mirror of
https://github.com/matrix-construct/construct
synced 2024-08-26 03:15:17 +02:00
176 lines
3.5 KiB
C++
176 lines
3.5 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 (undocumented) :Get missing events."
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};
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resource
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get_missing_events_resource
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{
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"/_matrix/federation/v1/get_missing_events/",
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{
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"Federation (undocumented) missing events handler",
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resource::DIRECTORY,
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}
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};
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static resource::response get__missing_events(client &, const resource::request &);
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resource::method
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method_get
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{
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get_missing_events_resource, "GET", get__missing_events,
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{
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method_get.VERIFY_ORIGIN
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}
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};
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resource::method
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method_post
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{
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get_missing_events_resource, "POST", get__missing_events,
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{
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method_post.VERIFY_ORIGIN
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}
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};
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conf::item<ssize_t>
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max_limit
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{
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{ "name", "ircd.federation.missing_events.max_limit" },
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{ "default", 128L }
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};
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conf::item<size_t>
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flush_hiwat
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{
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{ "name", "ircd.federation.missing_events.flush.hiwat" },
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{ "default", long(16_KiB) },
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};
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resource::response
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get__missing_events(client &client,
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const 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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ssize_t limit
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{
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request["limit"]?
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std::min(lex_cast<ssize_t>(request["limit"]), ssize_t(max_limit)):
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ssize_t(10) // default limit (protocol spec)
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};
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const auto min_depth
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{
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request["min_depth"]?
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lex_cast<uint64_t>(request["min_depth"]):
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0
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};
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const json::array &earliest
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{
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request["earliest_events"]
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};
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const json::array &latest
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{
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request["latest_events"]
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};
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const auto in_earliest{[&earliest](const auto &event_id)
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{
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return end(earliest) != std::find_if(begin(earliest), end(earliest), [&event_id]
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(const auto &event_id_)
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{
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return event_id == unquote(event_id_);
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});
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}};
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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(flush_hiwat)
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};
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json::stack::object top{out};
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json::stack::array events
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{
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top, "events"
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};
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std::deque<std::string> queue;
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const auto add_queue{[&limit, &queue, &in_earliest]
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(const m::event::id &event_id) -> bool
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{
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if(in_earliest(event_id))
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return true;
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if(end(queue) != std::find(begin(queue), end(queue), event_id))
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return true;
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if(--limit < 0)
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return false;
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queue.emplace_back(std::string{event_id});
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return true;
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}};
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for(const auto &event_id : latest)
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add_queue(unquote(event_id));
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m::event::fetch event;
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while(!queue.empty())
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{
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const auto &event_id{queue.front()};
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const unwind pop{[&queue]
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{
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queue.pop_front();
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}};
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if(!seek(event, event_id, std::nothrow))
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continue;
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if(!visible(event, request.node_id))
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continue;
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events.append(event);
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const m::event::prev prev(event);
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for(size_t i(0); i < prev.prev_events_count(); ++i)
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if(!add_queue(prev.prev_event(i)))
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break;
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}
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return std::move(response);
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}
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