From 7f27cdbf1ddc497221ef533d52331c513e5e8853 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Fri, 22 Mar 2019 21:00:59 -0700
Subject: [PATCH] modules/federation/state_ids: Seek an event_id before
 starting chunked encoding to allow 404.

---
 modules/federation/state_ids.cc | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/modules/federation/state_ids.cc b/modules/federation/state_ids.cc
index fde175b31..375cd5c9f 100644
--- a/modules/federation/state_ids.cc
+++ b/modules/federation/state_ids.cc
@@ -61,6 +61,13 @@ get__state_ids(client &client,
 		room
 	};
 
+	const m::event::auth::chain ac
+	{
+		event_id?
+			m::index(event_id):
+			m::head_idx(room)
+	};
+
 	resource::response::chunked response
 	{
 		client, http::OK
@@ -94,11 +101,6 @@ get__state_ids(client &client,
 			top, "auth_chain"
 		};
 
-		const m::event::auth::chain ac
-		{
-			m::index(event_id)
-		};
-
 		ac.for_each([&auth_chain]
 		(const m::event::idx &event_idx)
 		{