fixes step 2

client/invitation/server/step2.go

@@ -62,29 +62,20 @@ func Step2ReadResponse(invitationData []byte, invitationServerUid string) (*meow
 	return meowlib.NewInvitationInitPayloadFromCompressed(serverMsg.Invitation.Payload)
 }
 
-// Step2PostAnswer builds and returns the packed server message that posts the
-// invitee's ContactCard (encrypted with the initiator's temp key) to the invitation server.
-func Step2PostAnswer(invitationId string, invitationServerUid string, timeout int) ([]byte, error) {
+// Step2PostAnswer wraps the invitee's already-built PackedUserMessage into a server
+// message and posts it to the invitation server. The packed message is produced by
+// messages.Step2InviteeCreatesInitiatorAndEncryptedContactCard.
+func Step2PostAnswer(invitationId string, packedMsg *meowlib.PackedUserMessage, invitationServerUid string, timeout int) ([]byte, error) {
 	peer := client.GetConfig().GetIdentity().Peers.GetFromInvitationId(invitationId)
 	if peer == nil {
 		return nil, errors.New("no peer with that invitation id")
 	}
 
-	answermsg, err := peer.BuildInvitationStep2Message(peer.GetMyContact())
-	if err != nil {
-		return nil, err
-	}
-
 	invitationServer, err := client.GetConfig().GetIdentity().MessageServers.LoadServer(invitationServerUid)
 	if err != nil {
 		return nil, err
 	}
 
-	packedMsg, err := peer.ProcessOutboundUserMessage(answermsg)
-	if err != nil {
-		return nil, err
-	}
-
 	toServerMessage, err := invitationServer.BuildToServerMessageInvitationAnswer(packedMsg, peer.MyIdentity.Public, invitationId, timeout)
 	if err != nil {
 		return nil, err