BLUE-BAR Use CALDAV to push new events into my calendar

[chibenwa]

Why ?

-> Retire the TMail / OpenPaaS rabbitMQ connector
-> Also #1573 needs to be synchronous
-> Finally do like CardDavCollected addresses

How ?

Implement a CalDavCollect mailet that post items into the calendar.

[HoussemNasri]

We can inspire our implementation from: https://github.com/linagora/linagora.esn.calendar/blob/master/backend/lib/caldav-client/index.js

[vttranlina]

the TMail / OpenPaaS rabbitMQ connector

Ref: https://github.com/apache/james-project/blob/ca3016254a68cda0a6a04036e0dd25b3961825a4/docs/modules/servers/partials/configure/collecting-events.adoc

[vttranlina]

• Right now we already have a method updateCalendarObject(DavUser user, URI calendarObjectUri, UnaryOperator calendarObjectUpdater), but need to verify does it support idempotency/upsert?

[chibenwa]

but need to verify does it support idempotency/upsert?

It uses If-Match header with the etag property, with a bounded count of retries.

If it don't then it's an issue.

tmail-backend/tmail-backend/tmail-third-party/openpaas/src/main/java/com/linagora/tmail/dav/DavClient.java

Line 187 in 8adcac3

.map(calendar -> new DavCalendarObject(uri, calendar, response.responseHeaders().get("ETag")));

tmail-backend/tmail-backend/tmail-third-party/openpaas/src/main/java/com/linagora/tmail/dav/DavClient.java

Line 158 in 8adcac3

.add(HttpHeaderNames.IF_MATCH, updatedCalendarObject.eTag())

[Arsnael]

Team remark:

• scope: only handling new events or also cancelled events?

[chibenwa]

Ok to handle too cancelled events

Maybe in a follow up issue though, and a clear functional and technical description

We might also look at updates events