mirror of
https://github.com/matrix-construct/construct
synced 2024-12-24 14:34:00 +01:00
311 lines
5.9 KiB
C++
311 lines
5.9 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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/// 11.20.1.1 - The maximum number of events to return. Default: 10.
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const size_t
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default_limit
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{
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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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log::log
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context_log
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{
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"m.context"
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};
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static bool
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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 int64_t &,
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const bool &query_txnid = true);
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m::resource::response
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get__context(client &client,
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const m::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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url::decode(event_id, request.parv[2])
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};
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const auto &limit
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{
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std::min(request.query.get<size_t>("limit", default_limit), 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(!visible(room, 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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// Non-spec param to allow preventing any state from being returned.
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const bool include_state
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{
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request.query.get("state", true)
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};
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// The standard ?filter= is parsed here. m::filter::get() handles
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// whether this is a filter_id and conducts a fetch into this buffer;
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// or inline JSON, and performs URL decoding into this buffer.
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const std::string filter_json
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{
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m::filter::get(request.query["filter"], request.user_id)
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};
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const m::room_event_filter filter
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{
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filter_json
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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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const auto room_depth
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{
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m::depth(std::nothrow, room_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(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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// Output the main event first.
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{
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json::stack::object _event
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{
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ret, "event"
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};
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// We use m::event::append() to modify/add/remove data for this client.
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m::event::append::opts opts;
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opts.event_idx = &event.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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opts.room_depth = &room_depth;
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m::event::append(_event, event, opts);
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}
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// Counters for debug messages
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struct counts
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{
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size_t before {0};
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size_t after {0};
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size_t state {0};
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}
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counts;
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m::event::id::buf start;
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{
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json::stack::array array
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{
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ret, "events_before"
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};
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m::room::events before
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{
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room, event_id
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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 = event.event_id;
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if(!visible(event, request.user_id))
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continue;
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counts.before += _append(array, event, before.event_idx(), user_room, room_depth);
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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 = m::event_id(before.event_idx());
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else
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start = {};
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}
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if(start)
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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;
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{
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json::stack::array array
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{
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ret, "events_after"
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};
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m::room::events after
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{
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room, event_id
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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 = event.event_id;
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if(!visible(event, request.user_id))
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continue;
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counts.after += _append(array, event, after.event_idx(), user_room, room_depth);
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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 = m::event_id(after.event_idx());
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else
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end = {};
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}
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if(end)
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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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if(include_state)
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{
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json::stack::array array
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{
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ret, "state"
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};
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const m::room::state state
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{
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room
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};
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// Setup the event::fetch instance outside of the closure to avoid
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// underlying reconstruction costs for now.
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m::event::fetch event;
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// Iterate the state.
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state.for_each([&]
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(const string_view &type, const string_view &state_key, const m::event::idx &event_idx)
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{
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// Conditions to decide if we should skip this state event based
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// on the lazy-loading spec.
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const bool lazy_loaded
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{
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// The user supplied a filter enabling lazy-loading.
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json::get<"lazy_load_members"_>(filter) &&
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// The type of this state event is a m.room.member type
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type == "m.room.member"
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};
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if(lazy_loaded)
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return true;
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if(!seek(std::nothrow, event, event_idx))
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return true;
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if(!visible(event, request.user_id))
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return true;
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counts.state += _append(array, event, event_idx, user_room, room_depth, false);
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return true;
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});
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}
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log::debug
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{
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context_log, "%s %s in %s before:%zu start:%s after:%zu end:%s state:%zu",
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client.loghead(),
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string_view{event_id},
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string_view{room_id},
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counts.before,
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string_view{start},
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counts.after,
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string_view{end},
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counts.state,
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};
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return std::move(response);
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}
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bool
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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 int64_t &room_depth,
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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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opts.room_depth = &room_depth;
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return m::event::append(chunk, event, opts);
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}
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