PHP表单+ Google reCAPTCHA

Question

Google的recaptcha文档并没有像我想象的那样有用,这有点奇怪.我被要求采用当前现有的表格(每天发送几次垃圾邮件)并使用Google的新回程更新.旧的验证码有很多教程,但新的验证码并不多.我基本上只想要一个简单的表单来捕获名称,电子邮件,消息,然后用recaptcha替换我当前的"反机器人字段"(我使用的字段基本上问你2 + 2是什么,如果你输入任何东西,但是4,它不会发送).如果必填字段有效且recaptcha有效,那么我希望它向我发送一封包含表单字段内容的电子邮件.

我经历了简单的步骤:

1. 注册我的网站获取密钥
   

2. 在我的head标签中添加了这个片段:
   

   <script src='https://www.google.com/recaptcha/api.js'></script>
   

3. 在我的表单末尾添加了此代码段:
   

   <div class="g-recaptcha" data-sitekey="#MYKEY#"></div>
   

在这一点上,recaptcha正好显示出来.但服务器端部分有点令人困惑.

这是我更新的联系表格,其中包含recaptcha:

<form method="post" action="contact-post.php">
  <label>Your Name (required):</label>
    <input name="name" type="text" placeholder="Enter your name here">
  <label>Email Address (required):</label>
    <input name="email" type="email" placeholder="Enter your email address here">
  <label>Your Message (required):</label>
    <textarea name="message" placeholder="Write your message here"></textarea>
  <div style="margin-top:20px;" class="g-recaptcha" data-sitekey="#MYKEY#"></div>
  <input id="submit" name="submit" type="submit" value="Submit Form">
</form>

这是我当前的POST页面(我不确定在recaptcha代码中添加的位置):

<?php
        $name = $_POST['name'];
        $email = $_POST['email'];
        $message = $_POST['message'];
        $human = $_POST['human'];
        $from = 'From: My Website';
        $to = 'myemail@gmail.com';
        $subject = 'Request Form';

        $body = "Name: $name \n E-Mail: $email \nMessage:\n$message";

        if ($_POST['submit']) {
            if ($email != '') {
                if ($human == '4') {                 
                    if (mail ($to, $subject, $body, $from)) { 
                        echo '<p>You have successfully submitted your information to PS4RS. Subscribers to our mailing list will begin to periodically receive updates.</p>';
                    } else { 
                        echo '<p>Something went wrong, go back and try again!</p><p><input type="button" value="Go Back" onclick="history.back(-1)" class="goback" /></p>'; 
                    } 
                } else if ($_POST['submit'] && $human != '4') {
                    echo '<p>You answered the anti-spam question incorrectly!</p><p><input type="button" value="Go Back" onclick="history.back(-1)" class="goback" /></p>';
                }
            } else {
                echo '<p>You need to fill in all required fields!!</p><p><input type="button" value="Go Back" onclick="history.back(-1)" class="goback" /></p>';
            }
        }
    ?>

欢迎任何帮助.我觉得这可能是一个非常普通的人,人们试图将它实现到他们当前的工作形式.

Answer 1

请访问以下链接:https: //developers.google.com/recaptcha/docs/verify

In a few words, you should make request to

https://www.google.com/recaptcha/api/siteverify?secret=YOUR_SECRET&response=RESPONSE_CAME_FROM_YOUR_FORM&remoteip=USER_IP_ADDRESS  

Where YOUR_SECRET is secret key you received on ReCAPTCHA site, USER_IP_ADDRESS can be received through $_SERVER array and RESPONSE_CAME_FROM_YOUR_FORM is a string sent with your form. It is stored in $_POST['g-recaptcha-response'].

You can do it via file_get_contents($url) like

$data = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=YOUR_SECRET&response=RESPONSE_CAME_FROM_YOUR_FORM&remoteip=USER_IP_ADDRESS");

In $data you will receive JSON object containing success field, which you are looking for. If success is false, then it is not a human and you should exit(). I suggest you checking this in the beginning of your program.

Update:

Decoding of JSON object looks like:

$data = json_decode($data); // This will decode JSON to object
if(!$data->success) 
    exit();

Update:

Sometimes, file_get_contents($url) won't be able to set up secured https connection. Instead you can use open_https_url($url) Make your code look like:

<?php
    $your_secret = "<secret_key_you_received_from_recaptcha_site>";
    $client_captcha_response = $_POST['g-recaptcha-response'];
    $user_ip = $_SERVER['REMOTE_ADDR'];

    $captcha_verify = open_https_url("https://www.google.com/recaptcha/api/siteverify?secret=$your_secret&response=$client_captcha_response&remoteip=$user_ip");
    $captcha_verify_decoded = json_decode($captcha_verify);
    if(!$captcha_verify_decoded->success)
      die('DIRTY ROBOT');

    $name = $_POST['name'];
    $email = $_POST['email'];
    $message = $_POST['message'];
    $human = $_POST['human'];
    $from = 'From: My Website';
    $to = 'myemail@gmail.com';
    $subject = 'Request Form';

    $body = "Name: $name \n E-Mail: $email \nMessage:\n$message";

    if ($_POST['submit']) {
        if ($email != '') {
            if ($human == '4') {                 
                if (mail ($to, $subject, $body, $from)) { 
                    echo '<p>You have successfully submitted your information to PS4RS. Subscribers to our mailing list will begin to periodically receive updates.</p>';
                } else { 
                    echo '<p>Something went wrong, go back and try again!</p><p><input type="button" value="Go Back" onclick="history.back(-1)" class="goback" /></p>'; 
                } 
            } else if ($_POST['submit'] && $human != '4') {
                echo '<p>You answered the anti-spam question incorrectly!</p><p><input type="button" value="Go Back" onclick="history.back(-1)" class="goback" /></p>';
            }
        } else {
            echo '<p>You need to fill in all required fields!!</p><p><input type="button" value="Go Back" onclick="history.back(-1)" class="goback" /></p>';
        }
    }
?>