From e09ebfffa0a7a7fdb3469f272de0e6930d97a336 Mon Sep 17 00:00:00 2001
From: PatrikKozak <35232443+PatrikKozak@users.noreply.github.com>
Date: Tue, 21 Mar 2023 09:33:16 -0400
Subject: [PATCH] fix: allows base64 thumbnails (#2361)

---
 src/admin/hooks/useThumbnail.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/admin/hooks/useThumbnail.ts b/src/admin/hooks/useThumbnail.ts
index 44e209c18c..4199623a81 100644
--- a/src/admin/hooks/useThumbnail.ts
+++ b/src/admin/hooks/useThumbnail.ts
@@ -3,6 +3,7 @@ import { SanitizedCollectionConfig } from '../../collections/config/types';
 import isImage from '../../uploads/isImage';
 
 const absoluteURLPattern = new RegExp('^(?:[a-z]+:)?//', 'i');
+const base64Pattern = new RegExp(/^data:image\/[a-z]+;base64,/);
 
 const useThumbnail = (collection: SanitizedCollectionConfig, doc: Record<string, unknown>): string | false => {
   const {
@@ -29,7 +30,7 @@ const useThumbnail = (collection: SanitizedCollectionConfig, doc: Record<string,
     if (typeof adminThumbnail === 'function') {
       const thumbnailURL = adminThumbnail({ doc });
 
-      if (absoluteURLPattern.test(thumbnailURL)) {
+      if (absoluteURLPattern.test(thumbnailURL) || base64Pattern.test(thumbnailURL)) {
         return thumbnailURL;
       }