How to prevent using fake domains for purchasing a hosting plan

[Craft]

How to prevent using fake domains for purchasing a hosting plan?

I need the system to check first if it's an existing domain or not, and if found it's a fake domain then don't accept it.

 

[Kian]

Why? I don't see the reason why you should check it.

If you really want to check it, be prepared because it's boring to do. On submit (when users click Use or press enter) you need to:

1. preventDefault() the standard POST of WHMCS
2. Run DomainWhois API function and read what the Registrar says
3. Optionally run ping & nslookup
4. If the domain exists, re-send the POST you have previously prevented otherwise load a modal to say "Dear visitor you can't use fake domains"
5. Make sure that visitors can't bypass your verification process by simply turning off javascript (server-side validation in ClientAreaPage hook point)

Edited November 28, 2020 by Kian

[brian!]

9 hours ago, Craft said:

How to prevent using fake domains for purchasing a hosting plan?

fake as in the domain literally doesn't exist, or in the sense that it's not my domain ?

9 hours ago, Craft said:

I need the system to check first if it's an existing domain or not, and if found it's a fake domain then don't accept it.

a quick way would be to use checkdnsrr, but it would not be 100% definitive (though I suspect no solution you could find would be 100% accurate)...

<?php

add_hook('ShoppingCartValidateDomain', 1, function($vars) {
	$domain = $vars['sld'].$vars['tld'];
	if($vars['domainoption'] == "owndomain" && !checkdnsrr($domain,"ANY")) {
		return 'The domain of '.$domain.' does not appear to be valid.';
	}
});

so it's going to stop customers using "sgdfgdfgdfgdfg.com", but not "whmcs.com".

the hook could use language overrides in the return strings if the output needs to be in the users language, and can also be tweaked to be applicable to only certain products (and not all products as currently coded).

 

[Craft]

Thanks @brian!