List of subdomains that could be candidates for reservation in multitenant app/ subdomain validator for multitenant apps

This is a simple list of subdomains in YAML (I picked YAML over JSON because you can easily add comments).

Subdomains are added as a simple list (ex. www, smtp, etc.). Regular expressions are supported but MUST be quoted and delimited by slashes (ex. "/www[0-9]+/").

Subdomain validator for multitenant apps written in PHP. Simply checks if a subdomain is in the list.

composer require nkkollaw/reserved-subdomains

Bool \nkkollaw\Multitenancy\Validators\Subdomain::isReserved($subdomain[, $yaml_file]);

Example:

$subdomain = 'www2';
if (\nkkollaw\Multitenancy\Validators\Subdomain::isReserved($subdomain)) {
    throw new Exception('Sorry, subdomain is reserved');
}

Pull requests are welcome.

It would be nice to implement a validator in different languages (Node, Ruby? PHP is in /php)

The following *nix commands might be useful while editing the list:

cat reserved-subdomains.yaml | sort # sort entries

awk '{if (++dup[$0] == 1) print $0;}' reserved-subdomains.yaml # remove duplicates

awk '{if (++dup[$0] == 1) print $0;}' reserved-subdomains.yaml | sort # remove duplicates + sort