public async Task <Signature> CreateSignature(HttpRequestMessage request, SigningSettings settings, DateTimeOffset timeOfSigning)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
if (settings == null)
{
throw new ArgumentNullException(nameof(settings));
}
_signingSettingsSanitizer.SanitizeHeaderNamesToInclude(settings, request);
settings.Validate();
var nonce = settings.EnableNonce ? _nonceGenerator.GenerateNonce() : null;
var requestForSigning = request.ToRequestForSigning();
var signingString = _signingStringComposer.Compose(
requestForSigning,
settings.SignatureAlgorithm.Name,
settings.Headers,
timeOfSigning,
settings.Expires,
nonce);
var eventTask = settings.Events?.OnSigningStringComposed?.Invoke(request, signingString);
if (eventTask != null)
{
await eventTask;
}
_logger?.LogDebug("Composed the following signing string for request signing: {0}", signingString);
var signatureHash = settings.SignatureAlgorithm.ComputeHash(signingString);
var signatureString = _base64Converter.ToBase64(signatureHash);
_logger?.LogDebug("The base64 hash of the signature string for signing is '{0}'.", signatureString);
var signature = new Signature {
KeyId = settings.KeyId,
Algorithm = $"{settings.SignatureAlgorithm.Name.ToLowerInvariant()}-{settings.SignatureAlgorithm.HashAlgorithm.ToString().ToLowerInvariant()}",
Created = timeOfSigning,
Expires = timeOfSigning.Add(settings.Expires),
Headers = settings.Headers,
Nonce = nonce,
String = signatureString
};
return(signature);
}
public IRequestSigner Create(KeyId keyId, SigningSettings signingSettings)
{
if (keyId == KeyId.Empty)
{
throw new ArgumentException("The specified key id cannot be empty.", nameof(keyId));
}
if (signingSettings == null)
{
throw new ArgumentNullException(nameof(signingSettings));
}
signingSettings.KeyId = keyId;
signingSettings.Validate();
return(new RequestSigner(
_signingSettingsSanitizer,
_signatureCreator,
_authorizationHeaderParamCreator,
signingSettings,
_signatureHeaderEnsurer,
_systemClock,
_logger));
}