Adding expiry time margin to setting and updating settings text.

attendance.php

@@ -33,6 +33,7 @@ $id = required_param('sessid', PARAM_INT);
 $qrpass = optional_param('qrpass', '', PARAM_TEXT);
 
 $attforsession = $DB->get_record('attendance_sessions', array('id' => $id), '*', MUST_EXIST);
+$attconfig = get_config('attendance');
 $attendance = $DB->get_record('attendance', array('id' => $attforsession->attendanceid), '*', MUST_EXIST);
 $cm = get_coursemodule_from_instance('attendance', $attendance->id, 0, false, MUST_EXIST);
 $course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
@@ -54,7 +55,7 @@ if ($attforsession->rotateqrcode == 1) {
         // Check password
         $sql = 'SELECT * FROM {attendance_rotate_passwords}'.
                 ' WHERE attendanceid = ? AND expirytime > ? ORDER BY expirytime ASC LIMIT 2';
-        $qrpassdatabase = $DB->get_records_sql($sql, ['attendanceid' => $id, time() - 2]);
+        $qrpassdatabase = $DB->get_records_sql($sql, ['attendanceid' => $id, time() - $attconfig->rotateqrcodeexpirymargin]);
 
         $qrpassflag = false;
 

lang/en/attendance.php

@@ -245,8 +245,10 @@ $string['includeall'] = 'Select all sessions';
 $string['includenottaken'] = 'Include not taken sessions';
 $string['includeqrcode'] = 'Include QR code';
 $string['rotateqrcode'] = 'Rotate QR code';
-$string['rotateqrcodeinterval'] = 'Rotate QR code interval (seconds)';
-$string['rotateqrcodeinterval_desc'] = 'Time interval (seconds) to rotate QR codes by.';
+$string['rotateqrcodeinterval'] = 'Rotate QR code/password interval (seconds)';
+$string['rotateqrcodeinterval_desc'] = 'Time interval (seconds) to rotate QR code/password by.';
+$string['rotateqrcodeexpirymargin'] = 'Rotate QR code/password expiry margin (seconds)';
+$string['rotateqrcodeexpirymargin_desc'] = 'Time interval (seconds) to allow expired QR code/password by.';
 $string['rotateqrcode_cleartemppass_task'] = 'Task to clear temporary passwords generated by rotate QR code functionality.';
 $string['includeremarks'] = 'Include remarks';
 $string['incorrectpassword'] = 'You have entered an incorrect password and your attendance has not been recorded, please enter the correct password.';

settings.php

@@ -56,6 +56,10 @@ if ($ADMIN->fulltree) {
         get_string('rotateqrcodeinterval', 'attendance'),
         get_string('rotateqrcodeinterval_desc', 'attendance'), '15', PARAM_INT));
 
+    $settings->add(new admin_setting_configtext('attendance/rotateqrcodeexpirymargin',
+            get_string('rotateqrcodeexpirymargin', 'attendance'),
+            get_string('rotateqrcodeexpirymargin_desc', 'attendance'), '2', PARAM_INT));
+
     $settings->add(new admin_setting_configcheckbox('attendance/studentscanmarksessiontime',
         get_string('studentscanmarksessiontime', 'attendance'),
         get_string('studentscanmarksessiontime_desc', 'attendance'), 1));