Admin: Add configuration setting quiz_prevent_copy_paste to prevent copying questions/answers text with the keyboard or the right-click menu - refs BT#15208

main/exercise/exercise_result.php

@@ -71,6 +71,9 @@ $interbreadcrumb[] = [
 $htmlHeadXtra[] = '<script src="'.api_get_path(WEB_LIBRARY_JS_PATH).'hotspot/js/hotspot.js"></script>';
 $htmlHeadXtra[] = '<link rel="stylesheet" href="'.api_get_path(WEB_LIBRARY_JS_PATH).'hotspot/css/hotspot.css">';
 $htmlHeadXtra[] = '<script src="'.api_get_path(WEB_LIBRARY_JS_PATH).'annotation/js/annotation.js"></script>';
+if (api_get_configuration_value('quiz_prevent_copy_paste')) {
+    $htmlHeadXtra[] = '<script src="'.api_get_path(WEB_LIBRARY_JS_PATH).'jquery.nocopypaste.js"></script>';
+}
 
 if ($origin != 'learnpath') {
     // So we are not in learnpath tool

main/exercise/exercise_submit.php

@@ -63,6 +63,9 @@ $htmlHeadXtra[] = api_get_js('epiclock/renderers/minute/epiclock.minute.js');
 $htmlHeadXtra[] = '<link rel="stylesheet" href="'.api_get_path(WEB_LIBRARY_JS_PATH).'hotspot/css/hotspot.css">';
 $htmlHeadXtra[] = '<script src="'.api_get_path(WEB_LIBRARY_JS_PATH).'hotspot/js/hotspot.js"></script>';
 $htmlHeadXtra[] = '<script src="'.api_get_path(WEB_LIBRARY_JS_PATH).'annotation/js/annotation.js"></script>';
+if (api_get_configuration_value('quiz_prevent_copy_paste')) {
+    $htmlHeadXtra[] = '<script src="'.api_get_path(WEB_LIBRARY_JS_PATH).'jquery.nocopypaste.js"></script>';
+}
 
 if (api_get_setting('enable_record_audio') === 'true') {
     $htmlHeadXtra[] = '<script src="'.api_get_path(WEB_LIBRARY_JS_PATH).'rtc/RecordRTC.js"></script>';

main/inc/lib/javascript/jquery.nocopypaste.js

@@ -0,0 +1,25 @@
+/**
+ * When included, this snippet prevents contextual menus and keystrokes that
+ * make it possible to cut/paste/copy text from the page.
+ * This is useful for very secure exams.
+ * @author Alberto Torreblanca
+ */
+$(document).ready(function(){
+    $(document).on("cut copy paste contextmenu",function(e) {
+        e.preventDefault();
+    });
+    $(document).keydown(function(e) {
+        var forbiddenKeys = new Array('c', 'x', 'v', 'p', 's');
+        var keyCode = (e.keyCode) ? e.keyCode : e.which;
+        var isCtrl;
+        isCtrl = e.ctrlKey
+        if (isCtrl) {
+            for (i = 0; i < forbiddenKeys.length; i++) {
+                if (forbiddenKeys[i] == String.fromCharCode(keyCode).toLowerCase()) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    });
+});

main/install/configuration.dist.php

@@ -557,6 +557,9 @@ $_configuration['send_all_emails_to'] = [
 //$_configuration['allow_quiz_show_previous_button_setting'] = false;
 // Allow to teachers review exercises question with audio notes
 //$_configuration["allow_teacher_comment_audio"] = false;
+// Block copy/paste/save/print keys and right-clicks in exercises
+//$_configuration['quiz_prevent_copy_paste'] = false;
+
 // Hide search form in session list
 //$_configuration['hide_search_form_in_session_list'] = false;
 // Allow exchange of messages from teachers/bosses about a user.