如何使用Context.Request.Body并保留它? [英] How to use Context.Request.Body and retain it?

问题描述

我正在尝试编写一个中间件，在其中我将针对请求主体进行json模式验证.验证之后，我需要再次使用请求正文.但是我无法弄清楚如何做到这一点.我提到了这篇文章并找到了一种进入身体的方法.但是，一旦使用了请求正文，我就需要下一个函数可用.

I am trying to write a middleware where I will be doing a json schema validation against the request body. After the validation, I need to use the request body again. But I am not able to figure out how this can be done. I referred this post and found a way to access the body. But once the request body is used, I need that available to my next function.

这是示例代码:

package main
import (
        "fmt"
        "io/ioutil"
        "net/http"
        "github.com/gin-gonic/gin"
        //"github.com/xeipuuv/gojsonschema"
)

func middleware() gin.HandlerFunc {
 return func(c *gin.Context) {
    //Will be doing json schema validation here

    body := c.Request.Body
    x, _ := ioutil.ReadAll(body)

    fmt.Printf("%s \n", string(x))

    fmt.Println("I am a middleware for json schema validation")

    c.Next()
    return
 }
}    

type E struct {
 Email    string
 Password string
}

func test(c *gin.Context) {
 //data := &E{}
 //c.Bind(data)
 //fmt.Println(data)   //prints empty as json body is already used
 
 body := c.Request.Body
 x, _ := ioutil.ReadAll(body)

 fmt.Printf("body is: %s \n", string(x))
 c.JSON(http.StatusOK, c)
}

func main() {
 router := gin.Default()

 router.Use(middleware())

 router.POST("/test", test)

 //Listen and serve
 router.Run("127.0.0.1:8080")
}

当前输出:

{
    "email": "[e-mail]",
    "password": "123"
} 

I am a middleware for json schema validation
body is: 

预期输出:

{
    "email": "[e-mail]",
    "password": "123"
} 
I am a middleware for json schema validation
body is: {
    "email": "[e-mail]",
    "password": "123"
}

推荐答案

Thellimist所说的话，但用更多的词来表达.

What Thellimist said, but in more words.

您需要捕捉并恢复"身体.Body是一个缓冲区，这意味着一旦您阅读它，它就会消失.因此，如果您将其捕获并放回"，则可以再次访问它.

You need to "catch and restore" the Body. The Body is a buffer, that means that once you read it, its gone. So, if you catch it and "put it back", you can access it again.

检查此答案，我认为这是您要查找的内容: https://stackoverflow.com/a/47295689/3521313

Check this answer, I think this is what you are looking for: https://stackoverflow.com/a/47295689/3521313

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