0
0
Fork 0
mirror of https://github.com/matrix-construct/construct synced 2024-11-05 13:28:54 +01:00
construct/modules/client/rooms/context.cc

297 lines
5.2 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.
#include "rooms.h"
using namespace ircd;
const size_t
default_limit
{
// 11.20.1.1 - The maximum number of events to return. Default: 10.
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 },
};
const m::event::fetch::opts
default_fetch_opts
{
m::event::keys::include
{
"content",
"depth",
"event_id",
"origin_server_ts",
"redacts",
"room_id",
"sender",
"state_key",
"type",
},
};
log::log
context_log
{
"matrix.context"
};
static void
_append(json::stack::array &,
const m::event &,
const m::event::idx &,
const m::user::room &,
const int64_t &,
const bool &query_txnid = true);
resource::response
get__context(client &client,
const 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{[&request]
{
auto ret(request.query.get<size_t>("limit", default_limit));
return std::min(ret, size_t(limit_max));
}()};
const m::room room
{
room_id, event_id
};
if(!room.visible(request.user_id))
throw m::ACCESS_DENIED
{
"You are not permitted to view the room at this event"
};
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)
};
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::append() to modify/add/remove data for this client.
m::event_append_opts opts;
opts.event_idx = &event.event_idx;
opts.user_id = &user_room.user.user_id;
opts.user_room = &user_room;
opts.room_depth = &room_depth;
m::append(_event, event, opts);
}
// 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::messages before
{
room, event_id, &default_fetch_opts
};
if(before)
--before;
for(size_t i(0); i < limit && before; --before, ++i)
{
const m::event &event{*before};
start = at<"event_id"_>(event);
if(!visible(event, request.user_id))
continue;
_append(array, event, before.event_idx(), user_room, room_depth);
++counts.before;
}
if(before && limit > 0)
--before;
if(before)
start = before.event_id();
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::messages after
{
room, event_id, &default_fetch_opts
};
if(after)
++after;
for(size_t i(0); i < limit && after; ++after, ++i)
{
const m::event &event{*after};
end = at<"event_id"_>(event);
if(!visible(event, request.user_id))
continue;
_append(array, event, after.event_idx(), user_room, room_depth);
++counts.after;
}
if(after && limit > 0)
++after;
if(after)
end = after.event_id();
else
end = {};
}
if(end)
json::stack::member
{
ret, "end", json::value{end}
};
{
json::stack::array array
{
ret, "state"
};
const m::room::state state
{
room, &default_fetch_opts
};
state.for_each([&array, &request, &user_room, &room_depth, &counts]
(const m::event::idx &event_idx)
{
const m::event::fetch event
{
event_idx, std::nothrow
};
if(!event.valid)
return;
if(!visible(event, request.user_id))
return;
_append(array, event, event_idx, user_room, room_depth, false);
++counts.state;
});
}
log::debug
{
context_log, "%s %s in %s before:%zu start:%s after:%zu end:%s state:%zu",
client.loghead(),
string_view{event_id},
string_view{room_id},
counts.before,
string_view{start},
counts.after,
string_view{end},
counts.state,
};
return response;
}
void
_append(json::stack::array &chunk,
const m::event &event,
const m::event::idx &event_idx,
const m::user::room &user_room,
const int64_t &room_depth,
const bool &query_txnid)
{
m::event_append_opts opts;
opts.event_idx = &event_idx;
opts.user_id = &user_room.user.user_id;
opts.user_room = &user_room;
opts.room_depth = &room_depth;
m::append(chunk, event, opts);
}