public EscherMiddleware(Func<IDictionary<string, object>, Task> next, IKeyDb keyDb, EscherConfig escherConfig, Action<string> logger)
{
this.next = next;
this.keyDb = keyDb;
this.escher.Config = escherConfig ?? this.escher.Config;
this.logger = logger ?? (message => Debug.WriteLine(message));
}
public string Compose(string canonicalizedRequest, DateTime dateTime, EscherConfig config)
{
return String.Join("\n", new string[]
{
config.AlgorithmPrefix.ToUpper() + "-HMAC-" + config.HashAlgorithm.ToUpper(),
dateTime.ToEscherLongDate(),
dateTime.ToEscherShortDate() + "/" + config.CredentialScope,
HashHelper.Hash(canonicalizedRequest, config.HashAlgorithm)
});
}
public string Compose(EscherConfig config, string key, DateTime dateTime, string[] headersToSign, string stringToSign, string secret)
{
Array.Sort(headersToSign, StringComparer.Ordinal);
return String.Join(" ", new[]
{
config.AlgorithmPrefix + "-HMAC-" + config.HashAlgorithm.ToUpper(),
string.Format("Credential={0}/{1}/{2},", key, dateTime.ToEscherShortDate(), config.CredentialScope),
string.Format("SignedHeaders={0},", String.Join(";", headersToSign.Select(h => h.ToLower()))),
"Signature=" + SignatureCalculator.Sign(stringToSign, secret, dateTime, config)
});
}
public static string Sign(string stringToSign, string secret, DateTime dateTime, EscherConfig config)
{
var hmac = HashHelper.GetHMacImplementation(config.HashAlgorithm);
hmac.Key = Encoding.UTF8.GetBytes(config.AlgorithmPrefix + secret);
hmac.Key = hmac.ComputeHash(Encoding.UTF8.GetBytes(dateTime.ToEscherShortDate()));
foreach (var credentialScopePart in config.CredentialScope.Split('/'))
{
hmac.Key = hmac.ComputeHash(Encoding.UTF8.GetBytes(credentialScopePart));
}
return HashHelper.ByteArrayToHexaString(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
}
public string Canonicalize(IEscherRequest request, string[] headersToSign, EscherConfig config)
{
headersToSign = headersToSign.Select(h => h.ToLower()).ToArray();
return String.Join("\n", new[]
{
request.Method.ToUpper(),
request.Uri.AbsolutePath,
CanonicalizeQueryString(request.Uri),
}.Concat(CanonicalizeHeaders(request, headersToSign)).Concat(new[]
{
null,
String.Join(";", headersToSign.OrderBy(s => s)),
HashHelper.Hash(request.Body, config.HashAlgorithm)
}));
}
public EscherMiddleware(Func <IDictionary <string, object>, Task> next, IKeyDb keyDb, EscherConfig escherConfig, Action <string> logger)
{
this.next = next;
this.keyDb = keyDb;
this.escher.Config = escherConfig ?? this.escher.Config;
this.logger = logger ?? (message => Debug.WriteLine(message));
}
public EscherMiddleware(Func <IDictionary <string, object>, Task> next, IKeyDb keyDb, EscherConfig escherConfig) : this(next, keyDb, escherConfig, null)
{
}
public EscherMiddleware(Func<IDictionary<string, object>, Task> next, IKeyDb keyDb, EscherConfig escherConfig) : this(next, keyDb, escherConfig, null) { }
