mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 02:32:43 +01:00
149 lines
3 KiB
C++
149 lines
3 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#include "rooms.h"
|
|
|
|
using namespace ircd;
|
|
|
|
struct pagination_tokens
|
|
{
|
|
uint8_t limit;
|
|
char dir;
|
|
m::event::id::buf from;
|
|
m::event::id::buf to;
|
|
|
|
pagination_tokens(const resource::request &);
|
|
};
|
|
|
|
resource::response
|
|
get__messages(client &client,
|
|
const resource::request &request,
|
|
const m::room::id &room_id)
|
|
{
|
|
const pagination_tokens page
|
|
{
|
|
request
|
|
};
|
|
|
|
const string_view &filter
|
|
{
|
|
request.query["filter"]
|
|
};
|
|
|
|
const m::room room
|
|
{
|
|
room_id
|
|
};
|
|
|
|
m::event::id::buf start, end;
|
|
std::vector<json::value> ret;
|
|
ret.reserve(page.limit);
|
|
|
|
m::room::messages it
|
|
{
|
|
room, page.from
|
|
};
|
|
|
|
// Spec sez the 'from' token is exclusive
|
|
if(it && page.dir == 'b')
|
|
--it;
|
|
else if(it)
|
|
++it;
|
|
|
|
for(; it; page.dir == 'b'? --it : ++it)
|
|
{
|
|
const m::event &event{*it};
|
|
if(page.to && at<"event_id"_>(event) == page.to)
|
|
{
|
|
if(page.dir != 'b')
|
|
start = at<"event_id"_>(event);
|
|
|
|
break;
|
|
}
|
|
|
|
ret.emplace_back(event);
|
|
if(ret.size() >= page.limit)
|
|
{
|
|
if(page.dir == 'b')
|
|
end = at<"event_id"_>(event);
|
|
else
|
|
start = at<"event_id"_>(event);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
const json::value chunk
|
|
{
|
|
ret.data(), ret.size()
|
|
};
|
|
|
|
return resource::response
|
|
{
|
|
client, json::members
|
|
{
|
|
{ "start", start },
|
|
{ "end", end },
|
|
{ "chunk", chunk },
|
|
}
|
|
};
|
|
}
|
|
|
|
// Client-Server 6.3.6 query parameters
|
|
pagination_tokens::pagination_tokens(const resource::request &request)
|
|
try
|
|
:limit
|
|
{
|
|
// The maximum number of events to return. Default: 10.
|
|
// > we limit this to 255 via narrowing cast
|
|
request.query["limit"]?
|
|
uint8_t(lex_cast<ushort>(request.query.at("limit"))):
|
|
uint8_t(10)
|
|
}
|
|
,dir
|
|
{
|
|
// Required. The direction to return events from. One of: ["b", "f"]
|
|
request.query.at("dir").at(0)
|
|
}
|
|
,from
|
|
{
|
|
// Required. The token to start returning events from. This token can be
|
|
// obtained from a prev_batch token returned for each room by the sync
|
|
// API, or from a start or end token returned by a previous request to
|
|
// this endpoint.
|
|
url::decode(request.query.at("from"), from)
|
|
}
|
|
{
|
|
// The token to stop returning events at. This token can be obtained from
|
|
// a prev_batch token returned for each room by the sync endpoint, or from
|
|
// a start or end token returned by a previous request to this endpoint.
|
|
if(!empty(request.query["to"]))
|
|
url::decode(request.query.at("to"), to);
|
|
|
|
if(dir != 'b' && dir != 'f')
|
|
throw m::BAD_PAGINATION
|
|
{
|
|
"query parameter 'dir' must be 'b' or 'f'"
|
|
};
|
|
}
|
|
catch(const bad_lex_cast &)
|
|
{
|
|
throw m::BAD_PAGINATION
|
|
{
|
|
"query parameter 'limit' is invalid"
|
|
};
|
|
}
|
|
catch(const m::INVALID_MXID &)
|
|
{
|
|
throw m::BAD_PAGINATION
|
|
{
|
|
"query parameter 'from' or 'to' is not a valid token"
|
|
};
|
|
}
|