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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2026 Sadie Powell <sadie@sadiepowell.dev>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "listmode.h"
#include "modules/extban.h"
#include "numerichelper.h"
enum
{
// InspIRCd-specific.
ERR_BADCHANNEL = 926
};
class ShareExtBan final
: public ExtBan::MatchingBase
{
private:
ChanModeReference secretmode;
std::vector<Channel*> seen;
public:
size_t maxdepth;
ShareExtBan(Module* mod)
: ExtBan::MatchingBase(mod, "share", 'b')
, secretmode(mod, "secret")
{
}
bool IsMatch(User* user, Channel* channel, const std::string& text) override
{
if (seen.size() >= maxdepth)
return false;
auto banned = false;
auto* targetchan = ServerInstance->Channels.Find(text);
if (targetchan && targetchan != channel)
{
seen.push_back(channel);
banned = targetchan->IsBanned(user);
stdalgo::erase(seen, channel);
}
return banned;
}
bool Validate(ListModeBase* lm, LocalUser* user, Channel* channel, std::string& text) override
{
auto* targetchan = ServerInstance->Channels.Find(text);
if (!targetchan || (targetchan->IsModeSet(secretmode) && (!targetchan->HasUser(user) && !user->HasPrivPermission("channels/auspex"))))
{
user->WriteNumeric(Numerics::NoSuchChannel(text));
return false;
}
if (targetchan == channel)
{
user->WriteNumeric(ERR_BADCHANNEL, text, "You can not create a channel ban loop.");
return false;
}
auto* memb = targetchan->GetUser(user);
if (!memb)
{
user->WriteNumeric(ERR_NOTONCHANNEL, targetchan->name, "You're not on that channel!");
return false;
}
const auto rank = lm->GetLevelRequired(true);
if (memb->GetRank() < rank)
{
user->WriteNumeric(Numerics::ChannelPrivilegesNeeded(targetchan, rank, "share bans between channels"));
return false;
}
return true;
}
};
class ModuleShareBans final
: public Module
{
private:
ShareExtBan extban;
public:
ModuleShareBans()
: Module(VF_VENDOR | VF_OPTCOMMON, "Adds extended ban b: (share) which allows sharing bans between channels.")
, extban(this)
{
}
void ReadConfig(ConfigStatus& status) override
{
const auto& tag = ServerInstance->Config->ConfValue("sharebans");
extban.maxdepth = tag->getNum<size_t>("maxdepth", 2, 1, 100);
}
};
MODULE_INIT(ModuleShareBans)
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