From 889d521e05f2e922683d48c74eb00290e7a2f548 Mon Sep 17 00:00:00 2001
From: Sadie Powell
Date: Wed, 17 Jul 2024 00:06:50 +0100
Subject: Shuffle the modules about a bit.

---
 modules/spanningtree/ftopic.cpp | 93 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 modules/spanningtree/ftopic.cpp

(limited to 'modules/spanningtree/ftopic.cpp')

diff --git a/modules/spanningtree/ftopic.cpp b/modules/spanningtree/ftopic.cpp
new file mode 100644
index 000000000..11eaf434d
--- /dev/null
+++ b/modules/spanningtree/ftopic.cpp
@@ -0,0 +1,93 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2018, 2020, 2023 Sadie Powell <sadie@witchery.services>
+ *   Copyright (C) 2012-2014, 2016 Attila Molnar <attilamolnar@hush.com>
+ *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
+ *   Copyright (C) 2010 Daniel De Graaf <danieldg@inspircd.org>
+ *   Copyright (C) 2009 Uli Schlachter <psychon@znc.in>
+ *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
+ *
+ * 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/>.
+ */
+
+
+#include "inspircd.h"
+#include "commands.h"
+
+/** FTOPIC command */
+CmdResult CommandFTopic::Handle(User* user, Params& params)
+{
+	auto* c = ServerInstance->Channels.Find(params[0]);
+	if (!c)
+		return CmdResult::FAILURE;
+
+	if (c->age < ServerCommand::ExtractTS(params[1]))
+		// Our channel TS is older, nothing to do
+		return CmdResult::FAILURE;
+
+	// Channel::topicset is initialized to 0 on channel creation, so their ts will always win if we never had a topic
+	time_t ts = ServerCommand::ExtractTS(params[2]);
+	if (ts < c->topicset)
+		return CmdResult::FAILURE;
+
+	// The topic text is always the last parameter
+	const std::string& newtopic = params.back();
+
+	// If there is a setter in the message use that, otherwise use the message source
+	const std::string& setter = ((params.size() > 4) ? params[3] : (ServerInstance->Config->MaskInTopic ? user->GetMask() : user->nick));
+
+	/*
+	 * If the topics were updated at the exact same second, accept
+	 * the remote only when it's "bigger" than ours as defined by
+	 * string comparison, so non-empty topics always override
+	 * empty topics if their timestamps are equal
+	 *
+	 * Similarly, if the topic texts are equal too, keep one topic
+	 * setter and discard the other
+	 */
+	if (ts == c->topicset)
+	{
+		// Discard if their topic text is "smaller"
+		if (c->topic > newtopic)
+			return CmdResult::FAILURE;
+
+		// If the texts are equal in addition to the timestamps, decide which setter to keep
+		if ((c->topic == newtopic) && (c->setby >= setter))
+			return CmdResult::FAILURE;
+	}
+
+	c->SetTopic(user, newtopic, ts, &setter);
+	return CmdResult::SUCCESS;
+}
+
+// Used when bursting and in reply to RESYNC, contains topic setter as the 4th parameter
+CommandFTopic::Builder::Builder(Channel* chan)
+	: CmdBuilder("FTOPIC")
+{
+	push(chan->name);
+	push_int(chan->age);
+	push_int(chan->topicset);
+	push(chan->setby);
+	push_last(chan->topic);
+}
+
+// Used when changing the topic, the setter is the message source
+CommandFTopic::Builder::Builder(User* user, Channel* chan)
+	: CmdBuilder(user, "FTOPIC")
+{
+	push(chan->name);
+	push_int(chan->age);
+	push_int(chan->topicset);
+	push_last(chan->topic);
+}
-- 
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