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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/>.
/**
* Implements the XML-RPC methods this plugin publishes to MNet peers
*
* This file must be named enrol.php because current MNet framework has the
* filename hardcoded in XML-RPC path and we want to be compatible with
* Moodle 1.x MNet clients. There is a proposal in MDL-21993 to allow
* map XMP-RPC calls to whatever file, function, class or methods. Once this
* is fixed, this file will be probably renamed to mnetlib.php (which could
* be a common name of a plugin library containing functions/methods callable
* via MNet framework.
*
* @package enrol_mnet
* @copyright 2010 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* MNet server-side methods that are part of mnetservice_enrol
*
* The weird name of the class tries to follow a pattern
* {plugintype}_{pluginnname}_mnetservice_{servicename}
*
* Class methods are compatible with API 1 of the service used by Moodle 1.x
* and 2.0 peers. The API version might become a part of class name but it is
* not neccessary due to how xml-rcp methods are/will be mapped to php methods.
*/
class enrol_mnet_mnetservice_enrol {
/**
* Returns list of courses that we offer to the caller for remote enrolment of their users
*
* Since Moodle 2.0, courses are made available for MNet peers by creating an instance
* of enrol_mnet plugin for the course. Hidden courses are not returned. If there are two
* instances - one specific for the host and one for 'All hosts', the setting of the specific
* one is used. The id of the peer is kept in customint1, no other custom fields are used.
*
* @uses mnet_remote_client Callable via XML-RPC only
* @return array
*/
public function available_courses() {
global $CFG, $DB;
require_once($CFG->libdir.'/filelib.php');
if (!$client = get_mnet_remote_client()) {
die('Callable via XML-RPC only');
}
// we call our id as 'remoteid' because it will be sent to the peer
// the column aliases are required by MNet protocol API for clients 1.x and 2.0
$sql = "SELECT c.id AS remoteid, c.fullname, c.shortname, c.idnumber, c.summary, c.summaryformat,
c.sortorder, c.startdate, cat.id AS cat_id, cat.name AS cat_name,
cat.description AS cat_description, cat.descriptionformat AS cat_descriptionformat,
e.cost, e.currency, e.roleid AS defaultroleid, r.name AS defaultrolename,
e.customint1
FROM {enrol} e
INNER JOIN {course} c ON c.id = e.courseid
INNER JOIN {course_categories} cat ON cat.id = c.category
INNER JOIN {role} r ON r.id = e.roleid
WHERE e.enrol = 'mnet'
AND (e.customint1 = 0 OR e.customint1 = ?)
AND c.visible = 1
ORDER BY cat.sortorder, c.sortorder, c.shortname";
$rs = $DB->get_recordset_sql($sql, array($client->id));
$courses = array();
foreach ($rs as $course) {
// use the record if it does not exist yet or is host-specific
if (empty($courses[$course->remoteid]) or ($course->customint1 > 0)) {
unset($course->customint1); // the client does not need to know this
$context = context_course::instance($course->remoteid);
// Rewrite file URLs so that they are correct
$course->summary = file_rewrite_pluginfile_urls($course->summary, 'pluginfile.php', $context->id, 'course', 'summary', false);
$courses[$course->remoteid] = $course;
}
}
$rs->close();
return array_values($courses); // can not use keys for backward compatibility
}
/**
* This method has never been implemented in Moodle MNet API
*
* @uses mnet_remote_client Callable via XML-RPC only
* @return array empty array
*/
public function user_enrolments() {
global $CFG, $DB;
if (!$client = get_mnet_remote_client()) {
die('Callable via XML-RPC only');
}
return array();
}
/**
* Enrol remote user to our course
*
* If we do not have local record for the remote user in our database,
* it gets created here.
*
* @uses mnet_remote_client Callable via XML-RPC only
* @param array $userdata user details {@see mnet_fields_to_import()}
* @param int $courseid our local course id
* @return bool true if the enrolment has been successful, throws exception otherwise
*/
public function enrol_user(array $userdata, $courseid) {
global $CFG, $DB;
require_once(__DIR__.'/lib.php');
if (!$client = get_mnet_remote_client()) {
die('Callable via XML-RPC only');
}
if (empty($userdata['username'])) {
throw new mnet_server_exception(5021, 'emptyusername', 'enrol_mnet');
}
// do we know the remote user?
$user = $DB->get_record('user', array('username'=>$userdata['username'], 'mnethostid'=>$client->id));
if ($user === false) {
// here we could check the setting if the enrol_mnet is allowed to auto-register
// users {@link http://tracker.moodle.org/browse/MDL-21327}
$user = mnet_strip_user((object)$userdata, mnet_fields_to_import($client));
$user->mnethostid = $client->id;
$user->auth = 'mnet';
$user->confirmed = 1;
try {
$user->id = $DB->insert_record('user', $user);
} catch (Exception $e) {
throw new mnet_server_exception(5011, 'couldnotcreateuser', 'enrol_mnet');
}
}
if (! $course = $DB->get_record('course', array('id'=>$courseid))) {
throw new mnet_server_exception(5012, 'coursenotfound', 'enrol_mnet');
}
$courses = $this->available_courses();
$isavailable = false;
foreach ($courses as $available) {
if ($available->remoteid == $course->id) {
$isavailable = true;
break;
}
}
if (!$isavailable) {
throw new mnet_server_exception(5013, 'courseunavailable', 'enrol_mnet');
}
// try to load host specific enrol_mnet instance first
$instance = $DB->get_record('enrol', array('courseid'=>$course->id, 'enrol'=>'mnet', 'customint1'=>$client->id), '*', IGNORE_MISSING);
if ($instance === false) {
// if not found, try to load instance for all hosts
$instance = $DB->get_record('enrol', array('courseid'=>$course->id, 'enrol'=>'mnet', 'customint1'=>0), '*', IGNORE_MISSING);
}
if ($instance === false) {
// this should not happen as the course was returned by {@see self::available_courses()}
throw new mnet_server_exception(5017, 'noenrolinstance', 'enrol_mnet');
}
if (!$enrol = enrol_get_plugin('mnet')) {
throw new mnet_server_exception(5018, 'couldnotinstantiate', 'enrol_mnet');
}
try {
$enrol->enrol_user($instance, $user->id, $instance->roleid, time());
} catch (Exception $e) {
throw new mnet_server_exception(5019, 'couldnotenrol', 'enrol_mnet', $e->getMessage());
}
return true;
}
/**
* Unenrol remote user from our course
*
* Only users enrolled via enrol_mnet plugin can be unenrolled remotely. If the
* remote user is enrolled into the local course via some other enrol plugin
* (enrol_manual for example), the remote host can't touch such enrolment. Please
* do not report this behaviour as bug, it is a feature ;-)
*
* @uses mnet_remote_client Callable via XML-RPC only
* @param string $username of the remote user
* @param int $courseid of our local course
* @return bool true if the unenrolment has been successful, throws exception otherwise
*/
public function unenrol_user($username, $courseid) {
global $CFG, $DB;
if (!$client = get_mnet_remote_client()) {
die('Callable via XML-RPC only');
}
$user = $DB->get_record('user', array('username'=>$username, 'mnethostid'=>$client->id));
if ($user === false) {
throw new mnet_server_exception(5014, 'usernotfound', 'enrol_mnet');
}
if (! $course = $DB->get_record('course', array('id'=>$courseid))) {
throw new mnet_server_exception(5012, 'coursenotfound', 'enrol_mnet');
}
$courses = $this->available_courses();
$isavailable = false;
foreach ($courses as $available) {
if ($available->remoteid == $course->id) {
$isavailable = true;
break;
}
}
if (!$isavailable) {
// if they can not enrol, they can not unenrol
throw new mnet_server_exception(5013, 'courseunavailable', 'enrol_mnet');
}
// try to load host specific enrol_mnet instance first
$instance = $DB->get_record('enrol', array('courseid'=>$course->id, 'enrol'=>'mnet', 'customint1'=>$client->id), '*', IGNORE_MISSING);
if ($instance === false) {
// if not found, try to load instance for all hosts
$instance = $DB->get_record('enrol', array('courseid'=>$course->id, 'enrol'=>'mnet', 'customint1'=>0), '*', IGNORE_MISSING);
$instanceforall = true;
}
if ($instance === false) {
// this should not happen as the course was returned by {@see self::available_courses()}
throw new mnet_server_exception(5017, 'noenrolinstance', 'enrol_mnet');
}
if (!$enrol = enrol_get_plugin('mnet')) {
throw new mnet_server_exception(5018, 'couldnotinstantiate', 'enrol_mnet');
}
if ($DB->record_exists('user_enrolments', array('enrolid'=>$instance->id, 'userid'=>$user->id))) {
try {
$enrol->unenrol_user($instance, $user->id);
} catch (Exception $e) {
throw new mnet_server_exception(5020, 'couldnotunenrol', 'enrol_mnet', $e->getMessage());
}
}
if (empty($instanceforall)) {
// if the user was enrolled via 'All hosts' instance and the specific one
// was created after that, the first enrolment would be kept.
$instance = $DB->get_record('enrol', array('courseid'=>$course->id, 'enrol'=>'mnet', 'customint1'=>0), '*', IGNORE_MISSING);
if ($instance) {
// repeat the same procedure for 'All hosts' instance, too. Note that as the host specific
// instance exists, it will be used for the future enrolments
if ($DB->record_exists('user_enrolments', array('enrolid'=>$instance->id, 'userid'=>$user->id))) {
try {
$enrol->unenrol_user($instance, $user->id);
} catch (Exception $e) {
throw new mnet_server_exception(5020, 'couldnotunenrol', 'enrol_mnet', $e->getMessage());
}
}
}
}
return true;
}
/**
* Returns a list of users from the client server who are enrolled in our course
*
* Suitable instance of enrol_mnet must be created in the course. This method will not
* return any information about the enrolments in courses that are not available for
* remote enrolment, even if their users are enrolled into them via other plugin
* (note the difference from {@link self::user_enrolments()}).
*
* This method will return enrolment information for users from hosts regardless
* the enrolment plugin. It does not matter if the user was enrolled remotely by
* their admin or locally. Once the course is available for remote enrolments, we
* will tell them everything about their users.
*
* In Moodle 1.x the returned array used to be indexed by username. The side effect
* of MDL-19219 fix is that we do not need to use such index and therefore we can
* return all enrolment records. MNet clients 1.x will only use the last record for
* the student, if she is enrolled via multiple plugins.
*
* @uses mnet_remote_client Callable via XML-RPC only
* @param int $courseid ID of our course
* @param string|array $roles comma separated list of role shortnames (or array of them)
* @return array
*/
public function course_enrolments($courseid, $roles=null) {
global $DB, $CFG;
if (!$client = get_mnet_remote_client()) {
die('Callable via XML-RPC only');
}
$sql = "SELECT u.username, r.shortname, r.name, e.enrol, ue.timemodified
FROM {user_enrolments} ue
JOIN {user} u ON ue.userid = u.id
JOIN {enrol} e ON ue.enrolid = e.id
JOIN {role} r ON e.roleid = r.id
WHERE u.mnethostid = :mnethostid
AND e.courseid = :courseid
AND u.id <> :guestid
AND u.confirmed = 1
AND u.deleted = 0";
$params['mnethostid'] = $client->id;
$params['courseid'] = $courseid;
$params['guestid'] = $CFG->siteguest;
if (!is_null($roles)) {
if (!is_array($roles)) {
$roles = explode(',', $roles);
}
$roles = array_map('trim', $roles);
list($rsql, $rparams) = $DB->get_in_or_equal($roles, SQL_PARAMS_NAMED);
$sql .= " AND r.shortname $rsql";
$params = array_merge($params, $rparams);
}
list($sort, $sortparams) = users_order_by_sql('u');
$sql .= " ORDER BY $sort";
$rs = $DB->get_recordset_sql($sql, array_merge($params, $sortparams));
$list = array();
foreach ($rs as $record) {
$list[] = $record;
}
$rs->close();
return $list;
}
}