feat: auth middleware;

fix: backend healthcheck

backend/internal/middleware/auth.go

@@ -0,0 +1,56 @@
+package middleware
+
+import (
+	"easywish/config"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type Claims struct {
+	Username string `json:"username"`
+	jwt.RegisteredClaims
+}
+
+func JWTAuthMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		cfg := config.GetConfig()
+		authHeader := c.GetHeader("Authorization")
+		if authHeader == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorization header required"})
+			return
+		}
+
+		tokenString := authHeader
+
+		token, err := jwt.ParseWithClaims(
+			tokenString, 
+			&Claims{}, 
+			func(token *jwt.Token) (any, error) {
+				if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+					return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
+				}
+				return []byte(cfg.JwtSecret), nil
+			},
+		)
+
+		if err != nil {
+			if errors.Is(err, jwt.ErrTokenExpired) {
+				c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Token expired"})
+			} else {
+				c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid token"})
+			}
+			return
+		}
+
+		if claims, ok := token.Claims.(*Claims); ok && token.Valid {
+			c.Set("userID", claims.Username)
+			c.Next()
+		} else {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid claims"})
+		}
+	}
+}