Add server infrastructure with login, status, and kick handlers

server/status.go

@@ -0,0 +1,74 @@
+package server
+
+import (
+	"encoding/json"
+
+	"github.com/admin-else/strom/proto"
+	"github.com/admin-else/strom/proto_generated/v1_21_8"
+	"github.com/admin-else/strom/text"
+)
+
+// These are separate types so a status definition looks less ugly
+
+type StatusResponseVersion struct {
+	Name     *text.Component `json:"name"`
+	Protocol int32           `json:"protocol"`
+}
+
+type StatusResponseSample struct {
+	Name *text.Component `json:"name"`
+	ID   string          `json:"id"`
+}
+type StatusResponsePlayers struct {
+	Max    int                    `json:"max"`
+	Online int                    `json:"online"`
+	Sample []StatusResponseSample `json:"sample"`
+}
+
+// StatusResponse here is the structure I used: https://minecraft.wiki/w/Java_Edition_protocol/Server_List_Ping#Status_Response
+type StatusResponse struct {
+	Version            StatusResponseVersion `json:"version"`
+	Players            StatusResponsePlayers `json:"players"`
+	Description        *text.Component       `json:"description"`
+	Favicon            string                `json:"favicon"`
+	EnforcesSecureChat bool                  `json:"enforcesSecureChat"`
+}
+
+// MustMarshal is a utility for marshalling StatusResponse to JSON
+func (s StatusResponse) MustMarshal() []byte {
+	b, err := json.Marshal(s)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
+
+type StatusServer struct {
+	*proto.Conn
+	Status string
+}
+
+func (p *StatusServer) Default(_ any) (err error) {
+	return
+}
+
+func (p *StatusServer) OnStatusRequest(_ *v1_21_8.StatusToServerPacketPingStart) (err error) {
+	return p.Send(&v1_21_8.StatusToClientPacketServerInfo{Response: p.Status})
+}
+
+func (p *StatusServer) OnStatusPing(packet *v1_21_8.StatusToServerPacketPing) (err error) {
+	return p.Send(&v1_21_8.StatusToClientPacketPing{Time: packet.Time})
+}
+
+func ServeStatus(c *proto.Conn, s StatusResponse) (err error) {
+	status, err := json.Marshal(s)
+	if err != nil {
+		return
+	}
+	server := &StatusServer{
+		Conn:   c,
+		Status: string(status),
+	}
+	err = server.Start(server)
+	return
+}