}
require_login($course);
require_capability('moodle/course:enrolreview', $context);
require_sesskey();
echo $OUTPUT->header();
// send headers
$manager = new course_enrolment_manager($PAGE, $course);
$outcome = new stdClass();
$outcome->success = true;
$outcome->response = new stdClass();
$outcome->error = '';
$searchanywhere = get_user_preferences('userselector_searchanywhere', false);
switch ($action) {
case 'unenrol':
$ue = $DB->get_record('user_enrolments', array('id' => required_param('ue', PARAM_INT)), '*', MUST_EXIST);
list($instance, $plugin) = $manager->get_user_enrolment_components($ue);
if (!$instance || !$plugin || !enrol_is_enabled($instance->enrol) || !$plugin->allow_unenrol_user($instance, $ue) || !has_capability("enrol/{$instance->enrol}:unenrol", $manager->get_context()) || !$manager->unenrol_user($ue)) {
throw new enrol_ajax_exception('unenrolnotpermitted');
}
break;
case 'unassign':
$role = required_param('role', PARAM_INT);
$user = required_param('user', PARAM_INT);
if (!has_capability('moodle/role:assign', $manager->get_context()) || !$manager->unassign_role_from_user($user, $role)) {
throw new enrol_ajax_exception('unassignnotpermitted');
}
break;
case 'assign':
$user = $DB->get_record('user', array('id' => required_param('user', PARAM_INT)), '*', MUST_EXIST);
$roleid = required_param('roleid', PARAM_INT);
if (!array_key_exists($roleid, $manager->get_assignable_roles())) {
