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matrix-spec-proposals/specification/46_receipts.rst

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Receipts
========
Receipts are used to publish which events in a room the user or their devices
have interacted with. For example, which events the user has read.
For efficiency this is done as "up to" markers, i.e. marking a particular event
as, say, ``read`` indicates the user has read all events *up to* that event.
Client-Server API
-----------------
Clients will receive receipts in the following format::
{
"type": "m.receipt",
"room_id": <room_id>,
"content": {
<event_id>: {
<receipt_type>: {
<user_id>: { "ts": <ts>, ... },
...
}
},
...
}
}
For example::
{
"type": "m.receipt",
"room_id": "!KpjVgQyZpzBwvMBsnT:matrix.org",
"content": {
"$1435641916114394fHBLK:matrix.org": {
"read": {
"@erikj:jki.re": { "ts": 1436451550453 },
...
}
},
...
}
}
For efficiency, receipts are batched into one event per room. In the initialSync
and v2 sync APIs the receipts are listed in a seperate top level ``receipts``
key.
Each ``user_id``, ``receipt_type`` pair must be associated with only a single
``event_id``.
New receipts that come down the event streams are deltas. Deltas update
existing mappings, clobbering based on ``user_id``, ``receipt_type`` pairs.
A client can update the markers for its user by issuing a request::
POST /_matrix/client/v2_alpha/rooms/<room_id>/receipt/read/<event_id>
Where the contents of the ``POST`` will be included in the content sent to
other users. The server will automatically set the ``ts`` field.
Server-Server API
-----------------
Receipts are sent across federation as EDUs with type ``m.receipt``. The
format of the EDUs are::
{
<room_id>: {
<receipt_type>: {
<user_id>: { <content> }
},
...
},
...
}
These are always sent as deltas to previously sent reciepts.