An example of golang's HTTP basic authentication mechanism

This article illustrates the basic HTTP authentication mechanism of golang. I will share it with you for your reference as follows:

Look at the < < The http authoritative guide > > Chapter 12 HTTP basic authentication mechanisms (site download address: https: / / www ofstack. com books / 93254 html), feeling pretty detailed, wrote a small example test.

Request response process:

==>

GET /hello HTTP/1.1

Host: 127.0.0.1:12345

<==

HTTP/1.1 401 Unauthorized

WWW-Authenticate: Basic realm="Dotcoo User Login"

==>

GET /hello HTTP/1.1

Host: 127.0.0.1:12345

Authorization: Basic YWRtaW46YWRtaW5wd2Q=

<==

HTTP/1.1 200 OK

Content-Type: text/plain; charset=utf-8

Implementation of golang HTTP basic authentication mechanism

package main

import (

    "fmt"

    "io"

    "net/http"

    "log"

    "encoding/base64"

    "strings"

)

// hello world, the web server

func HelloServer(w http.ResponseWriter, req *http.Request) {

    auth := req.Header.Get("Authorization")

    if auth == "" {

        w.Header().Set("WWW-Authenticate", `Basic realm="Dotcoo User Login"`)

        w.WriteHeader(http.StatusUnauthorized)

        return

    }

    fmt.Println(auth)

    auths := strings.SplitN(auth, " ", 2)

    if len(auths) != 2 {

        fmt.Println("error")

        return

    }

    authMethod := auths[0]

    authB64 := auths[1]

    switch authMethod {

    case "Basic":

        authstr, err := base64.StdEncoding.DecodeString(authB64)

        if err != nil {

            fmt.Println(err)

            io.WriteString(w, "Unauthorized!\n")

            return

        }

        fmt.Println(string(authstr))

        userPwd := strings.SplitN(string(authstr), ":", 2)

        if len(userPwd) != 2 {

            fmt.Println("error")

            return

        }

        username := userPwd[0]

        password := userPwd[1]

        fmt.Println("Username:", username)

        fmt.Println("Password:", password)

        fmt.Println()

    default:

        fmt.Println("error")

        return

    }

    io.WriteString(w, "hello, world!\n")

}

func main() {

    http.HandleFunc("/hello", HelloServer)

    err := http.ListenAndServe(":12345", nil)

    if err != nil {

        log.Fatal("ListenAndServe: ", err)

    }

}

I hope this article has been helpful to you in programming the Go language.