With this source code one can only access a website if the recaptcha (v3) was successful. This is a simple way to stop crawlers from accessing your website.
When a user accesses a page on your website one is automatically redirected to the verify.html
www.yourwebsite.com/siteabc --> www.yourwebsite.com/verify/verify.html
On that site the user clicks a button to verify that one is human. If the recaptcha is successful the user is redirected to the original page. The successful verification is then saved in the browser so the user doesn't need to verify everytime.
www.yourwebsite.com/verify/verify.html --> www.yourwebsite.com/siteabc
To make this work, fill in the following tokens: verify.html l.17
grecaptcha.execute('YOUR RECAPTCHA KEY', {action:'Submit'})
verify.php l.12
$secret = 'YOUR SECRET RECAPTCHA KEY';
And for your domainname: encrypt.php l.4-6 (this file is only for generation of a encrypted domain)
$domain = "YOURDOMAIN";
$encryption_key = "SOME RANDOM KEY";
$encryption_iv = "SOME RANDOM INITALIZATION VECTOR";
verify.php l.10-12
$encrypteddomain = "YOUR ENCRPYTED DOMAIN";
$encryption_key = "KEY FROM 'encrypt.php'";
$encryption_iv = "INITALIZATION VECTOR FROM 'encrypt.php'";