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mcbot.go
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mcbot.go
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// Package bot implements a simple Minecraft client that can join a server
// or just ping it for getting information.
//
// Runnable example could be found at examples/ .
package bot
import (
"context"
"errors"
"net"
"strconv"
"github.com/google/uuid"
"github.com/SkyVillageMC/go-mc/chat"
"github.com/SkyVillageMC/go-mc/data/packetid"
mcnet "github.com/SkyVillageMC/go-mc/net"
pk "github.com/SkyVillageMC/go-mc/net/packet"
"github.com/SkyVillageMC/go-mc/yggdrasil/user"
)
// ProtocolVersion is the protocol version number of minecraft net protocol
const (
ProtocolVersion = 761
DefaultPort = mcnet.DefaultPort
)
type JoinOptions struct {
MCDialer mcnet.MCDialer
Context context.Context
// Indicate not to fetch and sending player's PubKey
NoPublicKey bool
// Specify the player PubKey to use.
// If nil, it will be obtained from Mojang when joining
KeyPair *user.KeyPairResp
}
// JoinServer connect a Minecraft server for playing the game.
// Using roughly the same way to parse address as minecraft.
func (c *Client) JoinServer(addr string) (err error) {
return c.join(addr, JoinOptions{
Context: context.Background(),
MCDialer: &mcnet.DefaultDialer,
})
}
// JoinServerWithDialer is similar to JoinServer but using a net.Dialer.
func (c *Client) JoinServerWithDialer(dialer *net.Dialer, addr string) (err error) {
return c.join(addr, JoinOptions{
Context: context.Background(),
MCDialer: (*mcnet.Dialer)(dialer),
})
}
func (c *Client) JoinServerWithOptions(addr string, options JoinOptions) (err error) {
if options.MCDialer == nil {
options.MCDialer = &mcnet.DefaultDialer
}
if options.Context == nil {
options.Context = context.Background()
}
return c.join(addr, options)
}
func (c *Client) join(addr string, options JoinOptions) error {
const Handshake = 0x00
// Split Host and Port. The DialMCContext will do this once,
// but we need the result for sending handshake packet here.
host, portStr, err := net.SplitHostPort(addr)
var port uint64
if err != nil {
var addrErr *net.AddrError
const missingPort = "missing port in address"
if errors.As(err, &addrErr) && addrErr.Err == missingPort {
host = addr
port = 25565
} else {
return LoginErr{"split address", err}
}
} else {
port, err = strconv.ParseUint(portStr, 0, 16)
if err != nil {
return LoginErr{"parse port", err}
}
}
// Dial connection
c.Conn, err = options.MCDialer.DialMCContext(options.Context, addr)
if err != nil {
return LoginErr{"connect server", err}
}
// Handshake
err = c.Conn.WritePacket(pk.Marshal(
Handshake,
pk.VarInt(ProtocolVersion), // Protocol version
pk.String(host), // Host
pk.UnsignedShort(port), // Port
pk.VarInt(2),
))
if err != nil {
return LoginErr{"handshake", err}
}
// Login Start
c.UUID, err = uuid.Parse(c.Auth.UUID)
PlayerUUID := pk.Option[pk.UUID, *pk.UUID]{
Has: err == nil,
Val: pk.UUID(c.UUID),
}
err = c.Conn.WritePacket(pk.Marshal(
packetid.LoginStart,
pk.String(c.Auth.Name),
PlayerUUID,
))
if err != nil {
return LoginErr{"login start", err}
}
receiving := "encrypt start"
for {
// Receive Packet
var p pk.Packet
if err = c.Conn.ReadPacket(&p); err != nil {
return LoginErr{receiving, err}
}
// Handle Packet
switch p.ID {
case packetid.LoginDisconnect: // LoginDisconnect
var reason chat.Message
err = p.Scan(&reason)
if err != nil {
return LoginErr{"disconnect", err}
}
return LoginErr{"disconnect", DisconnectErr(reason)}
case packetid.LoginEncryptionRequest: // Encryption Request
if err := handleEncryptionRequest(c, p); err != nil {
return LoginErr{"encryption", err}
}
receiving = "set compression"
case packetid.LoginSuccess: // Login Success
err := p.Scan(
(*pk.UUID)(&c.UUID),
(*pk.String)(&c.Name),
)
if err != nil {
return LoginErr{"login success", err}
}
return nil
case packetid.LoginCompression: // Set Compression
var threshold pk.VarInt
if err := p.Scan(&threshold); err != nil {
return LoginErr{"compression", err}
}
c.Conn.SetThreshold(int(threshold))
receiving = "login success"
case packetid.LoginPluginRequest: // Login Plugin Request
var (
msgid pk.VarInt
channel pk.Identifier
data pk.PluginMessageData
)
if err := p.Scan(&msgid, &channel, &data); err != nil {
return LoginErr{"Login Plugin", err}
}
var PluginMessageData pk.Option[pk.PluginMessageData, *pk.PluginMessageData]
if handler, ok := c.LoginPlugin[string(channel)]; ok {
PluginMessageData.Has = true
PluginMessageData.Val, err = handler(data)
if err != nil {
return LoginErr{"Login Plugin", err}
}
}
if err := c.Conn.WritePacket(pk.Marshal(
packetid.LoginPluginResponse,
msgid, PluginMessageData,
)); err != nil {
return LoginErr{"login Plugin", err}
}
}
}
}
type LoginErr struct {
Stage string
Err error
}
func (l LoginErr) Error() string {
return "bot: " + l.Stage + " error: " + l.Err.Error()
}
func (l LoginErr) Unwrap() error {
return l.Err
}
type DisconnectErr chat.Message
func (d DisconnectErr) Error() string {
return "disconnect because: " + chat.Message(d).String()
}