public class FileHelper
    {
        private static HttpClient _httpClient = new HttpClient()
        {
            Timeout = TimeSpan.FromSeconds(5)
        };

        public FileHelper() { }

        public async Task<bool> Download(string url, string path)
        {
            var policyResult = await Policy
               .Handle<TaskCanceledException>()
               .WaitAndRetryAsync(retryCount: 3, sleepDurationProvider: i => TimeSpan.FromMilliseconds(300))
               .ExecuteAndCaptureAsync(async () =>
               {
                   using (var httpResponse = await _httpClient.GetAsync(url).ConfigureAwait(false))
                   {
                       httpResponse.EnsureSuccessStatusCode();
                       return await httpResponse.Content.ReadAsByteArrayAsync().ConfigureAwait(false);
                   }
               }).ConfigureAwait(false);

            if (policyResult.Outcome == OutcomeType.Failure || policyResult.Result == null)
                return false;
            try
            {
                File.WriteAllBytes(path, policyResult.Result);
                return true;
            }
            catch (Exception ex)
            {
                // log error
                return false;
            }
        }

        public bool ExtractTarGz(string fileName, string directory)
        {
            try
            {
                using (var inStream = File.OpenRead(fileName))
                using (var gzipStream = new GZipInputStream(inStream))
                using (var tarArchive = TarArchive.CreateInputTarArchive(gzipStream))
                {
                    tarArchive.ExtractContents(directory);
                }
            }
            catch (Exception ex)
            {
                // log error
                return false;
            }
            return true;
        }

        public IList<string> GetFiles(string path)
        {
            var allFiles = new List<string>();
            try
            {
                var localJsonFiles = Directory.GetFiles(path, "*.json", SearchOption.AllDirectories);
                var localTextFiles = Directory.GetFiles(path, "*.txt", SearchOption.AllDirectories);
                allFiles.AddRange(localJsonFiles);
                allFiles.AddRange(localTextFiles);
            }
            catch (UnauthorizedAccessException ex)
            {
                // log error
            }
            return allFiles;
        }
    }