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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");
require_variable($id); // course id
optional_variable($user); // login as this user
optional_variable($return); // return to the page we came from
if (! $course = get_record("course", "id", $id)) {
error("Course ID was incorrect");
}
if ($course->category) {
require_login($course->id);
}
if (isset($USER->realuser)) { /// Reset user back to their real self
$USER = get_user_info_from_db("id", $USER->realuser);
$USER->loggedin = true;
$USER->site = $CFG->wwwroot;
$USER->sessionIP = md5(getremoteaddr()); // Store the current IP in the session
if (isset($SESSION->oldcurrentgroup)) { // Restore previous "current group" cache.
$SESSION->currentgroup = $SESSION->oldcurrentgroup;
unset($SESSION->oldcurrentgroup);
}
if (isset($SESSION->oldtimeaccess)) { // Restore previous timeaccess settings
$USER->timeaccess = $SESSION->oldtimeaccess;
unset($SESSION->oldtimeaccess);
}
if ($return) { /// That's all we wanted to do, so let's go back
redirect($_SERVER["HTTP_REFERER"]);
exit;
}
}
// $user must be defined to go on
if (!isteacher($course->id)) {
error("Only teachers can use this page!");
}
check_for_restricted_user($USER->username, "$CFG->wwwroot/user/view.php?id=$user&amp;course=$course->id");
if ($course->category and !isstudent($course->id, $user) and !isadmin()) {
error("This student is not in this course!");
}
if (iscreator($user)) {
error("You can not login as this person!");
}
// Remember current timeaccess settings for later
if (isset($USER->timeaccess)) {
$SESSION->oldtimeaccess = $USER->timeaccess;
}
// Login as this student and return to course home page.
$teacher_name = fullname($USER, true);
$teacher_id = "$USER->id";
$USER = get_user_info_from_db("id", $user); // Create the new USER object with all details
$USER->loggedin = true;
$USER->site = $CFG->wwwroot;
$USER->realuser = $teacher_id;
$USER->sessionIP = md5(getremoteaddr()); // Store the current IP in the session
if (isset($SESSION->currentgroup)) { // Remember current cache setting for later
$SESSION->oldcurrentgroup = $SESSION->currentgroup;
unset($SESSION->currentgroup);
}
$student_name = fullname($USER, true);
add_to_log($course->id, "course", "loginas", "../user/view.php?id=$course->id&amp;user=$user", "$teacher_name -> $student_name");
$strloginas = get_string("loginas");
$strloggedinas = get_string("loggedinas", "", $student_name);
print_header("$course->fullname: $strloginas $student_name", "$course->fullname",
"<a href=\"$CFG->wwwroot/course/view.php?id=$course->id\">$course->shortname</a> ->
$strloginas $student_name");
notice($strloggedinas, "$CFG->wwwroot/course/view.php?id=$course->id");
?>
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