/// <summary>
/// Checks if password has been compromised using PwnedPasswords API.
/// </summary>
/// <param name="password">Password to check</param>
/// <returns>True if strong password, false if weak password</returns>
public async Task <ResponseDto <bool> > IsPasswordValidAsync(string password)
{
var passwordHash = "";
// Hash password with SHA1.
using (var hasher = new SHA1Cng())
{
passwordHash = BitConverter.ToString(hasher.ComputeHash(Encoding.UTF8.GetBytes(password)));
passwordHash = passwordHash.Replace("-", "");
}
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
// Get first 5 characters of hash and send it as part of the url for a get request.
var prefixHash = passwordHash.Substring(0, 5);
var request = new GetRequestService($"{ApiConstants.PWNED_PASSWORD_URL}{prefixHash}");
var response = await new BackoffRequest(request).TryExecute();
var responseBody = await response.Content.ReadAsStringAsync();
// Separate response by lines into an array of strings
var splitResponse = responseBody.Split(new[] { Environment.NewLine }, StringSplitOptions.None);
// Iterate through every line of response and check if hash matches and, if so, if the count
// falls within valid range.
foreach (var line in splitResponse)
{
// Splits the line by the hash suffix and the breach count.
// An example line would be:
// 1E4C9B93F3F0682250B6CF8331B7EE68FD8:3303003
var splitLine = line.Split(':');
var suffixHash = splitLine[0];
// If password hash does not match, continue to next iteration.
if (!passwordHash.Equals(prefixHash + suffixHash.ToUpper()))
{
continue;
}
var breachCount = int.Parse(splitLine[1]);
var isPasswordValid = true;
// flag password as invalid if the breach count is greater than the limit
if (breachCount > _maxValidCount)
{
isPasswordValid = false;
}
return(new ResponseDto <bool>()
{
Data = isPasswordValid
});
}
// If password has has no matches, it is valid.
return(new ResponseDto <bool>()
{
Data = true
});
}
/// <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>
/// Converts an address into geocoordinates using Google's Geocoding API.
/// </summary>
/// <param name="address">Address to geocode.</param>
/// <returns>Coordinates of address.</returns>
public async Task <ResponseDto <IGeoCoordinates> > GeocodeAsync(IAddress address)
{
try
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
// Retrieve key from configuration and build url for the get request.
var key = ConfigurationManager.AppSettings[GoogleApiConstants.GOOGLE_GEOCODE_API_KEYWORD];
var url = BuildUrl(address, key);
// Send get request and parse the response
var request = new GetRequestService(url);
var response = await new GoogleBackoffRequest(request).TryExecute();
var responseJson = await response.Content.ReadAsStringAsync();
var responseObj = JsonConvert.DeserializeObject <GoogleGeocodingDto>(responseJson);
if (responseObj.status != GoogleApiConstants.GOOGLE_GEOCODE_STATUS_OK)
{
if (responseObj.status == GoogleApiConstants.GOOGLE_GEOCODE_STATUS_ZERO_RESULTS)
{
return(new ResponseDto <IGeoCoordinates>()
{
Error = GoogleApiConstants.GOOGLE_GEOCODE_ERROR_INVALID_ADDRESS
});
}
return(new ResponseDto <IGeoCoordinates>()
{
Error = GoogleApiConstants.GOOGLE_GEOCODE_ERROR_GENERAL
});
}
var result = responseObj.results[0];
foreach (var addresses in responseObj.results[0].address_components)
{
foreach (var type in addresses.types)
{
if (type != GoogleApiConstants.GOOGLE_GEOCODE_TYPE_STREET)
{
continue;
}
var lat = result.geometry.location.lat;
var lng = result.geometry.location.lng;
var geoCoordinates = new GeoCoordinates(lat, lng);
return(new ResponseDto <IGeoCoordinates>()
{
Data = geoCoordinates
});
}
}
return(new ResponseDto <IGeoCoordinates>()
{
Error = GoogleApiConstants.GOOGLE_GEOCODE_ERROR_INVALID_ADDRESS
});
}
catch
{
return(new ResponseDto <IGeoCoordinates>()
{
Error = GoogleApiConstants.GOOGLE_GEOCODE_ERROR_GENERAL
});
}
}