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@ -20,7 +20,7 @@ membership of a room.
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A presence list is a list of user IDs whose presence the user wants to follow.
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To be added to this list, the user being added must be invited by the list owner
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who must accept the invitation.
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User's presence state is represented by the ``presence`` key, which is an enum
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of one of the following:
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@ -30,8 +30,6 @@ of one of the following:
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idle.
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- ``offline`` : The user is not connected to an event stream or is
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explicitly suppressing their profile information from being sent.
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- ``free_for_chat`` : The user is generally willing to receive messages
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moreso than default.
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Events
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------
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@ -46,67 +44,44 @@ listed below.
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{{presence_cs_http_api}}
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Idle timeout
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~~~~~~~~~~~~
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Clients SHOULD implement an "idle timeout". This is a timer which fires after
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a period of inactivity on the client. The definition of inactivity varies
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depending on the client. For example, web implementations may determine
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inactivity to be not moving the mouse for a certain period of time. When this
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timer fires it should set the presence state to ``unavailable``. When the user
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becomes active again (e.g. by moving the mouse) the client should set the
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presence state to ``online``. A timeout value between 1 and 5 minutes is
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recommended.
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Server behaviour
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----------------
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Each user's homeserver stores a "presence list" per user. Once a user accepts
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a presence list, both user's HSes must track the subscription.
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Propagating profile information
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Because the profile display name and avatar information are likely to be used in
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many places of a client's display, changes to these fields SHOULD cause an
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automatic propagation event to occur, informing likely-interested parties of the
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new values. One of these change mechanisms SHOULD be via ``m.presence`` events.
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These events should set ``displayname`` and ``avatar_url`` to the new values
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along with the presence-specific keys. This SHOULD be done automatically by the
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homeserver when a user successfully changes their display name or avatar URL.
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.. admonition:: Rationale
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The intention for sending this information in ``m.presence`` is so that any
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"user list" can display the *current* name/presence for a user ID outside the
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scope of a room e.g. for a user page. This is bundled into a single event for
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several reasons. The user's display name can change per room. This
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event provides the "canonical" name for the user. In addition, the name is
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bundled into a single event for the ease of client implementations. If this
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was not done, the client would need to search all rooms for their own
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membership event to pull out the display name.
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Last active ago
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~~~~~~~~~~~~~~~
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The server maintains a timestamp of the last time it saw a
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pro-active event from the user. A pro-active event may be sending a message to a
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room or changing presence state to a higher level of availability. Levels of
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availability are defined from low to high as follows:
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The server maintains a timestamp of the last time it saw a pro-active event from
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the user. A pro-active event may be sending a message to a room or changing
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presence state to ``online``. This timestamp is presented via a key called
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``last_active_ago`` which gives the relative number of milliseconds since the
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pro-active event.
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To reduce the number of presence updates sent to clients the server may include
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a ``currently_active`` boolean field when the presence state is ``online``. When
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true, the server will not send further updates to the last active time until an
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update is sent to the client with either a) ``currently_active`` set to false or
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b) a presence state other than ``online``. During this period clients must
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consider the user to be currently active, irrespective of the last active time.
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The last active time must be up to date whenever the server gives a presence
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event to the client. The ``currently_active`` mechanism should purely be used by
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servers to stop sending continuous presence updates, as opposed to disabling
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last active tracking entirely. Thus clients can fetch up to date last active
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times by explicitly requesting the presence for a given user.
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- ``offline``
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- ``unavailable``
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- ``online``
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- ``free_for_chat``
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Idle timeout
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~~~~~~~~~~~~
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Based on this list, changing state from ``unavailable`` to ``online`` counts as
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a pro-active event, whereas ``online`` to ``unavailable`` does not. This
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timestamp is presented via a key called ``last_active_ago`` which gives the
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relative number of milliseconds since the pro-active event.
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The server will automatically set a user's presence to ``unavailable`` if their
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last active time was over a threshold value (e.g. 5 minutes). Clients can
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manually set a user's presence to ``unavailable``. Any activity that bumps the
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last active time on any of the user's clients will cause the server to
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automatically set their presence to ``online``.
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Security considerations
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-----------------------
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Presence information is shared with all users who share a room with the target
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user. In large public rooms this could be undesirable.
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Erik Johnston
8 years ago
committed by