/// <summary>
/// This method asynchronously reads the construct from the filesystem
/// </summary>
/// <param name="filename"></param>
/// <returns></returns>
public async Task <PublicSuffixDatabase> ReadFromFileAsync(string filename)
{
// Instantiate our stream reader
using StreamReader streamReader = new StreamReader(filename);
// Read the file into memory
string json = await streamReader.ReadToEndAsync();
// Check the content
if (!string.IsNullOrEmpty(json) && !string.IsNullOrWhiteSpace(json))
{
// Deserialize the file
PublicSuffixDatabase fileInstance = JsonConvert.DeserializeObject <PublicSuffixDatabase>(json);
// Set the custom top-level domains into the instance
CustomTopLevelDomains = fileInstance.CustomTopLevelDomains;
// Set the last refreshed timestamp into the instance
LastRefresh = fileInstance.LastRefresh;
// Set the next refresh timestamp into the instance
NextRefresh = fileInstance.NextRefresh;
// Set the top-level domains into the instance
TopLevelDomains = fileInstance.TopLevelDomains;
}
// We're done with the file reader, close it
streamReader.Close();
// We're done, return the instance
return(this);
}
/// <summary>
/// This method asynchronously refreshes the PublicSuffix database
/// </summary>
/// <returns></returns>
public async Task <PublicSuffix> RefreshAsync()
{
// Check the next refresh timestamp to see if we even need to refresh
if (_nextRefresh.HasValue && (_nextRefresh.Value > DateTime.UtcNow))
{
return(this);
}
// Ensure we have a database path
if (string.IsNullOrEmpty(PublicSuffixPath) || string.IsNullOrWhiteSpace(PublicSuffixPath))
{
PublicSuffixPath = Path.GetTempFileName();
}
// Read the database from the file
PublicSuffixDatabase database = await PublicSuffixDatabase.OpenAsync(PublicSuffixPath);
// Check the value of the next refresh
if (database.LastRefresh.HasValue && (database.LastRefresh.Value > DateTime.UtcNow))
{
// Set the custom TLDs into the instance
_customTopLevelDomains.AddRange(database.CustomTopLevelDomains);
// Set the last refreshed timestamp into the instance
_lastRefresh = database.LastRefresh;
// Set the next refresh timestamp into the instance
_nextRefresh = database.NextRefresh;
// Set the top-level domains into the instance
_topLevelDomains.AddRange(database.TopLevelDomains);
// We're done, return the instance
return(this);
}
// Set the last refresh timestamp into the instance
_lastRefresh = DateTime.UtcNow;
// Set the next refresh timestamp into the instance
_nextRefresh = _lastRefresh.Value.AddHours(24);
// Localize our WebClient
using WebClient client = new WebClient();
// Download the Public Suffix database
string publicSuffixDatabase = await client.DownloadStringTaskAsync(new Uri(DatabaseUrl));
// We're done, localize the data and return the instance
Localize(publicSuffixDatabase, null);
// Writeh the datbase to file
await PublicSuffixDatabase.StoreAsync(PublicSuffixPath, this);
// We're done, return the instance
return(this);
}
