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using LibMatrix.Filters;
using LibMatrix.Helpers;
using LibMatrix.Homeservers;
using LibMatrix.RoomTypes;
namespace MatrixAntiDmSpam;
public class PolicyListFetcher(ILogger<PolicyListFetcher> logger, AntiDmSpamConfiguration config, AuthenticatedHomeserverGeneric homeserver, PolicyStore policyStore)
: IHostedService {
private CancellationTokenSource _cts = new();
public async Task StartAsync(CancellationToken cancellationToken) {
// _ = Enumerable.Range(0, 10_000_000).Select(x => {
// policyStore.AllPolicies.Add(Guid.NewGuid().ToString(), new UserPolicyRuleEventContent() {
// Entity = Guid.NewGuid().ToString() + x,
// Reason = "meow " + x,
// Recommendation = "m.ban"
// });
// return 0;
// }).ToList();
logger.LogInformation("Starting policy list fetcher");
await EnsurePolicyListsJoined();
_ = SyncPolicyLists();
}
public async Task StopAsync(CancellationToken cancellationToken) {
logger.LogInformation("Stopping policy list fetcher");
await _cts.CancelAsync();
}
private async Task EnsurePolicyListsJoined() {
var joinedRooms = await homeserver.GetJoinedRooms();
var expectedPolicyRooms = config.PolicyLists;
var missingRooms = expectedPolicyRooms.Where(room => !joinedRooms.Any(r => r.RoomId == room.RoomId)).ToList();
await Task.WhenAll(missingRooms.Select(async room => {
logger.LogInformation("Joining policy list room {}", room.RoomId);
await homeserver.GetRoom(room.RoomId).JoinAsync(room.Vias);
}).ToList());
}
private async Task SyncPolicyLists() {
var syncHelper = new SyncHelper(homeserver, logger) {
Timeout = 30_000,
MinimumDelay = TimeSpan.FromSeconds(3),
FilterId = (await homeserver.UploadFilterAsync(new SyncFilter() {
AccountData = SyncFilter.EventFilter.Empty,
Presence = SyncFilter.EventFilter.Empty,
Room = new SyncFilter.RoomFilter {
AccountData = SyncFilter.RoomFilter.StateFilter.Empty,
Ephemeral = SyncFilter.RoomFilter.StateFilter.Empty,
State = new SyncFilter.RoomFilter.StateFilter(types: PolicyRoom.SpecPolicyEventTypes.ToList()),
Timeline = new SyncFilter.RoomFilter.StateFilter(types: PolicyRoom.SpecPolicyEventTypes.ToList()),
Rooms = config.PolicyLists.Select(x => x.RoomId).ToList(),
IncludeLeave = false
}
})).FilterId
};
await foreach (var syncResponse in syncHelper.EnumerateSyncAsync(_cts.Token)) {
if (_cts.IsCancellationRequested) return;
if (syncResponse is { Rooms.Join.Count: > 0 }) {
foreach (var (roomId, data) in syncResponse.Rooms.Join) {
if (!config.PolicyLists.Any(x => x.RoomId == roomId)) continue;
if (data.State?.Events is null)
data.State = new() { Events = [] };
if (data.Timeline is { Events.Count: > 0 }) {
data.State.Events.AddRange(data.Timeline.Events);
data.Timeline = null;
}
}
var newPolicies = syncResponse.Rooms!.Join!.SelectMany(x => x.Value.State!.Events!)
.Where(x => PolicyRoom.SpecPolicyEventTypes.Contains(x.Type))
.ToList();
logger.LogWarning("Received non-empty sync response with {}/{}/{} rooms, resulting in {} policies", syncResponse.Rooms?.Join?.Count,
syncResponse.Rooms?.Invite?.Count,
syncResponse.Rooms?.Leave?.Count, newPolicies.Count);
await policyStore.AddPoliciesAsync(newPolicies);
}
}
}
}
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