classes/class.ilFileDataExercise.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/


require_once("classes/class.ilFileData.php");
                                
class ilFileDataExercise extends ilFileData
{
        var $obj_id;

        var $exercise_path;

        function ilFileDataExercise($a_obj_id = 0)
        {
                define('EXERCISE_PATH','exercise');
                parent::ilFileData();
                $this->exercise_path = parent::getPath()."/".EXERCISE_PATH;
                
                // IF DIRECTORY ISN'T CREATED CREATE IT
                if(!$this->__checkPath())
                {
                        $this->__initDirectory();
                }
                $this->obj_id = $a_obj_id;
        }

        function getObjId()
        {
                return $this->obj_id;
        }

        function getExercisePath()
        {
                return $this->exercise_path;
        }

        function getFiles()
        {
                $files = array();
                $dp = opendir($this->exercise_path);

                while($file = readdir($dp))
                {
                        if(is_dir($file))
                        {
                                continue;
                        }
                        list($obj_id,$rest) = split('_',$file,2);
                        if($obj_id == $this->obj_id)
                        {
                                if(!is_dir($this->exercise_path.'/'.$file))
                                {
                                        $files[] = array(
                                                'name'     => $rest,
                                                'size'     => filesize($this->exercise_path.'/'.$file),
                                                'ctime'    => ilFormat::formatDate(date('Y-m-d H:i:s',filectime($this->exercise_path.'/'.$file))));
                                }
                        }
                }
                closedir($dp);
                return $files;
        }

        function ilClone($a_new_obj_id)
        {
                foreach($this->getFiles() as $file)
                {
                        @copy($this->getExercisePath()."/".$this->obj_id.'_'.$file["name"],
                                  $this->getExercisePath()."/".$a_new_obj_id.'_'.$file["name"]);
                }
                return true;
        }
        function delete()
        {
                foreach($this->getFiles() as $file)
                {
                        $this->unlinkFile($file["name"]);
                }
                
                $delivered_file_path = $this->getExercisePath() . "/" . $this->obj_id . "/";
                if (is_dir($delivered_file_path))
                {
                        system("rm -rf " . ilUtil::escapeShellArg($delivered_file_path));
                }
                
                return true;
        }

        function storeUploadedFile($a_http_post_file, $secure_filename = false)
        {
                // TODO: 
                // CHECK UPLOAD LIMIT
                // 
                $filename = $a_http_post_file['name'];
                if ($secure_filename)
                {
                        // replace whitespaces with underscores
                        $filename = preg_replace("/\s/", "_", $filename);
                        // remove all special characters
                        $filename = preg_replace("/[^_a-zA-Z0-9\.]/", "", $filename);
                }
                if(isset($a_http_post_file) && $a_http_post_file['size'])
                {
                        // CHECK IF FILE WITH SAME NAME EXISTS
                        $this->__rotateFiles($this->getExercisePath().'/'.$this->obj_id.'_'.$filename);
                        //move_uploaded_file($a_http_post_file['tmp_name'],$this->getExercisePath().'/'.$this->obj_id.'_'.
                        //                                 $filename);
                        ilUtil::moveUploadedFile($a_http_post_file['tmp_name'], $a_http_post_file['name'],
                                $this->getExercisePath().'/'.$this->obj_id.'_'.$filename);

                }
                return true;
        }

        function deliverFile($a_http_post_file, $user_id)
        {
                // TODO: 
                // CHECK UPLOAD LIMIT
                // 
                $result = false;
                if(isset($a_http_post_file) && $a_http_post_file['size'])
                {
                        $filename = $a_http_post_file['name'];
                        // replace whitespaces with underscores
                        $filename = preg_replace("/\s/", "_", $filename);
                        // remove all special characters
                        $filename = preg_replace("/[^_a-zA-Z0-9\.]/", "", $filename);

                        if(!is_dir($savepath = $this->getExercisePath()."/".$this->obj_id))
                        {
                                ilUtil::makeDir($savepath);
                        }
                        $savepath .= '/' .$user_id;
                        if(!is_dir($savepath))
                        {
                                ilUtil::makeDir($savepath);
                        }                               

                        // CHECK IF FILE PATH EXISTS
                        if (!is_dir($savepath))
                        {
                                require_once "./classes/class.ilUtil.php";
                                #ilUtil::makeDirParents($savepath);
                                ilUtil::makeDir($savepath);
                        }
                        $now = getdate();
                        $prefix = sprintf("%04d%02d%02d%02d%02d%02d", $now["year"], $now["mon"], $now["mday"], $now["hours"], 
                                                          $now["minutes"], $now["seconds"]);
                        //move_uploaded_file($a_http_post_file["tmp_name"], $savepath . $prefix . "_" . $filename);
                        ilUtil::moveUploadedFile($a_http_post_file["tmp_name"], $a_http_post_file["name"],
                                $savepath . "/" . $prefix . "_" . $filename);
                        require_once "./content/classes/Media/class.ilObjMediaObject.php";
                        $result = array(
                                "filename" => $prefix . "_" . $filename,
                                "fullname" => $savepath . "/" . $prefix . "_" . $filename,
                                "mimetype" =>   ilObjMediaObject::getMimeType($savepath . "/" . $prefix . "_" . $filename)
                        );
                }
                return $result;
        }
        
        function downloadAllDeliveredFiles($members)
        {
                require_once "./classes/class.ilUtil.php";
                global $lng;
                
                ksort($members);
                $tmpfile = ilUtil::ilTempnam();
                $fh = fopen($tmpfile, "w");
                if ($fh)
                {
                        foreach ($members as $id => $member)
                        {
                                fwrite($fh, "$id\t$member\n");
                        }
                        fclose($fh);
                }
                $savepath = $this->getExercisePath() . "/" . $this->obj_id . "/";
                copy($tmpfile, $savepath . "users.txt"); 
                $cdir = getcwd();

                // important check: if the directory does not exist
                // ILIAS stays in the current directory (echoing only a warning)
                // and the zip command below archives the whole ILIAS directory
                // (including the data directory) and sends a mega file to the user :-o
                if (!is_dir($savepath))
                {
                        return;
                }
                chdir($savepath);
                $zip = PATH_TO_ZIP;
                $tmpfile = ilUtil::ilTempnam();
                $tmpzipfile = $tmpfile . ".zip";
                $zipcmd = $zip." -r ".ilUtil::escapeShellArg($tmpzipfile)." *";
                exec($zipcmd);
                ilUtil::deliverFile($tmpzipfile, strtolower($lng->txt("excs")) . ".zip");
                chdir($cdir);
                unlink($savepath . "users.txt");
                unlink($tmpfile);
                unlink($tmpzipfile);
        }
        
        function unlinkFiles($a_filenames)
        {
                if(is_array($a_filenames))
                {
                        foreach($a_filenames as $file)
                        {
                                if(!$this->unlinkFile($file))
                                {
                                        return $file;
                                }
                        }
                }
                return '';
        }
        function unlinkFile($a_filename)
        {
                if(file_exists($this->exercise_path.'/'.$this->obj_id.'_'.$a_filename))
                {
                        return unlink($this->exercise_path.'/'.$this->obj_id.'_'.$a_filename);
                }
        }
        function getAbsolutePath($a_path)
        {
                return $this->exercise_path.'/'.$this->obj_id.'_'.$a_path;
        }

        function checkFilesExist($a_files)
        {
                if($a_files)
                {
                        foreach($a_files as $file)
                        {
                                if(!file_exists($this->exercise_path.'/'.$this->obj_id.'_'.$file))
                                {
                                        return false;
                                }
                        }
                        return true;
                }
                return true;
        }

        // PRIVATE METHODS
        function __checkPath()
        {
                if(!@file_exists($this->getExercisePath()))
                {
                        return false;
                }
                $this->__checkReadWrite();

                return true;
        }
        function __checkReadWrite()
        {
                if(is_writable($this->exercise_path) && is_readable($this->exercise_path))
                {
                        return true;
                }
                else
                {
                        $this->ilias->raiseError("Exercise directory is not readable/writable by webserver",$this->ilias->error_obj->FATAL);
                }
        }
        function __initDirectory()
        {
                if(is_writable($this->getPath()))
                {
                        return ilUtil::makeDir($this->excercise_path = $this->getPath().'/'.EXERCISE_PATH);
                }
                return false;
        }
        function __rotateFiles($a_path)
        {
                if(file_exists($a_path))
                {
                        $this->__rotateFiles($a_path.".old");
                        return rename($a_path,$a_path.'.old');
                }
                return true;
        }
}