auth.go

package middleware

import (
	"fmt"
	"strings"
	"time"

	"github.com/Arjuna-Ragil/Localbase/Internal/adapters/repository"
	"github.com/Arjuna-Ragil/Localbase/Internal/config"
	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
)

func AuthMiddleware(userRepo *repository.UserRepository, cfg *config.Config) gin.HandlerFunc {
	return func(c *gin.Context) {
		if cfg.AuthMode == "false" {
			c.Set("userID", uint(1))
			c.Set("userRole", "admin")
			c.Next()
			return
		}
		tokenString, err := c.Cookie("authorization")
		if tokenString == "" {
			authHeader := c.GetHeader("Authorization")
			if authHeader == "" {
				c.JSON(401, gin.H{
					"message": "Authorization header not found",
					"data":    err.Error(),
				})
				return
			}
			parts := strings.Split(authHeader, " ")
			if len(parts) == 2 {
				tokenString = parts[1]
			} else {
				tokenString = authHeader
			}
		}

		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
				return nil, fmt.Errorf("method unknown")
			}
			return []byte(cfg.SecretKey), nil
		})

		if err != nil || !token.Valid {
			c.JSON(401, gin.H{
				"message": "Invalid token",
				"data":    err.Error(),
			})
			return
		}

		if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
			if float64(time.Now().Unix()) > claims["exp"].(float64) {
				c.JSON(401, gin.H{
					"message": "Token expired",
					"data":    err.Error(),
				})
				return
			}
			subID := uint(claims["sub"].(float64))
			user, err := userRepo.FindById(subID)
			if err != nil {
				c.JSON(401, gin.H{
					"message": "User not found",
					"data":    err.Error(),
				})
				return
			}

			c.Set("userID", user.Id)
			c.Set("userRole", user.Role)
			c.Next()

		} else {
			c.JSON(401, gin.H{
				"message": "Invalid token",
				"data":    err.Error(),
			})
			return
		}
	}
}