diff --git a/ExampleBots/MediaModeratorPoC/MediaModBot.cs b/ExampleBots/MediaModeratorPoC/MediaModBot.cs
new file mode 100644
index 0000000..0aacf61
--- /dev/null
+++ b/ExampleBots/MediaModeratorPoC/MediaModBot.cs
@@ -0,0 +1,339 @@
+using System.Security.Cryptography;
+using System.Text.RegularExpressions;
+using ArcaneLibs.Extensions;
+using LibMatrix;
+using LibMatrix.EventTypes.Spec;
+using LibMatrix.EventTypes.Spec.State;
+using LibMatrix.Helpers;
+using LibMatrix.Homeservers;
+using LibMatrix.Responses;
+using LibMatrix.RoomTypes;
+using LibMatrix.Services;
+using LibMatrix.Utilities.Bot.Interfaces;
+using MediaModeratorPoC.AccountData;
+using MediaModeratorPoC.StateEventTypes;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace MediaModeratorPoC;
+
+public class MediaModBot(AuthenticatedHomeserverGeneric hs, ILogger<MediaModBot> logger, MediaModBotConfiguration configuration,
+ HomeserverResolverService hsResolver) : IHostedService {
+ private readonly IEnumerable<ICommand> _commands;
+
+ private Task _listenerTask;
+
+ private GenericRoom _policyRoom;
+ private GenericRoom _logRoom;
+ private GenericRoom _controlRoom;
+
+
+
+ /// <summary>Triggered when the application host is ready to start the service.</summary>
+ /// <param name="cancellationToken">Indicates that the start process has been aborted.</param>
+ public async Task StartAsync(CancellationToken cancellationToken) {
+ _listenerTask = Run(cancellationToken);
+ logger.LogInformation("Bot started!");
+ }
+
+ private async Task Run(CancellationToken cancellationToken) {
+ Directory.GetFiles("bot_data/cache").ToList().ForEach(File.Delete);
+
+ BotData botData;
+
+ try {
+ botData = await hs.GetAccountDataAsync<BotData>("gay.rory.modbot_data");
+ }
+ catch (Exception e) {
+ if (e is not MatrixException { ErrorCode: "M_NOT_FOUND" }) {
+ logger.LogError("{}", e.ToString());
+ throw;
+ }
+
+ botData = new BotData();
+ var creationContent = CreateRoomRequest.CreatePrivate(hs, name: "Media Moderator PoC - Control room", roomAliasName: "media-moderator-poc-control-room");
+ creationContent.Invite = configuration.Admins;
+ creationContent.CreationContent["type"] = "gay.rory.media_moderator_poc.control_room";
+
+ botData.ControlRoom = (await hs.CreateRoom(creationContent)).RoomId;
+
+ //set access rules to allow joining via control room
+ creationContent.InitialState.Add(new StateEvent {
+ Type = "m.room.join_rules",
+ StateKey = "",
+ TypedContent = new RoomJoinRulesEventContent {
+ JoinRule = "knock_restricted",
+ Allow = new() {
+ new RoomJoinRulesEventContent.AllowEntry {
+ Type = "m.room_membership",
+ RoomId = botData.ControlRoom
+ }
+ }
+ }
+ });
+
+ creationContent.Name = "Media Moderator PoC - Log room";
+ creationContent.RoomAliasName = "media-moderator-poc-log-room";
+ creationContent.CreationContent["type"] = "gay.rory.media_moderator_poc.log_room";
+ botData.LogRoom = (await hs.CreateRoom(creationContent)).RoomId;
+
+ creationContent.Name = "Media Moderator PoC - Policy room";
+ creationContent.RoomAliasName = "media-moderator-poc-policy-room";
+ creationContent.CreationContent["type"] = "gay.rory.media_moderator_poc.policy_room";
+ botData.PolicyRoom = (await hs.CreateRoom(creationContent)).RoomId;
+
+ await hs.SetAccountData("gay.rory.modbot_data", botData);
+ }
+
+ _policyRoom = hs.GetRoom(botData.PolicyRoom ?? botData.ControlRoom);
+ _logRoom = hs.GetRoom(botData.LogRoom ?? botData.ControlRoom);
+ _controlRoom = hs.GetRoom(botData.ControlRoom);
+ var syncHelper = new SyncHelper(hs);
+
+ List<string> admins = new();
+
+#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+ Task.Run(async () => {
+ while (!cancellationToken.IsCancellationRequested) {
+ var controlRoomMembers = _controlRoom.GetMembersAsync();
+ await foreach (var member in controlRoomMembers) {
+ if ((member.TypedContent as RoomMemberEventContent)?
+
+ .Membership == "join") admins.Add(member.UserId);
+ }
+
+ await Task.Delay(TimeSpan.FromSeconds(30), cancellationToken);
+ }
+ }, cancellationToken);
+#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+
+ syncHelper.InviteReceivedHandlers.Add(async Task (args) => {
+ var inviteEvent =
+ args.Value.InviteState.Events.FirstOrDefault(x =>
+ x.Type == "m.room.member" && x.StateKey == hs.UserId);
+ logger.LogInformation("Got invite to {RoomId} by {Sender} with reason: {Reason}", args.Key, inviteEvent!.Sender, (inviteEvent.TypedContent as RoomMemberEventContent)!.Reason);
+ if (inviteEvent.Sender.EndsWith(":rory.gay") || inviteEvent!.Sender.EndsWith(":conduit.rory.gay")) {
+ try {
+ var senderProfile = await hs.GetProfileAsync(inviteEvent.Sender);
+ await hs.GetRoom(args.Key).JoinAsync(reason: $"I was invited by {senderProfile.DisplayName ?? inviteEvent.Sender}!");
+ }
+ catch (Exception e) {
+ logger.LogError("{}", e.ToString());
+ await hs.GetRoom(args.Key).LeaveAsync(reason: "I was unable to join the room: " + e);
+ }
+ }
+ });
+
+ syncHelper.TimelineEventHandlers.Add(async @event => {
+ var room = hs.GetRoom(@event.RoomId);
+ try {
+ logger.LogInformation(
+ "Got timeline event in {}: {}", @event.RoomId, @event.ToJson(indent: true, ignoreNull: true));
+
+ if (@event is { Type: "m.room.message", TypedContent: RoomMessageEventContent message }) {
+ if (message is { MessageType: "m.image" }) {
+ //check media
+ var matchedPolicy = await CheckMedia(@event);
+ if (matchedPolicy is null) return;
+ var matchedpolicyData = matchedPolicy.TypedContent as MediaPolicyEventContent;
+ var recommendation = matchedpolicyData.Recommendation;
+ await _logRoom.SendMessageEventAsync(
+ new RoomMessageEventContent(
+ body:
+ $"User {MessageFormatter.HtmlFormatMention(@event.Sender)} posted an image in {MessageFormatter.HtmlFormatMention(room.RoomId)} that matched rule {matchedPolicy.StateKey}, applying action {matchedpolicyData.Recommendation}, as described in rule: {matchedPolicy.RawContent!.ToJson(ignoreNull: true)}",
+ messageType: "m.text") {
+ Format = "org.matrix.custom.html",
+ FormattedBody =
+ $"<font color=\"#FFFF00\">User {MessageFormatter.HtmlFormatMention(@event.Sender)} posted an image in {MessageFormatter.HtmlFormatMention(room.RoomId)} that matched rule {matchedPolicy.StateKey}, applying action {matchedpolicyData.Recommendation}, as described in rule: <pre>{matchedPolicy.RawContent!.ToJson(ignoreNull: true)}</pre></font>"
+ });
+ switch (recommendation) {
+ case "warn_admins": {
+ await _controlRoom.SendMessageEventAsync(
+ new RoomMessageEventContent(
+ body: $"{string.Join(' ', admins)}\nUser {MessageFormatter.HtmlFormatMention(@event.Sender)} posted a banned image {message.Url}",
+ messageType: "m.text") {
+ Format = "org.matrix.custom.html",
+ FormattedBody = $"{string.Join(' ', admins.Select(u => MessageFormatter.HtmlFormatMention(u)))}\n" +
+ $"<font color=\"#FF0000\">User {MessageFormatter.HtmlFormatMention(@event.Sender)} posted a banned image <a href=\"{message.Url}\">{message.Url}</a></font>"
+ });
+ break;
+ }
+ case "warn": {
+ await room.SendMessageEventAsync(
+ new RoomMessageEventContent(
+ body: $"Please be careful when posting this image: {matchedpolicyData.Reason ?? "No reason specified"}",
+ messageType: "m.text") {
+ Format = "org.matrix.custom.html",
+ FormattedBody =
+ $"<font color=\"#FFFF00\">Please be careful when posting this image: {matchedpolicyData.Reason ?? "No reason specified"}</a></font>"
+ });
+ break;
+ }
+ case "redact": {
+ await room.RedactEventAsync(@event.EventId, matchedpolicyData.Reason ?? "No reason specified");
+ break;
+ }
+ case "spoiler": {
+ // <blockquote>
+ // <a href=\"https://matrix.to/#/@emma:rory.gay\">@emma:rory.gay</a><br>
+ // <a href=\"https://codeberg.org/crimsonfork/CN\"></a>
+ // <font color=\"#dc143c\" data-mx-color=\"#dc143c\">
+ // <b>CN</b>
+ // </font>:
+ // <a href=\"https://the-apothecary.club/_matrix/media/v3/download/rory.gay/sLkdxUhipiQaFwRkXcPSRwdg\">test</a><br>
+ // <span data-mx-spoiler=\"\"><a href=\"https://the-apothecary.club/_matrix/media/v3/download/rory.gay/sLkdxUhipiQaFwRkXcPSRwdg\">
+ // <img src=\"mxc://rory.gay/sLkdxUhipiQaFwRkXcPSRwdg\" height=\"69\"></a>
+ // </span>
+ // </blockquote>
+ await room.SendMessageEventAsync(
+ new RoomMessageEventContent(
+ body:
+ $"Please be careful when posting this image: {matchedpolicyData.Reason}, I have spoilered it for you:",
+ messageType: "m.text") {
+ Format = "org.matrix.custom.html",
+ FormattedBody =
+ $"<font color=\"#FFFF00\">Please be careful when posting this image: {matchedpolicyData.Reason}, I have spoilered it for you:</a></font>"
+ });
+ var imageUrl = message.Url;
+ await room.SendMessageEventAsync(
+ new RoomMessageEventContent(body: $"CN: {imageUrl}",
+ messageType: "m.text") {
+ Format = "org.matrix.custom.html",
+ FormattedBody = $"""
+ <blockquote>
+ <font color=\"#dc143c\" data-mx-color=\"#dc143c\">
+ <b>CN</b>
+ </font>:
+ <a href=\"{imageUrl}\">{matchedpolicyData.Reason}</a><br>
+ <span data-mx-spoiler=\"\">
+ <a href=\"{imageUrl}\">
+ <img src=\"{imageUrl}\" height=\"69\">
+ </a>
+ </span>
+ </blockquote>
+ """
+ });
+ await room.RedactEventAsync(@event.EventId, "Automatically spoilered: " + matchedpolicyData.Reason);
+ break;
+ }
+ case "mute": {
+ await room.RedactEventAsync(@event.EventId, matchedpolicyData.Reason);
+ //change powerlevel to -1
+ var currentPls = await room.GetPowerLevelsAsync();
+ if(currentPls is null) {
+ logger.LogWarning("Unable to get power levels for {room}", room.RoomId);
+ await _logRoom.SendMessageEventAsync(
+ MessageFormatter.FormatError($"Unable to get power levels for {MessageFormatter.HtmlFormatMention(room.RoomId)}"));
+ return;
+ }
+ currentPls.Users ??= new();
+ currentPls.Users[@event.Sender] = -1;
+ await room.SendStateEventAsync("m.room.power_levels", currentPls);
+ break;
+ }
+ case "kick": {
+ await room.RedactEventAsync(@event.EventId, matchedpolicyData.Reason);
+ await room.KickAsync(@event.Sender, matchedpolicyData.Reason);
+ break;
+ }
+ case "ban": {
+ await room.RedactEventAsync(@event.EventId, matchedpolicyData.Reason);
+ await room.BanAsync(@event.Sender, matchedpolicyData.Reason);
+ break;
+ }
+ default: {
+ throw new ArgumentOutOfRangeException("recommendation",
+ $"Unknown response type {matchedpolicyData.Recommendation}!");
+ }
+ }
+ }
+ }
+ }
+ catch (Exception e) {
+ logger.LogError("{}", e.ToString());
+ await _controlRoom.SendMessageEventAsync(
+ MessageFormatter.FormatException($"Unable to ban user in {MessageFormatter.HtmlFormatMention(room.RoomId)}", e));
+ await _logRoom.SendMessageEventAsync(
+ MessageFormatter.FormatException($"Unable to ban user in {MessageFormatter.HtmlFormatMention(room.RoomId)}", e));
+ await using var stream = new MemoryStream(e.ToString().AsBytes().ToArray());
+ await _controlRoom.SendFileAsync("error.log.cs", stream);
+ await _logRoom.SendFileAsync("error.log.cs", stream);
+ }
+ });
+ }
+
+ /// <summary>Triggered when the application host is performing a graceful shutdown.</summary>
+ /// <param name="cancellationToken">Indicates that the shutdown process should no longer be graceful.</param>
+ public async Task StopAsync(CancellationToken cancellationToken) {
+ logger.LogInformation("Shutting down bot!");
+ }
+
+ private async Task<StateEventResponse?> CheckMedia(StateEventResponse @event) {
+ var stateList = _policyRoom.GetFullStateAsync();
+ var hashAlgo = SHA3_256.Create();
+
+ var mxcUri = @event.RawContent["url"].GetValue<string>();
+ var resolvedUri = await hsResolver.ResolveMediaUri(mxcUri.Split('/')[2], mxcUri);
+ var uriHash = hashAlgo.ComputeHash(mxcUri.AsBytes().ToArray());
+ byte[]? fileHash = null;
+
+ try {
+ fileHash = await hashAlgo.ComputeHashAsync(await hs._httpClient.GetStreamAsync(resolvedUri));
+ }
+ catch (Exception ex) {
+ await _logRoom.SendMessageEventAsync(
+ MessageFormatter.FormatException($"Error calculating file hash for {mxcUri} via {mxcUri.Split('/')[2]} ({resolvedUri}), retrying via {hs.BaseUrl}...",
+ ex));
+ try {
+ resolvedUri = await hsResolver.ResolveMediaUri(hs.BaseUrl, mxcUri);
+ fileHash = await hashAlgo.ComputeHashAsync(await hs._httpClient.GetStreamAsync(resolvedUri));
+ }
+ catch (Exception ex2) {
+ await _logRoom.SendMessageEventAsync(
+ MessageFormatter.FormatException($"Error calculating file hash via {hs.BaseUrl} ({resolvedUri})!", ex2));
+ }
+ }
+
+ logger.LogInformation("Checking media {url} with hash {hash}", resolvedUri, fileHash);
+
+ await foreach (var state in stateList) {
+ if (state.Type != "gay.rory.media_moderator_poc.rule.media" && state.Type != "gay.rory.media_moderator_poc.rule.server") continue;
+ if (!state.RawContent.ContainsKey("entity")) {
+ logger.LogWarning("Rule {rule} has no entity, this event was probably redacted!", state.StateKey);
+ continue;
+ }
+
+ logger.LogInformation("Checking rule {rule}: {data}", state.StateKey, state.TypedContent.ToJson(ignoreNull: true, indent: false));
+ var rule = state.TypedContent as MediaPolicyEventContent;
+ if (state.Type == "gay.rory.media_moderator_poc.rule.server" && rule.ServerEntity is not null) {
+ rule.ServerEntity = rule.ServerEntity.Replace("\\*", ".*").Replace("\\?", ".");
+ var regex = new Regex($"mxc://({rule.ServerEntity})/.*", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+ if (regex.IsMatch(@event.RawContent["url"]!.GetValue<string>())) {
+ logger.LogInformation("{url} matched rule {rule}", @event.RawContent["url"], rule.ToJson(ignoreNull: true));
+ return state;
+ }
+ }
+
+ if (rule.Entity is not null && uriHash.SequenceEqual(rule.Entity)) {
+ logger.LogInformation("{url} matched rule {rule} by uri hash", @event.RawContent["url"], rule.ToJson(ignoreNull: true));
+ return state;
+ }
+
+ logger.LogInformation("uri hash {uriHash} did not match rule's {ruleUriHash}", Convert.ToBase64String(uriHash), Convert.ToBase64String(rule.Entity));
+
+ if (rule.FileHash is not null && fileHash is not null && rule.FileHash.SequenceEqual(fileHash)) {
+ logger.LogInformation("{url} matched rule {rule} by file hash", @event.RawContent["url"], rule.ToJson(ignoreNull: true));
+ return state;
+ }
+
+ logger.LogInformation("file hash {fileHash} did not match rule's {ruleFileHash}", Convert.ToBase64String(fileHash), Convert.ToBase64String(rule.FileHash));
+
+ //check pixels every 10% of the way through the image using ImageSharp
+ // var image = Image.Load(await _hs._httpClient.GetStreamAsync(resolvedUri));
+ }
+
+ logger.LogInformation("{url} did not match any rules", @event.RawContent["url"]);
+
+ return null;
+ }
+}
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