]> git.netwichtig.de Git - user/henk/code/inspircd.git/blobdiff - src/modules/m_watch.cpp
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[user/henk/code/inspircd.git] / src / modules / m_watch.cpp
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-/*       +------------------------------------+\r *       | Inspire Internet Relay Chat Daemon |\r *       +------------------------------------+\r *\r *  InspIRCd: (C) 2002-2007 InspIRCd Development Team\r * See: http://www.inspircd.org/wiki/index.php/Credits\r *\r * This program is free but copyrighted software; see\r *            the file COPYING for details.\r *\r * ---------------------------------------------------\r */\r\r#include "inspircd.h"\r#include "users.h"\r#include "channels.h"\r#include "modules.h"\r#include "hashcomp.h"\r\r/* $ModDesc: Provides support for the /WATCH command */\r\r/* This module has been refactored to provide a very efficient (in terms of cpu time)\r * implementation of /WATCH.\r *\r * To improve the efficiency of watch, many lists are kept. The first primary list is\r * a hash_map of who's being watched by who. For example:\r *\r * KEY: Brain   --->  Watched by:  Boo, w00t, Om\r * KEY: Boo     --->  Watched by:  Brain, w00t\r * \r * This is used when we want to tell all the users that are watching someone that\r * they are now available or no longer available. For example, if the hash was\r * populated as shown above, then when Brain signs on, messages are sent to Boo, w00t\r * and Om by reading their 'watched by' list. When this occurs, their online status\r * in each of these users lists (see below) is also updated.\r *\r * Each user also has a seperate (smaller) map attached to their userrec whilst they\r * have any watch entries, which is managed by class Extensible. When they add or remove\r * a watch entry from their list, it is inserted here, as well as the main list being\r * maintained. This map also contains the user's online status. For users that are\r * offline, the key points at an empty string, and for users that are online, the key\r * points at a string containing "users-ident users-host users-signon-time". This is\r * stored in this manner so that we don't have to FindUser() to fetch this info, the\r * users signon can populate the field for us.\r *\r * For example, going again on the example above, this would be w00t's watchlist:\r *\r * KEY: Boo    --->  Status: "Boo brains.sexy.babe 535342348"\r * KEY: Brain  --->  Status: ""\r *\r * In this list we can see that Boo is online, and Brain is offline. We can then\r * use this list for 'WATCH L', and 'WATCH S' can be implemented as a combination\r * of the above two data structures, with minimum CPU penalty for doing so.\r *\r * In short, the least efficient this ever gets is O(n), and thats only because\r * there are parts that *must* loop (e.g. telling all users that are watching a\r * nick that the user online), however this is a *major* improvement over the\r * 1.0 implementation, which in places had O(n^n) and worse in it, because this\r * implementation scales based upon the sizes of the watch entries, whereas the\r * old system would scale (or not as the case may be) according to the total number\r * of users using WATCH.\r */\r\r/*\r * Before you start screaming, this definition is only used here, so moving it to a header is pointless.\r * Yes, it's horrid. Blame cl for being different. -- w00t\r */\r#ifdef WINDOWS\rtypedef nspace::hash_map<irc::string, std::deque<userrec*>, nspace::hash_compare<irc::string, less<irc::string> > > watchentries;\r#else\rtypedef nspace::hash_map<irc::string, std::deque<userrec*>, nspace::hash<irc::string> > watchentries;\r#endif\rtypedef std::map<irc::string, std::string> watchlist;\r\r/* Who's watching each nickname.\r * NOTE: We do NOT iterate this to display a user's WATCH list!\r * See the comments above!\r */\rwatchentries* whos_watching_me;\r\r/** Handle /WATCH\r */\rclass cmd_watch : public command_t\r{\r    unsigned int& MAX_WATCH;\r public:\r      CmdResult remove_watch(userrec* user, const char* nick)\r        {\r              // removing an item from the list\r              if (!ServerInstance->IsNick(nick))\r             {\r                      user->WriteServ("942 %s %s :Invalid nickname", user->nick, nick);\r                      return CMD_FAILURE;\r            }\r\r             watchlist* wl;\r         if (user->GetExt("watchlist", wl))\r             {\r                      /* Yup, is on my list */\r                       watchlist::iterator n = wl->find(nick);\r                        if (n != wl->end())\r                    {\r                              if (!n->second.empty())\r                                        user->WriteServ("602 %s %s %s :stopped watching", user->nick, n->first.c_str(), n->second.c_str());\r                            else\r                                   user->WriteServ("602 %s %s * * 0 :stopped watching", user->nick, nick);\r\r                               wl->erase(n);\r                  }\r\r                     if (!wl->size())\r                       {\r                              user->Shrink("watchlist");\r                             delete wl;\r                     }\r\r                     watchentries::iterator x = whos_watching_me->find(nick);\r                       if (x != whos_watching_me->end())\r                      {\r                              /* People are watching this user, am i one of them? */\r                         std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);\r                                if (n != x->second.end())\r                                      /* I'm no longer watching you... */\r                                    x->second.erase(n);\r\r                           if (!x->second.size())\r                                 whos_watching_me->erase(nick);\r                 }\r              }\r\r             /* This might seem confusing, but we return CMD_FAILURE\r                 * to indicate that this message shouldnt be routed across\r              * the network to other linked servers.\r                 */\r            return CMD_FAILURE;\r    }\r\r     CmdResult add_watch(userrec* user, const char* nick)\r   {\r              if (!ServerInstance->IsNick(nick))\r             {\r                      user->WriteServ("942 %s %s :Invalid nickname",user->nick,nick);\r                        return CMD_FAILURE;\r            }\r\r             watchlist* wl;\r         if (!user->GetExt("watchlist", wl))\r            {\r                      wl = new watchlist();\r                  user->Extend("watchlist", wl);\r         }\r\r             if (wl->size() == MAX_WATCH)\r           {\r                      user->WriteServ("512 %s %s :Too many WATCH entries", user->nick, nick);\r                        return CMD_FAILURE;\r            }\r\r             watchlist::iterator n = wl->find(nick);\r                if (n == wl->end())\r            {\r                      /* Don't already have the user on my watch list, proceed */\r                    watchentries::iterator x = whos_watching_me->find(nick);\r                       if (x != whos_watching_me->end())\r                      {\r                              /* People are watching this user, add myself */\r                                x->second.push_back(user);\r                     }\r                      else\r                   {\r                              std::deque<userrec*> newlist;\r                          newlist.push_back(user);\r                               (*(whos_watching_me))[nick] = newlist;\r                 }\r\r                     userrec* target = ServerInstance->FindNick(nick);\r                      if (target)\r                    {\r                              if (target->Visibility && !target->Visibility->VisibleTo(user))\r                                {\r                                      (*wl)[nick] = "";\r                                      user->WriteServ("605 %s %s * * 0 :is offline",user->nick, nick);\r                                       return CMD_FAILURE;\r                            }\r\r                             (*wl)[nick] = std::string(target->ident).append(" ").append(target->dhost).append(" ").append(ConvToStr(target->age));\r                         user->WriteServ("604 %s %s %s :is online",user->nick, nick, (*wl)[nick].c_str());\r                      }\r                      else\r                   {\r                              (*wl)[nick] = "";\r                              user->WriteServ("605 %s %s * * 0 :is offline",user->nick, nick);\r                       }\r              }\r\r             return CMD_FAILURE;\r    }\r\r     cmd_watch (InspIRCd* Instance, unsigned int &maxwatch) : command_t(Instance,"WATCH",0,0), MAX_WATCH(maxwatch)\r  {\r              this->source = "m_watch.so";\r           syntax = "[C|L|S]|[+|-<nick>]";\r        }\r\r     CmdResult Handle (const char** parameters, int pcnt, userrec *user)\r    {\r              if (!pcnt)\r             {\r                      watchlist* wl;\r                 if (user->GetExt("watchlist", wl))\r                     {\r                              for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)\r                         {\r                                      if (!q->second.empty())\r                                                user->WriteServ("604 %s %s %s :is online", user->nick, q->first.c_str(), q->second.c_str());\r                           }\r                      }\r                      user->WriteServ("607 %s :End of WATCH list",user->nick);\r               }\r              else if (pcnt > 0)\r             {\r                      for (int x = 0; x < pcnt; x++)\r                 {\r                              const char *nick = parameters[x];\r                              if (!strcasecmp(nick,"C"))\r                             {\r                                      // watch clear\r                                 watchlist* wl;\r                                 if (user->GetExt("watchlist", wl))\r                                     {\r                                              for (watchlist::iterator i = wl->begin(); i != wl->end(); i++)\r                                         {\r                                                      watchentries::iterator x = whos_watching_me->find(i->first);\r                                                   if (x != whos_watching_me->end())\r                                                      {\r                                                              /* People are watching this user, am i one of them? */\r                                                         std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);\r                                                                if (n != x->second.end())\r                                                                      /* I'm no longer watching you... */\r                                                                    x->second.erase(n);\r\r                                                           if (!x->second.size())\r                                                                 whos_watching_me->erase(user->nick);\r                                                   }\r                                              }\r\r                                             delete wl;\r                                             user->Shrink("watchlist");\r                                     }\r                              }\r                              else if (!strcasecmp(nick,"L"))\r                                {\r                                      watchlist* wl;\r                                 if (user->GetExt("watchlist", wl))\r                                     {\r                                              for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)\r                                         {\r                                                      if (!q->second.empty())\r                                                                user->WriteServ("604 %s %s %s :is online", user->nick, q->first.c_str(), q->second.c_str());\r                                                   else\r                                                           user->WriteServ("605 %s %s * * 0 :is offline", user->nick, q->first.c_str());\r                                          }\r                                      }\r                                      user->WriteServ("607 %s :End of WATCH list",user->nick);\r                               }\r                              else if (!strcasecmp(nick,"S"))\r                                {\r                                      watchlist* wl;\r                                 int you_have = 0;\r                                      int youre_on = 0;\r                                      std::string list;\r\r                                     if (user->GetExt("watchlist", wl))\r                                     {\r                                              for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)\r                                                 list.append(q->first.c_str()).append(" ");\r                                             you_have = wl->size();\r                                 }\r\r                                     watchentries::iterator x = whos_watching_me->find(user->nick);\r                                 if (x != whos_watching_me->end())\r                                              youre_on = x->second.size();\r\r                                  user->WriteServ("603 %s :You have %d and are on %d WATCH entries", user->nick, you_have, youre_on);\r                                    user->WriteServ("606 %s :%s",user->nick, list.c_str());\r                                        user->WriteServ("607 %s :End of WATCH S",user->nick);\r                          }\r                              else if (nick[0] == '-')\r                               {\r                                      nick++;\r                                        remove_watch(user, nick);\r                              }\r                              else if (nick[0] == '+')\r                               {\r                                      nick++;\r                                        add_watch(user, nick);\r                         }\r                      }\r              }\r              /* So that spanningtree doesnt pass the WATCH commands to the network! */\r              return CMD_FAILURE;\r    }\r};\r\rclass Modulewatch : public Module\r{\r      cmd_watch* mycommand;\r  unsigned int maxwatch;\r public:\r\r       Modulewatch(InspIRCd* Me)\r              : Module(Me), maxwatch(32)\r     {\r              OnRehash(NULL, "");\r            whos_watching_me = new watchentries();\r         mycommand = new cmd_watch(ServerInstance, maxwatch);\r           ServerInstance->AddCommand(mycommand);\r }\r\r     virtual void OnRehash(userrec* user, const std::string &parameter)\r     {\r              ConfigReader Conf(ServerInstance);\r             maxwatch = Conf.ReadInteger("watch", "maxentries", 0, true);\r           if (!maxwatch)\r                 maxwatch = 32;\r }\r\r     void Implements(char* List)\r    {\r              List[I_OnRehash] = List[I_OnGarbageCollect] = List[I_OnCleanup] = List[I_OnUserQuit] = List[I_OnPostConnect] = List[I_OnUserPostNick] = List[I_On005Numeric] = 1;\r      }\r\r     virtual void OnUserQuit(userrec* user, const std::string &reason, const std::string &oper_message)\r     {\r              watchentries::iterator x = whos_watching_me->find(user->nick);\r         if (x != whos_watching_me->end())\r              {\r                      for (std::deque<userrec*>::iterator n = x->second.begin(); n != x->second.end(); n++)\r                  {\r                              if (!user->Visibility || user->Visibility->VisibleTo(user))\r                                    (*n)->WriteServ("601 %s %s %s %s %lu :went offline", (*n)->nick ,user->nick, user->ident, user->dhost, ServerInstance->Time());\r\r                               watchlist* wl;\r                         if ((*n)->GetExt("watchlist", wl))\r                                     /* We were on somebody's notify list, set ourselves offline */\r                                 (*wl)[user->nick] = "";\r                        }\r              }\r\r             /* Now im quitting, if i have a notify list, im no longer watching anyone */\r           watchlist* wl;\r         if (user->GetExt("watchlist", wl))\r             {\r                      /* Iterate every user on my watch list, and take me out of the whos_watching_me map for each one we're watching */\r                     for (watchlist::iterator i = wl->begin(); i != wl->end(); i++)\r                 {\r                              watchentries::iterator x = whos_watching_me->find(i->first);\r                           if (x != whos_watching_me->end())\r                              {\r                                              /* People are watching this user, am i one of them? */\r                                         std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);\r                                                if (n != x->second.end())\r                                                      /* I'm no longer watching you... */\r                                                    x->second.erase(n);\r    \r                                               if (!x->second.size())\r                                                 whos_watching_me->erase(user->nick);\r                           }\r                      }\r\r                     /* User's quitting, we're done with this. */\r                   delete wl;\r             }\r      }\r\r     virtual void OnGarbageCollect()\r        {\r              watchentries* old_watch = whos_watching_me;\r            whos_watching_me = new watchentries();\r\r                for (watchentries::const_iterator n = old_watch->begin(); n != old_watch->end(); n++)\r                  whos_watching_me->insert(*n);\r\r         delete old_watch;\r      }\r\r     virtual void OnCleanup(int target_type, void* item)\r    {\r              if (target_type == TYPE_USER)\r          {\r                      watchlist* wl;\r                 userrec* user = (userrec*)item;\r\r                       if (user->GetExt("watchlist", wl))\r                     {\r                              user->Shrink("watchlist");\r                             delete wl;\r                     }\r              }\r      }\r\r     virtual void OnPostConnect(userrec* user)\r      {\r              watchentries::iterator x = whos_watching_me->find(user->nick);\r         if (x != whos_watching_me->end())\r              {\r                      for (std::deque<userrec*>::iterator n = x->second.begin(); n != x->second.end(); n++)\r                  {\r                              if (!user->Visibility || user->Visibility->VisibleTo(user))\r                                    (*n)->WriteServ("600 %s %s %s %s %lu :arrived online", (*n)->nick, user->nick, user->ident, user->dhost, user->age);\r\r                          watchlist* wl;\r                         if ((*n)->GetExt("watchlist", wl))\r                                     /* We were on somebody's notify list, set ourselves online */\r                                  (*wl)[user->nick] = std::string(user->ident).append(" ").append(user->dhost).append(" ").append(ConvToStr(user->age));\r                 }\r              }\r      }\r\r     virtual void OnUserPostNick(userrec* user, const std::string &oldnick)\r {\r              watchentries::iterator new_online = whos_watching_me->find(user->nick);\r                watchentries::iterator new_offline = whos_watching_me->find(assign(oldnick));\r\r         if (new_online != whos_watching_me->end())\r             {\r                      for (std::deque<userrec*>::iterator n = new_online->second.begin(); n != new_online->second.end(); n++)\r                        {\r                              watchlist* wl;\r                         if ((*n)->GetExt("watchlist", wl))\r                             {\r                                      (*wl)[user->nick] = std::string(user->ident).append(" ").append(user->dhost).append(" ").append(ConvToStr(user->age));\r                                 if (!user->Visibility || user->Visibility->VisibleTo(user))\r                                            (*n)->WriteServ("600 %s %s %s :arrived online", (*n)->nick, user->nick, (*wl)[user->nick].c_str());\r                            }\r                      }\r              }\r\r             if (new_offline != whos_watching_me->end())\r            {\r                      for (std::deque<userrec*>::iterator n = new_offline->second.begin(); n != new_offline->second.end(); n++)\r                      {\r                              watchlist* wl;\r                         if ((*n)->GetExt("watchlist", wl))\r                             {\r                                      if (!user->Visibility || user->Visibility->VisibleTo(user))\r                                            (*n)->WriteServ("601 %s %s %s %s %lu :went offline", (*n)->nick, oldnick.c_str(), user->ident, user->dhost, user->age);\r                                        (*wl)[oldnick.c_str()] = "";\r                           }\r                      }\r              }\r      }       \r\r      virtual void On005Numeric(std::string &output)\r {\r              // we don't really have a limit...\r             output = output + " WATCH=" + ConvToStr(maxwatch);\r     }\r      \r       virtual ~Modulewatch()\r {\r              delete whos_watching_me;\r       }\r      \r       virtual Version GetVersion()\r   {\r              return Version(1,1,0,1,VF_VENDOR,API_VERSION);\r }\r};\r\rMODULE_INIT(Modulewatch)\r\r
\ No newline at end of file
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2019 Robby <robby@chatbelgie.be>
+ *   Copyright (C) 2017-2018 Sadie Powell <sadie@witchery.services>
+ *   Copyright (C) 2016 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/away.h"
+
+#define INSPIRCD_MONITOR_MANAGER_ONLY
+#include "m_monitor.cpp"
+
+enum
+{
+       RPL_GONEAWAY = 598,
+       RPL_NOTAWAY = 599,
+       RPL_LOGON = 600,
+       RPL_LOGOFF = 601,
+       RPL_WATCHOFF = 602,
+       RPL_WATCHSTAT = 603,
+       RPL_NOWON = 604,
+       RPL_NOWOFF = 605,
+       RPL_WATCHLIST = 606,
+       RPL_ENDOFWATCHLIST = 607,
+       // RPL_CLEARWATCH = 608, // unused
+       RPL_NOWISAWAY = 609,
+       ERR_TOOMANYWATCH = 512,
+       ERR_INVALIDWATCHNICK = 942
+};
+
+class CommandWatch : public SplitCommand
+{
+       // Additional penalty for /WATCH commands that request a list from the server
+       static const unsigned int ListPenalty = 4000;
+
+       IRCv3::Monitor::Manager& manager;
+
+       static void SendOnlineOffline(LocalUser* user, const std::string& nick, bool show_offline = true)
+       {
+               User* target = IRCv3::Monitor::Manager::FindNick(nick);
+               if (target)
+               {
+                       // The away state should only be sent if the client requests away notifications for a nick but 2.0 always sends them so we do that too
+                       if (target->IsAway())
+                               user->WriteNumeric(RPL_NOWISAWAY, target->nick, target->ident, target->GetDisplayedHost(), (unsigned long)target->awaytime, "is away");
+                       else
+                               user->WriteNumeric(RPL_NOWON, target->nick, target->ident, target->GetDisplayedHost(), (unsigned long)target->age, "is online");
+               }
+               else if (show_offline)
+                       user->WriteNumeric(RPL_NOWOFF, nick, "*", "*", "0", "is offline");
+       }
+
+       void HandlePlus(LocalUser* user, const std::string& nick)
+       {
+               IRCv3::Monitor::Manager::WatchResult result = manager.Watch(user, nick, maxwatch);
+               if (result == IRCv3::Monitor::Manager::WR_TOOMANY)
+               {
+                       // List is full, send error numeric
+                       user->WriteNumeric(ERR_TOOMANYWATCH, nick, "Too many WATCH entries");
+                       return;
+               }
+               else if (result == IRCv3::Monitor::Manager::WR_INVALIDNICK)
+               {
+                       user->WriteNumeric(ERR_INVALIDWATCHNICK, nick, "Invalid nickname");
+                       return;
+               }
+               else if (result != IRCv3::Monitor::Manager::WR_OK)
+                       return;
+
+               SendOnlineOffline(user, nick);
+       }
+
+       void HandleMinus(LocalUser* user, const std::string& nick)
+       {
+               if (!manager.Unwatch(user, nick))
+                       return;
+
+               User* target = IRCv3::Monitor::Manager::FindNick(nick);
+               if (target)
+                       user->WriteNumeric(RPL_WATCHOFF, target->nick, target->ident, target->GetDisplayedHost(), (unsigned long)target->age, "stopped watching");
+               else
+                       user->WriteNumeric(RPL_WATCHOFF, nick, "*", "*", "0", "stopped watching");
+       }
+
+       void HandleList(LocalUser* user, bool show_offline)
+       {
+               user->CommandFloodPenalty += ListPenalty;
+               const IRCv3::Monitor::WatchedList& list = manager.GetWatched(user);
+               for (IRCv3::Monitor::WatchedList::const_iterator i = list.begin(); i != list.end(); ++i)
+               {
+                       const IRCv3::Monitor::Entry* entry = *i;
+                       SendOnlineOffline(user, entry->GetNick(), show_offline);
+               }
+               user->WriteNumeric(RPL_ENDOFWATCHLIST, "End of WATCH list");
+       }
+
+       void HandleStats(LocalUser* user)
+       {
+               user->CommandFloodPenalty += ListPenalty;
+
+               // Do not show how many clients are watching this nick, it's pointless
+               const IRCv3::Monitor::WatchedList& list = manager.GetWatched(user);
+               user->WriteNumeric(RPL_WATCHSTAT, InspIRCd::Format("You have %lu and are on 0 WATCH entries", (unsigned long)list.size()));
+
+               Numeric::Builder<' '> out(user, RPL_WATCHLIST);
+               for (IRCv3::Monitor::WatchedList::const_iterator i = list.begin(); i != list.end(); ++i)
+               {
+                       const IRCv3::Monitor::Entry* entry = *i;
+                       out.Add(entry->GetNick());
+               }
+               out.Flush();
+               user->WriteNumeric(RPL_ENDOFWATCHLIST, "End of WATCH S");
+       }
+
+ public:
+       unsigned int maxwatch;
+
+       CommandWatch(Module* mod, IRCv3::Monitor::Manager& managerref)
+               : SplitCommand(mod, "WATCH")
+               , manager(managerref)
+       {
+               allow_empty_last_param = false;
+               syntax = "C|L|l|S|(+|-)<nick> [(+|-)<nick>]+";
+       }
+
+       CmdResult HandleLocal(LocalUser* user, const Params& parameters) CXX11_OVERRIDE
+       {
+               if (parameters.empty())
+               {
+                       HandleList(user, false);
+                       return CMD_SUCCESS;
+               }
+
+               bool watch_l_done = false;
+               bool watch_s_done = false;
+
+               for (std::vector<std::string>::const_iterator i = parameters.begin(); i != parameters.end(); ++i)
+               {
+                       const std::string& token = *i;
+                       char subcmd = toupper(token[0]);
+                       if (subcmd == '+')
+                       {
+                               HandlePlus(user, token.substr(1));
+                       }
+                       else if (subcmd == '-')
+                       {
+                               HandleMinus(user, token.substr(1));
+                       }
+                       else if (subcmd == 'C')
+                       {
+                               manager.UnwatchAll(user);
+                       }
+                       else if ((subcmd == 'L') && (!watch_l_done))
+                       {
+                               watch_l_done = true;
+                               // WATCH L requests a full list with online and offline nicks
+                               // WATCH l requests a list with only online nicks
+                               HandleList(user, (token[0] == 'L'));
+                       }
+                       else if ((subcmd == 'S') && (!watch_s_done))
+                       {
+                               watch_s_done = true;
+                               HandleStats(user);
+                       }
+               }
+               return CMD_SUCCESS;
+       }
+};
+
+class ModuleWatch
+       : public Module
+       , public Away::EventListener
+{
+       IRCv3::Monitor::Manager manager;
+       CommandWatch cmd;
+
+       void SendAlert(User* user, const std::string& nick, unsigned int numeric, const char* numerictext, time_t shownts)
+       {
+               const IRCv3::Monitor::WatcherList* list = manager.GetWatcherList(nick);
+               if (!list)
+                       return;
+
+               Numeric::Numeric num(numeric);
+               num.push(nick).push(user->ident).push(user->GetDisplayedHost()).push(ConvToStr(shownts)).push(numerictext);
+               for (IRCv3::Monitor::WatcherList::const_iterator i = list->begin(); i != list->end(); ++i)
+               {
+                       LocalUser* curr = *i;
+                       curr->WriteNumeric(num);
+               }
+       }
+
+       void Online(User* user)
+       {
+               SendAlert(user, user->nick, RPL_LOGON, "arrived online", user->age);
+       }
+
+       void Offline(User* user, const std::string& nick)
+       {
+               SendAlert(user, nick, RPL_LOGOFF, "went offline", user->age);
+       }
+
+ public:
+       ModuleWatch()
+               : Away::EventListener(this)
+               , manager(this, "watch")
+               , cmd(this, manager)
+       {
+       }
+
+       void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
+       {
+               ConfigTag* tag = ServerInstance->Config->ConfValue("watch");
+               cmd.maxwatch = tag->getUInt("maxwatch", 30, 1);
+       }
+
+       void OnPostConnect(User* user) CXX11_OVERRIDE
+       {
+               Online(user);
+       }
+
+       void OnUserPostNick(User* user, const std::string& oldnick) CXX11_OVERRIDE
+       {
+               // Detect and ignore nickname case change
+               if (ServerInstance->FindNickOnly(oldnick) == user)
+                       return;
+
+               Offline(user, oldnick);
+               Online(user);
+       }
+
+       void OnUserQuit(User* user, const std::string& message, const std::string& oper_message) CXX11_OVERRIDE
+       {
+               LocalUser* localuser = IS_LOCAL(user);
+               if (localuser)
+                       manager.UnwatchAll(localuser);
+               Offline(user, user->nick);
+       }
+
+       void OnUserAway(User* user) CXX11_OVERRIDE
+       {
+               SendAlert(user, user->nick, RPL_GONEAWAY, user->awaymsg.c_str(), user->awaytime);
+       }
+
+       void OnUserBack(User* user) CXX11_OVERRIDE
+       {
+               SendAlert(user, user->nick, RPL_NOTAWAY, "is no longer away", ServerInstance->Time());
+       }
+
+       void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
+       {
+               tokens["WATCH"] = ConvToStr(cmd.maxwatch);
+       }
+
+       Version GetVersion() CXX11_OVERRIDE
+       {
+               return Version("Adds the /WATCH command which allows users to find out when their friends are connected to the server.", VF_VENDOR);
+       }
+};
+
+MODULE_INIT(ModuleWatch)