add configuration support for /server packet

server/configuration.go

@@ -0,0 +1,39 @@
+package server
+
+import (
+	"github.com/Tnze/go-mc/chat"
+	"github.com/Tnze/go-mc/data/packetid"
+	"github.com/Tnze/go-mc/net"
+	pk "github.com/Tnze/go-mc/net/packet"
+	"github.com/Tnze/go-mc/registry"
+)
+
+type ConfigHandler interface {
+	AcceptConfig(conn *net.Conn) error
+}
+
+type Configurations struct {
+	Registries registry.NetworkCodec
+}
+
+func (c *Configurations) AcceptConfig(conn *net.Conn) error {
+	err := conn.WritePacket(pk.Marshal(
+		packetid.ClientboundConfigRegistryData,
+		pk.NBT(c.Registries),
+	))
+	if err != nil {
+		return err
+	}
+	err = conn.WritePacket(pk.Marshal(
+		packetid.ClientboundConfigFinishConfiguration,
+	))
+	return err
+}
+
+type ConfigFailErr struct {
+	reason chat.Message
+}
+
+func (c ConfigFailErr) Error() string {
+	return "config error: " + c.reason.ClearString()
+}

server/login.go

@@ -157,6 +157,15 @@ func (d *MojangLoginHandler) AcceptLogin(conn *net.Conn, protocol int32) (name s
 		pk.String(name),
 		pk.Array(properties),
 	))
+	if err != nil {
+		return
+	}
+
+	// receive login ack
+	err = conn.ReadPacket(&p)
+	if err == nil && packetid.ServerboundPacketID(p.ID) != packetid.ServerboundLoginAcknowledged {
+		err = wrongPacketErr{expect: int32(packetid.ServerboundLoginAcknowledged), get: p.ID}
+	}
 	return
 }
 

server/server.go

@@ -38,14 +38,15 @@ import (
 )
 
 const (
-	ProtocolName    = "1.19.4"
-	ProtocolVersion = 762
+	ProtocolName    = "1.20.2"
+	ProtocolVersion = 764
 )
 
 type Server struct {
 	*log.Logger
 	ListPingHandler
 	LoginHandler
+	ConfigHandler
 	GamePlay
 }
 
@@ -89,6 +90,20 @@ func (s *Server) AcceptConn(conn *net.Conn) {
 			}
 			return
 		}
+		s.AcceptConfig(conn)
+		if err != nil {
+			var configErr ConfigFailErr
+			if errors.As(err, &configErr) {
+				_ = conn.WritePacket(pk.Marshal(
+					packetid.ClientboundConfigDisconnect,
+					configErr.reason,
+				))
+			}
+			if s.Logger != nil {
+				s.Logger.Printf("client %v config error: %v", conn.Socket.RemoteAddr(), err)
+			}
+			return
+		}
 		s.AcceptPlayer(name, id, profilePubKey, properties, protocol, conn)
 	}
 }