622 lines
20 KiB
Dart
622 lines
20 KiB
Dart
/*
|
|
* Famedly Matrix SDK
|
|
* Copyright (C) 2019, 2020, 2021 Famedly GmbH
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as
|
|
* published by the Free Software Foundation, either version 3 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
import 'dart:async';
|
|
import 'dart:convert';
|
|
|
|
import 'package:collection/collection.dart';
|
|
|
|
import 'package:matrix/matrix.dart';
|
|
import 'package:matrix/src/models/timeline_chunk.dart';
|
|
|
|
/// Represents the timeline of a room. The callback [onUpdate] will be triggered
|
|
/// automatically. The initial
|
|
/// event list will be retreived when created by the `room.getTimeline()` method.
|
|
|
|
class Timeline {
|
|
final Room room;
|
|
List<Event> get events => chunk.events;
|
|
|
|
/// Map of event ID to map of type to set of aggregated events
|
|
final Map<String, Map<String, Set<Event>>> aggregatedEvents = {};
|
|
|
|
final void Function()? onUpdate;
|
|
final void Function(int index)? onChange;
|
|
final void Function(int index)? onInsert;
|
|
final void Function(int index)? onRemove;
|
|
final void Function()? onNewEvent;
|
|
|
|
StreamSubscription<EventUpdate>? sub;
|
|
StreamSubscription<SyncUpdate>? roomSub;
|
|
StreamSubscription<String>? sessionIdReceivedSub;
|
|
bool isRequestingHistory = false;
|
|
bool isRequestingFuture = false;
|
|
|
|
bool allowNewEvent = true;
|
|
bool isFragmentedTimeline = false;
|
|
|
|
final Map<String, Event> _eventCache = {};
|
|
|
|
TimelineChunk chunk;
|
|
|
|
/// Searches for the event in this timeline. If not
|
|
/// found, requests from the server. Requested events
|
|
/// are cached.
|
|
Future<Event?> getEventById(String id) async {
|
|
for (final event in events) {
|
|
if (event.eventId == id) return event;
|
|
}
|
|
if (_eventCache.containsKey(id)) return _eventCache[id];
|
|
final requestedEvent = await room.getEventById(id);
|
|
if (requestedEvent == null) return null;
|
|
_eventCache[id] = requestedEvent;
|
|
return _eventCache[id];
|
|
}
|
|
|
|
// When fetching history, we will collect them into the `_historyUpdates` set
|
|
// first, and then only process all events at once, once we have the full history.
|
|
// This ensures that the entire history fetching only triggers `onUpdate` only *once*,
|
|
// even if /sync's complete while history is being proccessed.
|
|
bool _collectHistoryUpdates = false;
|
|
|
|
bool get canRequestHistory {
|
|
if (events.isEmpty) return true;
|
|
return events.last.type != EventTypes.RoomCreate;
|
|
}
|
|
|
|
Future<void> requestHistory(
|
|
{int historyCount = Room.defaultHistoryCount}) async {
|
|
if (isRequestingHistory) {
|
|
return;
|
|
}
|
|
|
|
isRequestingHistory = true;
|
|
await _requestEvents(direction: Direction.b, historyCount: historyCount);
|
|
isRequestingHistory = false;
|
|
}
|
|
|
|
bool get canRequestFuture => !allowNewEvent;
|
|
|
|
Future<void> requestFuture(
|
|
{int historyCount = Room.defaultHistoryCount}) async {
|
|
if (allowNewEvent) {
|
|
return; // we shouldn't force to add new events if they will autatically be added
|
|
}
|
|
|
|
if (isRequestingFuture) return;
|
|
isRequestingFuture = true;
|
|
await _requestEvents(direction: Direction.f, historyCount: historyCount);
|
|
isRequestingFuture = false;
|
|
}
|
|
|
|
Future<void> _requestEvents(
|
|
{int historyCount = Room.defaultHistoryCount,
|
|
required Direction direction}) async {
|
|
onUpdate?.call();
|
|
|
|
try {
|
|
// Look up for events in the database first. With fragmented view, we should delete the database cache
|
|
final eventsFromStore = isFragmentedTimeline
|
|
? null
|
|
: await room.client.database?.getEventList(
|
|
room,
|
|
start: events.length,
|
|
limit: Room.defaultHistoryCount,
|
|
);
|
|
|
|
if (eventsFromStore != null && eventsFromStore.isNotEmpty) {
|
|
// Fetch all users from database we have got here.
|
|
for (final event in events) {
|
|
if (room.getState(EventTypes.RoomMember, event.senderId) != null) {
|
|
continue;
|
|
}
|
|
final dbUser =
|
|
await room.client.database?.getUser(event.senderId, room);
|
|
if (dbUser != null) room.setState(dbUser);
|
|
}
|
|
|
|
if (direction == Direction.b) {
|
|
events.addAll(eventsFromStore);
|
|
final startIndex = events.length - eventsFromStore.length;
|
|
final endIndex = events.length;
|
|
for (var i = startIndex; i < endIndex; i++) {
|
|
onInsert?.call(i);
|
|
}
|
|
} else {
|
|
events.insertAll(0, eventsFromStore);
|
|
final startIndex = eventsFromStore.length;
|
|
final endIndex = 0;
|
|
for (var i = startIndex; i > endIndex; i--) {
|
|
onInsert?.call(i);
|
|
}
|
|
}
|
|
} else {
|
|
Logs().i('No more events found in the store. Request from server...');
|
|
if (isFragmentedTimeline) {
|
|
await getRoomEvents(
|
|
historyCount: historyCount,
|
|
direction: direction,
|
|
);
|
|
} else {
|
|
await room.requestHistory(
|
|
historyCount: historyCount,
|
|
direction: direction,
|
|
onHistoryReceived: () {
|
|
_collectHistoryUpdates = true;
|
|
},
|
|
);
|
|
}
|
|
}
|
|
} finally {
|
|
_collectHistoryUpdates = false;
|
|
isRequestingHistory = false;
|
|
onUpdate?.call();
|
|
}
|
|
}
|
|
|
|
/// Request more previous events from the server. [historyCount] defines how much events should
|
|
/// be received maximum. When the request is answered, [onHistoryReceived] will be triggered **before**
|
|
/// the historical events will be published in the onEvent stream.
|
|
/// Returns the actual count of received timeline events.
|
|
Future<int> getRoomEvents(
|
|
{int historyCount = Room.defaultHistoryCount,
|
|
direction = Direction.b}) async {
|
|
final resp = await room.client.getRoomEvents(
|
|
room.id,
|
|
direction,
|
|
from: direction == Direction.b ? chunk.prevBatch : chunk.nextBatch,
|
|
limit: historyCount,
|
|
filter: jsonEncode(StateFilter(lazyLoadMembers: true).toJson()),
|
|
);
|
|
|
|
if (resp.end == null) {
|
|
Logs().w('We reached the end of the timeline');
|
|
}
|
|
|
|
final newNextBatch = direction == Direction.b ? resp.start : resp.end;
|
|
final newPrevBatch = direction == Direction.b ? resp.end : resp.start;
|
|
|
|
final type = direction == Direction.b
|
|
? EventUpdateType.history
|
|
: EventUpdateType.timeline;
|
|
|
|
if ((resp.state?.length ?? 0) == 0 &&
|
|
resp.start != resp.end &&
|
|
newPrevBatch != null &&
|
|
newNextBatch != null) {
|
|
if (type == EventUpdateType.history) {
|
|
Logs().w(
|
|
'[nav] we can still request history prevBatch: $type $newPrevBatch');
|
|
} else {
|
|
Logs().w(
|
|
'[nav] we can still request timeline nextBatch: $type $newNextBatch');
|
|
}
|
|
}
|
|
|
|
final newEvents =
|
|
resp.chunk.map((e) => Event.fromMatrixEvent(e, room)).toList();
|
|
|
|
if (!allowNewEvent) {
|
|
if (resp.start == resp.end ||
|
|
(resp.end == null && direction == Direction.f)) allowNewEvent = true;
|
|
|
|
if (allowNewEvent) {
|
|
Logs().d('We now allow sync update into the timeline.');
|
|
newEvents.addAll(
|
|
await room.client.database?.getEventList(room, onlySending: true) ??
|
|
[]);
|
|
}
|
|
}
|
|
|
|
// Try to decrypt encrypted events but don't update the database.
|
|
if (room.encrypted && room.client.encryptionEnabled) {
|
|
for (var i = 0; i < newEvents.length; i++) {
|
|
if (newEvents[i].type == EventTypes.Encrypted) {
|
|
newEvents[i] = await room.client.encryption!
|
|
.decryptRoomEvent(room.id, newEvents[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// update chunk anchors
|
|
if (type == EventUpdateType.history) {
|
|
chunk.prevBatch = newPrevBatch ?? '';
|
|
|
|
final offset = chunk.events.length;
|
|
|
|
chunk.events.addAll(newEvents);
|
|
|
|
for (var i = 0; i < newEvents.length; i++) {
|
|
onInsert?.call(i + offset);
|
|
}
|
|
} else {
|
|
chunk.nextBatch = newNextBatch ?? '';
|
|
chunk.events.insertAll(0, newEvents.reversed);
|
|
|
|
for (var i = 0; i < newEvents.length; i++) {
|
|
onInsert?.call(i);
|
|
}
|
|
}
|
|
|
|
if (onUpdate != null) {
|
|
onUpdate!();
|
|
}
|
|
return resp.chunk.length;
|
|
}
|
|
|
|
Timeline(
|
|
{required this.room,
|
|
this.onUpdate,
|
|
this.onChange,
|
|
this.onInsert,
|
|
this.onRemove,
|
|
this.onNewEvent,
|
|
required this.chunk}) {
|
|
sub = room.client.onEvent.stream.listen(_handleEventUpdate);
|
|
|
|
// If the timeline is limited we want to clear our events cache
|
|
roomSub = room.client.onSync.stream
|
|
.where((sync) => sync.rooms?.join?[room.id]?.timeline?.limited == true)
|
|
.listen(_removeEventsNotInThisSync);
|
|
|
|
sessionIdReceivedSub =
|
|
room.onSessionKeyReceived.stream.listen(_sessionKeyReceived);
|
|
|
|
// we want to populate our aggregated events
|
|
for (final e in events) {
|
|
addAggregatedEvent(e);
|
|
}
|
|
|
|
// we are using a fragmented timeline
|
|
if (chunk.nextBatch != '') {
|
|
allowNewEvent = false;
|
|
isFragmentedTimeline = true;
|
|
}
|
|
}
|
|
|
|
/// Removes all entries from [events] which are not in this SyncUpdate.
|
|
void _removeEventsNotInThisSync(SyncUpdate sync) {
|
|
final newSyncEvents = sync.rooms?.join?[room.id]?.timeline?.events ?? [];
|
|
final keepEventIds = newSyncEvents.map((e) => e.eventId);
|
|
events.removeWhere((e) => !keepEventIds.contains(e.eventId));
|
|
}
|
|
|
|
/// Don't forget to call this before you dismiss this object!
|
|
void cancelSubscriptions() {
|
|
sub?.cancel();
|
|
roomSub?.cancel();
|
|
sessionIdReceivedSub?.cancel();
|
|
}
|
|
|
|
void _sessionKeyReceived(String sessionId) async {
|
|
var decryptAtLeastOneEvent = false;
|
|
Future<void> decryptFn() async {
|
|
final encryption = room.client.encryption;
|
|
if (!room.client.encryptionEnabled || encryption == null) {
|
|
return;
|
|
}
|
|
for (var i = 0; i < events.length; i++) {
|
|
if (events[i].type == EventTypes.Encrypted &&
|
|
events[i].messageType == MessageTypes.BadEncrypted &&
|
|
events[i].content['session_id'] == sessionId) {
|
|
events[i] = await encryption.decryptRoomEvent(room.id, events[i],
|
|
store: true);
|
|
onChange?.call(i);
|
|
if (events[i].type != EventTypes.Encrypted) {
|
|
decryptAtLeastOneEvent = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (room.client.database != null) {
|
|
await room.client.database?.transaction(decryptFn);
|
|
} else {
|
|
await decryptFn();
|
|
}
|
|
if (decryptAtLeastOneEvent) onUpdate?.call();
|
|
}
|
|
|
|
/// Request the keys for undecryptable events of this timeline
|
|
void requestKeys({
|
|
bool tryOnlineBackup = true,
|
|
bool onlineKeyBackupOnly = true,
|
|
}) {
|
|
for (final event in events) {
|
|
if (event.type == EventTypes.Encrypted &&
|
|
event.messageType == MessageTypes.BadEncrypted &&
|
|
event.content['can_request_session'] == true) {
|
|
try {
|
|
room.client.encryption?.keyManager.maybeAutoRequest(
|
|
room.id,
|
|
event.content['session_id'],
|
|
event.content['sender_key'],
|
|
tryOnlineBackup: tryOnlineBackup,
|
|
onlineKeyBackupOnly: onlineKeyBackupOnly,
|
|
);
|
|
} catch (_) {
|
|
// dispose
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Set the read marker to the last synced event in this timeline.
|
|
Future<void> setReadMarker([String? eventId]) async {
|
|
eventId ??=
|
|
events.firstWhereOrNull((event) => event.status.isSynced)?.eventId;
|
|
if (eventId == null) return;
|
|
return room.setReadMarker(eventId, mRead: eventId);
|
|
}
|
|
|
|
int _findEvent({String? event_id, String? unsigned_txid}) {
|
|
// we want to find any existing event where either the passed event_id or the passed unsigned_txid
|
|
// matches either the event_id or transaction_id of the existing event.
|
|
// For that we create two sets, searchNeedle, what we search, and searchHaystack, where we check if there is a match.
|
|
// Now, after having these two sets, if the intersect between them is non-empty, we know that we have at least one match in one pair,
|
|
// thus meaning we found our element.
|
|
final searchNeedle = <String>{};
|
|
if (event_id != null) {
|
|
searchNeedle.add(event_id);
|
|
}
|
|
if (unsigned_txid != null) {
|
|
searchNeedle.add(unsigned_txid);
|
|
}
|
|
int i;
|
|
for (i = 0; i < events.length; i++) {
|
|
final searchHaystack = <String>{events[i].eventId};
|
|
|
|
final txnid = events[i].unsigned?['transaction_id'];
|
|
if (txnid != null) {
|
|
searchHaystack.add(txnid);
|
|
}
|
|
if (searchNeedle.intersection(searchHaystack).isNotEmpty) {
|
|
break;
|
|
}
|
|
}
|
|
return i;
|
|
}
|
|
|
|
void _removeEventFromSet(Set<Event> eventSet, Event event) {
|
|
eventSet.removeWhere((e) =>
|
|
e.matchesEventOrTransactionId(event.eventId) ||
|
|
(event.unsigned != null &&
|
|
e.matchesEventOrTransactionId(event.unsigned?['transaction_id'])));
|
|
}
|
|
|
|
void addAggregatedEvent(Event event) {
|
|
// we want to add an event to the aggregation tree
|
|
final relationshipType = event.relationshipType;
|
|
final relationshipEventId = event.relationshipEventId;
|
|
if (relationshipType == null || relationshipEventId == null) {
|
|
return; // nothing to do
|
|
}
|
|
final events = (aggregatedEvents[relationshipEventId] ??=
|
|
<String, Set<Event>>{})[relationshipType] ??= <Event>{};
|
|
// remove a potential old event
|
|
_removeEventFromSet(events, event);
|
|
// add the new one
|
|
events.add(event);
|
|
if (onChange != null) {
|
|
final index = _findEvent(event_id: relationshipEventId);
|
|
onChange?.call(index);
|
|
}
|
|
}
|
|
|
|
void removeAggregatedEvent(Event event) {
|
|
aggregatedEvents.remove(event.eventId);
|
|
if (event.unsigned != null) {
|
|
aggregatedEvents.remove(event.unsigned?['transaction_id']);
|
|
}
|
|
for (final types in aggregatedEvents.values) {
|
|
for (final events in types.values) {
|
|
_removeEventFromSet(events, event);
|
|
}
|
|
}
|
|
}
|
|
|
|
void _handleEventUpdate(EventUpdate eventUpdate, {bool update = true}) {
|
|
try {
|
|
if (eventUpdate.roomID != room.id) return;
|
|
|
|
if (eventUpdate.type != EventUpdateType.timeline &&
|
|
eventUpdate.type != EventUpdateType.history) {
|
|
return;
|
|
}
|
|
|
|
if (eventUpdate.type == EventUpdateType.timeline) {
|
|
onNewEvent?.call();
|
|
}
|
|
|
|
if (!allowNewEvent) return;
|
|
|
|
final status = eventStatusFromInt(eventUpdate.content['status'] ??
|
|
(eventUpdate.content['unsigned'] is Map<String, dynamic>
|
|
? eventUpdate.content['unsigned'][messageSendingStatusKey]
|
|
: null) ??
|
|
EventStatus.synced.intValue);
|
|
|
|
if (status.isRemoved) {
|
|
final i = _findEvent(event_id: eventUpdate.content['event_id']);
|
|
if (i < events.length) {
|
|
removeAggregatedEvent(events[i]);
|
|
events.removeAt(i);
|
|
onRemove?.call(i);
|
|
}
|
|
} else {
|
|
final i = _findEvent(
|
|
event_id: eventUpdate.content['event_id'],
|
|
unsigned_txid: eventUpdate.content['unsigned'] is Map
|
|
? eventUpdate.content['unsigned']['transaction_id']
|
|
: null);
|
|
|
|
if (i < events.length) {
|
|
// if the old status is larger than the new one, we also want to preserve the old status
|
|
final oldStatus = events[i].status;
|
|
events[i] = Event.fromJson(
|
|
eventUpdate.content,
|
|
room,
|
|
);
|
|
// do we preserve the status? we should allow 0 -> -1 updates and status increases
|
|
if ((latestEventStatus(status, oldStatus) == oldStatus) &&
|
|
!(status.isError && oldStatus.isSending)) {
|
|
events[i].status = oldStatus;
|
|
}
|
|
addAggregatedEvent(events[i]);
|
|
onChange?.call(i);
|
|
} else {
|
|
final newEvent = Event.fromJson(
|
|
eventUpdate.content,
|
|
room,
|
|
);
|
|
|
|
if (eventUpdate.type == EventUpdateType.history &&
|
|
events.indexWhere(
|
|
(e) => e.eventId == eventUpdate.content['event_id']) !=
|
|
-1) return;
|
|
var index = events.length;
|
|
if (eventUpdate.type == EventUpdateType.history) {
|
|
events.add(newEvent);
|
|
} else {
|
|
index = events.firstIndexWhereNotError;
|
|
events.insert(index, newEvent);
|
|
}
|
|
onInsert?.call(index);
|
|
|
|
addAggregatedEvent(newEvent);
|
|
}
|
|
}
|
|
|
|
// Handle redaction events
|
|
if (eventUpdate.content['type'] == EventTypes.Redaction) {
|
|
final index =
|
|
_findEvent(event_id: eventUpdate.content.tryGet<String>('redacts'));
|
|
if (index < events.length) {
|
|
removeAggregatedEvent(events[index]);
|
|
|
|
// Is the redacted event a reaction? Then update the event this
|
|
// belongs to:
|
|
if (onChange != null) {
|
|
final relationshipEventId = events[index].relationshipEventId;
|
|
if (relationshipEventId != null) {
|
|
onChange?.call(_findEvent(event_id: relationshipEventId));
|
|
return;
|
|
}
|
|
}
|
|
|
|
events[index].setRedactionEvent(Event.fromJson(
|
|
eventUpdate.content,
|
|
room,
|
|
));
|
|
onChange?.call(index);
|
|
}
|
|
}
|
|
|
|
if (update && !_collectHistoryUpdates) {
|
|
onUpdate?.call();
|
|
}
|
|
} catch (e, s) {
|
|
Logs().w('Handle event update failed', e, s);
|
|
}
|
|
}
|
|
|
|
/// Searches [searchTerm] in this timeline. It first searches in the
|
|
/// cache, then in the database and then on the server. The search can
|
|
/// take a while, which is why this returns a stream so the already found
|
|
/// events can already be displayed.
|
|
/// Override the [searchFunc] if you need another search. This will then
|
|
/// ignore [searchTerm].
|
|
Stream<List<Event>> searchEvent({
|
|
String? searchTerm,
|
|
int requestHistoryCount = 100,
|
|
int maxHistoryRequests = 10,
|
|
bool Function(Event)? searchFunc,
|
|
}) async* {
|
|
assert(searchTerm != null || searchFunc != null);
|
|
searchFunc ??= (event) =>
|
|
event.body.toLowerCase().contains(searchTerm?.toLowerCase() ?? '');
|
|
final found = <Event>[];
|
|
// Search locally
|
|
for (final event in events) {
|
|
if (searchFunc(event)) {
|
|
yield found..add(event);
|
|
}
|
|
}
|
|
|
|
// Search in database
|
|
var start = events.length;
|
|
while (true) {
|
|
final eventsFromStore = await room.client.database?.getEventList(
|
|
room,
|
|
start: start,
|
|
limit: requestHistoryCount,
|
|
) ??
|
|
[];
|
|
if (eventsFromStore.isEmpty) break;
|
|
start += eventsFromStore.length;
|
|
for (final event in events) {
|
|
if (searchFunc(event)) {
|
|
yield found..add(event);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Search on the server
|
|
var prevBatch = room.prev_batch;
|
|
final encryption = room.client.encryption;
|
|
for (var i = 0; i < maxHistoryRequests; i++) {
|
|
if (prevBatch == null) break;
|
|
try {
|
|
final resp = await room.client.getRoomEvents(
|
|
room.id,
|
|
Direction.b,
|
|
from: prevBatch,
|
|
limit: requestHistoryCount,
|
|
filter: jsonEncode(StateFilter(lazyLoadMembers: true).toJson()),
|
|
);
|
|
for (final matrixEvent in resp.chunk) {
|
|
var event = Event.fromMatrixEvent(matrixEvent, room);
|
|
if (event.type == EventTypes.Encrypted && encryption != null) {
|
|
event = await encryption.decryptRoomEvent(room.id, event);
|
|
}
|
|
if (searchFunc(event)) {
|
|
yield found..add(event);
|
|
}
|
|
}
|
|
prevBatch = resp.end;
|
|
} on MatrixException catch (e) {
|
|
// We have no permission anymore to request the history
|
|
if (e.error == MatrixError.M_FORBIDDEN) {
|
|
break;
|
|
}
|
|
rethrow;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
extension on List<Event> {
|
|
int get firstIndexWhereNotError {
|
|
if (isEmpty) return 0;
|
|
final index = indexWhere((event) => !event.status.isError);
|
|
if (index == -1) return length;
|
|
return index;
|
|
}
|
|
}
|