go - 无法调用Go-gin中间件

Question

我正在学习并尝试使用go-gin框架创建一个简单的api，
我试图创建一个用于验证的中间件，但是当我将其称为validations.signupValidator() is undifined时
来自nodejs表达的东西似乎有些不同，在此先感谢您的帮助
中间件

package validations

import (
    "github.com/bihire/ikaze_server_app/entity"
    "net/http"
    "github.com/gin-gonic/gin"
    "gopkg.in/validator.v2"
)


func signupValidator(ctx *gin.Context) {
    var user entity.User
    // if err := ctx.ShouldBindJSON(&user); err != nil {
    //    ctx.JSON(http.StatusBadRequest, gin.H{
    //        "error": err.Error(),
    //    })
    // }

    if err := validator.Validate(user); err != nil {
        ctx.JSON(http.StatusBadRequest, gin.H{
            "error": err.Error(),
        })
    }
}

称它为

package routes

import (
    "github.com/gin-gonic/gin"
    "github.com/bihire/ikaze_server_app/service"
    "github.com/bihire/ikaze_server_app/controller"
    "github.com/bihire/ikaze_server_app/validations"
)

var (
    userController controller.UserController = controller.New(UserService)
)

func Routes(route *gin.Engine) {
    auth := route.Group("/api/auth")
    {
        
        auth.POST("login", gin.Logger(), validations.signupValidator(), func(ctx *gin.Context) {
            ctx.JSON(200, userController.Save(ctx))
        })
    }
}

Answer 1

您必须先导出signupValidation，因为它位于另一个软件包中。
为此，只需将其更改为大写:SignupValidation

package validations

import (
    "github.com/bihire/ikaze_server_app/entity"
    "net/http"
    "github.com/gin-gonic/gin"
    "gopkg.in/validator.v2"
)


func SignupValidator(ctx *gin.Context) {
    var user entity.User
    // if err := ctx.ShouldBindJSON(&user); err != nil {
    //    ctx.JSON(http.StatusBadRequest, gin.H{
    //        "error": err.Error(),
    //    })
    // }

    if err := validator.Validate(user); err != nil {
        ctx.JSON(http.StatusBadRequest, gin.H{
            "error": err.Error(),
        })
    }
}

第二:
Gin 中间件就是用这个签名 func (ctx *gin.Context)制作的。
您可以通过2种方式进行操作:
首先，如果您不想更改注册

package routes

import (
    "github.com/gin-gonic/gin"
    "github.com/bihire/ikaze_server_app/service"
    "github.com/bihire/ikaze_server_app/controller"
    "github.com/bihire/ikaze_server_app/validations"
)

var (
    userController controller.UserController = controller.New(UserService)
)

func Routes(route *gin.Engine) {
    auth := route.Group("/api/auth")
    {
        
        auth.POST("login", gin.Logger(), validations.SignupValidator, func(ctx *gin.Context) {
            ctx.JSON(200, userController.Save(ctx))
        })
    }
}

或者，更改注册:

func SignupValidator(ctx *gin.Context) gin.HandlerFunc {
    return func(c *gin.Context) {
      var user entity.User
      // if err := ctx.ShouldBindJSON(&user); err != nil {
      //    ctx.JSON(http.StatusBadRequest, gin.H{
      //        "error": err.Error(),
      //    })
      // }

      if err := validator.Validate(user); err != nil {
          ctx.JSON(http.StatusBadRequest, gin.H{
              "error": err.Error(),
          })
          return
      }
      c.Next()
   }
}

然后，您可以使用 validations.signupValidator()在此处查看示例: https://github.com/gin-gonic/gin#custom-middleware