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// Copyright 2021 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/policy/test_support/client_storage.h"
#include "base/check.h"
#include "base/containers/contains.h"
#include "crypto/sha2.h"
namespace policy {
ClientStorage::ClientInfo::ClientInfo() = default;
ClientStorage::ClientInfo::ClientInfo(
const ClientStorage::ClientInfo& client_info) = default;
ClientStorage::ClientInfo& ClientStorage::ClientInfo::operator=(
const ClientStorage::ClientInfo& client_info) = default;
ClientStorage::ClientInfo::ClientInfo(ClientStorage::ClientInfo&& client_info) =
default;
ClientStorage::ClientInfo& ClientStorage::ClientInfo::operator=(
ClientStorage::ClientInfo&& client_info) = default;
ClientStorage::ClientInfo::~ClientInfo() = default;
ClientStorage::ClientStorage() = default;
ClientStorage::ClientStorage(ClientStorage&& client_storage) = default;
ClientStorage& ClientStorage::operator=(ClientStorage&& client_storage) =
default;
ClientStorage::~ClientStorage() = default;
void ClientStorage::RegisterClient(const ClientInfo& client_info) {
CHECK(!client_info.device_id.empty());
clients_[client_info.device_id] = client_info;
registered_tokens_[client_info.device_token] = client_info.device_id;
}
bool ClientStorage::HasClient(const std::string& device_id) const {
return clients_.find(device_id) != clients_.end();
}
const ClientStorage::ClientInfo& ClientStorage::GetClient(
const std::string& device_id) const {
const ClientInfo* const client_info = GetClientOrNull(device_id);
CHECK(client_info);
return *client_info;
}
const ClientStorage::ClientInfo* ClientStorage::GetClientOrNull(
const std::string& device_id) const {
auto it = clients_.find(device_id);
return it == clients_.end() ? nullptr : &it->second;
}
const ClientStorage::ClientInfo* ClientStorage::LookupByStateKey(
const std::string& state_key) const {
for (auto const& [device_id, client_info] : clients_) {
if (base::Contains(client_info.state_keys, state_key))
return &client_info;
}
return nullptr;
}
bool ClientStorage::DeleteClient(const std::string& device_token) {
auto it = registered_tokens_.find(device_token);
if (it == registered_tokens_.end())
return false;
const std::string& device_id = it->second;
DCHECK(!device_id.empty());
auto it_clients = clients_.find(device_id);
DCHECK(it_clients != clients_.end());
clients_.erase(it_clients, clients_.end());
registered_tokens_.erase(it, registered_tokens_.end());
return true;
}
size_t ClientStorage::GetNumberOfRegisteredClients() const {
return clients_.size();
}
std::vector<std::string> ClientStorage::GetMatchingStateKeyHashes(
uint64_t modulus,
uint64_t remainder) const {
std::vector<std::string> hashes;
for (const auto& [device_id, client_info] : clients_) {
for (const std::string& key : client_info.state_keys) {
std::string hash = crypto::SHA256HashString(key);
uint64_t hash_remainder = 0;
// Simulate long division in base 256, which allows us to interpret
// individual chars in our hash as digits. We only care about the
// remainder and hence do not compute the quotient in each iteration. This
// assumes big-endian byte order.
for (uint64_t digit : hash)
hash_remainder = (hash_remainder * 256 + digit) % modulus;
if (hash_remainder == remainder)
hashes.push_back(hash);
}
}
return hashes;
}
} // namespace policy
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