如何验证来自中间件 go-gin 的数据

Question

尝试学习 golang，我迷失在验证中间件中使用context.Request.Body它struct简要介绍它们如何相互连接，在此先感谢您的帮助我的中间件package validationsimport (    "github.com/bihire/ikaze_server_app/entity"    "net/http"    "github.com/gin-gonic/gin"    "github.com/go-playground/validator/v10")func SignupValidator(c *gin.Context) {    // user := c.Request.Body    var user entity.User    validate := validator.New()    if err := validate.Struct(&user); err != nil {        c.JSON(http.StatusBadRequest, gin.H{            "error": err.Error(),        })    }}我的结构package entitytype User struct {    Username         string `json:"username" validate:"required"`    Email            string `json:"email"  validate:"email"`    Password         string `json:"password" validate:"min=8,max=32,alphanum"`    ConfirmPassword  string `json:"confirm_password" validate:"eqfield=Password,required"`}返回响应错误{    "error": "Key: 'User.Username' Error:Field validation for 'Username' failed on the 'required' tag\nKey: 'User.Email' Error:Field validation for 'Email' failed on the 'email' tag\nKey: 'User.Password' Error:Field validation for 'Password' failed on the 'min' tag\nKey: 'User.ConfirmPassword' Error:Field validation for 'ConfirmPassword' failed on the 'required' tag"}{    "username": "bihire",    "email": "[e-mail]",    "password": "password",    "confirm_password": "password"}带中间件的路由器auth.POST("login", gin.Logger(), validations.SignupValidator, func(ctx *gin.Context) {            ctx.JSON(200, videoController.Save(ctx))        })

Answer 1

看起来你错过了return：

func SignupValidator(c *gin.Context) gin.HandlerFunc {

    return func(c *gin.Context) {

       var user entity.User

       if err := c.ShouldBindJSON(&user); err == nil {           

         validate := validator.New()

         if err := validate.Struct(&user); err != nil {

              c.JSON(http.StatusBadRequest, gin.H{

                 "error": err.Error(),

          })

          c.Abort()

          return

         }

       }

       c.Next()

    }

}

请注意，c.Abort()如果验证失败，我们会调用。这是因为 gin 调用链中的下一个函数，即使在您c.JSON()使用c.Next().