init

backend/internal/auth/jwt.go

@@ -0,0 +1,28 @@
+package auth
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+func GenerateToken(userID uint, jwtSecret string, options TokenOptions) (string, error) {
+	ttl := options.TTL
+	if ttl <= 0 {
+		ttl = 24 * time.Hour
+	}
+
+	now := time.Now()
+	claims := JWTClaims{
+		UserID: userID,
+		RegisteredClaims: jwt.RegisteredClaims{
+			Subject:   fmt.Sprintf("%d", userID),
+			IssuedAt:  jwt.NewNumericDate(now),
+			ExpiresAt: jwt.NewNumericDate(now.Add(ttl)),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(jwtSecret))
+}