CODEWITHSUNDEEP
phpinvisible-recaptcharecaptcha-v3
Burndog
Burndog

Reputation: 719

How to solve Google v3 reCaptcha timeout?

We have a PHP form that is several tabs and times-out on the reCaptcha. Everything is done in one page and it works perfectly fine IF the form is completed in <3 minutes.

The idea of a solution is to move the form processing and reCaptcha to a secondary page for processing.

The problem is that the form page polls the google service for reCaptcha and collects a token value to a hidden field.

<input type="hidden" name="recaptcha_response" id="recaptchaResponse">

The problem is how to request this token on the server side processing page? Here is the code used on the client side form page. I need to somehow regenerate the token value to apply as :

$recaptcha_response

Here is the working version on the form page. It's easy to remove the requirement on Posting the token from the form page, just not sure how to regenerate the token to use on the server side page.

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['recaptcha_response'])) {

// Build POST request:
$recaptcha_url = 'https://www.google.com/recaptcha/api/siteverify';
$recaptcha_secret = RECAPTCHA_SECRET_KEY;
$recaptcha_response = $_POST['recaptcha_response'];
$remoteip = $_SERVER['REMOTE_ADDR'];

// Make and decode POST request:
$recaptcha = file_get_contents($recaptcha_url . '?secret=' . $recaptcha_secret . '&response=' . $recaptcha_response. '&remoteip='.$remoteip);
$recaptcha = json_decode($recaptcha);

// Take action based on the score returned:
if ($recaptcha->score >= 0.5) {

EDIT TO ADD: Would making the initialization of the reCaptcha until Submit delay the timing issue since this seems to be an option:

https://developers.google.com/recaptcha/docs/v3

"2. Call grecaptcha.execute on an action or when the page loads"

Upvotes: 14

Views: 42287

Answers (6)

Mike Poole
Mike Poole

Reputation: 2055

If you do not wish to change your code too much then an alternative approach would be to wrap the reCaptcha JavaScript in a named function, set up an interval and poll that function prompting reCaptcha to add a new token to your form element 10 seconds before each two minute token expiry:

function getReCaptcha(){
    grecaptcha.ready(function() {
       ...
     });
 }

 getReCaptcha();  // This is the initial call
 setInterval(function(){getReCaptcha();}, 110000);

Upvotes: 25

nurmat
nurmat

Reputation: 481

When you use grecaptcha.execute(), it does not resolve an issue. Because execute() can also throw an error. To solve this issue you should put execute inside try-catch block. For example:

grecaptcha.ready(function() {
    try {
      grecaptcha.execute('RECAPTCHA_SITE_KEY', {action: 'submit'})
        .then(function(token) {
            submitYourForm(token);
        })
    } catch (error) {
        yourRetryBlockHere();
    }
});

Upvotes: 0

pablosd
pablosd

Reputation: 352

Ignore everything else here. Reasons:

  1. If you just generate the token on page load, it's going to time out after 2 minutes, which means users will not be happy about it
  2. Refreshing tokens will cost you (there's free tier but it costs after using X requests)

Solution: Generate the token at the time of form submission! https://jsfiddle.net/skobaljic/rL6fux5w/2/

var webQueryForm = $('#webQuery');
webQueryForm.submit(function(event) {
  e.preventDefault();
  grecaptcha.execute('MYSITEKEY(PUBLIC)', {
     action: 'contact'
     }).then(function(token) {
     $('#recaptchaToken').val(token);
    webQueryForm.submit();
  });
});

Upvotes: 0

Saklayen Ahmed
Saklayen Ahmed

Reputation: 13

Load reCaptcha API js and Jquery (if you use jquery code):

<script src="https://www.google.com/recaptcha/api.js?render=SITE_KEY"></script>
<script  src="https://code.jquery.com/jquery-3.4.1.min.js"></script>

reCaptcha Render Javascript:

  <script type="text/javascript">
     $(document).ready(function(){
        setInterval(function(){
        grecaptcha.ready(function() {
            grecaptcha.execute('SITE_KEY', {action: 'home'}).then(function(token) {
                $('#recaptchaResponse').val(token);
            });
        });
        }, 3000); //you can set timeout for expired.
     });
     
  </script>

Site Varify:

<?php 
    if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['submit'])) {
        if(isset($_POST['recaptcha_response']) && !empty($_POST['recaptcha_response'])){
            $recaptcha_url = 'https://www.google.com/recaptcha/api/siteverify';
            $recaptcha_secret = 'SECRET_KEY';
            $recaptcha_response = $_POST['recaptcha_response'];
            $response = file_get_contents($recaptcha_url . '?secret=' . $recaptcha_secret . '&response=' . $recaptcha_response);
            $recaptcha = json_decode($response);
            if ($recaptcha->success == true && $recaptcha->score >= 0.5) {
                echo $response;
                echo '<br>Form Submitted Successfully';
            } else { 
                echo $response;
                echo '<br>reCaptcha varification failed';
            }
        }else {
            echo 'reCaptcha is empty';
        } 
    }
?>

HTML Form:

<form method="POST">
    <label class="label">Name</label>
    <input type="text" name="name" class="input" placeholder="Name" required>
    <button type="submit" name="submit" class="button is-link">Send Message</button>
    <input type="hidden" name="recaptcha_response" id="recaptchaResponse">
</form>

Upvotes: 1

ahwm
ahwm

Reputation: 692

We've been running into this recently, too. I found this solution on GitHub and it's been working well for us.

This has the benefit of only asking for a token when the user interacts with the page (such as submitting a form) instead of having to keep asking for one.

<script>
  grecaptcha.ready(function() {
      document.getElementById('contactform').addEventListener("submit", function(event) {

        event.preventDefault();

        grecaptcha.execute('mykey', {action: 'homepage'}).then(function(token) {
           document.getElementById("googletoken").value = token; 
           document.getElementById('contactform').submit();
        });        
      }, false);

  });
</script>

Upvotes: 12

PHP Kishan
PHP Kishan

Reputation: 323

<script type="text/javascript">
function grecaptcha_execute(){
    grecaptcha.execute('RECAPTCHA_SITE_KEY', {action: 'homepage'}).then(function(token) {
        document.getElementById('recaptchaResponse').value=token;
    });
}
grecaptcha.ready(function() {
    grecaptcha_execute();
});
</script>

<?php
if ($recaptcha->success) {
    echo '<p style="color: #0a860a;">CAPTCHA was completed successfully!</p>';
}else{
    $error_codes = 'error-codes';
    if (isset($Retorno->$error_codes) && in_array("timeout-or-duplicate", $Retorno->$error_codes)) {
        $captcha_msg = "The verification expired due to timeout, please try again.";
    ?>
    <script>grecaptcha_execute();</script>
    <?php
    } else {
        $captcha_msg = "Check to make sure your keys match the registered domain and are in the correct locations.<br> You may also want to doublecheck your code for typos or syntax errors.";
    }
    echo '<p style="color: #f80808;">reCAPTCHA error: ' . $captcha_msg . '</p>';
}
?>

Upvotes: 4

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