start through server invitation process

client/server.go

@@ -100,6 +100,24 @@ func (ints *InternalServer) BuildMessageRequestMessage(lookupKeys []string) ([]b
 	return out, nil
 }
 
+// Creates a basic message to server from a single packed user message and returns it as protobuf serialized byte array
+func (ints *InternalServer) BuildToServerMessageInvitation(invitation *meowlib.ContactCard, password string, timeout int, urllen int) (*meowlib.ToServerMessage, error) {
+	var msg meowlib.ToServerMessage
+	var inv meowlib.Invitation
+	payload, err := invitation.Compress()
+	if err != nil {
+		return nil, err
+	}
+	msg.Type = "1"
+	msg.From = ints.Me.Public
+	inv.Password = password
+	inv.Timeout = int32(timeout)
+	inv.Urllen = int32(urllen)
+	inv.Payload = payload
+	msg.Invitation = &inv
+	return &msg, nil
+}
+
 func (ints *InternalServer) PackServerMessage(payload []byte, signature []byte) (protoPackedMessage []byte, err error) {
 	var msg meowlib.PackedServerMessage
 	msg.From = ints.Me.Public

pb/messages.proto

@@ -15,6 +15,16 @@ message PackedServerMessage {
 	bytes signature = 3; // The message signature with the client public key |eo| the reference to teh symetrical key used
 }
 
+// structure to hold an invitation through a server
+message Invitation {
+    bytes payload = 1;
+    int32 timeout = 2;
+    int32 urllen = 3;
+    string password = 4;
+    string url = 5;
+    int64 expiry = 6;
+}
+
 // structure defining a message for a server, that will be encrypted, then sent in a "packedmessage" payload
 message ToServerMessage {
 	string type = 1; // Type 1 : final destination / 2 : forward 
@@ -39,6 +49,8 @@ message ToServerMessage {
     
     string uuid = 8;
 
+    Invitation invitation = 9;
+
 }
 
 // structure defining a from server receiver message decrypted from a "packedmessage" payload
@@ -57,6 +69,8 @@ message FromServerMessage {
 
     repeated Server knownServers = 7; 
 
+    Invitation invitation = 8;
+
 }
 
 message MatriochkaServer {