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auth.go
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auth.go
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package v1
import (
"crypto/rsa"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
"sync"
"time"
vgcrypto "zuluprotocol/zeta/libs/crypto"
vgrand "zuluprotocol/zeta/libs/rand"
"github.com/dgrijalva/jwt-go/v4"
"go.uber.org/zap"
)
const (
LengthForSessionHashSeed = 10
jwtBearer = "Bearer "
)
var ErrSessionNotFound = errors.New("session not found")
type auth struct {
log *zap.Logger
// sessionID -> wallet name
sessions map[string]string
privKey *rsa.PrivateKey
pubKey *rsa.PublicKey
tokenExpiry time.Duration
mu sync.Mutex
}
func NewAuth(log *zap.Logger, cfgStore RSAStore, tokenExpiry time.Duration) (Auth, error) { //revive:disable:unexported-return
keys, err := cfgStore.GetRsaKeys()
if err != nil {
return nil, err
}
priv, err := jwt.ParseRSAPrivateKeyFromPEM(keys.Priv)
if err != nil {
return nil, fmt.Errorf("couldn't parse private RSA key: %w", err)
}
pub, err := jwt.ParseRSAPublicKeyFromPEM(keys.Pub)
if err != nil {
return nil, fmt.Errorf("couldn't parse public RSA key: %w", err)
}
return &auth{
sessions: map[string]string{},
privKey: priv,
pubKey: pub,
log: log,
tokenExpiry: tokenExpiry,
}, nil
}
type Claims struct {
jwt.StandardClaims
Session string
Wallet string
}
func (a *auth) NewSession(walletName string) (string, error) {
a.mu.Lock()
defer a.mu.Unlock()
expiresAt := time.Now().Add(a.tokenExpiry)
session := genSession()
claims := &Claims{
Session: session,
Wallet: walletName,
StandardClaims: jwt.StandardClaims{
// these are seconds
ExpiresAt: jwt.NewTime((float64)(expiresAt.Unix())),
Issuer: "zeta wallet",
},
}
token := jwt.NewWithClaims(jwt.SigningMethodPS256, claims)
ss, err := token.SignedString(a.privKey)
if err != nil {
a.log.Error("unable to sign token", zap.Error(err))
return "", err
}
a.sessions[session] = walletName
return ss, nil
}
// VerifyToken returns the wallet name associated for this session.
func (a *auth) VerifyToken(token string) (string, error) {
a.mu.Lock()
defer a.mu.Unlock()
claims, err := a.parseToken(token)
if err != nil {
return "", err
}
walletName, ok := a.sessions[claims.Session]
if !ok {
return "", ErrSessionNotFound
}
return walletName, nil
}
func (a *auth) Revoke(token string) (string, error) {
a.mu.Lock()
defer a.mu.Unlock()
claims, err := a.parseToken(token)
if err != nil {
return "", err
}
w, ok := a.sessions[claims.Session]
if !ok {
return "", ErrSessionNotFound
}
delete(a.sessions, claims.Session)
return w, nil
}
func (a *auth) RevokeAllToken() {
a.mu.Lock()
defer a.mu.Unlock()
a.sessions = map[string]string{}
}
func (a *auth) parseToken(tokenStr string) (*Claims, error) {
token, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(t *jwt.Token) (interface{}, error) {
return a.pubKey, nil
})
if err != nil {
return nil, fmt.Errorf("couldn't parse JWT token: %w", err)
}
if !token.Valid {
return nil, ErrInvalidToken
}
if claims, ok := token.Claims.(*Claims); ok {
return claims, nil
}
return nil, ErrInvalidClaims
}
func extractToken(r *http.Request) (string, error) {
token := strings.TrimSpace(r.Header.Get("Authorization"))
if !strings.HasPrefix(token, jwtBearer) {
return "", ErrInvalidOrMissingToken
}
return strings.TrimSpace(token[len(jwtBearer):]), nil
}
func genSession() string {
return hex.EncodeToString(vgcrypto.Hash(vgrand.RandomBytes(LengthForSessionHashSeed)))
}
func writeError(w http.ResponseWriter, e error) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusBadRequest)
buf, err := json.Marshal(e)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
_, err = w.Write(buf)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
}
}