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-/*       +------------------------------------+
- *       | Inspire Internet Relay Chat Daemon |
- *       +------------------------------------+
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
  *
- *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
- *       E-mail:
- *<brain@chatspike.net>
- *       <Craig@chatspike.net>
- *     
- * Written by Craig Edwards, Craig McLure, and others.
- * This program is free but copyrighted software; see
- *    the file COPYING for details.
+ *   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/>.
  */
 
-using namespace std;
 
-#include <stdio.h>
-#include <string>
-#include <vector>
-#include "users.h"
-#include "channels.h"
-#include "modules.h"
-#include "hashcomp.h"
 #include "inspircd.h"
+#include "modules/away.h"
 
-/* $ModDesc: Provides support for the /watch command */
+#define INSPIRCD_MONITOR_MANAGER_ONLY
+#include "m_monitor.cpp"
 
-/*                       nickname     list of users watching the nick                       */
-typedef nspace::hash_map<irc::string, std::deque<userrec*>, nspace::hash<irc::string> >     watchentries;
+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
+};
 
-/*               nickname    'ident host signon', or empty if not online                    */
-typedef std::map<irc::string, std::string>                                                  watchlist;
+class CommandWatch : public SplitCommand
+{
+       // Additional penalty for /WATCH commands that request a list from the server
+       static const unsigned int ListPenalty = 4000;
 
-/* Whos watching each nickname */
-watchentries whos_watching_me;
+       IRCv3::Monitor::Manager& manager;
 
-/** Handle /WATCH
- */
-class cmd_watch : public command_t
-{
-       unsigned int& MAX_WATCH;
- public:
-       CmdResult remove_watch(userrec* user, const char* nick)
+       static void SendOnlineOffline(LocalUser* user, const std::string& nick, bool show_offline = true)
        {
-               // removing an item from the list
-               if (!ServerInstance->IsNick(nick))
+               User* target = IRCv3::Monitor::Manager::FindNick(nick);
+               if (target)
                {
-                       user->WriteServ("942 %s %s :Invalid nickname", user->nick, nick);
-                       return CMD_FAILURE;
+                       // 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");
+       }
 
-               watchlist* wl;
-               if (user->GetExt("watchlist", wl))
+       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)
                {
-                       /* Yup, is on my list */
-                       watchlist::iterator n = wl->find(nick);
-                       if (n != wl->end())
-                       {
-                               if (!n->second.empty())
-                                       user->WriteServ("602 %s %s %s :stopped watching", user->nick, n->first.c_str(), n->second.c_str());
-                               else
-                                       user->WriteServ("602 %s %s * * 0 :stopped watching", user->nick, nick);
-
-                               wl->erase(n);
-                       }
+                       // 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;
 
-                       if (!wl->size())
-                       {
-                               user->Shrink("watchlist");
-                               delete wl;
-                       }
+               SendOnlineOffline(user, nick);
+       }
 
-                       watchentries::iterator x = whos_watching_me.find(nick);
-                       if (x != whos_watching_me.end())
-                       {
-                               /* People are watching this user, am i one of them? */
-                               std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);
-                               if (n != x->second.end())
-                                       /* I'm no longer watching you... */
-                                       x->second.erase(n);
-
-                               if (!x->second.size())
-                                       whos_watching_me.erase(nick);
-                       }
-               }
+       void HandleMinus(LocalUser* user, const std::string& nick)
+       {
+               if (!manager.Unwatch(user, nick))
+                       return;
 
-               /* This might seem confusing, but we return CMD_FAILURE
-                * to indicate that this message shouldnt be routed across
-                * the network to other linked servers.
-                */
-               return CMD_FAILURE;
+               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");
        }
 
-       CmdResult add_watch(userrec* user, const char* nick)
+       void HandleList(LocalUser* user, bool show_offline)
        {
-               if (!ServerInstance->IsNick(nick))
+               user->CommandFloodPenalty += ListPenalty;
+               const IRCv3::Monitor::WatchedList& list = manager.GetWatched(user);
+               for (IRCv3::Monitor::WatchedList::const_iterator i = list.begin(); i != list.end(); ++i)
                {
-                       user->WriteServ("942 %s %s :Invalid nickname",user->nick,nick);
-                       return CMD_FAILURE;
+                       const IRCv3::Monitor::Entry* entry = *i;
+                       SendOnlineOffline(user, entry->GetNick(), show_offline);
                }
+               user->WriteNumeric(RPL_ENDOFWATCHLIST, "End of WATCH list");
+       }
 
-               watchlist* wl;
-               if (!user->GetExt("watchlist", wl))
+       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)
                {
-                       ServerInstance->Log(DEBUG,"Allocate new watchlist");
-                       wl = new watchlist();
-                       user->Extend("watchlist", wl);
+                       const IRCv3::Monitor::Entry* entry = *i;
+                       out.Add(entry->GetNick());
                }
+               out.Flush();
+               user->WriteNumeric(RPL_ENDOFWATCHLIST, "End of WATCH S");
+       }
+
+ public:
+       unsigned int maxwatch;
 
-               if (wl->size() == MAX_WATCH)
+       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())
                {
-                       user->WriteServ("512 %s %s :Too many WATCH entries", user->nick, nick);
-                       return CMD_FAILURE;
+                       HandleList(user, false);
+                       return CMD_SUCCESS;
                }
 
-               watchlist::iterator n = wl->find(nick);
-               if (n == wl->end())
+               bool watch_l_done = false;
+               bool watch_s_done = false;
+
+               for (std::vector<std::string>::const_iterator i = parameters.begin(); i != parameters.end(); ++i)
                {
-                       ServerInstance->Log(DEBUG,"*** Add to WATCH: '%s'", nick);
-                       /* Don't already have the user on my watch list, proceed */
-                       watchentries::iterator x = whos_watching_me.find(nick);
-                       if (x != whos_watching_me.end())
+                       const std::string& token = *i;
+                       char subcmd = toupper(token[0]);
+                       if (subcmd == '+')
                        {
-                               /* People are watching this user, add myself */
-                               x->second.push_back(user);
+                               HandlePlus(user, token.substr(1));
                        }
-                       else
+                       else if (subcmd == '-')
                        {
-                               std::deque<userrec*> newlist;
-                               newlist.push_back(user);
-                               whos_watching_me[nick] = newlist;
+                               HandleMinus(user, token.substr(1));
                        }
-
-                       userrec* target = ServerInstance->FindNick(nick);
-                       if (target)
+                       else if (subcmd == 'C')
                        {
-                               (*wl)[nick] = std::string(target->ident).append(" ").append(target->dhost).append(" ").append(ConvToStr(target->age));
-                               user->WriteServ("604 %s %s %s :is online",user->nick, nick, (*wl)[nick].c_str());
+                               manager.UnwatchAll(user);
                        }
-                       else
+                       else if ((subcmd == 'L') && (!watch_l_done))
                        {
-                               (*wl)[nick] = "";
-                               user->WriteServ("605 %s %s * * 0 :is offline",user->nick, nick);
+                               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
-               {
-                       ServerInstance->Log(DEBUG,"*** WATCH entry '%s' already exists!", nick);
-               }
-
-               return CMD_FAILURE;
-       }
-
-       cmd_watch (InspIRCd* Instance, unsigned int &maxwatch) : command_t(Instance,"WATCH",0,0), MAX_WATCH(maxwatch)
-       {
-               this->source = "m_watch.so";
-               syntax = "[C|L|S]|[+|-<nick>]";
-       }
-
-       CmdResult Handle (const char** parameters, int pcnt, userrec *user)
-       {
-               if (!pcnt)
-               {
-                       watchlist* wl;
-                       if (user->GetExt("watchlist", wl))
+                       else if ((subcmd == 'S') && (!watch_s_done))
                        {
-                               for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
-                               {
-                                       if (!q->second.empty())
-                                               user->WriteServ("604 %s %s %s :is online", user->nick, q->first.c_str(), q->second.c_str());
-                               }
+                               watch_s_done = true;
+                               HandleStats(user);
                        }
-                       user->WriteServ("607 %s :End of WATCH list",user->nick);
                }
-               else if (pcnt > 0)
-               {
-                       for (int x = 0; x < pcnt; x++)
-                       {
-                               const char *nick = parameters[x];
-                               ServerInstance->Log(DEBUG,"WATCH iterate item '%s'", nick);
-                               if (!strcasecmp(nick,"C"))
-                               {
-                                       // watch clear
-                                       watchlist* wl;
-                                       if (user->GetExt("watchlist", wl))
-                                       {
-                                               for (watchlist::iterator i = wl->begin(); i != wl->end(); i++)
-                                               {
-                                                       watchentries::iterator x = whos_watching_me.find(i->first);
-                                                       if (x != whos_watching_me.end())
-                                                       {
-                                                               /* People are watching this user, am i one of them? */
-                                                               std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);
-                                                               if (n != x->second.end())
-                                                                       /* I'm no longer watching you... */
-                                                                       x->second.erase(n);
-
-                                                               if (!x->second.size())
-                                                                       whos_watching_me.erase(user->nick);
-                                                       }
-                                               }
-
-                                               delete wl;
-                                               user->Shrink("watchlist");
-                                       }
-                               }
-                               else if (!strcasecmp(nick,"L"))
-                               {
-                                       watchlist* wl;
-                                       if (user->GetExt("watchlist", wl))
-                                       {
-                                               for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
-                                               {
-                                                       if (!q->second.empty())
-                                                               user->WriteServ("604 %s %s %s :is online", user->nick, q->first.c_str(), q->second.c_str());
-                                                       else
-                                                               user->WriteServ("605 %s %s * * 0 :is offline", user->nick, q->first.c_str());
-                                               }
-                                       }
-                                       user->WriteServ("607 %s :End of WATCH list",user->nick);
-                               }
-                               else if (!strcasecmp(nick,"S"))
-                               {
-                                       watchlist* wl;
-                                       int you_have = 0;
-                                       int youre_on = 0;
-                                       std::string list;
-
-                                       if (user->GetExt("watchlist", wl))
-                                       {
-                                               for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
-                                                       list.append(q->first.c_str()).append(" ");
-                                               you_have = wl->size();
-                                       }
-
-                                       watchentries::iterator x = whos_watching_me.find(user->nick);
-                                       if (x != whos_watching_me.end())
-                                               youre_on = x->second.size();
-
-                                       user->WriteServ("603 %s :You have %d and are on %d WATCH entries", user->nick, you_have, youre_on);
-                                       user->WriteServ("606 %s :%s",user->nick, list.c_str());
-                                       user->WriteServ("607 %s :End of WATCH S",user->nick);
-                               }
-                               else if (nick[0] == '-')
-                               {
-                                       nick++;
-                                       remove_watch(user, nick);
-                               }
-                               else if (nick[0] == '+')
-                               {
-                                       nick++;
-                                       add_watch(user, nick);
-                               }
-                       }
-               }
-               /* So that spanningtree doesnt pass the WATCH commands to the network! */
-               return CMD_FAILURE;
+               return CMD_SUCCESS;
        }
 };
 
-class Modulewatch : public Module
+class ModuleWatch
+       : public Module
+       , public Away::EventListener
 {
-       cmd_watch* mycommand;
-       unsigned int maxwatch;
- public:
+       IRCv3::Monitor::Manager manager;
+       CommandWatch cmd;
 
-       Modulewatch(InspIRCd* Me)
-               : Module::Module(Me), maxwatch(32)
+       void SendAlert(User* user, const std::string& nick, unsigned int numeric, const char* numerictext, time_t shownts)
        {
-               mycommand = new cmd_watch(ServerInstance, maxwatch);
-               ServerInstance->AddCommand(mycommand);
+               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 Implements(char* List)
+       void Online(User* user)
        {
-               List[I_OnUserQuit] = List[I_OnPostConnect] = List[I_OnUserPostNick] = List[I_On005Numeric] = 1;
+               SendAlert(user, user->nick, RPL_LOGON, "arrived online", user->age);
        }
 
-       virtual void OnUserQuit(userrec* user, const std::string &reason)
+       void Offline(User* user, const std::string& nick)
        {
-               ServerInstance->Log(DEBUG,"*** WATCH: On global quit: user %s",user->nick);
-               watchentries::iterator x = whos_watching_me.find(user->nick);
-               if (x != whos_watching_me.end())
-               {
-                       for (std::deque<userrec*>::iterator n = x->second.begin(); n != x->second.end(); n++)
-                       {
-                               (*n)->WriteServ("601 %s %s %s %s %lu :went offline", (*n)->nick ,user->nick, user->ident, user->dhost, ServerInstance->Time());
-                               watchlist* wl;
-                               if ((*n)->GetExt("watchlist", wl))
-                                       /* We were on somebody's notify list, set ourselves offline */
-                                       (*wl)[user->nick] = "";
-                       }
-               }
-
-               /* Now im quitting, if i have a notify list, im no longer watching anyone */
-               watchlist* wl;
-               if (user->GetExt("watchlist", wl))
-               {
-                       /* Iterate every user on my watch list, and take me out of the whos_watching_me map for each one we're watching */
-                       for (watchlist::iterator i = wl->begin(); i != wl->end(); i++)
-                       {
-                               watchentries::iterator x = whos_watching_me.find(i->first);
-                               if (x != whos_watching_me.end())
-                               {
-                                               /* People are watching this user, am i one of them? */
-                                               std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);
-                                               if (n != x->second.end())
-                                                       /* I'm no longer watching you... */
-                                                       x->second.erase(n);
-       
-                                               if (!x->second.size())
-                                                       whos_watching_me.erase(user->nick);
-                               }
-                       }
-               }
+               SendAlert(user, nick, RPL_LOGOFF, "went offline", user->age);
        }
 
-       virtual void OnPostConnect(userrec* user)
+ public:
+       ModuleWatch()
+               : Away::EventListener(this)
+               , manager(this, "watch")
+               , cmd(this, manager)
        {
-               ServerInstance->Log(DEBUG,"*** WATCH: On global connect: user %s",user->nick);
-               watchentries::iterator x = whos_watching_me.find(user->nick);
-               if (x != whos_watching_me.end())
-               {
-                       for (std::deque<userrec*>::iterator n = x->second.begin(); n != x->second.end(); n++)
-                       {
-                               (*n)->WriteServ("600 %s %s %s %s %lu :arrived online", (*n)->nick, user->nick, user->ident, user->dhost, user->age);
-                               watchlist* wl;
-                               if ((*n)->GetExt("watchlist", wl))
-                                       /* We were on somebody's notify list, set ourselves online */
-                                       (*wl)[user->nick] = std::string(user->ident).append(" ").append(user->dhost).append(" ").append(ConvToStr(user->age));
-                       }
-               }
        }
 
-       virtual void OnUserPostNick(userrec* user, const std::string &oldnick)
+       void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
        {
-               ServerInstance->Log(DEBUG,"*** WATCH: On global nickchange: old nick: %s new nick: %s",oldnick.c_str(),user->nick);
-
-               watchentries::iterator new_online = whos_watching_me.find(user->nick);
-               watchentries::iterator new_offline = whos_watching_me.find(assign(oldnick));
-
-               if (new_online != whos_watching_me.end())
-               {
-                       for (std::deque<userrec*>::iterator n = new_online->second.begin(); n != new_online->second.end(); n++)
-                       {
-                               watchlist* wl;
-                               if ((*n)->GetExt("watchlist", wl))
-                               {
-                                       (*wl)[user->nick] = std::string(user->ident).append(" ").append(user->dhost).append(" ").append(ConvToStr(user->age));
-                                       (*n)->WriteServ("600 %s %s %s :arrived online", (*n)->nick, user->nick, (*wl)[user->nick].c_str());
-                               }
-                       }
-               }
-
-               if (new_offline != whos_watching_me.end())
-               {
-                       for (std::deque<userrec*>::iterator n = new_offline->second.begin(); n != new_offline->second.end(); n++)
-                       {
-                               watchlist* wl;
-                               if ((*n)->GetExt("watchlist", wl))
-                               {
-                                       /*ServerInstance->Log(DEBUG,"nick=%s", (*n)->nick);
-                                       ServerInstance->Log(DEBUG,"nick2=%s", user->nick);*/
-                                       (*n)->WriteServ("601 %s %s %s %s %lu :went offline", (*n)->nick, oldnick.c_str(), user->ident, user->dhost, user->age);
-                                       (*wl)[user->nick] = "";
-                               }
-                       }
-               }
-       }       
+               ConfigTag* tag = ServerInstance->Config->ConfValue("watch");
+               cmd.maxwatch = tag->getUInt("maxwatch", 30, 1);
+       }
 
-       virtual void On005Numeric(std::string &output)
+       void OnPostConnect(User* user) CXX11_OVERRIDE
        {
-               // we don't really have a limit...
-               output = output + " WATCH=32";
+               Online(user);
        }
-       
-       virtual ~Modulewatch()
+
+       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);
        }
-       
-       virtual Version GetVersion()
+
+       void OnUserQuit(User* user, const std::string& message, const std::string& oper_message) CXX11_OVERRIDE
        {
-               return Version(1,1,0,1,VF_VENDOR,API_VERSION);
+               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);
+       }
 
-class ModulewatchFactory : public ModuleFactory
-{
- public:
-       ModulewatchFactory()
+       void OnUserBack(User* user) CXX11_OVERRIDE
        {
+               SendAlert(user, user->nick, RPL_NOTAWAY, "is no longer away", ServerInstance->Time());
        }
-       
-       ~ModulewatchFactory()
+
+       void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
        {
+               tokens["WATCH"] = ConvToStr(cmd.maxwatch);
        }
-       
-       virtual Module * CreateModule(InspIRCd* Me)
+
+       Version GetVersion() CXX11_OVERRIDE
        {
-               return new Modulewatch(Me);
+               return Version("Adds the /WATCH command which allows users to find out when their friends are connected to the server.", VF_VENDOR);
        }
-       
 };
 
-
-extern "C" void * init_module( void )
-{
-       return new ModulewatchFactory;
-}
-
+MODULE_INIT(ModuleWatch)