PluralKit/PluralKit.Bot/Services/LoggerCleanService.cs

284 lines
15 KiB
C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Dapper;
using DSharpPlus;
using DSharpPlus.Entities;
using PluralKit.Core;
namespace PluralKit.Bot
{
public class LoggerCleanService
{
private static Regex _basicRegex = new Regex("(\\d{17,19})");
private static Regex _dynoRegex = new Regex("Message ID: (\\d{17,19})");
private static Regex _carlRegex = new Regex("ID: (\\d{17,19})");
private static Regex _circleRegex = new Regex("\\(`(\\d{17,19})`\\)");
private static Regex _loggerARegex = new Regex("Message = (\\d{17,19})");
private static Regex _loggerBRegex = new Regex("MessageID:(\\d{17,19})");
private static Regex _auttajaRegex = new Regex("Message (\\d{17,19}) deleted");
private static Regex _mantaroRegex = new Regex("Message \\(?ID:? (\\d{17,19})\\)? created by .* in channel .* was deleted\\.");
private static Regex _pancakeRegex = new Regex("Message from <@(\\d{17,19})> deleted in");
private static Regex _unbelievaboatRegex = new Regex("Message ID: (\\d{17,19})");
private static Regex _vanessaRegex = new Regex("Message sent by <@!?(\\d{17,19})> deleted in");
private static readonly Dictionary<ulong, LoggerBot> _bots = new[]
{
new LoggerBot("Carl-bot", 23514896210395136, fuzzyExtractFunc: ExtractCarlBot, webhookName: "Carl-bot Logging"),
new LoggerBot("Circle", 497196352866877441, fuzzyExtractFunc: ExtractCircle),
new LoggerBot("Pancake", 239631525350604801, fuzzyExtractFunc: ExtractPancake),
// There are two "Logger"s. They seem to be entirely unrelated. Don't ask.
new LoggerBot("Logger#6088", 298822483060981760 , ExtractLoggerA, webhookName: "Logger"),
new LoggerBot("Logger#6278", 327424261180620801, ExtractLoggerB),
new LoggerBot("Dyno", 155149108183695360, ExtractDyno, webhookName: "Dyno"),
new LoggerBot("Auttaja", 242730576195354624, ExtractAuttaja),
new LoggerBot("GenericBot", 295329346590343168, ExtractGenericBot),
new LoggerBot("blargbot", 134133271750639616, ExtractBlargBot),
new LoggerBot("Mantaro", 213466096718708737, ExtractMantaro),
new LoggerBot("UnbelievaBoat", 292953664492929025, ExtractUnbelievaBoat, webhookName: "UnbelievaBoat"),
new LoggerBot("Vanessa", 310261055060443136, fuzzyExtractFunc: ExtractVanessa),
}.ToDictionary(b => b.Id);
private static readonly Dictionary<string, LoggerBot> _botsByWebhookName = _bots.Values
.Where(b => b.WebhookName != null)
.ToDictionary(b => b.WebhookName);
private DbConnectionFactory _db;
private DiscordShardedClient _client;
public LoggerCleanService(DbConnectionFactory db, DiscordShardedClient client)
{
_db = db;
_client = client;
}
public ICollection<LoggerBot> Bots => _bots.Values;
public async ValueTask HandleLoggerBotCleanup(DiscordMessage msg, GuildConfig cachedGuild)
{
// Bail if not enabled, or if we don't have permission here
if (!cachedGuild.LogCleanupEnabled) return;
if (msg.Channel.Type != ChannelType.Text) return;
if (!msg.Channel.BotHasPermission(Permissions.ManageMessages)) return;
// If this message is from a *webhook*, check if the name matches one of the bots we know
// TODO: do we need to do a deeper webhook origin check, or would that be too hard on the rate limit?
// If it's from a *bot*, check the bot ID to see if we know it.
LoggerBot bot = null;
if (msg.WebhookMessage) _botsByWebhookName.TryGetValue(msg.Author.Username, out bot);
else if (msg.Author.IsBot) _bots.TryGetValue(msg.Author.Id, out bot);
// If we didn't find anything before, or what we found is an unsupported bot, bail
if (bot == null) return;
// We try two ways of extracting the actual message, depending on the bots
if (bot.FuzzyExtractFunc != null)
{
// Some bots (Carl, Circle, etc) only give us a user ID and a rough timestamp, so we try our best to
// "cross-reference" those with the message DB. We know the deletion event happens *after* the message
// was sent, so we're checking for any messages sent in the same guild within 3 seconds before the
// delete event timestamp, which is... good enough, I think? Potential for false positives and negatives
// either way but shouldn't be too much, given it's constrained by user ID and guild.
var fuzzy = bot.FuzzyExtractFunc(msg);
if (fuzzy == null) return;
using var conn = await _db.Obtain();
var mid = await conn.QuerySingleOrDefaultAsync<ulong?>(
"select mid from messages where sender = @User and mid > @ApproxID and guild = @Guild limit 1",
new
{
fuzzy.Value.User,
Guild = msg.Channel.GuildId,
ApproxId = DiscordUtils.InstantToSnowflake(fuzzy.Value.ApproxTimestamp - TimeSpan.FromSeconds(3))
});
if (mid == null) return; // If we didn't find a corresponding message, bail
// Otherwise, we can *reasonably assume* that this is a logged deletion, so delete the log message.
await msg.DeleteAsync();
}
else if (bot.ExtractFunc != null)
{
// Other bots give us the message ID itself, and we can just extract that from the database directly.
var extractedId = bot.ExtractFunc(msg);
if (extractedId == null) return; // If we didn't find anything, bail.
using var conn = await _db.Obtain();
// We do this through an inline query instead of through DataStore since we don't need all the joins it does
var mid = await conn.QuerySingleOrDefaultAsync<ulong?>("select mid from messages where original_mid = @Mid", new {Mid = extractedId.Value});
if (mid == null) return;
// If we've gotten this far, we found a logged deletion of a trigger message. Just yeet it!
await msg.DeleteAsync();
} // else should not happen, but idk, it might
}
private static ulong? ExtractAuttaja(DiscordMessage msg)
{
// Auttaja has an optional "compact mode" that logs without embeds
// That one puts the ID in the message content, non-compact puts it in the embed description.
// Regex also checks that this is a deletion.
var stringWithId = msg.Content ?? msg.Embeds.FirstOrDefault()?.Description;
if (stringWithId == null) return null;
var match = _auttajaRegex.Match(stringWithId);
return match.Success ? ulong.Parse(match.Groups[1].Value) : (ulong?) null;
}
private static ulong? ExtractDyno(DiscordMessage msg)
{
// Embed *description* contains "Message sent by [mention] deleted in [channel]", contains message ID in footer per regex
var embed = msg.Embeds.FirstOrDefault();
if (embed?.Footer == null || !(embed.Description?.Contains("deleted in") ?? false)) return null;
var match = _dynoRegex.Match(embed.Footer.Text ?? "");
return match.Success ? ulong.Parse(match.Groups[1].Value) : (ulong?) null;
}
private static ulong? ExtractLoggerA(DiscordMessage msg)
{
// This is for Logger#6088 (298822483060981760), distinct from Logger#6278 (327424261180620801).
// Embed contains title "Message deleted in [channel]", and an ID field containing both message and user ID (see regex).
var embed = msg.Embeds.FirstOrDefault();
if (embed == null) return null;
if (!embed.Description.StartsWith("Message deleted in")) return null;
var idField = embed.Fields.FirstOrDefault(f => f.Name == "ID");
if (idField.Value == null) return null; // "OrDefault" = all-null object
var match = _loggerARegex.Match(idField.Value);
return match.Success ? ulong.Parse(match.Groups[1].Value) : (ulong?) null;
}
private static ulong? ExtractLoggerB(DiscordMessage msg)
{
// This is for Logger#6278 (327424261180620801), distinct from Logger#6088 (298822483060981760).
// Embed title ends with "A Message Was Deleted!", footer contains message ID as per regex.
var embed = msg.Embeds.FirstOrDefault();
if (embed?.Footer == null || !(embed.Title?.EndsWith("A Message Was Deleted!") ?? false)) return null;
var match = _loggerBRegex.Match(embed.Footer.Text ?? "");
return match.Success ? ulong.Parse(match.Groups[1].Value) : (ulong?) null;
}
private static ulong? ExtractGenericBot(DiscordMessage msg)
{
// Embed, title is "Message Deleted", ID plain in footer.
var embed = msg.Embeds.FirstOrDefault();
if (embed?.Footer == null || !(embed.Title?.Contains("Message Deleted") ?? false)) return null;
var match = _basicRegex.Match(embed.Footer.Text ?? "");
return match.Success ? ulong.Parse(match.Groups[1].Value) : (ulong?) null;
}
private static ulong? ExtractBlargBot(DiscordMessage msg)
{
// Embed, title ends with "Message Deleted", contains ID plain in a field.
var embed = msg.Embeds.FirstOrDefault();
if (embed == null || !(embed.Title?.EndsWith("Message Deleted") ?? false)) return null;
var field = embed.Fields.FirstOrDefault(f => f.Name == "Message ID");
var match = _basicRegex.Match(field.Value ?? "");
return match.Success ? ulong.Parse(match.Groups[1].Value) : (ulong?) null;
}
private static ulong? ExtractMantaro(DiscordMessage msg)
{
// Plain message, "Message (ID: [id]) created by [user] (ID: [id]) in channel [channel] was deleted.
if (!(msg.Content?.Contains("was deleted.") ?? false)) return null;
var match = _mantaroRegex.Match(msg.Content);
return match.Success ? ulong.Parse(match.Groups[1].Value) : (ulong?) null;
}
private static FuzzyExtractResult? ExtractCarlBot(DiscordMessage msg)
{
// Embed, title is "Message deleted in [channel], **user** ID in the footer, timestamp as, well, timestamp in embed.
// This is the *deletion* timestamp, which we can assume is a couple seconds at most after the message was originally sent
var embed = msg.Embeds.FirstOrDefault();
if (embed?.Footer == null || embed.Timestamp == null || !(embed.Title?.StartsWith("Message deleted in") ?? false)) return null;
var match = _carlRegex.Match(embed.Footer.Text ?? "");
return match.Success
? new FuzzyExtractResult { User = ulong.Parse(match.Groups[1].Value), ApproxTimestamp = embed.Timestamp.Value }
: (FuzzyExtractResult?) null;
}
private static FuzzyExtractResult? ExtractCircle(DiscordMessage msg)
{
// Like Auttaja, Circle has both embed and compact modes, but the regex works for both.
// Compact: "Message from [user] ([id]) deleted in [channel]", no timestamp (use message time)
// Embed: Message Author field: "[user] ([id])", then an embed timestamp
string stringWithId = msg.Content;
if (msg.Embeds.Count > 0)
{
var embed = msg.Embeds.First();
if (embed.Author?.Name == null || !embed.Author.Name.StartsWith("Message Deleted in")) return null;
var field = embed.Fields.FirstOrDefault(f => f.Name == "Message Author");
if (field.Value == null) return null;
stringWithId = field.Value;
}
if (stringWithId == null) return null;
var match = _circleRegex.Match(stringWithId);
return match.Success
? new FuzzyExtractResult {User = ulong.Parse(match.Groups[1].Value), ApproxTimestamp = msg.Timestamp}
: (FuzzyExtractResult?) null;
}
private static FuzzyExtractResult? ExtractPancake(DiscordMessage msg)
{
// Embed, author is "Message Deleted", description includes a mention, timestamp is *message send time* (but no ID)
// so we use the message timestamp to get somewhere *after* the message was proxied
var embed = msg.Embeds.FirstOrDefault();
if (embed?.Description == null || embed.Author?.Name != "Message Deleted") return null;
var match = _pancakeRegex.Match(embed.Description);
return match.Success
? new FuzzyExtractResult {User = ulong.Parse(match.Groups[1].Value), ApproxTimestamp = msg.Timestamp}
: (FuzzyExtractResult?) null;
}
private static ulong? ExtractUnbelievaBoat(DiscordMessage msg)
{
// Embed author is "Message Deleted", footer contains message ID per regex
var embed = msg.Embeds.FirstOrDefault();
if (embed?.Footer == null || embed.Author?.Name != "Message Deleted") return null;
var match = _unbelievaboatRegex.Match(embed.Footer.Text ?? "");
return match.Success ? ulong.Parse(match.Groups[1].Value) : (ulong?) null;
}
private static FuzzyExtractResult? ExtractVanessa(DiscordMessage msg)
{
// Title is "Message Deleted", embed description contains mention
var embed = msg.Embeds.FirstOrDefault();
if (embed?.Title == null || embed.Title != "Message Deleted" || embed.Description == null) return null;
var match = _vanessaRegex.Match(embed.Description);
return match.Success
? new FuzzyExtractResult {User = ulong.Parse(match.Groups[1].Value), ApproxTimestamp = msg.Timestamp}
: (FuzzyExtractResult?) null;
}
public class LoggerBot
{
public string Name;
public ulong Id;
public Func<DiscordMessage, ulong?> ExtractFunc;
public Func<DiscordMessage, FuzzyExtractResult?> FuzzyExtractFunc;
public string WebhookName;
public LoggerBot(string name, ulong id, Func<DiscordMessage, ulong?> extractFunc = null, Func<DiscordMessage, FuzzyExtractResult?> fuzzyExtractFunc = null, string webhookName = null)
{
Name = name;
Id = id;
FuzzyExtractFunc = fuzzyExtractFunc;
ExtractFunc = extractFunc;
WebhookName = webhookName;
}
}
public struct FuzzyExtractResult
{
public ulong User;
public DateTimeOffset ApproxTimestamp;
}
}
}