Building Middleware with Negroni

Reasons use middleware, including logging requests, authenticating and authorizing users, and mapping resources.

Idiomatic HTTP Middleware for Golang. https://github.com/urfave/negroni

Install the negroni package.

go get github.com/urfave/negroni

PS: How to solve the go get can not work in China. Following is the best solution so far. https://github.com/goproxy/goproxy.cn

$ go env -w GO111MODULE=on
$ go env -w GOPROXY=https://goproxy.cn,direct

Negroni example

package main

import (
"github.com/gorilla/mux"
"github.com/urfave/negroni"
"net/http"
) func main() {
r := mux.NewRouter()
n := negroni.Classic()
n.UseHandler(r)
http.ListenAndServe(":8000",n)
}

Build and execute this program.

Create trivial middleware that prints a message and passes execution to the next middleware in the chain:

package main

import (
"fmt"
"github.com/gorilla/mux"
"github.com/urfave/negroni"
"net/http"
) type trivial struct {
} func (t *trivial) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
fmt.Println("Executing trivial middleware")
next(w, r)
} func main() {
r := mux.NewRouter()
n := negroni.Classic()
n.UseHandler(r)
n.Use(&trivial{})
http.ListenAndServe(":8000",n)
}

Build and test this new program.

Adding Authentication with Negroni

Use of context, which can easily pass variables between functions.  

package main

import (
"context"
"fmt"
"net/http" "github.com/gorilla/mux"
"github.com/urfave/negroni"
) type badAuth struct {
Username string
Password string
} func (b *badAuth) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
username := r.URL.Query().Get("username")
password := r.URL.Query().Get("password")
if username != b.Username && password !=b.Password {
http.Error(w, "Unauthorized", 401)
return
}
ctx := context.WithValue(r.Context(), "username", username)
r = r.WithContext(ctx)
next(w, r)
} func hello(w http.ResponseWriter, r * http.Request) {
username := r.Context().Value("username").(string)
fmt.Fprintf(w, "Hi %s\n", username)
} func main() {
r := mux.NewRouter()
r.HandleFunc("/hello",hello).Methods("GET")
n := negroni.Classic()
n.Use(&badAuth{
Username: "admin",
Password: "password",
})
n.UseHandler(r)
http.ListenAndServe(":8000", n) }

Build and excute this program. Then test it by sending a few requests to the server.

curl -i http://localhost:8000/hello
curl -i 'http://localhost:8000/hello?username=admin&password=password'

Logs on the server-side.

Go Pentester - HTTP Servers(3)的更多相关文章

  1. Go Pentester - HTTP Servers(2)

    Routing with the gorilla/mux Package A powerful HTTP router and URL matcher for building Go web serv ...

  2. Go Pentester - HTTP Servers(1)

    HTTP Server Basics Use net/http package and useful third-party packages by building simple servers. ...

  3. Coping with the TCP TIME-WAIT state on busy Linux servers

    Coping with the TCP TIME-WAIT state on busy Linux servers 文章源自于:https://vincent.bernat.im/en/blog/20 ...

  4. How To Restart timer service on all servers in farm

    [array]$servers= Get-SPServer | ? {$_.Role -eq "Application"} $farm = Get-SPFarm foreach ( ...

  5. eclipse Run On Server 异常:could not load the Tomcat Server configuration at Servers\tomcat V5.0 Sertomcat

    eclipse Run On Server 异常:could not load the Tomcat Server configuration at Servers\tomcat V5.0 Serto ...

  6. coderforces #387 Servers(模拟)

    Servers time limit per test 2 seconds memory limit per test 256 megabytes input standard input outpu ...

  7. Servers

    Servers¶ Server interface. class novaclient.v1_1.servers.Server(manager, info, loaded=False) Bases: ...

  8. 使用servers 启动项目时 ,一直处于启动中, 最后出现无法的问题。

    使用eclipse 中的servers 配置了一个server 来启动项目, 发现无法启动 排除法: 去掉项目配置,单独启动该server ,发现可以启动, 说明是项目出现问题 但是项目并没有报错, ...

  9. servers中添加server时,看不到运行环境的选择。

    servers中添加server时,看不到运行环境的选择. 主要原因是tomcat目录中的配置文件格式不对.

随机推荐

  1. python基础内容整理(一)

    基本数据类型 字符串 String 字符串是不可变类型 字符串的分割: s.split(sep)以给定的sep为分隔符对s进行分割. In [4]: s = "hello world&quo ...

  2. MFC编辑框接收数据动态更新与刷新方法代码示例-如何让编辑框内容实时更新

    MFC编辑框接收数据动态更新与刷新方法代码示例-如何让编辑框内容实时更新 关键代码: //发送数据通知 //from txwtech@163.com LRESULT CCommSampleDlg::O ...

  3. thinkphp3.2 where 条件查询

    thinkphp3.2 where 条件查询 在连贯操作中条件where的操作有时候自己很晕,所以整理下,有助于使用 查询条件 支持的表达式查询,tp不区分大小写 含义 TP运算符 SQL运算符 例子 ...

  4. 记一次mysql小版本升级

    最近护网操作比较紧,基线和漏洞检查比较频繁,新扫描出来的mysql漏洞需要修复,没有啥好的修复方法,只剩下升级版本这一条路,生产环境是5.7.12,二进制文件直接解压使用的,看了一下现在最新的版本,5 ...

  5. FIS3安装与编译

    安装 FIS3 npm install -g fis3 -g 安装到全局目录,必须使用全局安装,当全局安装后才能在命令行(cmd或者终端)找到 fis3 命令 安装过程中遇到问题具体请参考 fis#5 ...

  6. vue多个项目公共化组件方案

    前言 最近项目需求,需要把两个vue项目多个一样的模块抽成公共化.考虑采用的方案 1.把公共部分独立出来一个项目,npm发布私有包,使用的项目npm install下载(目前下载使用出现配置错误) 存 ...

  7. python实现简单的SVM

    # -*- coding: utf-8 -*- from sklearn.svm import SVC import numpy as np print(X.shape,Y.shape) X = np ...

  8. 2020年学习目标之一——emacs

    这两天在虚机里面安装了centos7(gnome),决定后续自己的学习一直在这个里面进行,对于编辑器我最后选择了emacs,新手一枚,不过正好也算是今年的一项学习目标吧,加油! (完)

  9. post发送请求参数注意的问题

  10. Mac上使用Docker Desktop启动Kubernetes,踩坑后终于搞掂

    1 前言 Kubernetes又简称k8s,是Google开源的容器集群管理系统,最近也是火热.闲来无事(为了发文),捣鼓了一下,在Mac上搭建Kubernetes,遇到一些坑,也记录一下. 另外,D ...