refactor invitation

client/invitation/server/step3.go

@@ -0,0 +1,51 @@
+package server
+
+import (
+	"errors"
+
+	"forge.redroom.link/yves/meowlib/client"
+)
+
+// Step3PostCard builds and returns the packed server messages that send the
+// initiator's full ContactCard to the invitee through the invitee's servers.
+// Step 3 must NOT use DR or sym layers: the invitee hasn't received those keys yet
+// (they are carried inside this very message). Plain asym encryption is used.
+func Step3PostCard(invitationId string) ([][]byte, error) {
+	id := client.GetConfig().GetIdentity()
+	peer := id.Peers.GetFromInvitationId(invitationId)
+	if peer == nil {
+		return nil, errors.New("no peer for invitation id " + invitationId)
+	}
+
+	step3msg, err := peer.BuildInvitationStep3Message(peer.GetMyContact())
+	if err != nil {
+		return nil, err
+	}
+	serialized, err := peer.SerializeUserMessage(step3msg)
+	if err != nil {
+		return nil, err
+	}
+	enc, err := peer.AsymEncryptMessage(serialized)
+	if err != nil {
+		return nil, err
+	}
+	packedMsg := peer.PackUserMessage(enc.Data, enc.Signature)
+
+	var results [][]byte
+	for _, srvUid := range peer.ContactPullServers {
+		srv, err := id.MessageServers.LoadServer(srvUid)
+		if err != nil {
+			continue
+		}
+		toSrvMsg := srv.BuildToServerMessageFromUserMessage(packedMsg)
+		bytemsg, err := srv.ProcessOutboundMessage(toSrvMsg)
+		if err != nil {
+			continue
+		}
+		results = append(results, bytemsg)
+	}
+	if len(results) == 0 {
+		return nil, errors.New("could not build message for any invitee server")
+	}
+	return results, nil
+}