File Source for local.inc.php

<?php
/*
==============================================================================
Dokeos - elearning and course management software
Copyright (c) 2004-2008 Dokeos SPRL
Copyright (c) 2003-2005 Ghent University (UGent)
Copyright (c) 2001 Universite catholique de Louvain (UCL)
Copyright (c) Hugues Peeters
Copyright (c) Roan Embrechts (Vrije Universiteit Brussel)
Copyright (c) Patrick Cool
For a full list of contributors, see "credits.txt".
The full license can be read in "license.txt".
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.
See the GNU General Public License for more details.
Contact address: Dokeos, rue du Corbeau, 108, B-1030 Brussels, Belgium
Mail: info@dokeos.com
==============================================================================
*/
/**
==============================================================================
*
* SCRIPT PURPOSE
*
* This script initializes and manages Dokeos session information. It
* keeps available session information up to date.
*
* You can request a course id. It will check if the course Id requested is the
* same as the current one. If it isn't it will update session information from
* the database. You can also force the course reset if you want ($cidReset).
*
* All the course information is stored in the $_course array.
*
* You can request a group id. The script will check if the group id requested is the
* same as the current one. If it isn't it will update session information from
* the database. You can also force the course reset if you want ($gidReset).
*
The course id is stored in $_cid session variable.
* The group id is stored in $_gid session variable.
*
*
* VARIABLES AFFECTING THE SCRIPT BEHAVIOR
*
* string $login
* string $password
* boolean $logout
*
* string $cidReq : course id requested
* boolean $cidReset : ask for a course Reset, if no $cidReq is provided in the
* same time, all course informations is removed from the
* current session
*
* int $gidReq : group Id requested
* boolean $gidReset : ask for a group Reset, if no $gidReq is provided in the
* same time, all group informations is removed from the
* current session
*
*
* VARIABLES SET AND RETURNED BY THE SCRIPT
*
* All the variables below are set and returned by this script.
*
* USER VARIABLES
*
* string $_user ['firstName' ]
* string $_user ['lastName' ]
* string $_user ['mail' ]
* string $_user ['lastLogin' ]
* string $_user ['official_code']
* string $_user ['picture_uri' ]
* string $_user['user_id']
*
* boolean $is_platformAdmin
* boolean $is_allowedCreateCourse
*
* COURSE VARIABLES
*
* string $_cid (the course id)
*
* int $_course['id' ] - auto-assigned integer
* string $_course['name' ] - the title of the course
* string $_course['official_code'] - the visual / fake / official code
* string $_course['sysCode' ]
* string $_course['path' ]
* string $_course['dbName' ]
* string $_course['dbNameGlu' ]
* string $_course['titular' ]
* string $_course['language' ]
* string $_course['extLink' ]['url' ]
* string $_course['extLink' ]['name']
* string $_course['categoryCode']
* string $_course['categoryName']
* boolean $is_courseMember
* boolean $is_courseTutor
* boolean $is_courseAdmin
*
*
* GROUP VARIABLES
*
* int $_gid (the group id)
*
*
* IMPORTANT ADVICE FOR DEVELOPERS
*
* We strongly encourage developers to use a connection layer at the top of
* their scripts rather than use these variables, as they are, inside the core
* of their scripts. It will make code maintenance much easier.
*
* Many if the functions you need you can already find in the
* main_api.lib.php
*
* We encourage you to use functions to access these global "kernel" variables.
* You can add them to e.g. the main API library.
*
*
* SCRIPT STRUCTURE
*
* 1. The script determines if there is an authentication attempt. This part
* only chek if the login name and password are valid. Afterwards, it set the
* $_user['user_id'] (user id) and the $uidReset flag. Other user informations are retrieved
* later. It's also in this section that optional external authentication
* devices step in.
*
* 2. The script determines what other session informations have to be set or
* reset, setting correctly $cidReset (for course) and $gidReset (for group).
*
* 3. If needed, the script retrieves the other user informations (first name,
* last name, ...) and stores them in session.
*
* 4. If needed, the script retrieves the course information and stores them
* in session
*
* 5. The script initializes the user permission status and permission for the
* course level
*
* 6. If needed, the script retrieves group informations an store them in
* session.
*
* 7. The script initializes the user status and permission for the group level.
*
* @package dokeos.include
==============================================================================
*/
/*
==============================================================================
INIT SECTION
variables should be initialised here
==============================================================================
*/
// parameters passed via GET
$logout = isset($_GET["logout"]) ? $_GET["logout"] : '';
$gidReq = isset($_GET["gidReq"]) ? Database::escape_string($_GET["gidReq"]) : '';
//this fixes some problems with generic functionalities like
//My Agenda & What's New icons linking to courses
// $cidReq can be set in the index.php file of a course-area
$cidReq = isset($cidReq) ? Database::escape_string($cidReq) : '';
// $cidReq can be set in URL-parameter
$cidReq = isset($_GET["cidReq"]) ? Database::escape_string($_GET["cidReq"]) : $cidReq;
$cidReset = isset($cidReset) ? Database::escape_string($cidReset) : '';
// $cidReset can be set in URL-parameter
$cidReset = isset($_GET["cidReq"])&&$_GET["cidReq"]!=$_SESSION['_cid'] ? Database::escape_string($_GET["cidReq"]) : $cidReset;
$gidReset = isset($gidReset) ? $gidReset : '';
// $gidReset can be set in URL-parameter
// parameters passed via POST
$login = isset($_POST["login"]) ? $_POST["login"] : '';
// passed through other means
//$cidReq -- passed from course folder index.php
/*
==============================================================================
MAIN CODE
==============================================================================
*/
if (!empty($_SESSION['_user']['user_id']) && ! ($login || $logout))
{
// uid is in session => login already done, continue with this value
$_user['user_id'] = $_SESSION['_user']['user_id'];
}
else
{
if (isset($_user['user_id'])){ unset($_user['user_id']); }
if(isset($_POST['login']) && isset($_POST['password'])) // $login && $password are given to log in
{
$login = $_POST['login'];
$password = $_POST['password'];
//lookup the user in the main database
$user_table = Database::get_main_table(TABLE_MAIN_USER);
$sql = "SELECT user_id, username, password, auth_source, active, expiration_date
FROM $user_table
WHERE username = '".trim(addslashes($login))."'";
$result = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($result) > 0)
{
$uData = mysql_fetch_array($result);
if ($uData['auth_source'] == PLATFORM_AUTH_SOURCE)
{
//the authentification of this user is managed by Dokeos itself
$password = trim(stripslashes($password));
// determine if the password needs to be encrypted before checking
// $userPasswordCrypted is set in an external configuration file
if ($userPasswordCrypted)
{
$password = md5($password);
}
// check the user's password
if ($password == $uData['password'] AND (trim($login) == $uData['username']))
{
// check if the account is active (not locked)
if ($uData['active']=='1')
{
// check if the expiration date has not been reached
if ($uData['expiration_date']>date('Y-m-d H:i:s') OR $uData['expiration_date']=='0000-00-00 00:00:00')
{
$_user['user_id'] = $uData['user_id'];
api_session_register('_user');
if(!function_exists('event_login')){
include(api_get_path(LIBRARY_PATH)."events.lib.inc.php");
event_login();
}
}
else
{
$loginFailed = true;
api_session_unregister('_uid');
header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=account_expired');
exit;
}
}
else
{
$loginFailed = true;
api_session_unregister('_uid');
header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=account_inactive');
exit;
}
}
else // login failed: username or password incorrect
{
$loginFailed = true;
api_session_unregister('_uid');
header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=user_password_incorrect');
exit;
}
if (isset($uData['creator_id']) && $_user['user_id'] != $uData['creator_id'])
{
//first login for a not self registred
//e.g. registered by a teacher
//do nothing (code may be added later)
}
}
elseif(!empty($extAuthSource[$uData['auth_source']]['login']) && file_exists($extAuthSource[$uData['auth_source']]['login']))
{
/*
* Process external authentication
* on the basis of the given login name
*/
$loginFailed = true; // Default initialisation. It could
// change after the external authentication
$key = $uData['auth_source']; //'ldap','shibboleth'...
/* >>>>>>>> External authentication modules <<<<<<<<< */
// see configuration.php to define these
include_once($extAuthSource[$key]['login']);
/* >>>>>>>> External authentication modules <<<<<<<<< */
}
else // no standard Dokeos login - try external authentification
{
//huh... nothing to do... we shouldn't get here
error_log('Dokeos Authentication file '. $extAuthSource[$uData['auth_source']]['login']. ' could not be found - this might prevent your system from doing the corresponding authentication process',0);
}
if(!empty($_SESSION['request_uri']))
{
$req = $_SESSION['request_uri'];
unset($_SESSION['request_uri']);
header('location: '.$req);
}
else
{
if (isset($param))
{
header('location: '.api_get_path(WEB_PATH).api_get_setting('page_after_login').$param);
}
else
{
header('location: '.api_get_path(WEB_PATH).api_get_setting('page_after_login'));
}
}
}
else // login failed, mysql_num_rows($result) <= 0
{
$loginFailed = true; // Default initialisation. It could
// change after the external authentication
/*
* In this section:
* there is no entry for the $login user in the Dokeos
* database. This also means there is no auth_source for the user.
* We let all external procedures attempt to add him/her
* to the system.
*
* Process external login on the basis
* of the authentication source list
* provided by the configuration settings.
* If the login succeeds, for going further,
* Dokeos needs the $_user['user_id'] variable to be
* set and registered in the session. It's the
* responsability of the external login script
* to provide this $_user['user_id'].
*/
if (is_array($extAuthSource))
{
foreach($extAuthSource as $thisAuthSource)
{
if(!empty($thisAuthSource['newUser']) && file_exists($thisAuthSource['newUser']))
{
include_once($thisAuthSource['newUser']);
}
else
{
error_log('Dokeos Authentication file '. $thisAuthSource['newUser']. ' could not be found - this might prevent your system from using the authentication process in the user creation process',0);
}
}
} //end if is_array($extAuthSource)
} //end else login failed
}
elseif(api_get_setting('openid_authentication')=='true')
{
if(!empty($_POST['openid_url']))
{
include('main/auth/openid/login.php');
openid_begin(trim($_POST['openid_url']),api_get_path(WEB_PATH).'index.php');
//this last function should trigger a redirect, so we can die here safely
die('Openid login redirection should be in progress');
}
elseif(!empty($_GET['openid_identity']))
{ //it's usual for PHP to replace '.' (dot) by '_' (underscore) in URL parameters
include('main/auth/openid/login.php');
$res = openid_complete($_GET);
if($res['status'] == 'success')
{
$id1 = Database::escape_string($res['openid.identity']);
//have another id with or without the final '/'
$id2 = (substr($id1,-1,1)=='/'?substr($id1,0,-1):$id1.'/');
//lookup the user in the main database
$user_table = Database::get_main_table(TABLE_MAIN_USER);
$sql = "SELECT user_id, username, password, auth_source, active, expiration_date
FROM $user_table
WHERE openid = '$id1'
OR openid = '$id2' ";
$result = api_sql_query($sql);
if($result !== false)
{
if(Database::num_rows($result)>0)
{
//$row = Database::fetch_array($res);
$uData = Database::fetch_array($result);
if ($uData['auth_source'] == PLATFORM_AUTH_SOURCE)
{
//the authentification of this user is managed by Dokeos itself
// check if the account is active (not locked)
if ($uData['active']=='1')
{
// check if the expiration date has not been reached
if ($uData['expiration_date']>date('Y-m-d H:i:s') OR $uData['expiration_date']=='0000-00-00 00:00:00')
{
$_user['user_id'] = $uData['user_id'];
api_session_register('_user');
if(!function_exists('event_login')){
include(api_get_path(LIBRARY_PATH)."events.lib.inc.php");
event_login();
}
}
else
{
$loginFailed = true;
api_session_unregister('_uid');
header('Location: index.php?loginFailed=1&error=account_expired');
exit;
}
}
else
{
$loginFailed = true;
api_session_unregister('_uid');
header('Location: index.php?loginFailed=1&error=account_inactive');
exit;
}
if (isset($uData['creator_id']) && $_user['user_id'] != $uData['creator_id'])
{
//first login for a not self registred
//e.g. registered by a teacher
//do nothing (code may be added later)
}
}
}
else
{
//Redirect to the subscription form
header('Location: '.api_get_path(WEB_CODE_PATH).'auth/inscription.php?username='.$res['openid.sreg.nickname'].'&email='.$res['openid.sreg.email'].'&openid='.$res['openid.identity'].'&openid_msg=idnotfound');
//$loginFailed = true;
}
}
else
{
$loginFailed = true;
}
}
else
{
$loginFailed = true;
}
}
}
// else {} => continue as anonymous user
$uidReset = true;
// $cidReset = true;
// $gidReset = true;
}
//Now check for anonymous user mode
if(isset($use_anonymous) && $use_anonymous == true)
{
//if anonymous mode is set, then try to set the current user as anonymous
//if he doesn't have a login yet
api_set_anonymous();
}
else
{
//if anonymous mode is not set, then check if this user is anonymous. If it
//is, clean it from being anonymous (make him a nobody :-))
api_clear_anonymous();
}
// if the requested course is different from the course in session
if (!empty($cidReq) && (!isset($_SESSION['_cid']) or (isset($_SESSION['_cid']) && $cidReq != $_SESSION['_cid'])))
{
$cidReset = true;
$gidReset = true; // As groups depend from courses, group id is reset
}
// if the requested group is different from the group in session
if ($gidReq && $gidReq != $_SESSION['_gid'])
{
$gidReset = true;
}
//////////////////////////////////////////////////////////////////////////////
// USER INIT
//////////////////////////////////////////////////////////////////////////////
if (isset($uidReset) && $uidReset) // session data refresh requested
{
$is_platformAdmin = false; $is_allowedCreateCourse = false;
if (isset($_user['user_id']) && $_user['user_id']) // a uid is given (log in succeeded)
{
$user_table = Database::get_main_table(TABLE_MAIN_USER);
$admin_table = Database::get_main_table(TABLE_MAIN_ADMIN);
if ($_configuration['tracking_enabled'])
{
$sql = "SELECT `user`.*, `a`.`user_id` `is_admin`,
UNIX_TIMESTAMP(`login`.`login_date`) `login_date`
FROM $user_table
LEFT JOIN $admin_table `a`
ON `user`.`user_id` = `a`.`user_id`
LEFT JOIN `".$_configuration['statistics_database']."`.`track_e_login` `login`
ON `user`.`user_id` = `login`.`login_user_id`
WHERE `user`.`user_id` = '".$_user['user_id']."'
ORDER BY `login`.`login_date` DESC LIMIT 1";
}
else
{
$sql = "SELECT `user`.*, `a`.`user_id` `is_admin`
FROM $user_table
LEFT JOIN $admin_table `a`
ON `user`.`user_id` = `a`.`user_id`
WHERE `user`.`user_id` = '".$_user['user_id']."'";
}
$result = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($result) > 0)
{
// Extracting the user data
$uData = mysql_fetch_array($result);
$_user ['firstName'] = $uData ['firstname' ];
$_user ['lastName' ] = $uData ['lastname' ];
$_user ['mail' ] = $uData ['email' ];
$_user ['lastLogin'] = $uData ['login_date'];
$_user ['official_code'] = $uData ['official_code'];
$_user ['picture_uri'] = $uData ['picture_uri'];
$_user ['user_id'] = $uData ['user_id'];
$_user ['language'] = $uData ['language'];
$_user ['auth_source'] = $uData ['auth_source'];
$_user ['theme'] = $uData ['theme'];
$_user ['status'] = $uData ['status'];
$is_platformAdmin = (bool) (! is_null( $uData['is_admin']));
$is_allowedCreateCourse = (bool) ($uData ['status'] == 1);
api_session_register('_user');
}
else
{
header('location:'.api_get_path(WEB_PATH));
//exit("WARNING UNDEFINED UID !! ");
}
}
else // no uid => logout or Anonymous
{
api_session_unregister('_user');
api_session_unregister('_uid');
}
api_session_register('is_platformAdmin');
api_session_register('is_allowedCreateCourse');
}
else // continue with the previous values
{
$_user = $_SESSION['_user'];
$is_platformAdmin = $_SESSION['is_platformAdmin'];
$is_allowedCreateCourse = $_SESSION['is_allowedCreateCourse'];
}
//////////////////////////////////////////////////////////////////////////////
// COURSE INIT
//////////////////////////////////////////////////////////////////////////////
if (isset($cidReset) && $cidReset) // course session data refresh requested or empty data
{
if ($cidReq)
{
$course_table = Database::get_main_table(TABLE_MAIN_COURSE);
$course_cat_table = Database::get_main_table(TABLE_MAIN_CATEGORY);
$sql = "SELECT `course`.*, `course_category`.`code` `faCode`, `course_category`.`name` `faName`
FROM $course_table
LEFT JOIN $course_cat_table
ON `course`.`category_code` = `course_category`.`code`
WHERE `course`.`code` = '$cidReq'";
$result = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($result)>0)
{
$cData = mysql_fetch_array($result);
$_cid = $cData['code' ];
$_course = array();
$_course['id' ] = $cData['code' ]; //auto-assigned integer
$_course['name' ] = $cData['title' ];
$_course['official_code'] = $cData['visual_code' ]; // use in echo
$_course['sysCode' ] = $cData['code' ]; // use as key in db
$_course['path' ] = $cData['directory' ]; // use as key in path
$_course['dbName' ] = $cData['db_name' ]; // use as key in db list
$_course['dbNameGlu' ] = $_configuration['table_prefix'] . $cData['db_name'] . $_configuration['db_glue']; // use in all queries
$_course['titular' ] = $cData['tutor_name' ];
$_course['language' ] = $cData['course_language' ];
$_course['extLink' ]['url' ] = $cData['department_url' ];
$_course['extLink' ]['name'] = $cData['department_name'];
$_course['categoryCode'] = $cData['faCode' ];
$_course['categoryName'] = $cData['faName' ];
$_course['visibility' ] = $cData['visibility'];
$_course['subscribe_allowed'] = $cData['subscribe'];
$_course['unubscribe_allowed'] = $cData['unsubscribe'];
api_session_register('_cid');
api_session_register('_course');
if($_configuration['tracking_enabled'] && !isset($_SESSION['login_as']))
{
//We add a new record in the course tracking table
$course_tracking_table = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
$sql="INSERT INTO $course_tracking_table(course_code, user_id, login_course_date, logout_course_date, counter)" .
"VALUES('".$_course['official_code']."', '".$_user['user_id']."', NOW(), NOW(), '1')";
api_sql_query($sql,__FILE__,__LINE__);
}
// if a session id has been given in url, we store the session
if(api_get_setting('use_session_mode')=='true')
{
// Database Table Definitions
$tbl_session = Database::get_main_table(TABLE_MAIN_SESSION);
$tbl_user = Database::get_main_table(TABLE_MAIN_USER);
$tbl_session_course = Database::get_main_table(TABLE_MAIN_SESSION_COURSE);
$tbl_session_course_user = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
if(!empty($_GET['id_session']))
{
$_SESSION['id_session'] = Database::escape_string($_GET['id_session']);
$sql = 'SELECT name FROM '.$tbl_session . ' WHERE id="'.$_SESSION['id_session'] . '"';
$rs = api_sql_query($sql,__FILE__,__LINE__);
list($_SESSION['session_name']) = mysql_fetch_array($rs);
}
else
{
api_session_unregister('session_name');
api_session_unregister('id_session');
}
}
}
else
{
//exit("WARNING UNDEFINED CID !! ");
header('location:'.api_get_path(WEB_PATH));
}
}
else
{
api_session_unregister('_cid');
api_session_unregister('_course');
}
}
else // continue with the previous values
{
if(empty($_SESSION['_course']) OR empty($_SESSION['_cid']))
{ //no previous values...
$_cid = -1; //set default values that will be caracteristic of being unset
$_course = -1;
}
else
{
$_cid = $_SESSION['_cid' ];
$_course = $_SESSION['_course'];
// these lines are usefull for tracking. Indeed we can have lost the id_session and not the cid.
// Moreover, if we want to track a course with another session it can be usefull
if(!empty($_GET['id_session']))
{
$tbl_session = Database::get_main_table(TABLE_MAIN_SESSION);
$_SESSION['id_session'] = Database::escape_string($_GET['id_session']);
$sql = 'SELECT name FROM '.$tbl_session . ' WHERE id="'.$_SESSION['id_session'] . '"';
$rs = api_sql_query($sql,__FILE__,__LINE__);
list($_SESSION['session_name']) = mysql_fetch_array($rs);
}
if($_configuration['tracking_enabled'] && !isset($_SESSION['login_as']))
{
$course_tracking_table = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
//We select the last record for the current course in the course tracking table
$sql="SELECT course_access_id FROM $course_tracking_table WHERE user_id=".intval($_user ['user_id'])." ORDER BY login_course_date DESC LIMIT 0,1";
$result=api_sql_query($sql,__FILE__,__LINE__);
if(Database::num_rows($result)>0)
{
$i_course_access_id = mysql_result($result,0,0);
//We update the course tracking table
$sql="UPDATE $course_tracking_table " .
"SET logout_course_date = NOW(), " .
"counter = counter+1 " .
"WHERE course_access_id=".intval($i_course_access_id);
api_sql_query($sql,__FILE__,__LINE__);
}
else
{
$sql="INSERT INTO $course_tracking_table(course_code, user_id, login_course_date, logout_course_date, counter)" .
"VALUES('".$_course['official_code']."', '".$_user['user_id']."', NOW(), NOW(), '1')";
api_sql_query($sql,__FILE__,__LINE__);
}
}
}
}
//////////////////////////////////////////////////////////////////////////////
// COURSE / USER REL. INIT
//////////////////////////////////////////////////////////////////////////////
if ((isset($uidReset) && $uidReset) || (isset($cidReset) && $cidReset)) // session data refresh requested
{
if (isset($_user['user_id']) && $_user['user_id'] && isset($_cid) && $_cid) // have keys to search data
{
if(api_get_setting('use_session_mode') != 'true')
{
$course_user_table = Database::get_main_table(TABLE_MAIN_COURSE_USER);
$sql = "SELECT * FROM $course_user_table
WHERE `user_id` = '".$_user['user_id']."'
AND `course_code` = '$cidReq'";
$result = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($result) > 0) // this user have a recorded state for this course
{
$cuData = mysql_fetch_array($result);
$is_courseMember = true;
$is_courseTutor = (bool) ($cuData['tutor_id' ] == 1 );
$is_courseAdmin = (bool) ($cuData['status'] == 1 );
api_session_register('_courseUser');
}
else // this user has no status related to this course
{
$is_courseMember = false;
$is_courseAdmin = false;
$is_courseTutor = false;
}
$is_courseAdmin = (bool) ($is_courseAdmin || $is_platformAdmin);
}
else
{
$tbl_course_user = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
$sql = "SELECT * FROM ".$tbl_course_user."
WHERE `user_id` = '".$_user['user_id']."'
AND `course_code` = '$cidReq'";
$result = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($result) > 0) // this user have a recorded state for this course
{
$cuData = mysql_fetch_array($result);
$_courseUser['role'] = $cuData['role' ];
$is_courseMember = true;
$is_courseTutor = (bool) ($cuData['tutor_id' ] == 1 );
$is_courseAdmin = (bool) ($cuData['status'] == 1 );
api_session_register('_courseUser');
}
if (!$is_courseAdmin) // this user has no status related to this course
{
// is it the session coach or the session admin ?
$tbl_session = Database :: get_main_table(TABLE_MAIN_SESSION);
$tbl_session_course = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE);
$tbl_session_course_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
$sql = "SELECT session.id_coach, session_admin_id
FROM ".$tbl_session." as session
INNER JOIN ".$tbl_session_course."
ON session_rel_course.id_session = session.id
AND session_rel_course.course_code='$_cid'";
$result = api_sql_query($sql,__FILE__,__LINE__);
$row = api_store_result($result);
if($row[0]['id_coach']==$_user['user_id']){
$_courseUser['role'] = 'Professor';
$is_courseMember = true;
$is_courseTutor = true;
$is_courseAdmin = false;
$is_courseCoach = true;
$is_sessionAdmin = false;
api_session_register('_courseUser');
}
else if($row[0]['session_admin_id']==$_user['user_id']){
$_courseUser['role'] = 'Professor';
$is_courseMember = false;
$is_courseTutor = false;
$is_courseAdmin = false;
$is_courseCoach = false;
$is_sessionAdmin = true;
}
else
{
// Check if the current user is the course coach
$sql = "SELECT 1
FROM ".$tbl_session_course."
WHERE session_rel_course.course_code='$_cid'
AND session_rel_course.id_coach = '".$_user['user_id']."'";
$result = api_sql_query($sql,__FILE__,__LINE__);
if($row = mysql_fetch_array($result))
{
$_courseUser['role'] = 'Professor';
$is_courseMember = true;
$is_courseTutor = true;
$is_courseCoach = true;
$is_sessionAdmin = false;
$tbl_user = Database :: get_main_table(TABLE_MAIN_USER);
$sql="SELECT status FROM ".$tbl_user." WHERE user_id = ".$_user['user_id']."";
$result=api_sql_query($sql);
if(mysql_result($result,0,0)==1){
$is_courseAdmin = true;
}
else{
$is_courseAdmin = false;
}
api_session_register('_courseUser');
}
else
{
// Check if the user is a student is this session
$sql = "SELECT * FROM ".$tbl_session_course_user."
WHERE `id_user` = '".$_user['user_id']."'
AND `course_code` = '$cidReq'";
$result = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($result) > 0) // this user have a recorded state for this course
{
while($row = mysql_fetch_array($result)){
$is_courseMember = true;
$is_courseTutor = false;
$is_courseAdmin = false;
$is_sessionAdmin = false;
api_session_register('_courseUser');
}
}
}
}
}
}
}
else // keys missing => not anymore in the course - user relation
{
//// course
$is_courseMember = false;
$is_courseAdmin = false;
$is_courseTutor = false;
$is_courseCoach = false;
$is_sessionAdmin = false;
api_session_unregister('_courseUser');
}
//DEPRECATED
//$is_courseAllowed=($_cid && ($_course['visibility'] || $is_courseMember || $is_platformAdmin))?true:false;
//NEW
if (isset($_course))
{
if ($_course['visibility'] == COURSE_VISIBILITY_OPEN_WORLD)
$is_allowed_in_course = true;
elseif ($_course['visibility'] == COURSE_VISIBILITY_OPEN_PLATFORM && isset($_user['user_id']) )
$is_allowed_in_course = true;
elseif ($_course['visibility'] == COURSE_VISIBILITY_REGISTERED && ($is_platformAdmin || $is_courseMember))
$is_allowed_in_course = true;
elseif ($_course['visibility'] == COURSE_VISIBILITY_CLOSED && ($is_platformAdmin || $is_courseAdmin))
$is_allowed_in_course = true;
else $is_allowed_in_course = false;
}
// save the states
api_session_register('is_courseMember');
api_session_register('is_courseAdmin');
//api_session_register('is_courseAllowed'); //deprecated old permission var
api_session_register('is_courseTutor');
api_session_register('is_allowed_in_course'); //new permission var
api_session_register('is_courseCoach');
api_session_register('is_sessionAdmin');
}
else // continue with the previous values
{
if (isset($_SESSION ['_courseUser']))
{
$_courseUser = $_SESSION ['_courseUser'];
}
$is_courseMember = $_SESSION ['is_courseMember' ];
$is_courseAdmin = $_SESSION ['is_courseAdmin' ];
//$is_courseAllowed = $_SESSION ['is_courseAllowed']; //deprecated
$is_allowed_in_course = $_SESSION ['is_allowed_in_course'];
$is_courseTutor = $_SESSION ['is_courseTutor' ];
$is_courseCoach = $_SESSION ['is_courseCoach' ];
}
//////////////////////////////////////////////////////////////////////////////
// GROUP INIT
//////////////////////////////////////////////////////////////////////////////
if ((isset($gidReset) && $gidReset) || (isset($cidReset) && $cidReset)) // session data refresh requested
{
if ($gidReq && $_cid ) // have keys to search data
{
$group_table = Database::get_course_table(TABLE_GROUP);
$sql = "SELECT * FROM $group_table WHERE `id` = '$gidReq'";
$result = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($result) > 0) // This group has recorded status related to this course
{
$gpData = mysql_fetch_array($result);
$_gid = $gpData ['id' ];
api_session_register('_gid');
}
else
{
exit("WARNING UNDEFINED GID !! ");
}
}
elseif(isset($_SESSION['_gid']) or isset($_gid)) // Keys missing => not anymore in the group - course relation
{
api_session_unregister('_gid');
}
}
elseif(isset($_SESSION['_gid'])) // continue with the previous values
{
$_gid = $_SESSION ['_gid' ];
}
else
{ //if no previous value, assign caracteristic undefined value
$_gid = -1;
}
//set variable according to student_view_enabled choices
if (api_get_setting('student_view_enabled') == "true")
{
if (isset($_GET['isStudentView']))
{
if ($_GET['isStudentView'] == 'true')
{
if (isset($_SESSION['studentview']))
{
if (!empty($_SESSION['studentview']))
// switching to studentview
$_SESSION['studentview'] = 'studentview';
}
}
elseif ($_GET['isStudentView'] == 'false')
{
if (isset($_SESSION['studentview']))
{
if (!empty($_SESSION['studentview']))
// switching to teacherview
$_SESSION['studentview'] = 'teacherview';
}
}
}
elseif (!empty($_SESSION['studentview']))
{
//all is fine, no change to that, obviously
}
elseif (empty($_SESSION['studentview']))
{
// We are in teacherview here
$_SESSION['studentview'] = 'teacherview';
}
}
if(isset($_cid))
{
$tbl_course = Database::get_main_table(TABLE_MAIN_COURSE);
$sql="UPDATE $tbl_course SET last_visit=NOW() WHERE code='$_cid'";
api_sql_query($sql,__FILE__,__LINE__);
}

Source for file local.inc.php