New server framework, an example, and compressed packet fixed.

server/ping.go

@@ -0,0 +1,74 @@
+package server
+
+import (
+	"encoding/json"
+
+	"github.com/Tnze/go-mc/chat"
+	"github.com/Tnze/go-mc/net"
+	pk "github.com/Tnze/go-mc/net/packet"
+	"github.com/google/uuid"
+)
+
+type ListPingHandler interface {
+	Name() string
+	Protocol() int
+	MaxPlayer() int
+	OnlinePlayer() int
+	PlayerSamples() []PlayerSample
+	Description() chat.Message
+}
+
+type PlayerSample struct {
+	Name string    `json:"name"`
+	ID   uuid.UUID `json:"id"`
+}
+
+func (s *Server) acceptListPing(conn *net.Conn) {
+	var p pk.Packet
+	for i := 0; i < 2; i++ { // Ping or List. Only allow check twice
+		err := conn.ReadPacket(&p)
+		if err != nil {
+			return
+		}
+
+		switch p.ID {
+		case 0x00: //List
+			var resp []byte
+			resp, err = s.listResp()
+			if err != nil {
+				break
+			}
+			err = conn.WritePacket(pk.Marshal(0x00, pk.String(resp)))
+		case 0x01: //Ping
+			err = conn.WritePacket(p)
+		}
+		if err != nil {
+			return
+		}
+	}
+}
+
+func (s *Server) listResp() ([]byte, error) {
+	var list struct {
+		Version struct {
+			Name     string `json:"name"`
+			Protocol int    `json:"protocol"`
+		} `json:"version"`
+		Players struct {
+			Max    int            `json:"max"`
+			Online int            `json:"online"`
+			Sample []PlayerSample `json:"sample"`
+		} `json:"players"`
+		Description chat.Message `json:"description"`
+		FavIcon     string       `json:"favicon,omitempty"`
+	}
+
+	list.Version.Name = s.ListPingHandler.Name()
+	list.Version.Protocol = s.ListPingHandler.Protocol()
+	list.Players.Max = s.ListPingHandler.MaxPlayer()
+	list.Players.Online = s.ListPingHandler.OnlinePlayer()
+	list.Players.Sample = s.ListPingHandler.PlayerSamples()
+	list.Description = s.ListPingHandler.Description()
+
+	return json.Marshal(list)
+}