private async Task ExecuteProxy(IPKConnection conn, DiscordMessage trigger, MessageContext ctx,
ProxyMatch match, bool allowEveryone, bool allowEmbeds)
{
// Send the webhook
var content = match.ProxyContent;
if (!allowEmbeds)
{
content = content.BreakLinkEmbeds();
}
var id = await _webhookExecutor.ExecuteWebhook(trigger.Channel, match.Member.ProxyName(ctx),
match.Member.ProxyAvatar(ctx),
content, trigger.Attachments, allowEveryone);
Task SaveMessage() => _repo.AddMessage(conn, new PKMessage
{
Channel = trigger.ChannelId,
Guild = trigger.Channel.GuildId,
Member = match.Member.Id,
Mid = id,
OriginalMid = trigger.Id,
Sender = trigger.Author.Id
});
Task LogMessage() => _logChannel.LogMessage(ctx, match, trigger, id).AsTask();
async Task DeleteMessage()
{
// Wait a second or so before deleting the original message
await Task.Delay(MessageDeletionDelay);
try
{
await trigger.DeleteAsync();
}
catch (NotFoundException)
{
// If it's already deleted, we just log and swallow the exception
_logger.Warning("Attempted to delete already deleted proxy trigger message {Message}", trigger.Id);
}
}
// Run post-proxy actions (simultaneously; order doesn't matter)
// Note that only AddMessage is using our passed-in connection, careful not to pass it elsewhere and run into conflicts
await Task.WhenAll(
DeleteMessage(),
SaveMessage(),
LogMessage()
);
}
private async Task HandleProxyExecutedActions(DiscordClient shard, IPKConnection conn, MessageContext ctx,
DiscordMessage triggerMessage, DiscordMessage proxyMessage,
ProxyMatch match)
{
Task SaveMessageInDatabase() => _repo.AddMessage(conn, new PKMessage
{
Channel = triggerMessage.ChannelId,
Guild = triggerMessage.Channel.GuildId,
Member = match.Member.Id,
Mid = proxyMessage.Id,
OriginalMid = triggerMessage.Id,
Sender = triggerMessage.Author.Id
});
Task LogMessageToChannel() => _logChannel.LogMessage(shard, ctx, match, triggerMessage, proxyMessage.Id).AsTask();
async Task DeleteProxyTriggerMessage()
{
// Wait a second or so before deleting the original message
await Task.Delay(MessageDeletionDelay);
try
{
await triggerMessage.DeleteAsync();
}
catch (NotFoundException)
{
_logger.Debug("Trigger message {TriggerMessageId} was already deleted when we attempted to; deleting proxy message {ProxyMessageId} also",
triggerMessage.Id, proxyMessage.Id);
await HandleTriggerAlreadyDeleted(proxyMessage);
// Swallow the exception, we don't need it
}
}
// Run post-proxy actions (simultaneously; order doesn't matter)
// Note that only AddMessage is using our passed-in connection, careful not to pass it elsewhere and run into conflicts
await Task.WhenAll(
DeleteProxyTriggerMessage(),
SaveMessageInDatabase(),
LogMessageToChannel()
);
}
public async Task HandleMessageAsync(IMessage message)
{
// Bail early if this isn't in a guild channel
if (!(message.Channel is ITextChannel channel))
{
return;
}
// Find a member with proxy tags matching the message
var results = await _cache.GetResultsFor(message.Author.Id);
var match = GetProxyTagMatch(message.Content, results);
if (match == null)
{
return;
}
// And make sure the channel's not blacklisted from proxying.
var guildCfg = await _data.GetOrCreateGuildConfig(channel.GuildId);
if (guildCfg.Blacklist.Contains(channel.Id))
{
return;
}
// We know message.Channel can only be ITextChannel as PK doesn't work in DMs/groups
// Afterwards we ensure the bot has the right permissions, otherwise bail early
if (!await EnsureBotPermissions(channel))
{
return;
}
// Can't proxy a message with no content and no attachment
if (match.InnerText.Trim().Length == 0 && message.Attachments.Count == 0)
{
return;
}
// Get variables in order and all
var proxyName = match.Member.ProxyName(match.System.Tag);
var avatarUrl = match.Member.AvatarUrl ?? match.System.AvatarUrl;
// If the name's too long (or short), bail
if (proxyName.Length < 2)
{
throw Errors.ProxyNameTooShort(proxyName);
}
if (proxyName.Length > Limits.MaxProxyNameLength)
{
throw Errors.ProxyNameTooLong(proxyName);
}
// Add the proxy tags into the proxied message if that option is enabled
var messageContents = match.Member.KeepProxy
? $"{match.ProxyTags.Prefix}{match.InnerText}{match.ProxyTags.Suffix}"
: match.InnerText;
// Sanitize @everyone, but only if the original user wouldn't have permission to
messageContents = SanitizeEveryoneMaybe(message, messageContents);
// Execute the webhook itself
var hookMessageId = await _webhookExecutor.ExecuteWebhook(
channel,
proxyName, avatarUrl,
messageContents,
message.Attachments.FirstOrDefault()
);
// Store the message in the database, and log it in the log channel (if applicable)
await _data.AddMessage(message.Author.Id, hookMessageId, message.Channel.Id, message.Id, match.Member);
await _logChannel.LogMessage(match.System, match.Member, hookMessageId, message.Id, message.Channel as IGuildChannel, message.Author, match.InnerText);
// Wait a second or so before deleting the original message
await Task.Delay(1000);
try
{
await message.DeleteAsync();
}
catch (HttpException)
{
// If it's already deleted, we just log and swallow the exception
_logger.Warning("Attempted to delete already deleted proxy trigger message {Message}", message.Id);
}
}
public async Task HandleMessageAsync(GuildConfig guild, CachedAccount account, IMessage message, bool doAutoProxy)
{
// Bail early if this isn't in a guild channel
if (!(message.Channel is ITextChannel channel))
{
return;
}
// Find a member with proxy tags matching the message
var match = GetProxyTagMatch(message.Content, account.System, account.Members);
// O(n) lookup since n is small (max ~100 in prod) and we're more constrained by memory (for a dictionary) here
var systemSettingsForGuild = account.SettingsForGuild(channel.GuildId);
// If we didn't get a match by proxy tags, try to get one by autoproxy
// Also try if we *did* get a match, but there's no inner text. This happens if someone sends a message that
// is equal to someone else's tags, and messages like these should be autoproxied if possible
// All of this should only be done if this call allows autoproxy.
// When a normal message is sent, autoproxy is enabled, but if this method is called from a message *edit*
// event, then autoproxy is disabled. This is so AP doesn't "retrigger" when the original message was escaped.
if (doAutoProxy && (match == null || (match.InnerText.Trim().Length == 0 && message.Attachments.Count == 0)))
{
match = await GetAutoproxyMatch(account, systemSettingsForGuild, message, channel);
}
// If we still haven't found any, just yeet
if (match == null)
{
return;
}
// And make sure the channel's not blacklisted from proxying.
if (guild.Blacklist.Contains(channel.Id))
{
return;
}
// Make sure the system hasn't blacklisted the guild either
if (!systemSettingsForGuild.ProxyEnabled)
{
return;
}
// We know message.Channel can only be ITextChannel as PK doesn't work in DMs/groups
// Afterwards we ensure the bot has the right permissions, otherwise bail early
if (!await EnsureBotPermissions(channel))
{
return;
}
// Can't proxy a message with no content and no attachment
if (match.InnerText.Trim().Length == 0 && message.Attachments.Count == 0)
{
return;
}
var memberSettingsForGuild = account.SettingsForMemberGuild(match.Member.Id, channel.GuildId);
// Get variables in order and all
var proxyName = match.Member.ProxyName(match.System.Tag, memberSettingsForGuild.DisplayName);
var avatarUrl = memberSettingsForGuild.AvatarUrl ?? match.Member.AvatarUrl ?? match.System.AvatarUrl;
// If the name's too long (or short), bail
if (proxyName.Length < 2)
{
throw Errors.ProxyNameTooShort(proxyName);
}
if (proxyName.Length > Limits.MaxProxyNameLength)
{
throw Errors.ProxyNameTooLong(proxyName);
}
// Add the proxy tags into the proxied message if that option is enabled
// Also check if the member has any proxy tags - some cases autoproxy can return a member with no tags
var messageContents = (match.Member.KeepProxy && match.ProxyTags.HasValue)
? $"{match.ProxyTags.Value.Prefix}{match.InnerText}{match.ProxyTags.Value.Suffix}"
: match.InnerText;
// Sanitize @everyone, but only if the original user wouldn't have permission to
messageContents = SanitizeEveryoneMaybe(message, messageContents);
// Execute the webhook itself
var hookMessageId = await _webhookExecutor.ExecuteWebhook(
channel,
proxyName, avatarUrl,
messageContents,
message.Attachments
);
// Store the message in the database, and log it in the log channel (if applicable)
await _data.AddMessage(message.Author.Id, hookMessageId, channel.GuildId, message.Channel.Id, message.Id, match.Member);
await _logChannel.LogMessage(match.System, match.Member, hookMessageId, message.Id, message.Channel as IGuildChannel, message.Author, match.InnerText, guild);
// Wait a second or so before deleting the original message
await Task.Delay(1000);
try
{
await message.DeleteAsync();
}
catch (HttpException)
{
// If it's already deleted, we just log and swallow the exception
_logger.Warning("Attempted to delete already deleted proxy trigger message {Message}", message.Id);
}
}