mirror of
https://github.com/matrix-construct/construct
synced 2024-08-20 16:44:43 +02:00
319 lines
7.6 KiB
C++
319 lines
7.6 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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using namespace ircd;
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static void handle_ircd_presence(const m::event &, m::vm::eval &);
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static void handle_edu_m_presence_object(const m::event &, const m::presence &edu);
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static void handle_edu_m_presence(const m::event &, m::vm::eval &);
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mapi::header
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IRCD_MODULE
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{
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"Matrix Presence"
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};
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/// Coarse enabler for incoming federation presence events. If this is
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/// disabled then all presence coming over the federation is ignored. Note
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/// that there are other ways to degrade or ignore presence in various
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/// other subsystems like sync without losing the data; however presence
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/// data over the federation is considerable and tiny deployments which
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/// won't /sync presence to clients should probably quench it here too.
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conf::item<bool>
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federation_incoming
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{
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{ "name", "ircd.m.presence.federation.incoming" },
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{ "default", true },
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};
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/// Coarse enabler to send presence events over the federation.
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conf::item<bool>
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federation_send
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{
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{ "name", "ircd.m.presence.federation.send" },
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{ "default", false },
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};
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log::log
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presence_log
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{
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"m.presence"
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};
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/// This hook processes incoming m.presence events from the federation and
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/// turns them into ircd.presence events in the user's room.
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const m::hookfn<m::vm::eval &>
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_m_presence_eval
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{
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handle_edu_m_presence,
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{
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{ "_site", "vm.eval" },
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{ "type", "m.presence" },
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}
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};
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extern const string_view
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valid_states[];
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void
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handle_edu_m_presence(const m::event &event,
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m::vm::eval &eval)
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try
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{
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if(!federation_incoming)
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return;
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if(my(event))
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return;
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const json::object &content
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{
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at<"content"_>(event)
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};
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const json::array &push
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{
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content.get("push")
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};
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for(const json::object &presence : push)
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handle_edu_m_presence_object(event, presence);
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}
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catch(const std::exception &e)
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{
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log::derror
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{
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presence_log, "Presence from %s :%s",
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json::get<"origin"_>(event),
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e.what(),
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};
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}
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void
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handle_edu_m_presence_object(const m::event &event,
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const m::presence &object)
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try
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{
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const m::user::id &user_id
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{
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at<"user_id"_>(object)
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};
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if(user_id.host() != at<"origin"_>(event))
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{
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log::dwarning
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{
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presence_log, "Ignoring %s from %s for user %s",
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at<"type"_>(event),
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at<"origin"_>(event),
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string_view{user_id}
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};
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return;
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}
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bool useful{true};
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const auto closure{[&event, &object, &useful]
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(const m::event &existing_event)
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{
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const json::object &existing_object
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{
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json::get<"content"_>(existing_event)
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};
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// This check shouldn't have to exist. I think this was a result of corrupting
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// my DB during development and it fails on only one user. Nevertheless, it's
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// a valid assertion so might as well keep it.
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if(unlikely(json::get<"user_id"_>(object) != unquote(existing_object.get("user_id"))))
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{
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//log::critical("%s != %s", json::get<"user_id"_>(object), unquote(existing_object.get("user_id")));
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return;
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}
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assert(json::get<"user_id"_>(object) == unquote(existing_object.get("user_id")));
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const auto &prev_active_ago
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{
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existing_object.get<time_t>("last_active_ago")
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};
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const time_t &now_active_ago
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{
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json::get<"last_active_ago"_>(object)
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};
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const time_t &prev_active_absolute
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{
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json::get<"origin_server_ts"_>(existing_event) - prev_active_ago
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};
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const time_t &now_active_absolute
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{
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json::get<"origin_server_ts"_>(event) - now_active_ago
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};
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// First way to filter out the synapse presence spam bug is seeing
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// if the update is older than the last update.
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if(now_active_absolute < prev_active_absolute)
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useful = false;
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else if(json::get<"presence"_>(object) != unquote(existing_object.get("presence")))
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useful = true;
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else if(json::get<"currently_active"_>(object) != existing_object.get<bool>("currently_active"))
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useful = true;
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else if(json::get<"currently_active"_>(object))
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useful = true;
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else
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useful = false;
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}};
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static const m::event::fetch::opts fopts
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{
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m::event::keys::include {"content", "origin_server_ts"}
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};
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m::presence::get(std::nothrow, user_id, closure, &fopts);
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if(!useful)
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{
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log::dwarning
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{
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presence_log, "presence spam from %s %s is %s and %s %zd seconds ago",
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at<"origin"_>(event),
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string_view{user_id},
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json::get<"currently_active"_>(object)? "active"_sv : "inactive"_sv,
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json::get<"presence"_>(object),
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json::get<"last_active_ago"_>(object) / 1000L
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};
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return;
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}
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const auto evid
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{
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m::presence::set(object)
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};
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log::info
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{
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presence_log, "%s %s is %s and %s %zd seconds ago",
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at<"origin"_>(event),
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string_view{user_id},
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json::get<"currently_active"_>(object)? "active"_sv : "inactive"_sv,
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json::get<"presence"_>(object),
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json::get<"last_active_ago"_>(object) / 1000L
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};
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}
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catch(const m::error &e)
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{
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log::error
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{
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presence_log, "Presence from %s :%s :%s",
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json::get<"origin"_>(event),
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e.what(),
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e.content
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};
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}
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/// This hook processes ircd.presence events generated internally from local
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/// users and converts them to m.presence over the federation.
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const m::hookfn<m::vm::eval &>
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_ircd_presence_eval
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{
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handle_ircd_presence,
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{
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{ "_site", "vm.effect" },
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{ "type", "ircd.presence" },
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}
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};
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void
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handle_ircd_presence(const m::event &event,
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m::vm::eval &eval)
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try
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{
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if(!federation_send)
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return;
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const m::user::id &user_id
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{
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json::get<"sender"_>(event)
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};
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if(!my(user_id))
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return;
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// The event has to be an ircd.presence in the user's room, not just a
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// random ircd.presence typed event in some other room...
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if(!m::user::room::is(json::get<"room_id"_>(event), user_id))
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return;
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// Get the spec EDU data from our PDU's content
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const m::edu::m_presence edu
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{
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json::get<"content"_>(event)
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};
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// Check if the user_id in the content is legitimate. This should have
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// been checked on any input side, but nevertheless we'll ignore any
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// discrepancies here for now.
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if(unlikely(json::get<"user_id"_>(edu) != user_id))
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return;
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// The matrix EDU format requires us to wrap this data in an array
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// called "push" so we copy content into this stack buffer :/
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char buf[512];
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json::stack out{buf};
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{
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json::stack::array push{out};
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push.append(edu);
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}
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// Note that "sender" is intercepted by the federation sender and not
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// actually sent over the wire.
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json::iov edu_event, content;
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const json::iov::push pushed[]
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{
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{ edu_event, { "type", "m.presence" }},
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{ edu_event, { "sender", user_id }},
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{ content, { "push", out.completed() }},
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};
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// Setup for a core injection of an EDU.
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m::vm::copts opts;
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opts.edu = true;
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opts.prop_mask.reset(); // Clear all PDU properties
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opts.prop_mask.set("origin");
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opts.notify_clients = false; // Client /sync already saw the ircd.presence
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// Execute
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m::vm::eval
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{
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edu_event, content, opts
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};
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log::info
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{
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presence_log, "%s is %s and %s %zd seconds ago",
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string_view{user_id},
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json::get<"currently_active"_>(edu)? "active"_sv : "inactive"_sv,
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json::get<"presence"_>(edu),
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json::get<"last_active_ago"_>(edu) / 1000L,
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};
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}
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catch(const std::exception &e)
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{
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log::error
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{
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presence_log, "Presence from our %s to federation :%s",
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string_view{json::get<"sender"_>(event)},
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e.what(),
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};
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}
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