async Task <SignOperationResult?> TrySigningOnceAsync(IKey key, bool isFirstPass, CancellationToken cancellationToken)
{
int challengesTried = 0;
foreach (var request in requests)
{
if (IsBlacklisted(request))
{
continue;
}
challengesTried += 1;
var requestSignResult = await TrySignOneRequest(key, isFirstPass, request, cancellationToken);
if (requestSignResult.HasValue)
{
return(requestSignResult.Value);
}
}
if (challengesTried == 0)
{
return(SignOperationResult.Failure(KeyResponseStatus.Failure));
}
return(null);
}
async Task <SignOperationResult?> TrySignOneRequest(IKey key, bool isFirstPass, KeySignRequest request,
CancellationToken cancellationToken)
{
try
{
var result = await key.SignAsync(request, cancellationToken, isFirstPass);
log.Info(result.Status.ToString());
switch (result.Status)
{
case KeyResponseStatus.BadKeyHandle:
// No use retrying
blacklistedKeyHandles.Add(request.KeyHandle);
break;
case KeyResponseStatus.Success:
return(SignOperationResult.Success(request, result.Data));
}
}
catch (KeyGoneException)
{
// No sense in continuing with this signer, the key isn't physically present anymore
log.DebugFormat("Key '{0}' is gone", keyId);
throw;
}
catch (TaskCanceledException)
{
// Let cancellation bubble up
throw;
}
catch (KeyBusyException)
{
// Maybe it won't be busy later
}
catch (Exception exception)
{
log.Error("Authenticate request failed", exception);
}
return(null);
}