扫码登录 简单实现

简单原理是 服务器生成唯一的 key  附带到login 上
用户扫描 二维码 并且访问服务器 服务器反馈登录  状态
前端 页面 每隔一段时间扫描 服务器 当前的key是否扫描， 然后后续操作

代码：

package main

import (
	"fmt"
	"io"
	"math/rand"
	"net/http"
	"time"

	. "github.com/soekchl/myUtils"
)

const file = `




  
  



 


   
扫码登录
   



  

  





`

var (
	keyMap = make(map[string]int)
)

func HelloServer(w http.ResponseWriter, req *http.Request) {
	rand.Seed(time.Now().UnixNano())
	r := rand.Int()
	keyMap[fmt.Sprint(r)] = 1
	url := fmt.Sprint("http://10.0.82.88:8080/login?key=", r)
	Notice(url)
	io.WriteString(w, fmt.Sprintf(file, url))
}

func main() {
	http.HandleFunc("/", HelloServer)
	http.HandleFunc("/login", login)
	http.HandleFunc("/checkLogin", checkLogin)

	Notice("Server Start!")
	err := http.ListenAndServe(":8080", nil)
	if err != nil {
		panic("ListenAndServe: " + err.Error())
	}
}

func login(w http.ResponseWriter, req *http.Request) {
	key := req.FormValue("key")
	if keyMap[key] == 1 {
		Notice("login ok ", key)
		io.WriteString(w, fmt.Sprintf("", key))
		Notice(len(key))
		keyMap[key] = 2
	} else {
		Notice("login ", key)
		io.WriteString(w, fmt.Sprintf(""))
	}

}

func checkLogin(w http.ResponseWriter, req *http.Request) {
	key := req.FormValue("key")
	if keyMap[key] == 2 {
		Debug("checkLogin ok ", key)
		io.WriteString(w, "1") // 登录成功
	} else {
		io.WriteString(w, "0")
	}
}

这个东东弊端是 key 随处可见，只是用于 学习，用在商务的话 需要慎重！！！