From 88953d5904be710bd2f4117fb525782d576e7c14 Mon Sep 17 00:00:00 2001
From: Ian Denhardt <ian@zenhack.net>
Date: Mon, 13 Feb 2023 19:00:35 -0500
Subject: [PATCH] recvCap: use the vine for thirdPartyHosted caps.

This will ease compatibility with future versions of go-capnp which
support 3PH; per the comments in rpc.capnp, implementations which do not
support 3PH can just use the vine to treat the capability just like
senderHosted.
---
 rpc/rpc.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rpc/rpc.go b/rpc/rpc.go
index 5d63e8a3..ff5ab3bc 100644
--- a/rpc/rpc.go
+++ b/rpc/rpc.go
@@ -1305,6 +1305,18 @@ func (c *lockedConn) recvCap(d rpccp.CapDescriptor) (capnp.Client, error) {
 		// >   rather than being delivered locally.
 		id := importID(d.SenderPromise())
 		return c.addImport(id), nil
+	case rpccp.CapDescriptor_Which_thirdPartyHosted:
+		// We don't support third-party handoff yet, so instead of trying to
+		// pick this up, use the vine and treat it the same as senderHosted:
+		thirdPartyDesc, err := d.ThirdPartyHosted()
+		if err != nil {
+			return capnp.Client{}, exc.WrapError(
+				"reading ThridPartyCapDescriptor",
+				err,
+			)
+		}
+		id := importID(thirdPartyDesc.VineId())
+		return c.addImport(id), nil
 	case rpccp.CapDescriptor_Which_receiverHosted:
 		id := exportID(d.ReceiverHosted())
 		ent := c.findExport(id)