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matrix-dart-sdk
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refactor: Simpler update user device keys

This commit is contained in:
Christian Kußowski 2025-10-30 13:13:38 +01:00
parent 96f1f056e9
commit 0008ae380f
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1 changed files with 54 additions and 22 deletions
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60
lib/src/client.dart
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@ -2235,8 +2235,8 @@ class Client extends MatrixApi {
await dispose();
}
_id = accessToken = _syncFilterId =
homeserver = _userID = _deviceID = _deviceName = _prevBatch = null;
_id = accessToken = _syncFilterId = homeserver =
_userID = _deviceID = _deviceName = _prevBatch = _trackedUserIds = null;
_rooms = [];
_eventsPendingDecryption.clear();
await encryption?.dispose();
@ -2547,6 +2547,7 @@ class Client extends MatrixApi {
for (final userId in deviceLists.left ?? []) {
if (_userDeviceKeys.containsKey(userId)) {
_userDeviceKeys.remove(userId);
_trackedUserIds?.remove(userId);
}
}
}
@ -2815,16 +2816,26 @@ class Client extends MatrixApi {
final callEvents = <Event>[];
for (var event in events) {
if (event.type == EventTypes.Encryption) {
// The client must ignore any new m.room.encryption event to prevent
// man-in-the-middle attacks!
if ((event.type == EventTypes.Encryption &&
room.encrypted &&
if ((room.encrypted &&
event.content.tryGet<String>('algorithm') !=
room
.getState(EventTypes.Encryption)
?.content
.tryGet<String>('algorithm'))) {
Logs().wtf(
'Received an `m.room.encryption` event in a room, where encryption is already enabled! This event must be ignored as it could be an attack!',
jsonEncode(event.toJson()),
);
continue;
} else {
// Encryption has been enabled in a room -> Reset tracked user IDs so
// sync they can be calculated again.
Logs().i('End to end encryption enabled in', room.id);
_trackedUserIds = null;
}
}
if (event is MatrixEvent &&
@ -3058,10 +3069,20 @@ class Client extends MatrixApi {
final event = Event.fromMatrixEvent(eventUpdate, room);
// Update the room state:
if (event.stateKey != null &&
final stateKey = event.stateKey;
if (stateKey != null &&
(!room.partial || importantStateEvents.contains(event.type))) {
room.setState(event);
if (room.encrypted &&
event.type == EventTypes.RoomMember &&
{'join', 'invite'}
.contains(event.content.tryGet<String>('membership'))) {
// New members should be added to the tracked user IDs for encryption:
_trackedUserIds?.add(stateKey);
}
}
if (type != EventUpdateType.timeline) break;
// Is this event redacting the last event?
@ -3197,13 +3218,11 @@ class Client extends MatrixApi {
for (final room in rooms) {
if (room.encrypted && room.membership == Membership.join) {
try {
final userList = await room.requestParticipants();
for (final user in userList) {
if ([Membership.join, Membership.invite]
.contains(user.membership)) {
userIds.add(user.id);
}
}
final userList = await room.requestParticipants(
[Membership.join, Membership.invite],
true,
);
userIds.addAll(userList.map((user) => user.id));
} catch (e, s) {
Logs().e('[E2EE] Failed to fetch participants', e, s);
}
@ -3214,13 +3233,25 @@ class Client extends MatrixApi {
final Map<String, DateTime> _keyQueryFailures = {};
/// These are the user IDs we share an encrypted room with and need to track
/// the devices from, cached here for performance reasons.
/// It gets initialized after the first sync of every
/// instance and then updated on member changes or sync device changes.
Set<String>? _trackedUserIds;
Future<void> updateUserDeviceKeys({Set<String>? additionalUsers}) async {
try {
final database = this.database;
if (!isLogged()) return;
final dbActions = <Future<dynamic> Function()>[];
final trackedUserIds = await _getUserIdsInEncryptedRooms();
if (!isLogged()) return;
final trackedUserIds =
_trackedUserIds ??= await _getUserIdsInEncryptedRooms();
if (!isLogged()) {
// For the case we get logged out while `_getUserIdsInEncryptedRooms()`
// was already started.
_trackedUserIds = null;
return;
}
trackedUserIds.add(userID!);
if (additionalUsers != null) trackedUserIds.addAll(additionalUsers);
@ -3760,6 +3791,7 @@ class Client extends MatrixApi {
Future<void> clearCache() async {
await abortSync();
_prevBatch = null;
_trackedUserIds = null;
rooms.clear();
await database.clearCache();
encryption?.keyManager.clearOutboundGroupSessions();