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loginas.php
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loginas.php
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<?php // $Id$
// Allows a teacher/admin to login as another user (in stealth mode)
require_once('../config.php');
require_once('lib.php');
/// Reset user back to their real self if needed
$return = optional_param('return', 0, PARAM_BOOL); // return to the page we came from
if (session_is_loggedinas()) {
if (!confirm_sesskey()) {
print_error('confirmsesskeybad');
}
session_unloginas();
if ($return and isset($_SERVER["HTTP_REFERER"])) { // That's all we wanted to do, so let's go back
redirect($_SERVER["HTTP_REFERER"]);
} else {
redirect($CFG->wwwroot);
}
}
///-------------------------------------
/// We are trying to log in as this user in the first place
$id = optional_param('id', SITEID, PARAM_INT); // course id
$userid = required_param('user', PARAM_INT); // login as this user
if (!confirm_sesskey()) {
print_error('confirmsesskeybad');
}
if (!$course = $DB->get_record('course', array('id'=>$id))) {
print_error("invalidcourseid");
}
/// User must be logged in
$systemcontext = get_context_instance(CONTEXT_SYSTEM);
$coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
require_login();
if (has_capability('moodle/user:loginas', $systemcontext)) {
if (has_capability('moodle/site:doanything', $systemcontext, $userid, false)) {
print_error('nologinas');
}
$context = $systemcontext;
} else {
require_login($course);
require_capability('moodle/user:loginas', $coursecontext);
if (!has_capability('moodle/course:view', $coursecontext, $userid, false)) {
print_error('usernotincourse');
}
if (has_capability('moodle/site:doanything', $coursecontext, $userid, false)) {
print_error('nologinas');
}
$context = $coursecontext;
}
/// Login as this user and return to course home page.
$oldfullname = fullname($USER, true);
session_loginas($userid, $context);
$newfullname = fullname($USER, true);
add_to_log($course->id, "course", "loginas", "../user/view.php?id=$course->id&user=$userid", "$oldfullname -> $newfullname");
$strloginas = get_string('loginas');
$strloggedinas = get_string('loggedinas', '', $newfullname);
print_header_simple($strloggedinas, '', build_navigation(array(array('name'=>$strloggedinas, 'link'=>'','type'=>'misc'))),
'', '', true, ' ', navmenu($course));
notice($strloggedinas, "$CFG->wwwroot/course/view.php?id=$course->id");
?>