125 lines
4.0 KiB
JavaScript
125 lines
4.0 KiB
JavaScript
'use strict';
|
||
|
||
const assert = require('assert');
|
||
const urlJoin = require('url-join');
|
||
|
||
const { fetchEndpointAsJson } = require('./lib/fetch-endpoint');
|
||
|
||
const config = require('./lib/config');
|
||
const matrixServerUrl = config.get('matrixServerUrl');
|
||
assert(matrixServerUrl);
|
||
|
||
// Find an event right ahead of where we are trying to look. Then paginate
|
||
// /messages backwards. This makes sure that we can get events for the day
|
||
// when the room started.
|
||
//
|
||
// Consider this scenario: dayStart(fromTs) <---- msg1 <- msg2 <-- msg3 <---- dayEnd(toTs)
|
||
// - ❌ If we start from dayStart and look backwards, we will find nothing.
|
||
// - ❌ If we start from dayStart and look forwards, we will find msg1, but federated backfill won't be able to paginate forwards
|
||
// - ✅ If we start from dayEnd and look backwards, we will msg3
|
||
// - ❌ If we start from dayEnd and look forwards, we will find nothing
|
||
//
|
||
// Returns events in reverse-chronological order.
|
||
async function fetchEventsFromTimestampBackwards(accessToken, roomId, ts, limit) {
|
||
assert(accessToken);
|
||
assert(roomId);
|
||
assert(ts);
|
||
assert(limit);
|
||
|
||
// TODO: Only join world_readable rooms. Perhaps we want to serve public rooms
|
||
// where we have been invited. GET
|
||
// /_matrix/client/v3/directory/list/room/{roomId} (Gets the visibility of a
|
||
// given room on the server’s public room directory.)
|
||
const joinEndpoint = urlJoin(matrixServerUrl, `_matrix/client/r0/join/${roomId}`);
|
||
await fetchEndpointAsJson(joinEndpoint, {
|
||
method: 'POST',
|
||
accessToken,
|
||
});
|
||
|
||
const timestampToEventEndpoint = urlJoin(
|
||
matrixServerUrl,
|
||
`_matrix/client/unstable/org.matrix.msc3030/rooms/${roomId}/timestamp_to_event?ts=${ts}&dir=b`
|
||
);
|
||
const timestampToEventResData = await fetchEndpointAsJson(timestampToEventEndpoint, {
|
||
accessToken,
|
||
});
|
||
const eventIdForTimestamp = timestampToEventResData.event_id;
|
||
assert(eventIdForTimestamp);
|
||
//console.log('eventIdForTimestamp', eventIdForTimestamp);
|
||
|
||
const contextEndpoint = urlJoin(
|
||
matrixServerUrl,
|
||
`_matrix/client/r0/rooms/${roomId}/context/${eventIdForTimestamp}?limit=0`
|
||
);
|
||
const contextResData = await fetchEndpointAsJson(contextEndpoint, {
|
||
accessToken,
|
||
});
|
||
//console.log('contextResData', contextResData);
|
||
|
||
// Add filter={"lazy_load_members":true,"include_redundant_members":true} to get member state events included
|
||
const messagesEndpoint = urlJoin(
|
||
matrixServerUrl,
|
||
`_matrix/client/r0/rooms/${roomId}/messages?dir=b&from=${contextResData.start}&limit=${limit}&filter={"lazy_load_members":true,"include_redundant_members":true}`
|
||
);
|
||
const messageResData = await fetchEndpointAsJson(messagesEndpoint, {
|
||
accessToken,
|
||
});
|
||
|
||
//console.log('messageResData.state', messageResData.state);
|
||
const stateEventMap = {};
|
||
for (const stateEvent of messageResData.state || []) {
|
||
if (stateEvent.type === 'm.room.member') {
|
||
stateEventMap[stateEvent.state_key] = stateEvent;
|
||
}
|
||
}
|
||
|
||
return {
|
||
stateEventMap,
|
||
events: messageResData.chunk,
|
||
};
|
||
}
|
||
|
||
async function fetchEventsInRange(accessToken, roomId, startTs, endTs, limit) {
|
||
assert(accessToken);
|
||
assert(roomId);
|
||
assert(startTs);
|
||
assert(endTs);
|
||
assert(limit);
|
||
|
||
// Fetch events from endTs and before
|
||
const { events, stateEventMap } = await fetchEventsFromTimestampBackwards(
|
||
accessToken,
|
||
roomId,
|
||
endTs,
|
||
limit
|
||
);
|
||
|
||
let eventsInRange = events;
|
||
// `events` are in reverse-chronological order.
|
||
// We only need to filter if the oldest message is before startTs
|
||
if (events[events.length - 1].origin_server_ts < startTs) {
|
||
eventsInRange = [];
|
||
|
||
// Let's iterate until we see events before startTs
|
||
for (let i = 0; i < events.length; i++) {
|
||
const event = events[i];
|
||
|
||
// Once we found an event before startTs, the rest are outside of our range
|
||
if (event.origin_server_ts < startTs) {
|
||
break;
|
||
}
|
||
|
||
eventsInRange.push(event);
|
||
}
|
||
}
|
||
|
||
const chronologicalEventsInRange = eventsInRange.reverse();
|
||
|
||
return {
|
||
stateEventMap,
|
||
events: chronologicalEventsInRange,
|
||
};
|
||
}
|
||
|
||
module.exports = fetchEventsInRange;
|