163 lines
3.0 KiB
C++
163 lines
3.0 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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using namespace ircd;
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mapi::header
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IRCD_MODULE
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{
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"federation backfill"
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};
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m::resource
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backfill_resource
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{
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"/_matrix/federation/v1/backfill/",
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{
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"federation backfill",
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resource::DIRECTORY,
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}
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};
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static size_t
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calc_limit(const m::resource::request &request);
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m::resource::response
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get__backfill(client &client,
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const m::resource::request &request);
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m::resource::method
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method_get
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{
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backfill_resource, "GET", get__backfill,
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{
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method_get.VERIFY_ORIGIN
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}
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};
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conf::item<size_t>
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backfill_limit_max
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{
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{ "name", "ircd.federation.backfill.limit.max" },
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{ "default", 16384L },
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};
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conf::item<size_t>
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backfill_limit_default
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{
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{ "name", "ircd.federation.backfill.limit.default" },
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{ "default", 64L },
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};
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conf::item<size_t>
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backfill_flush_hiwat
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{
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{ "name", "ircd.federation.backfill.flush.hiwat" },
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{ "default", 16384L },
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};
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m::resource::response
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get__backfill(client &client,
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const m::resource::request &request)
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{
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if(request.parv.size() < 1)
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throw m::NEED_MORE_PARAMS
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{
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"room_id path parameter required"
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};
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m::room::id::buf room_id
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{
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url::decode(room_id, request.parv[0])
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};
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if(m::room::server_acl::enable_read && !m::room::server_acl::check(room_id, request.node_id))
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throw m::ACCESS_DENIED
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{
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"You are not permitted by the room's server access control list."
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};
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m::event::id::buf event_id
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{
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request.query["v"]?
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url::decode(event_id, request.query.at("v")):
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m::head(room_id)
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};
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const bool ids_only
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{
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request.query.get<bool>("pdu_ids", false)
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};
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const size_t limit
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{
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calc_limit(request)
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};
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m::room::events it
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{
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room_id, event_id
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};
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m::resource::response::chunked response
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{
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client, http::OK
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};
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json::stack out
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{
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response.buf, response.flusher(), size_t(backfill_flush_hiwat)
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};
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json::stack::object top{out};
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json::stack::array pdus
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{
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top, ids_only? "pdu_ids": "pdus"
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};
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size_t count{0};
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m::event::fetch event;
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for(; it && count < limit; ++count, --it)
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{
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if(!seek(std::nothrow, event, it.event_idx()))
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continue;
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assert(event.event_id);
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if(!visible(event, request.node_id))
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continue;
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if(ids_only)
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pdus.append(event.event_id);
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else
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pdus.append(event);
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}
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return response;
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}
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static size_t
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calc_limit(const m::resource::request &request)
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{
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const auto &limit
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{
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request.query["limit"]
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};
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if(!limit)
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return size_t(backfill_limit_default);
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size_t ret
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{
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lex_cast<size_t>(limit)
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};
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return std::min(ret, size_t(backfill_limit_max));
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}
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