src/modules/m_chanhistory.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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         HistoryMode(Module* Creator) : ModeHandler(Creator, "history", 'H', PARAM_SETONLY, MODETYPE_CHANNEL),
  37                 ext("history", Creator) { }
  38
  39         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
  40         {
  41                 if (adding)
  42                 {
  43                         std::string::size_type colon = parameter.find(':');
  44                         if (colon == std::string::npos)
  45                                 return MODEACTION_DENY;
  46                         int len = atoi(parameter.substr(0, colon).c_str());
  47                         int time = ServerInstance->Duration(parameter.substr(colon+1));
  48                         if (len <= 0 || time < 0 || len > 50)
  49                                 return MODEACTION_DENY;
  50                         ext.set(channel, new HistoryList(len, time));
  51                         channel->SetModeParam('H', parameter);
  52                 }
  53                 else
  54                 {
  55                         ext.unset(channel);
  56                         channel->SetModeParam('H', "");
  57                 }
  58                 return MODEACTION_ALLOW;
  59         }
  60 };
  61
  62 class ModuleChanHistory : public Module
  63 {
  64         HistoryMode m;
  65  public:
  66         ModuleChanHistory() : m(this)
  67         {
  68                 if (!ServerInstance->Modes->AddMode(&m))
  69                         throw ModuleException("Could not add new modes!");
  70
  71                 Implementation eventlist[] = { I_OnUserJoin, I_OnUserMessage };
  72                 ServerInstance->Modules->Attach(eventlist, this, 2);
  73         }
  74
  75         ~ModuleChanHistory()
  76         {
  77                 ServerInstance->Modes->DelMode(&m);
  78         }
  79
  80         void OnUserMessage(User* user,void* dest,int target_type, const std::string &text, char status, const CUList&)
  81         {
  82                 if (target_type == TYPE_CHANNEL && status == 0)
  83                 {
  84                         Channel* c = (Channel*)dest;
  85                         HistoryList* list = m.ext.get(c);
  86                         if (list)
  87                         {
  88                                 char buf[MAXBUF];
  89                                 snprintf(buf, MAXBUF, ":%s PRIVMSG %s :%s",
  90                                         user->GetFullHost().c_str(), c->name.c_str(), text.c_str());
  91                                 list->lines.push_back(HistoryItem(buf));
  92                                 if (list->lines.size() > list->maxlen)
  93                                         list->lines.pop_front();
  94                         }
  95                 }
  96         }
  97
  98         void OnUserJoin(Membership* memb, bool sync, bool created, CUList& except_list)
  99         {
 100                 HistoryList* list = m.ext.get(memb->chan);
 101                 if (!list)
 102                         return;
 103                 time_t mintime = 0;
 104                 if (list->maxtime)
 105                         mintime = ServerInstance->Time() - list->maxtime;
 106                 memb->user->WriteServ("NOTICE %s :Replaying up to %d lines of pre-join history spanning up to %d seconds",
 107                         memb->chan->name.c_str(), list->maxlen, list->maxtime);
 108                 for(std::deque<HistoryItem>::iterator i = list->lines.begin(); i != list->lines.end(); ++i)
 109                 {
 110                         if (i->ts >= mintime)
 111                                 memb->user->Write(i->line);
 112                 }
 113         }
 114
 115         Version GetVersion()
 116         {
 117                 return Version("Provides channel history replayed on join", VF_COMMON | VF_VENDOR);
 118         }
 119 };
 120
 121 MODULE_INIT(ModuleChanHistory)