New module to support server-side topic locking and server-to-server SVSTOPIC command

SVSTOPIC can either set the topic, the topic setter and the topic timestamp to the given parameters or can nuke the topic entirely on a channel (like it was never set)
It is for ulines only

1 files changed, 179 insertions, 0 deletions

diff --git a/src/modules/m_topiclock.cpp b/src/modules/m_topiclock.cpp
new file mode 100644
index 000000000..e17fac1a2
--- /dev/null
+++ b/src/modules/m_topiclock.cpp
@@ -0,0 +1,179 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2012 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/>.
+ */
+
+/* ModDesc: Implements server-side topic locks and the server-to-server command SVSTOPIC */
+
+#include "inspircd.h"
+
+class CommandSVSTOPIC : public Command
+{
+ public:
+	CommandSVSTOPIC(Module* Creator)
+		: Command(Creator, "SVSTOPIC", 1, 4)
+	{
+		flags_needed = FLAG_SERVERONLY;
+	}
+
+	CmdResult Handle(const std::vector<std::string> &parameters, User *user)
+	{
+		if (!ServerInstance->ULine(user->server))
+		{
+			// Ulines only
+			return CMD_FAILURE;
+		}
+
+		Channel* chan = ServerInstance->FindChan(parameters[0]);
+		if (!chan)
+			return CMD_FAILURE;
+
+		if (parameters.size() == 4)
+		{
+			// 4 parameter version, set all topic data on the channel to the ones given in the parameters
+			time_t topicts = ConvToInt(parameters[1]);
+			if (!topicts)
+			{
+				ServerInstance->Logs->Log("m_topiclock", DEFAULT, "Received SVSTOPIC with a 0 topicts, dropped.");
+				return CMD_INVALID;
+			}
+
+			std::string newtopic;
+			newtopic.assign(parameters[3], 0, ServerInstance->Config->Limits.MaxTopic);
+			bool topics_differ = (chan->topic != newtopic);
+			if ((topics_differ) || (chan->topicset != topicts) || (chan->setby != parameters[2]))
+			{
+				// Update when any parameter differs
+				chan->topicset = topicts;
+				chan->setby.assign(parameters[2], 0, 127);
+				chan->topic = newtopic;
+				// Send TOPIC to clients only if the actual topic has changed, be silent otherwise
+				if (topics_differ)
+					chan->WriteChannel(user, "TOPIC %s :%s", chan->name.c_str(), chan->topic.c_str());
+			}
+		}
+		else
+		{
+			// 1 parameter version, nuke the topic
+			bool topic_empty = chan->topic.empty();
+			if (!topic_empty || !chan->setby.empty())
+			{
+				chan->topicset = 0;
+				chan->setby.clear();
+				chan->topic.clear();
+				if (!topic_empty)
+					chan->WriteChannel(user, "TOPIC %s :", chan->name.c_str());
+			}
+		}
+
+		return CMD_SUCCESS;
+	}
+
+	RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
+	{
+		return ROUTE_BROADCAST;
+	}
+};
+
+class FlagExtItem : public ExtensionItem
+{
+ public:
+	FlagExtItem(const std::string& key, Module* owner)
+		: ExtensionItem(key, owner)
+	{
+	}
+
+	virtual ~FlagExtItem()
+	{
+	}
+
+	bool get(const Extensible* container) const
+	{
+		return (get_raw(container) != NULL);
+	}
+
+	std::string serialize(SerializeFormat format, const Extensible* container, void* item) const
+	{
+		if (format == FORMAT_USER)
+			return "true";
+
+		return "1";
+	}
+
+	void unserialize(SerializeFormat format, Extensible* container, const std::string& value)
+	{
+		if (value == "1")
+			set_raw(container, this);
+		else
+			unset_raw(container);
+	}
+
+	void set(Extensible* container, bool value)
+	{
+		if (value)
+			set_raw(container, this);
+		else
+			unset_raw(container);
+	}
+
+	void unset(Extensible* container)
+	{
+		unset_raw(container);
+	}
+
+	void free(void* item)
+	{
+		// nothing to free
+	}
+};
+
+class ModuleTopicLock : public Module
+{
+	CommandSVSTOPIC cmd;
+	FlagExtItem topiclock;
+
+ public:
+	ModuleTopicLock()
+		: cmd(this), topiclock("topiclock", this)
+	{
+	}
+
+	void init()
+	{
+		ServerInstance->Modules->AddService(cmd);
+		ServerInstance->Modules->AddService(topiclock);
+		ServerInstance->Modules->Attach(I_OnPreTopicChange, this);
+	}
+
+	ModResult OnPreTopicChange(User* user, Channel* chan, const std::string &topic)
+	{
+		// Only fired for local users currently, but added a check anyway
+		if ((IS_LOCAL(user)) && (topiclock.get(chan)))
+		{
+			user->WriteNumeric(744, "%s :TOPIC cannot be changed due to topic lock being active on the channel", chan->name.c_str());
+			return MOD_RES_DENY;
+		}
+
+		return MOD_RES_PASSTHRU;
+	}
+
+	Version GetVersion()
+	{
+		return Version("Implements server-side topic locks and the server-to-server command SVSTOPIC", VF_COMMON | VF_VENDOR);
+	}
+};
+
+MODULE_INIT(ModuleTopicLock)