private string BuildUrl(IGeoCoordinates coordinates, string key, int timestamp)
{
var url = GoogleApiConstants.GOOGLE_TIMEZONE_URL;
url += $"{GoogleApiConstants.GOOGLE_TIMEZONE_LOCATION_QUERY}{coordinates.Latitude},{coordinates.Longitude}";
url += GoogleApiConstants.GOOGLE_TIMEZONE_TIMESTAMP_QUERY + timestamp;
url += GoogleApiConstants.GOOGLE_KEY_QUERY + key;
return(url);
}
/// <summary>
/// Calculates offset from UTC from geocoordinates using Google's Timezone API.
/// </summary>
/// <param name="coordinates">Coordinates of location to check time zone.</param>
/// <returns>Offset of time (in seconds) from UTC.</returns>
public async Task <ResponseDto <int> > GetOffsetAsync(IGeoCoordinates coordinates)
{
// Get current date in seconds to determine if its DST for Google's API.
var baseTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Local);
var timeStamp = (int)DateTime.Now.Subtract(baseTime).TotalSeconds;
// Retrieve key from configuration and build url for get request.
var key = ConfigurationManager.AppSettings[GoogleApiConstants.GOOGLE_TIMEZONE_API_KEYWORD];
var url = BuildUrl(coordinates, key, timeStamp);
// Send get request and parse response
var request = new GetRequestService(url);
var response = await new GoogleBackoffRequest(request).TryExecute();
var responseJson = await response.Content.ReadAsStringAsync();
var responseObj = JsonConvert.DeserializeObject <GoogleTimeZoneDto>(responseJson);
if (responseObj.status != GoogleApiConstants.GOOGLE_GEOCODE_STATUS_OK)
{
if (responseObj.status == GoogleApiConstants.GOOGLE_TIMEZONE_STATUS_ZERO_RESULTS)
{
return(new ResponseDto <int>()
{
Error = GoogleApiConstants.GOOGLE_TIMEZONE_ERROR_INVALID_ADDRESS
});
}
return(new ResponseDto <int>()
{
Error = GoogleApiConstants.GOOGLE_TIMEZONE_ERROR_GENERAL
});
}
return(new ResponseDto <int>()
{
Data = responseObj.rawOffset + responseObj.dstOffset
});
}
/// <summary>
/// Calculates offset from UTC from geocoordinates using Google's Timezone API.
/// This is a synchronous method wrapped around GetOffsetAsync()
/// </summary>
/// <param name="coordinates">Coordinates of location to check time zone.</param>
/// <returns>Offset of time (in seconds) from UTC</returns>
public ResponseDto <int> GetOffset(IGeoCoordinates coordinates)
{
var result = Task.Run(() => GetOffsetAsync(coordinates)).Result;
return(result);
}
