/// <summary>
/// Query the web service for the current IP Address
/// </summary>
/// <returns>An awaitable Task</returns>
public async Task GetCurrentIPAddress()
{
using (var client = new HttpClient { BaseAddress = new Uri("https://api.ipify.org") })
{
await client.GetAsync(string.Empty).ContinueWith(
async responseTask =>
{
if (responseTask.IsCompleted && responseTask.Result.IsSuccessStatusCode)
{
var address = await responseTask.Result.Content.ReadAsStringAsync().ConfigureAwait(false);
var result = new IPAddressResult
{
IPAddress = address,
Checked = DateTime.Now,
Changed = this.History.LastOrDefault()?.IPAddress != address
};
this.history.Add(result);
}
}).ConfigureAwait(false);
}
}
/// <summary>
/// Parse a string as a new <see cref="IPAddressResult"/>
/// </summary>
/// <param name="value">The string to be parsed</param>
/// <returns>A formatted <see cref="IPAddressResult"/> object</returns>
/// <exception cref="ArgumentNullException">Thrown if the supplied value is null or empty</exception>
/// <exception cref="FormatException">Thrown if any of the elements within the value are invalid</exception>
public static IPAddressResult Parse(string value)
{
if (string.IsNullOrEmpty(value))
{
throw new ArgumentNullException(nameof(value), $"A value must be provided for {nameof(value)}");
}
string[] parts = value.Split(new[] { " | " }, StringSplitOptions.RemoveEmptyEntries);
if (parts.Length != 3)
{
throw new FormatException($"The supplied value ('{value}') is not in the expected format");
}
string address = parts[0].Trim();
Regex addressChecker = new Regex(@"((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4}");
if (!addressChecker.IsMatch(address))
{
throw new FormatException("The 'IP Address' element is not a valid IP v4 address");
}
DateTime date;
if (parts[1].Length != 14 || !DateTime.TryParse(parts[1], out date))
{
throw new FormatException("The 'Date Checked' element is not a valid DateTime value");
}
bool changed;
if (parts[2].Length > 5 || parts[2].Length < 4 || !bool.TryParse(parts[2], out changed))
{
throw new FormatException("The 'Changed' element is not a valid value");
}
var result = new IPAddressResult
{
IPAddress = address,
Checked = date,
Changed = changed
};
return result;
}
/// <summary>
/// Attempt to parse a string as a new <see cref="IPAddressResult"/>
/// </summary>
/// <param name="value">The string to be parsed</param>
/// <param name="result">An <see cref="IPAddressResult"/> object to be populated</param>
/// <returns><c>True</c> if the string was parsed successfully; <c>False</c> if not</returns>
public static bool TryParse(string value, out IPAddressResult result)
{
try
{
result = Parse(value);
return true;
}
catch
{
result = null;
return false;
}
}
