src/modules/m_topiclock.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2012 Attila Molnar <attilamolnar@hush.com>
   5  *
   6  * This file is part of InspIRCd.  InspIRCd is free software: you can
   7  * redistribute it and/or modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation, version 2.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "inspircd.h"
  20
  21 class CommandSVSTOPIC : public Command
  22 {
  23  public:
  24         CommandSVSTOPIC(Module* Creator)
  25                 : Command(Creator, "SVSTOPIC", 1, 4)
  26         {
  27                 flags_needed = FLAG_SERVERONLY;
  28         }
  29
  30         CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  31         {
  32                 if (!ServerInstance->ULine(user->server))
  33                 {
  34                         // Ulines only
  35                         return CMD_FAILURE;
  36                 }
  37
  38                 Channel* chan = ServerInstance->FindChan(parameters[0]);
  39                 if (!chan)
  40                         return CMD_FAILURE;
  41
  42                 if (parameters.size() == 4)
  43                 {
  44                         // 4 parameter version, set all topic data on the channel to the ones given in the parameters
  45                         time_t topicts = ConvToInt(parameters[1]);
  46                         if (!topicts)
  47                         {
  48                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Received SVSTOPIC with a 0 topicts, dropped.");
  49                                 return CMD_INVALID;
  50                         }
  51
  52                         std::string newtopic;
  53                         newtopic.assign(parameters[3], 0, ServerInstance->Config->Limits.MaxTopic);
  54                         bool topics_differ = (chan->topic != newtopic);
  55                         if ((topics_differ) || (chan->topicset != topicts) || (chan->setby != parameters[2]))
  56                         {
  57                                 // Update when any parameter differs
  58                                 chan->topicset = topicts;
  59                                 chan->setby.assign(parameters[2], 0, 127);
  60                                 chan->topic = newtopic;
  61                                 // Send TOPIC to clients only if the actual topic has changed, be silent otherwise
  62                                 if (topics_differ)
  63                                         chan->WriteChannel(user, "TOPIC %s :%s", chan->name.c_str(), chan->topic.c_str());
  64                         }
  65                 }
  66                 else
  67                 {
  68                         // 1 parameter version, nuke the topic
  69                         bool topic_empty = chan->topic.empty();
  70                         if (!topic_empty || !chan->setby.empty())
  71                         {
  72                                 chan->topicset = 0;
  73                                 chan->setby.clear();
  74                                 chan->topic.clear();
  75                                 if (!topic_empty)
  76                                         chan->WriteChannel(user, "TOPIC %s :", chan->name.c_str());
  77                         }
  78                 }
  79
  80                 return CMD_SUCCESS;
  81         }
  82
  83         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
  84         {
  85                 return ROUTE_BROADCAST;
  86         }
  87 };
  88
  89 class FlagExtItem : public ExtensionItem
  90 {
  91  public:
  92         FlagExtItem(const std::string& key, Module* owner)
  93                 : ExtensionItem(key, owner)
  94         {
  95         }
  96
  97         ~FlagExtItem()
  98         {
  99         }
 100
 101         bool get(const Extensible* container) const
 102         {
 103                 return (get_raw(container) != NULL);
 104         }
 105
 106         std::string serialize(SerializeFormat format, const Extensible* container, void* item) const
 107         {
 108                 if (format == FORMAT_USER)
 109                         return "true";
 110
 111                 return "1";
 112         }
 113
 114         void unserialize(SerializeFormat format, Extensible* container, const std::string& value)
 115         {
 116                 if (value == "1")
 117                         set_raw(container, this);
 118                 else
 119                         unset_raw(container);
 120         }
 121
 122         void set(Extensible* container, bool value)
 123         {
 124                 if (value)
 125                         set_raw(container, this);
 126                 else
 127                         unset_raw(container);
 128         }
 129
 130         void unset(Extensible* container)
 131         {
 132                 unset_raw(container);
 133         }
 134
 135         void free(void* item)
 136         {
 137                 // nothing to free
 138         }
 139 };
 140
 141 class ModuleTopicLock : public Module
 142 {
 143         CommandSVSTOPIC cmd;
 144         FlagExtItem topiclock;
 145
 146  public:
 147         ModuleTopicLock()
 148                 : cmd(this), topiclock("topiclock", this)
 149         {
 150         }
 151
 152         void init() CXX11_OVERRIDE
 153         {
 154                 ServerInstance->Modules->AddService(cmd);
 155                 ServerInstance->Modules->AddService(topiclock);
 156         }
 157
 158         ModResult OnPreTopicChange(User* user, Channel* chan, const std::string &topic) CXX11_OVERRIDE
 159         {
 160                 // Only fired for local users currently, but added a check anyway
 161                 if ((IS_LOCAL(user)) && (topiclock.get(chan)))
 162                 {
 163                         user->WriteNumeric(744, "%s :TOPIC cannot be changed due to topic lock being active on the channel", chan->name.c_str());
 164                         return MOD_RES_DENY;
 165                 }
 166
 167                 return MOD_RES_PASSTHRU;
 168         }
 169
 170         Version GetVersion() CXX11_OVERRIDE
 171         {
 172                 return Version("Implements server-side topic locks and the server-to-server command SVSTOPIC", VF_COMMON | VF_VENDOR);
 173         }
 174 };
 175
 176 MODULE_INIT(ModuleTopicLock)