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enrollib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* This library includes the basic parts of enrol api.
* It is available on each page.
*
* @package core
* @subpackage enrol
* @copyright 2010 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/** Course enrol instance enabled. (used in enrol->status) */
define('ENROL_INSTANCE_ENABLED', 0);
/** Course enrol instance disabled, user may enter course if other enrol instance enabled. (used in enrol->status)*/
define('ENROL_INSTANCE_DISABLED', 1);
/** User is active participant (used in user_enrolments->status)*/
define('ENROL_USER_ACTIVE', 0);
/** User participation in course is suspended (used in user_enrolments->status) */
define('ENROL_USER_SUSPENDED', 1);
/** @deprecated - enrol caching was reworked, use ENROL_MAX_TIMESTAMP instead */
define('ENROL_REQUIRE_LOGIN_CACHE_PERIOD', 1800);
/** The timestamp indicating forever */
define('ENROL_MAX_TIMESTAMP', 2147483647);
/** When user disappears from external source, the enrolment is completely removed */
define('ENROL_EXT_REMOVED_UNENROL', 0);
/** When user disappears from external source, the enrolment is kept as is - one way sync */
define('ENROL_EXT_REMOVED_KEEP', 1);
/** @deprecated since 2.4 not used any more, migrate plugin to new restore methods */
define('ENROL_RESTORE_TYPE', 'enrolrestore');
/**
* When user disappears from external source, user enrolment is suspended, roles are kept as is.
* In some cases user needs a role with some capability to be visible in UI - suc has in gradebook,
* assignments, etc.
*/
define('ENROL_EXT_REMOVED_SUSPEND', 2);
/**
* When user disappears from external source, the enrolment is suspended and roles assigned
* by enrol instance are removed. Please note that user may "disappear" from gradebook and other areas.
* */
define('ENROL_EXT_REMOVED_SUSPENDNOROLES', 3);
/**
* Returns instances of enrol plugins
* @param bool $enabled return enabled only
* @return array of enrol plugins name=>instance
*/
function enrol_get_plugins($enabled) {
global $CFG;
$result = array();
if ($enabled) {
// sorted by enabled plugin order
$enabled = explode(',', $CFG->enrol_plugins_enabled);
$plugins = array();
foreach ($enabled as $plugin) {
$plugins[$plugin] = "$CFG->dirroot/enrol/$plugin";
}
} else {
// sorted alphabetically
$plugins = get_plugin_list('enrol');
ksort($plugins);
}
foreach ($plugins as $plugin=>$location) {
if (!file_exists("$location/lib.php")) {
continue;
}
include_once("$location/lib.php");
$class = "enrol_{$plugin}_plugin";
if (!class_exists($class)) {
continue;
}
$result[$plugin] = new $class();
}
return $result;
}
/**
* Returns instance of enrol plugin
* @param string $name name of enrol plugin ('manual', 'guest', ...)
* @return enrol_plugin
*/
function enrol_get_plugin($name) {
global $CFG;
$name = clean_param($name, PARAM_PLUGIN);
if (empty($name)) {
// ignore malformed or missing plugin names completely
return null;
}
$location = "$CFG->dirroot/enrol/$name";
if (!file_exists("$location/lib.php")) {
return null;
}
include_once("$location/lib.php");
$class = "enrol_{$name}_plugin";
if (!class_exists($class)) {
return null;
}
return new $class();
}
/**
* Returns enrolment instances in given course.
* @param int $courseid
* @param bool $enabled
* @return array of enrol instances
*/
function enrol_get_instances($courseid, $enabled) {
global $DB, $CFG;
if (!$enabled) {
return $DB->get_records('enrol', array('courseid'=>$courseid), 'sortorder,id');
}
$result = $DB->get_records('enrol', array('courseid'=>$courseid, 'status'=>ENROL_INSTANCE_ENABLED), 'sortorder,id');
$enabled = explode(',', $CFG->enrol_plugins_enabled);
foreach ($result as $key=>$instance) {
if (!in_array($instance->enrol, $enabled)) {
unset($result[$key]);
continue;
}
if (!file_exists("$CFG->dirroot/enrol/$instance->enrol/lib.php")) {
// broken plugin
unset($result[$key]);
continue;
}
}
return $result;
}
/**
* Checks if a given plugin is in the list of enabled enrolment plugins.
*
* @param string $enrol Enrolment plugin name
* @return boolean Whether the plugin is enabled
*/
function enrol_is_enabled($enrol) {
global $CFG;
if (empty($CFG->enrol_plugins_enabled)) {
return false;
}
return in_array($enrol, explode(',', $CFG->enrol_plugins_enabled));
}
/**
* Check all the login enrolment information for the given user object
* by querying the enrolment plugins
*
* This function may be very slow, use only once after log-in or login-as.
*
* @param stdClass $user
* @return void
*/
function enrol_check_plugins($user) {
global $CFG;
if (empty($user->id) or isguestuser($user)) {
// shortcut - there is no enrolment work for guests and not-logged-in users
return;
}
// originally there was a broken admin test, but accidentally it was non-functional in 2.2,
// which proved it was actually not necessary.
static $inprogress = array(); // To prevent this function being called more than once in an invocation
if (!empty($inprogress[$user->id])) {
return;
}
$inprogress[$user->id] = true; // Set the flag
$enabled = enrol_get_plugins(true);
foreach($enabled as $enrol) {
$enrol->sync_user_enrolments($user);
}
unset($inprogress[$user->id]); // Unset the flag
}
/**
* Do these two students share any course?
*
* The courses has to be visible and enrolments has to be active,
* timestart and timeend restrictions are ignored.
*
* This function calls {@see enrol_get_shared_courses()} setting checkexistsonly
* to true.
*
* @param stdClass|int $user1
* @param stdClass|int $user2
* @return bool
*/
function enrol_sharing_course($user1, $user2) {
return enrol_get_shared_courses($user1, $user2, false, true);
}
/**
* Returns any courses shared by the two users
*
* The courses has to be visible and enrolments has to be active,
* timestart and timeend restrictions are ignored.
*
* @global moodle_database $DB
* @param stdClass|int $user1
* @param stdClass|int $user2
* @param bool $preloadcontexts If set to true contexts for the returned courses
* will be preloaded.
* @param bool $checkexistsonly If set to true then this function will return true
* if the users share any courses and false if not.
* @return array|bool An array of courses that both users are enrolled in OR if
* $checkexistsonly set returns true if the users share any courses
* and false if not.
*/
function enrol_get_shared_courses($user1, $user2, $preloadcontexts = false, $checkexistsonly = false) {
global $DB, $CFG;
$user1 = isset($user1->id) ? $user1->id : $user1;
$user2 = isset($user2->id) ? $user2->id : $user2;
if (empty($user1) or empty($user2)) {
return false;
}
if (!$plugins = explode(',', $CFG->enrol_plugins_enabled)) {
return false;
}
list($plugins, $params) = $DB->get_in_or_equal($plugins, SQL_PARAMS_NAMED, 'ee');
$params['enabled'] = ENROL_INSTANCE_ENABLED;
$params['active1'] = ENROL_USER_ACTIVE;
$params['active2'] = ENROL_USER_ACTIVE;
$params['user1'] = $user1;
$params['user2'] = $user2;
$ctxselect = '';
$ctxjoin = '';
if ($preloadcontexts) {
list($ctxselect, $ctxjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
}
$sql = "SELECT c.* $ctxselect
FROM {course} c
JOIN (
SELECT DISTINCT c.id
FROM {enrol} e
JOIN {user_enrolments} ue1 ON (ue1.enrolid = e.id AND ue1.status = :active1 AND ue1.userid = :user1)
JOIN {user_enrolments} ue2 ON (ue2.enrolid = e.id AND ue2.status = :active2 AND ue2.userid = :user2)
JOIN {course} c ON (c.id = e.courseid AND c.visible = 1)
WHERE e.status = :enabled AND e.enrol $plugins
) ec ON ec.id = c.id
$ctxjoin";
if ($checkexistsonly) {
return $DB->record_exists_sql($sql, $params);
} else {
$courses = $DB->get_records_sql($sql, $params);
if ($preloadcontexts) {
array_map('context_instance_preload', $courses);
}
return $courses;
}
}
/**
* This function adds necessary enrol plugins UI into the course edit form.
*
* @param MoodleQuickForm $mform
* @param object $data course edit form data
* @param object $context context of existing course or parent category if course does not exist
* @return void
*/
function enrol_course_edit_form(MoodleQuickForm $mform, $data, $context) {
$plugins = enrol_get_plugins(true);
if (!empty($data->id)) {
$instances = enrol_get_instances($data->id, false);
foreach ($instances as $instance) {
if (!isset($plugins[$instance->enrol])) {
continue;
}
$plugin = $plugins[$instance->enrol];
$plugin->course_edit_form($instance, $mform, $data, $context);
}
} else {
foreach ($plugins as $plugin) {
$plugin->course_edit_form(NULL, $mform, $data, $context);
}
}
}
/**
* Validate course edit form data
*
* @param array $data raw form data
* @param object $context context of existing course or parent category if course does not exist
* @return array errors array
*/
function enrol_course_edit_validation(array $data, $context) {
$errors = array();
$plugins = enrol_get_plugins(true);
if (!empty($data['id'])) {
$instances = enrol_get_instances($data['id'], false);
foreach ($instances as $instance) {
if (!isset($plugins[$instance->enrol])) {
continue;
}
$plugin = $plugins[$instance->enrol];
$errors = array_merge($errors, $plugin->course_edit_validation($instance, $data, $context));
}
} else {
foreach ($plugins as $plugin) {
$errors = array_merge($errors, $plugin->course_edit_validation(NULL, $data, $context));
}
}
return $errors;
}
/**
* Update enrol instances after course edit form submission
* @param bool $inserted true means new course added, false course already existed
* @param object $course
* @param object $data form data
* @return void
*/
function enrol_course_updated($inserted, $course, $data) {
global $DB, $CFG;
$plugins = enrol_get_plugins(true);
foreach ($plugins as $plugin) {
$plugin->course_updated($inserted, $course, $data);
}
}
/**
* Add navigation nodes
* @param navigation_node $coursenode
* @param object $course
* @return void
*/
function enrol_add_course_navigation(navigation_node $coursenode, $course) {
global $CFG;
$coursecontext = context_course::instance($course->id);
$instances = enrol_get_instances($course->id, true);
$plugins = enrol_get_plugins(true);
// we do not want to break all course pages if there is some borked enrol plugin, right?
foreach ($instances as $k=>$instance) {
if (!isset($plugins[$instance->enrol])) {
unset($instances[$k]);
}
}
$usersnode = $coursenode->add(get_string('users'), null, navigation_node::TYPE_CONTAINER, null, 'users');
if ($course->id != SITEID) {
// list all participants - allows assigning roles, groups, etc.
if (has_capability('moodle/course:enrolreview', $coursecontext)) {
$url = new moodle_url('/enrol/users.php', array('id'=>$course->id));
$usersnode->add(get_string('enrolledusers', 'enrol'), $url, navigation_node::TYPE_SETTING, null, 'review', new pix_icon('i/enrolusers', ''));
}
// manage enrol plugin instances
if (has_capability('moodle/course:enrolconfig', $coursecontext) or has_capability('moodle/course:enrolreview', $coursecontext)) {
$url = new moodle_url('/enrol/instances.php', array('id'=>$course->id));
} else {
$url = NULL;
}
$instancesnode = $usersnode->add(get_string('enrolmentinstances', 'enrol'), $url, navigation_node::TYPE_SETTING, null, 'manageinstances');
// each instance decides how to configure itself or how many other nav items are exposed
foreach ($instances as $instance) {
if (!isset($plugins[$instance->enrol])) {
continue;
}
$plugins[$instance->enrol]->add_course_navigation($instancesnode, $instance);
}
if (!$url) {
$instancesnode->trim_if_empty();
}
}
// Manage groups in this course or even frontpage
if (($course->groupmode || !$course->groupmodeforce) && has_capability('moodle/course:managegroups', $coursecontext)) {
$url = new moodle_url('/group/index.php', array('id'=>$course->id));
$usersnode->add(get_string('groups'), $url, navigation_node::TYPE_SETTING, null, 'groups', new pix_icon('i/group', ''));
}
if (has_any_capability(array( 'moodle/role:assign', 'moodle/role:safeoverride','moodle/role:override', 'moodle/role:review'), $coursecontext)) {
// Override roles
if (has_capability('moodle/role:review', $coursecontext)) {
$url = new moodle_url('/admin/roles/permissions.php', array('contextid'=>$coursecontext->id));
} else {
$url = NULL;
}
$permissionsnode = $usersnode->add(get_string('permissions', 'role'), $url, navigation_node::TYPE_SETTING, null, 'override');
// Add assign or override roles if allowed
if ($course->id == SITEID or (!empty($CFG->adminsassignrolesincourse) and is_siteadmin())) {
if (has_capability('moodle/role:assign', $coursecontext)) {
$url = new moodle_url('/admin/roles/assign.php', array('contextid'=>$coursecontext->id));
$permissionsnode->add(get_string('assignedroles', 'role'), $url, navigation_node::TYPE_SETTING, null, 'roles', new pix_icon('i/assignroles', ''));
}
}
// Check role permissions
if (has_any_capability(array('moodle/role:assign', 'moodle/role:safeoverride','moodle/role:override', 'moodle/role:assign'), $coursecontext)) {
$url = new moodle_url('/admin/roles/check.php', array('contextid'=>$coursecontext->id));
$permissionsnode->add(get_string('checkpermissions', 'role'), $url, navigation_node::TYPE_SETTING, null, 'permissions', new pix_icon('i/checkpermissions', ''));
}
}
// Deal somehow with users that are not enrolled but still got a role somehow
if ($course->id != SITEID) {
//TODO, create some new UI for role assignments at course level
if (has_capability('moodle/role:assign', $coursecontext)) {
$url = new moodle_url('/enrol/otherusers.php', array('id'=>$course->id));
$usersnode->add(get_string('notenrolledusers', 'enrol'), $url, navigation_node::TYPE_SETTING, null, 'otherusers', new pix_icon('i/assignroles', ''));
}
}
// just in case nothing was actually added
$usersnode->trim_if_empty();
if ($course->id != SITEID) {
if (isguestuser() or !isloggedin()) {
// guest account can not be enrolled - no links for them
} else if (is_enrolled($coursecontext)) {
// unenrol link if possible
foreach ($instances as $instance) {
if (!isset($plugins[$instance->enrol])) {
continue;
}
$plugin = $plugins[$instance->enrol];
if ($unenrollink = $plugin->get_unenrolself_link($instance)) {
$shortname = format_string($course->shortname, true, array('context' => $coursecontext));
$coursenode->add(get_string('unenrolme', 'core_enrol', $shortname), $unenrollink, navigation_node::TYPE_SETTING, null, 'unenrolself', new pix_icon('i/user', ''));
break;
//TODO. deal with multiple unenrol links - not likely case, but still...
}
}
} else {
// enrol link if possible
if (is_viewing($coursecontext)) {
// better not show any enrol link, this is intended for managers and inspectors
} else {
foreach ($instances as $instance) {
if (!isset($plugins[$instance->enrol])) {
continue;
}
$plugin = $plugins[$instance->enrol];
if ($plugin->show_enrolme_link($instance)) {
$url = new moodle_url('/enrol/index.php', array('id'=>$course->id));
$shortname = format_string($course->shortname, true, array('context' => $coursecontext));
$coursenode->add(get_string('enrolme', 'core_enrol', $shortname), $url, navigation_node::TYPE_SETTING, null, 'enrolself', new pix_icon('i/user', ''));
break;
}
}
}
}
}
}
/**
* Returns list of courses current $USER is enrolled in and can access
*
* - $fields is an array of field names to ADD
* so name the fields you really need, which will
* be added and uniq'd
*
* @param string|array $fields
* @param string $sort
* @param int $limit max number of courses
* @return array
*/
function enrol_get_my_courses($fields = NULL, $sort = 'visible DESC,sortorder ASC', $limit = 0) {
global $DB, $USER;
// Guest account does not have any courses
if (isguestuser() or !isloggedin()) {
return(array());
}
$basefields = array('id', 'category', 'sortorder',
'shortname', 'fullname', 'idnumber',
'startdate', 'visible',
'groupmode', 'groupmodeforce');
if (empty($fields)) {
$fields = $basefields;
} else if (is_string($fields)) {
// turn the fields from a string to an array
$fields = explode(',', $fields);
$fields = array_map('trim', $fields);
$fields = array_unique(array_merge($basefields, $fields));
} else if (is_array($fields)) {
$fields = array_unique(array_merge($basefields, $fields));
} else {
throw new coding_exception('Invalid $fileds parameter in enrol_get_my_courses()');
}
if (in_array('*', $fields)) {
$fields = array('*');
}
$orderby = "";
$sort = trim($sort);
if (!empty($sort)) {
$rawsorts = explode(',', $sort);
$sorts = array();
foreach ($rawsorts as $rawsort) {
$rawsort = trim($rawsort);
if (strpos($rawsort, 'c.') === 0) {
$rawsort = substr($rawsort, 2);
}
$sorts[] = trim($rawsort);
}
$sort = 'c.'.implode(',c.', $sorts);
$orderby = "ORDER BY $sort";
}
$wheres = array("c.id <> :siteid");
$params = array('siteid'=>SITEID);
if (isset($USER->loginascontext) and $USER->loginascontext->contextlevel == CONTEXT_COURSE) {
// list _only_ this course - anything else is asking for trouble...
$wheres[] = "courseid = :loginas";
$params['loginas'] = $USER->loginascontext->instanceid;
}
$coursefields = 'c.' .join(',c.', $fields);
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$wheres = implode(" AND ", $wheres);
//note: we can not use DISTINCT + text fields due to Oracle and MS limitations, that is why we have the subselect there
$sql = "SELECT $coursefields $ccselect
FROM {course} c
JOIN (SELECT DISTINCT e.courseid
FROM {enrol} e
JOIN {user_enrolments} ue ON (ue.enrolid = e.id AND ue.userid = :userid)
WHERE ue.status = :active AND e.status = :enabled AND ue.timestart < :now1 AND (ue.timeend = 0 OR ue.timeend > :now2)
) en ON (en.courseid = c.id)
$ccjoin
WHERE $wheres
$orderby";
$params['userid'] = $USER->id;
$params['active'] = ENROL_USER_ACTIVE;
$params['enabled'] = ENROL_INSTANCE_ENABLED;
$params['now1'] = round(time(), -2); // improves db caching
$params['now2'] = $params['now1'];
$courses = $DB->get_records_sql($sql, $params, 0, $limit);
// preload contexts and check visibility
foreach ($courses as $id=>$course) {
context_instance_preload($course);
if (!$course->visible) {
if (!$context = context_course::instance($id, IGNORE_MISSING)) {
unset($courses[$id]);
continue;
}
if (!has_capability('moodle/course:viewhiddencourses', $context)) {
unset($courses[$id]);
continue;
}
}
$courses[$id] = $course;
}
//wow! Is that really all? :-D
return $courses;
}
/**
* Returns course enrolment information icons.
*
* @param object $course
* @param array $instances enrol instances of this course, improves performance
* @return array of pix_icon
*/
function enrol_get_course_info_icons($course, array $instances = NULL) {
$icons = array();
if (is_null($instances)) {
$instances = enrol_get_instances($course->id, true);
}
$plugins = enrol_get_plugins(true);
foreach ($plugins as $name => $plugin) {
$pis = array();
foreach ($instances as $instance) {
if ($instance->status != ENROL_INSTANCE_ENABLED or $instance->courseid != $course->id) {
debugging('Invalid instances parameter submitted in enrol_get_info_icons()');
continue;
}
if ($instance->enrol == $name) {
$pis[$instance->id] = $instance;
}
}
if ($pis) {
$icons = array_merge($icons, $plugin->get_info_icons($pis));
}
}
return $icons;
}
/**
* Returns course enrolment detailed information.
*
* @param object $course
* @return array of html fragments - can be used to construct lists
*/
function enrol_get_course_description_texts($course) {
$lines = array();
$instances = enrol_get_instances($course->id, true);
$plugins = enrol_get_plugins(true);
foreach ($instances as $instance) {
if (!isset($plugins[$instance->enrol])) {
//weird
continue;
}
$plugin = $plugins[$instance->enrol];
$text = $plugin->get_description_text($instance);
if ($text !== NULL) {
$lines[] = $text;
}
}
return $lines;
}
/**
* Returns list of courses user is enrolled into.
* (Note: use enrol_get_all_users_courses if you want to use the list wihtout any cap checks )
*
* - $fields is an array of fieldnames to ADD
* so name the fields you really need, which will
* be added and uniq'd
*
* @param int $userid
* @param bool $onlyactive return only active enrolments in courses user may see
* @param string|array $fields
* @param string $sort
* @return array
*/
function enrol_get_users_courses($userid, $onlyactive = false, $fields = NULL, $sort = 'visible DESC,sortorder ASC') {
global $DB;
$courses = enrol_get_all_users_courses($userid, $onlyactive, $fields, $sort);
// preload contexts and check visibility
if ($onlyactive) {
foreach ($courses as $id=>$course) {
context_instance_preload($course);
if (!$course->visible) {
if (!$context = context_course::instance($id)) {
unset($courses[$id]);
continue;
}
if (!has_capability('moodle/course:viewhiddencourses', $context, $userid)) {
unset($courses[$id]);
continue;
}
}
}
}
return $courses;
}
/**
* Can user access at least one enrolled course?
*
* Cheat if necessary, but find out as fast as possible!
*
* @param int|stdClass $user null means use current user
* @return bool
*/
function enrol_user_sees_own_courses($user = null) {
global $USER;
if ($user === null) {
$user = $USER;
}
$userid = is_object($user) ? $user->id : $user;
// Guest account does not have any courses
if (isguestuser($userid) or empty($userid)) {
return false;
}
// Let's cheat here if this is the current user,
// if user accessed any course recently, then most probably
// we do not need to query the database at all.
if ($USER->id == $userid) {
if (!empty($USER->enrol['enrolled'])) {
foreach ($USER->enrol['enrolled'] as $until) {
if ($until > time()) {
return true;
}
}
}
}
// Now the slow way.
$courses = enrol_get_all_users_courses($userid, true);
foreach($courses as $course) {
if ($course->visible) {
return true;
}
context_helper::preload_from_record($course);
$context = context_course::instance($course->id);
if (has_capability('moodle/course:viewhiddencourses', $context, $user)) {
return true;
}
}
return false;
}
/**
* Returns list of courses user is enrolled into without any capability checks
* - $fields is an array of fieldnames to ADD
* so name the fields you really need, which will
* be added and uniq'd
*
* @param int $userid
* @param bool $onlyactive return only active enrolments in courses user may see
* @param string|array $fields
* @param string $sort
* @return array
*/
function enrol_get_all_users_courses($userid, $onlyactive = false, $fields = NULL, $sort = 'visible DESC,sortorder ASC') {
global $DB;
// Guest account does not have any courses
if (isguestuser($userid) or empty($userid)) {
return(array());
}
$basefields = array('id', 'category', 'sortorder',
'shortname', 'fullname', 'idnumber',
'startdate', 'visible',
'groupmode', 'groupmodeforce');
if (empty($fields)) {
$fields = $basefields;
} else if (is_string($fields)) {
// turn the fields from a string to an array
$fields = explode(',', $fields);
$fields = array_map('trim', $fields);
$fields = array_unique(array_merge($basefields, $fields));
} else if (is_array($fields)) {
$fields = array_unique(array_merge($basefields, $fields));
} else {
throw new coding_exception('Invalid $fileds parameter in enrol_get_my_courses()');
}
if (in_array('*', $fields)) {
$fields = array('*');
}
$orderby = "";
$sort = trim($sort);
if (!empty($sort)) {
$rawsorts = explode(',', $sort);
$sorts = array();
foreach ($rawsorts as $rawsort) {
$rawsort = trim($rawsort);
if (strpos($rawsort, 'c.') === 0) {
$rawsort = substr($rawsort, 2);
}
$sorts[] = trim($rawsort);
}
$sort = 'c.'.implode(',c.', $sorts);
$orderby = "ORDER BY $sort";
}
$params = array('siteid'=>SITEID);
if ($onlyactive) {
$subwhere = "WHERE ue.status = :active AND e.status = :enabled AND ue.timestart < :now1 AND (ue.timeend = 0 OR ue.timeend > :now2)";
$params['now1'] = round(time(), -2); // improves db caching
$params['now2'] = $params['now1'];
$params['active'] = ENROL_USER_ACTIVE;
$params['enabled'] = ENROL_INSTANCE_ENABLED;
} else {
$subwhere = "";
}
$coursefields = 'c.' .join(',c.', $fields);
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
//note: we can not use DISTINCT + text fields due to Oracle and MS limitations, that is why we have the subselect there
$sql = "SELECT $coursefields $ccselect
FROM {course} c
JOIN (SELECT DISTINCT e.courseid
FROM {enrol} e
JOIN {user_enrolments} ue ON (ue.enrolid = e.id AND ue.userid = :userid)
$subwhere
) en ON (en.courseid = c.id)
$ccjoin
WHERE c.id <> :siteid
$orderby";
$params['userid'] = $userid;
$courses = $DB->get_records_sql($sql, $params);
return $courses;
}
/**
* Called when user is about to be deleted.
* @param object $user
* @return void
*/
function enrol_user_delete($user) {
global $DB;
$plugins = enrol_get_plugins(true);
foreach ($plugins as $plugin) {
$plugin->user_delete($user);
}
// force cleanup of all broken enrolments
$DB->delete_records('user_enrolments', array('userid'=>$user->id));
}
/**
* Called when course is about to be deleted.
* @param stdClass $course
* @return void
*/
function enrol_course_delete($course) {
global $DB;
$instances = enrol_get_instances($course->id, false);
$plugins = enrol_get_plugins(true);
foreach ($instances as $instance) {
if (isset($plugins[$instance->enrol])) {
$plugins[$instance->enrol]->delete_instance($instance);
}
// low level delete in case plugin did not do it
$DB->delete_records('user_enrolments', array('enrolid'=>$instance->id));
$DB->delete_records('role_assignments', array('itemid'=>$instance->id, 'component'=>'enrol_'.$instance->enrol));
$DB->delete_records('user_enrolments', array('enrolid'=>$instance->id));
$DB->delete_records('enrol', array('id'=>$instance->id));
}
}
/**
* Try to enrol user via default internal auth plugin.
*
* For now this is always using the manual enrol plugin...
*
* @param $courseid
* @param $userid
* @param $roleid
* @param $timestart
* @param $timeend
* @return bool success
*/
function enrol_try_internal_enrol($courseid, $userid, $roleid = null, $timestart = 0, $timeend = 0) {
global $DB;
//note: this is hardcoded to manual plugin for now
if (!enrol_is_enabled('manual')) {
return false;
}
if (!$enrol = enrol_get_plugin('manual')) {
return false;
}
if (!$instances = $DB->get_records('enrol', array('enrol'=>'manual', 'courseid'=>$courseid, 'status'=>ENROL_INSTANCE_ENABLED), 'sortorder,id ASC')) {
return false;
}
$instance = reset($instances);
$enrol->enrol_user($instance, $userid, $roleid, $timestart, $timeend);
return true;
}
/**
* Is there a chance users might self enrol
* @param int $courseid
* @return bool
*/
function enrol_selfenrol_available($courseid) {
$result = false;
$plugins = enrol_get_plugins(true);
$enrolinstances = enrol_get_instances($courseid, true);
foreach($enrolinstances as $instance) {
if (!isset($plugins[$instance->enrol])) {
continue;
}
if ($instance->enrol === 'guest') {
// blacklist known temporary guest plugins
continue;
}
if ($plugins[$instance->enrol]->show_enrolme_link($instance)) {
$result = true;
break;
}
}
return $result;
}
/**
* This function returns the end of current active user enrolment.
*
* It deals correctly with multiple overlapping user enrolments.
*
* @param int $courseid
* @param int $userid
* @return int|bool timestamp when active enrolment ends, false means no active enrolment now, 0 means never
*/
function enrol_get_enrolment_end($courseid, $userid) {
global $DB;
$sql = "SELECT ue.*
FROM {user_enrolments} ue
JOIN {enrol} e ON (e.id = ue.enrolid AND e.courseid = :courseid)
JOIN {user} u ON u.id = ue.userid
WHERE ue.userid = :userid AND ue.status = :active AND e.status = :enabled AND u.deleted = 0";
$params = array('enabled'=>ENROL_INSTANCE_ENABLED, 'active'=>ENROL_USER_ACTIVE, 'userid'=>$userid, 'courseid'=>$courseid);
if (!$enrolments = $DB->get_records_sql($sql, $params)) {
return false;
}
$changes = array();
foreach ($enrolments as $ue) {
$start = (int)$ue->timestart;
$end = (int)$ue->timeend;
if ($end != 0 and $end < $start) {
debugging('Invalid enrolment start or end in user_enrolment id:'.$ue->id);
continue;
}
if (isset($changes[$start])) {
$changes[$start] = $changes[$start] + 1;
} else {
$changes[$start] = 1;
}
if ($end === 0) {
// no end
} else if (isset($changes[$end])) {
$changes[$end] = $changes[$end] - 1;
} else {
$changes[$end] = -1;
}
}