private async Task ExecuteProxy(Message trigger, MessageContext ctx, AutoproxySettings autoproxySettings,
ProxyMatch match, bool allowEveryone, bool allowEmbeds)
{
// Create reply embed
var embeds = new List <Embed>();
var content = "";
if (trigger.Type == Message.MessageType.Reply && trigger.MessageReference?.ChannelId == trigger.ChannelId)
{
var repliedTo = trigger.ReferencedMessage.Value;
if (repliedTo != null)
{
if (trigger.Mentions.Length > 0 &&
repliedTo.Author.Id == trigger.Mentions[0].Id &&
!(trigger.Content.Contains($"<@{repliedTo.Author.Id}>") ||
trigger.Content.Contains($"<@!{repliedTo.Author.Id}>")))
{
content = $"*<@{repliedTo.Author.Id}>*\n";
}
var(nickname, avatar) = await FetchReferencedMessageAuthorInfo(trigger, repliedTo);
var embed = CreateReplyEmbed(match, trigger, repliedTo, nickname, avatar);
if (embed != null)
{
embeds.Add(embed);
}
}
// TODO: have a clean error for when message can't be fetched instead of just being silent
}
// Send the webhook
content += match.ProxyContent;
if (!allowEmbeds)
{
content = content.BreakLinkEmbeds();
}
var messageChannel = await _cache.GetChannel(trigger.ChannelId);
var rootChannel = await _cache.GetRootChannel(trigger.ChannelId);
var threadId = messageChannel.IsThread() ? messageChannel.Id : (ulong?)null;
var guild = await _cache.GetGuild(trigger.GuildId.Value);
var proxyMessage = await _webhookExecutor.ExecuteWebhook(new ProxyRequest
{
GuildId = trigger.GuildId !.Value,
ChannelId = rootChannel.Id,
ThreadId = threadId,
Name = await FixSameName(messageChannel.Id, ctx, match.Member),
AvatarUrl = AvatarUtils.TryRewriteCdnUrl(match.Member.ProxyAvatar(ctx)),
Content = content,
Attachments = trigger.Attachments,
FileSizeLimit = guild.FileSizeLimit(),
Embeds = embeds.ToArray(),
Stickers = trigger.StickerItems,
AllowEveryone = allowEveryone
});
public static async Task <PermissionSet> PermissionsFor(this IDiscordCache cache, ulong channelId, ulong userId,
GuildMemberPartial?member, bool isWebhook = false)
{
if (!(await cache.TryGetChannel(channelId) is Channel channel))
{
// todo: handle channel not found better
return(PermissionSet.Dm);
}
if (channel.GuildId == null)
{
return(PermissionSet.Dm);
}
var rootChannel = await cache.GetRootChannel(channelId);
var guild = await cache.GetGuild(channel.GuildId.Value);
if (isWebhook)
{
return(EveryonePermissions(guild));
}
return(PermissionsFor(guild, rootChannel, userId, member));
}
public async Task Handle(int shardId, MessageCreateEvent evt)
{
if (evt.Author.Id == await _cache.GetOwnUser())
{
return;
}
if (evt.Type != Message.MessageType.Default && evt.Type != Message.MessageType.Reply)
{
return;
}
if (IsDuplicateMessage(evt))
{
return;
}
if (!(await _cache.PermissionsIn(evt.ChannelId)).HasFlag(PermissionSet.SendMessages))
{
return;
}
// spawn off saving the private channel into another thread
// it is not a fatal error if this fails, and it shouldn't block message processing
_ = _dmCache.TrySavePrivateChannel(evt);
var guild = evt.GuildId != null ? await _cache.GetGuild(evt.GuildId.Value) : null;
var channel = await _cache.GetChannel(evt.ChannelId);
var rootChannel = await _cache.GetRootChannel(evt.ChannelId);
// Log metrics and message info
_metrics.Measure.Meter.Mark(BotMetrics.MessagesReceived);
_lastMessageCache.AddMessage(evt);
// Get message context from DB (tracking w/ metrics)
MessageContext ctx;
using (_metrics.Measure.Timer.Time(BotMetrics.MessageContextQueryTime))
ctx = await _repo.GetMessageContext(evt.Author.Id, evt.GuildId ?? default, rootChannel.Id);
// Try each handler until we find one that succeeds
if (await TryHandleLogClean(evt, ctx))
{
return;
}
// Only do command/proxy handling if it's a user account
if (evt.Author.Bot || evt.WebhookId != null || evt.Author.System == true)
{
return;
}
if (await TryHandleCommand(shardId, evt, guild, channel, ctx))
{
return;
}
await TryHandleProxy(evt, guild, channel, ctx);
}
public static PermissionSet PermissionsFor(this IDiscordCache cache, ulong channelId, ulong userId, ICollection <ulong>?userRoles)
{
var channel = cache.GetChannel(channelId);
if (channel.GuildId == null)
{
return(PermissionSet.Dm);
}
var guild = cache.GetGuild(channel.GuildId.Value);
return(PermissionsFor(guild, channel, userId, userRoles));
}
public async Task Handle(Shard shard, MessageCreateEvent evt)
{
if (evt.Author.Id == shard.User?.Id)
{
return;
}
if (evt.Type != Message.MessageType.Default && evt.Type != Message.MessageType.Reply)
{
return;
}
if (IsDuplicateMessage(evt))
{
return;
}
var guild = evt.GuildId != null?_cache.GetGuild(evt.GuildId.Value) : null;
var channel = _cache.GetChannel(evt.ChannelId);
var rootChannel = _cache.GetRootChannel(evt.ChannelId);
// Log metrics and message info
_metrics.Measure.Meter.Mark(BotMetrics.MessagesReceived);
_lastMessageCache.AddMessage(evt);
// Get message context from DB (tracking w/ metrics)
MessageContext ctx;
await using (var conn = await _db.Obtain())
using (_metrics.Measure.Timer.Time(BotMetrics.MessageContextQueryTime))
ctx = await _repo.GetMessageContext(conn, evt.Author.Id, evt.GuildId ?? default, rootChannel.Id);
// Try each handler until we find one that succeeds
if (await TryHandleLogClean(evt, ctx))
{
return;
}
// Only do command/proxy handling if it's a user account
if (evt.Author.Bot || evt.WebhookId != null || evt.Author.System == true)
{
return;
}
if (await TryHandleCommand(shard, evt, guild, channel, ctx))
{
return;
}
await TryHandleProxy(shard, evt, guild, channel, ctx);
}
public static PermissionSet PermissionsFor(this IDiscordCache cache, ulong channelId, ulong userId, ICollection <ulong>?userRoles, bool isWebhook = false)
{
if (!cache.TryGetChannel(channelId, out var channel))
{
// todo: handle channel not found better
return(PermissionSet.Dm);
}
if (channel.GuildId == null)
{
return(PermissionSet.Dm);
}
var rootChannel = cache.GetRootChannel(channelId);
var guild = cache.GetGuild(channel.GuildId.Value);
if (isWebhook)
{
return(EveryonePermissions(guild));
}
return(PermissionsFor(guild, rootChannel, userId, userRoles));
}
private async Task <Message> ExecuteWebhookInner(Webhook webhook, ProxyRequest req, bool hasRetried = false)
{
var guild = await _cache.GetGuild(req.GuildId);
var content = req.Content.Truncate(2000);
var allowedMentions = content.ParseMentions();
if (!req.AllowEveryone)
{
allowedMentions = allowedMentions.RemoveUnmentionableRoles(guild) with
{
// also clear @everyones
Parse = Array.Empty <AllowedMentions.ParseType>()
}
}
;
var webhookReq = new ExecuteWebhookRequest
{
Username = FixProxyName(req.Name).Truncate(80),
Content = content,
AllowedMentions = allowedMentions,
AvatarUrl = !string.IsNullOrWhiteSpace(req.AvatarUrl) ? req.AvatarUrl : null,
Embeds = req.Embeds,
Stickers = req.Stickers,
};
MultipartFile[] files = null;
var attachmentChunks = ChunkAttachmentsOrThrow(req.Attachments, req.FileSizeLimit);
if (attachmentChunks.Count > 0)
{
_logger.Information(
"Invoking webhook with {AttachmentCount} attachments totalling {AttachmentSize} MiB in {AttachmentChunks} chunks",
req.Attachments.Length, req.Attachments.Select(a => a.Size).Sum() / 1024 / 1024,
attachmentChunks.Count);
files = await GetAttachmentFiles(attachmentChunks[0]);
webhookReq.Attachments = files.Select(f => new Message.Attachment
{
Id = (ulong)Array.IndexOf(files, f),
Description = f.Description,
Filename = f.Filename
}).ToArray();
}
Message webhookMessage;
using (_metrics.Measure.Timer.Time(BotMetrics.WebhookResponseTime))
{
try
{
webhookMessage =
await _rest.ExecuteWebhook(webhook.Id, webhook.Token, webhookReq, files, req.ThreadId);
}
catch (JsonReaderException)
{
// This happens sometimes when we hit a CloudFlare error (or similar) on Discord's end
// Nothing we can do about this - happens sometimes under server load, so just drop the message and give up
throw new WebhookExecutionErrorOnDiscordsEnd();
}
catch (NotFoundException e)
{
if (e.ErrorCode == 10015 && !hasRetried)
{
// Error 10015 = "Unknown Webhook" - this likely means the webhook was deleted
// but is still in our cache. Invalidate, refresh, try again
_logger.Warning("Error invoking webhook {Webhook} in channel {Channel} (thread {ThreadId})",
webhook.Id, webhook.ChannelId, req.ThreadId);
var newWebhook = await _webhookCache.InvalidateAndRefreshWebhook(req.ChannelId, webhook);
return(await ExecuteWebhookInner(newWebhook, req, true));
}
throw;
}
}
// We don't care about whether the sending succeeds, and we don't want to *wait* for it, so we just fork it off
var _ = TrySendRemainingAttachments(webhook, req.Name, req.AvatarUrl, attachmentChunks, req.ThreadId);
return(webhookMessage);
}