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model.go
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model.go
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package main
import (
"bytes"
"crypto/md5"
"database/sql"
"errors"
"fmt"
"github.com/golang-jwt/jwt/v5"
"github.com/google/uuid"
"golang.org/x/crypto/scrypt"
"lukechampine.com/blake3"
"net/url"
"strings"
"time"
)
const (
SkinModelSlim string = "slim"
SkinModelClassic string = "classic"
)
func MakeNullString(s *string) sql.NullString {
if s == nil {
return sql.NullString{Valid: false}
}
new_string := *s
return sql.NullString{
String: new_string,
Valid: true,
}
}
func UnmakeNullString(ns *sql.NullString) *string {
if ns.Valid {
new_string := ns.String
return &new_string
}
return nil
}
func IsValidSkinModel(model string) bool {
switch model {
case SkinModelSlim, SkinModelClassic:
return true
default:
return false
}
}
func UUIDToID(uuid string) (string, error) {
if len(uuid) != 36 {
return "", errors.New("Invalid UUID")
}
return strings.ReplaceAll(uuid, "-", ""), nil
}
func IDToUUID(id string) (string, error) {
if len(id) != 32 {
return "", errors.New("Invalid ID")
}
return id[0:8] + "-" + id[8:12] + "-" + id[12:16] + "-" + id[16:20] + "-" + id[20:], nil
}
func (app *App) ValidatePlayerName(playerName string) error {
if app.TransientLoginEligible(playerName) {
return errors.New("name is reserved for transient login")
}
maxLength := app.Constants.MaxPlayerNameLength
if playerName == "" {
return errors.New("can't be blank")
}
if len(playerName) > maxLength {
return fmt.Errorf("can't be longer than %d characters", maxLength)
}
if !app.ValidPlayerNameRegex.MatchString(playerName) {
return fmt.Errorf("must match the following regular expression: %s", app.Config.ValidPlayerNameRegex)
}
return nil
}
func (app *App) ValidateUsername(username string) error {
return app.ValidatePlayerName(username)
}
func (app *App) ValidatePlayerNameOrUUID(player string) error {
err := app.ValidatePlayerName(player)
if err != nil {
_, err = uuid.Parse(player)
if err != nil {
return errors.New("not a valid player name or UUID")
}
return err
}
return nil
}
func MakeTransientUser(app *App, playerName string) (User, error) {
preimage := bytes.Join([][]byte{
[]byte("uuid"),
[]byte(playerName),
app.KeyB3Sum512,
}, []byte{})
sum := blake3.Sum512(preimage)
accountUUID, err := uuid.FromBytes(sum[:16])
if err != nil {
return User{}, err
}
apiToken, err := MakeAPIToken()
if err != nil {
return User{}, err
}
user := User{
UUID: accountUUID.String(),
Username: playerName,
FallbackPlayer: playerName,
PasswordSalt: []byte{},
PasswordHash: []byte{},
Clients: []Client{},
PlayerName: playerName,
PreferredLanguage: app.Config.DefaultPreferredLanguage,
SkinModel: SkinModelClassic,
BrowserToken: MakeNullString(nil),
APIToken: apiToken,
CreatedAt: time.Now(),
NameLastChangedAt: time.Now(),
}
return user, nil
}
func (app *App) TransientLoginEligible(playerName string) bool {
return app.Config.TransientUsers.Allow &&
app.TransientUsernameRegex.MatchString(playerName) &&
len(playerName) <= app.Constants.MaxPlayerNameLength
}
func (app *App) ValidatePassword(password string) error {
if password == "" {
return errors.New("can't be blank")
}
if len(password) < app.Config.MinPasswordLength {
message := fmt.Sprintf("password must be longer than %d characters", app.Config.MinPasswordLength)
return errors.New(message)
}
return nil
}
func OfflineUUID(playerName string) (string, error) {
str := "OfflinePlayer:" + playerName
hasher := md5.New()
hasher.Write([]byte(str))
md5Bytes := hasher.Sum(nil)
// https://hg.openjdk.org/jdk8/jdk8/jdk/file/tip/src/share/classes/java/util/UUID.java#l162
md5Bytes[6] &= 0x0f // clear version
md5Bytes[6] |= 0x30 // set to version 3
md5Bytes[8] &= 0x3f // clear variant
md5Bytes[8] |= 0x80 // set to IETF variant
offlineUUID, err := uuid.FromBytes(md5Bytes)
if err != nil {
return "", err
}
return offlineUUID.String(), nil
}
func IsValidPreferredLanguage(preferredLanguage string) bool {
switch preferredLanguage {
case "sq",
"ar",
"be",
"bg",
"ca",
"zh",
"hr",
"cs",
"da",
"nl",
"en",
"et",
"fi",
"fr",
"de",
"el",
"iw",
"hi",
"hu",
"is",
"in",
"ga",
"it",
"ja",
"ko",
"lv",
"lt",
"mk",
"ms",
"mt",
"no",
"nb",
"nn",
"pl",
"pt",
"ro",
"ru",
"sr",
"sk",
"sl",
"es",
"sv",
"th",
"tr",
"uk",
"vi":
return true
default:
return false
}
}
const SCRYPT_N = 32768
const SCRYPT_r = 8
const SCRYPT_p = 1
const SCRYPT_BYTES = 32
func HashPassword(password string, salt []byte) ([]byte, error) {
return scrypt.Key(
[]byte(password),
salt,
SCRYPT_N,
SCRYPT_r,
SCRYPT_p,
SCRYPT_BYTES,
)
}
func (app *App) SkinURL(hash string) (string, error) {
return url.JoinPath(app.FrontEndURL, "web/texture/skin/"+hash+".png")
}
func (app *App) InviteURL(invite *Invite) (string, error) {
url, err := url.JoinPath(app.FrontEndURL, "web/registration")
if err != nil {
return "", err
}
return url + "?invite=" + invite.Code, nil
}
func (app *App) UserSkinURL(user *User) (*string, error) {
if !user.SkinHash.Valid {
return nil, nil
}
url, err := app.SkinURL(user.SkinHash.String)
if err != nil {
return nil, err
}
return &url, nil
}
func (app *App) CapeURL(hash string) (string, error) {
return url.JoinPath(app.FrontEndURL, "web/texture/cape/"+hash+".png")
}
func MakeAPIToken() (string, error) {
return RandomBase62(16)
}
type Client struct {
UUID string `gorm:"primaryKey"`
ClientToken string
Version int
UserUUID string
User User
}
type TokenClaims struct {
jwt.RegisteredClaims
Version int `json:"version"`
StaleAt *jwt.NumericDate `json:"staleAt"`
}
var DISTANT_FUTURE time.Time = Unwrap(time.Parse(time.RFC3339Nano, "2038-01-01T00:00:00.000000000Z"))
func (app *App) MakeAccessToken(client Client) (string, error) {
var expiresAt time.Time
if app.Config.TokenExpireSec > 0 {
expiresAt = time.Now().Add(time.Duration(app.Config.TokenExpireSec) * time.Second)
} else {
expiresAt = DISTANT_FUTURE
}
var staleAt time.Time
if app.Config.TokenStaleSec > 0 {
staleAt = time.Now().Add(time.Duration(app.Config.TokenStaleSec) * time.Second)
} else {
staleAt = DISTANT_FUTURE
}
token := jwt.NewWithClaims(jwt.SigningMethodRS512,
TokenClaims{
RegisteredClaims: jwt.RegisteredClaims{
Subject: client.UUID,
IssuedAt: jwt.NewNumericDate(time.Now()),
ExpiresAt: jwt.NewNumericDate(expiresAt),
Audience: nil,
Issuer: "drasl",
},
Version: client.Version,
StaleAt: jwt.NewNumericDate(staleAt),
})
return token.SignedString(app.Key)
}
type StaleTokenPolicy int
const (
StalePolicyAllow StaleTokenPolicy = iota
StalePolicyDeny
)
func (app *App) GetClient(accessToken string, stalePolicy StaleTokenPolicy) *Client {
token, err := jwt.ParseWithClaims(accessToken, &TokenClaims{}, func(token *jwt.Token) (interface{}, error) {
return app.Key.Public(), nil
})
if err != nil {
return nil
}
if !token.Valid {
return nil
}
claims, ok := token.Claims.(*TokenClaims)
if !ok {
return nil
}
var client Client
result := app.DB.Preload("User").First(&client, "uuid = ?", claims.RegisteredClaims.Subject)
if result.Error != nil {
return nil
}
if stalePolicy == StalePolicyDeny && time.Now().After(claims.StaleAt.Time) {
return nil
}
if claims.Subject != client.UUID || claims.Version != client.Version {
return nil
}
return &client
}
type User struct {
IsAdmin bool
IsLocked bool
UUID string `gorm:"primaryKey"`
Username string `gorm:"unique;not null"`
PasswordSalt []byte `gorm:"not null"`
PasswordHash []byte `gorm:"not null"`
Clients []Client `gorm:"foreignKey:UserUUID"`
ServerID sql.NullString
PlayerName string `gorm:"unique;not null;type:text collate nocase"`
OfflineUUID string `gorm:"not null"`
FallbackPlayer string
PreferredLanguage string
BrowserToken sql.NullString `gorm:"index"`
APIToken string
SkinHash sql.NullString `gorm:"index"`
SkinModel string
CapeHash sql.NullString `gorm:"index"`
CreatedAt time.Time
NameLastChangedAt time.Time
}
func (app *App) GetSkinURL(user *User) (*string, error) {
if !user.SkinHash.Valid {
return nil, nil
}
url, err := app.SkinURL(user.SkinHash.String)
if err != nil {
return nil, err
}
return &url, nil
}
func (app *App) GetCapeURL(user *User) (*string, error) {
if !user.CapeHash.Valid {
return nil, nil
}
url, err := app.CapeURL(user.CapeHash.String)
if err != nil {
return nil, err
}
return &url, nil
}
type Invite struct {
Code string `gorm:"primaryKey"`
CreatedAt time.Time
}