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 /* ModDesc: Implements server-side topic locks and the server-to-server command SVSTOPIC */
  20
  21 #include "inspircd.h"
  22
  23 class CommandSVSTOPIC : public Command
  24 {
  25  public:
  26         CommandSVSTOPIC(Module* Creator)
  27                 : Command(Creator, "SVSTOPIC", 1, 4)
  28         {
  29                 flags_needed = FLAG_SERVERONLY;
  30         }
  31
  32         CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  33         {
  34                 if (!ServerInstance->ULine(user->server))
  35                 {
  36                         // Ulines only
  37                         return CMD_FAILURE;
  38                 }
  39
  40                 Channel* chan = ServerInstance->FindChan(parameters[0]);
  41                 if (!chan)
  42                         return CMD_FAILURE;
  43
  44                 if (parameters.size() == 4)
  45                 {
  46                         // 4 parameter version, set all topic data on the channel to the ones given in the parameters
  47                         time_t topicts = ConvToInt(parameters[1]);
  48                         if (!topicts)
  49                         {
  50                                 ServerInstance->Logs->Log("m_topiclock", DEFAULT, "Received SVSTOPIC with a 0 topicts, dropped.");
  51                                 return CMD_INVALID;
  52                         }
  53
  54                         std::string newtopic;
  55                         newtopic.assign(parameters[3], 0, ServerInstance->Config->Limits.MaxTopic);
  56                         bool topics_differ = (chan->topic != newtopic);
  57                         if ((topics_differ) || (chan->topicset != topicts) || (chan->setby != parameters[2]))
  58                         {
  59                                 // Update when any parameter differs
  60                                 chan->topicset = topicts;
  61                                 chan->setby.assign(parameters[2], 0, 127);
  62                                 chan->topic = newtopic;
  63                                 // Send TOPIC to clients only if the actual topic has changed, be silent otherwise
  64                                 if (topics_differ)
  65                                         chan->WriteChannel(user, "TOPIC %s :%s", chan->name.c_str(), chan->topic.c_str());
  66                         }
  67                 }
  68                 else
  69                 {
  70                         // 1 parameter version, nuke the topic
  71                         bool topic_empty = chan->topic.empty();
  72                         if (!topic_empty || !chan->setby.empty())
  73                         {
  74                                 chan->topicset = 0;
  75                                 chan->setby.clear();
  76                                 chan->topic.clear();
  77                                 if (!topic_empty)
  78                                         chan->WriteChannel(user, "TOPIC %s :", chan->name.c_str());
  79                         }
  80                 }
  81
  82                 return CMD_SUCCESS;
  83         }
  84
  85         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
  86         {
  87                 return ROUTE_BROADCAST;
  88         }
  89 };
  90
  91 class FlagExtItem : public ExtensionItem
  92 {
  93  public:
  94         FlagExtItem(const std::string& key, Module* owner)
  95                 : ExtensionItem(key, owner)
  96         {
  97         }
  98
  99         virtual ~FlagExtItem()
 100         {
 101         }
 102
 103         bool get(const Extensible* container) const
 104         {
 105                 return (get_raw(container) != NULL);
 106         }
 107
 108         std::string serialize(SerializeFormat format, const Extensible* container, void* item) const
 109         {
 110                 if (format == FORMAT_USER)
 111                         return "true";
 112
 113                 return "1";
 114         }
 115
 116         void unserialize(SerializeFormat format, Extensible* container, const std::string& value)
 117         {
 118                 if (value == "1")
 119                         set_raw(container, this);
 120                 else
 121                         unset_raw(container);
 122         }
 123
 124         void set(Extensible* container, bool value)
 125         {
 126                 if (value)
 127                         set_raw(container, this);
 128                 else
 129                         unset_raw(container);
 130         }
 131
 132         void unset(Extensible* container)
 133         {
 134                 unset_raw(container);
 135         }
 136
 137         void free(void* item)
 138         {
 139                 // nothing to free
 140         }
 141 };
 142
 143 class ModuleTopicLock : public Module
 144 {
 145         CommandSVSTOPIC cmd;
 146         FlagExtItem topiclock;
 147
 148  public:
 149         ModuleTopicLock()
 150                 : cmd(this), topiclock("topiclock", this)
 151         {
 152         }
 153
 154         void init()
 155         {
 156                 ServerInstance->Modules->AddService(cmd);
 157                 ServerInstance->Modules->AddService(topiclock);
 158                 ServerInstance->Modules->Attach(I_OnPreTopicChange, this);
 159         }
 160
 161         ModResult OnPreTopicChange(User* user, Channel* chan, const std::string &topic)
 162         {
 163                 // Only fired for local users currently, but added a check anyway
 164                 if ((IS_LOCAL(user)) && (topiclock.get(chan)))
 165                 {
 166                         user->WriteNumeric(744, "%s :TOPIC cannot be changed due to topic lock being active on the channel", chan->name.c_str());
 167                         return MOD_RES_DENY;
 168                 }
 169
 170                 return MOD_RES_PASSTHRU;
 171         }
 172
 173         Version GetVersion()
 174         {
 175                 return Version("Implements server-side topic locks and the server-to-server command SVSTOPIC", VF_COMMON | VF_VENDOR);
 176         }
 177 };
 178
 179 MODULE_INIT(ModuleTopicLock)