fixes step 2

client/invitation/messages/step2.go

@@ -6,17 +6,28 @@ import (
 )
 
 // Step2InviteeCreatesInitiatorAndEncryptedContactCard creates the invitee's peer entry
-// from an InvitationInitPayload and generates the encrypted ContactCard to be sent back
-// to the initiator via any transport.
-func Step2InviteeCreatesInitiatorAndEncryptedContactCard(payload *meowlib.InvitationInitPayload, nickname string, myNickname string, serverUids []string) (*client.Peer, error) {
+// from an InvitationInitPayload, then builds the invitee's ContactCard and returns it
+// as a PackedUserMessage asymmetrically encrypted with the initiator's temporary public
+// key. The packed message is ready to be transmitted to the initiator via any transport
+// (file, QR, server…); Step3InitiatorFinalizesInviteeAndCreatesContactCard on the
+// initiator side will decrypt and process it.
+func Step2InviteeCreatesInitiatorAndEncryptedContactCard(payload *meowlib.InvitationInitPayload, nickname string, myNickname string, serverUids []string) (*meowlib.PackedUserMessage, *client.Peer, error) {
 	mynick := myNickname
 	if mynick == "" {
 		mynick = client.GetConfig().GetIdentity().Nickname
 	}
 	peer, err := client.GetConfig().GetIdentity().InvitationStep2(mynick, nickname, serverUids, payload)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
+	}
+	usermsg, err := peer.BuildInvitationStep2Message(peer.GetMyContact())
+	if err != nil {
+		return nil, nil, err
+	}
+	packed, err := peer.ProcessOutboundUserMessage(usermsg)
+	if err != nil {
+		return nil, nil, err
 	}
 	client.GetConfig().GetIdentity().Save()
-	return peer, nil
+	return packed, peer, nil
 }