【Go实战 | 电商平台】(5) 用户登录

• 1. 路由注册
• 2. 接口编写
• • 2.1 service层
  • 2.2 api层
  • 2.3 service
• 3. 登陆测试

• 定义一个用户登录路由

v1.POST("user/login", api.UserLogin)

• 定义用户登录的服务结构

//UserLoginService 管理用户登陆的服务
type UserLoginService struct {
	UserName  string `form:"user_name" json:"user_name" binding:"required,min=5,max=15"`
	Password  string `form:"password" json:"password" binding:"required,min=8,max=16"`
}

• 编写用户登录的服务方法

func (service *UserLoginService) Login() serializer.Response {
	...
}

• 定义用户登录的服务

var userLoginService service.UserLoginService

• 绑定数据

c.ShouldBind(&userLoginService)

• 运行userLoginService对象的login方法

res := userLoginService.Login()

• 用户登录的接口函数返回

c.JSON(200, res)

• 用户登录接口的完整代码

func UserLogin(c *gin.Context) {
	var userLoginService service.UserLoginService
	if err := c.ShouldBind(&userLoginService); err == nil {
		res := userLoginService.Login()
		c.JSON(200, res)
	} else {
		c.JSON(400, ErrorResponse(err))
		logging.Info(err)
	}
}

• 查询用户是否存在

	if err := model.DB.Where("user_name=?", service.UserName).First(&user).Error; err != nil {
		//如果查询不到，返回相应的错误
		if gorm.IsRecordNotFoundError(err) {
			logging.Info(err)
			code = e.ErrorNotExistUser
			return serializer.Response{
				Status: code,
				Msg:    e.GetMsg(code),
			}
		}
		logging.Info(err)
		code = e.ErrorDatabase
		return serializer.Response{
			Status: code,
			Msg:    e.GetMsg(code),
		}
	}

• 在model/user下进行密码

//CheckPassword 校验密码
func (user *User) CheckPassword(password string) bool {
	err := bcrypt.CompareHashAndPassword([]byte(user.PasswordDigest), []byte(password))
	return err == nil
}

• 验证用户密码

	if user.CheckPassword(service.Password) == false {
		code = e.ErrorNotCompare
		return serializer.Response{
			Status: code,
			Msg:    e.GetMsg(code),
		}
	}

• 给用户签发token

token, err := util.GenerateToken(service.UserName, service.Password, 0)

• 定义claims的结构体

type Claims struct {
	ID 		  uint 	`json:"id"`
	Username  string `json:"username"`
	Authority int    `json:"authority"`
	jwt.StandardClaims
}

• 生成token函数
  我们传入用户的id，username和password以及authority权限加密成token，后续就可以进行身份的验证

func GenerateToken(id uint ,username, password string, authority int) (string, error) {
	nowTime := time.Now()
	expireTime := nowTime.Add(24 * time.Hour)
	claims := Claims{
		Username:  username,
		Password:  password,
		Authority: authority,
		StandardClaims: jwt.StandardClaims{
			ExpiresAt: expireTime.Unix(),
			Issuer:    "cmall",
		},
	}
	tokenClaims := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	token, err := tokenClaims.SignedString(jwtSecret)
	return token, err
}

• 用户登录服务的完整代码

func (service *UserLoginService) Login() serializer.Response {
	var user model.User
	code := e.SUCCESS
	if err := model.DB.Where("user_name=?", service.UserName).First(&user).Error; err != nil {
		//如果查询不到，返回相应的错误
		if gorm.IsRecordNotFoundError(err) {
			logging.Info(err)
			code = e.ErrorNotExistUser
			return serializer.Response{
				Status: code,
				Msg:    e.GetMsg(code),
			}
		}
		logging.Info(err)
		code = e.ErrorDatabase
		return serializer.Response{
			Status: code,
			Msg:    e.GetMsg(code),
		}
	}
	if user.CheckPassword(service.Password) == false {
		code = e.ErrorNotCompare
		return serializer.Response{
			Status: code,
			Msg:    e.GetMsg(code),
		}
	}
	token, err := util.GenerateToken(user.ID, service.UserName, 0)
	if err != nil {
		logging.Info(err)
		code = e.ErrorAuthToken
		return serializer.Response{
			Status: code,
			Msg:    e.GetMsg(code),
		}
	}
	return serializer.Response{
		Status: code,
		Data:   serializer.TokenData{User: serializer.BuildUser(user), Token: token},
		Msg:    e.GetMsg(code),
	}
}