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construct/modules/m_room_canonical_alias.cc

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// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
namespace ircd::m
{
static void changed_canonical_alias(const event &, vm::eval &);
extern const room alias_room;
extern const room::id::buf alias_room_id;
extern hookfn<vm::eval &> changed_canonical_alias_hookfn;
}
ircd::mapi::header
IRCD_MODULE
{
"Matrix m.room.canonical_alias"
};
decltype(ircd::m::alias_room_id)
ircd::m::alias_room_id
{
"alias", ircd::my_host()
};
decltype(ircd::m::alias_room)
ircd::m::alias_room
{
alias_room_id
};
decltype(ircd::m::changed_canonical_alias_hookfn)
ircd::m::changed_canonical_alias_hookfn
{
changed_canonical_alias,
{
{ "_site", "vm.effect" },
{ "type", "m.room.canonical_alias" },
}
};
void
ircd::m::changed_canonical_alias(const event &event,
vm::eval &)
{
const room::id &room_id
{
at<"room_id"_>(event)
};
const m::room room
{
room_id, event.event_id
};
const json::object &content
{
at<"content"_>(event)
};
const json::string &content_alias
{
content.get("alias")
};
const room::alias &alias
{
!empty(content_alias)?
m::room::alias{content_alias}:
m::room::alias{}
};
if(alias)
{
if(m::room::aliases::cache::has(alias))
return;
m::room::aliases::cache::set(alias, room_id);
log::info
{
m::log, "Canonical alias %s for %s added by %s",
string_view{alias},
string_view{room_id},
json::get<"sender"_>(event),
};
return;
}
const auto present_event_idx
{
room.get(std::nothrow, "m.room.canonical_alias", "")
};
if(!present_event_idx)
return;
const auto prev_state_idx
{
m::room::state::prev(present_event_idx)
};
m::get(std::nothrow, prev_state_idx, "content", [&room_id, &event]
(const json::object &content)
{
const json::string &alias
{
content["alias"]
};
m::room::aliases::cache::del(alias);
log::info
{
m::log, "Canonical alias of %s removed by %s was %s",
string_view{room_id},
json::get<"sender"_>(event),
string_view{alias},
};
});
}