add web ui and user route

auth/jwt.go

@@ -1,6 +1,7 @@
 package auth
 
 import (
+	"fmt"
 	"os"
 	"time"
 
@@ -28,3 +29,20 @@ func GenerateUserToken(userId int64, expiryTime time.Time) (string, error) {
 
 	return token.SignedString([]byte(secretKey))
 }
+
+func ValidateUserToken(token string) (int64, error) {
+	claims := &UserClaims{}
+
+	parsed, err := jwt.ParseWithClaims(token, claims, func(t *jwt.Token) (any, error) {
+		return []byte(secretKey), nil
+	})
+	if err != nil {
+		return -1, fmt.Errorf("failed to parse token: %v", err)
+	}
+
+	if !parsed.Valid {
+		return -1, fmt.Errorf("invalid token")
+	}
+
+	return claims.UserID, nil
+}