出海企业系列风险分析--网站需要验证码吗？

最近接待了几位从discuz来的用户，说是想要给自己海外的网站安装验证码，但是discuz境外服务器还要解析安装中心的DNS到境外服务器上，所以基于discuz建站的不好之处就在这里。

而且我们还讨论到一个问题，海外的网站，需要用到滑动验证码吗？

经过激烈的“大战三百回合”，我们得出了结论：必须要。

原因有三：

防止恶意行为：国外的geek可比国内的嚣张多了，各种恶意攻击、刷票、撞库、暴力破解密码等
保护数据和内容：爬虫什么的，国外格外嚣张，而且各种破解工具开源
应对垃圾信息和垃圾账号：通过要求用户手动完成滑动验证，可以有效减少无意义的注册和发布垃圾信息的行为。尤其是对于内容类网站，比如说论坛。

所以说，如果想要做国外的网站或者是App，那么做好防护是必须的。而简单好用且便宜的动态验证码是首选。

今天就来教大家怎么去在自己海外的网站上安装验证码。

一、前端

01 找到相应的供应商。

可以在discuz找（如果是基于discuz建站的，那你就只有这一个选项），或者使用极验，或者其他提供免费服务的。我们以一家小公司AiSecruis的abtCaptcha为例（链接我就不放了，大家自行选择合适的即可，有需要可以一起交流：出海交流）。

02 确认自己网站

环境先决条件：兼容IE8+、Chrome、Firefox等主流浏览器。

03 激活服务

激活atbCAPTCHA服务：创建Applcation，获取apiServer、appld、appSecret；

脚本的使用：

<script src="https://cdn.aisecurius.com/ctu-group/captcha-ui/v5/index.js" crossorigin="anonymous" id="as-captcha-script"></script>

注意： atbCAPTCHA 脚本经常更新，请务必使用 CDN 上的资源获取最新的安全更新。不要在自己的服务器上使用副本。

04 初始化

以下是 valina JavaScript、React 和 Vue 演示。

1）JavaScript 示例

假设<div id="demo"></div>页面上有a，atbCAPTCHA可以按如下方式初始化。

var myCaptcha = as.Captcha(document.getElementById('demo'), {
  appId: 'your appId', // appId, Obtaining from the console "Application Management" or "Application Configuration" module,
  apiServer: 'https://cap.aisecurius.com',
  // apiServer, The domain name address is obtained in the top left corner of the console page -> atbCAPTCHA -> "Application Management" page. It is a must to fill in it completely, including https://.
  success: function (token) {
    console.log('token:', token)
    // The atbCAPTCHA token is obtained for back-end verification. Note that if the obtained token is a string starting with sl, it is a downgraded token generated by the front-end network blocked. Please check the front-end network and apiServer address.
  }
})

初始化后，abtCAPTCHA 组件将被插入到<div id="demo"></div>.

2) React 示例

假设页面上有<div id="demo"></div>abtCAPTCHA 可以初始化如下：

// class component use componentDidMount
useEffect(() => {
  as.Captcha(document.getElementById('demo'), {
    appId: 'appId',
    apiServer: 'https://xxx.xxx.com',
    success: function (token) {
      console.log('token:', token)
    }
  });
}, [])

初始化后，atbCAPTCHA 组件将被插入到<div id="demo"></div>.

3) Vue 示例

假设页面上有<div ref="demo"></div>abtCAPTCHA 可以初始化如下：

mounted() {
  as.Captcha(this.$refs.demo, {
    appId: 'appId',
    apiServer: 'https://xxx.xxx.com',
    success: function (token) {
      console.log('token:', token)
    }
  });
}

初始化后，atbCAPTCHA 组件将被插入到<div ref="demo"></div>.

4) 外观及尺寸

atbCAPTCHA 有四种样式：

embed 嵌入式（默认），这种样式下宽度默认为 300px，可通过初始化时的 width 参数调节，高度为 200px，高度不可调节
inline 内联式，这种样式占用面积较小，宽度默认为 300px，可通过初始化时的 width 参数调节，高度为 40px，高度不可调节
popup 弹出式，这种样式验证码默认不可见，调用 .show() 方法后将以浮层的形式展现，宽度为 300px，高度为 200px
oneclick 触发式，这种样式占用面积较小，宽度默认为 300px，可通过初始化时的 width 参数调节，高度为 40px，高度不可调节

05 Methods

atbCAPTCHA 实例具有以下方法：

reload() ：重新加载当前的 atbCAPTCHA

注意！请不要在成功回调中调用reload()，因为开启无感验证时会重复调用成功回调。

例子：

myCaptcha.reload()

show() ：显示当前的 atbCAPTCHA

如果显示当前的atbCAPTCHA，“style”为“popup”的验证码，默认隐藏。接入用户需要根据页面逻辑调用show()方法来显示和隐藏当前的atbCAPTCHA。

例子：

myCaptcha.show()

hide() ：隐藏当前验证码

例子：

myCaptcha.hide()

06 Event

abtCAPTCHA 可用于通过以下方式监听事件：

myCaptcha.on('ready', function () {
  console.log('captcha is ready!')
})

myCaptcha.on('verifySuccess', function (security_code) {
  console.log('security_code is: ' + security_code)
})

myCaptcha.on('hide', function () {
  console.log('The verification code control is hidden. ')
})

具体的样式与语言也是可以自定义操作的，具体可以根据自己的需求来。

二、后端

01 Java版本

下载Java7及以上版本的SDK。

Maven 依赖

<dependency>
  <groupId>com.aisecurius</groupId>
  <artifactId>ctu-security-sdk</artifactId>
  <version>3.0</version>
</dependency>

/** The initialization parameters are appid and appSecret 
 * The appid is consistent with the appid of the frontend, and the appid can be disclosed 
 * The appSecret is the secret key, please do not disclose it 
 * The token can be obtained after the verification is completed at the frontend and sent to the backend with the your Form/XHR request. The token is valid for two minutes 
 **/
String appId = "appId";
String appSecret = "appSecret";
CaptchaClient captchaClient = new CaptchaClient(appId,appSecret);
CaptchaResponse response = captchaClient.verifyToken(token);
System.out.println(response.getCaptchaStatus());
// A fault-tolerant mechanism is designed in the SDK, response.getResult() will be returned true if there is an exception in the network
if (response.getResult()) {
    /** The token verification passes, to continue other processes **/
} else {
    /** If the token verification fails, you can directly block the request or continue to pop up the CAPTCHA **/
}

02 PHP版本

下载PHP版SDK：点击下载

include ("CaptchaClient.php");
/** The initialization parameters are appid and appSecret 
 * The appid is consistent with the appid of the frontend, and the appid can be disclosed 
 * The appSecret is the secret key, please do not disclose it 
 * The token can be obtained after the verification is completed at the frontend and sent to the backend with the your Form/XHR request. The token is valid for two minutes 
 **/
$appId = "appId";
$appSecret = "appSecret";
$client = new CaptchaClient($appId,$appSecret);
$client->setTimeOut(2);      // Set the timeout, 2 seconds by default; 
$response = $client->verifyToken(token);  // ; The token refers to the value passed from the frontend, that is, the token issued after the verification code is successfully verified
echo $response->serverStatus;
// A fault-tolerant mechanism is designed in the SDK, response.getResult() will be returned true if there is an exception in the network
if($response->result){
    echo "true";
    /** the token verification passes, to continue other processes **/
}else{
    echo "false";
    /** Verification failed **/
}

03 Python版本

Python版本SDK下载：点击下载

from CaptchaClient import CaptchaClient

if __name__ == '__main__':
    APP_ID = '12610axxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
    APP_SECRET = 'a3e56cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
    captchaClient = CaptchaClient(APP_ID, APP_SECRET)
    captchaClient.setTimeOut(2)
    # Set the timeout, 2 seconds by default
    response = captchaClient.checkToken("token")
    print response['serverStatus']
    # A fault-tolerant mechanism is designed in the SDK, response.getResult() will be returned true if there is an exception in the network
    print response['result']
    if response['result']:
        # the token verification passes, to continue other processes; 
        pass
    else:
        # If the verification fails, you can directly block the request or continue to pop up the CAPTCHA 
        pass

04 Golang SDK

SDK下载地址

// Version Go 1.13 

import "./captcha-client"

/** The initialization parameters are appid and appSecret 
 * The appid is consistent with the appid of the frontend, and the appid can be disclosed 
 * The appSecret is the secret key, please do not disclose it 
 * The token can be obtained after the verification is completed at the frontend and sent to the backend with the your Form/XHR request. The token is valid for two minutes 
 **/
appId := "appId"
appSecret := "appSecret"
captchaClient := captcha_client.NewCaptchaClient(appId, appSecret)
//captchaClient.SetTimeout(2000)
// Set the timeout, in milliseconds, 2 seconds by default 
captchaResponse := captchaClient.VerifyToken(token)
// A fault-tolerant mechanism is designed in the SDK, response.getResult() will be returned true if there is an exception in the network
//fmt.Println(captchaResponse.Ip)
if captchaResponse.Result {
    /* The verification passes, to continue other processes  */
} else {
    /* If the verification fails, you can directly block the request or continue to pop up the CAPTCHA  */
}