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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 "helperfuncs.h"
-#include "hashcomp.h"
 
-/* $ModDesc: Provides support for the /watch command */
+#include "inspircd.h"
+#include "modules/away.h"
 
-static Server *Srv;
+#define INSPIRCD_MONITOR_MANAGER_ONLY
+#include "m_monitor.cpp"
 
-class watchentry
+enum
 {
- public:
-       userrec* watcher;
-       std::string target;
+       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
 };
 
-typedef std::vector<watchentry> watchlist;
-watchlist watches;
-
-class cmd_watch : public command_t
+class CommandWatch : public SplitCommand
 {
- public:
-       cmd_watch() : command_t("WATCH",0,0)
+       // 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)
        {
-               this->source = "m_watch.so";
+               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 Handle (char **parameters, int pcnt, userrec *user)
+       void HandlePlus(LocalUser* user, const std::string& nick)
        {
-               if (!pcnt)
+               IRCv3::Monitor::Manager::WatchResult result = manager.Watch(user, nick, maxwatch);
+               if (result == IRCv3::Monitor::Manager::WR_TOOMANY)
                {
-                       for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
-                       {
-                               if (q->watcher == user)
-                               {
-                                       userrec* targ = Srv->FindNick(q->target);
-                                       if (targ)
-                                       {
-                                               WriteServ(user->fd,"604 %s %s %s %s %lu :is online",user->nick,targ->nick,targ->ident,targ->dhost,targ->age);
-                                       }
-                               }
-                       }
-                       WriteServ(user->fd,"607 %s :End of WATCH list",user->nick);
+                       // List is full, send error numeric
+                       user->WriteNumeric(ERR_TOOMANYWATCH, nick, "Too many WATCH entries");
+                       return;
                }
-               else if (pcnt > 0)
+               else if (result == IRCv3::Monitor::Manager::WR_INVALIDNICK)
                {
-                       for (int x = 0; x < pcnt; x++)
-                       {
-                               char *nick = parameters[x];
-                               if (!strcasecmp(nick,"C"))
-                               {
-                                       // watch clear
-                                       bool done = false;
-                                       while (!done)
-                                       {
-                                               done = true;
-                                               for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
-                                               {
-                                                       if (q->watcher == user)
-                                                       {
-                                                               done = false;
-                                                               watches.erase(q);
-                                                               break;
-                                                       }
-                                               }
-                                       }
-                               }
-                               else if (!strcasecmp(nick,"L"))
-                               {
-                                       for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
-                                       {
-                                               if (q->watcher == user)
-                                               {
-                                                       userrec* targ = Srv->FindNick(q->target);
-                                                       if (targ)
-                                                       {
-                                                               WriteServ(user->fd,"604 %s %s %s %s %lu :is online",user->nick,targ->nick,targ->ident,targ->dhost,targ->age);
-                                                       }
-                                               }
-                                       }
-                                       WriteServ(user->fd,"607 %s :End of WATCH list",user->nick);
-                               }
-                               else if (!strcasecmp(nick,"S"))
-                               {
-                                       std::string list = "";
-                                       for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
-                                       {
-                                               if (q->watcher == user)
-                                               {
-                                                       list = list + " " + q->target;
-                                               }
-                                       }
-                                       char* l = (char*)list.c_str();
-                                       if (*l == ' ')
-                                               l++;
-                                       WriteServ(user->fd,"606 %s :%s",user->nick,l);
-                                       WriteServ(user->fd,"607 %s :End of WATCH S",user->nick);
-                               }
-                               else if (nick[0] == '-')
-                               {
-                                       // removing an item from the list
-                                       nick++;
-                                       irc::string n1 = nick;
-                                       for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
-                                       {
-                                               if (q->watcher == user)
-                                               {
-                                                       irc::string n2 = q->target.c_str();
-                                                       userrec* a = Srv->FindNick(q->target);
-                                                       if (a)
-                                                       {
-                                                               WriteServ(user->fd,"602 %s %s %s %s %lu :stopped watching",user->nick,a->nick,a->ident,a->dhost,a->age);
-                                                       }
-                                                       else
-                                                       {
-                                                                WriteServ(user->fd,"602 %s %s * * 0 :stopped watching",user->nick,q->target.c_str());
-                                                       }
-                                                       if (n1 == n2)
-                                                       {
-                                                               watches.erase(q);
-                                                               break;
-                                                       }
-                                               }
-                                       }
-                               }
-                               else if (nick[0] == '+')
-                               {
-                                       nick++;
-                                       irc::string n1 = nick;
-                                       bool exists = false;
-                                       for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
-                                       {
-                                               if (q->watcher == user)
-                                               {
-                                                       irc::string n2 = q->target.c_str();
-                                                       if (n1 == n2)
-                                                       {
-                                                               // already on watch list
-                                                               exists = true;
-                                                       }
-                                               }
-                                       }
-                                       if (!exists)
-                                       {
-                                               watchentry w;
-                                               w.watcher = user;
-                                               w.target = nick;
-                                               watches.push_back(w);
-                                               log(DEBUG,"*** Added %s to watchlist of %s",nick,user->nick);
-                                       }
-                                       userrec* a = Srv->FindNick(nick);
-                                       if (a)
-                                       {
-                                               WriteServ(user->fd,"604 %s %s %s %s %lu :is online",user->nick,a->nick,a->ident,a->dhost,a->age);
-                                       }
-                                       else
-                                       {
-                                               WriteServ(user->fd,"605 %s %s * * 0 :is offline",user->nick,nick);
-                                       }
-                               }
-                       }
+                       user->WriteNumeric(ERR_INVALIDWATCHNICK, nick, "Invalid nickname");
+                       return;
                }
-               return;
+               else if (result != IRCv3::Monitor::Manager::WR_OK)
+                       return;
+
+               SendOnlineOffline(user, nick);
        }
-};
 
-class Modulewatch : public Module
-{
-       cmd_watch* mycommand;
- public:
+       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");
+       }
 
-       Modulewatch(Server* Me)
-               : Module::Module(Me)
+       void HandleList(LocalUser* user, bool show_offline)
        {
-               Srv = Me;
-               mycommand = new cmd_watch();
-               Srv->AddCommand(mycommand);
+               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 Implements(char* List)
+       void HandleStats(LocalUser* user)
        {
-               List[I_OnUserQuit] = List[I_OnGlobalConnect] = List[I_OnUserPostNick] = List[I_On005Numeric] = 1;
+               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");
        }
 
-       virtual void OnUserQuit(userrec* user, std::string reason)
+ public:
+       unsigned int maxwatch;
+
+       CommandWatch(Module* mod, IRCv3::Monitor::Manager& managerref)
+               : SplitCommand(mod, "WATCH")
+               , manager(managerref)
        {
-               log(DEBUG,"*** WATCH: On global quit: user %s",user->nick);
-               irc::string n2 = user->nick;
-               for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
+               allow_empty_last_param = false;
+               syntax = "C|L|l|S|(+|-)<nick> [(+|-)<nick>]+";
+       }
+
+       CmdResult HandleLocal(LocalUser* user, const Params& parameters) CXX11_OVERRIDE
+       {
+               if (parameters.empty())
                {
-                       irc::string n1 = q->target.c_str();
-                       if (n1 == n2)
-                       {
-                               log(DEBUG,"*** WATCH: On global quit: user %s is in notify of %s",user->nick,q->watcher->nick);
-                               WriteServ(q->watcher->fd,"601 %s %s %s %s %lu :went offline",q->watcher->nick,user->nick,user->ident,user->dhost,time(NULL));
-                       }
+                       HandleList(user, false);
+                       return CMD_SUCCESS;
                }
-               bool done = false;
-               while (!done)
+
+               bool watch_l_done = false;
+               bool watch_s_done = false;
+
+               for (std::vector<std::string>::const_iterator i = parameters.begin(); i != parameters.end(); ++i)
                {
-                       done = true;
-                       for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
+                       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')
                        {
-                               if (q->watcher == user)
-                               {
-                                       done = false;
-                                       watches.erase(q);
-                                       break;
-                               }
+                               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;
        }
+};
 
-       virtual void OnGlobalConnect(userrec* user)
+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)
        {
-               irc::string n2 = user->nick;
-               log(DEBUG,"*** WATCH: On global connect: user %s",user->nick);
-               for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
+               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)
                {
-                       irc::string n1 = q->target.c_str();
-                       if (n1 == n2)
-                       {
-                               log(DEBUG,"*** WATCH: On global connect: user %s is in notify of %s",user->nick,q->watcher->nick);
-                               WriteServ(q->watcher->fd,"600 %s %s %s %s %lu :arrived online",q->watcher->nick,user->nick,user->ident,user->dhost,user->age);
-                       }
+                       LocalUser* curr = *i;
+                       curr->WriteNumeric(num);
                }
        }
 
-       virtual void OnUserPostNick(userrec* user, std::string oldnick)
+       void Online(User* user)
        {
-               irc::string n2 = oldnick.c_str();
-               irc::string n3 = user->nick;
-               log(DEBUG,"*** WATCH: On global nickchange: old nick: %s new nick: %s",oldnick.c_str(),user->nick);
-               for (watchlist::iterator q = watches.begin(); q != watches.end(); q++)
-               {
-                       irc::string n1 = q->target.c_str();
-                       // changed from a nick on the watchlist to one that isnt
-                       if (n1 == n2)
-                       {
-                               log(DEBUG,"*** WATCH: On global nickchange: old nick %s was on notify list of %s",oldnick.c_str(),q->watcher->nick);
-                               WriteServ(q->watcher->fd,"601 %s %s %s %s %lu :went offline",q->watcher->nick,oldnick.c_str(),user->ident,user->dhost,time(NULL));
-                       }
-                       else if (n1 == n3)
-                       {
-                               // changed from a nick not on notify to one that is
-                               log(DEBUG,"*** WATCH: On global nickchange: new nick %s is on notify list of %s",user->nick,q->watcher->nick);
-                               WriteServ(q->watcher->fd,"600 %s %s %s %s %lu :arrived online",q->watcher->nick,user->nick,user->ident,user->dhost,user->age);
-                       }
-               }
-       }       
+               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);
+       }
 
-       virtual void On005Numeric(std::string &output)
+ public:
+       ModuleWatch()
+               : Away::EventListener(this)
+               , manager(this, "watch")
+               , cmd(this, manager)
        {
-               // we don't really have a limit...
-               output = output + " WATCH=999";
        }
-       
-       virtual ~Modulewatch()
+
+       void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
        {
+               ConfigTag* tag = ServerInstance->Config->ConfValue("watch");
+               cmd.maxwatch = tag->getUInt("maxwatch", 30, 1);
        }
-       
-       virtual Version GetVersion()
+
+       void OnPostConnect(User* user) CXX11_OVERRIDE
        {
-               return Version(1,0,0,1,VF_VENDOR);
+               Online(user);
        }
-};
 
+       void OnUserPostNick(User* user, const std::string& oldnick) CXX11_OVERRIDE
+       {
+               // Detect and ignore nickname case change
+               if (ServerInstance->FindNickOnly(oldnick) == user)
+                       return;
 
-class ModulewatchFactory : public ModuleFactory
-{
- public:
-       ModulewatchFactory()
+               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);
        }
-       
-       ~ModulewatchFactory()
+
+       void OnUserAway(User* user) CXX11_OVERRIDE
        {
+               SendAlert(user, user->nick, RPL_GONEAWAY, user->awaymsg.c_str(), user->awaytime);
        }
-       
-       virtual Module * CreateModule(Server* Me)
+
+       void OnUserBack(User* user) CXX11_OVERRIDE
        {
-               return new Modulewatch(Me);
+               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);
+       }
 
-extern "C" void * init_module( void )
-{
-       return new ModulewatchFactory;
-}
+       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)