matrix-spec/specification/modules/receipts.rst
Kegan Dougal 365a9076b9 Add nested dict template support; Add x-pattern
For cases where event schema specify `patternProperties` it would be nice
to give that pattern a "human-readable" form rather than a raw regex. This
is now supported by specifying `x-pattern` in the value part of the specified
pattern e.g. `patternProperties:{ "^.*":{ x-pattern: "$THING", ... } }`

Templating had limited record type descriptions limited to value primitives
e.g. `{string: integer}`. It now supports inspecting the values recursively
if the value is `object`.

Updated `m.receipt` to take both these points into account to make it read
better. Tweak receipt module text.
2015-10-01 12:11:26 +01:00

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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.
Events
------
{{m_receipt_event}}
Client behaviour
----------------
- When clients should send receipts
- What clients should do when they receive these receipts
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 efficiency, receipts are batched into one event per room. In the initialSync
and v2 sync APIs the receipts are listed in a separate 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 behaviour
----------------
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 receipts.
Security considerations
-----------------------