From 7469c0913070d6c46ec094baa80adb657b8d0e3c Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Sun, 14 Aug 2022 17:29:23 -0700
Subject: [PATCH] modules/m_room_message: Stub media-specific effects hook.

---
 modules/m_room_message.cc | 68 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/modules/m_room_message.cc b/modules/m_room_message.cc
index c63077bb0..468863355 100644
--- a/modules/m_room_message.cc
+++ b/modules/m_room_message.cc
@@ -10,7 +10,10 @@
 
 namespace ircd::m
 {
+	static void room_message_media(const event &, vm::eval &);
 	static void room_message_info(const event &, vm::eval &);
+
+	extern hookfn<vm::eval &> room_message_media_hook;
 	extern hookfn<vm::eval &> room_message_info_hook;
 	extern log::log room_message_log;
 }
@@ -37,6 +40,16 @@ ircd::m::room_message_info_hook
 	}
 };
 
+decltype(ircd::m::room_message_media_hook)
+ircd::m::room_message_media_hook
+{
+	room_message_media,
+	{
+		{ "_site",  "vm.effects"      },
+		{ "type",   "m.room.message"  },
+	}
+};
+
 void
 ircd::m::room_message_info(const event &event,
                            vm::eval &eval)
@@ -67,3 +80,58 @@ ircd::m::room_message_info(const event &event,
 		size(body) > 128? "..."_sv : string_view{}
 	};
 }
+
+void
+ircd::m::room_message_media(const event &event,
+                            vm::eval &eval)
+{
+	const m::room::message msg
+	{
+		json::get<"content"_>(event)
+	};
+
+	const auto &msgtype
+	{
+		json::get<"msgtype"_>(msg)
+	};
+
+	const bool match
+	{
+		false
+		|| msgtype == "m.image"
+		|| msgtype == "m.video"
+		|| msgtype == "m.audio"
+		|| msgtype == "m.file"
+	};
+
+	if(!match)
+		return;
+
+	const auto &url
+	{
+		json::get<"url"_>(msg)
+	};
+
+	if(!url)
+		return;
+
+	const media::mxc mxc
+	{
+		url
+	};
+
+	const auto file_room_id
+	{
+		media::file::room_id(mxc)
+	};
+
+	log::debug
+	{
+		room_message_log, "%s posted %s at %s in %s with %s",
+		json::get<"sender"_>(event),
+		msgtype,
+		json::get<"url"_>(msg),
+		json::get<"room_id"_>(event),
+		string_view{event.event_id},
+	};
+}