From df1240049a184396b08117a440c0d5bc38f47031 Mon Sep 17 00:00:00 2001
From: Sergey Skrobotov <sergey@signal.org>
Date: Thu, 18 Apr 2024 11:46:48 -0700
Subject: [PATCH] Add a remote config option to disable libsignal transport in
 prod

---
 ts/RemoteConfig.ts             |  1 +
 ts/textsecure/SocketManager.ts | 10 ++++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/ts/RemoteConfig.ts b/ts/RemoteConfig.ts
index 42aea244e..ed9a06211 100644
--- a/ts/RemoteConfig.ts
+++ b/ts/RemoteConfig.ts
@@ -27,6 +27,7 @@ export type ConfigKeyType =
   | 'desktop.senderKeyMaxAge'
   | 'desktop.experimentalTransportEnabled.alpha'
   | 'desktop.experimentalTransportEnabled.beta'
+  | 'desktop.experimentalTransportEnabled.prod'
   | 'desktop.cdsiViaLibsignal'
   | 'global.attachments.maxBytes'
   | 'global.attachments.maxReceiveBytes'
diff --git a/ts/textsecure/SocketManager.ts b/ts/textsecure/SocketManager.ts
index 5cbb0abb1..9dee7b338 100644
--- a/ts/textsecure/SocketManager.ts
+++ b/ts/textsecure/SocketManager.ts
@@ -559,8 +559,14 @@ export class SocketManager extends EventListener {
         : TransportOption.ShadowingLow;
     }
 
-    // in prod, using original
-    return TransportOption.ShadowingLow;
+    // in prod, switch to using 'ShadowingHigh' mode, unless user opts out,
+    // in which case switching to `ShadowingLow`
+    const configValue = window.Signal.RemoteConfig.isEnabled(
+      'desktop.experimentalTransportEnabled.prod'
+    );
+    return configValue
+      ? TransportOption.ShadowingLow
+      : TransportOption.Original;
   }
 
   private connectLibsignalUnauthenticated(): AbortableProcess<IWebSocketResource> {