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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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namespace core\session;
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use core\context;
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use core\context\course as context_course;
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use core\context\system as context_system;
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use core\session\manager as sessionmanager;
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use stdClass;
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/**
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* Helper functions for the 'login as' feature.
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*
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* @package core
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* @author Jason den Dulk <jasondendulk@catalyst-au.net>
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* @copyright 2025 Catalyst IT
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class loginas_helper {
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/**
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* Determine which context a user can login as another user for, given the requested target user and course. If the
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* person cannot login at all, then null will be returned.
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*
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* @param stdClass $currentuser The current user. Defaults to $USER.
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* @param stdClass $loginasuser The user to be logged in as.
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* @param stdClass|null $course The course currently being looked at. Applies to those who can only login within a
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* course context. If null, then only system context will be considered.
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* @return context|null Returns the context that the user is able to login as, or null if no context can be found.
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*/
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public static function get_context_user_can_login_as(
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stdClass $currentuser,
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stdClass $loginasuser,
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?stdClass $course = null
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): ?context {
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$systemcontext = context_system::instance();
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if (
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$loginasuser->deleted || // Can't login as a user that has been removed.
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$currentuser->id == $loginasuser->id || // Pointless for a user to login as himself.
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sessionmanager::is_loggedinas() // Already logged in as someone.
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) {
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return null;
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}
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// Site admins can always login as someone else.
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if (is_siteadmin($currentuser)) {
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return $systemcontext;
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}
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// Non admins can never login as an admin.
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if (is_siteadmin($loginasuser)) {
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return null;
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}
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// Now, we accept anyone who can loginas at the site level, and they can do so at the system level.
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if (has_capability('moodle/user:loginas', $systemcontext, $currentuser)) {
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return $systemcontext;
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}
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if (!empty($course)) {
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$coursecontext = context_course::instance($course->id);
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if (
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// Reject all that do not have loginas capability.
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!has_capability('moodle/user:loginas', $coursecontext, $currentuser) ||
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// Reject if user is trying to login as someone with site level loginas powers.
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has_capability('moodle/user:loginas', $systemcontext, $loginasuser) ||
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// Reject if other is not enrolled.
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!is_enrolled($coursecontext, $loginasuser->id)
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) {
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return null;
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}
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// Check if the users are in the same group.
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if (groups_get_course_groupmode($course) == SEPARATEGROUPS &&
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!has_capability('moodle/site:accessallgroups', $coursecontext, $currentuser)) {
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$samegroup = false;
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if ($groups = groups_get_all_groups($course->id, $currentuser->id)) {
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foreach ($groups as $group) {
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if (groups_is_member($group->id, $loginasuser->id)) {
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$samegroup = true;
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break;
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}
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}
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}
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if (!$samegroup) {
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return null;
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}
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}
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// Passed all checks.
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return $coursecontext;
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}
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return null;
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}
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}
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