public static string TrimEndOfTrailingEquals(this string base64UrlString, PaddingPolicy paddingPolicy = PaddingPolicy.Discard)
{
var output = paddingPolicy == PaddingPolicy.Discard
? base64UrlString.TrimEnd(Characters.Equals)
: base64UrlString;
return(output);
}
public static string Encode(byte[] bytes, PaddingPolicy padding = PaddingPolicy.Discard)
{
var encoded = Convert.ToBase64String(bytes).Replace('+', '-').Replace('/', '_');
if (padding == PaddingPolicy.Discard)
{
encoded = encoded.TrimEnd('=');
}
return(encoded);
}
/// <summary>
/// The following functions perform base64url encoding which differs from regular base64 encoding as follows
/// * padding is skipped so the pad character '=' doesn't have to be percent encoded
/// * the 62nd and 63rd regular base64 encoding characters ('+' and '/') are replace with ('-' and '_')
/// The changes make the encoding alphabet file and URL safe.
/// </summary>
/// <param name="input">bytes to encode.</param>
/// <param name="policy">The padding policy.</param>
/// <returns>Base64Url encoding of the UTF8 bytes.</returns>
public string Encode(byte[] input, PaddingPolicy policy = PaddingPolicy.Discard)
{
var encoded = Convert.ToBase64String(input).Replace(Char62, UrlChar62).Replace(Char63, UrlChar63);
if (policy == PaddingPolicy.Discard)
{
encoded = encoded.TrimEnd(OnePads);
}
return(encoded);
}
/// <summary>
///
/// </summary>
/// <remarks>
/// Source: https://github.com/neosmart/UrlBase64/blob/master/UrlBase64/UrlBase64.cs
/// </remarks>
public static string EncodeBase64Url(string @string, PaddingPolicy paddingPolicy = PaddingPolicy.Discard)
{
var valueBytes = Encoding.UTF8.GetBytes(@string);
var base64String = Convert.ToBase64String(valueBytes);
var base64UrlString = base64String.PerformBase64ToBase64UrlCharacterReplacements();
base64UrlString = base64UrlString.TrimEndOfTrailingEquals(paddingPolicy);
return(base64UrlString);
}