[Dev] Subscribing to calendar URLs
grant at osafoundation.org
Wed Feb 1 14:33:16 PST 2006
On Feb 1, 2006, at 14:18, Morgen Sagen wrote:
>> On IRC earlier today, we had a user, Leppy, unable to subscribe to
>> his Basecamp calendars (see <http://basecamphq.com/>) from
>> Chandler; both Mozilla and Apple iCal both had no problems.
>> What's going on here is that Chandler is getting itself confused
>> about what kind of thing you're trying to subscribe to. It could
>> be any of:
>> 1. A simple text/calendar resource (i.e. a ".ics file on the web").
>> 2. A non-CalDAV Chandler WebDAV collection (i.e. cloud xml)
>> 3. A CalDAV collection
> I'm for using the webcal scheme for detecting case #1; either that
> or adding a checkbox to the subscribe dialog that lets the user
> indicate which case it is. It gets tough to auto-detect between #1
> and #3 because Cosmo will actually return a monolithic .ics
> calendar if you do a GET on a CalDAV collection (which is actually
> a cool feature, it just makes it hard to auto-detect things).
Right. It's not so tough, though, IMHO: What I'm implementing now
(i.e. for 0.7) is to send OPTIONS first:
- If PROPFIND is allowed, we can use standard WebDAV to figure out
whether it's 1, 2 or 3
- If it isn't, we can go ahead and use GET. I'd say that if GET shows
a Content-Type that isn't text/calendar, we go ahead and try to parse
it as ICalendar anyway, but report errors differently. (There seem to
exist misconfigured servers out there, including the IRC user's, that
report the Content-Type incorrectly).
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