From 082d997eed2b9d848d2c497468fab9e504ba123d Mon Sep 17 00:00:00 2001
From: Eric Eastwood <contact@ericeastwood.com>
Date: Thu, 24 Feb 2022 12:13:05 -0600
Subject: [PATCH] Only try to use window.crypto.subtle in secure contexts to
 avoid it throwing and stopping all JavaScript

Related to https://github.com/vector-im/hydrogen-web/issues/579

```
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'deriveBits')
	at new Crypto
	at new Platform
	at mountHydrogen
```
---
 src/platform/web/Platform.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/platform/web/Platform.js b/src/platform/web/Platform.js
index 9de3d4ce..b6fdfae5 100644
--- a/src/platform/web/Platform.js
+++ b/src/platform/web/Platform.js
@@ -143,7 +143,10 @@ export class Platform {
             this._serviceWorkerHandler.registerAndStart(assetPaths.serviceWorker);
         }
         this.notificationService = new NotificationService(this._serviceWorkerHandler, config.push);
-        this.crypto = new Crypto(cryptoExtras);
+        // `window.crypto.subtle` is only available in a secure context
+        if(window.isSecureContext) {
+            this.crypto = new Crypto(cryptoExtras);
+        }
         this.storageFactory = new StorageFactory(this._serviceWorkerHandler);
         this.sessionInfoStorage = new SessionInfoStorage("hydrogen_sessions_v1");
         this.estimateStorageUsage = estimateStorageUsage;