mirror of
https://github.com/matrix-construct/construct
synced 2024-09-03 23:35:19 +02:00
150 lines
3.8 KiB
C++
150 lines
3.8 KiB
C++
// 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 bool visible_to_node(const room &, const string_view &node_id, const event &);
|
|
static bool visible_to_user(const room &, const string_view &history_visibility, const m::user::id &, const event &);
|
|
}
|
|
|
|
bool
|
|
IRCD_MODULE_EXPORT
|
|
ircd::m::visible(const m::event &event,
|
|
const string_view &mxid)
|
|
{
|
|
const m::room room
|
|
{
|
|
at<"room_id"_>(event), event.event_id
|
|
};
|
|
|
|
const m::room::state state
|
|
{
|
|
room
|
|
};
|
|
|
|
const event::idx visibility_event_idx
|
|
{
|
|
state.get(std::nothrow, "m.room.history_visibility", "")
|
|
};
|
|
|
|
char buf[32];
|
|
string_view history_visibility{"shared"};
|
|
m::get(std::nothrow, visibility_event_idx, "content", [&buf, &history_visibility]
|
|
(const json::object &content)
|
|
{
|
|
const json::string &_history_visibility
|
|
{
|
|
content.get("history_visibility", "shared")
|
|
};
|
|
|
|
history_visibility = strncpy
|
|
{
|
|
buf, _history_visibility
|
|
};
|
|
});
|
|
|
|
if(history_visibility == "world_readable")
|
|
return true;
|
|
|
|
if(empty(mxid))
|
|
return false;
|
|
|
|
if(m::valid(m::id::USER, mxid))
|
|
return visible_to_user(room, history_visibility, mxid, event);
|
|
|
|
if(rfc3986::valid_remote(std::nothrow, mxid))
|
|
return visible_to_node(room, mxid, event);
|
|
|
|
throw m::UNSUPPORTED
|
|
{
|
|
"Cannot determine visibility of %s for '%s'",
|
|
string_view{room.room_id},
|
|
mxid,
|
|
};
|
|
}
|
|
|
|
bool
|
|
ircd::m::visible_to_user(const m::room &room,
|
|
const string_view &history_visibility,
|
|
const m::user::id &user_id,
|
|
const m::event &event)
|
|
{
|
|
assert(history_visibility != "world_readable");
|
|
|
|
// Allow any member event where the state_key string is a user mxid.
|
|
if(json::get<"type"_>(event) == "m.room.member")
|
|
if(at<"state_key"_>(event) == user_id)
|
|
return true;
|
|
|
|
// Get the membership of the user in the room at the event.
|
|
char buf[m::room::MEMBERSHIP_MAX_SIZE];
|
|
const string_view membership
|
|
{
|
|
m::membership(buf, room, user_id)
|
|
};
|
|
|
|
if(membership == "join")
|
|
return true;
|
|
|
|
if(history_visibility == "joined")
|
|
return false;
|
|
|
|
if(membership == "invite")
|
|
return true;
|
|
|
|
if(history_visibility == "invited")
|
|
return false;
|
|
|
|
// The history_visibility is now likely "shared"; though we cannot assert
|
|
// that in case some other string is used for any non-spec customization
|
|
// or for graceful forward compatibility. We default to "shared" here.
|
|
//assert(history_visibility == "shared");
|
|
|
|
// An m::room instance with no event_id is used to query the room at the
|
|
// present state.
|
|
const m::room present
|
|
{
|
|
room.room_id
|
|
};
|
|
|
|
// If the room is not at the present event then we have to run another
|
|
// test for membership here. Otherwise the "join" test already failed.
|
|
if(!room.event_id)
|
|
return false;
|
|
|
|
return m::membership(present, user_id, m::membership_positive); // join || invite
|
|
}
|
|
|
|
bool
|
|
ircd::m::visible_to_node(const m::room &room,
|
|
const string_view &node_id,
|
|
const m::event &event)
|
|
{
|
|
// Allow auth chain events XXX: this is too broad
|
|
if(m::room::auth::is_power_event(event))
|
|
return true;
|
|
|
|
// Allow any event where the state_key string is a user mxid and the server
|
|
// is the host of that user. Note that applies to any type of event.
|
|
if(m::valid(m::id::USER, json::get<"state_key"_>(event)))
|
|
if(m::user::id(at<"state_key"_>(event)).host() == node_id)
|
|
return true;
|
|
|
|
const m::room::origins origins
|
|
{
|
|
room
|
|
};
|
|
|
|
// Allow joined servers
|
|
if(origins.has(node_id))
|
|
return true;
|
|
|
|
return false;
|
|
}
|