function lockdownbrowser_check_for_lock()
{
global $CFG, $DB;
$id = optional_param('id', 0, PARAM_INT);
// Course Module ID
$q = optional_param('q', 0, PARAM_INT);
// or quiz ID
$attempt = optional_param('attempt', 0, PARAM_INT);
// A particular attempt ID for review
$script = substr(strrchr($_SERVER['SCRIPT_NAME'], "/"), 1);
if ($attempt) {
$discriminator = $attempt;
} else {
if ($q) {
$discriminator = $q;
} else {
if ($id) {
$discriminator = $id;
}
}
}
if ("attempt.php" == $script && ($script . "NONE" . $discriminator == $_SESSION['LOCKDOWNBROWSER_CONTEXT'] || $script . "VALID" . $discriminator == $_SESSION['LOCKDOWNBROWSER_CONTEXT'])) {
return 1;
} else {
if ("review.php" == $script && ($script . "NONE" . $discriminator == $_SESSION['LOCKDOWNBROWSER_CONTEXT'] || $script . "VALID" . $discriminator == $_SESSION['LOCKDOWNBROWSER_CONTEXT'])) {
return 1;
}
}
// debug
//echo " DOING LDB CHECK";
if ($id) {
if (!($cm = get_coursemodule_from_id('quiz', $id))) {
error("There is no coursemodule with id {$id}");
}
if (!($course = $DB->get_record("course", array("id" => $cm->course)))) {
error("Course is misconfigured");
}
if (!($quiz = $DB->get_record("quiz", array("id" => $cm->instance)))) {
error("The quiz with id {$cm->instance} corresponding to this coursemodule {$id} is missing");
}
} else {
if ($q) {
if (!($quiz = $DB->get_record("quiz", array("id" => $q)))) {
error("There is no quiz with id {$q}");
}
if (!($course = $DB->get_record("course", array("id" => $quiz->course)))) {
error("The course with id {$quiz->course} that the quiz with id {$q} belongs to is missing");
}
if (!($cm = get_coursemodule_from_instance("quiz", $quiz->id, $course->id))) {
error("The course module for the quiz with id {$q} is missing");
}
} else {
if ($attempt) {
if (!($attempt = $DB->get_record("quiz_attempts", array("id" => $attempt)))) {
error("No such attempt ID exists");
}
if (!($quiz = $DB->get_record("quiz", array("id" => $attempt->quiz)))) {
error("The quiz with id {$attempt->quiz} belonging to attempt {$attempt} is missing");
}
if (!($course = $DB->get_record("course", array("id" => $quiz->course)))) {
error("The course with id {$quiz->course} that the quiz with id {$quiz->id} belongs to is missing");
}
if (!($cm = get_coursemodule_from_instance("quiz", $quiz->id, $course->id))) {
error("The course module for the quiz with id {$quiz->id} is missing");
}
} else {
echo "<div style='font-size: 150%; color: red'>Cannot get quiz from: " . me() . "</div>";
die;
}
}
}
$ldbopt = lockdownbrowser_get_quiz_options($quiz->id);
if (!$ldbopt) {
$_SESSION['LOCKDOWNBROWSER_CONTEXT'] = $script . "NONE" . $discriminator;
} else {
$context = context_module::instance($cm->id);
if (has_capability('mod/quiz:manage', $context) && has_capability('mod/quiz:view', $context) && has_capability('mod/quiz:attempt', $context)) {
$_SESSION['LOCKDOWNBROWSER_CONTEXT'] = $script . "NONE" . $discriminator;
} else {
$ok = true;
$myerror = "Unknown";
if (!isset($_COOKIE[$CFG->block_lockdownbrowser_LDB_SESSION_COOKIE . $CFG->sessioncookie])) {
$myerror = "<div style='font-size: 150%; color:red; text-align: center; padding: 30px'>Session</div>";
$ok = false;
} else {
$sesskey = $_COOKIE[$CFG->block_lockdownbrowser_LDB_SESSION_COOKIE . $CFG->sessioncookie];
}
if ($ok) {
$ldb_detected = lockdownbrowser_browser_detected();
if (!$ldb_detected) {
$myerror = "<div style='font-size: 150%; color:red; text-align: center; padding: 30px'>" . get_string('ldb_required', 'block_lockdownbrowser') . "</div>";
//if (strlen($CFG->block_lockdownbrowser_LDB_DOWNLOAD) > 0) {
// $myerror .= "<div style='font-size: 125%; color:black; text-align: center;'>".
// get_string('click','block_lockdownbrowser')." <a href='".$CFG->block_lockdownbrowser_LDB_DOWNLOAD."' target='_blank'>".get_string('here','block_lockdownbrowser')."</a>".get_string('todownload','block_lockdownbrowser')."</div>";
//}
if (!empty($CFG->block_lockdownbrowser_LDB_DOWNLOAD)) {
$myerror .= "<div style='font-size: 125%; color:black; text-align: center;'>" . get_string('click', 'block_lockdownbrowser') . " <a href='" . $CFG->block_lockdownbrowser_LDB_DOWNLOAD . "' target='_blank'>" . get_string('here', 'block_lockdownbrowser') . "</a>" . get_string('todownload', 'block_lockdownbrowser') . "</div>";
} else {
$myerror .= "<div style='font-size: 125%; color:black; text-align: center;'>" . get_string('ldb_download_disabled', 'block_lockdownbrowser') . "</div>";
}
$ok = false;
}
}
if ($ok) {
$ldbs = optional_param('ldbs', 0, PARAM_TEXT);
if (!$ldbs) {
$use_existing = false;
$existing = $DB->get_record('block_lockdownbrowser_sess', array('sesskey' => $sesskey));
if ($existing && strcmp($existing->sesskey, $sesskey) == 0) {
$existobj1 = $DB->get_record('block_lockdownbrowser_toke', array('id' => $existing->id));
if ($existobj1 && strcmp($existobj1->sesskey, $sesskey) == 0) {
$obj1 = $existobj1;
$use_existing = true;
}
}
if (!$use_existing) {
$errmsg = lockdownbrowser_allocate_token1($sesskey, me() . "&ldbs=" . $sesskey);
if (is_string($errmsg)) {
$myerror = "Database error: " . $errmsg;
$ok = false;
}
}
} else {
if ($ldbs != $sesskey || !lockdownbrowser_validate_token2()) {
$myerror = "<div style='font-size: 150%; color:red; text-align: center; padding: 30px'>Session</div>";
$ok = false;
}
}
}
if ($ok) {
$_SESSION['LOCKDOWNBROWSER_CONTEXT'] = $script . "VALID" . $discriminator;
} else {
$_SESSION['LOCKDOWNBROWSER_CONTEXT'] = $script . "INVALID" . $discriminator;
echo $myerror;
die;
}
}
}
}
function lockdownbrowser_MonitorActionExamSync($parameters)
{
global $DB;
if (!isloggedin()) {
lockdownbrowser_MonitorServiceError(2004, "Must be logged in to perform the requested action");
}
if (!is_siteadmin()) {
lockdownbrowser_MonitorServiceError(2024, "Must be logged in as admin to perform the requested action");
}
if (!isset($parameters["courseRefId"]) || strlen($parameters["courseRefId"]) == 0) {
lockdownbrowser_MonitorServiceError(2025, "No courseRefId parameter was specified");
}
$course_id = intval($parameters["courseRefId"]);
$coursemodules = get_coursemodules_in_course("quiz", $course_id);
if ($coursemodules === FALSE) {
$coursemodules = array();
}
$body = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n";
if (empty($coursemodules)) {
$body .= "<assessmentList />\r\n";
lockdownbrowser_MonitorServiceResponse("text/xml", $body, TRUE);
}
$body .= "<assessmentList>\r\n";
foreach ($coursemodules as $cm) {
$modrec = $DB->get_record("modules", array("id" => $cm->module));
if ($modrec === FALSE) {
continue;
}
$quiz = $DB->get_record($modrec->name, array("id" => $cm->instance));
if ($quiz === FALSE) {
continue;
}
$body .= "\t<assessment>\r\n";
$body .= "\t\t<id>";
$body .= utf8_encode(htmlspecialchars(trim($cm->id)));
$body .= "</id>\r\n";
$body .= "\t\t<title>";
$body .= utf8_encode(htmlspecialchars(trim($cm->name)));
$body .= "</title>\r\n";
$settings = lockdownbrowser_get_quiz_options($cm->instance);
if ($settings !== FALSE) {
$body .= "\t\t<ldbEnabled>true</ldbEnabled>\r\n";
} else {
$body .= "\t\t<ldbEnabled>false</ldbEnabled>\r\n";
}
if ($settings !== FALSE && isset($settings->password) && !is_null($settings->password) && strlen($settings->password) > 0) {
$body .= "\t\t<exitPassword>";
$body .= utf8_encode(htmlspecialchars($settings->password));
$body .= "</exitPassword>\r\n";
}
if ($settings !== FALSE && isset($settings->monitor) && !is_null($settings->monitor) && strlen($settings->monitor) > 0) {
$body .= "\t\t<monitorEnabled>true</monitorEnabled>\r\n";
$body .= "\t\t<extendedData>";
$body .= utf8_encode(htmlspecialchars($settings->monitor));
$body .= "</extendedData>\r\n";
} else {
$body .= "\t\t<monitorEnabled>false</monitorEnabled>\r\n";
}
// Moodle browser security
// popup (0=none, 1=full screen pop-up with some JavaScript security)
// Moodle 2.2.0+ (quiz module 2011100600+)
// browsersecurity ('-', 'securewindow', 'safebrowser')
// if this setting is not disabled, it will interfere with the LDB integration
if (isset($quiz->browsersecurity)) {
if ($quiz->browsersecurity != "-") {
$launch_in_new_window = TRUE;
} else {
$launch_in_new_window = FALSE;
}
} else {
if ($quiz->popup != 0) {
$launch_in_new_window = TRUE;
} else {
$launch_in_new_window = FALSE;
}
}
if ($launch_in_new_window) {
$body .= "\t\t<launchInNewWindow>true</launchInNewWindow>\r\n";
} else {
$body .= "\t\t<launchInNewWindow>false</launchInNewWindow>\r\n";
}
if ($settings !== FALSE && $launch_in_new_window) {
$body .= "\t\t<ok>false</ok>\r\n";
} else {
$body .= "\t\t<ok>true</ok>\r\n";
}
$body .= "\t</assessment>\r\n";
}
$body .= "</assessmentList>\r\n";
lockdownbrowser_MonitorServiceResponse("text/xml", $body, TRUE);
}