($_POST["file"][0]);

                $this->ctrl->setParameter($this, "old_name", ilUtil::stripSlashes($_POST["file"][0]));
                        
                include_once("Services/Form/classes/class.ilPropertyFormGUI.php");
                $form = new ilPropertyFormGUI();
                
                // file/dir name
                $ti = new ilTextInputGUI($this->lng->txt("name"), "new_name");
                $ti->setMaxLength(200);
                $ti->setSize(40);
                $ti->setValue(ilUtil::stripSlashes($_POST["file"][0]));
                $form->addItem($ti);
                
                // save and cancel commands
                $form->addCommandButton("renameFile", $lng->txt("rename"));
                $form->addCommandButton("cancelRename", $lng->txt("cancel"));
                $form->setFormAction($ilCtrl->getFormAction($this, "renameFile"));

                if (@is_dir($file))
                {
                        $form->setTitle($this->lng->txt("cont_rename_dir"));
                }
                else
                {
                        $form->setTitle($this->lng->txt("rename_file"));
                }
                
                $this->tpl->setContent($form->getHTML());
        }

        function renameFile()
        {
                global $lng;
                
                $new_name = str_replace("..", "", ilUtil::stripSlashes($_POST["new_name"]));
                $new_name = str_replace("/", "", $new_name);
                if ($new_name == "")
                {
                        $this->ilias->raiseError($this->lng->txt("enter_new_name"),$this->ilias->error_obj->MESSAGE);
                }

                $pi = pathinfo($new_name);
                $suffix = $pi["extension"];
                if ($suffix != "" && !$this->isValidSuffix($suffix))
                {
                        ilUtil::sendFailure($this->lng->txt("file_no_valid_file_type")." ($suffix)", true);
                        $this->ctrl->redirect($this, "listFiles");
                }

                $cur_subdir = str_replace(".", "", ilUtil::stripSlashes($_GET["cdir"]));
                $dir = (!empty($cur_subdir))
                        ? $this->main_dir."/".$cur_subdir."/"
                        : $this->main_dir."/";

                rename($dir.ilUtil::stripSlashes($_GET["old_name"]), $dir.$new_name);

                ilUtil::renameExecutables($this->main_dir);
                if (@is_dir($dir.$new_name))
                {
                        ilUtil::sendSuccess($lng->txt("cont_dir_renamed"), true);
                        $this->setPerformedCommand("rename_dir", array("old_name" => $_GET["old_name"],
                                "new_name" => $new_name));
                }
                else
                {
                        ilUtil::sendSuccess($lng->txt("cont_file_renamed"), true);
                        $this->setPerformedCommand("rename_file", array("old_name" => $_GET["old_name"],
                                "new_name" => $new_name));
                }
                $this->ctrl->redirect($this, "listFiles");
        }

        function cancelRename()
        {
                $this->ctrl->redirect($this, "listFiles");
        }

        function createDirectory()
        {
                global $lng;
                
                // determine directory
                $cur_subdir = str_replace(".", "", ilUtil::stripSlashes($_GET["cdir"]));
                $cur_dir = (!empty($cur_subdir))
                        ? $this->main_dir."/".$cur_subdir
                        : $this->main_dir;

                $new_dir = str_replace(".", "", ilUtil::stripSlashes($_POST["new_dir"]));
                $new_dir = str_replace("/", "", $new_dir);

                if (!empty($new_dir))
                {
                        ilUtil::makeDir($cur_dir."/".$new_dir);
                        if (is_dir($cur_dir."/".$new_dir))
                        {
                                ilUtil::sendSuccess($lng->txt("cont_dir_created"), true);
                                $this->setPerformedCommand("create_dir", array("name" => $new_dir));
                        }
                }
                else
                {
                        ilUtil::sendFailure($lng->txt("cont_enter_a_dir_name"), true);
                }
                $this->ctrl->saveParameter($this, "cdir");
                $this->ctrl->redirect($this, "listFiles");
        }

        function uploadFile()
        {
                global $lng;
                
                // determine directory
                $cur_subdir = str_replace(".", "", ilUtil::stripSlashes($_GET["cdir"]));
                $cur_dir = (!empty($cur_subdir))
                        ? $this->main_dir."/".$cur_subdir
                        : $this->main_dir;

                $tgt_file = null;

                $pi = pathinfo($_FILES["new_file"]["name"]);
                $suffix = $pi["extension"];
                if (!$this->isValidSuffix($suffix))
                {
                        ilUtil::sendFailure($this->lng->txt("file_no_valid_file_type")." ($suffix)", true);
                        $this->ctrl->redirect($this, "listFiles");
                }

                if (is_file($_FILES["new_file"]["tmp_name"]))
                {
                        $tgt_file = $cur_dir."/".ilUtil::stripSlashes($_FILES["new_file"]["name"]);
                        
                        move_uploaded_file($_FILES["new_file"]["tmp_name"], $tgt_file);
                        
                }
                elseif ($_POST["uploaded_file"])
                {                                       
                        include_once 'Services/FileSystem/classes/class.ilUploadFiles.php';

                        // check if the file is in the ftp directory and readable
                        if (ilUploadFiles::_checkUploadFile($_POST["uploaded_file"]))
                        {
                                $tgt_file = $cur_dir."/".ilUtil::stripSlashes($_POST["uploaded_file"]);                 
                                
                                // copy uploaded file to data directory
                                ilUploadFiles::_copyUploadFile($_POST["uploaded_file"], $tgt_file);
                        }                       
                }
                else if (trim($_FILES["new_file"]["name"]) == "")
                {
                        ilUtil::sendFailure($lng->txt("cont_enter_a_file"), true);
                }
                
                if($tgt_file && is_file($tgt_file))
                {                       
                        $unzip = null;
                        
                        // extract zip?                                         
                        include_once("./Services/Utilities/classes/class.ilMimeTypeUtil.php");                                  
                        if(ilMimeTypeUtil::getMimeType($tgt_file) == "application/zip")
                        {
                                $this->ctrl->setParameter($this, "upfile", basename($tgt_file));
                                $url = $this->ctrl->getLinkTarget($this, "unzipFile");
                                $this->ctrl->setParameter($this, "upfile", "");
                                
                                include_once "Services/UIComponent/Button/classes/class.ilLinkButton.php";
                                $unzip = ilLinkButton::getInstance();
                                $unzip->setCaption("unzip");
                                $unzip->setUrl($url);
                                $unzip = " ".$unzip->render();
                        }
                        
                        ilUtil::sendSuccess($lng->txt("cont_file_created").$unzip, true);
                        
                        $this->setPerformedCommand("create_file",
                                array("name" => substr($tgt_file, strlen($this->main_dir)+1)));         
                }

                $this->ctrl->saveParameter($this, "cdir");

                ilUtil::renameExecutables($this->main_dir);

                $this->ctrl->redirect($this, "listFiles");
        }

        function confirmDeleteFile()
        {
                global $ilCtrl, $tpl, $lng;

                if (!is_array($_POST["file"]) || count($_POST["file"]) == 0)
                {
                        ilUtil::sendFailure($lng->txt("no_checkbox"), true);
                        $ilCtrl->redirect($this, "listFile");
                }
                else
                {
                        include_once("./Services/Utilities/classes/class.ilConfirmationGUI.php");
                        $cgui = new ilConfirmationGUI();
                        $cgui->setFormAction($ilCtrl->getFormAction($this));
                        $cgui->setHeaderText($lng->txt("info_delete_sure"));
                        $cgui->setCancel($lng->txt("cancel"), "listFiles");
                        $cgui->setConfirm($lng->txt("delete"), "deleteFile");
                        
                        foreach ($_POST["file"] as $i)
                        {
                                $cgui->addItem("file[]", $i, $i);
                        }
                        
                        $tpl->setContent($cgui->getHTML());
                }
        }
        
        function deleteFile()
        {
                global $lng;

                if (!isset($_POST["file"]))
                {
                        $this->ilias->raiseError($this->lng->txt("no_checkbox"),$this->ilias->error_obj->MESSAGE);
                }
                
                foreach ($_POST["file"] as $post_file)
                {
                        if (ilUtil::stripSlashes($post_file) == "..")
                        {
                                $this->ilias->raiseError($this->lng->txt("no_checkbox"),$this->ilias->error_obj->MESSAGE);
                                break;
                        }

                        $cur_subdir = str_replace(".", "", ilUtil::stripSlashes($_GET["cdir"]));
                        $cur_dir = (!empty($cur_subdir))
                                ? $this->main_dir."/".$cur_subdir
                                : $this->main_dir;
                        $file = $cur_dir."/".ilUtil::stripSlashes($post_file);

                        if (@is_file($file))
                        {
                                unlink($file);
                        }

                        if (@is_dir($file))
                        {
                                $is_dir = true;
                                ilUtil::delDir($file);
                        }
                }

                $this->ctrl->saveParameter($this, "cdir");
                if ($is_dir)
                {
                        ilUtil::sendSuccess($lng->txt("cont_dir_deleted"), true);
                        $this->setPerformedCommand("delete_dir",
                                array("name" => ilUtil::stripSlashes($post_file)));
                }
                else
                {
                        ilUtil::sendSuccess($lng->txt("cont_file_deleted"), true);
                        $this->setPerformedCommand("delete_file",
                                array("name" => ilUtil::stripSlashes($post_file)));
                }
                $this->ctrl->redirect($this, "listFiles");
        }

        function unzipFile()
        {
                global $lng;
                
                if (isset($_GET["upfile"]))
                {
                        $file = basename($_GET["upfile"]);
                }
                else
                {                       
                        if (!isset($_POST["file"]))
                        {
                                $this->ilias->raiseError($this->lng->txt("no_checkbox"),$this->ilias->error_obj->MESSAGE);
                        }

                        if (count($_POST["file"]) > 1)
                        {
                                $this->ilias->raiseError($this->lng->txt("cont_select_max_one_item"),$this->ilias->error_obj->MESSAGE);
                        }
                        
                        $file = basename($_POST["file"][0]);                    
                }

                $cur_subdir = str_replace(".", "", ilUtil::stripSlashes($_GET["cdir"]));
                $cur_dir = (!empty($cur_subdir))
                        ? $this->main_dir."/".$cur_subdir
                        : $this->main_dir;
                $file = $cur_dir."/".ilUtil::stripSlashes($file);

                if (@is_file($file))
                {
                        include_once("./Services/Utilities/classes/class.ilFileUtils.php");
                        $cur_files = array_keys(ilUtil::getDir($cur_dir));
                        $cur_files_r = iterator_to_array(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($cur_dir)));
                        
                        if ($this->getAllowDirectories())
                        {
                                ilUtil::unzip($file, true);
                        }
                        else
                        {
                                ilUtil::unzip($file, true, true);
                        }
                        
                        $new_files = array_keys(ilUtil::getDir($cur_dir));
                        $new_files_r = iterator_to_array(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($cur_dir)));

                        $diff = array_diff($new_files, $cur_files);
                        $diff_r = array_diff($new_files_r, $cur_files_r);

                        // unlink forbidden file types
                        foreach ($diff_r as $f => $d)
                        {
                                $pi = pathinfo($f);
                                if (!is_dir($f) && !$this->isValidSuffix(strtolower($pi["extension"])))
                                {
                                        ilUtil::sendFailure($lng->txt("file_some_invalid_file_types_removed")." (".$pi["extension"].")", true);
                                        unlink($f);
                                }
                        }

                        if(sizeof($diff))
                        {
                                if ($this->getAllowDirectories())
                                {
                                        include_once("./Services/Utilities/classes/class.ilFileUtils.php");
                                        $new_files = array();
                                        
                                        foreach($diff as $new_item)
                                        {
                                                if(is_dir($cur_dir."/".$new_item))
                                                {
                                                        ilFileUtils::recursive_dirscan($cur_dir."/".$new_item, $new_files);
                                                }
                                        }
                                        
                                        if(is_array($new_files["path"]))
                                        {                                               
                                                foreach($new_files["path"] as $idx => $path)
                                                {
                                                        $path = substr($path, strlen($this->main_dir)+1);
                                                        $diff[] = $path.$new_files["file"][$idx];                                                       
                                                }
                                        }                                       
                                }
                                
                                $this->setPerformedCommand("unzip_file",
                                        array("name" => substr($file, strlen($this->main_dir)+1),                                               
                                                "added" => $diff));
                        }
                }

                ilUtil::renameExecutables($this->main_dir);

                $this->ctrl->saveParameter($this, "cdir");
                ilUtil::sendSuccess($lng->txt("cont_file_unzipped"), true);
                $this->ctrl->redirect($this, "listFiles");
        }

        function downloadFile()
        {
                if (!isset($_POST["file"]))
                {
                        $this->ilias->raiseError($this->lng->txt("no_checkbox"),$this->ilias->error_obj->MESSAGE);
                }

                if (count($_POST["file"]) > 1)
                {
                        $this->ilias->raiseError($this->lng->txt("cont_select_max_one_item"),$this->ilias->error_obj->MESSAGE);
                }

                $cur_subdir = str_replace(".", "", ilUtil::stripSlashes($_GET["cdir"]));
                $cur_dir = (!empty($cur_subdir))
                        ? $this->main_dir."/".$cur_subdir
                        : $this->main_dir;
                $file = $cur_dir."/".$_POST["file"][0];
                
                // validate against files of current directory
                $valid = false;
                foreach(ilUtil::getDir($cur_dir) as $entry)
                {
                        if($entry["type"] == "file" &&
                                $cur_dir."/".$entry["entry"] == $file)
                        {
                                $valid = true;
                                break;
                        }
                }
                
                if (@is_file($file) && !(@is_dir($file)) && $valid)
                {
                        ilUtil::deliverFile($file, $_POST["file"][0]);
                        exit;
                }
                else
                {
                        $this->ctrl->saveParameter($this, "cdir");
                        $this->ctrl->redirect($this, "listFiles");
                }
        }

        function getTabs(&$tabs_gui)
        {
                global $ilCtrl;
                
                $ilCtrl->setParameter($this, "resetoffset", 1);
                $tabs_gui->addTarget("cont_list_files",
                        $this->ctrl->getLinkTarget($this, "listFiles"), "listFiles",
                        get_class($this));
                $ilCtrl->setParameter($this, "resetoffset", "");
        }

}
?>