[Feature Request] Internationalized domain name (IDN) support

[PeterDaveHello]

Hello,

I just found this useful python tool, it looks great in most cases! Not sure is IDN support will be something you'd also like to have, it'll be awesome if it's also supported.

Currently, IDN will be considered as an invalid FQDN:

$ python
Python 3.6.9 (default, Jul 17 2020, 12:50:27) 
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from fqdn import FQDN
>>> FQDN('Bücher.example').is_valid
False

Thank you!

[ypcrts]

Yes I do want IDN support, but without breaking old use cases. I’ll see what Santa is bringing this year.

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On Tue, Nov 17, 2020 at 09:17, Peter Dave Hello notifications@github.com wrote:

Hello,

I just found this useful python tool, it looks great in most cases! Not sure is IDN support will be something you'd also like to have, it'll be awesome if it's also supported.

Currently, IDN will be considered as an invalid FQDN:

$ python Python 3.6.9 (default, Jul 17 2020, 12:50:27) [GCC 8.4.0] on linux Type "help", "copyright", "credits" or "license" for more information.

from fqdn import FQDN FQDN('Bücher.example').is_valid False

Thank you!

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[PeterDaveHello]

Thank you @ypcrts 😃

[ypcrts]

@PeterDaveHello

What is your use case for this? You want FQDN('Bücher.example').is_valid to return True. What do you want for the internal state? For example, do you want FQDN('Bücher.example').relative to return xn--bcher-kva.example or Bücher.example? Why?

Really, what I'm asking is, how is your use case different from #12 ?

[PeterDaveHello]

To me personally I prefer .relative() to return xn--bcher-kva.example, because it's more comparable, one of the issues of IDN is the identifyability by human eyes, but I may need to dig more about how IDN is saved in the most popular DNS service providers.

[PeterDaveHello]

I'm not pretty sure but this may just be duplicated with #12

[PeterDaveHello]

cc @ross & https://github.com/octodns/octodns/issues/199, octodns may be able to support IDN via the implementation here(and may also contribute back), I've already use this fqdn package in octodns to help fdqn validation (https://github.com/octodns/octodns/pull/631)!