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construct/modules/client/rooms/context.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.
#include "rooms.h"
using namespace ircd;
/// 11.20.1.1 - The maximum number of events to return. Default: 10.
const size_t
default_limit
{
10
};
conf::item<size_t>
limit_max
{
{ "name", "ircd.client.rooms.context.limit.max" },
{ "default", 128L },
};
conf::item<size_t>
flush_hiwat
{
{ "name", "ircd.client.rooms.context.flush.hiwat" },
{ "default", 16384L },
};
log::log
context_log
{
"m.context"
};
m::resource::response
get__context(client &client,
const m::resource::request &request,
const m::room::id &room_id)
{
if(request.parv.size() < 3)
throw m::NEED_MORE_PARAMS
{
"event_id path parameter required"
};
m::event::id::buf event_id
{
url::decode(event_id, request.parv[2])
};
const auto limit
{
std::min(request.query.get<size_t>("limit", default_limit), size_t(limit_max))
};
const m::room room
{
room_id, event_id
};
if(!visible(room, request.user_id))
throw m::ACCESS_DENIED
{
"You are not permitted to view the room at this event"
};
// Non-spec param to allow preventing any state from being returned.
const bool include_state
{
request.query.get("state", true)
};
// The standard ?filter= is parsed here. m::filter::get() handles
// whether this is a filter_id and conducts a fetch into this buffer;
// or inline JSON, and performs URL decoding into this buffer.
const std::string filter_json
{
m::filter::get(request.query["filter"], request.user_id)
};
const m::room_event_filter filter
{
filter_json
};
const m::event::fetch event
{
event_id
};
const m::user::room &user_room
{
request.user_id
};
const auto room_depth
{
m::depth(std::nothrow, room_id)
};
m::resource::response::chunked response
{
client, http::OK
};
json::stack out
{
response.buf, response.flusher(), size_t(flush_hiwat)
};
json::stack::object ret
{
out
};
// Output the main event first.
{
json::stack::object _event
{
ret, "event"
};
// We use m::event::append() to modify/add/remove data for this client.
m::event::append
{
_event, event,
{
.event_idx = &event.event_idx,
.user_id = &user_room.user.user_id,
.user_room = &user_room,
.room_depth = &room_depth,
}
};
}
// Counters for debug messages
struct counts
{
size_t before {0};
size_t after {0};
size_t state {0};
}
counts;
m::event::id::buf start;
{
json::stack::array array
{
ret, "events_before"
};
m::room::events before
{
room, event_id
};
if(before)
--before;
for(size_t i(0); i < limit && before; --before, ++i)
{
const m::event &event{*before};
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start = event.event_id;
if(!visible(event, request.user_id))
continue;
const auto event_idx(before.event_idx());
counts.before += m::event::append
{
array, event,
{
.event_idx = &event_idx,
.user_id = &user_room.user.user_id,
.user_room = &user_room,
.room_depth = &room_depth,
.query_txnid = true,
}
};
}
if(before && limit > 0)
--before;
if(before)
start = m::event_id(before.event_idx());
else
start = {};
}
if(start)
json::stack::member
{
ret, "start", json::value{start}
};
m::event::id::buf end;
{
json::stack::array array
{
ret, "events_after"
};
m::room::events after
{
room, event_id
};
if(after)
++after;
for(size_t i(0); i < limit && after; ++after, ++i)
{
const m::event &event{*after};
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end = event.event_id;
if(!visible(event, request.user_id))
continue;
const auto event_idx(after.event_idx());
counts.after += m::event::append
{
array, event,
{
.event_idx = &event_idx,
.user_id = &user_room.user.user_id,
.user_room = &user_room,
.room_depth = &room_depth,
.query_txnid = true,
}
};
}
if(after && limit > 0)
++after;
if(after)
end = m::event_id(after.event_idx());
else
end = {};
}
if(end)
json::stack::member
{
ret, "end", json::value{end}
};
if(include_state)
{
json::stack::array array
{
ret, "state"
};
const m::room::state state
{
room
};
// Setup the event::fetch instance outside of the closure to avoid
// underlying reconstruction costs for now.
m::event::fetch event;
// Iterate the state.
state.for_each([&]
(const string_view &type, const string_view &state_key, const m::event::idx &event_idx)
{
// Conditions to decide if we should skip this state event based
// on the lazy-loading spec.
const bool lazy_loaded
{
// The user supplied a filter enabling lazy-loading.
json::get<"lazy_load_members"_>(filter) &&
// The type of this state event is a m.room.member type
type == "m.room.member"
};
if(lazy_loaded)
return true;
if(!seek(std::nothrow, event, event_idx))
return true;
if(!visible(event, request.user_id))
return true;
counts.state += m::event::append
{
array, event,
{
.event_idx = &event_idx,
.user_id = &user_room.user.user_id,
.user_room = &user_room,
.room_depth = &room_depth,
.query_txnid = false,
}
};
return true;
});
}
log::debug
{
context_log, "%s %s in %s before:%zu start:%s after:%zu end:%s state:%zu",
loghead(client),
string_view{event_id},
string_view{room_id},
counts.before,
string_view{start},
counts.after,
string_view{end},
counts.state,
};
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return response;
}