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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/>.
/**
* Meta course enrolment plugin.
*
* @package enrol_meta
* @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();
/**
* ENROL_META_CREATE_GROUP constant for automatically creating a group for a meta course.
*/
define('ENROL_META_CREATE_GROUP', -1);
/**
* Meta course enrolment plugin.
* @author Petr Skoda
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class enrol_meta_plugin extends enrol_plugin {
/**
* Returns localised name of enrol instance
*
* @param stdClass $instance (null is accepted too)
* @return string
*/
public function get_instance_name($instance) {
global $DB;
if (empty($instance)) {
$enrol = $this->get_name();
return get_string('pluginname', 'enrol_'.$enrol);
} else if (empty($instance->name)) {
$enrol = $this->get_name();
$course = $DB->get_record('course', array('id'=>$instance->customint1));
if ($course) {
$coursename = format_string(get_course_display_name_for_list($course));
} else {
// Use course id, if course is deleted.
$coursename = $instance->customint1;
}
return get_string('pluginname', 'enrol_' . $enrol) . ' (' . $coursename . ')';
} else {
return format_string($instance->name);
}
}
/**
* Returns true if we can add a new instance to this course.
*
* @param int $courseid
* @return boolean
*/
public function can_add_instance($courseid) {
$context = context_course::instance($courseid, MUST_EXIST);
if (!has_capability('moodle/course:enrolconfig', $context) or !has_capability('enrol/meta:config', $context)) {
return false;
}
// Multiple instances supported - multiple parent courses linked.
return true;
}
/**
* Does this plugin allow manual unenrolment of a specific user?
* Yes, but only if user suspended...
*
* @param stdClass $instance course enrol instance
* @param stdClass $ue record from user_enrolments table
*
* @return bool - true means user with 'enrol/xxx:unenrol' may unenrol this user, false means nobody may touch this user enrolment
*/
public function allow_unenrol_user(stdClass $instance, stdClass $ue) {
if ($ue->status == ENROL_USER_SUSPENDED) {
return true;
}
return false;
}
/**
* Called after updating/inserting course.
*
* @param bool $inserted true if course just inserted
* @param stdClass $course
* @param stdClass $data form data
* @return void
*/
public function course_updated($inserted, $course, $data) {
// Meta sync updates are slow, if enrolments get out of sync teacher will have to wait till next cron.
// We should probably add some sync button to the course enrol methods overview page.
}
/**
* Add new instance of enrol plugin.
* @param object $course
* @param array $fields instance fields
* @return int id of last instance, null if can not be created
*/
public function add_instance($course, array $fields = null) {
global $CFG;
require_once("$CFG->dirroot/enrol/meta/locallib.php");
// Support creating multiple at once.
if (isset($fields['customint1']) && is_array($fields['customint1'])) {
$courses = array_unique($fields['customint1']);
} else if (isset($fields['customint1'])) {
$courses = array($fields['customint1']);
} else {
$courses = array(null); // Strange? Yes, but that's how it's working or instance is not created ever.
}
foreach ($courses as $courseid) {
if (!empty($fields['customint2']) && $fields['customint2'] == ENROL_META_CREATE_GROUP) {
$context = context_course::instance($course->id);
require_capability('moodle/course:managegroups', $context);
$groupid = enrol_meta_create_new_group($course->id, $courseid);
$fields['customint2'] = $groupid;
}
$fields['customint1'] = $courseid;
$result = parent::add_instance($course, $fields);
}
enrol_meta_sync($course->id);
return $result;
}
/**
* Update instance of enrol plugin.
* @param stdClass $instance
* @param stdClass $data modified instance fields
* @return boolean
*/
public function update_instance($instance, $data) {
global $CFG;
require_once("$CFG->dirroot/enrol/meta/locallib.php");
if (!empty($data->customint2) && $data->customint2 == ENROL_META_CREATE_GROUP) {
$context = context_course::instance($instance->courseid);
require_capability('moodle/course:managegroups', $context);
$groupid = enrol_meta_create_new_group($instance->courseid, $data->customint1);
$data->customint2 = $groupid;
}
$result = parent::update_instance($instance, $data);
enrol_meta_sync($instance->courseid);
return $result;
}
/**
* Update instance status
*
* @param stdClass $instance
* @param int $newstatus ENROL_INSTANCE_ENABLED, ENROL_INSTANCE_DISABLED
* @return void
*/
public function update_status($instance, $newstatus) {
global $CFG;
parent::update_status($instance, $newstatus);
require_once("$CFG->dirroot/enrol/meta/locallib.php");
enrol_meta_sync($instance->courseid);
}
/**
* Is it possible to delete enrol instance via standard UI?
*
* @param stdClass $instance
* @return bool
*/
public function can_delete_instance($instance) {
$context = context_course::instance($instance->courseid);
return has_capability('enrol/meta:config', $context);
}
/**
* Is it possible to hide/show enrol instance via standard UI?
*
* @param stdClass $instance
* @return bool
*/
public function can_hide_show_instance($instance) {
$context = context_course::instance($instance->courseid);
return has_capability('enrol/meta:config', $context);
}
/**
* We are a good plugin and don't invent our own UI/validation code path.
*
* @return boolean
*/
public function use_standard_editing_ui() {
return true;
}
/**
* Return an array of valid options for the courses.
*
* @param stdClass $instance
* @param context $coursecontext
* @return array
*/
protected function get_course_options($instance, $coursecontext) {
global $DB;
if ($instance->id) {
$where = 'WHERE c.id = :courseid';
$params = array('courseid' => $instance->customint1);
$existing = array();
} else {
$where = '';
$params = array();
$instanceparams = array('enrol' => 'meta', 'courseid' => $instance->courseid);
$existing = $DB->get_records('enrol', $instanceparams, '', 'customint1, id');
}
// TODO: this has to be done via ajax or else it will fail very badly on large sites!
$courses = array();
$select = ', ' . context_helper::get_preload_record_columns_sql('ctx');
$join = "LEFT JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :contextlevel)";
$sortorder = 'c.' . $this->get_config('coursesort', 'sortorder') . ' ASC';
$sql = "SELECT c.id, c.fullname, c.shortname, c.visible $select FROM {course} c $join $where ORDER BY $sortorder";
$rs = $DB->get_recordset_sql($sql, array('contextlevel' => CONTEXT_COURSE) + $params);
foreach ($rs as $c) {
if ($c->id == SITEID or $c->id == $instance->courseid or isset($existing[$c->id])) {
continue;
}
context_helper::preload_from_record($c);
$coursecontext = context_course::instance($c->id);
if (!$c->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
continue;
}
if (!has_capability('enrol/meta:selectaslinked', $coursecontext)) {
continue;
}
$courses[$c->id] = $coursecontext->get_context_name(false);
}
$rs->close();
return $courses;
}
/**
* Return an array of valid options for the groups.
*
* @param context $coursecontext
* @return array
*/
protected function get_group_options($coursecontext) {
$groups = array(0 => get_string('none'));
$courseid = $coursecontext->instanceid;
if (has_capability('moodle/course:managegroups', $coursecontext)) {
$groups[ENROL_META_CREATE_GROUP] = get_string('creategroup', 'enrol_meta');
}
foreach (groups_get_all_groups($courseid) as $group) {
$groups[$group->id] = format_string($group->name, true, array('context' => $coursecontext));
}
return $groups;
}
/**
* Add elements to the edit instance form.
*
* @param stdClass $instance
* @param MoodleQuickForm $mform
* @param context $coursecontext
* @return bool
*/
public function edit_instance_form($instance, MoodleQuickForm $mform, $coursecontext) {
global $DB;
$groups = $this->get_group_options($coursecontext);
$existing = $DB->get_records('enrol', array('enrol' => 'meta', 'courseid' => $coursecontext->instanceid), '', 'customint1, id');
$excludelist = array($coursecontext->instanceid);
foreach ($existing as $existinginstance) {
$excludelist[] = $existinginstance->customint1;
}
$options = array(
'requiredcapabilities' => array('enrol/meta:selectaslinked'),
'multiple' => empty($instance->id), // We only accept multiple values on creation.
'exclude' => $excludelist
);
$mform->addElement('course', 'customint1', get_string('linkedcourse', 'enrol_meta'), $options);
$mform->addRule('customint1', get_string('required'), 'required', null, 'client');
if (!empty($instance->id)) {
$mform->freeze('customint1');
}
$mform->addElement('select', 'customint2', get_string('addgroup', 'enrol_meta'), $groups);
}
/**
* Perform custom validation of the data used to edit the instance.
*
* @param array $data array of ("fieldname"=>value) of submitted data
* @param array $files array of uploaded files "element_name"=>tmp_file_path
* @param object $instance The instance loaded from the DB
* @param context $context The context of the instance we are editing
* @return array of "element_name"=>"error_description" if there are errors,
* or an empty array if everything is OK.
* @return void
*/
public function edit_instance_validation($data, $files, $instance, $context) {
global $DB;
$errors = array();
$thiscourseid = $context->instanceid;
if (!empty($data['customint1'])) {
$coursesidarr = is_array($data['customint1']) ? $data['customint1'] : [$data['customint1']];
list($coursesinsql, $coursesinparams) = $DB->get_in_or_equal($coursesidarr, SQL_PARAMS_NAMED, 'metacourseid');
if ($coursesrecords = $DB->get_records_select('course', "id {$coursesinsql}",
$coursesinparams, '', 'id,visible')) {
// Cast NULL to 0 to avoid possible mess with the SQL.
$instanceid = $instance->id ?? 0;
$existssql = "enrol = :meta AND courseid = :currentcourseid AND id != :id AND customint1 {$coursesinsql}";
$existsparams = [
'meta' => 'meta',
'currentcourseid' => $thiscourseid,
'id' => $instanceid
];
$existsparams += $coursesinparams;
if ($DB->record_exists_select('enrol', $existssql, $existsparams)) {
// We may leave right here as further checks do not make sense in case we have existing enrol records
// with the parameters from above.
$errors['customint1'] = get_string('invalidcourseid', 'error');
} else {
foreach ($coursesrecords as $coursesrecord) {
$coursecontext = context_course::instance($coursesrecord->id);
if (!$coursesrecord->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
$errors['customint1'] = get_string('nopermissions', 'error',
'moodle/course:viewhiddencourses');
} else if (!has_capability('enrol/meta:selectaslinked', $coursecontext)) {
$errors['customint1'] = get_string('nopermissions', 'error',
'enrol/meta:selectaslinked');
} else if ($coursesrecord->id == SITEID or $coursesrecord->id == $thiscourseid) {
$errors['customint1'] = get_string('invalidcourseid', 'error');
}
}
}
} else {
$errors['customint1'] = get_string('invalidcourseid', 'error');
}
} else {
$errors['customint1'] = get_string('required');
}
$validgroups = array_keys($this->get_group_options($context));
$tovalidate = array(
'customint2' => $validgroups
);
$typeerrors = $this->validate_param_types($data, $tovalidate);
$errors = array_merge($errors, $typeerrors);
return $errors;
}
/**
* Restore instance and map settings.
*
* @param restore_enrolments_structure_step $step
* @param stdClass $data
* @param stdClass $course
* @param int $oldid
*/
public function restore_instance(restore_enrolments_structure_step $step, stdClass $data, $course, $oldid) {
global $DB, $CFG;
if (!$step->get_task()->is_samesite()) {
// No meta restore from other sites.
$step->set_mapping('enrol', $oldid, 0);
return;
}
if (!empty($data->customint2)) {
$data->customint2 = $step->get_mappingid('group', $data->customint2);
}
if ($DB->record_exists('course', array('id' => $data->customint1))) {
$instance = $DB->get_record('enrol', array('roleid' => $data->roleid, 'customint1' => $data->customint1,
'courseid' => $course->id, 'enrol' => $this->get_name()));
if ($instance) {
$instanceid = $instance->id;
} else {
$instanceid = $this->add_instance($course, (array)$data);
}
$step->set_mapping('enrol', $oldid, $instanceid);
require_once("$CFG->dirroot/enrol/meta/locallib.php");
enrol_meta_sync($data->customint1);
} else {
$step->set_mapping('enrol', $oldid, 0);
}
}
/**
* Restore user enrolment.
*
* @param restore_enrolments_structure_step $step
* @param stdClass $data
* @param stdClass $instance
* @param int $userid
* @param int $oldinstancestatus
*/
public function restore_user_enrolment(restore_enrolments_structure_step $step, $data, $instance, $userid, $oldinstancestatus) {
global $DB;
if ($this->get_config('unenrolaction') != ENROL_EXT_REMOVED_SUSPENDNOROLES) {
// Enrolments were already synchronised in restore_instance(), we do not want any suspended leftovers.
return;
}
// ENROL_EXT_REMOVED_SUSPENDNOROLES means all previous enrolments are restored
// but without roles and suspended.
if (!$DB->record_exists('user_enrolments', array('enrolid' => $instance->id, 'userid' => $userid))) {
$this->enrol_user($instance, $userid, null, $data->timestart, $data->timeend, ENROL_USER_SUSPENDED);
if ($instance->customint2) {
groups_add_member($instance->customint2, $userid, 'enrol_meta', $instance->id);
}
}
}
/**
* Restore user group membership.
* @param stdClass $instance
* @param int $groupid
* @param int $userid
*/
public function restore_group_member($instance, $groupid, $userid) {
// Nothing to do here, the group members are added in $this->restore_group_restored().
return;
}
}