mirror of
https://github.com/matrix-construct/construct
synced 2024-09-12 03:29:15 +02:00
251 lines
4.7 KiB
C++
251 lines
4.7 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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struct pagination_tokens
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{
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uint8_t limit;
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char dir;
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m::event::id::buf from;
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m::event::id::buf to;
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pagination_tokens(const resource::request &);
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};
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static void
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_append(json::stack::array &chunk,
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const m::event &,
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const m::event::idx &);
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conf::item<size_t>
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max_filter_miss
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{
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{ "name", "ircd.client.rooms.messages.max_filter_miss" },
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{ "default", 2048L },
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};
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static 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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"prev_events",
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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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resource::response
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get__messages(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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const pagination_tokens page
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{
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request
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};
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const auto &filter_query
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{
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request.query["filter"]
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};
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const unique_buffer<mutable_buffer> filter_buf
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{
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size(filter_query)
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};
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const json::object &filter_json
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{
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url::decode(filter_buf, filter_query)
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};
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const m::room_event_filter filter
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{
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filter_json.has("filter_json")?
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json::object{filter_json.get("filter_json")}:
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filter_json
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};
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const m::room room
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{
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room_id, page.from
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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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m::room::messages it
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{
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room, page.from, &default_fetch_opts
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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()
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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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// Spec sez the 'from' token is exclusive
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if(it && page.dir == 'b')
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--it;
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else if(it)
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++it;
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m::event::id::buf start, end;
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{
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json::stack::member member{ret, "chunk"};
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json::stack::array chunk{member};
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size_t hit{0}, miss{0};
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for(; it; page.dir == 'b'? --it : ++it)
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{
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const m::event &event{*it};
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if(!visible(event, request.user_id))
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break;
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if(page.to && at<"event_id"_>(event) == page.to)
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{
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if(page.dir != 'b')
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start = at<"event_id"_>(event);
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break;
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}
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if(empty(filter_json) || match(filter, event))
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{
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_append(chunk, event, it.event_idx());
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++hit;
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}
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else ++miss;
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if(hit >= page.limit || miss >= size_t(max_filter_miss))
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{
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if(page.dir == 'b')
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end = at<"event_id"_>(event);
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else
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start = at<"event_id"_>(event);
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break;
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}
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}
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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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json::stack::member
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{
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ret, "end", json::value{end}
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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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{
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json::stack::object object
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{
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chunk
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};
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object.append(event);
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json::stack::object unsigned_
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{
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object, "unsigned"
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};
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json::stack::member
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{
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unsigned_, "age", json::value
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{
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long(m::vm::current_sequence - event_idx)
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}
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};
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}
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// Client-Server 6.3.6 query parameters
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pagination_tokens::pagination_tokens(const resource::request &request)
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try
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:limit
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{
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// The maximum number of events to return. Default: 10.
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// > we limit this to 255 via narrowing cast
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request.query["limit"]?
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uint8_t(lex_cast<ushort>(request.query.at("limit"))):
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uint8_t(10)
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}
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,dir
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{
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// Required. The direction to return events from. One of: ["b", "f"]
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request.query.at("dir").at(0)
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}
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,from
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{
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// Required. The token to start returning events from. This token can be
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// obtained from a prev_batch token returned for each room by the sync
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// API, or from a start or end token returned by a previous request to
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// this endpoint.
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url::decode(from, request.query.at("from"))
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}
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{
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// The token to stop returning events at. This token can be obtained from
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// a prev_batch token returned for each room by the sync endpoint, or from
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// a start or end token returned by a previous request to this endpoint.
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if(!empty(request.query["to"]))
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url::decode(to, request.query.at("to"));
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if(dir != 'b' && dir != 'f')
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throw m::BAD_PAGINATION
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{
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"query parameter 'dir' must be 'b' or 'f'"
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};
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}
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catch(const bad_lex_cast &)
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{
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throw m::BAD_PAGINATION
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{
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"query parameter 'limit' is invalid"
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};
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}
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catch(const m::INVALID_MXID &)
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{
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throw m::BAD_PAGINATION
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{
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"query parameter 'from' or 'to' is not a valid token"
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};
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}
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