227 lines
9.4 KiB
C#
227 lines
9.4 KiB
C#
using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using Humanizer;
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using Myriad.Builders;
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using Myriad.Cache;
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using Myriad.Extensions;
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using Myriad.Rest;
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using Myriad.Rest.Exceptions;
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using Myriad.Types;
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using PluralKit.Core;
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namespace PluralKit.Bot
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{
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public class Checks
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{
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private readonly DiscordApiClient _rest;
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private readonly Bot _bot;
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private readonly IDiscordCache _cache;
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private readonly IDatabase _db;
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private readonly ModelRepository _repo;
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private readonly BotConfig _botConfig;
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private readonly ProxyService _proxy;
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private readonly ProxyMatcher _matcher;
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public Checks(DiscordApiClient rest, Bot bot, IDiscordCache cache, IDatabase db, ModelRepository repo,
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BotConfig botConfig, ProxyService proxy, ProxyMatcher matcher)
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{
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_rest = rest;
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_bot = bot;
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_cache = cache;
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_db = db;
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_repo = repo;
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_botConfig = botConfig;
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_proxy = proxy;
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_matcher = matcher;
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}
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public async Task PermCheckGuild(Context ctx)
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{
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Guild guild;
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GuildMemberPartial senderGuildUser = null;
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if (ctx.Guild != null && !ctx.HasNext())
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{
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guild = ctx.Guild;
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senderGuildUser = ctx.Member;
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}
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else
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{
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var guildIdStr = ctx.RemainderOrNull() ?? throw new PKSyntaxError("You must pass a server ID or run this command in a server.");
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if (!ulong.TryParse(guildIdStr, out var guildId))
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throw new PKSyntaxError($"Could not parse {guildIdStr.AsCode()} as an ID.");
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try {
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guild = await _rest.GetGuild(guildId);
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} catch (Myriad.Rest.Exceptions.ForbiddenException) {
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throw Errors.GuildNotFound(guildId);
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}
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if (guild != null)
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senderGuildUser = await _rest.GetGuildMember(guildId, ctx.Author.Id);
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if (guild == null || senderGuildUser == null)
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throw Errors.GuildNotFound(guildId);
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}
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var requiredPermissions = new []
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{
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PermissionSet.ViewChannel,
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PermissionSet.SendMessages,
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PermissionSet.AddReactions,
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PermissionSet.AttachFiles,
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PermissionSet.EmbedLinks,
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PermissionSet.ManageMessages,
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PermissionSet.ManageWebhooks
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};
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// Loop through every channel and group them by sets of permissions missing
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var permissionsMissing = new Dictionary<ulong, List<Channel>>();
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var hiddenChannels = false;
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var missingEmojiPermissions = false;
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foreach (var channel in await _rest.GetGuildChannels(guild.Id))
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{
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var botPermissions = _bot.PermissionsIn(channel.Id);
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var webhookPermissions = _cache.EveryonePermissions(channel);
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var userPermissions = PermissionExtensions.PermissionsFor(guild, channel, ctx.Author.Id, senderGuildUser);
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if ((userPermissions & PermissionSet.ViewChannel) == 0)
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{
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// If the user can't see this channel, don't calculate permissions for it
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// (to prevent info-leaking, mostly)
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// Instead, show the user that some channels got ignored (so they don't get confused)
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hiddenChannels = true;
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continue;
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}
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// We use a bitfield so we can set individual permission bits in the loop
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// TODO: Rewrite with proper bitfield math
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ulong missingPermissionField = 0;
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foreach (var requiredPermission in requiredPermissions)
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if ((botPermissions & requiredPermission) == 0)
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missingPermissionField |= (ulong) requiredPermission;
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if ((webhookPermissions & PermissionSet.UseExternalEmojis) == 0)
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{
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missingPermissionField |= (ulong) PermissionSet.UseExternalEmojis;
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missingEmojiPermissions = true;
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}
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// If we're not missing any permissions, don't bother adding it to the dict
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// This means we can check if the dict is empty to see if all channels are proxyable
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if (missingPermissionField != 0)
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{
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permissionsMissing.TryAdd(missingPermissionField, new List<Channel>());
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permissionsMissing[missingPermissionField].Add(channel);
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}
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}
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// Generate the output embed
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var eb = new EmbedBuilder()
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.Title($"Permission check for **{guild.Name}**");
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if (permissionsMissing.Count == 0)
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{
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eb.Description($"No errors found, all channels proxyable :)").Color(DiscordUtils.Green);
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}
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else
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{
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foreach (var (missingPermissionField, channels) in permissionsMissing)
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{
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// Each missing permission field can have multiple missing channels
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// so we extract them all and generate a comma-separated list
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var missingPermissionNames = ((PermissionSet) missingPermissionField).ToPermissionString();
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var channelsList = string.Join("\n", channels
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.OrderBy(c => c.Position)
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.Select(c => $"#{c.Name}"));
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eb.Field(new($"Missing *{missingPermissionNames}*", channelsList.Truncate(1000)));
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eb.Color(DiscordUtils.Red);
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}
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}
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var footer = "";
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if (hiddenChannels)
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footer += "Some channels were ignored as you do not have view access to them.";
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if (missingEmojiPermissions)
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{
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if (hiddenChannels) footer += " | ";
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footer += "Use External Emojis permissions must be granted to the @everyone role / Default Permissions.";
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}
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if (footer.Length > 0)
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eb.Footer(new(footer));
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// Send! :)
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await ctx.Reply(embed: eb.Build());
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}
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public async Task MessageProxyCheck(Context ctx)
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{
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if (!ctx.HasNext() && ctx.Message.MessageReference == null)
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throw new PKError("You need to specify a message.");
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var failedToGetMessage = "Could not find a valid message to check, was not able to fetch the message, or the message was not sent by you.";
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var (messageId, channelId) = ctx.MatchMessage(false);
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if (messageId == null || channelId == null)
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throw new PKError(failedToGetMessage);
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await using var conn = await _db.Obtain();
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var proxiedMsg = await _repo.GetMessage(conn, messageId.Value);
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if (proxiedMsg != null)
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{
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await ctx.Reply($"{Emojis.Success} This message was proxied successfully.");
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return;
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}
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// get the message info
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var msg = ctx.Message;
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try
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{
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msg = await _rest.GetMessage(channelId.Value, messageId.Value);
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}
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catch (ForbiddenException)
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{
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throw new PKError(failedToGetMessage);
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}
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// if user is fetching a message in a different channel sent by someone else, throw a generic error message
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if (msg == null || (msg.Author.Id != ctx.Author.Id && msg.ChannelId != ctx.Channel.Id))
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throw new PKError(failedToGetMessage);
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if ((_botConfig.Prefixes ?? BotConfig.DefaultPrefixes).Any(p => msg.Content.StartsWith(p)))
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throw new PKError("This message starts with the bot's prefix, and was parsed as a command.");
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if (msg.WebhookId != null)
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throw new PKError("You cannot check messages sent by a webhook.");
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if (msg.Author.Id != ctx.Author.Id)
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throw new PKError("You can only check your own messages.");
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// get the channel info
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var channel = _cache.GetChannel(channelId.Value);
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if (channel == null)
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throw new PKError("Unable to get the channel associated with this message.");
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// using channel.GuildId here since _rest.GetMessage() doesn't return the GuildId
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var context = await _repo.GetMessageContext(conn, msg.Author.Id, channel.GuildId.Value, msg.ChannelId);
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var members = (await _repo.GetProxyMembers(conn, msg.Author.Id, channel.GuildId.Value)).ToList();
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// Run everything through the checks, catch the ProxyCheckFailedException, and reply with the error message.
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try
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{
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_proxy.ShouldProxy(channel, msg, context);
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_matcher.TryMatch(context, members, out var match, msg.Content, msg.Attachments.Length > 0, context.AllowAutoproxy);
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await ctx.Reply("I'm not sure why this message was not proxied, sorry.");
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} catch (ProxyService.ProxyChecksFailedException e)
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{
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await ctx.Reply($"{e.Message}");
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}
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}
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}
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} |