From 5ed16355d78ea28472686f63e575839c4feefe15 Mon Sep 17 00:00:00 2001
From: Michael Kirk <michael@signal.org>
Date: Fri, 29 Mar 2019 10:09:50 -0600
Subject: [PATCH] iOS9 needs a different assertion

---
 SignalServiceKit/src/Network/SSKWebSocket.swift | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/SignalServiceKit/src/Network/SSKWebSocket.swift b/SignalServiceKit/src/Network/SSKWebSocket.swift
index c5724b1c1..b72a680ad 100644
--- a/SignalServiceKit/src/Network/SSKWebSocket.swift
+++ b/SignalServiceKit/src/Network/SSKWebSocket.swift
@@ -146,8 +146,13 @@ extension SSKWebSocketImpl: WebSocketDelegate {
         case let wsError as WSError:
             websocketError = SSKWebSocketError(underlyingError: wsError)
         case let nsError as NSError:
-            let networkDownCode = 50
-            assert(nsError.domain == "NSPOSIXErrorDomain" && nsError.code == networkDownCode)
+            // Assert that error is either a Starscream.WSError or an OS level networking error
+            if #available(iOS 10, *) {
+                let networkDownCode = 50
+                assert(nsError.domain == "NSPOSIXErrorDomain" && nsError.code == networkDownCode)
+            } else {
+                assert(nsError.domain == kCFErrorDomainCFNetwork as String)
+            }
             websocketError = error
         default:
             assert(error == nil, "unexpected error type: \(String(describing: error))")