From dadc00caf181fb620e424a770e788ac2c35e2d96 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Tue, 9 Nov 2021 14:15:49 +0000
Subject: [PATCH] Return 403s on client API

---
 clientapi/routing/joinroom.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/clientapi/routing/joinroom.go b/clientapi/routing/joinroom.go
index 578aaec56..64ba59137 100644
--- a/clientapi/routing/joinroom.go
+++ b/clientapi/routing/joinroom.go
@@ -102,6 +102,10 @@ func JoinRoomByIDOrAlias(
 			JSON: jsonerror.Unknown("The room join will continue in the background."),
 		}
 	case result := <-done:
+		if !result.Is2xx() {
+			// The only error code in the spec for CS /join is 403.
+			result.Code = http.StatusForbidden
+		}
 		return result
 	}
 }