private static async void SpoofingCheck(CommandContext ctx)
{
if (!CheckLock.Wait(0))
{
await ctx.Channel.SendMessageAsync("Another check is already in progress").ConfigureAwait(false);
return;
}
try
{
await ctx.ReactWithAsync(Config.Reactions.PleaseWait).ConfigureAwait(false);
var members = GetMembers(ctx.Client);
if (members.Count < 2)
{
return;
}
var result = new StringBuilder("List of potential impersonators → victims:").AppendLine();
var headerLength = result.Length;
var checkedMembers = new List <DiscordMember>(members.Count)
{
members[0]
};
for (var i = 1; i < members.Count; i++)
{
var member = members[i];
var victims = UsernameSpoofMonitor.GetPotentialVictims(ctx.Client, member, true, true, checkedMembers);
if (victims.Any())
{
result.Append(member.GetMentionWithNickname()).Append(" → ").AppendLine(string.Join(", ", victims.Select(m => m.GetMentionWithNickname())));
}
checkedMembers.Add(member);
}
await using var compressedStream = Config.MemoryStreamManager.GetStream();
await using var uncompressedStream = Config.MemoryStreamManager.GetStream();
await using (var writer = new StreamWriter(uncompressedStream, new UTF8Encoding(false), 4096, true))
{
await writer.WriteAsync(result.ToString()).ConfigureAwait(false);
await writer.FlushAsync().ConfigureAwait(false);
}
uncompressedStream.Seek(0, SeekOrigin.Begin);
if (result.Length <= headerLength)
{
await ctx.Channel.SendMessageAsync("No potential name spoofing was detected").ConfigureAwait(false);
return;
}
if (uncompressedStream.Length <= Config.AttachmentSizeLimit)
{
await ctx.Channel.SendMessageAsync(new DiscordMessageBuilder().WithFile("spoofing_check_results.txt", uncompressedStream)).ConfigureAwait(false);
return;
}
await using (var gzip = new GZipStream(compressedStream, CompressionLevel.Optimal, true))
{
await uncompressedStream.CopyToAsync(gzip).ConfigureAwait(false);
gzip.Flush();
}
compressedStream.Seek(0, SeekOrigin.Begin);
if (compressedStream.Length <= Config.AttachmentSizeLimit)
{
await ctx.Channel.SendMessageAsync(new DiscordMessageBuilder().WithFile("spoofing_check_results.txt.gz", compressedStream)).ConfigureAwait(false);
}
else
{
await ctx.Channel.SendMessageAsync($"Dump is too large: {compressedStream.Length} bytes").ConfigureAwait(false);
}
}
catch (Exception e)
{
Config.Log.Error(e);
//should be extra careful, as async void will run on a thread pull, and will terminate the whole application with an uncaught exception
try { await ctx.ReactWithAsync(Config.Reactions.Failure, "(X_X)").ConfigureAwait(false); } catch { }
}
finally
{
CheckLock.Release();
await ctx.RemoveReactionAsync(Config.Reactions.PleaseWait).ConfigureAwait(false);
}
}
