static bool VerifySignature(string signature, bool usePrimaryKey, Func <string> stringToSign)
{
if (!SharedKeySignature.HasKey(usePrimaryKey))
{
return(false);
}
else if (signature == SharedKeySignature.GenerateSignature(stringToSign, usePrimaryKey))
{
return(true);
}
return(false);
}
private static bool VerifyRequestAuthorization(string signature, bool usePrimaryKey, bool liteAlgorithm, string method, string uriPath,
RequestHeaders headers, RequestQueryParameters queryParams, string requestDate, string contentLength)
{
if (!SharedKeySignature.HasKey(usePrimaryKey))
{
return(false);
}
else if (signature == GenerateSignature(usePrimaryKey, liteAlgorithm, method, uriPath, headers, queryParams, requestDate, contentLength))
{
return(true);
}
return(false);
}
static string GetCanonicalizedResource(bool liteAlgorithm, string uriPath, RequestQueryParameters queryParams, string accountName)
{
string commonPrefix = "/" + accountName + uriPath;
if (liteAlgorithm)
{
var compParam = queryParams.Value <string>("comp");
return(commonPrefix + (!String.IsNullOrWhiteSpace(compParam) ? "?comp=" + compParam : ""));
}
else
{
if (queryParams.Any())
{
return(commonPrefix + "\n" + String.Join("\n", queryParams
.OrderBy(queryParam => queryParam.Key, StringComparer.OrdinalIgnoreCase)
.Select(queryParam => SharedKeySignature.FormatCanonicalizedValues(queryParam))));
}
return(commonPrefix);
}
}
public static string GenerateSignature(bool usePrimaryKey, bool liteAlgorithm, string method, string uriPath,
RequestHeaders headers, RequestQueryParameters queryParams, string requestDate, string contentLength)
{
// Signature scheme is described at: http://msdn.microsoft.com/en-us/library/azure/dd179428.aspx
// and the SDK implementation is at: https://github.com/Azure/azure-storage-net/tree/master/Lib/ClassLibraryCommon/Auth/Protocol
Func <string> stringToSignFactory = null;
if (liteAlgorithm)
{
stringToSignFactory = () => String.Format("{0}\n{1}\n{2}\n{3}\n{4}\n{5}",
method,
headers.Value("Content-MD5", String.Empty),
headers.Value("Content-Type", String.Empty),
requestDate,
SharedKeySignature.GetCanonicalizedHeaders(headers),
GetCanonicalizedResource(liteAlgorithm, uriPath, queryParams, SharedKeySignature.AccountName));
}
else
{
stringToSignFactory = () => String.Format("{0}\n{1}\n{2}\n{3}\n{4}\n{5}\n{6}\n{7}\n{8}\n{9}\n{10}\n{11}\n{12}\n{13}",
method,
headers.Value("Content-Encoding", String.Empty),
headers.Value("Content-Language", String.Empty),
contentLength,
headers.Value("Content-MD5", String.Empty),
headers.Value("Content-Type", String.Empty),
requestDate,
headers.Value("If-Modified-Since", String.Empty),
headers.Value("If-Match", String.Empty),
headers.Value("If-None-Match", String.Empty),
headers.Value("If-Unmodified-Since", String.Empty),
headers.Value("Range", String.Empty),
SharedKeySignature.GetCanonicalizedHeaders(headers),
GetCanonicalizedResource(liteAlgorithm, uriPath, queryParams, SharedKeySignature.AccountName));
}
return(SharedKeySignature.GenerateSignature(stringToSignFactory, usePrimaryKey));
}
