mirror of
https://github.com/matrix-construct/construct
synced 2024-10-31 02:48:58 +01:00
238 lines
4.3 KiB
C++
238 lines
4.3 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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#include "rooms.h"
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using namespace ircd;
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const size_t
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default_limit
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{
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// 11.20.1.1 - The maximum number of events to return. Default: 10.
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10
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};
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conf::item<size_t>
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limit_max
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{
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{ "name", "ircd.client.rooms.context.limit.max" },
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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.client.rooms.context.flush.hiwat" },
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{ "default", 16384L },
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};
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const m::event::fetch::opts
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default_fetch_opts
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{
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m::event::keys::include
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{
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"content",
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"depth",
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"event_id",
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"origin_server_ts",
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"redacts",
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"room_id",
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"sender",
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"state_key",
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"type",
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},
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};
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static void
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_append(json::stack::array &,
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const m::event &,
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const m::event::idx &,
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const m::user::room &,
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const bool &query_txnid = true);
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resource::response
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get__context(client &client,
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const resource::request &request,
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const m::room::id &room_id)
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{
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if(request.parv.size() < 3)
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throw m::NEED_MORE_PARAMS
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{
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"event_id path parameter required"
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};
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m::event::id::buf event_id
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{
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m::sigil(request.parv[2]) == m::id::EVENT?
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url::decode(event_id, request.parv[2]):
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m::head(room_id)
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};
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const auto limit{[&request]
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{
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auto ret(request.query.get<size_t>("limit", default_limit));
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return std::min(ret, size_t(limit_max));
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}()};
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const m::room room
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{
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room_id, event_id
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};
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if(!room.visible(request.user_id))
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throw m::ACCESS_DENIED
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{
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"You are not permitted to view the room at this event"
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};
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const m::event::fetch event
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{
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event_id
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};
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const m::user::room &user_room
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{
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request.user_id
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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 ret
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{
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out
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};
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json::stack::member
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{
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ret, "event", event
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};
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m::event::id::buf start{event_id};
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{
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json::stack::member member{ret, "events_before"};
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json::stack::array array{member};
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m::room::messages before
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{
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room, event_id, &default_fetch_opts
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};
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if(before)
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--before;
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for(size_t i(0); i < limit && before; --before, ++i)
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{
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const m::event &event{*before};
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start = at<"event_id"_>(event);
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if(!visible(event, request.user_id))
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continue;
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_append(array, event, before.event_idx(), user_room);
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}
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if(before && limit > 0)
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--before;
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if(before)
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start = before.event_id();
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else
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start = {};
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}
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json::stack::member
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{
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ret, "start", json::value{start}
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};
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m::event::id::buf end{event_id};
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{
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json::stack::member member{ret, "events_after"};
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json::stack::array array{member};
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m::room::messages after
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{
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room, event_id, &default_fetch_opts
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};
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if(after)
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++after;
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for(size_t i(0); i < limit && after; ++after, ++i)
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{
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const m::event &event{*after};
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end = at<"event_id"_>(event);
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if(!visible(event, request.user_id))
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continue;
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_append(array, event, after.event_idx(), user_room);
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}
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if(after && limit > 0)
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++after;
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if(after)
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end = after.event_id();
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else
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end = {};
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}
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json::stack::member
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{
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ret, "end", json::value{end}
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};
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{
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json::stack::member member{ret, "state"};
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json::stack::array array{member};
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const m::room::state state
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{
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room, &default_fetch_opts
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};
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state.for_each([&array, &request, &user_room]
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(const m::event::idx &event_idx)
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{
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const m::event::fetch event
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{
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event_idx, std::nothrow
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};
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if(!event.valid)
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return;
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if(!visible(event, request.user_id))
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return;
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_append(array, event, event_idx, user_room, false);
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});
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}
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return {};
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}
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void
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_append(json::stack::array &chunk,
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const m::event &event,
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const m::event::idx &event_idx,
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const m::user::room &user_room,
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const bool &query_txnid)
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{
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m::event_append_opts opts;
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opts.event_idx = &event_idx;
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opts.user_id = &user_room.user.user_id;
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opts.user_room = &user_room;
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m::append(chunk, event, opts);
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}
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