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construct/modules/client/rooms/relations.cc

191 lines
4.1 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2019 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;
static void
relations_chunk(client &client,
const m::resource::request &request,
const m::room::id &room_id,
const m::event::id &event_id,
const string_view &rel_type,
const string_view &type,
json::stack::array &chunk);
m::resource::response
get__relations(client &client,
const m::resource::request &request,
const m::room::id &room_id)
{
if(!m::exists(room_id))
throw m::NOT_FOUND
{
"Cannot find relations in %s which is not found.",
string_view{room_id}
};
if(request.parv.size() < 3)
throw m::NEED_MORE_PARAMS
{
"event_id path parameter required"
};
m::event::id::buf event_id
{
url::decode(event_id, request.parv[2])
};
if(!m::exists(event_id))
throw m::NOT_FOUND
{
"Cannot get relations about %s which is not found.",
string_view{event_id}
};
// Get the rel_type path parameter.
// Note: Not requiring path parameter; empty will mean all types.
char rel_type_buf[m::event::TYPE_MAX_SIZE];
if((false) && request.parv.size() < 4)
throw m::NEED_MORE_PARAMS
{
"relation rel_type path parameter required"
};
const string_view &rel_type
{
url::decode(rel_type_buf, request.parv[3])
};
// Get the alleged type path parameter.
// Note: Not requiring this path parameter either; it is not clear yet
// what this parameter actually means.
char type_buf[m::event::TYPE_MAX_SIZE];
if((false) && request.parv.size() < 5)
throw m::NEED_MORE_PARAMS
{
"relation ?type? path parameter required"
};
const string_view &type
{
url::decode(type_buf, request.parv[4])
};
m::resource::response::chunked response
{
client, http::OK
};
json::stack out
{
response.buf, response.flusher()
};
json::stack::object top
{
out
};
json::stack::array chunk
{
top, "chunk"
};
relations_chunk(client, request, room_id, event_id, rel_type, type, chunk);
return std::move(response);
}
void
relations_chunk(client &client,
const m::resource::request &request,
const m::room::id &room_id,
const m::event::id &event_id,
const string_view &rel_type,
const string_view &type,
json::stack::array &chunk)
try
{
const auto append{[&chunk, &request]
(const auto &event_idx, const m::event &event)
{
m::event::append::opts opts;
opts.event_idx = &event_idx;
opts.user_id = &request.user_id;
opts.query_txnid = false;
m::event::append
{
chunk, event, opts
};
}};
m::event::idx event_idx
{
index(std::nothrow, event_id)
};
m::event::fetch event
{
std::nothrow, event_idx
};
const auto each_ref{[&event, &append, &rel_type, &request]
(const m::event::idx &event_idx, const m::dbs::ref &)
{
if(!seek(std::nothrow, event, event_idx))
return true;
const json::object &m_relates_to
{
at<"content"_>(event).get("m.relates_to")
};
const json::string &_rel_type
{
m_relates_to.get("rel_type")
};
if(_rel_type != rel_type)
return true;
if(!visible(event, request.user_id))
return true;
append(event_idx, event);
return true;
}};
if(!event.valid)
return;
if(!visible(event, request.user_id))
return;
// Send the original event
append(event_idx, event);
// Send all the referencees
const m::event::refs refs{event_idx};
refs.for_each(m::dbs::ref::M_RELATES, each_ref);
}
catch(const std::exception &e)
{
log::error
{
m::log, "relations in %s for %s rel_type:%s type:%s by %s :%s",
string_view{room_id},
string_view{event_id},
rel_type,
type,
string_view{request.user_id},
e.what(),
};
}