src/modules/m_chanhistory.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 /* $ModDesc: Provides channel history for a given number of lines */
  17
  18 struct HistoryItem
  19 {
  20         time_t ts;
  21         std::string line;
  22         HistoryItem(const std::string& Line) : ts(ServerInstance->Time()), line(Line) {}
  23 };
  24
  25 struct HistoryList
  26 {
  27         std::deque<HistoryItem> lines;
  28         unsigned int maxlen, maxtime;
  29         HistoryList(unsigned int len, unsigned int time) : maxlen(len), maxtime(time) {}
  30 };
  31
  32 class HistoryMode : public ModeHandler
  33 {
  34  public:
  35         SimpleExtItem<HistoryList> ext;
  36         int maxlines;
  37         HistoryMode(Module* Creator) : ModeHandler(Creator, "history", 'H', PARAM_SETONLY, MODETYPE_CHANNEL),
  38                 ext("history", Creator) { }
  39
  40         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
  41         {
  42                 if (adding)
  43                 {
  44                         std::string::size_type colon = parameter.find(':');
  45                         if (colon == std::string::npos)
  46                                 return MODEACTION_DENY;
  47                         int len = atoi(parameter.substr(0, colon).c_str());
  48                         int time = ServerInstance->Duration(parameter.substr(colon+1));
  49                         if (len <= 0 || time < 0)
  50                                 return MODEACTION_DENY;
  51                         if (len > maxlines && IS_LOCAL(source))
  52                                 return MODEACTION_DENY;
  53                         if (len > maxlines)
  54                                 len = maxlines;
  55                         if (parameter == channel->GetModeParameter(this))
  56                                 return MODEACTION_DENY;
  57                         ext.set(channel, new HistoryList(len, time));
  58                         channel->SetModeParam('H', parameter);
  59                 }
  60                 else
  61                 {
  62                         ext.unset(channel);
  63                         channel->SetModeParam('H', "");
  64                 }
  65                 return MODEACTION_ALLOW;
  66         }
  67 };
  68
  69 class ModuleChanHistory : public Module
  70 {
  71         HistoryMode m;
  72  public:
  73         ModuleChanHistory() : m(this)
  74         {
  75         }
  76
  77         void init()
  78         {
  79                 ServerInstance->Modules->AddService(m);
  80
  81                 Implementation eventlist[] = { I_OnPostJoin, I_OnUserMessage, I_OnRehash };
  82                 ServerInstance->Modules->Attach(eventlist, this, 3);
  83                 OnRehash(NULL);
  84         }
  85
  86         void OnRehash(User*)
  87         {
  88                 m.maxlines = ServerInstance->Config->ConfValue("chanhistory")->getInt("maxlines", 50);
  89         }
  90
  91         ~ModuleChanHistory()
  92         {
  93                 ServerInstance->Modes->DelMode(&m);
  94         }
  95
  96         void OnUserMessage(User* user,void* dest,int target_type, const std::string &text, char status, const CUList&)
  97         {
  98                 if (target_type == TYPE_CHANNEL && status == 0)
  99                 {
 100                         Channel* c = (Channel*)dest;
 101                         HistoryList* list = m.ext.get(c);
 102                         if (list)
 103                         {
 104                                 char buf[MAXBUF];
 105                                 snprintf(buf, MAXBUF, ":%s PRIVMSG %s :%s",
 106                                         user->GetFullHost().c_str(), c->name.c_str(), text.c_str());
 107                                 list->lines.push_back(HistoryItem(buf));
 108                                 if (list->lines.size() > list->maxlen)
 109                                         list->lines.pop_front();
 110                         }
 111                 }
 112         }
 113
 114         void OnPostJoin(Membership* memb)
 115         {
 116                 HistoryList* list = m.ext.get(memb->chan);
 117                 if (!list)
 118                         return;
 119                 time_t mintime = 0;
 120                 if (list->maxtime)
 121                         mintime = ServerInstance->Time() - list->maxtime;
 122                 memb->user->WriteServ("NOTICE %s :Replaying up to %d lines of pre-join history spanning up to %d seconds",
 123                         memb->chan->name.c_str(), list->maxlen, list->maxtime);
 124                 for(std::deque<HistoryItem>::iterator i = list->lines.begin(); i != list->lines.end(); ++i)
 125                 {
 126                         if (i->ts >= mintime)
 127                                 memb->user->Write(i->line);
 128                 }
 129         }
 130
 131         Version GetVersion()
 132         {
 133                 return Version("Provides channel history replayed on join", VF_VENDOR);
 134         }
 135 };
 136
 137 MODULE_INIT(ModuleChanHistory)