Hostname type about ip4s HOT 4 CLOSED

Sounds good to me. We can add a Hostname type to the core library and implement the RFC validation. Maybe another type that represents an Either[Hostname, IpAddress] with to/from string methods?

I'm on board with a submodule for cats and another for scalaz if there's interest. We could define Eq/Order/Show instances then too.

from ip4s.

I was looking in to implementing this and ran in to a small issue. We can easily add a Hostname type that checks RFC1123 compliance however, it is probably useful to also have a hostname type that supports internationalized domain names. RFC 3492 defines the conversion from an internationalized domain name to an RFC1123 domain name but that's a fairly large specification to implement. On the JVM, an implementation is provided by java.net.IDN but this class hasn't been ported to Scala.js.

Some options in increasing amount of work:

• don't support internationalized domain names
• only support internationalized domain names on the JVM
• link to an existing JS library for an RFC 3492 implementation on JS, link to java.net.IDN on JVM
• build a pure Scala implementation of RFC 3492

from ip4s.

Could also add port IDN to scala-js (cleanroom Scala implementation) and then use that.

from ip4s.

Fixed via addition of Hostname and IDN types.

from ip4s.