ilinc/classes/class.ilObjiLincCourse.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2005 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.ilObject.php');
require_once ('class.ilnetucateXMLAPI.php');

class ilObjiLincCourse extends ilObject
{
        function ilObjiLincCourse($a_id = 0,$a_call_by_reference = true)
        {
                $this->type = "icrs";
                $this->ilObject($a_id,$a_call_by_reference);
                $this->setRegisterMode(false);
                $this->ilincAPI = new ilnetucateXMLAPI();
                
                $this->docent_ids = array();
                $this->student_ids = array();
        }
        
        function read()
        {
                parent::read();
                
                // TODO: fetching default role should be done in rbacadmin
                $q = "SELECT * FROM ilinc_data ".
                         "WHERE obj_id='".$this->id."'";
                $r = $this->ilias->db->query($q);

                if ($r->numRows() > 0)
                {
                        $data = $r->fetchRow(DB_FETCHMODE_OBJECT);

                        $this->ilinc_id = $data->course_id;
                        $this->activated = ilUtil::yn2tf($data->activation_offline);
                }
                else
                {
                         $this->ilias->raiseError("<b>Error: There is no dataset with id ".$this->id."!</b><br />class: ".get_class($this)."<br />Script: ".__FILE__."<br />Line: ".__LINE__, $this->ilias->FATAL);
                }
        }
        
        function getiLincId()
        {
                return $this->ilinc_id;
        }
        
        function getErrorMsg()
        {
                $err_msg = $this->error_msg;
                $this->error_msg = "";

                return $err_msg;
        }

        function update()
        {
                $this->ilincAPI->editCourse($this->getiLincId(),$_POST["Fobject"]);
                $response = $this->ilincAPI->sendRequest();
                
                if ($response->isError())
                {
                        $this->error_msg = $response->getErrorMsg();
                        return false;
                }


                if (!parent::update())
                {                       
                        $this->error_msg = "database_error";
                        return false;
                }
                
                $q = "UPDATE ilinc_data SET activation_offline='".$this->activated."' WHERE obj_id=".$this->getId()."";
                $r = $this->ilias->db->query($q);
                
                return true;
        }
        
        function addCourse()
        {
                $this->ilincAPI->addCourse($_POST["Fobject"]);
                $response = $this->ilincAPI->sendRequest();
                
                if ($response->isError())
                {
                        $this->error_msg = $response->getErrorMsg();
                        return false;
                }
                
                $this->ilinc_id = $response->getFirstID();
                
                return true;
        }
        
        function ilClone($a_parent_ref)
        {               
                global $rbacadmin;

                // always call parent clone function first!!
                $new_ref_id = parent::ilClone($a_parent_ref);
                
                // get object instance of cloned object
                //$newObj =& $this->ilias->obj_factory->getInstanceByRefId($new_ref_id);

                // create a local role folder & default roles
                //$roles = $newObj->initDefaultRoles();

                // ...finally assign role to creator of object
                //$rbacadmin->assignUser($roles[0], $newObj->getOwner(), "n");          

                // always destroy objects in clone method because clone() is recursive and creates instances for each object in subtree!
                //unset($newObj);

                // ... and finally always return new reference ID!!
                return $new_ref_id;
        }

        function delete()
        {               
                // always call parent delete function first!!
                if (!parent::delete())
                {
                        return false;
                }
                
                //put here your module specific stuff
                $q = "DELETE FROM ilinc_data WHERE course_id='".$this->getiLincId()."'";
                $this->ilias->db->query($q);
                
                // TODO: delete data in ilinc_registration table
                
                // remove course from ilinc server
                $this->ilincAPI->removeCourse($this->getiLincId());
                $response = $this->ilincAPI->sendRequest();

                return true;
        }
        
        // store iLinc Id in ILIAS and set variable
        function storeiLincId($a_icrs_id)
        {
                $q = "INSERT INTO ilinc_data (obj_id,type,course_id,activation_offline) VALUES (".$this->id.",'icrs','".$a_icrs_id."','".$this->activated."')";
                $this->ilias->db->query($q);
                
                $this->ilinc_id = $a_icrs_id;
        }
        
        // saveActivationStatus()
        function saveActivationStatus($a_activated)
        {
                $q = "UPDATE ilinc_data SET activation_offline='".$a_activated."' WHERE obj_id=".$this->getId()."";
                $r = $this->ilias->db->query($q);
        }
        
        function initDefaultRoles()
        {
                global $rbacadmin, $rbacreview;

                // create a local role folder
                $rfoldObj =& $this->createRoleFolder();

                // ADMIN ROLE
                // create role and assign role to rolefolder...
                $roleObj = $rfoldObj->createRole("il_icrs_admin_".$this->getRefId(),"LearnLinc admin of seminar obj_no.".$this->getId());
                $this->m_roleAdminId = $roleObj->getId();

                //set permission template of new local role
                $q = "SELECT obj_id FROM object_data WHERE type='rolt' AND title='il_icrs_admin'";
                $r = $this->ilias->db->getRow($q, DB_FETCHMODE_OBJECT);
                $rbacadmin->copyRolePermission($r->obj_id,ROLE_FOLDER_ID,$rfoldObj->getRefId(),$roleObj->getId());

                // set object permissions of icrs object
                $ops = $rbacreview->getOperationsOfRole($roleObj->getId(),"icrs",$rfoldObj->getRefId());
                $rbacadmin->grantPermission($roleObj->getId(),$ops,$this->getRefId());

                // set object permissions of role folder object
                $ops = $rbacreview->getOperationsOfRole($roleObj->getId(),"rolf",$rfoldObj->getRefId());
                $rbacadmin->grantPermission($roleObj->getId(),$ops,$rfoldObj->getRefId());

                // MEMBER ROLE
                // create role and assign role to rolefolder...
                $roleObj = $rfoldObj->createRole("il_icrs_member_".$this->getRefId(),"LearnLinc admin of seminar obj_no.".$this->getId());
                $this->m_roleMemberId = $roleObj->getId();

                //set permission template of new local role
                $q = "SELECT obj_id FROM object_data WHERE type='rolt' AND title='il_icrs_member'";
                $r = $this->ilias->db->getRow($q, DB_FETCHMODE_OBJECT);
                $rbacadmin->copyRolePermission($r->obj_id,ROLE_FOLDER_ID,$rfoldObj->getRefId(),$roleObj->getId());
                
                // set object permissions of icrs object
                $ops = $rbacreview->getOperationsOfRole($roleObj->getId(),"icrs",$rfoldObj->getRefId());
                $rbacadmin->grantPermission($roleObj->getId(),$ops,$this->getRefId());

                // set object permissions of role folder object
                $ops = $rbacreview->getOperationsOfRole($roleObj->getId(),"rolf",$rfoldObj->getRefId());
                $rbacadmin->grantPermission($roleObj->getId(),$ops,$rfoldObj->getRefId());

                unset($rfoldObj);
                unset($roleObj);

                $roles[] = $this->m_roleAdminId;
                $roles[] = $this->m_roleMemberId;
                return $roles ? $roles : array();
        }

        function notify($a_event,$a_ref_id,$a_parent_non_rbac_id,$a_node_id,$a_params = 0)
        {
                return true;
        }
        
        function addMember(&$a_user_obj, $a_mem_role, $a_instructor = false)
        {
                global $rbacadmin;
//echo "0";
                if (!isset($a_user_obj) && !isset($a_mem_role))
                {
                        $this->error_msg = get_class($this)."::addMember(): Missing parameters !";
                        return false;
                }
//echo "1";
                // check if user is registered at iLinc server
                if (!$this->userExists($a_user_obj))
                {
                        // if not, add user on iLinc server
                        if ($this->addUser($a_user_obj) == false)
                        {
                                // error_msg already set
                                return false;
                        }
                }
//echo "2";
                // assign membership to icourse on iLinc server
                if (!$this->registerUser($a_user_obj,$a_instructor))
                {
                        // error_msg already set
                        return false;
                }
//echo "3";
                // finally assign user to member role in ILIAS
                $this->join($a_user_obj->getId(),$a_mem_role);
//echo "4";
                return true;
        }

        function join($a_user_id, $a_mem_role="")
        {
                global $rbacadmin;

                if (is_array($a_mem_role))
                {
                        foreach ($a_mem_role as $role)
                        {
                                $rbacadmin->assignUser($role,$a_user_id, false);
                        }
                }
                else
                {
                        $rbacadmin->assignUser($a_mem_role,$a_user_id, false);
                }

                ilObjUser::updateActiveRoles($a_user_id);
                return true;
        }
        
        function leave($a_user_id)
        {
                global $rbacadmin;

                $arr_groupRoles = $this->getMemberRoles($a_user_id);

                if (is_array($arr_groupRoles))
                {
                        foreach ($arr_groupRoles as $groupRole)
                        {
                                $rbacadmin->deassignUser($groupRole, $a_user_id);
                        }
                }
                else
                {
                        $rbacadmin->deassignUser($arr_groupRoles, $a_user_id);
                }

                ilObjUser::updateActiveRoles($a_user_id);
                return true;
        }
        
        function getMemberRoles($a_user_id)
        {
                global $rbacadmin, $rbacreview;

                $arr_assignedRoles = array();

                $arr_assignedRoles = array_intersect($rbacreview->assignedRoles($a_user_id),$this->getLocalRoles());

                return $arr_assignedRoles;
        }
        
        function getMemberIds()
        {
                global $rbacadmin, $rbacreview;

                $usr_arr= array();

                $rol  = $this->getLocalRoles();

                foreach ($rol as $value)
                {
                        foreach ($rbacreview->assignedUsers($value) as $member_id)
                        {
                                array_push($usr_arr,$member_id);
                        }
                }

                $mem_arr = array_unique($usr_arr);
                
                return $mem_arr ? $mem_arr : array();
        }
        
        function getMemberData($a_mem_ids, $active = 1)
        {
                global $rbacadmin, $rbacreview, $ilBench, $ilDB;

                $usr_arr= array();
                
                $q = "SELECT login,firstname,lastname,title,usr_id,ilinc_id ".
                         "FROM usr_data ".
                         "WHERE usr_id IN (".implode(',',$a_mem_ids).")";
                         
                if (is_numeric($active) && $active > -1)
                        $q .= "AND active = '$active'";                  
                
                $r = $ilDB->query($q);
                
                while($row = $r->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $mem_arr[] = array("id" => $row->usr_id,
                                                                "login" => $row->login,
                                                                "firstname" => $row->firstname,
                                                                "lastname" => $row->lastname,
                                                                "ilinc_id" => $row->ilinc_id
                                                                );
                }

                return $mem_arr ? $mem_arr : array();
        }
        
        function getLocalRoles($a_translate = false)
        {
                global $rbacadmin,$rbacreview;
                
                if (empty($this->local_roles))
                {
                        $this->local_roles = array();
                        $rolf      = $rbacreview->getRoleFolderOfObject($this->getRefId());
                        $role_arr  = $rbacreview->getRolesOfRoleFolder($rolf["ref_id"]);

                        foreach ($role_arr as $role_id)
                        {
                                if ($rbacreview->isAssignable($role_id,$rolf["ref_id"]) == true)
                                {
                                        $role_Obj =& $this->ilias->obj_factory->getInstanceByObjId($role_id);
                                        
                                        if ($a_translate)
                                        {
                                                $role_name = ilObjRole::_getTranslation($role_Obj->getTitle());
                                        }
                                        else
                                        {
                                                $role_name = $role_Obj->getTitle();
                                        }
                                        
                                        $this->local_roles[$role_name] = $role_Obj->getId();
                                }
                        }
                }
                
                return $this->local_roles;
        }
        
        function getMemberRolesTitle($a_user_id)
        {
                global $ilDB,$ilBench;
                
                include_once ('classes/class.ilObjRole.php');

                $str_member_roles ="";

                $q = "SELECT title ".
                         "FROM object_data ".
                         "LEFT JOIN rbac_ua ON object_data.obj_id=rbac_ua.rol_id ".
                         "WHERE object_data.type = 'role' ".
                         "AND rbac_ua.usr_id = ".$ilDB->quote($a_user_id)." ".
                         "AND rbac_ua.rol_id IN (".implode(',',$this->getLocalRoles()).")";

                $r = $ilDB->query($q);

                while($row = $r->fetchRow(DB_FETCHMODE_ASSOC))
                {
                        // display human readable role names for autogenerated roles
                        $str_member_roles .= ilObjRole::_getTranslation($row["title"]).", ";
                }

                return substr($str_member_roles,0,-2);
        }
        
        function getDefaultMemberRole()
        {
                $local_icrs_Roles = $this->getLocalRoles();

                return $local_icrs_Roles["il_icrs_member_".$this->getRefId()];
        }

        function getDefaultAdminRole()
        {
                $local_icrs_Roles = $this->getLocalRoles();

                return $local_icrs_Roles["il_icrs_admin_".$this->getRefId()];
        }
        
        function getClassrooms()
        {
                global $ilErr;
                
                if (!$this->ilias->getSetting("ilinc_active"))
                {
                        $this->error_msg = "ilinc_server_not_active";
                        return false;
                }

                $this->ilincAPI->findCourseClasses($this->getiLincId());
                $response = $this->ilincAPI->sendRequest();

                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_get_classrooms";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }

                if (!$response->data['classes'])
                {

                        $this->error_msg = $response->data['result']['cdata'];
                        return false;
                }

                //echo "3";
                foreach ($response->data['classes'] as $class_id => $data)
                {
                        $this->ilincAPI->findClass($class_id);
                        $response = $this->ilincAPI->sendRequest("findClass");

                        if ($response->data['classes'])
                        {
                                $full_class_data[$class_id] = $response->data['classes'][$class_id];
                        }
                }
                
                return $full_class_data;
        }
        
        // checks if user is already registered at iLinc server
        // TODO: check is only local in ILIAS not on iLinc server
        function userExists(&$a_user_obj)
        {
                $data = $a_user_obj->getiLincData();
                
                if (empty($data["id"]) and empty($data["login"]))
                {
                        return false;
                }
                
                return true;
        }
        
        // create user account on iLinc server
        function addUser(&$a_user_obj)
        {
                // create login and passwd for iLinc account
                $login_data = $this->__createLoginData($a_user_obj->getId(),$a_user_obj->getLogin(),$this->ilias->getSetting($inst_id));
                
                $this->ilincAPI->addUser($login_data,$a_user_obj);
                $response = $this->ilincAPI->sendRequest();

                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_add_user";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }
                
                $ilinc_user_id = $response->getFirstID();
                $a_user_obj->setiLincData($ilinc_user_id,$login_data["login"],$login_data["passwd"]);
                $a_user_obj->update();
                
                return true;
        }

        function __createLoginData($a_user_id,$a_user_login,$a_inst_id)
        {
                if (!$a_inst_id)
                {
                        $a_inst_id = "0";
                }

                $data["login"] = substr($a_user_login,0,3)."_".$a_user_id."_".$a_inst_id."_".time();
                $data["passwd"] = md5(microtime().$a_user_login.rand(10000, 32000));
                
                return $data;
        }
        
        function isMember($a_user_id = "")
        {
                if (strlen($a_user_id) == 0)
                {
                        $a_user_id = $this->ilias->account->getId();
                }

                $arr_members = $this->getMemberIds();

                if (in_array($a_user_id, $arr_members))
                {
                        return true;
                }
                
                return false;
        }
        
        function isDocent($a_user_obj = "")
        {
                if (!$a_user_obj)
                {
                        $a_user_obj =& $this->ilias->account;
                }
                
                $docents = $this->getiLincMemberIds(true);
                
                $ilinc_data = $a_user_obj->getiLincData();
                
                if (in_array($ilinc_data['id'],$docents))
                {
                        return true;
                }
                
                return false;
        }
        
        function registerUser(&$a_user_obj,$a_instructor = false)
        {
                if ($a_instructor === true)
                {
                        $a_instructor = "True";
                }
                else
                {
                        $a_instructor = "False";
                }

                $ilinc_data = $a_user_obj->getiLincData();
                $user[] = array('id' => $ilinc_data['id'], 'instructor' => $a_instructor);
                $this->ilincAPI->registerUser($this->getiLincId(),$user);
                $response = $this->ilincAPI->sendRequest("registerUser");
                
//var_dump($response->data);exit;

                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_register_user";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }
                
                return true;
        }
        
        function registerUsers($a_user_arr)
        {
                foreach ($a_user_arr as $user_id => $instructorflag)
                {
                        $flag = "False";
                        
                        if ($instructorflag == ILINC_MEMBER_DOCENT)
                        {
                                $flag = "True";
                        }
                        
                        $ilinc_users[] = array('id' => $user_id,'instructor' => $flag);
                }
                
                $this->ilincAPI->registerUser($this->getiLincId(),$ilinc_users);
                $response = $this->ilincAPI->sendRequest("registerUser");

                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_register_users";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }
                
                return true;
        }
        
        // unregister user from course on iLinc server
        function unregisterUser($a_user_obj)
        {
                $ilinc_data = $a_user_obj->getiLincData();
                
                // do not send request if user is not registered at iLinc server at all
                if ($ilinc_data['id'] == '0')
                {
                        return true;
                }
                
                $this->ilincAPI->unregisterUser($this->getiLincId(),array($ilinc_data['id']));
                $response = $this->ilincAPI->sendRequest();

                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_unregister_user";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }
                
                return true;
        }
        
        function unregisterUsers($a_ilinc_user_ids)
        {
                $this->ilincAPI->unregisterUser($this->getiLincId(),$a_ilinc_user_ids);
                $response = $this->ilincAPI->sendRequest();
                
                //var_dump($response->data);exit;
                
                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_unregister_users";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }
                
                return true;
        }
        
        function joinClass(&$a_user_obj,$a_ilinc_class_id)
        {
                $this->ilincAPI->joinClass($a_user_obj,$a_ilinc_class_id);
                $response = $this->ilincAPI->sendRequest("joinClass");

                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_join_class";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }
                
                // return URL to join class room
                return $response->data['url']['cdata'];
        }
        
        function userLogin(&$a_user_obj)
        {
                $this->ilincAPI->userLogin($a_user_obj);
                $response = $this->ilincAPI->sendRequest("userLogin");

                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_user_login";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }
                
                // return URL to join class room
                return $response->data['url']['cdata'];
        }
        
        // not used here
        function uploadPicture(&$a_user_obj,$a_lang)
        {
                $this->ilincAPI->uploadPicture($a_user_obj,$a_lang);
                $response = $this->ilincAPI->sendRequest("uploadPicture");

                if ($response->isError())
                {
                        if (!$response->getErrorMsg())
                        {
                                $this->error_msg = "err_upload_picture";
                        }
                        else
                        {
                                $this->error_msg = $response->getErrorMsg();
                        }
                        
                        return false;
                }
                
                // return URL to user's personal page
                return $response->data['url']['cdata'];
        }
        
        function getAdminIds($a_grpId="")
        {
                global $rbacreview;

                if (!empty($a_grpId))
                {
                        $grp_id = $a_grpId;
                }
                else
                {
                        $grp_id = $this->getRefId();
                }

                $usr_arr = array();
                $roles = $this->getDefaultRoles($this->getRefId());

                foreach ($rbacreview->assignedUsers($this->getDefaultAdminRole()) as $member_id)
                {
                        array_push($usr_arr,$member_id);
                }

                return $usr_arr;
        }
        
        function removeMember(&$a_user_obj)
        {
                if (!isset($a_user_obj))
                {
                        $this->error_msg = get_class($this)."::removeMember(): Missing parameters !";
                        return false;
                }
                
                if (!$this->isMember($a_user_obj->getId()))
                {
                        return true;
                }

                if (count($this->getMemberIds()) > 1)
                {
                        if ($this->isAdmin($a_user_obj->getId()) && count($this->getAdminIds()) < 2)
                        {
                                $this->error_msg = "ilinc_err_administrator_required";
                                return false;
                        }
                }
                
                // unregister from course on iLinc server
                if (!$this->unregisterUser($a_user_obj))
                {
                        // error_msg already set
                        return false;
                }

                $this->leave($a_user_obj->getId());

                return true;
        }

        function isAdmin($a_user_id)
        {
                global $rbacreview;

                $icrs_roles = $this->getDefaultRoles();

                if (in_array($a_user_id,$rbacreview->assignedUsers($icrs_roles["icrs_admin_role"])))
                {
                        return true;
                }
                else
                {
                        return false;
                }
        }
        
        function getDefaultRoles($a_grp_id="")
        {
                global $rbacadmin, $rbacreview;

                if (strlen($a_grp_id) > 0)
                {
                        $grp_id = $a_grp_id;
                }
                else
                {
                        $grp_id = $this->getRefId();
                }

                $rolf      = $rbacreview->getRoleFolderOfObject($grp_id);
                $role_arr  = $rbacreview->getRolesOfRoleFolder($rolf["ref_id"]);

                foreach ($role_arr as $role_id)
                {
                        $role_Obj =& $this->ilias->obj_factory->getInstanceByObjId($role_id);

                        $grp_Member ="il_icrs_member_".$grp_id;
                        $grp_Admin  ="il_icrs_admin_".$grp_id;

                        if (strcmp($role_Obj->getTitle(), $grp_Member) == 0 )
                        {
                                $arr_grpDefaultRoles["icrs_member_role"] = $role_Obj->getId();
                        }

                        if (strcmp($role_Obj->getTitle(), $grp_Admin) == 0)
                        {
                                $arr_grpDefaultRoles["icrs_admin_role"] = $role_Obj->getId();
                        }
                }

                return $arr_grpDefaultRoles;
        }
        
        // returns ilinc_user_ids of course (students=false,docents=true)
        function getiLincMemberIds($a_instructorflag = false)
        {
                if ($a_instructorflag == true)
                {
                        if ($this->docent_ids)
                        {
                                return $this->docent_ids;
                        }
                }
                else
                {
                        if ($this->student_ids)
                        {
                                return $this->student_ids;
                        }
                }
                
                $this->ilincAPI->findRegisteredUsersByRole($this->getiLincId(),$a_instructorflag);
                $response = $this->ilincAPI->sendRequest();
                        
                if (is_array($response->data['users']))
                {
                        if ($a_instructorflag == true)
                        {
                                $this->docent_ids = array_keys($response->data['users']);
                        }
                        else
                        {
                                $this->student_ids = array_keys($response->data['users']);
                        }

                        return array_keys($response->data['users']);
                }
                
                return array();
        }
        
        function checkiLincMemberStatus($a_ilinc_user_id,$a_docent_ids,$a_student_ids)
        {
                if (in_array($a_ilinc_user_id,$a_docent_ids))
                {
                        return ILINC_MEMBER_DOCENT;
                }
                
                if (in_array($a_ilinc_user_id,$a_student_ids))
                {
                        return ILINC_MEMBER_STUDENT;
                }
                        
                return ILINC_MEMBER_NOTSET;
        }
        
        function _isActivated($a_course_obj_id)
        {
                global $ilDB,$ilias;

                if (!$ilias->getSetting("ilinc_active"))
                {
                        return false;
                }
                
                $q = "SELECT activation_offline FROM ilinc_data WHERE obj_id=".$ilDB->quote($a_course_obj_id);
                $r = $ilDB->query($q);
                
                $row = $r->fetchRow(DB_FETCHMODE_OBJECT);

                return ilUtil::yn2tf($row->activation_offline);
        }
        
        function _isMember($a_user_id,$a_ref_id)
        {
                global $rbacreview;
                
                $rolf = $rbacreview->getRoleFolderOfObject($a_ref_id);
                $local_roles = $rbacreview->getRolesOfRoleFolder($rolf["ref_id"],false);
                $user_roles = $rbacreview->assignedRoles($a_user_id);
                
                if (!array_intersect($local_roles,$user_roles))
                {
                        return false;
                }
                
                return true;
        }
} // END class.ilObjiLincCourse
?>