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MSC3026: "busy" presence state #3026

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MSC3026: "busy" presence state
babolivier Feb 23, 2021
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babolivier Feb 23, 2021
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Mention MSC number in the unstable prefix
babolivier Mar 12, 2021
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Merge branch 'babolivier/msc_presence_busy' of github.com:matrix-org/…
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29 changes: 18 additions & 11 deletions proposals/3026-presence-busy.md
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# `busy` presence state
# MSC3026: `busy` presence state

The current specification for presence in Matrix describes three states:

Expand All @@ -22,17 +22,24 @@ and active but not available.
It is left to the implementation to decide how to update a user's presence to
the `busy` state (and from this state to another); suggestions would include
allowing the user to set it manually, setting it automatically when the user
joins a call or a Jitsi group call, etc.. It is strongly recommended for
joins a call or a Jitsi group call, etc..

If a user's presence is set to `busy`, it is strongly recommended for
implementations to not implement a timer that would trigger an update to the
`unavailable` state (like most implementations do when the user is in the
`online` state), as there are some valid use cases for the user not triggering
any event in the client but still being online and active, e.g. if they're on a
call.
`online` state). This is because there are some valid use cases for the user not
triggering any event in the client but still being online and active, e.g. if
they're on a call, and because such automation while taking the specific
semantics of the `busy` state into account is complex when the user is using
multiple devices.

For backwards compatibility, if a client fails to update a user's presence state
to `busy` because the homeserver doesn't implement this MSC (which would likely
translate into a `400 Bad Request` response), it should set the user's presence
to `unavailable`, which is the closest state semantically.
For backwards compatibility, servers implementing this MSC must expose a flag in
`/_matrix/client/versions` responses, under `unstable_features`, named
`org.matrix.msc3026.busy_presence`, which is set to `true`. Before setting a
user's presence to `busy`, clients must check the presence of this flag and that
it's set to `true`. If it's not, clients should fall back to setting the user's
presence state to `unavailable`, which is the closest state to `busy`
semantically.
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This sort of backwards compatibility would go in the unstable prefix section - clients (now) can use spec versions to detect support otherwise.



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The spec says that the server aggregates presence data across devices, which I assume means that, e.g. if a user has one device that's online and another that's offline, then the user is marked as online. How does busy fit into this? If a user has a device that's online, and one that's busy, what m.presence event should be sent to others? I think that my expectation would be that busy would take precedence over online.

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I'm pretty sure it does in the current implementation. There seems to be one api end point for presence that was overlooked so we disabled it on our forks but when the online state comes through a sync it is ignored by synapse - matrix-org/synapse#12213

## Potential issues
Expand All @@ -45,5 +52,5 @@ and open to discussion.
## Unstable prefix

Until this proposal is merged into a stable version of the Matrix specification,
implementations must use `org.matrix.msc3026.busy` instead of `busy` as the new presence
state.
implementations must use `org.matrix.msc3026.busy` instead of `busy` as the new
presence state.