From 2b6551d06aac930eaf947e2b97ecb36a1b60dd27 Mon Sep 17 00:00:00 2001
From: Germain Souquet <germain@souquet.com>
Date: Thu, 22 Apr 2021 16:17:53 +0100
Subject: [PATCH] Remove reliance on DOM API to generated message preview

---
 src/HtmlUtils.tsx                                   | 13 ++++++++-----
 .../room-list/previews/MessageEventPreview.ts       |  4 ++--
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/HtmlUtils.tsx b/src/HtmlUtils.tsx
index 1dc342fac5..6b2568d68c 100644
--- a/src/HtmlUtils.tsx
+++ b/src/HtmlUtils.tsx
@@ -130,11 +130,14 @@ export function sanitizedHtmlNode(insaneHtml: string) {
     return <div dangerouslySetInnerHTML={{ __html: saneHtml }} dir="auto" />;
 }
 
-export function sanitizedHtmlNodeInnerText(insaneHtml: string) {
-    const saneHtml = sanitizeHtml(insaneHtml, sanitizeHtmlParams);
-    const contentDiv = document.createElement("div");
-    contentDiv.innerHTML = saneHtml;
-    return contentDiv.innerText;
+export function getHtmlText(insaneHtml: string) {
+    return sanitizeHtml(insaneHtml, {
+        allowedTags: [],
+        allowedAttributes: {},
+        selfClosing: [],
+        allowedSchemes: [],
+        disallowedTagsMode: 'discard',
+    })
 }
 
 /**
diff --git a/src/stores/room-list/previews/MessageEventPreview.ts b/src/stores/room-list/previews/MessageEventPreview.ts
index deed7dcf2c..b900afc13f 100644
--- a/src/stores/room-list/previews/MessageEventPreview.ts
+++ b/src/stores/room-list/previews/MessageEventPreview.ts
@@ -20,7 +20,7 @@ import { MatrixEvent } from "matrix-js-sdk/src/models/event";
 import { _t } from "../../../languageHandler";
 import { getSenderName, isSelf, shouldPrefixMessagesIn } from "./utils";
 import ReplyThread from "../../../components/views/elements/ReplyThread";
-import { sanitizedHtmlNodeInnerText } from "../../../HtmlUtils";
+import { getHtmlText } from "../../../HtmlUtils";
 
 export class MessageEventPreview implements IPreview {
     public getTextFor(event: MatrixEvent, tagId?: TagID): string {
@@ -55,7 +55,7 @@ export class MessageEventPreview implements IPreview {
         }
 
         if (hasHtml) {
-            body = sanitizedHtmlNodeInnerText(body);
+            body = getHtmlText(body);
         }
 
         if (msgtype === 'm.emote') {