From 9301980f9d57a2b071ba733e2c5c00e9fbea97fe Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 27 Apr 2023 14:15:45 -0700
Subject: [PATCH] ircd::m::user::keys: Implement m.signing_key_update broadcast
 interface.

---
 include/ircd/m/user/keys.h |  8 ++++
 matrix/user_keys.cc        | 79 ++++++++++++++++++++++++++++++++++++++
 modules/console.cc         | 37 ++++++++++++++++++
 3 files changed, 124 insertions(+)

diff --git a/include/ircd/m/user/keys.h b/include/ircd/m/user/keys.h
index 77796c008..a714a6da0 100644
--- a/include/ircd/m/user/keys.h
+++ b/include/ircd/m/user/keys.h
@@ -13,6 +13,8 @@
 
 struct ircd::m::user::keys
 {
+	struct send;
+
 	static string_view make_sigs_state_key(const mutable_buffer &, const string_view &tgt, const string_view &src);
 	static std::tuple<string_view, string_view> unmake_sigs_state_key(const string_view &) noexcept;
 
@@ -39,6 +41,12 @@ struct ircd::m::user::keys
 	{}
 };
 
+struct ircd::m::user::keys::send
+{
+	send(const m::user::keys &,
+	     const string_view = {});
+};
+
 inline void
 ircd::m::user::keys::cross_user(json::stack::object &out)
 const
diff --git a/matrix/user_keys.cc b/matrix/user_keys.cc
index 481b3fa25..7bb6e846d 100644
--- a/matrix/user_keys.cc
+++ b/matrix/user_keys.cc
@@ -8,6 +8,85 @@
 // copyright notice and this permission notice is present in all copies. The
 // full license for this software is available in the LICENSE file.
 
+ircd::m::user::keys::send::send(const m::user::keys &user_keys,
+                                const string_view room_id)
+try
+{
+	const auto &user_id
+	{
+		user_keys.user_room.user.user_id
+	};
+
+	const unique_mutable_buffer keys_buf[2]
+	{
+		{ 4_KiB },
+		{ 4_KiB },
+	};
+
+	json::stack keys[2]
+	{
+		{ keys_buf[0] },
+		{ keys_buf[1] },
+	};
+
+	// master
+	{
+		json::stack::object object{keys[0]};
+		user_keys.cross_master(object);
+	}
+
+	// self
+	{
+		json::stack::object object{keys[1]};
+		user_keys.cross_self(object);
+	}
+
+	json::iov event, content;
+	const json::iov::push push[]
+	{
+		{ event,    { "type",             "m.signing_key_update"  } },
+		{ event,    { "sender",            user_id                } },
+		{ content,  { "master_key",        keys[0].completed()    } },
+		{ content,  { "self_signing_key",  keys[1].completed()    } },
+		{ content,  { "user_id",           user_id                } },
+	};
+
+	// For diagnostic purposes; usually not defined.
+	const json::iov::push push_room_id
+	{
+		event, m::valid(m::id::ROOM, room_id),
+		{
+			"room_id", [&room_id]
+			{
+				return room_id;
+			}
+		}
+	};
+
+	m::vm::copts opts;
+	opts.edu = true;
+	opts.prop_mask.reset();
+	opts.prop_mask.set("origin");
+	opts.notify_clients = false;
+	m::vm::eval
+	{
+		event, content, opts
+	};
+}
+catch(const ctx::interrupted &)
+{
+	throw;
+}
+catch(const std::exception &e)
+{
+	log::error
+	{
+		m::log, "Sending m.signing_key_update for %s :%s",
+		string_view{user_keys.user_room.user.user_id},
+		e.what(),
+	};
+}
+
 void
 ircd::m::user::keys::device(json::stack::object &out,
                             const string_view &device_id)
diff --git a/modules/console.cc b/modules/console.cc
index 4767d62f1..d63511cbb 100644
--- a/modules/console.cc
+++ b/modules/console.cc
@@ -14515,6 +14515,43 @@ console_id__device(opt &out,
 	return true;
 }
 
+bool
+console_cmd__user__keys__update(opt &out, const string_view &line)
+{
+	const params param{line, " ",
+	{
+		"user_id", "room_id"
+	}};
+
+	const m::user::id &user_id
+	{
+		param.at("user_id")
+	};
+
+	const m::room::id::buf room_id
+	{
+		m::valid(m::id::ROOM, param["room_id"])?
+			m::room_id(param["room_id"]):
+			m::room::id::buf{}
+	};
+
+	const m::user::keys keys
+	{
+		user_id
+	};
+
+	m::user::keys::send
+	{
+		keys, room_id
+	};
+
+	out
+	<< "broadcast: "
+	<< user_id
+	<< std::endl;
+	return true;
+}
+
 bool
 console_cmd__user__ignores(opt &out, const string_view &line)
 {