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construct/modules/federation/backfill_ids.cc

140 lines
2.4 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.
using namespace ircd;
mapi::header
IRCD_MODULE
{
"federation backfill event IDs"
};
resource
backfill_ids_resource
{
"/_matrix/federation/v1/backfill_ids/",
{
"federation backfill ID's",
resource::DIRECTORY,
}
};
conf::item<size_t>
backfill_ids_limit_max
{
{ "name", "ircd.federation.backfill_ids.limit.max" },
{ "default", 131072L },
};
conf::item<size_t>
backfill_ids_limit_default
{
{ "name", "ircd.federation.backfill_ids.limit.default" },
{ "default", 64L },
};
static size_t
calc_limit(const resource::request &request)
{
const auto &limit
{
request.query["limit"]
};
if(!limit)
return size_t(backfill_ids_limit_default);
const size_t &ret
{
lex_cast<size_t>(limit)
};
return std::min(ret, size_t(backfill_ids_limit_max));
}
resource::response
get__backfill_ids(client &client,
const resource::request &request)
{
m::room::id::buf room_id
{
url::decode(room_id, request.parv[0])
};
m::event::id::buf event_id
{
request.query["v"]?
url::decode(event_id, request.query.at("v")):
m::head(room_id)
};
const m::room room
{
room_id, event_id
};
if(!room.visible(request.node_id))
throw m::ACCESS_DENIED
{
"You are not permitted to view the room at this event"
};
const size_t limit
{
calc_limit(request)
};
m::room::messages it
{
room
};
resource::response::chunked response
{
client, http::OK
};
json::stack out
{
response.buf, response.flusher()
};
json::stack::object top{out};
json::stack::member pdus_m
{
top, "pdu_ids"
};
json::stack::array pdus
{
pdus_m
};
size_t count{0};
for(; it && count < limit; ++count, --it)
{
const auto &event_id(it.event_id());
if(!visible(event_id, request.node_id))
continue;
pdus.append(event_id);
}
return {};
}
resource::method
method_get
{
backfill_ids_resource, "GET", get__backfill_ids,
{
method_get.VERIFY_ORIGIN
}
};