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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';
// This example shows the use of a Content Security Policy
// https://developers.google.com/web/fundamentals/security/csp/
// First we generate a pseudorandom nonce for each included or inline script
$nonce = base64_encode(openssl_random_pseudo_bytes(16));
// Send the CSP header
// Try commenting out the various lines to see what effect it has
// NOTE: Always test your policy Content-Security-Policy-Report-Only first to
// ensure you're not blocking any critical functionality. CSP is an important
// security feature but you can break entire sections of your site if you
// implement it incorrectly.
header(
"Content-Security-Policy: "
."default-src 'none'; " // By default we will deny everything
."script-src 'nonce-".$nonce."'; " // nonce allowing the reCAPTCHA library and other third-party scripts to be included
."img-src https://www.gstatic.com/recaptcha/ https://www.google-analytics.com; " // allow images from these URLS
."frame-src https://www.google.com/; " // allow frames from this URL
."style-src 'self'; " // allow style from our own origin
."connect-src 'self'; " // allow the fetch calls to our own origin
);
// 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['v3']['site'];
$secret = $config['v3']['secret'];
}
// reCAPTCHA supports 40+ languages listed here: https://developers.google.com/recaptcha/docs/language
$lang = 'en';
// The v3 API lets you provide some context for the check by specifying an action.
// See: https://developers.google.com/recaptcha/docs/v3
$pageAction = 'examples/csp';
?>
<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,height=device-height,minimum-scale=1">
<link rel="shortcut icon" href="https://www.gstatic.com/recaptcha/admin/favicon.ico" type="image/x-icon"/>
<link rel="canonical" href="https://recaptcha-demo.appspot.com/recaptcha-content-security-policy.php">
<script type="application/ld+json">{ "@context": "http://schema.org", "@type": "WebSite", "name": "reCAPTCHA demo - Content Security Policy", "url": "https://recaptcha-demo.appspot.com/recaptcha-content-security-policy.php" }</script>
<meta name="description" content="reCAPTCHA demo - Content Security Policy" />
<meta property="og:url" content="https://recaptcha-demo.appspot.com/recaptcha-content-security-policy.php" />
<meta property="og:type" content="website" />
<meta property="og:title" content="reCAPTCHA demo - Content Security Policy" />
<meta property="og:description" content="reCAPTCHA demo - Content Security Policy" />
<link rel="stylesheet" type="text/css" href="/examples.css">
<title>reCAPTCHA demo - Content Security Policy</title>
<header>
<h1>reCAPTCHA demo</h1><h2>Content Security Policy</h2>
<p><a href="/">↩️ Home</a></p>
</header>
<main>
<?php
if ($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
else:
?>
<p>This example is sending the <kbd>Content-Security-Policy</kbd> header. Look at the source and inspect the network tab for this request to see what's happening. The reCAPTCHA v3 API is being called here, however you can use the same approach for the v2 API calls as well.</p>
<p><strong>NOTE:</strong>This is a sample implementation, the score returned here is not a reflection on your Google account or type of traffic. In production, refer to the distribution of scores shown in <a href="https://www.google.com/recaptcha/admin" target="_blank">your admin interface</a> and adjust your own threshold accordingly. <strong>Do not raise issues regarding the score you see here.</strong></p>
<ol id="recaptcha-steps">
<li class="step0">reCAPTCHA script loading</li>
<li class="step1 hidden"><kbd>grecaptcha.ready()</kbd> fired, calling <pre>grecaptcha.execute('<?php echo $siteKey; ?>', {action: '<?php echo $pageAction; ?>'})'</pre></li>
<li class="step2 hidden">Received token from reCAPTCHA service, sending to our backend with:
<pre class="token">fetch('/recaptcha-v3-verify.php?token=abc123</pre></li>
<li class="step3 hidden">Received response from our backend: <pre class="response">{"json": "from-backend"}</pre></li>
</ol>
<p><a href="/recaptcha-content-security-policy.php">⤴️ Try again</a></p>
<!-- Add the nonce for our inline script to this tag -->
<script nonce="<?php echo $nonce; ?>">
var onloadCallback = function() {
const steps = document.getElementById('recaptcha-steps');
grecaptcha.ready(function() {
document.querySelector('.step1').classList.remove('hidden');
grecaptcha.execute('<?php echo $siteKey; ?>', {action: '<?php echo $pageAction; ?>'}).then(function(token) {
document.querySelector('.token').innerHTML = 'fetch(\'/recaptcha-v3-verify.php?action=<?php echo $pageAction; ?>&token=\'' + token;
document.querySelector('.step2').classList.remove('hidden');
fetch('/recaptcha-v3-verify.php?action=<?php echo $pageAction; ?>&token='+token).then(function(response) {
response.json().then(function(data) {
document.querySelector('.response').innerHTML = JSON.stringify(data, null, 2);
document.querySelector('.step3').classList.remove('hidden');
});
});
});
});
};
</script>
<!-- Add the nonce value for the reCAPTCHA library to its script tag -->
<script async defer src="https://www.google.com/recaptcha/api.js?render=<?php echo $siteKey; ?>&onload=onloadCallback" nonce="<?php echo $nonce; ?>"></script>
<?php
endif;?>
</main>
<!-- Google Analytics - adding nonces here for the library and the inline code -->
<script async defer src="https://www.googletagmanager.com/gtag/js?id=UA-123057962-1" nonce="<?php echo $nonce; ?>"></script>
<script async nonce="<?php echo $nonce; ?>">window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-123057962-1');</script>