Split server and serverlist + serverlist methods

client/serverlist.go

@@ -0,0 +1,49 @@
+package client
+
+import "errors"
+
+// ServerList manages lists that are used in Identity
+//   - Message servers list
+//   - ArchiveServers lists
+//   - Owned servers lists
+//   - Matriochka paths
+type ServerList struct {
+	Name    string
+	Servers []Server
+}
+
+// FilterByIdxs returns a filtered server list filtered according to an index list
+func (sl *ServerList) FilterByIdxs(MessageServerIdxs []int) (filtered *ServerList, err error) {
+	filtered.Servers = []Server{}
+	for _, i := range MessageServerIdxs {
+		if i > len(sl.Servers)-1 {
+			return nil, errors.New("requested server out of range of defined message servers")
+		}
+	}
+	for _, i := range MessageServerIdxs {
+		filtered.Servers = append(filtered.Servers, sl.Servers[i])
+	}
+	return filtered, nil
+}
+
+// GetServerByIdx returns a server from it's index
+func (sl *ServerList) GetServerByIdx(idx int) (server *Server, err error) {
+	return &sl.Servers[idx], nil
+}
+
+// GetServerByPubkey returns a server from it's public key
+func (sl *ServerList) GetServerByPubkey(pubkey string) (filtered *Server) {
+	for _, srv := range sl.Servers {
+		if srv.ServerData.PublicKey == pubkey {
+			return &srv
+		}
+	}
+	return nil
+}
+
+// AddUrls is a simple utility functon used mainly as a shortcut for testing purposes
+func (sl *ServerList) AddUrls(urls []string) {
+	for _, url := range urls {
+		sl.Servers = append(sl.Servers, *CreateServerFromUrl(url))
+	}
+}