public HmacSignatureContent Resolve(HmacRequestInfo req)
{
var request = new HmacSignatureContent
{
Method = req.Method,
Uri = urlResolver.Resolve(req),
Nonce = req.Headers.Required(Headers.XNonce),
AppId = req.Headers.Required(Headers.XAppId),
Date = GetDate(req.Headers),
Accepts = string.Join(", ", req.Headers.All(Headers.Accept)),
ContentType = req.Headers.FirstOrDefault(Headers.ContentType),
ContentMd5 = Md5(req.Headers)
};
return(request);
}
public Uri Resolve(HmacRequestInfo msg)
{
string ResolveUrlProtocol()
{
string p = msg.Headers.FirstOrDefault(Headers.XForwardedProto);
if (p != null)
{
return(p);
}
p = msg.Headers.FirstOrDefault(Headers.XForwardedProtocol);
if (p != null)
{
return(p);
}
p = msg.Headers.FirstOrDefault(Headers.XUrlScheme);
if (p != null)
{
return(p);
}
return(!string.IsNullOrWhiteSpace(overrideScheme) ? overrideScheme : msg.Url.Scheme);
}
string url = msg.Headers.FirstOrDefault(Headers.XOriginalUrl);
if (url == null)
{
return(msg.Url);
}
if (Uri.IsWellFormedUriString(url, UriKind.Absolute))
{
return(new Uri(url));
}
string protocol = ResolveUrlProtocol();
string host = string.IsNullOrWhiteSpace(overrideHostname) ? msg.Url.Host : overrideHostname;
return(new Uri($"{protocol}://{host}{url}"));
}
public HmacAuthenticationResult Authenticate(HmacRequestInfo req)
{
string clientSignature = ResolveSignature(req.Headers);
HmacSignatureContent signatureContent = signatureContentResolver.Resolve(req);
dateValidator.Validate(signatureContent.Date);
SecureString secret = GetAppSecret(signatureContent.AppId);
string signatureSrc = signatureContent.ToCanonicalString();
string signature = algorithm.Sign(secret, signatureSrc);
if (signature != clientSignature)
{
throw new HmacAuthenticationException($"Signature mismatch. Signature src: '{signatureSrc}'");
}
return(new HmacAuthenticationResult(signatureContent.AppId));
}