src/app/clusters/time-synchronization-server/DefaultTimeSyncDelegate.cpp

/*
 *
 *    Copyright (c) 2023 Project CHIP Authors
 *    All rights reserved.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include "DefaultTimeSyncDelegate.h"
#include "inet/IPAddress.h"
#include <platform/RuntimeOptionsProvider.h>
#include <system/SystemClock.h>

using chip::TimeSyncDataProvider;
using namespace chip::app::Clusters::TimeSynchronization;

bool DefaultTimeSyncDelegate::IsNTPAddressValid(chip::CharSpan ntp)
{
    // placeholder implementation
    chip::Inet::IPAddress addr;
    return chip::Inet::IPAddress::FromString(ntp.data(), ntp.size(), addr) && addr.IsIPv6();
}

bool DefaultTimeSyncDelegate::IsNTPAddressDomain(chip::CharSpan ntp)
{
    // For now, assume anything that includes a . is a domain name.
    // Delegates are free to evaluate this properly if they actually HAVE domain
    // name resolution, rather than just implementing a dummy for testing.
    return !IsNTPAddressValid(ntp) && (memchr(ntp.data(), '.', ntp.size()) != nullptr);
}

CHIP_ERROR DefaultTimeSyncDelegate::UpdateTimeFromPlatformSource(chip::Callback::Callback<OnTimeSyncCompletion> * callback)
{
    System::Clock::Microseconds64 utcTime;
    if (chip::app::RuntimeOptionsProvider::Instance().GetSimulateNoInternalTime())
    {
        return CHIP_ERROR_NOT_IMPLEMENTED;
    }
    if (System::SystemClock().GetClock_RealTime(utcTime) == CHIP_NO_ERROR)
    {
        // Default assumes the time came from NTP. Platforms using other sources should overwrite this
        // with their own delegates
        // Call the callback right away from within this function
        callback->mCall(callback->mContext, TimeSourceEnum::kMixedNTP, GranularityEnum::kMillisecondsGranularity);
        return CHIP_NO_ERROR;
    }
    return CHIP_ERROR_NOT_IMPLEMENTED;
}