class.ilExSubmission.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */
 
class ilExSubmission
{       
        protected $assignment; // [ilExAssignment]
        protected $user_id; // [int]
        protected $team; // [ilExAssignmentTeam]
        protected $peer_review; // [ilExPeerReview]
        protected $is_tutor; // [bool]
        protected $public_submissions; // [bool]
        
        public function __construct(ilExAssignment $a_ass, $a_user_id, ilExAssignmentTeam $a_team = null, $a_is_tutor = false, $a_public_submissions = false)
        {                               
                global $ilUser;
                
                $this->assignment = $a_ass;
                $this->user_id = $a_user_id;    
                $this->is_tutor = (bool)$a_is_tutor;
                $this->public_submissions = (bool)$a_public_submissions;
                
                if($a_ass->hasTeam())
                {
                        if(!$a_team)
                        {
                                include_once "Modules/Exercise/classes/class.ilExAssignmentTeam.php";
                                $this->team = ilExAssignmentTeam::getInstanceByUserId($this->assignment->getId(), $this->user_id);
                        }
                        else
                        {
                                $this->team = $a_team;
                        }
                }
                
                if($this->assignment->getPeerReview())
                {
                        include_once "Modules/Exercise/classes/class.ilExPeerReview.php";
                        $this->peer_review = new ilExPeerReview($this->assignment);
                }
        }
                
        public function getSubmissionType()
        {
                switch($this->assignment->getType())
                {
                        case ilExAssignment::TYPE_UPLOAD_TEAM:                                  
                        case ilExAssignment::TYPE_UPLOAD:               
                                return "File";
 
                        case ilExAssignment::TYPE_BLOG:                 
                        case ilExAssignment::TYPE_PORTFOLIO:                            
                                return "Object";        
 
                        case ilExAssignment::TYPE_TEXT:                                                                                         
                                return "Text";  
                };
        }
        
        
        public function getAssignment()
        {
                return $this->assignment;
        }
        
        public function getTeam()
        {
                return $this->team;
        }
        
        public function getPeerReview()
        {
                return $this->peer_review;
        }
        
        public function validatePeerReviews()
        {
                $res = array();                         
                foreach($this->getUserIds() as $user_id)
                {                                       
                        $valid = true;
                        
                        // no peer review == valid
                        if($this->peer_review)
                        {
                                $valid = $this->peer_review->isFeedbackValidForPassed($user_id);
                        }
                        
                        $res[$user_id] = $valid;
                }
                return $res;
        }
        
        public function getUserId()
        {
                return $this->user_id;
        }
        
        public function getUserIds()
        {
                if($this->team && 
                        !$this->hasNoTeamYet())
                {                       
                        return $this->team->getMembers();
                }
                
                // if has no team currently there still might be uploads attached
                return array($this->user_id);           
        }
        
        public function getFeedbackId()
        {
                if($this->team)
                {
                        return "t".$this->team->getId();
                }
                else
                {
                        return $this->getUserId();
                }
        }
 
        public function hasSubmitted()
        {
                return (bool)sizeof($this->getFiles(null, true));
        }               
        
        public function getSelectedObject()
        {
                $files = $this->getFiles();
                if(sizeof($files))              
                {
                        return array_pop($files);
                }
        }
        
        public function canSubmit()
        {
                return ($this->isOwner() &&
                        !$this->assignment->notStartedYet() &&
                        $this->assignment->beforeDeadline());
        }
        
        public function canView()
        {
                global $ilUser;
                
                if($this->canSubmit() ||
                        $this->isTutor() ||
                        $this->isInTeam() ||
                        $this->public_submissions)
                {
                        return true;
                }
                                
                // #16115
                if($this->peer_review)
                {
                        // peer review givers may view peer submissions
                        foreach($this->peer_review->getPeerReviewsByPeerId($this->getUserId()) as $giver)
                        {
                                if($giver["giver_id"] == $ilUser->getId())
                                {
                                        return true;
                                }
                        }
                }
                
                return false;
        }
        
        public function isTutor()
        {
                return $this->is_tutor;
        }
        
        public function hasNoTeamYet()
        {
                if($this->assignment->hasTeam() &&
                        !$this->team->getId())
                {
                        return true;
                }
                return false;
        }
        
        public function isInTeam($a_user_id = null)
        {
                global $ilUser;
                
                if(!$a_user_id)
                {
                        $a_user_id = $ilUser->getId();
                }
                return in_array($a_user_id, $this->getUserIds());
        }       
        
        public function isOwner()
        {               
                global $ilUser;         
                
                return ($ilUser->getId() == $this->getUserId());
        }       
        
        public function hasPeerReviewAccess()
        {
                return ($this->peer_review &&
                        $this->peer_review->hasPeerReviewAccess($this->user_id));
        }
        
        public function canAddFile()
        {
                if(!$this->canSubmit())
                {
                        return false;
                }
                
                $max = $this->getAssignment()->getMaxFile();
                if($max &&
                        $max <= sizeof($this->getFiles()))
                {
                        return false;
                }       
                
                return true;
        }
        
        
        //
        // FILES
        //
        
        protected function isLate()
        {
                $dl = $this->assignment->getPersonalDeadline($this->getUserId());               
                return ($dl && $dl < time());           
        }
        
        protected function initStorage()
        {
                include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
                return new ilFSStorageExercise($this->assignment->getExerciseId(), $this->assignment->getId());
        }
        
        function uploadFile($a_http_post_files, $unzip = false)
        {
                global $ilDB;
                
                if(!$this->canAddFile())
                {
                        return false;
                }
                        
                $deliver_result = $this->initStorage()->uploadFile($a_http_post_files, $this->getUserId(), $unzip);
 
                if ($deliver_result)
                {                       
                        $next_id = $ilDB->nextId("exc_returned");
                        $query = sprintf("INSERT INTO exc_returned ".
                                                         "(returned_id, obj_id, user_id, filename, filetitle, mimetype, ts, ass_id, late) ".
                                                         "VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s)",
                                $ilDB->quote($next_id, "integer"),
                                $ilDB->quote($this->assignment->getExerciseId(), "integer"),
                                $ilDB->quote($this->getUserId(), "integer"),
                                $ilDB->quote($deliver_result["fullname"], "text"),
                                $ilDB->quote(ilFileUtils::getValidFilename($a_http_post_files["name"]), "text"),
                                $ilDB->quote($deliver_result["mimetype"], "text"),
                                $ilDB->quote(ilUtil::now(), "timestamp"),
                                $ilDB->quote($this->assignment->getId(), "integer"),
                                $ilDB->quote($this->isLate(), "integer")
                        );
                        $ilDB->manipulate($query);
                
                        if($this->team)
                        {                               
                                $this->team->writeLog(ilExAssignmentTeam::TEAM_LOG_ADD_FILE, 
                                        $a_http_post_files["name"]);                    
                        }                       
                        
                        return true;
                }               
        }
        
        function processUploadedZipFile($fileTmp)
        {               
                global $lng; 
                
                // Create unzip-directory
                $newDir = ilUtil::ilTempnam();
                ilUtil::makeDir($newDir);
 
                include_once ("Services/Utilities/classes/class.ilFileUtils.php");
                
                $success = true;
                
                try 
                {
                        ilFileUtils::processZipFile($newDir,$fileTmp, false);
                        ilFileUtils::recursive_dirscan($newDir, $filearray);                    
 
                        // #18441 - check number of files in zip
                        $max_num = $this->assignment->getMaxFile();
                        if($max_num)
                        {
                                $current_num = sizeof($this->getFiles());
                                $zip_num = sizeof($filearray["file"]);
                                if($current_num + $zip_num > $max_num)
                                {
                                        $success = false;
                                        ilUtil::sendFailure($lng->txt("exc_upload_error"), true);
                                }
                        }
                        
                        if($success)
                        {                       
                                foreach ($filearray["file"] as $key => $filename)
                                {
                                        $a_http_post_files["name"] = ilFileUtils::utf8_encode($filename);
                                        $a_http_post_files["type"] = "other";
                                        $a_http_post_files["tmp_name"] = $filearray["path"][$key]."/".$filename;
                                        $a_http_post_files["error"] = 0;
                                        $a_http_post_files["size"] = filesize($filearray["path"][$key]."/".$filename);
 
                                        if(!$this->uploadFile($a_http_post_files, true))
                                        {
                                                $success = false;
                                                ilUtil::sendFailure($lng->txt("exc_upload_error"), true);
                                        }               
                                }                       
                        }
                } 
                catch (ilFileUtilsException $e) 
                {
                        $success = false;
                        ilUtil::sendFailure($e->getMessage());
                }
                
                ilUtil::delDir($newDir);
                return $success;
        }
        
        public static function hasAnySubmissions($a_ass_id)
        {
                global $ilDB;
                
                $query = "SELECT * FROM exc_returned".
                        " WHERE ass_id = ".$ilDB->quote($a_ass_id, "integer").
                        " AND (filename IS NOT NULL OR atext IS NOT NULL)".
                        " AND ts IS NOT NULL";
                $res = $ilDB->query($query);
                return $res->numRows($res);
        }
        
        public static function getAllAssignmentFiles($a_exc_id, $a_ass_id)
        {
                global $ilDB;
                
                include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
                $storage = new ilFSStorageExercise($a_exc_id, $a_ass_id);
                $path = $storage->getAbsoluteSubmissionPath();
                
                $query = "SELECT * FROM exc_returned WHERE ass_id = ".
                        $ilDB->quote($a_ass_id, "integer");
 
                $res = $ilDB->query($query);
                while($row = $ilDB->fetchAssoc($res))
                {
                        $row["timestamp"] = $row["ts"];
                        $row["filename"] = $path."/".$row["user_id"]."/".basename($row["filename"]);
                        $delivered[] = $row;
                }
                
                return $delivered ? $delivered : array();
        }
 
        function getFiles(array $a_file_ids = null, $a_only_valid = false, $a_min_timestamp = null)
        {
                global $ilDB;
                
                $sql = "SELECT * FROM exc_returned".
                        " WHERE ass_id = ".$ilDB->quote($this->getAssignment()->getId(), "integer").
                        " AND ".$ilDB->in("user_id", $this->getUserIds(), "", "integer");
                
                if($a_file_ids)
                {
                        $sql .= " AND ".$ilDB->in("returned_id", $a_file_ids, false, "integer");
                }
                
                if($a_min_timestamp)
                {
                        $sql .= " AND ts > ".$ilDB->quote($a_min_timestamp, "timestamp");
                }       
                
                $result = $ilDB->query($sql);
                
                $delivered_files = array();
                if ($ilDB->numRows($result))
                {
                        $path = $this->initStorage()->getAbsoluteSubmissionPath();
                
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                // blog/portfolio/text submissions
                                if($a_only_valid && 
                                        !$row["filename"] &&
                                        !(trim($row["atext"])))
                                {
                                        continue;
                                }
                                
                                $row["owner_id"] = $row["user_id"];
                                $row["timestamp"] = $row["ts"];
                                $row["timestamp14"] = substr($row["ts"], 0, 4).
                                        substr($row["ts"], 5, 2).substr($row["ts"], 8, 2).
                                        substr($row["ts"], 11, 2).substr($row["ts"], 14, 2).
                                        substr($row["ts"], 17, 2);
                                $row["filename"] = $path.
                                        "/".$row["user_id"]."/".basename($row["filename"]);
 
                                // see 22301, 22719
                                if (is_file($row["filename"]) || (!in_array($this->assignment->getType(),
                                                array(ilExAssignment::TYPE_UPLOAD, ilExAssignment::TYPE_UPLOAD_TEAM))))
                                {
                                        array_push($delivered_files, $row);
                                }
                        }
                }
                                
                return $delivered_files;
        }
                
        function lookupNewFiles()
        {
                global $ilDB, $ilUser;
                
                $q = "SELECT exc_returned.returned_id AS id ".
                        "FROM exc_usr_tutor, exc_returned ".
                        "WHERE exc_returned.ass_id = exc_usr_tutor.ass_id ".
                        " AND exc_returned.user_id = exc_usr_tutor.usr_id ".
                        " AND exc_returned.ass_id = ".$ilDB->quote($this->getAssignment()->getId(), "integer").
                        " AND ".$ilDB->in("exc_returned.user_id", $this->getUserIds(), "", "integer").
                        " AND exc_usr_tutor.tutor_id = ".$ilDB->quote($ilUser->getId(), "integer").
                        " AND exc_usr_tutor.download_time < exc_returned.ts ";
 
                $new_up_set = $ilDB->query($q);
 
                $new_up = array();
                while ($new_up_rec = $ilDB->fetchAssoc($new_up_set))
                {
                        $new_up[] = $new_up_rec["id"];
                }
 
                return $new_up;
        }
        
        public static function lookupExerciseIdForReturnedId($a_returned_id)
        {
                global $ilDB;
                
                $set = $ilDB->query("SELECT obj_id".
                        " FROM exc_returned".
                        " WHERE returned_id = ".$ilDB->quote($a_returned_id, "integer"));
                $row = $ilDB->fetchAssoc($set);
                return (int)$row["obj_id"];             
        }
        
        public static function findUserFiles($a_user_id, $a_filetitle)
        {
                global $ilDB;
                
                $set = $ilDB->query("SELECT obj_id, ass_id".
                        " FROM exc_returned".
                        " WHERE user_id = ".$ilDB->quote($a_user_id, "integer").
                        " AND filetitle = ".$ilDB->quote($a_filetitle, "text"));
                $res = array();
                while($row = $ilDB->fetchAssoc($set))
                {
                        $res[$row["ass_id"]] = $row;
                }
                return $res;
        }
        
        function deleteAllFiles()
        {                                               
                $files = array();
                foreach($this->getFiles() as $item)
                {
                        $files[] = $item["returned_id"];
                }
                if(sizeof($files))
                {
                        $this->deleteSelectedFiles($files);             
                }
        }
 
        function deleteSelectedFiles(array $file_id_array)
        {               
                global $ilDB;
                                
                $user_ids = $this->getUserIds();
                if(!$user_ids || 
                        !sizeof($file_id_array))
                {
                        return;
                }
                
                if (count($file_id_array))
                {                                                                               
                        $result = $ilDB->query("SELECT * FROM exc_returned".
                                " WHERE ".$ilDB->in("returned_id", $file_id_array, false, "integer").
                                " AND ".$ilDB->in("user_id", $user_ids, "", "integer"));        
                        
                        if ($ilDB->numRows($result))
                        {                                                               
                                $result_array = array();
                                while ($row = $ilDB->fetchAssoc($result))
                                {
                                        $row["timestamp"] = $row["ts"];
                                        array_push($result_array, $row);
                                }
                                
                                // delete the entries in the database
                                $ilDB->manipulate("DELETE FROM exc_returned".
                                        " WHERE ".$ilDB->in("returned_id", $file_id_array, false, "integer").
                                        " AND ".$ilDB->in("user_id", $user_ids, "", "integer"));
                                
                                // delete the files                             
                                $path = $this->initStorage()->getAbsoluteSubmissionPath();
                                foreach ($result_array as $key => $value)
                                {
                                        if($value["filename"])
                                        {
                                                if($this->team)
                                                {
                                                        $this->team->writeLog(ilExAssignmentTeam::TEAM_LOG_REMOVE_FILE, 
                                                                $value["filetitle"]);
                                                }
                                                
                                                $filename = $path."/".$value["user_id"]."/".basename($value["filename"]);
                                                unlink($filename);
                                        }
                                }
                        }
                }               
        }
        
        public static function deleteUser($a_exc_id, $a_user_id)
        {
                
                include_once("./Modules/Exercise/classes/class.ilExAssignment.php");
                
                foreach(ilExAssignment::getInstancesByExercise($a_exc_id) as $ass)
                {
                        $submission = new self($ass, $a_user_id);
                        $submission->deleteAllFiles();
                        
                        // remove from any team
                        $team = $submission->getTeam();
                        if($team)
                        {
                                $team->removeTeamMember($a_user_id);
                        }
                        
                        // #14900
                        $member_status = $ass->getMemberStatus($a_user_id);
                        $member_status->setStatus("notgraded");         
                        $member_status->update();
                }       
        }
        
        protected function getLastDownloadTime(array $a_user_ids)
        {
                global $ilDB, $ilUser;
        
                $q = "SELECT download_time FROM exc_usr_tutor WHERE ".
                        " ass_id = ".$ilDB->quote($this->getAssignment()->getId(), "integer")." AND ".
                        $ilDB->in("usr_id", $a_user_ids, "", "integer")." AND ".
                        " tutor_id = ".$ilDB->quote($ilUser->getId(), "integer");
                $lu_set = $ilDB->query($q);
                $lu_rec = $ilDB->fetchAssoc($lu_set);
                return $lu_rec["download_time"];                
        }
        
        function downloadFiles(array $a_file_ids = null, $a_only_new = false, $a_peer_review_mask_filename = false)
        {                       
                global $ilUser, $lng;
                
                $user_ids = $this->getUserIds();
                $is_team = $this->assignment->hasTeam();
                
                // get last download time
                $download_time = null;
                if ($a_only_new)
                {
                        $download_time = $this->getLastDownloadTime($user_ids);                                 
                }
                
                if($this->is_tutor)
                {
                        $this->updateTutorDownloadTime();               
                }               
                
                if($a_peer_review_mask_filename)
                {
                        // process peer review sequence id
                        $peer_id = null;
                        foreach($this->peer_review->getPeerReviewsByGiver($ilUser->getId()) as $idx => $item)
                        {
                                if($item["peer_id"] == $this->getUserId())
                                {
                                        $peer_id = $idx+1;
                                        break;
                                }
                        }       
 
                        // this will remove personal info from zip-filename
                        $is_team = true;
                }
        
                $files = $this->getFiles($a_file_ids, false, $download_time);           
                if($files)
                {
                        if (sizeof($files) == 1)
                        {                       
                                $file = array_pop($files);
 
                                switch($this->assignment->getType())
                                {
                                        case ilExAssignment::TYPE_BLOG:
                                        case ilExAssignment::TYPE_PORTFOLIO:
                                                $file["filetitle"] = ilObjUser::_lookupName($file["user_id"]);
                                                $file["filetitle"] = ilObject::_lookupTitle($this->assignment->getExerciseId())." - ".
                                                        $this->assignment->getTitle()." - ".
                                                        $file["filetitle"]["firstname"]." ".
                                                        $file["filetitle"]["lastname"]." (".
                                                        $file["filetitle"]["login"].").zip";
                                                break;
 
                                        default:
                                                break;
                                }               
 
                                if($a_peer_review_mask_filename)
                                {
                                        $suffix = array_pop(explode(".", $file["filetitle"]));
                                        $file["filetitle"] = $this->assignment->getTitle()."_peer".$peer_id.".".$suffix;                                                        
                                }
                                else if($file["late"])
                                {
                                        $file["filetitle"] = $lng->txt("exc_late_submission")." - ".
                                                $file["filetitle"];
                                }
 
                                $this->downloadSingleFile($file["user_id"], $file["filename"], $file["filetitle"]);
                        }
                        else 
                        {
                                $array_files = array();
                                foreach($files as $seq => $file)
                                {                                               
                                        $src = basename($file["filename"]);                             
                                        if($a_peer_review_mask_filename)
                                        {                                                                       
                                                $suffix = array_pop(explode(".", $src));
                                                $tgt = $this->assignment->getTitle()."_peer".$peer_id.
                                                        "_".(++$seq).".".$suffix;                       
                                                
                                                $array_files[$file["user_id"]][] = array(
                                                        "src" => $src, 
                                                        "tgt" => $tgt
                                                );
                                        }
                                        else
                                        {                                               
                                                $array_files[$file["user_id"]][] = array(
                                                        "src" => $src,
                                                        "late" => $file["late"]                                                 
                                                );
                                        }                               
                                }                       
                                                                
                                $this->downloadMultipleFiles($array_files, 
                                        ($is_team ? null : $this->getUserId()), $is_team);
                        }
                }
                else
                {
                        return false;
                }
 
                return true;
        }
 
        // Update the timestamp of the last download of current user (=tutor)   
        public function updateTutorDownloadTime()
        {
                global $ilUser, $ilDB;
                                
                $exc_id = $this->assignment->getExerciseId();
                $ass_id = $this->assignment->getId();
 
                foreach($this->getUserIds() as $user_id)
                {
                        $ilDB->manipulateF("DELETE FROM exc_usr_tutor ".
                                "WHERE ass_id = %s AND usr_id = %s AND tutor_id = %s",
                                array("integer", "integer", "integer"),
                                array($ass_id, $user_id, $ilUser->getId()));
 
                        $ilDB->manipulateF("INSERT INTO exc_usr_tutor (ass_id, obj_id, usr_id, tutor_id, download_time) VALUES ".
                                "(%s, %s, %s, %s, %s)",
                                array("integer", "integer", "integer", "integer", "timestamp"),
                                array($ass_id, $exc_id, $user_id, $ilUser->getId(), ilUtil::now()));
                }
        }
 
        protected function downloadSingleFile($a_user_id, $filename, $filetitle)
        {       
                $filename = $this->initStorage()->getAbsoluteSubmissionPath().
                        "/".$a_user_id."/".basename($filename);
 
                ilUtil::deliverFile($filename, $filetitle);
        }
 
        protected function downloadMultipleFiles($a_filenames, $a_user_id, $a_multi_user = false)
        {                                       
                global $lng;
                
                $path = $this->initStorage()->getAbsoluteSubmissionPath();
                
                $cdir = getcwd();
 
                $zip = PATH_TO_ZIP;
                $tmpdir = ilUtil::ilTempnam();
                $tmpfile = ilUtil::ilTempnam();
                $tmpzipfile = $tmpfile . ".zip";
 
                ilUtil::makeDir($tmpdir);
                chdir($tmpdir);
 
                $assTitle = ilExAssignment::lookupTitle($this->assignment->getId());
                $deliverFilename = str_replace(" ", "_", $assTitle);
                if ($a_user_id > 0 && !$a_multi_user)
                {
                        $userName = ilObjUser::_lookupName($a_user_id);
                        $deliverFilename .= "_".$userName["lastname"]."_".$userName["firstname"];
                }
                else
                {
                        $deliverFilename .= "_files";
                }
                $orgDeliverFilename = trim($deliverFilename);
                $deliverFilename = ilUtil::getASCIIFilename($orgDeliverFilename);
                ilUtil::makeDir($tmpdir."/".$deliverFilename);
                chdir($tmpdir."/".$deliverFilename);
                        
                //copy all files to a temporary directory and remove them afterwards
                $parsed_files = $duplicates = array();
                foreach ($a_filenames as $user_id => $files)
                {
                        $pathname = $path."/".$user_id;
 
                        foreach($files as $filename)
                        {
                                // peer review masked filenames, see deliverReturnedFiles()
                                if(isset($filename["tgt"]))
                                {
                                        $newFilename = $filename["tgt"];
                                        $filename = $filename["src"];
                                }
                                else
                                {
                                        $late = $filename["late"];
                                        $filename = $filename["src"];
                                        
                                        // remove timestamp
                                        $newFilename = trim($filename);
                                        $pos = strpos($newFilename , "_");
                                        if ($pos !== false)
                                        {                               
                                                $newFilename = substr($newFilename, $pos + 1);
                                        }
                                        // #11070
                                        $chkName = strtolower($newFilename);
                                        if(array_key_exists($chkName, $duplicates))
                                        {
                                                $suffix = strrpos($newFilename, ".");                                           
                                                $newFilename = substr($newFilename, 0, $suffix).
                                                        " (".(++$duplicates[$chkName]).")".
                                                        substr($newFilename, $suffix);
                                        }
                                        else
                                        {
                                                $duplicates[$chkName] = 1;
                                        }
                                        
                                        if($late)
                                        {
                                                $newFilename = $lng->txt("exc_late_submission")." - ".
                                                        $newFilename;
                                        }                                                                               
                                }
                                
                                $newFilename = ilUtil::getASCIIFilename($newFilename);
                                $newFilename = $tmpdir.DIRECTORY_SEPARATOR.$deliverFilename.DIRECTORY_SEPARATOR.$newFilename;
                                // copy to temporal directory
                                $oldFilename =  $pathname.DIRECTORY_SEPARATOR.$filename;
                                if (!copy ($oldFilename, $newFilename))
                                {
                                        echo 'Could not copy '.$oldFilename.' to '.$newFilename;
                                }
                                touch($newFilename, filectime($oldFilename));
                                $parsed_files[] =  ilUtil::escapeShellArg($deliverFilename.DIRECTORY_SEPARATOR.basename($newFilename)); 
                        }
                }                               
                
                chdir($tmpdir);
                $zipcmd = $zip." ".ilUtil::escapeShellArg($tmpzipfile)." ".join($parsed_files, " ");
 
                exec($zipcmd);
                ilUtil::delDir($tmpdir);
                
                chdir($cdir);
                ilUtil::deliverFile($tmpzipfile, $orgDeliverFilename.".zip", "", false, true);
                exit;
        }
 
        public static function downloadAllAssignmentFiles(ilExAssignment $a_ass, array $members)
        {
                global $lng;
                
                include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
                
                $storage = new ilFSStorageExercise($a_ass->getExerciseId(), $a_ass->getId());
                $storage->create();
                
                ksort($members);
                //$savepath = $this->getExercisePath() . "/" . $this->obj_id . "/";
                $savepath = $storage->getAbsoluteSubmissionPath();
                $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($savepath))
                {
                        return;
                }
                // Safe mode fix
//              chdir($this->getExercisePath());
                chdir($storage->getTempPath());
                $zip = PATH_TO_ZIP;
 
                // check first, if we have enough free disk space to copy all files to temporary directory
                $tmpdir = ilUtil::ilTempnam();
                ilUtil::makeDir($tmpdir);
                chdir($tmpdir);
 
                // check free diskspace
                $dirsize = 0;
                foreach (array_keys($members) as $id) 
                {
                        $directory = $savepath.DIRECTORY_SEPARATOR.$id;
                        $dirsize += ilUtil::dirsize($directory);
                }
                if ($dirsize > disk_free_space($tmpdir)) 
                {
                        return -1;
                }
                
                $ass_type = $a_ass->getType();
 
                // copy all member directories to the temporary folder
                // switch from id to member name and append the login if the member name is double
                // ensure that no illegal filenames will be created
                // remove timestamp from filename               
                if($a_ass->hasTeam())
                {
                        $team_dirs = array();
                        $team_map = ilExAssignmentTeam::getAssignmentTeamMap($a_ass->getId());
                }               
                foreach ($members as $id => $item)
                {               
                        $user = $item["name"];
                        $user_files = $item["files"];
                        
                        $sourcedir = $savepath.DIRECTORY_SEPARATOR.$id;
                        if (!is_dir($sourcedir))
                        {
                                continue;
                        }
                        
                        $userName = ilObjUser::_lookupName($id);
                        
                        // group by teams
                        $team_dir= "";
                        if(is_array($team_map) &&
                                array_key_exists($id, $team_map))
                        {
                                $team_id = $team_map[$id];
                                if(!array_key_exists($team_id, $team_dirs))
                                {
                                        $team_dir = $lng->txt("exc_team")." ".$team_id;
                                        ilUtil::makeDir($team_dir);                                             
                                        $team_dirs[$team_id] = $team_dir;
                                }
                                $team_dir = $team_dirs[$team_id].DIRECTORY_SEPARATOR;
                        }
                        
                        $targetdir = $team_dir.ilUtil::getASCIIFilename(                                
                                trim($userName["lastname"])."_".
                                trim($userName["firstname"])."_".
                                trim($userName["login"])."_".
                                $userName["user_id"]
                        );                                              
                        ilUtil::makeDir($targetdir);                    
                                                
                        $sourcefiles = scandir($sourcedir);
                        $duplicates = array();
                        foreach ($sourcefiles as $sourcefile) {
                                if ($sourcefile == "." || $sourcefile == "..")
                                {
                                        continue;
                                }
                                
                                $targetfile = trim(basename($sourcefile));
                                $pos = strpos($targetfile, "_");
                                if ($pos !== false)
                                {                                               
                                        $targetfile= substr($targetfile, $pos + 1);
                                }
                                
                                // #14536 
                                if(array_key_exists($targetfile, $duplicates))
                                {
                                        $suffix = strrpos($targetfile, ".");                                            
                                        $targetfile = substr($targetfile, 0, $suffix).
                                                " (".(++$duplicates[$targetfile]).")".
                                                substr($targetfile, $suffix);                           
                                }
                                else
                                {
                                        $duplicates[$targetfile] = 1;
                                }                                
                                
                                // late submission?
                                foreach($user_files as $file)
                                {
                                        if(basename($file["filename"]) == $sourcefile)
                                        {
                                                if($file["late"])
                                                {
                                                        $targetfile = $lng->txt("exc_late_submission")." - ".
                                                                $targetfile;
                                                }
                                                break;
                                        }
                                }
                                
                                $targetfile = ilUtil::getASCIIFilename($targetfile);
                                $targetfile = $targetdir.DIRECTORY_SEPARATOR.$targetfile;
                                $sourcefile = $sourcedir.DIRECTORY_SEPARATOR.$sourcefile;
 
                                if (!copy ($sourcefile, $targetfile))
                                {
                                        include_once "Modules/Exercise/exceptions/class.ilExerciseException.php";
                                        throw new ilExerciseException("Could not copy ".basename($sourcefile)." to '".$targetfile."'.");                                        
                                }
                                else
                                {
                                        // preserve time stamp
                                        touch($targetfile, filectime($sourcefile));
                                        
                                        // blogs and portfolios are stored as zip and have to be unzipped
                                        if($ass_type == ilExAssignment::TYPE_PORTFOLIO || 
                                                $ass_type == ilExAssignment::TYPE_BLOG)
                                        {
                                                ilUtil::unzip($targetfile);
                                                unlink($targetfile);
                                        }                                       
                                }
 
                        }
                }
                
                $tmpfile = ilUtil::ilTempnam();
                $tmpzipfile = $tmpfile . ".zip";
                // Safe mode fix
                $zipcmd = $zip." -r ".ilUtil::escapeShellArg($tmpzipfile)." .";
                exec($zipcmd);
                ilUtil::delDir($tmpdir);
 
                $assTitle = $a_ass->getTitle()."_".$a_ass->getId();
                chdir($cdir);
                ilUtil::deliverFile($tmpzipfile, (strlen($assTitle) == 0
                        ? strtolower($lng->txt("exc_assignment"))
                        : $assTitle). ".zip", "", false, true);
        }
 
        function getLastSubmission()
        {
                global $ilDB;
        
                $ilDB->setLimit(1);
 
                $q = "SELECT obj_id,user_id,ts FROM exc_returned".
                        " WHERE ass_id = ".$ilDB->quote($this->assignment->getId(), "integer").
                        " AND ".$ilDB->in("user_id", $this->getUserIds(), "", "integer").
                        " AND (filename IS NOT NULL OR atext IS NOT NULL)".
                        " AND ts IS NOT NULL".
                        " ORDER BY ts DESC";
                $usr_set = $ilDB->query($q);
                $array = $ilDB->fetchAssoc($usr_set);           
                return ilUtil::getMySQLTimestamp($array["ts"]);                 
        }
 
        
        //
        // OBJECTS
        // 
        
        function addResourceObject($a_wsp_id, $a_text = null)
        {
                global $ilDB;
        
                $next_id = $ilDB->nextId("exc_returned");
                $query = sprintf("INSERT INTO exc_returned ".
                                                 "(returned_id, obj_id, user_id, filetitle, ass_id, ts, atext, late) ".
                                                 "VALUES (%s, %s, %s, %s, %s, %s, %s, %s)",
                        $ilDB->quote($next_id, "integer"),
                        $ilDB->quote($this->assignment->getExerciseId(), "integer"),
                        $ilDB->quote($this->getUserId(), "integer"),
                        $ilDB->quote($a_wsp_id, "text"),
                        $ilDB->quote($this->assignment->getId(), "integer"),
                        $ilDB->quote(ilUtil::now(), "timestamp"),
                        $ilDB->quote($a_text, "text"),
                        $ilDB->quote($this->isLate(), "integer")
                );
                $ilDB->manipulate($query);
                
                return $next_id;
        }
        
        public function deleteResourceObject($a_returned_id)
        {
                global $ilDB;
                
                $ilDB->manipulate("DELETE FROM exc_returned".
                        " WHERE obj_id = ".$ilDB->quote($this->assignment->getExerciseId(), "integer").
                        " AND user_id = ".$ilDB->quote($this->getUserId(), "integer").
                        " AND ass_id = ".$ilDB->quote($this->assignment->getId(), "integer").
                        " AND returned_id = ".$ilDB->quote($a_returned_id, "integer"));         
        }
        
        function updateTextSubmission($a_text)
        {
                global $ilDB;
                
                $files = $this->getFiles();
                
                // no text = remove submission
                if(!trim($a_text))
                {
                        $this->deleteAllFiles();
                        return;
                }
                                
                if(!$files)
                {                       
                        return $this->addResourceObject("TEXT", $a_text);
                }
                else
                {
                        $files = array_shift($files);
                        $id = $files["returned_id"];
                        if($id)
                        {
                                $ilDB->manipulate("UPDATE exc_returned".
                                        " SET atext = ".$ilDB->quote($a_text, "text").
                                        ", ts = ".$ilDB->quote(ilUtil::now(), "timestamp").
                                        ", late = ".$ilDB->quote($this->isLate(), "integer").
                                        " WHERE returned_id = ".$ilDB->quote($id, "integer"));
                                return $id;
                        }
                }
        }
        
        
        //
        // GUI helper
        //
        
        // :TODO:
        
        public function getDownloadedFilesInfoForTableGUIS($a_parent_obj, $a_parent_cmd = null)
        {
                global $lng, $ilCtrl;
                
                $result = array();
                $result["files"]["count"] = "---";
        
                // submission:
                // see if files have been resubmmited after solved
                $last_sub =     $this->getLastSubmission();
                if ($last_sub)
                {
                        $last_sub = ilDatePresentation::formatDate(new ilDateTime($last_sub,IL_CAL_DATETIME));
                }
                else
                {
                        $last_sub = "---";
                }
                /* #13741 - status_time has been reduced to grading (mark/status)
                if (self::lookupUpdatedSubmission($a_ass_id, $a_user_id) == 1) 
                {
                        $last_sub = "<b>".$last_sub."</b>";
                }                
                */              
                $result["last_submission"]["txt"] = $lng->txt("exc_last_submission");
                $result["last_submission"]["value"] = $last_sub;
                
                // #16994
                $ilCtrl->setParameterByClass("ilexsubmissionfilegui", "member_id", $this->getUserId());
                
                // assignment type specific
                switch($this->assignment->getType())
                {                       
                        case ilExAssignment::TYPE_UPLOAD_TEAM:
                                // data is merged by team - see above
                                // fallthrough
                                
                        case ilExAssignment::TYPE_UPLOAD:                               
                                $all_files = $this->getFiles();
                                $late_files = 0;
                                foreach($all_files as $file)
                                {
                                        if($file["late"])
                                        {
                                                $late_files++;
                                        }
                                }
                                
                                // nr of submitted files
                                $result["files"]["txt"] = $lng->txt("exc_files_returned");                                              
                                if ($late_files)
                                {
                                        $result["files"]["txt"].= ' - <span class="warning">'.$lng->txt("exc_late_submission")." (".$late_files.")</span>";
                                }                               
                                $sub_cnt = count($all_files);
                                $new = $this->lookupNewFiles();
                                if (count($new) > 0)
                                {
                                        $sub_cnt.= " ".sprintf($lng->txt("cnt_new"),count($new));
                                }
                                
                                $result["files"]["count"] = $sub_cnt;
 
                                // download command                                                             
                                if ($sub_cnt > 0)
                                {
                                        $result["files"]["download_url"] = 
                                                $ilCtrl->getLinkTargetByClass("ilexsubmissionfilegui", "downloadReturned");
                                                                        
                                        if (count($new) <= 0)
                                        {
                                                $result["files"]["download_txt"] = $lng->txt("exc_tbl_action_download_files");
                                        }
                                        else
                                        {
                                                $result["files"]["download_txt"] = $lng->txt("exc_tbl_action_download_all_files");
                                        }
                                        
                                        // download new files only
                                        if (count($new) > 0)
                                        {
                                                $result["files"]["download_new_url"] = 
                                                        $ilCtrl->getLinkTargetByClass("ilexsubmissionfilegui", "downloadNewReturned");
                                                
                                                $result["files"]["download_new_txt"] = $lng->txt("exc_tbl_action_download_new_files");                                          
                                        }
                                }
                                break;
                                
                        case ilExAssignment::TYPE_BLOG:                         
                                $result["files"]["txt"] =$lng->txt("exc_blog_returned");                                
                                $blogs = $this->getFiles();
                                if($blogs)
                                {
                                        $blogs = array_pop($blogs);                                     
                                        if($blogs && substr($blogs["filename"], -1) != "/")
                                        {                                               
                                                if($blogs["late"])
                                                {
                                                        $result["files"]["txt"].= ' - <span class="warning">'.$lng->txt("exc_late_submission")."</span>";
                                                }       
                                                
                                                $result["files"]["count"] = 1;
                                                                                        
                                                $result["files"]["download_url"] = 
                                                        $ilCtrl->getLinkTargetByClass("ilexsubmissionfilegui", "downloadReturned");
                                                
                                                $result["files"]["download_txt"] = $lng->txt("exc_tbl_action_download_files");                                          
                                        }
                                }
                                break;
                                
                        case ilExAssignment::TYPE_PORTFOLIO:
                                $result["files"]["txt"] = $lng->txt("exc_portfolio_returned");                          
                                $portfolios = $this->getFiles();
                                if($portfolios)
                                {
                                        $portfolios = array_pop($portfolios);                                                                   
                                        if($portfolios && substr($portfolios["filename"], -1) != "/")
                                        {       
                                                if($portfolios["late"])
                                                {
                                                        $result["files"]["txt"].= ' - <span class="warning">'.$lng->txt("exc_late_submission")."</span>";
                                                }       
                                                
                                                $result["files"]["count"] = 1;
                                                                                                
                                                $result["files"]["download_url"] = 
                                                        $ilCtrl->getLinkTargetByClass("ilexsubmissionfilegui", "downloadReturned");             
                                                
                                                $result["files"]["download_txt"] = $lng->txt("exc_tbl_action_download_files");                                          
                                        }
                                }
                                break;
                                
                        case ilExAssignment::TYPE_TEXT:
                                $result["files"]["txt"] = $lng->txt("exc_files_returned_text");
                                $files = $this->getFiles();
                                if($files)
                                {
                                        $result["files"]["count"] = 1;
                                        
                                        $files = array_shift($files);                                                                                                                   
                                        if(trim($files["atext"]))
                                        {                                                       
                                                if($files["late"])
                                                {
                                                        $result["files"]["txt"].= ' - <span class="warning">'.$lng->txt("exc_late_submission")."</span>";
                                                }       
                                                
                                                $result["files"]["download_url"] =
                                                        $ilCtrl->getLinkTargetByClass("ilexsubmissiontextgui", "showAssignmentText");                                                                                           
                                                
                                                $result["files"]["download_txt"] = $lng->txt("exc_tbl_action_text_assignment_show");                                            
                                        }
                                }
                                break;
                }
                
                $ilCtrl->setParameterByClass("ilexsubmissionfilegui", "member_id", "");
                
                return $result;
        }
}