362 lines
17 KiB
C#
362 lines
17 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using DSharpPlus;
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using DSharpPlus.Entities;
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using DSharpPlus.EventArgs;
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using DSharpPlus.Exceptions;
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using NodaTime;
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using PluralKit.Core;
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using Serilog;
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namespace PluralKit.Bot
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{
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class ProxyMatch {
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public PKMember Member;
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public PKSystem System;
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public ProxyTag? ProxyTags;
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public string InnerText;
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}
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public class ProxyService {
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private DiscordShardedClient _client;
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private LogChannelService _logChannel;
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private IDataStore _data;
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private EmbedService _embeds;
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private ILogger _logger;
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private WebhookExecutorService _webhookExecutor;
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public ProxyService(DiscordShardedClient client, LogChannelService logChannel, IDataStore data, EmbedService embeds, ILogger logger, WebhookExecutorService webhookExecutor)
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{
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_client = client;
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_logChannel = logChannel;
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_data = data;
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_embeds = embeds;
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_webhookExecutor = webhookExecutor;
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_logger = logger.ForContext<ProxyService>();
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}
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private ProxyMatch GetProxyTagMatch(string message, PKSystem system, IEnumerable<PKMember> potentialMembers)
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{
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// If the message starts with a @mention, and then proceeds to have proxy tags,
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// extract the mention and place it inside the inner message
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// eg. @Ske [text] => [@Ske text]
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int matchStartPosition = 0;
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string leadingMention = null;
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if (StringUtils.HasMentionPrefix(message, ref matchStartPosition, out _))
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{
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leadingMention = message.Substring(0, matchStartPosition);
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message = message.Substring(matchStartPosition);
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}
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// Flatten and sort by specificity (ProxyString length desc = prefix+suffix length desc = inner message asc = more specific proxy first!)
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var ordered = potentialMembers.SelectMany(m => m.ProxyTags.Select(tag => (tag, m))).OrderByDescending(p => p.Item1.ProxyString.Length);
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foreach (var (tag, match) in ordered)
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{
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if (tag.Prefix == null && tag.Suffix == null) continue;
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var prefix = tag.Prefix ?? "";
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var suffix = tag.Suffix ?? "";
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var isMatch = message.Length >= prefix.Length + suffix.Length
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&& message.StartsWith(prefix) && message.EndsWith(suffix);
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// Special case for image-only proxies and proxy tags with spaces
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if (!isMatch && message.Trim() == prefix.TrimEnd() + suffix.TrimStart())
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{
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isMatch = true;
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message = prefix + suffix; // To get around substring errors
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}
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if (isMatch) {
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var inner = message.Substring(prefix.Length, message.Length - prefix.Length - suffix.Length);
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if (leadingMention != null) inner = $"{leadingMention} {inner}";
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if (inner == "\U0000fe0f") return null;
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return new ProxyMatch { Member = match, System = system, InnerText = inner, ProxyTags = tag};
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}
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}
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return null;
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}
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public async Task HandleMessageAsync(DiscordClient client, GuildConfig guild, CachedAccount account, DiscordMessage message, bool doAutoProxy)
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{
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// Bail early if this isn't in a guild channel
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if (message.Channel.Guild == null) return;
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// Find a member with proxy tags matching the message
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var match = GetProxyTagMatch(message.Content, account.System, account.Members);
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// O(n) lookup since n is small (max ~100 in prod) and we're more constrained by memory (for a dictionary) here
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var systemSettingsForGuild = account.SettingsForGuild(message.Channel.GuildId);
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// If we didn't get a match by proxy tags, try to get one by autoproxy
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// Also try if we *did* get a match, but there's no inner text. This happens if someone sends a message that
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// is equal to someone else's tags, and messages like these should be autoproxied if possible
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// All of this should only be done if this call allows autoproxy.
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// When a normal message is sent, autoproxy is enabled, but if this method is called from a message *edit*
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// event, then autoproxy is disabled. This is so AP doesn't "retrigger" when the original message was escaped.
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if (doAutoProxy && (match == null || (match.InnerText.Trim().Length == 0 && message.Attachments.Count == 0)))
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match = await GetAutoproxyMatch(account, systemSettingsForGuild, message, message.Channel);
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// If we still haven't found any, just yeet
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if (match == null) return;
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// And make sure the channel's not blacklisted from proxying.
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if (guild.Blacklist.Contains(message.ChannelId)) return;
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// Make sure the system hasn't blacklisted the guild either
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if (!systemSettingsForGuild.ProxyEnabled) return;
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// We know message.Channel can only be ITextChannel as PK doesn't work in DMs/groups
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// Afterwards we ensure the bot has the right permissions, otherwise bail early
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if (!await EnsureBotPermissions(message.Channel)) return;
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// Can't proxy a message with no content and no attachment
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if (match.InnerText.Trim().Length == 0 && message.Attachments.Count == 0)
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return;
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var memberSettingsForGuild = account.SettingsForMemberGuild(match.Member.Id, message.Channel.GuildId);
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// Get variables in order and all
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var proxyName = match.Member.ProxyName(match.System.Tag, memberSettingsForGuild.DisplayName);
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var avatarUrl = memberSettingsForGuild.AvatarUrl ?? match.Member.AvatarUrl ?? match.System.AvatarUrl;
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// If the name's too long (or short), bail
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if (proxyName.Length < 2) throw Errors.ProxyNameTooShort(proxyName);
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if (proxyName.Length > Limits.MaxProxyNameLength) throw Errors.ProxyNameTooLong(proxyName);
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// Add the proxy tags into the proxied message if that option is enabled
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// Also check if the member has any proxy tags - some cases autoproxy can return a member with no tags
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var messageContents = (match.Member.KeepProxy && match.ProxyTags.HasValue)
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? $"{match.ProxyTags.Value.Prefix}{match.InnerText}{match.ProxyTags.Value.Suffix}"
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: match.InnerText;
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// Sanitize @everyone, but only if the original user wouldn't have permission to
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messageContents = await SanitizeEveryoneMaybe(message, messageContents);
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// Execute the webhook itself
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var hookMessageId = await _webhookExecutor.ExecuteWebhook(message.Channel, proxyName, avatarUrl,
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messageContents,
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message.Attachments
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);
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// Store the message in the database, and log it in the log channel (if applicable)
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await _data.AddMessage(message.Author.Id, hookMessageId, message.Channel.GuildId, message.Channel.Id, message.Id, match.Member);
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await _logChannel.LogMessage(client, match.System, match.Member, hookMessageId, message.Id, message.Channel, message.Author, match.InnerText, guild);
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// Wait a second or so before deleting the original message
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await Task.Delay(1000);
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try
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{
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await message.DeleteAsync();
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}
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catch (NotFoundException)
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{
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// If it's already deleted, we just log and swallow the exception
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_logger.Warning("Attempted to delete already deleted proxy trigger message {Message}", message.Id);
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}
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}
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private async Task<ProxyMatch> GetAutoproxyMatch(CachedAccount account, SystemGuildSettings guildSettings, DiscordMessage message, DiscordChannel channel)
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{
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// For now we use a backslash as an "escape character", subject to change later
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if ((message.Content ?? "").TrimStart().StartsWith("\\")) return null;
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PKMember member = null;
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// Figure out which member to proxy as
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switch (guildSettings.AutoproxyMode)
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{
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case AutoproxyMode.Off:
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// Autoproxy off, bail
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return null;
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case AutoproxyMode.Front:
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// Front mode: just use the current first fronter
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member = await _data.GetFirstFronter(account.System);
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break;
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case AutoproxyMode.Latch:
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// Latch mode: find last proxied message, use *that* member
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var msg = await _data.GetLastMessageInGuild(message.Author.Id, channel.GuildId);
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if (msg == null) return null; // No message found
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// If the message is older than 6 hours, ignore it and force the sender to "refresh" a proxy
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// This can be revised in the future, it's a preliminary value.
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var timestamp = DiscordUtils.SnowflakeToInstant(msg.Message.Mid);
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var timeSince = SystemClock.Instance.GetCurrentInstant() - timestamp;
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if (timeSince > Duration.FromHours(6)) return null;
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member = msg.Member;
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break;
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case AutoproxyMode.Member:
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// Member mode: just use that member
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// O(n) lookup since n is small (max 1000 de jure) and we're more constrained by memory (for a dictionary) here
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member = account.Members.FirstOrDefault(m => m.Id == guildSettings.AutoproxyMember);
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break;
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}
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// If we haven't found the member (eg. front mode w/ no fronter), bail again
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if (member == null) return null;
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return new ProxyMatch
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{
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System = account.System,
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Member = member,
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// Autoproxying members with no proxy tags is possible, return the correct result
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ProxyTags = member.ProxyTags.Count > 0 ? member.ProxyTags.First() : (ProxyTag?) null,
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InnerText = message.Content
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};
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}
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private static async Task<string> SanitizeEveryoneMaybe(DiscordMessage message,
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string messageContents)
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{
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var permissions = await message.Channel.PermissionsIn(message.Author);
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return (permissions & Permissions.MentionEveryone) == 0 ? messageContents.SanitizeEveryone() : messageContents;
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}
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private async Task<bool> EnsureBotPermissions(DiscordChannel channel)
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{
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var permissions = channel.BotPermissions();
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// If we can't send messages at all, just bail immediately.
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// 2020-04-22: Manage Messages does *not* override a lack of Send Messages.
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if ((permissions & Permissions.SendMessages) == 0) return false;
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if ((permissions & Permissions.ManageWebhooks) == 0)
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{
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// todo: PKError-ify these
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await channel.SendMessageAsync(
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$"{Emojis.Error} PluralKit does not have the *Manage Webhooks* permission in this channel, and thus cannot proxy messages. Please contact a server administrator to remedy this.");
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return false;
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}
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if ((permissions & Permissions.ManageMessages) == 0)
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{
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await channel.SendMessageAsync(
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$"{Emojis.Error} PluralKit does not have the *Manage Messages* permission in this channel, and thus cannot delete the original trigger message. Please contact a server administrator to remedy this.");
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return false;
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}
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return true;
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}
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public Task HandleReactionAddedAsync(MessageReactionAddEventArgs args)
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{
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// Dispatch on emoji
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switch (args.Emoji.Name)
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{
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case "\u274C": // Red X
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return HandleMessageDeletionByReaction(args);
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case "\u2753": // Red question mark
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case "\u2754": // White question mark
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return HandleMessageQueryByReaction(args);
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case "\U0001F514": // Bell
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case "\U0001F6CE": // Bellhop bell
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case "\U0001F3D3": // Ping pong paddle (lol)
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case "\u23F0": // Alarm clock
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case "\u2757": // Exclamation mark
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return HandleMessagePingByReaction(args);
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default:
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return Task.CompletedTask;
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}
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}
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private async Task HandleMessagePingByReaction(MessageReactionAddEventArgs args)
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{
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// Bail in DMs or if we don't have send permission
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if (args.Channel.Type != ChannelType.Text) return;
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if (!args.Channel.BotHasAllPermissions(Permissions.SendMessages)) return;
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// Find the message in the DB
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var msg = await _data.GetMessage(args.Message.Id);
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if (msg == null) return;
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// Check if the pinger has permission to ping in this channel
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var guildUser = await args.Guild.GetMemberAsync(args.User.Id);
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var permissions = guildUser.PermissionsIn(args.Channel);
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// If they don't have Send Messages permission, bail (since PK shouldn't send anything on their behalf)
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var requiredPerms = Permissions.AccessChannels | Permissions.SendMessages;
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if ((permissions & requiredPerms) != requiredPerms) return;
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var embed = new DiscordEmbedBuilder().WithDescription($"[Jump to pinged message]({args.Message.JumpLink})");
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await args.Channel.SendMessageAsync($"Psst, **{msg.Member.DisplayName ?? msg.Member.Name}** (<@{msg.Message.Sender}>), you have been pinged by <@{args.User.Id}>.", embed: embed.Build());
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// Finally remove the original reaction (if we can)
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if (args.Channel.BotHasAllPermissions(Permissions.ManageMessages))
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await args.Message.DeleteReactionAsync(args.Emoji, args.User);
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}
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private async Task HandleMessageQueryByReaction(MessageReactionAddEventArgs args)
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{
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// Bail if not in guild
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if (args.Guild == null) return;
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// Find the message in the DB
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var msg = await _data.GetMessage(args.Message.Id);
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if (msg == null) return;
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// Get guild member so we can DM
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var member = await args.Guild.GetMemberAsync(args.User.Id);
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// DM them the message card
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try
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{
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await member.SendMessageAsync(embed: await _embeds.CreateMemberEmbed(msg.System, msg.Member, args.Guild, LookupContext.ByNonOwner));
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await member.SendMessageAsync(embed: await _embeds.CreateMessageInfoEmbed(args.Client, msg));
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}
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catch (UnauthorizedException)
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{
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// Ignore exception if it means we don't have DM permission to this user
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// not much else we can do here :/
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}
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// And finally remove the original reaction (if we can)
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await args.Message.DeleteReactionAsync(args.Emoji, args.User);
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}
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public async Task HandleMessageDeletionByReaction(MessageReactionAddEventArgs args)
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{
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// Bail if we don't have permission to delete
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if (!args.Channel.BotHasAllPermissions(Permissions.ManageMessages)) return;
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// Find the message in the database
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var storedMessage = await _data.GetMessage(args.Message.Id);
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if (storedMessage == null) return; // (if we can't, that's ok, no worries)
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// Make sure it's the actual sender of that message deleting the message
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if (storedMessage.Message.Sender != args.User.Id) return;
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try
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{
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await args.Message.DeleteAsync();
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} catch (NullReferenceException) {
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// Message was deleted before we got to it... cool, no problem, lmao
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}
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// Finally, delete it from our database.
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await _data.DeleteMessage(args.Message.Id);
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}
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public async Task HandleMessageDeletedAsync(MessageDeleteEventArgs args)
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{
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// Don't delete messages from the store if they aren't webhooks
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// Non-webhook messages will never be stored anyway.
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// If we're not sure (eg. message outside of cache), delete just to be sure.
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if (!args.Message.WebhookMessage) return;
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await _data.DeleteMessage(args.Message.Id);
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}
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public async Task HandleMessageBulkDeleteAsync(MessageBulkDeleteEventArgs args)
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{
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_logger.Information("Bulk deleting {Count} messages in channel {Channel}", args.Messages.Count, args.Channel.Id);
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await _data.DeleteMessagesBulk(args.Messages.Select(m => m.Id).ToList());
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}
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}
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} |