From 405cbc09ba3847042d6b21bb7fc898e83772cc09 Mon Sep 17 00:00:00 2001
From: Jake Dallimore <jake@moodle.com>
Date: Tue, 12 Sep 2017 08:32:45 +0800
Subject: [PATCH] MDL-59507 forms: accepted file types won't allow the .xxx
 extension

- Modified get_filetypes_browser_data() to exclude this extension.
- Server side form validation blocks this extension too.
---
 lib/form/classes/filetypes_util.php | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/form/classes/filetypes_util.php b/lib/form/classes/filetypes_util.php
index 4bebfd577b1..2dcbe2b894f 100644
--- a/lib/form/classes/filetypes_util.php
+++ b/lib/form/classes/filetypes_util.php
@@ -323,6 +323,10 @@ class filetypes_util {
         $others = [];
 
         foreach (core_filetypes::get_types() as $extension => $info) {
+            // Reserved for unknown file types. Not available here.
+            if ($extension === 'xxx') {
+                continue;
+            }
             $extension = '.'.$extension;
             if ($onlytypes && !$this->is_whitelisted($extension, $onlytypes)) {
                 continue;
@@ -496,6 +500,8 @@ class filetypes_util {
             if ($type === '*') {
                 // Any file is considered as a known type.
                 continue;
+            } else if ($type === '.xxx') {
+                $unknown[$type] = true;
             } else if ($this->is_filetype_group($type)) {
                 // The type is a group that exists.
                 continue;