first commit

Made-with: Cursor

internal/auth/jwt.go

@@ -0,0 +1,67 @@
+package auth
+
+import (
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/google/uuid"
+)
+
+const (
+	AccessTokenDuration  = 15 * time.Minute
+	RefreshTokenDuration = 30 * 24 * time.Hour
+)
+
+type JWTManager struct {
+	secret []byte
+}
+
+type Claims struct {
+	UserID uuid.UUID `json:"user_id"`
+	jwt.RegisteredClaims
+}
+
+func NewJWTManager(secret string) *JWTManager {
+	return &JWTManager{secret: []byte(secret)}
+}
+
+func (m *JWTManager) GenerateAccessToken(userID uuid.UUID) (string, error) {
+	claims := Claims{
+		UserID: userID,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(AccessTokenDuration)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(m.secret)
+}
+
+func (m *JWTManager) GenerateRefreshToken(userID uuid.UUID) (string, error) {
+	claims := Claims{
+		UserID: userID,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(RefreshTokenDuration)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(m.secret)
+}
+
+func (m *JWTManager) ValidateToken(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, jwt.ErrSignatureInvalid
+		}
+		return m.secret, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	claims, ok := token.Claims.(*Claims)
+	if !ok || !token.Valid {
+		return nil, jwt.ErrSignatureInvalid
+	}
+	return claims, nil
+}