recaptcha v2 的基本服务器集成

Question

有人可以帮我解决这个问题吗？我已经尝试了几个月，但只在 YouTube 和 Google 等上遇到了令人困惑的信息。我正在为时事通讯建立订阅表格。它只是一个电子邮件字段和一个提交按钮。我得到了一个非常简单的 php 代码，该表单工作正常，但如果没有 recaptcha，它就会暴露给机器人：<?php $email = $_POST['email'];$formcontent="From: $email \n";$recipient = "[e-mail]";$subject = "Subscribe";$mailheader = "From: $email \r\n";mail($recipient, $subject, $formcontent, $mailheader) or die("Error!");echo "You have subscribed. You may close this tab now etc etc.";?>这就是我所需要的。此代码位于 mail.php 文件中，我在表单中使用 action="mail.php"，该表单位于单独的 html 文件中。有人可以建议我添加额外的代码来添加 SecretKey 并进行一些基本的 recaptcha 服务器集成吗？我无法理解 Google 信息网站。他们使用我从未遇到过的术语。我不知道他们想说什么。

Answer 1

如果您在表单上使用了 recaptcha，那么在提交表单时，PHP 中的 $_POST 将具有“g-recaptcha-response”。然后，您可以使用curl向Google发出API请求以验证他们的响应。

以下是非常基础的内容，未经测试。您将需要做更多的工作来改善用户体验，例如使用 Ajax

<?php

function verifyRecaptcha($response)

{

  //Replace the below with your secret key

  $recaptchaSecret = '<google_recaptcha_secret_key>';

  $ch = curl_init('https://www.google.com/recaptcha/api/siteverify');

  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

  curl_setopt($ch, CURLOPT_POST, true);

  curl_setopt($ch, CURLOPT_POSTFIELDS, array(

      'secret' => $recaptchaSecret,

      'response' => $response,

  ));

  $output = curl_exec($ch);

  curl_close($ch);

  //the response from Google will be a json string so decode it

  $output = json_decode($output);

  //one of the response keys is "success" which is a boolean

  return $output->success;

}

//First filter the POSTed data

$email = filter_input(INPUT_POST,'email',FILTER_VALIDATE_EMAIL);

$captchaResponse = filter_input(INPUT_POST,'g-recaptcha-response',FILTER_SANITIZE_STRING);

//If either email or catcha reponse is missing then one or both were not completed before submit

if(empty($email) || empty($captchaResponse))

{

  //TODO: Better error handling here

  echo "There was an error with the submitted data.";

}

elseif(!verifyRecaptcha($captchaResponse))  //this calls the above function to make the curl request

{

  //TODO: Better error handling here

  echo "Recaptcha verification failed.";

}

else

{

  //I would suggest you don't use their email as the "From" address, rather it should be a domain

  //that is allowed to send email from the server

  //Instead you want to use their email as the "Reply-To" address

  $formcontent = "From: $email \n";

  $recipient = "[e-mail]";

  $subject = "Subscribe";

  $mailheader = "From: $email \r\n";

  mail($recipient, $subject, $formcontent, $mailheader) or die("Error!");

  echo "You have subscribed. You may close this tab now etc etc.";

}

Answer 2

顺便说一句，这是形式：

<form class="form" action="mail5.php" method="POST">

<p class="email">

<input type="text" name="email" id="email" placeholder="[e-mail]" required />

</p>

<div class="g-recaptcha" data-sitekey="My Public Key"></div>

<p class="submit">

<input type="submit" value="Subscribe!" />

</p>

</form>

在我得到这个之前：

<script src="https://www.google.com/recaptcha/api.js" async defer></script>