/// <summary>
/// The internal method to create signature.
/// </summary>
/// <param name="urlPath"></param>
/// <param name="args"></param>
/// <param name="appSecret"></param>
/// <returns></returns>
private static string InternalGetSignature(string urlPath, IDictionary <string, string> args, string appSecret)
{
string cleartext = urlPath + args.Where((item) => !string.IsNullOrWhiteSpace(item.Value)).Select((item) => item.Key + item.Value).OrderBy((item) => item, StringComparer.Ordinal).StringJoin(string.Empty);
byte[] ciphertext = new HMACSHA1(Encoding.UTF8.GetBytes(appSecret)).ComputeHash(Encoding.UTF8.GetBytes(cleartext));
return(ciphertext.StringJoin(string.Empty, (item) => item.ToString("X2")));
}
