URI features: naked_domain and subdomain

[Dmitry Rubinstein]

Hello!

I want to propose some new features in URI module.

First one is naked domain, which works something like this

assert "http://foo.bar.baz.com" |> URI.parse |> Map.get(:naked_domain) == "baz.com"

or

assert "http://foo.bar.baz.com" |> URI.naked_domain == "baz.com"

And subdomain method:

assert "http://foo.bar.baz.com" |> URI.subdomain("baz.com") == "foo.bar"

assert "http://foo.bar.baz.com" |> URI.subdomain("bar.baz.com") == "foo"

May be it can be relevant.

[José Valim]

This can be trivially implemented with the existing functionality, so I would recommend defining it in your own apps.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

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[Dmitry Rubinstein]

Ok, thank you.

On Sun, 26 Mar 2017 at 12:46 José Valim <jose....@plataformatec.com.br> wrote:

This can be trivially implemented with the existing functionality, so I would recommend defining it in your own apps.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

On Sun, Mar 26, 2017 at 11:39 AM, Dmitry Rubinstein <rubins...@gmail.com> wrote:

Hello!

I want to propose some new features in URI module.

First one is naked domain, which works something like this

assert "http://foo.bar.baz.com" |> URI.parse |> Map.get(:naked_domain) == "baz.com"

or

assert "http://foo.bar.baz.com" |> URI.naked_domain == "baz.com"

And subdomain method:

assert "http://foo.bar.baz.com" |> URI.subdomain("baz.com") == "foo.bar"

assert "http://foo.bar.baz.com" |> URI.subdomain("bar.baz.com") == "foo"

May be it can be relevant.

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[Myron Marston]

It's not quite clear to me what you mean by "naked domain".  If it's just the last two parts of the fully qualified domain name in the given URI, then yes, it's trivial enough to write a function to get that yourself.  However, many applications are concerned with what the registrable domain is.  For example, from `foo.bar.baz.com` it's `baz.com` but from  `foo.bar.baz.co.uk` it's `baz.co.uk` (the last 3 parts, in this case!).  There's no algorithm for doing this correctly, but mozilla maintains the public suffix list that can be used for this purpose:

https://publicsuffix.org/

We wrote an Elixir library that operates on these rules which you might find useful:

https://github.com/seomoz/publicsuffix-elixir

Myron

[Dmitry Rubinstein]

Yes, thank you.
I know that task is not so trivial, TLD is not so easy problem.
That's why I thought that this functionality probably should be added to the core.
But I watched another languages and solutions and released that because of this list is changing over time - the best solution is to use side library

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