enhance(user):打通用户登录功能，调整程序基本结构。

controller/user.go

@@ -0,0 +1,49 @@
+package controller
+
+import (
+	"electricity_bill_calc/exceptions"
+	"electricity_bill_calc/model"
+	"electricity_bill_calc/response"
+	"electricity_bill_calc/service"
+	"net/http"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func InitializeUserHandlers(router *fiber.App) {
+	router.Post("/login", doLogin)
+}
+
+type _LoginForm struct {
+	Username string `json:"uname"`
+	Password string `json:"upass"`
+	Type     int16  `json:"type"`
+}
+
+func doLogin(c *fiber.Ctx) error {
+	result := response.NewResult(c)
+	loginData := new(_LoginForm)
+	if err := c.BodyParser(loginData); err != nil {
+		return result.Error(http.StatusInternalServerError, "表单解析失败。")
+	}
+	var (
+		session *model.Session
+		err     error
+	)
+	if loginData.Type == model.USER_TYPE_ENT {
+		session, err = service.UserService.ProcessEnterpriseUserLogin(loginData.Username, loginData.Password)
+	} else {
+		session, err = service.UserService.ProcessManagementUserLogin(loginData.Username, loginData.Password)
+	}
+	if err != nil {
+		if authError, ok := err.(*exceptions.AuthenticationError); ok {
+			if authError.NeedReset {
+				return result.LoginNeedReset()
+			}
+			return result.Error(int(authError.Code), authError.Message)
+		} else {
+			return result.Error(http.StatusInternalServerError, err.Error())
+		}
+	}
+	return result.LoginSuccess(session)
+}