Emark's DOMAIN is not working correctly with naked domains (no www)

[amureki]

Depending on if we are using naked or non-naked domain, the following piece acts differently:

emark/emark/message.py

Lines 119 to 121 in a844123

	top_level_domain = ".".join(site_url.split(".")[-2:])
	if not redirect_url_parts.netloc.endswith(top_level_domain):
	return redirect_url

So, when I have www.example.com as EMARK["DOMAIN"], top_level_domain is example.com

However, when I use example.com as EMARK["DOMAIN"], top_level_domain becomes https://example.com

That means, the tracking logic is always ignored, as redirect_url_parts.netloc.endswith(top_level_domain) is always False

[amureki]

It might be a good idea to introduce a dedicated library that handles all variety of domains, for example:
https://github.com/john-kurkowski/tldextract/

[codingjoe]

It might be a good idea to introduce a dedicated library that handles all variety of domains, for example:
https://github.com/john-kurkowski/tldextract/

Hm... might be risky to introduce a dependency with potential vulnerabilities, for that can be solved in a single regular expression.