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[JMAP] Re: [Jmap] Allow clients to specify an id for new calendars

Bron Gondwana <brong@fastmailteam.com> Wed, 17 September 2025 20:14 UTC

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Date: Wed, 17 Sep 2025 16:14:17 -0400
From: Bron Gondwana <brong@fastmailteam.com>
To: Neil Jenkins <neilj=40fastmailteam.com@dmarc.ietf.org>, Ben Bucksch <ben.bucksch@beonex.com>, Lisa Dusseault <lisa.dusseault@gmail.com>, Mauro De Gennaro <mauro@stalw.art>
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Subject: [JMAP] Re: [Jmap] Allow clients to specify an id for new calendars
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On Tue, Sep 16, 2025, at 19:57, Neil Jenkins wrote:
> I'm very confused about what's being requested here. Everything already has a unique id. It's assigned by the server. The original request was about syncing from another server to your JMAP server, and therefore wanting to store the remote id of the item so you know what you're syncing with. As Mauro said, you could do this with a metadata extension. What am I missing?

Yeah, there seem to be two conflicting requirements here:

1) that every item has a unique identifier
2) that (every?) client can specify the unique identifier that an object has

Those two conflict as soon as two different clients decide to give the same unique identifier to different objects.  What happens there?  This is solved by JMAP by having the server decide the identifier, so it can do the conflict resolution.

(and yes, this really can happen with something like contacts or calendar events if two disconnected clients change them in different ways and then try to save them to the same JMAP account)

Bron.

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  Bron Gondwana, CEO, Fastmail Pty Ltd / Fastmail US LLC
  brong@fastmailteam.com

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