[jdev] JEP-0106 - Jid Escaping

[Hernan Tylim]

Peter Saint-Andre wrote:
[...]
>>But what 
>>if we need to escape a character that is not allowed by STRINGPREP ?
> 
> What character? The stringprep profiles used by XMPP are pretty liberal
> in the characters they allow.


Well, I don´t really know. I didn´t read carefully the STRINGPREP rfc so 
I just assumed that it might exist some character allowed on some IM 
network which might not be allowed by STRINGPREP.


[...]
>>and given that Sametime usernames are case sensitive I needed to 
>>escape also all uppercase letters. 
> 
> Ick. 


And thats not all. For example my sametime server reports my username as 
  "CN=Hernán Tylim/O=Novamens". Imagine now how it looks when escaped...

I implemented jabber:iq:gateway so I hope that an end user will never 
need to enter (or see) one of these jids.


>>Does JEP-106 cover this case ? If not, why not ?
> 
> Not yet, probably because we didn't think about the need to handle
> foreign addresses that are case-sensitive for US-ASCII characters.
> Obviously the intent of JEP-0106 was to handle characters that are not
> allowed by nodeprep, not to provide a mechanism for getting around the
> nodeprep/stringprep rules themselves.
> 
> It seems that we may need to work on this some more. One possibility 
> is to change MUST NOT to SHOULD NOT regarding which characters can be
> transformed using JEP-0106, but I am not sure that's a good idea.
> Further thought required....


I hope that this new scenario will serve then as food for thought. In 
the meanwhile I am using the URL escape mechanism but I would really 
prefer to use a recognized JEP.

Thanks for the feedback!


Regards,
Hernán