Pass proxy down to libsignal Net instance

ts/textsecure/SocketManager.ts

@@ -169,7 +169,7 @@ export class SocketManager extends EventListener {
     const useLibsignalTransport =
       window.Signal.RemoteConfig.isEnabled(
         'desktop.experimentalTransport.enableAuth'
-      ) && this.#transportOption(proxyAgent) === TransportOption.Libsignal;
+      ) && this.#transportOption() === TransportOption.Libsignal;
 
     const process = useLibsignalTransport
       ? connectAuthenticatedLibsignal({
@@ -580,14 +580,7 @@ export class SocketManager extends EventListener {
     }
   }
 
-  #transportOption(proxyAgent: ProxyAgent | undefined): TransportOption {
-    const { hostname } = URL.parse(this.options.url);
-
-    // transport experiment doesn't support proxy
-    if (proxyAgent || hostname == null || !hostname.endsWith('signal.org')) {
-      return TransportOption.Original;
-    }
-
+  #transportOption(): TransportOption {
     // in staging, switch to using libsignal transport
     if (isStaging(this.options.version)) {
       return TransportOption.Libsignal;
@@ -643,7 +636,7 @@ export class SocketManager extends EventListener {
 
     log.info('SocketManager: connecting unauthenticated socket');
 
-    const transportOption = this.#transportOption(proxyAgent);
+    const transportOption = this.#transportOption();
     log.info(
       `SocketManager: connecting unauthenticated socket, transport option [${transportOption}]`
     );

ts/textsecure/WebAPI.ts

@@ -1726,6 +1726,10 @@ export function initialize({
     certificateAuthority
   );
   libsignalNet.setIpv6Enabled(!disableIPv6);
+  if (proxyUrl) {
+    log.info('Setting libsignal proxy');
+    libsignalNet.setProxyFromUrl(proxyUrl);
+  }
 
   // Thanks to function-hoisting, we can put this return statement before all of the
   //   below function definitions.