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using System.Buffers.Text;
using System.Security.Cryptography;
using ArcaneLibs.Extensions;
using LibMatrix;
using LibMatrix.EventTypes.Spec;
using LibMatrix.Helpers;
using LibMatrix.Services;
using LibMatrix.Utilities.Bot.Interfaces;
using ModerationBot.AccountData;
using ModerationBot.StateEventTypes;
using ModerationBot.StateEventTypes.Policies.Implementations;
namespace ModerationBot.Commands;
public class BanMediaCommand(IServiceProvider services, HomeserverProviderService hsProvider, HomeserverResolverService hsResolver, PolicyEngine engine) : ICommand {
public string Name { get; } = "banmedia";
public string Description { get; } = "Create a policy banning a piece of media, must be used in reply to a message";
public async Task<bool> CanInvoke(CommandContext ctx) {
//check if user is admin in control room
var botData = await ctx.Homeserver.GetAccountDataAsync<BotData>("gay.rory.moderation_bot_data");
var controlRoom = ctx.Homeserver.GetRoom(botData.ControlRoom);
var isAdmin = (await controlRoom.GetPowerLevelsAsync())!.UserHasStatePermission(ctx.MessageEvent.Sender, "m.room.ban");
if (!isAdmin) {
// await ctx.Reply("You do not have permission to use this command!");
await ctx.Homeserver.GetRoom(botData.LogRoom!).SendMessageEventAsync(
new RoomMessageEventContent(body: $"User {ctx.MessageEvent.Sender} tried to use command {Name} but does not have permission!", messageType: "m.text"));
}
return isAdmin;
}
public async Task Invoke(CommandContext ctx) {
var botData = await ctx.Homeserver.GetAccountDataAsync<BotData>("gay.rory.moderation_bot_data");
var policyRoom = ctx.Homeserver.GetRoom(botData.DefaultPolicyRoom ?? botData.ControlRoom);
var logRoom = ctx.Homeserver.GetRoom(botData.LogRoom ?? botData.ControlRoom);
//check if reply
var messageContent = ctx.MessageEvent.TypedContent as RoomMessageEventContent;
if (messageContent?.RelatesTo is { InReplyTo: not null }) {
try {
await logRoom.SendMessageEventAsync(
new RoomMessageEventContent(
body: $"User {MessageFormatter.HtmlFormatMention(ctx.MessageEvent.Sender)} is trying to ban media {messageContent!.RelatesTo!.InReplyTo!.EventId}",
messageType: "m.text"));
//get replied message
var repliedMessage = await ctx.Room.GetEventAsync<StateEventResponse>(messageContent.RelatesTo!.InReplyTo!.EventId);
//check if recommendation is in list
if (ctx.Args.Length < 2) {
await ctx.Room.SendMessageEventAsync(MessageFormatter.FormatError("You must specify a recommendation type and reason!"));
return;
}
var recommendation = ctx.Args[0];
if (recommendation is not ("ban" or "kick" or "mute" or "redact" or "spoiler" or "warn" or "warn_admins")) {
await ctx.Room.SendMessageEventAsync(
MessageFormatter.FormatError(
$"Invalid recommendation type {recommendation}, must be `warn_admins`, `warn`, `spoiler`, `redact`, `mute`, `kick` or `ban`!"));
return;
}
//hash file
var mxcUri = (repliedMessage.TypedContent as RoomMessageEventContent).Url!;
var resolvedUri = await hsResolver.ResolveMediaUri(mxcUri.Split('/')[2], mxcUri);
var hashAlgo = SHA3_256.Create();
var uriHash = hashAlgo.ComputeHash(mxcUri.AsBytes().ToArray());
byte[]? fileHash = null;
try {
fileHash = await hashAlgo.ComputeHashAsync(await ctx.Homeserver.ClientHttpClient.GetStreamAsync(resolvedUri));
}
catch (Exception ex) {
await logRoom.SendMessageEventAsync(
MessageFormatter.FormatException($"Error calculating file hash for {mxcUri} via {mxcUri.Split('/')[2]}, retrying via {ctx.Homeserver.BaseUrl}...",
ex));
try {
resolvedUri = await hsResolver.ResolveMediaUri(ctx.Homeserver.BaseUrl, mxcUri);
fileHash = await hashAlgo.ComputeHashAsync(await ctx.Homeserver.ClientHttpClient.GetStreamAsync(resolvedUri));
}
catch (Exception ex2) {
await ctx.Room.SendMessageEventAsync(MessageFormatter.FormatException("Error calculating file hash", ex2));
await logRoom.SendMessageEventAsync(
MessageFormatter.FormatException($"Error calculating file hash via {ctx.Homeserver.BaseUrl}!", ex2));
}
}
MediaPolicyFile policy;
await policyRoom.SendStateEventAsync("gay.rory.moderation.rule.media", Guid.NewGuid().ToString(), policy = new MediaPolicyFile {
Entity = Convert.ToBase64String(uriHash),
FileHash = Convert.ToBase64String(fileHash),
Reason = string.Join(' ', ctx.Args[1..]),
Recommendation = recommendation,
});
await ctx.Room.SendMessageEventAsync(MessageFormatter.FormatSuccessJson("Media policy created", policy));
await logRoom.SendMessageEventAsync(MessageFormatter.FormatSuccessJson("Media policy created", policy));
}
catch (Exception e) {
await logRoom.SendMessageEventAsync(MessageFormatter.FormatException("Error creating policy", e));
await ctx.Room.SendMessageEventAsync(MessageFormatter.FormatException("Error creating policy", e));
await using var stream = new MemoryStream(e.ToString().AsBytes().ToArray());
await logRoom.SendFileAsync("error.log.cs", stream);
}
}
else {
await ctx.Room.SendMessageEventAsync(MessageFormatter.FormatError("This command must be used in reply to a message!"));
}
}
}
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