[Remind-Fans] remind/radicale & Thunderbird

[Jochen Sprickerhof]

Hi Saša,

* Saša Janiška via Remind-fans <remind-fans at lists.skoll.ca> [2022-07-15 16:57]:
>> Interesting, it does not work for me either. Seems like Thunderbird 
>> wants to send the whole collection
>
>> on every update and radicale-remind does not support creating new 
>> collections.

I've tested old Thunderbird and found that version 78.14.0 has an option 
to select iCalendar (ICS) or CalDAV when adding a calendar. Choosing 
CalDAV makes it kind of work. It complains a bit about not being able to 
save something but it sends single events and changes are saved. Whereas 
choosing iCalendar shows the same behavior as later versions. Then I 
looked through the configuration files and found that there is a type 
key in calendar.registry which is set to ics by default. Setting it to 
caldav makes it work. To change it do:

Open Tools > Options > Advanced tab, and click Config Editor button.
In the “Filter:” box enter “calendar.registry”
Find a .type key and change it from ics to caldav.

Maybe someone should open a bug report with Thunderbird to bring the 
option back ;).

>Is it hard to implement that feature?

For reference I also looked into this:

To my understanding the iCalendar option works more like a file with all 
events, so every change needs a resync of the complete file. This 
triggers the create collection function in Radicale and the 
documentation says that the collection should be replaced if it exists 
already. I did a naive implementation where I ignore the collection 
creation which should be fine as long as there are no changes to it in 
Thunderbird. But Thunderbird still complains that it was not able to 
save data even though there where no changes. Then I compared the 
initial collection from Radicale with the one Thunderbird send and they 
are quiet different. Thunderbird drops the timezone information, changes 
the DTSTAMP (time stamp of last update) and adds extra flags, like 
X-MOZ-GENERATION. I guess Thunderbird expects the send file to be saved 
bit identical (like a WebDAV client) which is not possible with 
Radicale. I guess you could implement a proxy that stores the 
Thunderbird file and feeds changes back to Radicale (and the other way 
round). But that is out of scope of radicale-remind (and Radicale) and 
would be a new project.

Cheers Jochen
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://dianne.skoll.ca/pipermail/remind-fans/attachments/20220715/c1ae36bf/attachment.sig>