Added player identification

server/game/Login.go

@@ -3,61 +3,75 @@ package game
 import (
 	"crypto/rand"
 	"encoding/base64"
+	"encoding/binary"
 	"encoding/json"
 	"errors"
 	"net"
 	"server/game/packet"
 )
 
-var (
-	LoginSuccess = []byte{0}
-	LoginFailure = []byte{1}
+const (
+	Success = 0
+	Failure = 1
 )
 
 // Login checks the account credentials and gives a network peer access to an account.
 func (game *Game) Login(data []byte, address *net.UDPAddr, server *Server) error {
+	if game.players.Get(address) != nil {
+		server.Send(packet.Login, []byte{Failure}, address)
+		return errors.New("already logged in")
+	}
+
 	username, password, err := getLoginData(data)
 
 	if err != nil {
-		server.Send(packet.Login, LoginFailure, address)
+		server.Send(packet.Login, []byte{Failure}, address)
 		return err
 	}
 
+	account := GetAccountByName(username)
+
+	if account == nil {
+		server.Send(packet.Login, []byte{Failure}, address)
+		return errors.New("unknown account name")
+	}
+
 	if password != "password" {
-		server.Send(packet.Login, LoginFailure, address)
+		server.Send(packet.Login, []byte{Failure}, address)
 		return errors.New("login failure")
 	}
 
-	player := game.players.Get(address)
-	player.AuthToken = createAuthToken()
-	player.Name = username
+	player := game.players.Add(address, account)
+	player.authToken = createAuthToken()
 	player.KeepAlive()
 
-	if username == "user0" {
-		player.Position.X = 5.0
-	}
+	response := []byte{Success}
+	response = appendString(response, account.ID)
+	response = appendString(response, player.authToken)
+	server.Send(packet.Login, response, address)
 
-	if username == "user1" {
-		player.Position.X = -5.0
-	}
+	game.onLogin(player)
+	return nil
+}
 
-	if username == "user2" {
-		player.Position.Z = -5.0
-	}
-
-	if username == "user3" {
-		player.Position.Z = 5.0
-	}
-
-	server.Send(packet.Login, append(LoginSuccess, []byte(player.AuthToken)...), address)
-	player.OnConnect()
+func appendString(data []byte, str string) []byte {
+	data = binary.LittleEndian.AppendUint32(data, uint32(len(str)))
+	data = append(data, []byte(str)...)
+	return data
+}
 
+// Inform the newly logged in player about existing players.
+// Also inform existing players about the newly logged in player.
+func (game *Game) onLogin(player *Player) {
 	game.players.Each(func(other *Player) bool {
-		server.Send(packet.PlayerState, other.State(), address)
+		game.server.Send(packet.PlayerAdd, other.State(), player.address)
+
+		if other != player {
+			game.server.Send(packet.PlayerAdd, player.State(), other.address)
+		}
+
 		return true
 	})
-
-	return nil
 }
 
 func getLoginData(data []byte) (string, string, error) {