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recaptcha-v2-invisible.php in reCAPTCHA 7.2

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recaptcha-php/examples/recaptcha-v2-invisible.php
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<?php

/**
 * @copyright Copyright (c) 2015, Google Inc.
 * @link      https://www.google.com/recaptcha
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
require __DIR__ . '/appengine-https.php';

// Initiate the autoloader. The file should be generated by Composer.
// You will provide your own autoloader or require the files directly if you did
// not install via Composer.
require_once __DIR__ . '/../vendor/autoload.php';

// Register API keys at https://www.google.com/recaptcha/admin
$siteKey = '';
$secret = '';

// Copy the config.php.dist file to config.php and update it with your keys to run the examples
if ($siteKey == '' && is_readable(__DIR__ . '/config.php')) {
  $config = (include __DIR__ . '/config.php');
  $siteKey = $config['v2-invisible']['site'];
  $secret = $config['v2-invisible']['secret'];
}

// reCAPTCHA supports 40+ languages listed here: https://developers.google.com/recaptcha/docs/language
$lang = 'en';
?>
<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,height=device-height,minimum-scale=1">
<link rel="shortcut icon" href="https://www.gstatic.com/recaptcha/admin/favicon.ico" type="image/x-icon"/>
<link rel="canonical" href="https://recaptcha-demo.appspot.com/recaptcha-v2-invisible.php">
<script type="application/ld+json">{ "@context": "http://schema.org", "@type": "WebSite", "name": "reCAPTCHA demo - Invisible", "url": "https://recaptcha-demo.appspot.com/recaptcha-v2-invisible.php" }</script>
<meta name="description" content="reCAPTCHA demo - Invisible" />
<meta property="og:url" content="https://recaptcha-demo.appspot.com/recaptcha-v2-invisible.php" />
<meta property="og:type" content="website" />
<meta property="og:title" content="reCAPTCHA demo - Invisible" />
<meta property="og:description" content="reCAPTCHA demo - Invisible" />
<link rel="stylesheet" type="text/css" href="/examples.css">
<title>reCAPTCHA demo - Invisible</title>

<header>
    <h1>reCAPTCHA demo</h1><h2>Invisible</h2>
    <p><a href="/">↤ Home</a></p>
</header>
<main>
<?php

if ($siteKey === '' || $secret === '') {
  ?>
    <h2>Add your keys</h2>
    <p>If you do not have keys already then visit <kbd> <a href = "https://www.google.com/recaptcha/admin">https://www.google.com/recaptcha/admin</a></kbd> to generate them. Edit this file and set the respective keys in <kbd>$siteKey</kbd> and <kbd>$secret</kbd>. Reload the page after this.</p>
    <?php

}
elseif (isset($_POST['g-recaptcha-response'])) {

  // The POST data here is unfiltered because this is an example.
  // In production, *always* sanitise and validate your input'
  ?>
        <h2><kbd>POST</kbd> data</h2>
        <kbd><pre><?php

  var_export($_POST);
  ?></pre></kbd>
        <?php


  // If the form submission includes the "g-captcha-response" field
  // Create an instance of the service using your secret
  $recaptcha = new \ReCaptcha\ReCaptcha($secret);

  // If file_get_contents() is locked down on your PHP installation to disallow
  // its use with URLs, then you can use the alternative request method instead.
  // This makes use of fsockopen() instead.
  //  $recaptcha = new \ReCaptcha\ReCaptcha($secret, new \ReCaptcha\RequestMethod\SocketPost());
  // Make the call to verify the response and also pass the user's IP address
  $resp = $recaptcha
    ->setExpectedHostname($_SERVER['SERVER_NAME'])
    ->verify($_POST['g-recaptcha-response'], $_SERVER['REMOTE_ADDR']);
  if ($resp
    ->isSuccess()) {

    // If the response is a success, that's it!
    ?>
        <h2>Success!</h2>
        <kbd><pre><?php

    var_export($resp);
    ?></pre></kbd>
        <p>That's it. Everything is working. Go integrate this into your real project.</p>
        <p><a href="/recaptcha-v2-invisible.php">⟳ Try again</a></p>
        <?php

  }
  else {

    // If it's not successful, then one or more error codes will be returned.
    ?>
        <h2>Something went wrong</h2>
        <kbd><pre><?php

    var_export($resp);
    ?></pre></kbd>
        <p>Check the error code reference at <kbd><a href="https://developers.google.com/recaptcha/docs/verify#error-code-reference">https://developers.google.com/recaptcha/docs/verify#error-code-reference</a></kbd>.
        <p><strong>Note:</strong> Error code <kbd>missing-input-response</kbd> may mean the user just didn't complete the reCAPTCHA.</p>
        <p><a href="/recaptcha-v2-invisible.php">⟳ Try again</a></p>
        <?php

  }
}
else {

  // Add the g-recaptcha tag to the form you want to include the reCAPTCHA element
  ?>
    <p>Submit the form and reCAPTCHA will run automatically.</p>
    <form action="/recaptcha-v2-invisible.php" method="post" id="demo-form">
        <fieldset>
            <legend>An example form</legend>
            <label class="form-field">Example input A: <input type="text" name="ex-a" value="foo"></label>
            <label class="form-field">Example input B: <input type="text" name="ex-b" value="bar"></label>
            <button class="g-recaptcha form-field" data-sitekey="<?php

  echo $siteKey;
  ?>" data-callback='onSubmit'>Submit ↦</button>
        </fieldset>
    </form>
    <script type="text/javascript" src="https://www.google.com/recaptcha/api.js?hl=<?php

  echo $lang;
  ?>" async defer></script>
    <script type="text/javascript">
        function onSubmit(token) {
            document.getElementById("demo-form").submit();
        }
    </script>
    <?php

}
?>
</main>

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