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construct/modules/client/keys/query.cc

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// 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.
using namespace ircd;
namespace
{
using user_devices_map = std::map<m::user::id, json::array>;
using host_users_map = std::map<string_view, user_devices_map>;
using query_map = std::map<string_view, m::fed::user::keys::query>;
using failure_map = std::map<string_view, std::exception_ptr, std::less<>>;
using buffer_list = std::vector<unique_buffer<mutable_buffer>>;
}
static host_users_map
parse_user_request(const json::object &device_keys);
static bool
send_request(const string_view &,
const user_devices_map &,
failure_map &,
buffer_list &,
query_map &);
static query_map
send_requests(const host_users_map &,
buffer_list &,
failure_map &);
static void
recv_response(const m::resource::request &,
const string_view &,
m::fed::user::keys::query &,
failure_map &,
json::stack::object &);
static void
recv_responses(const m::resource::request &,
query_map &,
failure_map &,
json::stack::object &,
const milliseconds &);
static void
handle_failures(const failure_map &,
json::stack::object &);
static m::resource::response
post__keys_query(client &client,
const m::resource::request &request);
mapi::header
IRCD_MODULE
{
"Client 14.11.5.2 :Key management API"
};
ircd::m::resource
query_resource
{
"/_matrix/client/r0/keys/query",
{
"(14.11.5.2.2) Keys query",
}
};
m::resource::method
method_post
{
query_resource, "POST", post__keys_query,
{
method_post.REQUIRES_AUTH
}
};
conf::item<milliseconds>
query_timeout_default
{
{ "name", "ircd.client.keys.query.timeout.default" },
{ "default", 10000L },
};
conf::item<milliseconds>
query_timeout_min
{
{ "name", "ircd.client.keys.query.timeout.min" },
{ "default", 5000L },
};
conf::item<milliseconds>
query_timeout_max
{
{ "name", "ircd.client.keys.query.timeout.max" },
{ "default", 20000L },
};
conf::item<size_t>
query_limit
{
{ "name", "ircd.client.keys.query.limit" },
{ "default", 4096L },
};
m::resource::response
post__keys_query(client &client,
const m::resource::request &request)
{
const milliseconds
timeout_min{query_timeout_min},
timeout_max{query_timeout_max},
timeout_default{query_timeout_default},
timeout
{
std::clamp(request.get("timeout", timeout_default), timeout_min, timeout_max)
};
const json::string token
{
request["token"]
};
const m::event::idx since
{
m::sync::sequence(m::sync::make_since(token))
};
const json::object &request_keys
{
request.at("device_keys")
};
const host_users_map map
{
parse_user_request(request_keys)
};
buffer_list buffers;
failure_map failures;
query_map queries
{
send_requests(map, buffers, failures)
};
m::resource::response::chunked response
{
client, http::OK
};
json::stack out
{
response.buf, response.flusher()
};
json::stack::object top
{
out
};
recv_responses(request, queries, failures, top, timeout);
handle_failures(failures, top);
return {};
}
void
handle_failures(const failure_map &failures,
json::stack::object &out)
{
json::stack::object response_failures
{
out, "failures"
};
for(const auto &p : failures)
{
const string_view &hostname(p.first);
const std::exception_ptr &eptr(p.second);
json::stack::member
{
response_failures, hostname, what(eptr)
};
}
}
void
recv_responses(const m::resource::request &client_request,
query_map &queries,
failure_map &failures,
json::stack::object &out,
const milliseconds &timeout)
try
{
const system_point timedout
{
ircd::now<system_point>() + timeout
};
while(!queries.empty())
{
static const auto dereferencer{[]
(auto &it) -> m::fed::user::keys::query &
{
return it->second;
}};
auto next
{
ctx::when_any(begin(queries), end(queries), dereferencer)
};
next.wait_until(timedout); // throws on timeout
const auto it{next.get()};
const unwind remove{[&queries, &it]
{
queries.erase(it);
}};
const auto &remote(it->first);
auto &request(it->second);
assert(!failures.count(remote));
if(failures.count(remote))
continue;
recv_response(client_request, remote, request, failures, out);
}
}
catch(const std::exception &)
{
for(const auto &[remote, request] : queries)
failures.emplace(remote, std::current_exception());
}
void
recv_response(const m::resource::request &client_request,
const string_view &remote,
m::fed::user::keys::query &request,
failure_map &failures,
json::stack::object &out)
try
{
const auto code
{
request.get()
};
const json::object response
{
request
};
// device_keys
{
json::stack::object object
{
out, "device_keys"
};
const json::object &device_keys
{
response["device_keys"]
};
for(const auto &[_user_id, device_keys] : device_keys)
{
const m::user::id &user_id
{
_user_id
};
json::stack::object user_object
{
object, user_id
};
for(const auto &[device_id, keys] : json::object(device_keys))
json::stack::member
{
user_object, device_id, keys
};
}
}
// master_keys
{
json::stack::object object
{
out, "master_keys"
};
const json::object &master_keys
{
response["master_keys"]
};
for(const auto &[_user_id, master_key] : master_keys)
{
const m::user::id &user_id
{
_user_id
};
json::stack::member
{
object, user_id, json::object
{
master_key
}
};
}
}
// self_signing_keys
{
json::stack::object object
{
out, "self_signing_keys"
};
const json::object &self_signing_keys
{
response["self_signing_keys"]
};
for(const auto &[_user_id, self_signing_key] : self_signing_keys)
{
const m::user::id &user_id
{
_user_id
};
json::stack::member
{
object, user_id, json::object
{
self_signing_key
}
};
}
}
// user_signing_keys
{
json::stack::object object
{
out, "user_signing_keys"
};
const json::object &user_signing_keys
{
response["user_signing_keys"]
};
for(const auto &[_user_id, user_signing_key] : user_signing_keys)
{
const m::user::id &user_id
{
_user_id
};
if(client_request.user_id != _user_id)
continue;
json::stack::member
{
object, user_id, json::object
{
user_signing_key
}
};
}
}
}
catch(const std::exception &e)
{
log::error
{
m::log, "user keys query from %s :%s",
remote,
e.what()
};
failures.emplace(remote, std::current_exception());
}
query_map
send_requests(const host_users_map &hosts,
buffer_list &buffers,
failure_map &failures)
{
query_map ret;
for(const auto &pair : hosts)
{
const string_view &remote(pair.first);
const user_devices_map &user_devices(pair.second);
send_request(remote, user_devices, failures, buffers, ret);
}
return ret;
}
bool
send_request(const string_view &remote,
const user_devices_map &queries,
failure_map &failures,
buffer_list &buffers,
query_map &ret)
try
{
static const size_t buffer_unit_size
{
m::user::id::MAX_SIZE + 1 // 256
+ 128 // device_id
};
const size_t buffer_size
{
8_KiB + // headers
buffer_unit_size * std::min(queries.size(), size_t(query_limit))
};
const auto &buffer
{
buffers.emplace_back(buffer_size)
};
m::fed::user::keys::query::opts opts;
opts.remote = remote;
ret.emplace
(
std::piecewise_construct,
std::forward_as_tuple(remote),
std::forward_as_tuple(queries, buffer, std::move(opts))
);
return true;
}
catch(const std::exception &e)
{
log::error
{
m::log, "user keys query to %s :%s",
remote,
e.what()
};
failures.emplace(remote, std::current_exception());
return false;
}
host_users_map
parse_user_request(const json::object &device_keys)
{
host_users_map ret;
for(const auto &member : device_keys)
{
const m::user::id &user_id(member.first);
const json::array &device_ids(member.second);
const string_view &host(user_id.host());
auto it(ret.lower_bound(host));
if(it == end(ret) || it->first != host)
it = ret.emplace_hint(it, host, user_devices_map{});
user_devices_map &users(it->second);
{
auto it(users.lower_bound(user_id));
if(it == end(users) || it->first != user_id)
it = users.emplace_hint(it, user_id, json::array{});
if(!empty(device_ids))
it->second = device_ids;
}
}
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return ret;
}