Move around some projects, further cleanup pending github/dev/project-cleanup dev/project-cleanup

6 files changed, 762 insertions, 0 deletions

diff --git a/Utilities/LibMatrix.HomeserverEmulator/Services/HSEConfiguration.cs b/Utilities/LibMatrix.HomeserverEmulator/Services/HSEConfiguration.cs
new file mode 100644
index 0000000..73b0d23
--- /dev/null
+++ b/Utilities/LibMatrix.HomeserverEmulator/Services/HSEConfiguration.cs
@@ -0,0 +1,57 @@
+using System.Collections;
+using System.Diagnostics.CodeAnalysis;
+using ArcaneLibs.Extensions;
+
+namespace LibMatrix.HomeserverEmulator.Services;
+
+public class HSEConfiguration {
+    private static ILogger<HSEConfiguration> _logger;
+    public static HSEConfiguration Current { get; set; }
+
+    [RequiresUnreferencedCode("Uses reflection binding")]
+    public HSEConfiguration(ILogger<HSEConfiguration> logger, IConfiguration config, HostBuilderContext host) {
+        Current = this;
+        _logger = logger;
+        logger.LogInformation("Loading configuration for environment: {}...", host.HostingEnvironment.EnvironmentName);
+        config.GetSection("HomeserverEmulator").Bind(this);
+        if (StoreData) {
+            DataStoragePath = ExpandPath(DataStoragePath ?? throw new NullReferenceException("DataStoragePath is not set"));
+            CacheStoragePath = ExpandPath(CacheStoragePath ?? throw new NullReferenceException("CacheStoragePath is not set"));
+        }
+
+        _logger.LogInformation("Configuration loaded: {}", this.ToJson());
+    }
+
+    public string CacheStoragePath { get; set; }
+
+    public string DataStoragePath { get; set; }
+
+    public bool StoreData { get; set; } = true;
+    
+    public bool UnknownSyncTokenIsInitialSync { get; set; } = true;
+
+    private static string ExpandPath(string path, bool retry = true) {
+        _logger.LogInformation("Expanding path `{}`", path);
+
+        if (path.StartsWith('~')) {
+            path = Path.Join(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), path[1..]);
+        }
+
+        Environment.GetEnvironmentVariables().Cast<DictionaryEntry>().OrderByDescending(x => x.Key.ToString()!.Length).ToList().ForEach(x => {
+            path = path.Replace($"${x.Key}", x.Value.ToString());
+        });
+
+        _logger.LogInformation("Expanded path to `{}`", path);
+        var tries = 0;
+        while (retry && path.ContainsAnyOf("~$".Split())) {
+            if (tries++ > 100)
+                throw new Exception($"Path `{path}` contains unrecognised environment variables");
+            path = ExpandPath(path, false);
+        }
+        
+        if(path.StartsWith("./"))
+            path = Path.Join(Directory.GetCurrentDirectory(), path[2..].Replace("/", Path.DirectorySeparatorChar.ToString()));
+
+        return path;
+    }
+}
\ No newline at end of file
diff --git a/Utilities/LibMatrix.HomeserverEmulator/Services/MediaStore.cs b/Utilities/LibMatrix.HomeserverEmulator/Services/MediaStore.cs
new file mode 100644
index 0000000..00f2a42
--- /dev/null
+++ b/Utilities/LibMatrix.HomeserverEmulator/Services/MediaStore.cs
@@ -0,0 +1,64 @@
+using System.Text.Json;
+using LibMatrix.Services;
+
+namespace LibMatrix.HomeserverEmulator.Services;
+
+public class MediaStore {
+    private readonly HSEConfiguration _config;
+    private readonly HomeserverResolverService _hsResolver;
+    private List<MediaInfo> index = new();
+
+    public MediaStore(HSEConfiguration config, HomeserverResolverService hsResolver) {
+        _config = config;
+        _hsResolver = hsResolver;
+        if (config.StoreData) {
+            var path = Path.Combine(config.DataStoragePath, "media");
+            if (!Directory.Exists(path)) Directory.CreateDirectory(path);
+            if (File.Exists(Path.Combine(path, "index.json")))
+                index = JsonSerializer.Deserialize<List<MediaInfo>>(File.ReadAllText(Path.Combine(path, "index.json")));
+        }
+        else
+            Console.WriteLine("Data storage is disabled, not loading rooms from disk");
+    }
+
+    // public async Task<object> UploadMedia(string userId, string mimeType, Stream stream, string? filename = null) {
+        // var mediaId = $"mxc://{Guid.NewGuid().ToString()}";
+        // var path = Path.Combine(_config.DataStoragePath, "media", mediaId);
+        // if (!Directory.Exists(path)) Directory.CreateDirectory(path);
+        // var file = Path.Combine(path, filename ?? "file");
+        // await using var fs = File.Create(file);
+        // await stream.CopyToAsync(fs);
+        // index.Add(new() { });
+        // return media;
+    // }
+
+    public async Task<Stream> GetRemoteMedia(string serverName, string mediaId) {
+        if (_config.StoreData) {
+            var path = Path.Combine(_config.DataStoragePath, "media", serverName, mediaId);
+            if (!File.Exists(path)) {
+                var mediaUrl = await _hsResolver.ResolveMediaUri(serverName, $"mxc://{serverName}/{mediaId}");
+                if (mediaUrl is null)
+                    throw new MatrixException() {
+                        ErrorCode = "M_NOT_FOUND",
+                        Error = "Media not found"
+                    };
+                using var client = new HttpClient();
+                var stream = await client.GetStreamAsync(mediaUrl);
+                await using var fs = File.Create(path);
+                await stream.CopyToAsync(fs);
+            }
+            return new FileStream(path, FileMode.Open);
+        }
+        else {
+            var mediaUrl = await _hsResolver.ResolveMediaUri(serverName, $"mxc://{serverName}/{mediaId}");
+            if (mediaUrl is null)
+                throw new MatrixException() {
+                    ErrorCode = "M_NOT_FOUND",
+                    Error = "Media not found"
+                };
+            using var client = new HttpClient();
+            return await client.GetStreamAsync(mediaUrl);
+        }
+    }
+    public class MediaInfo { }
+}
\ No newline at end of file
diff --git a/Utilities/LibMatrix.HomeserverEmulator/Services/PaginationTokenResolverService.cs b/Utilities/LibMatrix.HomeserverEmulator/Services/PaginationTokenResolverService.cs
new file mode 100644
index 0000000..0128ba6
--- /dev/null
+++ b/Utilities/LibMatrix.HomeserverEmulator/Services/PaginationTokenResolverService.cs
@@ -0,0 +1,54 @@
+namespace LibMatrix.HomeserverEmulator.Services;
+
+public class PaginationTokenResolverService(ILogger<PaginationTokenResolverService> logger, RoomStore roomStore, UserStore userStore) {
+    public async Task<long?> ResolveTokenToTimestamp(string token) {
+        logger.LogTrace("ResolveTokenToTimestamp({token})", token);
+        if (token.StartsWith('$')) {
+            //we have an event ID
+            foreach (var room in roomStore._rooms) {
+                var evt = await ResolveTokenToEvent(token, room);
+                if (evt is not null) return evt.OriginServerTs;
+            }
+
+            // event not found
+            throw new NotImplementedException();
+        }
+        else {
+            // we have a sync token 
+            foreach (var user in userStore._users) {
+                foreach (var (_, session) in user.AccessTokens) {
+                    if (!session.SyncStates.TryGetValue(token, out var syncState)) continue;
+                    long? maxTs = 0;
+                    foreach (var room in syncState.RoomPositions) {
+                        var roomObj = roomStore.GetRoomById(room.Key);
+                        if (roomObj is null)
+                            continue;
+                        var ts = roomObj.Timeline.Last().OriginServerTs;
+                        if (ts > maxTs) maxTs = ts;
+                    }
+
+                    return maxTs;
+                }
+            }
+
+            throw new NotImplementedException();
+        }
+    }
+
+    public async Task<StateEventResponse?> ResolveTokenToEvent(string token, RoomStore.Room room) {
+        if (token.StartsWith('$')) {
+            //we have an event ID
+            logger.LogTrace("ResolveTokenToEvent(EventId({token}), Room({room})): searching for event...", token, room.RoomId);
+
+            var evt = room.Timeline.SingleOrDefault(x => x.EventId == token);
+            if (evt is not null) return evt;
+            logger.LogTrace("ResolveTokenToEvent({token}, Room({room})): event not in requested room...", token, room.RoomId);
+            return null;
+        }
+        else {
+            // we have a sync token
+            logger.LogTrace("ResolveTokenToEvent(SyncToken({token}), Room({room}))", token, room.RoomId);
+            throw new NotImplementedException();
+        }
+    }
+}
\ No newline at end of file
diff --git a/Utilities/LibMatrix.HomeserverEmulator/Services/RoomStore.cs b/Utilities/LibMatrix.HomeserverEmulator/Services/RoomStore.cs
new file mode 100644
index 0000000..5cdc3ab
--- /dev/null
+++ b/Utilities/LibMatrix.HomeserverEmulator/Services/RoomStore.cs
@@ -0,0 +1,308 @@
+using System.Collections.Concurrent;
+using System.Collections.Frozen;
+using System.Collections.Immutable;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using ArcaneLibs;
+using ArcaneLibs.Collections;
+using ArcaneLibs.Extensions;
+using LibMatrix.EventTypes.Spec.State;
+using LibMatrix.HomeserverEmulator.Controllers.Rooms;
+using LibMatrix.Responses;
+
+namespace LibMatrix.HomeserverEmulator.Services;
+
+public class RoomStore {
+    private readonly ILogger<RoomStore> _logger;
+    public ConcurrentBag<Room> _rooms = new();
+    private FrozenDictionary<string, Room> _roomsById = FrozenDictionary<string, Room>.Empty;
+
+    public RoomStore(ILogger<RoomStore> logger, HSEConfiguration config) {
+        _logger = logger;
+        if (config.StoreData) {
+            var path = Path.Combine(config.DataStoragePath, "rooms");
+            if (!Directory.Exists(path)) Directory.CreateDirectory(path);
+            foreach (var file in Directory.GetFiles(path)) {
+                var room = JsonSerializer.Deserialize<Room>(File.ReadAllText(file));
+                if (room is not null) _rooms.Add(room);
+            }
+        }
+        else
+            Console.WriteLine("Data storage is disabled, not loading rooms from disk");
+
+        RebuildIndexes();
+    }
+
+    private SemaphoreSlim a = new(1, 1);
+    private void RebuildIndexes() {
+        // a.Wait();
+        // lock (_roomsById)
+        // _roomsById = new ConcurrentDictionary<string, Room>(_rooms.ToDictionary(u => u.RoomId));
+        // foreach (var room in _rooms) {
+        //     _roomsById.AddOrUpdate(room.RoomId, room, (key, old) => room);
+        // }
+        //
+        // var roomsArr = _rooms.ToArray();
+        // foreach (var (id, room) in _roomsById) {
+        //     if (!roomsArr.Any(x => x.RoomId == id))
+        //         _roomsById.TryRemove(id, out _);
+        // }
+        
+        // _roomsById = new ConcurrentDictionary<string, Room>(_rooms.ToDictionary(u => u.RoomId));
+        _roomsById = _rooms.ToFrozenDictionary(u => u.RoomId);
+
+        // a.Release();
+    }
+
+    public Room? GetRoomById(string roomId, bool createIfNotExists = false) {
+        if (_roomsById.TryGetValue(roomId, out var room)) {
+            return room;
+        }
+
+        if (!createIfNotExists)
+            return null;
+
+        return CreateRoom(new() { });
+    }
+
+    public Room CreateRoom(CreateRoomRequest request, UserStore.User? user = null) {
+        var room = new Room(roomId: $"!{Guid.NewGuid().ToString()}");
+        var newCreateEvent = new StateEvent() {
+            Type = RoomCreateEventContent.EventId,
+            RawContent = new() { }
+        };
+
+        foreach (var (key, value) in request.CreationContent) {
+            newCreateEvent.RawContent[key] = value.DeepClone();
+        }
+
+        if (user != null) {
+            newCreateEvent.RawContent["creator"] = user.UserId;
+            var createEvent = room.SetStateInternal(newCreateEvent, user: user);
+            createEvent.Sender = user.UserId;
+
+            room.SetStateInternal(new() {
+                Type = RoomMemberEventContent.EventId,
+                StateKey = user.UserId,
+                TypedContent = new RoomMemberEventContent() {
+                    Membership = "join",
+                    AvatarUrl = (user.Profile.GetOrNull("avatar_url") as JsonObject)?.GetOrNull("avatar_url")?.GetValue<string>(),
+                    DisplayName = (user.Profile.GetOrNull("displayname") as string)
+                }
+            }, user: user);
+        }
+
+        if (!string.IsNullOrWhiteSpace(request.Name))
+            room.SetStateInternal(new StateEvent() {
+                Type = RoomNameEventContent.EventId,
+                TypedContent = new RoomNameEventContent() {
+                    Name = request.Name
+                }
+            });
+
+        if (!string.IsNullOrWhiteSpace(request.RoomAliasName))
+            room.SetStateInternal(new StateEvent() {
+                Type = RoomCanonicalAliasEventContent.EventId,
+                TypedContent = new RoomCanonicalAliasEventContent() {
+                    Alias = $"#{request.RoomAliasName}:localhost"
+                }
+            });
+
+        foreach (var stateEvent in request.InitialState ?? []) {
+            room.SetStateInternal(stateEvent);
+        }
+
+        _rooms.Add(room);
+        // _roomsById.TryAdd(room.RoomId, room);
+        RebuildIndexes();
+        return room;
+    }
+
+    public Room AddRoom(Room room) {
+        _rooms.Add(room);
+        RebuildIndexes();
+
+        return room;
+    }
+
+    public class Room : NotifyPropertyChanged {
+        private CancellationTokenSource _debounceCts = new();
+        private ObservableCollection<StateEventResponse> _timeline;
+        private ObservableDictionary<string, List<StateEventResponse>> _accountData;
+        private ObservableDictionary<string, ReadMarkersData> _readMarkers;
+        private FrozenSet<StateEventResponse> _stateCache;
+        private int _timelineHash;
+
+        public Room(string roomId) {
+            if (string.IsNullOrWhiteSpace(roomId)) throw new ArgumentException("Value cannot be null or whitespace.", nameof(roomId));
+            if (roomId[0] != '!') throw new ArgumentException("Room ID must start with !", nameof(roomId));
+            RoomId = roomId;
+            Timeline = new();
+            AccountData = new();
+            ReadMarkers = new();
+        }
+
+        public string RoomId { get; set; }
+
+        public FrozenSet<StateEventResponse> State => _timelineHash == _timeline.GetHashCode() ? _stateCache : RebuildState();
+
+        public ObservableCollection<StateEventResponse> Timeline {
+            get => _timeline;
+            set {
+                if (Equals(value, _timeline)) return;
+                _timeline = new(value);
+                _timeline.CollectionChanged += (sender, args) => {
+                    // we dont want to do this as it's rebuilt when the state is accessed
+
+                    // if (args.Action == NotifyCollectionChangedAction.Add) {
+                    //     foreach (StateEventResponse state in args.NewItems) {
+                    //         if (state.StateKey is not null)
+                    //             // we want state to be deduplicated by type and key, and we want the latest state to be the one that is returned
+                    //             RebuildState();
+                    //     }
+                    // }
+
+                    SaveDebounced();
+                };
+                // RebuildState();
+                OnPropertyChanged();
+            }
+        }
+
+        public ObservableDictionary<string, List<StateEventResponse>> AccountData {
+            get => _accountData;
+            set {
+                if (Equals(value, _accountData)) return;
+                _accountData = new(value);
+                _accountData.CollectionChanged += (sender, args) => SaveDebounced();
+                OnPropertyChanged();
+            }
+        }
+
+        public ImmutableList<StateEventResponse> JoinedMembers =>
+            State.Where(s => s is { Type: RoomMemberEventContent.EventId, TypedContent: RoomMemberEventContent { Membership: "join" } }).ToImmutableList();
+
+        public ObservableDictionary<string, ReadMarkersData> ReadMarkers {
+            get => _readMarkers;
+            set {
+                if (Equals(value, _readMarkers)) return;
+                _readMarkers = new(value);
+                _readMarkers.CollectionChanged += (sender, args) => SaveDebounced();
+                OnPropertyChanged();
+            }
+        }
+
+        internal StateEventResponse SetStateInternal(StateEvent request, string? senderId = null, UserStore.User? user = null) {
+            var state = request as StateEventResponse ?? new StateEventResponse() {
+                Type = request.Type,
+                StateKey = request.StateKey ?? "",
+                EventId = "$" + Guid.NewGuid().ToString(),
+                RoomId = RoomId,
+                OriginServerTs = DateTimeOffset.Now.ToUnixTimeMilliseconds(),
+                Sender = user?.UserId ?? senderId ?? "",
+                RawContent = request.RawContent ?? (request.TypedContent is not null
+                    ? new JsonObject()
+                    : JsonSerializer.Deserialize<JsonObject>(JsonSerializer.Serialize(request.TypedContent)))
+            };
+            Timeline.Add(state);
+            if(state.StateKey != null)
+                RebuildState();
+            return state;
+        }
+
+        public StateEventResponse AddUser(string userId) {
+            var state = SetStateInternal(new() {
+                Type = RoomMemberEventContent.EventId,
+                StateKey = userId,
+                TypedContent = new RoomMemberEventContent() {
+                    Membership = "join"
+                },
+            });
+
+            state.Sender = userId;
+            return state;
+        }
+
+        // public async Task SaveDebounced() {
+            // if (!HSEConfiguration.Current.StoreData) return;
+            // await _debounceCts.CancelAsync();
+            // _debounceCts = new CancellationTokenSource();
+            // try {
+                // await Task.Delay(250, _debounceCts.Token);
+                // // Ensure all state events are in the timeline
+                // State.Where(s => !Timeline.Contains(s)).ToList().ForEach(s => Timeline.Add(s));
+                // var path = Path.Combine(HSEConfiguration.Current.DataStoragePath, "rooms", $"{RoomId}.json");
+                // Console.WriteLine($"Saving room {RoomId} to {path}!");
+                // await File.WriteAllTextAsync(path, this.ToJson(ignoreNull: true));
+            // }
+            // catch (TaskCanceledException) { }
+        // }
+
+        private SemaphoreSlim saveSemaphore = new(1, 1);
+
+        public async Task SaveDebounced() {
+            Task.Run(async () => {
+                await saveSemaphore.WaitAsync();
+                try {
+                    var path = Path.Combine(HSEConfiguration.Current.DataStoragePath, "rooms", $"{RoomId}.json");
+                    Console.WriteLine($"Saving room {RoomId} to {path}!");
+                    await File.WriteAllTextAsync(path, this.ToJson(ignoreNull: true));
+                }
+                finally {
+                    saveSemaphore.Release();
+                }
+            });
+        }
+
+        private SemaphoreSlim stateRebuildSemaphore = new(1, 1);
+
+        private FrozenSet<StateEventResponse> RebuildState() {
+            stateRebuildSemaphore.Wait();
+            while (true)
+                try {
+                    Console.WriteLine($"Rebuilding state for room {RoomId}");
+                    // ReSharper disable once RedundantEnumerableCastCall - This sometimes happens when the collection is modified during enumeration
+                    List<StateEventResponse>? timeline = null;
+                    lock (_timeline) {
+                        timeline = Timeline.OfType<StateEventResponse>().ToList();
+                    }
+
+                    foreach (var evt in timeline) {
+                        if (evt == null) {
+                            throw new InvalidOperationException("Event is null");
+                        }
+
+                        if (evt.EventId == null) {
+                            evt.EventId = "$" + Guid.NewGuid();
+                        }
+                        else if (!evt.EventId.StartsWith('$')) {
+                            evt.EventId = "$" + evt.EventId;
+                            Console.WriteLine($"Sanitised invalid event ID {evt.EventId}");
+                        }
+                    }
+
+                    _stateCache = timeline //.Where(s => s.Type == state.Type && s.StateKey == state.StateKey)
+                        .Where(x => x.StateKey != null)
+                        .OrderByDescending(s => s.OriginServerTs)
+                        .DistinctBy(x => (x.Type, x.StateKey))
+                        .ToFrozenSet();
+
+                    _timelineHash = _timeline.GetHashCode();
+                    stateRebuildSemaphore.Release();
+                    return _stateCache;
+                }
+                finally { }
+        }
+    }
+
+    public List<StateEventResponse> GetRoomsByMember(string userId) {
+        // return _rooms
+        // // .Where(r => r.State.Any(s => s.Type == RoomMemberEventContent.EventId && s.StateKey == userId))
+        // .Select(r => (Room: r, MemberEvent: r.State.SingleOrDefault(s => s.Type == RoomMemberEventContent.EventId && s.StateKey == userId)))
+        // .Where(r => r.MemberEvent != null)
+        // .ToDictionary(x => x.Room, x => x.MemberEvent!);
+        return _rooms.SelectMany(r => r.State.Where(s => s.Type == RoomMemberEventContent.EventId && s.StateKey == userId)).ToList();
+    }
+}
\ No newline at end of file
diff --git a/Utilities/LibMatrix.HomeserverEmulator/Services/TokenService.cs b/Utilities/LibMatrix.HomeserverEmulator/Services/TokenService.cs
new file mode 100644
index 0000000..cf79aae
--- /dev/null
+++ b/Utilities/LibMatrix.HomeserverEmulator/Services/TokenService.cs
@@ -0,0 +1,29 @@
+namespace LibMatrix.HomeserverEmulator.Services;
+
+public class TokenService{
+    public string? GetAccessTokenOrNull(HttpContext ctx) {
+        //qry
+        if (ctx.Request.Query.TryGetValue("access_token", out var token)) {
+            return token;
+        }
+        //header
+        if (ctx.Request.Headers.TryGetValue("Authorization", out var auth)) {
+            var parts = auth.ToString().Split(' ');
+            if (parts is ["Bearer", _]) {
+                return parts[1];
+            }
+        }
+        return null;
+    }
+
+    public string GetAccessToken(HttpContext ctx) {
+        return GetAccessTokenOrNull(ctx) ?? throw new MatrixException() {
+            ErrorCode = MatrixException.ErrorCodes.M_UNKNOWN_TOKEN,
+            Error = "Missing token"
+        };
+    }
+
+    public string? GenerateServerName(HttpContext ctx) {
+        return ctx.Request.Host.ToString();
+    }
+}
\ No newline at end of file
diff --git a/Utilities/LibMatrix.HomeserverEmulator/Services/UserStore.cs b/Utilities/LibMatrix.HomeserverEmulator/Services/UserStore.cs
new file mode 100644
index 0000000..4ce9f92
--- /dev/null
+++ b/Utilities/LibMatrix.HomeserverEmulator/Services/UserStore.cs
@@ -0,0 +1,250 @@
+using System.Collections.Concurrent;
+using System.Collections.ObjectModel;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using ArcaneLibs;
+using ArcaneLibs.Collections;
+using ArcaneLibs.Extensions;
+using LibMatrix.EventTypes.Spec.State;
+using LibMatrix.Filters;
+using LibMatrix.Responses;
+
+namespace LibMatrix.HomeserverEmulator.Services;
+
+public class UserStore {
+    public ConcurrentBag<User> _users = new();
+    private readonly RoomStore _roomStore;
+
+    public UserStore(HSEConfiguration config, RoomStore roomStore) {
+        _roomStore = roomStore;
+        if (config.StoreData) {
+            var dataDir = Path.Combine(HSEConfiguration.Current.DataStoragePath, "users");
+            if (!Directory.Exists(dataDir)) Directory.CreateDirectory(dataDir);
+            foreach (var userId in Directory.GetDirectories(dataDir)) {
+                var tokensDir = Path.Combine(dataDir, userId, "tokens.json");
+                var path = Path.Combine(dataDir, userId, $"user.json");
+
+                var user = JsonSerializer.Deserialize<User>(File.ReadAllText(path));
+                user!.AccessTokens = JsonSerializer.Deserialize<ObservableDictionary<string, User.SessionInfo>>(File.ReadAllText(tokensDir))!;
+                _users.Add(user);
+            }
+
+            Console.WriteLine($"Loaded {_users.Count} users from disk");
+        }
+        else {
+            Console.WriteLine("Data storage is disabled, not loading users from disk");
+        }
+    }
+
+    public async Task<User?> GetUserById(string userId, bool createIfNotExists = false) {
+        if (_users.Any(x => x.UserId == userId))
+            return _users.First(x => x.UserId == userId);
+
+        if (!createIfNotExists)
+            return null;
+
+        return await CreateUser(userId);
+    }
+
+    public async Task<User?> GetUserByTokenOrNull(string token, bool createIfNotExists = false, string? serverName = null) {
+        if (_users.Any(x => x.AccessTokens.ContainsKey(token)))
+            return _users.First(x => x.AccessTokens.ContainsKey(token));
+
+        if (!createIfNotExists)
+            return null;
+        if (string.IsNullOrWhiteSpace(serverName)) throw new NullReferenceException("Server name was not passed");
+        var uid = $"@{Guid.NewGuid().ToString()}:{serverName}";
+        return await CreateUser(uid);
+    }
+
+    public async Task<User> GetUserByToken(string token, bool createIfNotExists = false, string? serverName = null) {
+        return await GetUserByTokenOrNull(token, createIfNotExists, serverName) ?? throw new MatrixException() {
+            ErrorCode = MatrixException.ErrorCodes.M_UNKNOWN_TOKEN,
+            Error = "Invalid token."
+        };
+    }
+
+    public async Task<User> CreateUser(string userId, Dictionary<string, object>? profile = null) {
+        profile ??= new();
+        if (!profile.ContainsKey("displayname")) profile.Add("displayname", userId.Split(":")[0]);
+        if (!profile.ContainsKey("avatar_url")) profile.Add("avatar_url", null);
+        var user = new User() {
+            UserId = userId,
+            AccountData = new() {
+                new StateEventResponse() {
+                    Type = "im.vector.analytics",
+                    RawContent = new JsonObject() {
+                        ["pseudonymousAnalyticsOptIn"] = false
+                    },
+                },
+                new StateEventResponse() {
+                    Type = "im.vector.web.settings",
+                    RawContent = new JsonObject() {
+                        ["developerMode"] = true
+                    }
+                },
+            }
+        };
+        user.Profile.AddRange(profile);
+        _users.Add(user);
+        if (!_roomStore._rooms.IsEmpty)
+            foreach (var item in Random.Shared.GetItems(_roomStore._rooms.ToArray(), Math.Min(_roomStore._rooms.Count, 400))) {
+                item.AddUser(userId);
+            }
+
+        int random = Random.Shared.Next(10);
+        for (int i = 0; i < random; i++) {
+            var room = _roomStore.CreateRoom(new());
+            room.AddUser(userId);
+        }
+
+        return user;
+    }
+
+    public class User : NotifyPropertyChanged {
+        public User() {
+            AccessTokens = new();
+            Filters = new();
+            Profile = new();
+            AccountData = new();
+            RoomKeys = new();
+            AuthorizedSessions = new();
+        }
+
+        private CancellationTokenSource _debounceCts = new();
+        private string _userId;
+        private ObservableDictionary<string, SessionInfo> _accessTokens;
+        private ObservableDictionary<string, SyncFilter> _filters;
+        private ObservableDictionary<string, object> _profile;
+        private ObservableCollection<StateEventResponse> _accountData;
+        private ObservableDictionary<string, RoomKeysResponse> _roomKeys;
+        private ObservableDictionary<string, AuthorizedSession> _authorizedSessions;
+
+        public string UserId {
+            get => _userId;
+            set => SetField(ref _userId, value);
+        }
+
+        public ObservableDictionary<string, SessionInfo> AccessTokens {
+            get => _accessTokens;
+            set {
+                if (value == _accessTokens) return;
+                _accessTokens = new(value);
+                _accessTokens.CollectionChanged += async (sender, args) => await SaveDebounced();
+                OnPropertyChanged();
+            }
+        }
+
+        public ObservableDictionary<string, SyncFilter> Filters {
+            get => _filters;
+            set {
+                if (value == _filters) return;
+                _filters = new(value);
+                _filters.CollectionChanged += async (sender, args) => await SaveDebounced();
+                OnPropertyChanged();
+            }
+        }
+
+        public ObservableDictionary<string, object> Profile {
+            get => _profile;
+            set {
+                if (value == _profile) return;
+                _profile = new(value);
+                _profile.CollectionChanged += async (sender, args) => await SaveDebounced();
+                OnPropertyChanged();
+            }
+        }
+
+        public ObservableCollection<StateEventResponse> AccountData {
+            get => _accountData;
+            set {
+                if (value == _accountData) return;
+                _accountData = new(value);
+                _accountData.CollectionChanged += async (sender, args) => await SaveDebounced();
+                OnPropertyChanged();
+            }
+        }
+
+        public ObservableDictionary<string, RoomKeysResponse> RoomKeys {
+            get => _roomKeys;
+            set {
+                if (value == _roomKeys) return;
+                _roomKeys = new(value);
+                _roomKeys.CollectionChanged += async (sender, args) => await SaveDebounced();
+                OnPropertyChanged();
+            }
+        }
+
+        public ObservableDictionary<string, AuthorizedSession> AuthorizedSessions {
+            get => _authorizedSessions;
+            set {
+                if (value == _authorizedSessions) return;
+                _authorizedSessions = new(value);
+                _authorizedSessions.CollectionChanged += async (sender, args) => await SaveDebounced();
+                OnPropertyChanged();
+            }
+        }
+
+        public async Task SaveDebounced() {
+            if (!HSEConfiguration.Current.StoreData) return;
+            await _debounceCts.CancelAsync();
+            _debounceCts = new CancellationTokenSource();
+            try {
+                await Task.Delay(250, _debounceCts.Token);
+                var dataDir = Path.Combine(HSEConfiguration.Current.DataStoragePath, "users", _userId);
+                if (!Directory.Exists(dataDir)) Directory.CreateDirectory(dataDir);
+                var tokensDir = Path.Combine(dataDir, "tokens.json");
+                var path = Path.Combine(dataDir, $"user.json");
+                Console.WriteLine($"Saving user {_userId} to {path}!");
+                await File.WriteAllTextAsync(path, this.ToJson(ignoreNull: true));
+                await File.WriteAllTextAsync(tokensDir, AccessTokens.ToJson(ignoreNull: true));
+            }
+            catch (TaskCanceledException) { }
+            catch (InvalidOperationException) { } // We don't care about 100% data safety, this usually happens when something is updated while serialising
+        }
+
+        public class SessionInfo {
+            public string DeviceId { get; set; } = Guid.NewGuid().ToString();
+            public Dictionary<string, UserSyncState> SyncStates { get; set; } = new();
+
+            public class UserSyncState {
+                public Dictionary<string, SyncRoomPosition> RoomPositions { get; set; } = new();
+                public string FilterId { get; set; }
+                public DateTime SyncStateCreated { get; set; } = DateTime.Now;
+
+                public class SyncRoomPosition {
+                    public int TimelinePosition { get; set; }
+                    public string LastTimelineEventId { get; set; }
+                    public int AccountDataPosition { get; set; }
+                    public bool Joined { get; set; }
+                }
+
+                public UserSyncState Clone() {
+                    return new() {
+                        FilterId = FilterId,
+                        RoomPositions = RoomPositions.ToDictionary(x => x.Key, x => new SyncRoomPosition() {
+                            TimelinePosition = x.Value.TimelinePosition,
+                            AccountDataPosition = x.Value.AccountDataPosition
+                        })
+                    };
+                }
+            }
+        }
+
+        public LoginResponse Login() {
+            var session = new SessionInfo();
+            AccessTokens.Add(Guid.NewGuid().ToString(), session);
+            SaveDebounced();
+            return new LoginResponse() {
+                AccessToken = AccessTokens.Keys.Last(),
+                DeviceId = session.DeviceId,
+                UserId = UserId
+            };
+        }
+
+        public class AuthorizedSession {
+            public string Homeserver { get; set; }
+            public string AccessToken { get; set; }
+        }
+    }
+}
\ No newline at end of file