public string Sign(ParamUrl requestUrl, OAuthToken authToken)
{
string timestamp = timeStamp();
string nonce = random.Next(0, int.MaxValue).ToString();
string token = (authToken == null)? String.Empty : authToken.Token;
string secret = (authToken == null)? String.Empty : authToken.Secret;
string signature = string.Format("{0}&{1}", consumerSecret, secret);
requestUrl.Add("oauth_consumer_key", consumerKey);
requestUrl.Add("oauth_nonce", nonce);
requestUrl.Add("oauth_timestamp", timestamp);
requestUrl.Add("oauth_signature_method", "PLAINTEXT");
requestUrl.Add("oauth_version", "1.0");
requestUrl.Add("oauth_signature", Uri.EscapeDataString(signature));
if (!String.IsNullOrEmpty(token)) requestUrl.Add("oauth_token", token);
return requestUrl.ToString();
}
private async Task retrieveRequestToken()
{
if (_oAuth == null)
throw new ProviderNotSetupException("Please provide app key and secret first.");
var url = _oAuth.Sign(new ParamUrl(DropboxConfig.RequestTokenUrl), null);
var response = await Http.ResponseToAsync(url).ConfigureAwait(false);
_requestToken = tokenFromResponse(response);
}