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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2018-2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2015, 2018 Attila Molnar <attilamolnar@hush.com>
*
* 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 "modules/cap.h"
#include "modules/reload.h"
class CapNotify : public Cap::Capability
{
bool OnRequest(LocalUser* user, bool add) CXX11_OVERRIDE
{
// Users using the negotiation protocol v3.2 or newer may not turn off cap-notify
if ((!add) && (GetProtocol(user) != Cap::CAP_LEGACY))
return false;
return true;
}
bool OnList(LocalUser* user) CXX11_OVERRIDE
{
// If the client supports 3.2 enable cap-notify for them
if (GetProtocol(user) != Cap::CAP_LEGACY)
set(user, true);
return true;
}
public:
CapNotify(Module* mod)
: Cap::Capability(mod, "cap-notify")
{
}
};
class CapNotifyMessage : public Cap::MessageBase
{
public:
CapNotifyMessage(bool add, const std::string& capname)
: Cap::MessageBase((add ? "NEW" : "DEL"))
{
PushParamRef(capname);
}
};
class CapNotifyValueMessage : public Cap::MessageBase
{
std::string s;
const std::string::size_type pos;
public:
CapNotifyValueMessage(const std::string& capname)
: Cap::MessageBase("NEW")
, s(capname)
, pos(s.size()+1)
{
s.push_back('=');
PushParamRef(s);
}
void SetCapValue(const std::string& capvalue)
{
s.erase(pos);
s.append(capvalue);
InvalidateCache();
}
};
class ModuleIRCv3CapNotify : public Module, public Cap::EventListener, public ReloadModule::EventListener
{
CapNotify capnotify;
std::string reloadedmod;
std::vector<std::string> reloadedcaps;
ClientProtocol::EventProvider protoev;
void Send(const std::string& capname, Cap::Capability* cap, bool add)
{
CapNotifyMessage msg(add, capname);
CapNotifyValueMessage msgwithval(capname);
ClientProtocol::Event event(protoev, msg);
ClientProtocol::Event eventwithval(protoev, msgwithval);
const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
for (UserManager::LocalList::const_iterator i = list.begin(); i != list.end(); ++i)
{
LocalUser* user = *i;
if (!capnotify.get(user))
continue;
// Check that this user can actually see the cap.
if (add && (!cap || !cap->OnList(user)))
continue;
// If the cap is being added and the client supports cap values then show the value, if any
if ((add) && (capnotify.GetProtocol(user) != Cap::CAP_LEGACY))
{
const std::string* capvalue = cap->GetValue(user);
if ((capvalue) && (!capvalue->empty()))
{
msgwithval.SetUser(user);
msgwithval.SetCapValue(*capvalue);
user->Send(eventwithval);
continue;
}
}
msg.SetUser(user);
user->Send(event);
}
}
public:
ModuleIRCv3CapNotify()
: Cap::EventListener(this)
, ReloadModule::EventListener(this)
, capnotify(this)
, protoev(this, "CAP_NOTIFY")
{
}
void OnCapAddDel(Cap::Capability* cap, bool add) CXX11_OVERRIDE
{
if (cap->creator == this)
return;
if (cap->creator->ModuleSourceFile == reloadedmod)
{
if (!add)
reloadedcaps.push_back(cap->GetName());
return;
}
Send(cap->GetName(), cap, add);
}
void OnCapValueChange(Cap::Capability* cap) CXX11_OVERRIDE
{
// The value of a cap has changed, send CAP DEL and CAP NEW with the new value
Send(cap->GetName(), cap, false);
Send(cap->GetName(), cap, true);
}
void OnReloadModuleSave(Module* mod, ReloadModule::CustomData& cd) CXX11_OVERRIDE
{
if (mod == this)
return;
reloadedmod = mod->ModuleSourceFile;
// Request callback when reload is complete
cd.add(this, NULL);
}
void OnReloadModuleRestore(Module* mod, void* data) CXX11_OVERRIDE
{
// Reloading can change the set of caps provided by a module so assuming that if the reload succeeded all
// caps that the module previously provided are available or all were lost if the reload failed is wrong.
// Instead, we verify the availability of each cap individually.
dynamic_reference_nocheck<Cap::Manager> capmanager(this, "capmanager");
if (capmanager)
{
for (std::vector<std::string>::const_iterator i = reloadedcaps.begin(); i != reloadedcaps.end(); ++i)
{
const std::string& capname = *i;
if (!capmanager->Find(capname))
Send(capname, NULL, false);
}
}
reloadedmod.clear();
reloadedcaps.clear();
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Provides the IRCv3 cap-notify client capability.", VF_VENDOR);
}
};
MODULE_INIT(ModuleIRCv3CapNotify)
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