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 (!user->server->IsULine())
  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, ExtensionItem::EXT_CHANNEL, owner)
  94         {
  95         }
  96
  97         bool get(const Extensible* container) const
  98         {
  99                 return (get_raw(container) != NULL);
 100         }
 101
 102         std::string serialize(SerializeFormat format, const Extensible* container, void* item) const
 103         {
 104                 if (format == FORMAT_USER)
 105                         return "true";
 106
 107                 return "1";
 108         }
 109
 110         void unserialize(SerializeFormat format, Extensible* container, const std::string& value)
 111         {
 112                 if (value == "1")
 113                         set_raw(container, this);
 114                 else
 115                         unset_raw(container);
 116         }
 117
 118         void set(Extensible* container, bool value)
 119         {
 120                 if (value)
 121                         set_raw(container, this);
 122                 else
 123                         unset_raw(container);
 124         }
 125
 126         void unset(Extensible* container)
 127         {
 128                 unset_raw(container);
 129         }
 130
 131         void free(void* item)
 132         {
 133                 // nothing to free
 134         }
 135 };
 136
 137 class ModuleTopicLock : public Module
 138 {
 139         CommandSVSTOPIC cmd;
 140         FlagExtItem topiclock;
 141
 142  public:
 143         ModuleTopicLock()
 144                 : cmd(this), topiclock("topiclock", this)
 145         {
 146         }
 147
 148         ModResult OnPreTopicChange(User* user, Channel* chan, const std::string &topic) CXX11_OVERRIDE
 149         {
 150                 // Only fired for local users currently, but added a check anyway
 151                 if ((IS_LOCAL(user)) && (topiclock.get(chan)))
 152                 {
 153                         user->WriteNumeric(744, "%s :TOPIC cannot be changed due to topic lock being active on the channel", chan->name.c_str());
 154                         return MOD_RES_DENY;
 155                 }
 156
 157                 return MOD_RES_PASSTHRU;
 158         }
 159
 160         Version GetVersion() CXX11_OVERRIDE
 161         {
 162                 return Version("Implements server-side topic locks and the server-to-server command SVSTOPIC", VF_COMMON | VF_VENDOR);
 163         }
 164 };
 165
 166 MODULE_INIT(ModuleTopicLock)