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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/>.
/**
* Local stuff for category enrolment plugin.
*
* @package enrol_category
* @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();
/**
* Event handler for category enrolment plugin.
*
* We try to keep everything in sync via listening to events,
* it may fail sometimes, so we always do a full sync in cron too.
*/
class enrol_category_observer {
/**
* Triggered when user is assigned a new role.
*
* @param \core\event\role_assigned $event
*/
public static function role_assigned(\core\event\role_assigned $event) {
global $DB;
if (!enrol_is_enabled('category')) {
return;
}
$ra = new stdClass();
$ra->roleid = $event->objectid;
$ra->userid = $event->relateduserid;
$ra->contextid = $event->contextid;
//only category level roles are interesting
$parentcontext = context::instance_by_id($ra->contextid);
if ($parentcontext->contextlevel != CONTEXT_COURSECAT) {
return;
}
// Make sure the role is to be actually synchronised,
// please note we are ignoring overrides of the synchronised capability (for performance reasons in full sync).
$syscontext = context_system::instance();
if (!$DB->record_exists('role_capabilities', array('contextid'=>$syscontext->id, 'roleid'=>$ra->roleid, 'capability'=>'enrol/category:synchronised', 'permission'=>CAP_ALLOW))) {
return;
}
// Add necessary enrol instances.
$plugin = enrol_get_plugin('category');
$sql = "SELECT c.*
FROM {course} c
JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :courselevel AND ctx.path LIKE :match)
LEFT JOIN {enrol} e ON (e.courseid = c.id AND e.enrol = 'category')
WHERE e.id IS NULL";
$params = array('courselevel'=>CONTEXT_COURSE, 'match'=>$parentcontext->path.'/%');
$rs = $DB->get_recordset_sql($sql, $params);
foreach ($rs as $course) {
$plugin->add_instance($course);
}
$rs->close();
// Now look for missing enrolments.
$sql = "SELECT e.*
FROM {course} c
JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :courselevel AND ctx.path LIKE :match)
JOIN {enrol} e ON (e.courseid = c.id AND e.enrol = 'category')
LEFT JOIN {user_enrolments} ue ON (ue.enrolid = e.id AND ue.userid = :userid)
WHERE ue.id IS NULL";
$params = array('courselevel'=>CONTEXT_COURSE, 'match'=>$parentcontext->path.'/%', 'userid'=>$ra->userid);
$rs = $DB->get_recordset_sql($sql, $params);
foreach ($rs as $instance) {
$plugin->enrol_user($instance, $ra->userid, null, time());
}
$rs->close();
}
/**
* Triggered when user role is unassigned.
*
* @param \core\event\role_unassigned $event
*/
public static function role_unassigned(\core\event\role_unassigned $event) {
global $DB;
if (!enrol_is_enabled('category')) {
return;
}
$ra = new stdClass();
$ra->userid = $event->relateduserid;
$ra->contextid = $event->contextid;
// only category level roles are interesting
$parentcontext = context::instance_by_id($ra->contextid);
if ($parentcontext->contextlevel != CONTEXT_COURSECAT) {
return;
}
// Now this is going to be a bit slow, take all enrolments in child courses and verify each separately.
$syscontext = context_system::instance();
if (!$roles = get_roles_with_capability('enrol/category:synchronised', CAP_ALLOW, $syscontext)) {
return;
}
$plugin = enrol_get_plugin('category');
$sql = "SELECT e.*
FROM {course} c
JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :courselevel AND ctx.path LIKE :match)
JOIN {enrol} e ON (e.courseid = c.id AND e.enrol = 'category')
JOIN {user_enrolments} ue ON (ue.enrolid = e.id AND ue.userid = :userid)";
$params = array('courselevel'=>CONTEXT_COURSE, 'match'=>$parentcontext->path.'/%', 'userid'=>$ra->userid);
$rs = $DB->get_recordset_sql($sql, $params);
list($roleids, $params) = $DB->get_in_or_equal(array_keys($roles), SQL_PARAMS_NAMED, 'r');
$params['userid'] = $ra->userid;
foreach ($rs as $instance) {
$coursecontext = context_course::instance($instance->courseid);
$contextids = $coursecontext->get_parent_context_ids();
array_pop($contextids); // Remove system context, we are interested in categories only.
list($contextids, $contextparams) = $DB->get_in_or_equal($contextids, SQL_PARAMS_NAMED, 'c');
$params = array_merge($params, $contextparams);
$sql = "SELECT ra.id
FROM {role_assignments} ra
WHERE ra.userid = :userid AND ra.contextid $contextids AND ra.roleid $roleids";
if (!$DB->record_exists_sql($sql, $params)) {
// User does not have any interesting role in any parent context, let's unenrol.
$plugin->unenrol_user($instance, $ra->userid);
}
}
$rs->close();
}
}