[Kolab-devel] CalDAV Collections vs. IMAP Folders

[Jeroen van Meeuwen]

On Thursday, March 28, 2013 05:52:30 PM Georg C. F. Greve wrote:
> On 2013-03-28 17:23, Thomas Brüderli wrote:
> > But let's wait for a final word from our system architect before we
> > nail this down in a KEP.
> 
> Indeed. He'll be back next week - plus we'll all be in Berne together,
> I am sure we'll work out the details.
> 

So, if I understand correctly:

- *DAV clients expect to be able to refer to any given collection (=> 
Calendar) by UID (=> /shared/vendor/kolab/dav-uid).

  This applies to CardDAV as well, I suppose?

- As the DAV client creates the collection, supposedly it uses either 
DAV:displayname in the MKCALENDAR command, or issues a PROPPATCH to change the 
DAV:displayname property;

- First creating a event.default sub-folder with the UID as the base name, to 
then rename that folder to match the desired DAV:displayname does not seem an 
unreasonable scenario to me (or, of course, keep the entire transaction 
pending and create the IMAP folder only after the desired DAV:displayname has 
been received). I suppose for existing calendars the IMAP folder base name can 
be used as the initial DAV:displayname property to a collection resource, 
until the user decides to set it to anything else.

- A client changing the display name of a calendar (collection resource) would 
then basically have two options: 1) Rename the IMAP folder (from 
Calendar/Personal to Calendar/Personal Calendar, possibly repositioning the 
folder in the IMAP folder hierarchy?), or 2) set a different 
/vendor/kolab/displayname metadata value.

There's ambiguity in there, I don't think can be simply addressed by stating 
the usual MUSTs and SHOULDs in a KEP. I think perhaps it is best to use the 
IMAP folder base name ("Personal" for "Calendar/Personal"), and have the IMAP 
folder be renamed upon a change of this "title" (for admins). I would then 
suggest the use of a /vendor/kolab/displayname metadata entry as an 
internationalization feature (I say 日历, you say Kalender), which happens to 
serve the DAV:displayname as well (IMAP folder rename for admins, 
/private/vendor/kolab/displayname for mortals).

A "description" for a CalDAV calendar collection resource could indeed go to 
/comment.

The CalDAV UID required could indeed go to /vendor/kolab/dav-uid (/shared 
only, I reckon).

Kind regards,

Jeroen van Meeuwen

-- 
Systems Architect, Kolab Systems AG

e: vanmeeuwen at kolabsys.com
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