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Filename : recaptcha-v2-checkbox-explicit.php
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<?php
/**
 * BSD 3-Clause License
 * @copyright (c) 2019, Google Inc.
 * @link https://www.google.com/recaptcha
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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 'ReCaptcha/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-standard']['site'];
    $secret = $config['v2-standard']['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-checkbox-explicit.php">
<script type="application/ld+json">{ "@context": "http://schema.org", "@type": "WebSite", "name": "reCAPTCHA demo - \"I'm not a robot\" checkbox - Explicit render", "url": "https://recaptcha-demo.appspot.com/recaptcha-v2-checkbox-explicit.php" }</script>
<meta name="description" content="reCAPTCHA demo - &quot;I'm not a robot&quot; checkbox - Explicit render" />
<meta property="og:url" content="https://recaptcha-demo.appspot.com/recaptcha-v2-checkbox-explicit.php" />
<meta property="og:type" content="website" />
<meta property="og:title" content="reCAPTCHA demo - &quot;I'm not a robot&quot; checkbox - Explicit render" />
<meta property="og:description" content="reCAPTCHA demo - &quot;I'm not a robot&quot; checkbox - Explicit render" />
<link rel="stylesheet" type="text/css" href="/examples.css">
<title>reCAPTCHA demo - "I'm not a robot" checkbox - Explicit render</title>

<header>
    <h1>reCAPTCHA demo</h1><h2>"I'm not a robot" checkbox - Explicit render</h2>
    <p><a href="/">↩️ Home</a></p>
</header>
<main>
<?php
if ($siteKey === '' || $secret === ''):
?>
    <h2>Add your keys</h2>
    <p>If you do not have keys already then visit <kbd> <a href = "https://www.google.com/recaptcha/admin">https://www.google.com/recaptcha/admin</a></kbd> to generate them. Edit this file and set the respective keys in the <kbd>config.php</kbd> file or directly to <kbd>$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-checkbox-explicit.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-checkbox-explicit.php">⤴️ Try again</a></p>
        <?php
    endif;
else:
    // Add the g-recaptcha tag to the form you want to include the reCAPTCHA element
    ?>
    <p>Complete the reCAPTCHA then submit the form.</p>
    <form action="/recaptcha-v2-checkbox-explicit.php" method="post">
        <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>
            <!-- Set up a container to render the widget -->
            <div class="g-recaptcha form-field"></div>
            <!-- Disable the button by default, will enable when the widget loads -->
            <button class="form-field" type="submit" disabled>Submit ↦</button>
        </fieldset>
    </form>
    <script type="text/javascript">
    var onloadCallback = function() {
        var captchaContainer = document.querySelector('.g-recaptcha');
        grecaptcha.render(captchaContainer, {
          'sitekey' : '<?php echo $siteKey; ?>'
        });
        document.querySelector('button[type="submit"]').disabled = false;
    };
    </script>
    <script type="text/javascript" src="https://www.google.com/recaptcha/api.js?hl=<?php echo $lang; ?>&onload=onloadCallback&render=explicit" async defer></script>
    <?php
endif;?>
</main>

<!-- Google Analytics - just ignore this -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-123057962-1"></script>
<script>window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-123057962-1');</script>