first commit

pkg/jwt/jwt.go

@@ -0,0 +1,64 @@
+package jwt
+
+import (
+	"errors"
+	"os"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type Claims struct {
+	UserID   uint   `json:"user_id"`
+	Email    string `json:"email"`
+	UserName string `json:"username,omitempty"`
+	jwt.RegisteredClaims
+}
+
+// GenerateAccessToken creates a short-lived access token (15 minutes).
+func GenerateAccessToken(userID uint, email, userName string) (string, error) {
+	secret := os.Getenv("JWT_SECRET")
+	claims := Claims{
+		UserID:   userID,
+		Email:    email,
+		UserName: userName,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(15 * time.Minute)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	return jwt.NewWithClaims(jwt.SigningMethodHS256, claims).SignedString([]byte(secret))
+}
+
+// GenerateRefreshToken creates a long-lived refresh token (7 days).
+func GenerateRefreshToken(userID uint, email, userName string) (string, error) {
+	secret := os.Getenv("JWT_REFRESH_SECRET")
+	claims := Claims{
+		UserID:   userID,
+		Email:    email,
+		UserName: userName,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(7 * 24 * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	return jwt.NewWithClaims(jwt.SigningMethodHS256, claims).SignedString([]byte(secret))
+}
+
+// ValidateToken parses and validates a token string using the provided secret.
+func ValidateToken(tokenStr, secret string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(t *jwt.Token) (interface{}, error) {
+		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, errors.New("unexpected signing method")
+		}
+		return []byte(secret), nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	claims, ok := token.Claims.(*Claims)
+	if !ok || !token.Valid {
+		return nil, errors.New("invalid token")
+	}
+	return claims, nil
+}