一文搞懂Go整合captcha实现验证码功能

//GenerateImg 生成验证码图片名称
func GenerateImg(w http.ResponseWriter, req *http.Request) {
   w.Header().Set("Access-Control-Allow-Origin", "*")             //允许访问所有域
   w.Header().Add("Access-Control-Allow-Headers", "Content-Type") 
   d := struct {
      CaptchaId string
   }{
      captcha.New(),
   }
   bytes, _ := json.Marshal(map[string]interface{}{"code": 0, "msg": "", "count": 0, "data": d.CaptchaId})
   w.Write(bytes)
}
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func RunHttp(port string) {
   logger := log.Default()
   http.Header{}.Set("Access-Control-Allow-Origin", "*")
   http.HandleFunc("/user/login", controller.UserLogin) //登录API
   http.HandleFunc("/img", controller.GenerateImg)  //生成验证码图片API
   http.Handle("/verify/", captcha.Server(captcha.StdWidth, captcha.StdHeight)) //刷新验证码API
   logger.Println("Http Server Running port:", port, "...")
   http.ListenAndServe(":"+port, nil)
}
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func main() {
   web.RunHttp("8000")
}
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//UserLogin 用户登录
func UserLogin(w http.ResponseWriter, req *http.Request) {
   w.Header().Set("Access-Control-Allow-Origin", "*")
   w.Header().Add("Access-Control-Allow-Headers", "Content-Type")
   ......
   var m map[string]string
   body, err := ioutil.ReadAll(req.Body)
   if err != nil {
      panic(err)
   }
   json.Unmarshal(body, &m)
   var k = m["verify_key"]
   var v = m["verify_value"]
   res := captcha.VerifyString(k, v)
   if res { // 验证通过
     ......
   } else { // 验证未通过
     ......
   }
   ......
}
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......
<form class="layui-form" id="form">
    <h3 style="font-size: 20px;text-align: center;margin-bottom: 30px;">登录</h3>
    <div class="layui-form-item">
        <label class="layui-form-label">账号</label>
        <div class="layui-input-inline">
            <input type="text" id="loginName" placeholder="请输入账号" autocomplete="off"
                   class="layui-input">
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">密码</label>
        <div class="layui-input-inline">
            <input type="password" id="loginPwd" placeholder="请输入密码" autocomplete="off"
                   class="layui-input">
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">验证码</label>
        <div class="layui-input-inline">
            <input type="text" id="loginV" placeholder="请输入验证码" autocomplete="off"
                   class="layui-input">
        </div>
    </div>
    <div class="layui-form-item">
        <div class="layui-input-block">
            <button class="layui-btn" type="button" onclick="login()">立即提交</button>
            <button type="button" onclick="toRegister()" class="layui-btn layui-btn-primary">注册</button>
        </div>
    </div>
</form>
<img id="verify" onclick="reload()"></img>
......
<input type="hidden" id="verify_key">
</body>
<script src="//unpkg.com/layui@2.6.8/dist/layui.js"></script>
<script src="//cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
<script>
    const base_url = 'http://localhost:8000'
    init()
    function init() {
        $.ajax({
            url: base_url + "/img",
            type: "GET",
            success: function (res) {
                var obj = JSON.parse(res)
                $("#verify").attr("src", base_url + "/verify/" + obj.data + ".png")
                $("#verify_key").attr("value", obj.data)
            }
        })
    }
    function reload() {
        var url = $("#verify").attr("src");
        $("#verify").attr("src", url + "?reload=" + (new Date()).getTime())
    }
    function login() {
        var loginName = $("#loginName").val()
        var loginPwd = $("#loginPwd").val()
        var verify_key = $("#verify_key").val()
        var loginV = $("#loginV").val()
        var data = {
            'login_name': loginName,
            'pwd': loginPwd,
            'verify_key': verify_key,
            'verify_value': loginV
        }
        $.ajax({
            url: base_url + "/user/login",
            type: "POST",
            data: JSON.stringify(data),
            success: function (res) {
               ......
            },
            ......
        })
    }
   ......
</script>
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w.Header().Set("Access-Control-Allow-Origin", "*")             //允许访问所有域
w.Header().Add("Access-Control-Allow-Headers", "Content-Type") 
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var (
   RDB          *redis.Client
   TokenTimeOut = time.Second * 3600
)
func init() {
   RDB = redis.NewClient(&redis.Options{
      Addr:     "127.0.0.1:6379",
      Password: "",
      DB:       0,
   })
}
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type StoreImpl struct {
   RDB        *redis.Client
   Expiration time.Duration
}
func (impl *StoreImpl) Set(id string, digits []byte) {
   impl.RDB.Set(context.Background(), id, string(digits), impl.Expiration)
}
func (impl *StoreImpl) Get(id string, clear bool) (digits []byte) {
   bytes, _ := impl.RDB.Get(context.Background(), id).Bytes()
   return bytes
}
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//GenerateImg 生成验证码图片名称
func GenerateImg(w http.ResponseWriter, req *http.Request) {
   w.Header().Set("Access-Control-Allow-Origin", "*")             //允许访问所有域
   w.Header().Add("Access-Control-Allow-Headers", "Content-Type") //header的类型
   //需要在New之前进行指定
   captcha.SetCustomStore(&verify.StoreImpl{
      RDB:        dao.RDB,
      Expiration: time.Second * 1000,
   })
   d := struct {
      CaptchaId string
   }{
      captcha.New(),
   }
   bytes, _ := json.Marshal(map[string]interface{}{"code": 0, "msg": "", "count": 0, "data": d.CaptchaId})
   w.Write(bytes)
}
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