Escape HTML in profile name preview in profile settings (#9446)

* fix non-escaped html in the profile settings

* provide a default profile text in case if there's no custom one

* update haml syntax

* simplify default profile name to username

* sanitize user-input html but display emojified icons

1 files changed, 6 insertions, 2 deletions

diff --git a/app/javascript/packs/public.js b/app/javascript/packs/public.js
index 36b1fd26b..6ba37c049 100644
--- a/app/javascript/packs/public.js
+++ b/app/javascript/packs/public.js
@@ -1,3 +1,4 @@
+import escapeTextContentForBrowser from 'escape-html';
 import loadPolyfills from '../mastodon/load_polyfills';
 import ready from '../mastodon/ready';
 import { start } from '../mastodon/common';
@@ -133,9 +134,12 @@ function main() {
 
   delegate(document, '#account_display_name', 'input', ({ target }) => {
     const name = document.querySelector('.card .display-name strong');
-
     if (name) {
-      name.innerHTML = emojify(target.value);
+      if (target.value) {
+        name.innerHTML = emojify(escapeTextContentForBrowser(target.value));
+      } else {
+        name.textContent = document.querySelector('#default_account_display_name').textContent;
+      }
     }
   });