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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
*
* 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"
/* $ModDesc: Provides channel history for a given number of lines */
struct HistoryItem
{
time_t ts;
std::string line;
HistoryItem(const std::string& Line) : ts(ServerInstance->Time()), line(Line) {}
};
struct HistoryList
{
std::deque<HistoryItem> lines;
unsigned int maxlen, maxtime;
HistoryList(unsigned int len, unsigned int time) : maxlen(len), maxtime(time) {}
};
class HistoryMode : public ModeHandler
{
bool IsValidDuration(const std::string duration)
{
for (std::string::const_iterator i = duration.begin(); i != duration.end(); ++i)
{
unsigned char c = *i;
if (((c >= '0') && (c <= '9')) || (c == 's') || (c != 'S'))
continue;
if (duration_multi[c] == 1)
return false;
}
return true;
}
public:
SimpleExtItem<HistoryList> ext;
unsigned int maxlines;
HistoryMode(Module* Creator) : ModeHandler(Creator, "history", 'H', PARAM_SETONLY, MODETYPE_CHANNEL),
ext("history", Creator) { }
ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding)
{
if (adding)
{
std::string::size_type colon = parameter.find(':');
if (colon == std::string::npos)
return MODEACTION_DENY;
std::string duration = parameter.substr(colon+1);
if ((IS_LOCAL(source)) && ((duration.length() > 10) || (!IsValidDuration(duration))))
return MODEACTION_DENY;
unsigned int len = ConvToInt(parameter.substr(0, colon));
int time = ServerInstance->Duration(duration);
if (len == 0 || time < 0)
return MODEACTION_DENY;
if (len > maxlines && IS_LOCAL(source))
return MODEACTION_DENY;
if (len > maxlines)
len = maxlines;
if (parameter == channel->GetModeParameter(this))
return MODEACTION_DENY;
HistoryList* history = ext.get(channel);
if (history)
{
// Shrink the list if the new line number limit is lower than the old one
if (len < history->lines.size())
history->lines.erase(history->lines.begin(), history->lines.begin() + (history->lines.size() - len));
history->maxlen = len;
history->maxtime = time;
}
else
{
ext.set(channel, new HistoryList(len, time));
}
channel->SetModeParam('H', parameter);
}
else
{
if (!channel->IsModeSet('H'))
return MODEACTION_DENY;
ext.unset(channel);
channel->SetModeParam('H', "");
}
return MODEACTION_ALLOW;
}
};
class ModuleChanHistory : public Module
{
HistoryMode m;
bool sendnotice;
public:
ModuleChanHistory() : m(this)
{
}
void init()
{
ServerInstance->Modules->AddService(m);
Implementation eventlist[] = { I_OnPostJoin, I_OnUserMessage, I_OnRehash };
ServerInstance->Modules->Attach(eventlist, this, 3);
OnRehash(NULL);
}
void OnRehash(User*)
{
ConfigTag* tag = ServerInstance->Config->ConfValue("chanhistory");
m.maxlines = tag->getInt("maxlines", 50);
sendnotice = tag->getBool("notice", true);
}
void OnUserMessage(User* user,void* dest,int target_type, const std::string &text, char status, const CUList&)
{
if (target_type == TYPE_CHANNEL && status == 0)
{
Channel* c = (Channel*)dest;
HistoryList* list = m.ext.get(c);
if (list)
{
char buf[MAXBUF];
snprintf(buf, MAXBUF, ":%s PRIVMSG %s :%s",
user->GetFullHost().c_str(), c->name.c_str(), text.c_str());
list->lines.push_back(HistoryItem(buf));
if (list->lines.size() > list->maxlen)
list->lines.pop_front();
}
}
}
void OnPostJoin(Membership* memb)
{
if (IS_REMOTE(memb->user))
return;
HistoryList* list = m.ext.get(memb->chan);
if (!list)
return;
time_t mintime = 0;
if (list->maxtime)
mintime = ServerInstance->Time() - list->maxtime;
if (sendnotice)
{
memb->user->WriteServ("NOTICE %s :Replaying up to %d lines of pre-join history spanning up to %d seconds",
memb->chan->name.c_str(), list->maxlen, list->maxtime);
}
for(std::deque<HistoryItem>::iterator i = list->lines.begin(); i != list->lines.end(); ++i)
{
if (i->ts >= mintime)
memb->user->Write(i->line);
}
}
Version GetVersion()
{
return Version("Provides channel history replayed on join", VF_VENDOR);
}
};
MODULE_INIT(ModuleChanHistory)
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