From b3ff2f1aea03abc803cfecf99eb59739122cb067 Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Mon, 9 Oct 2023 16:39:05 +0100
Subject: [PATCH] Decode base64url

---
 src/useE2eeConfig.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/useE2eeConfig.ts b/src/useE2eeConfig.ts
index d136c9b4..c2fb3bf0 100644
--- a/src/useE2eeConfig.ts
+++ b/src/useE2eeConfig.ts
@@ -32,7 +32,10 @@ export const useE2eeConfig = (
     // as such. Otherwise, we assume it's an old-style password and use it as a string.
     try {
       const itFunc = function* () {
-        const decoded = atob(passwordString);
+        const decoded = atob(
+          // built-in atob doesn't support base64url, so convert
+          passwordString.replace("-", "+").replace("_", "/")
+        );
         for (let i = 0; i < decoded.length; ++i) {
           yield decoded.charCodeAt(i);
         }