验证码

验证码分成两部分：一个是展示验证码的页面；一个是验证验证码。

于是我们可以先定义两个接口：

package controllers

import (
    web "github.com/beego/beego/v2/server/web"
    "github.com/beego/beego/v2/client/cache"
    "github.com/beego/beego/v2/server/web/captcha"
)

var cpt *captcha.Captcha

func init() {
    // use beego cache system store the captcha data
    store := cache.NewMemoryCache()
    cpt = captcha.NewWithFilter("/captcha/", store)
}

type MainController struct {
    web.Controller
}

func (this *MainController) Get() {
    this.TplName = "index.tpl"
}

func (this *MainController) Post() {
    this.TplName = "index.tpl"

    this.Data["Success"] = cpt.VerifyReq(this.Ctx.Request)
}

前端页面可以很简单：

{{.Success}}
<form action="/" method="post">
    {{create_captcha}}
    <input name="captcha" type="text">
</form>