From 326cad221229479af32e4094ce7da6f65a457c23 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Fri, 22 Apr 2022 13:35:18 +0100
Subject: [PATCH] Fix retrieving cross-signing signatures in
 `/user/devices/{userId}`

We need to know the target device IDs in order to get the signatures and we weren't populating those.
---
 federationapi/routing/devices.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/federationapi/routing/devices.go b/federationapi/routing/devices.go
index 4cd199960..8890eac4b 100644
--- a/federationapi/routing/devices.go
+++ b/federationapi/routing/devices.go
@@ -43,6 +43,9 @@ func GetUserDevices(
 		},
 	}
 	sigRes := &keyapi.QuerySignaturesResponse{}
+	for _, dev := range res.Devices {
+		sigReq.TargetIDs[userID] = append(sigReq.TargetIDs[userID], gomatrixserverlib.KeyID(dev.DeviceID))
+	}
 	keyAPI.QuerySignatures(req.Context(), sigReq, sigRes)
 
 	response := gomatrixserverlib.RespUserDevices{