private async Task TryPurgeInviteLinkAsync(IMessage message)
{
if
(
!(message.Author is IGuildUser author) || (author.Guild is null) ||
!(message.Channel is IGuildChannel channel) || (channel.Guild is null)
)
{
Log.Debug("Message {MessageId} was not in an IGuildChannel & IMessageChannel, or Author {Author} was not an IGuildUser",
message.Id, message.Author.Id);
return;
}
var selfUser = await SelfUserProvider.GetSelfUserAsync();
if (author.Id == selfUser.Id)
{
return;
}
var matches = _inviteLinkMatcher.Matches(message.Content);
if (!matches.Any())
{
return;
}
if (await DesignatedChannelService.ChannelHasDesignationAsync(channel.Guild, channel, DesignatedChannelType.Unmoderated))
{
return;
}
if (await AuthorizationService.HasClaimsAsync(author, AuthorizationClaim.PostInviteLink))
{
Log.Debug("Message {MessageId} was skipped because the author {Author} has the PostInviteLink claim",
message.Id, message.Author.Id);
return;
}
var invites = new List <IInvite>(matches.Count);
foreach (var code in matches.Select(x => x.Groups["Code"].Value))
{
var invite = await DiscordClient.GetInviteAsync(code);
invites.Add(invite);
}
// Allow invites to the guild in which the message was posted
if (invites.All(x => x?.GuildId == author.GuildId))
{
Log.Debug("Message {MessageId} was skipped because the invite was to this server", message.Id);
return;
}
Log.Debug("Message {MessageId} is going to be deleted", message.Id);
await ModerationService.DeleteMessageAsync(message, "Unauthorized Invite Link", selfUser.Id);
Log.Debug("Message {MessageId} was deleted because it contains an invite link", message.Id);
await message.Channel.SendMessageAsync($"Sorry {author.Mention} your invite link has been removed - please don't post links to other guilds");
}
