public override Task<MessageProtections?> ProcessIncomingMessageAsync(IProtocolMessage message, CancellationToken cancellationToken) {
var authCodeCarrier = message as IAuthorizationCodeCarryingRequest;
if (authCodeCarrier != null) {
var authorizationCodeFormatter = AuthorizationCode.CreateFormatter(this.AuthorizationServer);
var authorizationCode = new AuthorizationCode();
authorizationCodeFormatter.Deserialize(authorizationCode, authCodeCarrier.Code, message, Protocol.code);
authCodeCarrier.AuthorizationDescription = authorizationCode;
}
var refreshTokenCarrier = message as IRefreshTokenCarryingRequest;
if (refreshTokenCarrier != null) {
var refreshTokenFormatter = RefreshToken.CreateFormatter(this.AuthorizationServer.CryptoKeyStore);
var refreshToken = new RefreshToken();
refreshTokenFormatter.Deserialize(refreshToken, refreshTokenCarrier.RefreshToken, message, Protocol.refresh_token);
refreshTokenCarrier.AuthorizationDescription = refreshToken;
}
return MessageProtectionTasks.Null;
}