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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/tether/persistent_host_scan_cache_impl.h"
#include <memory>
#include <unordered_set>
#include "base/check.h"
#include "base/notreached.h"
#include "base/values.h"
#include "chromeos/ash/components/tether/pref_names.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
namespace ash {
namespace tether {
namespace {
constexpr char kTetherNetworkGuidKey[] = "tether_network_guid";
constexpr char kDeviceNameKey[] = "device_name";
constexpr char kCarrierKey[] = "carrier";
constexpr char kBatteryPercentageKey[] = "battery_percentage";
constexpr char kSignalStrengthKey[] = "signal_strength";
constexpr char kSetupRequiredKey[] = "setup_required";
base::Value::Dict HostScanCacheEntryToDictionary(
const HostScanCacheEntry& entry) {
base::Value::Dict dictionary;
dictionary.Set(kTetherNetworkGuidKey, entry.tether_network_guid);
dictionary.Set(kDeviceNameKey, entry.device_name);
dictionary.Set(kCarrierKey, entry.carrier);
dictionary.Set(kBatteryPercentageKey, entry.battery_percentage);
dictionary.Set(kSignalStrengthKey, entry.signal_strength);
dictionary.Set(kSetupRequiredKey, entry.setup_required);
return dictionary;
}
std::unique_ptr<HostScanCacheEntry> DictionaryToHostScanCacheEntry(
const base::Value::Dict& dictionary) {
HostScanCacheEntry::Builder builder;
const std::string* tether_network_guid =
dictionary.FindString(kTetherNetworkGuidKey);
if (!tether_network_guid || tether_network_guid->empty())
return nullptr;
builder.SetTetherNetworkGuid(*tether_network_guid);
const std::string* device_name = dictionary.FindString(kDeviceNameKey);
if (!device_name)
return nullptr;
builder.SetDeviceName(*device_name);
const std::string* carrier = dictionary.FindString(kCarrierKey);
if (!carrier)
return nullptr;
builder.SetCarrier(*carrier);
std::optional<int> battery_percentage =
dictionary.FindInt(kBatteryPercentageKey);
if (!battery_percentage || *battery_percentage < 0 ||
*battery_percentage > 100) {
return nullptr;
}
builder.SetBatteryPercentage(*battery_percentage);
std::optional<int> signal_strength = dictionary.FindInt(kSignalStrengthKey);
if (!signal_strength || *signal_strength < 0 || *signal_strength > 100) {
return nullptr;
}
builder.SetSignalStrength(*signal_strength);
std::optional<bool> setup_required = dictionary.FindBool(kSetupRequiredKey);
if (!setup_required)
return nullptr;
builder.SetSetupRequired(*setup_required);
return builder.Build();
}
} // namespace
// static
void PersistentHostScanCacheImpl::RegisterPrefs(PrefRegistrySimple* registry) {
registry->RegisterListPref(prefs::kHostScanCache);
}
PersistentHostScanCacheImpl::PersistentHostScanCacheImpl(
PrefService* pref_service)
: pref_service_(pref_service) {}
PersistentHostScanCacheImpl::~PersistentHostScanCacheImpl() = default;
std::unordered_map<std::string, HostScanCacheEntry>
PersistentHostScanCacheImpl::GetStoredCacheEntries() {
const base::Value::List& cache_entry_list =
pref_service_->GetList(prefs::kHostScanCache);
std::unordered_map<std::string, HostScanCacheEntry> entries;
std::unordered_set<std::string> ids_processed_so_far;
for (auto& cache_entry_value : cache_entry_list) {
if (!cache_entry_value.is_dict()) {
// All prefs stored in the ListValue should be valid DictionaryValues.
NOTREACHED();
}
std::unique_ptr<HostScanCacheEntry> entry =
DictionaryToHostScanCacheEntry(cache_entry_value.GetDict());
DCHECK(entry);
std::string tether_network_guid = entry->tether_network_guid;
DCHECK(!tether_network_guid.empty());
// There should never be duplicate entries stored for one Tether network
// GUID.
DCHECK(ids_processed_so_far.find(tether_network_guid) ==
ids_processed_so_far.end());
ids_processed_so_far.insert(tether_network_guid);
entries.emplace(tether_network_guid, *entry);
}
return entries;
}
void PersistentHostScanCacheImpl::SetHostScanResult(
const HostScanCacheEntry& entry) {
std::unordered_map<std::string, HostScanCacheEntry> entries =
GetStoredCacheEntries();
// Erase any existing scan result for this GUID (if none currently exists,
// this is a no-op).
entries.erase(entry.tether_network_guid);
// Add the entry supplied.
entries.emplace(entry.tether_network_guid, entry);
StoreCacheEntriesToPrefs(entries);
}
bool PersistentHostScanCacheImpl::RemoveHostScanResultImpl(
const std::string& tether_network_guid) {
std::unordered_map<std::string, HostScanCacheEntry> entries =
GetStoredCacheEntries();
bool result_was_removed = entries.erase(tether_network_guid);
// Only store the updated entries if a scan result was actually removed.
// Otherwise, nothing has changed and there is no reason to re-write the same
// data.
if (result_was_removed)
StoreCacheEntriesToPrefs(entries);
return result_was_removed;
}
bool PersistentHostScanCacheImpl::ExistsInCache(
const std::string& tether_network_guid) {
std::unordered_map<std::string, HostScanCacheEntry> entries =
GetStoredCacheEntries();
return entries.find(tether_network_guid) != entries.end();
}
std::unordered_set<std::string>
PersistentHostScanCacheImpl::GetTetherGuidsInCache() {
std::unordered_set<std::string> tether_guids;
for (const auto& entry : GetStoredCacheEntries())
tether_guids.insert(entry.first);
return tether_guids;
}
bool PersistentHostScanCacheImpl::DoesHostRequireSetup(
const std::string& tether_network_guid) {
std::unordered_map<std::string, HostScanCacheEntry> entries =
GetStoredCacheEntries();
auto it = entries.find(tether_network_guid);
DCHECK(it != entries.end());
return it->second.setup_required;
}
void PersistentHostScanCacheImpl::StoreCacheEntriesToPrefs(
const std::unordered_map<std::string, HostScanCacheEntry>& entries) {
base::Value::List entries_list;
for (const auto& it : entries) {
entries_list.Append(base::Value(HostScanCacheEntryToDictionary(it.second)));
}
pref_service_->SetList(prefs::kHostScanCache, std::move(entries_list));
}
} // namespace tether
} // namespace ash
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