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Editing: observer.php

<?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/>.

/**
 * Event observer for meta enrolment plugin.
 *
 * @package    enrol_meta
 * @copyright  2013 Rajesh Taneja <rajesh@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

require_once($CFG->dirroot.'/enrol/meta/locallib.php');

/**
 * Event observer for enrol_meta.
 *
 * @package    enrol_meta
 * @copyright  2013 Rajesh Taneja <rajesh@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class enrol_meta_observer extends enrol_meta_handler {

/**
     * Triggered via user_enrolment_created event.
     *
     * @param \core\event\user_enrolment_created $event
     * @return bool true on success.
     */
    public static function user_enrolment_created(\core\event\user_enrolment_created $event) {
        if (!enrol_is_enabled('meta')) {
            // No more enrolments for disabled plugins.
            return true;
        }

if ($event->other['enrol'] === 'meta') {
            // Prevent circular dependencies - we can not sync meta enrolments recursively.
            return true;
        }

self::sync_course_instances($event->courseid, $event->relateduserid);
        return true;
    }

/**
     * Triggered via user_enrolment_deleted event.
     *
     * @param \core\event\user_enrolment_deleted $event
     * @return bool true on success.
     */
    public static function user_enrolment_deleted(\core\event\user_enrolment_deleted $event) {
        if (!enrol_is_enabled('meta')) {
            // This is slow, let enrol_meta_sync() deal with disabled plugin.
            return true;
        }

if ($event->other['enrol'] === 'meta') {
            // Prevent circular dependencies - we can not sync meta enrolments recursively.
            return true;
        }

self::sync_course_instances($event->courseid, $event->relateduserid);

return true;
    }

/**
     * Triggered via user_enrolment_updated event.
     *
     * @param \core\event\user_enrolment_updated $event
     * @return bool true on success
     */
    public static function user_enrolment_updated(\core\event\user_enrolment_updated $event) {
        if (!enrol_is_enabled('meta')) {
            // No modifications if plugin disabled.
            return true;
        }

if ($event->other['enrol'] === 'meta') {
            // Prevent circular dependencies - we can not sync meta enrolments recursively.
            return true;
        }

self::sync_course_instances($event->courseid, $event->relateduserid);

return true;
    }

/**
     * Triggered via role_assigned event.
     *
     * @param \core\event\role_assigned $event
     * @return bool true on success.
     */
    public static function role_assigned(\core\event\role_assigned $event) {
        if (!enrol_is_enabled('meta')) {
            return true;
        }

// Prevent circular dependencies - we can not sync meta roles recursively.
        if ($event->other['component'] === 'enrol_meta') {
            return true;
        }

// Only course level roles are interesting.
        if (!$parentcontext = context::instance_by_id($event->contextid, IGNORE_MISSING)) {
            return true;
        }
        if ($parentcontext->contextlevel != CONTEXT_COURSE) {
            return true;
        }

self::sync_course_instances($parentcontext->instanceid, $event->relateduserid);

return true;
    }

/**
     * Triggered via role_unassigned event.
     *
     * @param \core\event\role_unassigned $event
     * @return bool true on success
     */
    public static function role_unassigned(\core\event\role_unassigned $event) {
        if (!enrol_is_enabled('meta')) {
            // All roles are removed via cron automatically.
            return true;
        }

// Prevent circular dependencies - we can not sync meta roles recursively.
        if ($event->other['component'] === 'enrol_meta') {
            return true;
        }

self::sync_course_instances($parentcontext->instanceid, $event->relateduserid);

return true;
    }

/**
     * Triggered via course_deleted event.
     *
     * @param \core\event\course_deleted $event
     * @return bool true on success
     */
    public static function course_deleted(\core\event\course_deleted $event) {
        global $DB;

if (!enrol_is_enabled('meta')) {
            // This is slow, let enrol_meta_sync() deal with disabled plugin.
            return true;
        }

// Does anything want to sync with this parent?
        if (!$enrols = $DB->get_records('enrol', array('customint1' => $event->objectid, 'enrol' => 'meta'),
                'courseid ASC, id ASC')) {
            return true;
        }

$plugin = enrol_get_plugin('meta');
        $unenrolaction = $plugin->get_config('unenrolaction', ENROL_EXT_REMOVED_SUSPENDNOROLES);

if ($unenrolaction == ENROL_EXT_REMOVED_UNENROL) {
            // Simple, just delete this instance which purges all enrolments,
            // admins were warned that this is risky setting!
            foreach ($enrols as $enrol) {
                $plugin->delete_instance($enrol);
            }
            return true;
        }

foreach ($enrols as $enrol) {
            if ($unenrolaction == ENROL_EXT_REMOVED_SUSPEND or $unenrolaction == ENROL_EXT_REMOVED_SUSPENDNOROLES) {
                // This makes all enrolments suspended very quickly.
                $plugin->update_status($enrol, ENROL_INSTANCE_DISABLED);
            }
            if ($unenrolaction == ENROL_EXT_REMOVED_SUSPENDNOROLES) {
                $context = context_course::instance($enrol->courseid);
                role_unassign_all(array('contextid'=>$context->id, 'component'=>'enrol_meta', 'itemid'=>$enrol->id));
            }
        }

return true;
    }

/**
     * Triggered via enrol_instance_updated event.
     *
     * @param \core\event\enrol_instance_updated $event
     * @return boolean
     */
    public static function enrol_instance_updated(\core\event\enrol_instance_updated $event) {
        global $DB;

if (!enrol_is_enabled('meta')) {
            // This is slow, let enrol_meta_sync() deal with disabled plugin.
            return true;
        }

// Does anything want to sync with this parent?
        $affectedcourses = $DB->get_fieldset_sql('SELECT DISTINCT courseid FROM {enrol} '.
                'WHERE customint1 = ? AND enrol = ?',
                array($event->courseid, 'meta'));

foreach ($affectedcourses as $courseid) {
            enrol_meta_sync($courseid);
        }

return true;
    }
}

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