private Tuple <HttpWebRequest, string> PrepareOAuthRequest(string oauthSource, string serverRSAExponent, string serverRSAModulus, string challenge)
{
#if !SILVERLIGHT
var authRequest = (HttpWebRequest)WebRequest.Create(oauthSource);
#else
var authRequest = (HttpWebRequest)WebRequestCreator.ClientHttp.Create(new Uri(oauthSource));
#endif
authRequest.Headers["grant_type"] = "client_credentials";
authRequest.Accept = "application/json;charset=UTF-8";
authRequest.Method = "POST";
if (!string.IsNullOrEmpty(serverRSAExponent) && !string.IsNullOrEmpty(serverRSAModulus) && !string.IsNullOrEmpty(challenge))
{
var parameters = Tuple.Create(OAuthHelper.ParseBytes(serverRSAExponent), OAuthHelper.ParseBytes(serverRSAModulus));
var apiKeyParts = apiKey.Split(new[] { '/' }, StringSplitOptions.None);
if (apiKeyParts.Length > 2)
{
apiKeyParts[1] = string.Join("/", apiKeyParts.Skip(1));
}
if (apiKeyParts.Length < 2)
{
throw new InvalidOperationException("Invalid API key");
}
var apiKeyName = apiKeyParts[0].Trim();
var apiSecret = apiKeyParts[1].Trim();
var data = OAuthHelper.DictionaryToString(new Dictionary <string, string>
{
{ OAuthHelper.Keys.RSAExponent, serverRSAExponent },
{ OAuthHelper.Keys.RSAModulus, serverRSAModulus },
{
OAuthHelper.Keys.EncryptedData,
OAuthHelper.EncryptAssymetric(parameters, OAuthHelper.DictionaryToString(new Dictionary <string, string>
{
{ OAuthHelper.Keys.APIKeyName, apiKeyName },
{ OAuthHelper.Keys.Challenge, challenge },
{
OAuthHelper.Keys.Response,
OAuthHelper.Hash(string.Format(OAuthHelper.Keys.ResponseFormat, challenge, apiSecret))
}
}))
}
});
return(Tuple.Create(authRequest, data));
}
authRequest.ContentLength = 0;
return(Tuple.Create(authRequest, (string)null));
}