added refresh tocken

internal/auth/handler.go

@@ -71,6 +71,36 @@ func (h *Handler) Login(c *gin.Context) {
 	c.JSON(http.StatusOK, resp)
 }
 
+// @Summary      Refresh epta token
+// @Description  Get a new access token using a refresh token
+// @Tags         auth
+// @Accept       json
+// @Produce      json
+// @Param        request  body  RefreshRequest  true  "Refresh token"
+// @Success      200  {object}  AuthResponse
+// @Failure      400  {object}  ErrorResponse
+// @Failure      401  {object}  ErrorResponse
+// @Router       /api/auth/refresh [post]
+func (h *Handler) Refresh(c *gin.Context) {
+	var req RefreshRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, ErrorResponse{Error: err.Error()})
+		return
+	}
+
+	resp, err := h.service.Refresh(c.Request.Context(), req.RefreshToken)
+	if err != nil {
+		if errors.Is(err, ErrInvalidRefresh) || errors.Is(err, ErrRefreshExpired) {
+			c.JSON(http.StatusUnauthorized, ErrorResponse{Error: err.Error()})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, ErrorResponse{Error: "internal server error"})
+		return
+	}
+
+	c.JSON(http.StatusOK, resp)
+}
+
 // @Summary      Epta get current user
 // @Description  Get authenticated user's profile
 // @Tags         auth