public static byte[] Base64UrlDecode(this string arg)
{
var copy = (string)arg.Clone();
// 62nd & 63rd chars of encoding
copy = SymbolsToReplace.Aggregate(copy, (current, tuple) => current.Replace(tuple.Item1, tuple.Item2));
// Pad with trailing '='s
switch (copy.Length % 4)
{
case 0:
break; // No pad chars in this case
case 2:
copy += "==";
break; // Two pad chars
case 3:
copy += "=";
break; // One pad char
default:
throw new ArgumentException("Bad or corrupted Base64Url string!");
}
return(Convert.FromBase64String(copy)); // Standard base64 decoder
}
/// <summary>
/// Encode an array by Base64 and convert for Url usage
/// </summary>
/// <param name="arg"></param>
/// <returns></returns>
public static string Base64UrlEncode(this byte[] arg)
{
var copy = Convert.ToBase64String(arg);
// Remove any trailing '='s
copy = copy.TrimEnd('=');
// replace 62nd & 64rd chars of encoding
return(SymbolsToReplace.Aggregate(copy, (current, tuple) => current.Replace(tuple.Item2, tuple.Item1)));
}